IEC 62620:2014

Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary lithium cells and batteries for use in industrial applications

IEC 62620:2014 specifies marking, tests and requirements for lithium secondary cells and batteries used in industrial applications including stationary applications. When there exists an IEC standard specifying test conditions and requirements for cells used in special applications and which is in conflict with this standard, the former takes precedence. (e.g. IEC 62660 series on road vehicles). The following are some examples of applications that utilize the cells and batteries under the scope of this standard.
- Stationary applications: telecom, uninterruptible power supplies (UPS), electrical energy storage system, utility switching, emergency power and similar applications.
- Motive applications: fork-lift truck, golf cart, AGV, railway, and marine, excluding road vehicles.
This standard applies to cells and batteries. If the battery is divided into smaller units, the smaller unit can be tested as the representative of the battery. The manufacturer clearly declares the tested unit. The manufacturer may add functions, which are present in the final battery, to the tested unit.

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Eléments et batteries d'accumulateurs au lithium pour utilisation dans les applications industrielles

L'IEC 62620:2014 spécifie le marquage, les essais et les exigences pour les éléments et les batteries d accumulateurs au lithium utilisés dans les applications industrielles, y compris les applications stationnaires. En cas d'existence d'une norme IEC spécifiant des conditions d'essai et des exigences pour des éléments destinés à des applications particulières, et qui serait en contradiction avec la présente norme, la publication particulière est appliquée en priorité (par exemple, la série IEC 62660 sur les véhicules routiers). Ci-après figurent des exemples d'applications utilisant les éléments et les batteries inclus dans le domaine d'application de la présente norme.
- Applications stationnaires: télécommunications, alimentation sans interruption (ASI), système de stockage de l'énergie électrique, sélecteur de service, alimentation d'urgence et applications analogues.
- Applications mobiles: chariot élévateur, voiturette de golf, AGV, ferroviaire, et marine, à l'exception des véhicules routiers.
La présente norme s'applique aux éléments et aux batteries. Si la batterie est divisée en unités plus petites, l'unité plus petite peut être soumise aux essais pour représenter l'ensemble de la batterie. Le fabricant déclare clairement l'unité soumise aux essais. Le fabricant peut ajouter des fonctions, qui sont présentes dans la batterie finale, à l'unité soumise aux essais.

General Information

• Status: Published
• Publication Date: 11-May-2023
• ICS: 29.220.30 - Alkaline secondary cells and batteries
• Technical Committee: SC 21A - Secondary cells and batteries containing alkaline or other non-acid electrolytes
• Drafting Committee: WG 5 - TC 21/SC 21A/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 25-Nov-2014
• Completion Date: 31-Dec-2014

Relations

• Amended By: IEC 62620:2014/AMD1:2023 - Amendment 1 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary lithium cells and batteries for use in industrial applications
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62620 ®
Edition 1.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary lithium cells and batteries for use in industrial
applications
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Éléments et batteries d'accumulateurs au lithium pour utilisation dans les
applications industrielles
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IEC 62620 ®
Edition 1.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Secondary lithium cells and batteries for use in industrial

applications
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –

Éléments et batteries d'accumulateurs au lithium pour utilisation dans les

applications industrielles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 29.220.30 ISBN 978-2-8322-1958-4

– 2 – IEC 62620:2014 © IEC 2014
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Parameters measurement tolerances . 8
5 Marking and designation . 8
5.1 Marking . 8
5.2 Cell designation . 10
5.3 Battery designation . 12
5.3.1 General . 12
5.3.2 Battery structure formulation . 13
5.4 Cell or battery termination . 13
6 Electrical tests . 13
6.1 General . 13
6.2 Charging procedure for test purposes . 14
6.3 Discharge performance . 14
6.3.1 Discharge performance at +25 °C . 14
6.3.2 Discharge performance at low temperature . 15
6.3.3 High rate permissible current . 15
6.4 Charge (capacity) retention and recovery . 16
6.4.1 General . 16
6.4.2 Test method . 16
6.4.3 Acceptance criterion . 16
6.5 Cell and battery internal resistance . 17
6.5.1 General . 17
6.5.2 Measurement of the internal a.c. resistance . 17
6.5.3 Measurement of the internal d.c. resistance . 17
6.6 Endurance . 18
6.6.1 Endurance in cycles. 18
6.6.2 Endurance in storage at constant voltage (permanent charge life) . 19
7 Type test conditions . 20
7.1 General . 20
7.2 Sample size . 20
7.3 Conditions for type approval . 21
7.3.1 Dimensions . 21
7.3.2 Electrical tests . 22
Annex A (informative) Battery structure information . 23
A.1 Example 1 . 23
A.2 Example 2 . 23
A.3 Example 3 . 23
A.4 Example 4 . 23
A.5 Example 5 . 24
A.6 Example 6 . 24
A.7 Example 7 . 25
A.8 Example 8 . 25

A.9 Example 9 . 26
Bibliography . 27

Figure 1 – Test sequence . 21
Figure A.1 – Structure 3S . 23
Figure A.2 – Structure 2P . 23
Figure A.3 – Structure 3S2P . 23
Figure A.4 – Structure 2P4S . 24
Figure A.5 – Structure 2P4S3P . 24
Figure A.6 – Structure (2P4S)3P . 25
Figure A.7 – Structure (3S2P)3P . 25
Figure A.8 – Structure (5S)4S . 26
Figure A.9 – Structure ((3S2P)3P)2S . 26

Table 1 – Marking . 10
Table 2 – Discharge performance at +25 °C ± 5 °C . 14
Table 3 – Discharge performance at low temperature . 15
Table 4 – Discharge current values for high rate permissible test . 16
Table 5 – Constant discharge current used for measurement of the internal d.c.
resistance . 18
Table 6 – Type test . 20
Table 7 – Severe conditions . 22

– 4 – IEC 62620:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY LITHIUM CELLS AND BATTERIES
FOR USE IN INDUSTRIAL APPLICATIONS

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62620 has been prepared by subcommittee 21A: Secondary cells
and batteries containing alkaline or other non-acid electrolytes, of IEC technical committee 21:
Secondary cells and batteries.
The text of this standard is based on the following documents:
FDIS Report on voting
21A/561/FDIS 21A/572/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 62620:2014 © IEC 2014
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY LITHIUM CELLS AND BATTERIES
FOR USE IN INDUSTRIAL APPLICATIONS

1 Scope
This International Standard specifies marking, tests and requirements for lithium secondary
cells and batteries used in industrial applications including stationary applications.
When there exists an IEC standard specifying test conditions and requirements for cells used
in special applications and which is in conflict with this standard, the former takes precedence.
(e.g. IEC 62660 series on road vehicles).
The following are some examples of applications that utilize the cells and batteries under the
scope of this standard.
• Stationary applications: telecom, uninterruptible power supplies (UPS), electrical energy
storage system, utility switching, emergency power and similar applications.
• Motive applications: fork-lift truck, golf cart, AGV, railway, and marine, excluding road
vehicles.
Since this standard covers batteries for various industrial applications, it includes those
requirements, which are common and minimum to the various applications.
This standard applies to cells and batteries. If the battery is divided into smaller units, the
smaller unit can be tested as the representative of the battery. The manufacturer clearly
declares the tested unit. The manufacturer may add functions, which are present in the final
battery, to the tested unit.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-482:2004, International Electrotechnical Vocabulary (IEV) – Part 482: Primary and
secondary cells and batteries
ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 and
ISO/IEC Guide 51 as well as the following apply.
3.1
charge recovery
capacity recovery
capacity that a cell or battery can deliver after the charge following the charge retention test

Note 1 to entry: Charge retention is defined in 3.2.
3.2
charge retention
capacity retention
capacity that a cell or battery can deliver after storage, at a specific temperature, for a
specific time without subsequent recharge as a percentage of the rated capacity
3.3
final voltage
end-of-discharge voltage
specified closed circuit voltage at which the discharge of a cell or battery is terminated
3.4
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell or a battery
Note 1 to entry: The cell or battery manufacturer may provide the nominal voltage.
Note 2 to entry: The nominal voltage of a battery of n series connected cells is equal to n times the nominal
voltage of a single cell.
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Addition of Notes 1 and 2 to entry.]
3.5
rated capacity
capacity value of a cell or battery determined under specified conditions and declared by the
manufacturer
Note 1 to entry: The rated capacity is the quantity of electricity Cn Ah (ampere-hours) declared by the
manufacturer which a single cell or battery can deliver during a n h period when charging, storing and discharging
under the conditions specified in 6.3.1. n is 5 for an E, M and H discharge rate type cell or battery. n is 8, 10, 20 or
240 for an S discharge rate type battery.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – Addition of Note 1 to entry.]
3.6
cell
secondary lithium cell
secondary cell where electrical energy is derived from the insertion/extraction reactions of
lithium ions or oxidation/reduction reaction of lithium between the negative electrode and the
positive electrode
Note 1 to entry: The cell typically has an electrolyte that consists of a lithium salt and organic solvent compound
in liquid, gel or solid form and has a metal or a laminate film casing. It is not ready for use in an application
because it is not yet fitted with its final housing, terminal arrangement and electronic control device.
3.7
cell block
group of cells connected together in parallel configuration with or without protective devices
(e.g. fuse or PTC) and monitoring circuitry
Note 1 to entry: It is not ready for use in an application because it is not yet fitted with its final housing, terminal
arrangement and electronic control device.
3.8
module
group of cells connected together either in a series and/or parallel configuration with or
without protective devices (e.g. fuse or PTC) and monitoring circuitry

– 8 – IEC 62620:2014 © IEC 2014
3.9
battery pack
energy storage device, which is comprised of one or more cells or modules electrically
connected
Note 1 to entry: It may incorporate a protective housing and be provided with terminals or other interconnection
arrangement. It may include protective devices and control and monitoring, which provides information (e.g. cell
voltage) to a battery system.
3.10
battery system
battery
system which incorporates one or more cells, modules or battery packs; it has a battery
management system
Note 1 to entry: It may have cooling or heating units.
3.11
battery management system
BMS
electronic system associated with a battery which monitors and/or manages its state,
calculates secondary data, reports that data and/or controls its environment to influence the
battery’s safety, performance and/or service life and has the functions to cut off in case of
over charging, over current and over heating
Note 1 to entry: The function of the BMS can be assigned to the battery pack or to equipment that uses the
battery.
Note 2 to entry: A BMS is sometimes also referred to as a BMU (battery management unit).
4 Parameters measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within the following tolerances:
a) ±0,5 % for voltage;
b) ±1 % for current;
c) ±2 °C for temperature;
d) ±0,1 % for time;
e) ±1 % for dimensions.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used, and all other sources of error in the test procedure.
The details of the instrumentation used shall be provided in any report of results.
5 Marking and designation
5.1 Marking
The marking items shown in Table 1 are indicated on the cell, battery system or instruction
manual. When marked on the cell or battery system, each cell or battery system that is
installed or maintained shall carry clear and durable markings giving the information.
The following options are allowed:
• if there are designations on a battery system, designations are not necessary on the
battery pack, module or cell;
• if there are designations on a battery pack, designations are not necessary on the module
and cell;
• if there are designations on a module, designations are not necessary on the cell.
However, for a transportable unit (i.e. a unit that is being shipped), it is necessary to provide
the marking information on the main transportable unit or in its instruction manual.
Furthermore, if there is a marking matter of arrangement between the purchaser and the
manufacturer, it shall comply with the agreement.
See Table 1.
Each cell or battery that is installed or maintained shall carry clear and durable markings
giving the following information:
• secondary (rechargeable) Li or Li-ion;
• polarity (can be deleted if there is an agreement between cell and pack manufacturer);
• date of manufacture (which may be in code);
• name or identification of manufacturer or supplier;
• rated capacity;
• nominal voltage;
• appropriate caution statement.
The model name and manufacturing traceability shall be marked on the cell and battery
surface. The other items listed above can be marked on the smallest package or supplied with
the cell or the battery.
The following information shall be marked on or supplied with the cell or the battery:
• disposal instructions;
• recommended charge instructions.
The following information shall be marked on the cell or when there is no marking place on
the cell, it shall be marked in the manual.
• cell designation as specified in 5.2.

– 10 – IEC 62620:2014 © IEC 2014
Table 1 – Marking
Cell block Battery system
Marking information Cell Module or
Battery pack
Secondary (rechargeable) Li or Li-ion R R R
Polarity (see NOTE 1) R R R
Date of manufacture (which may be in code)* (see NOTE 2) R R R
a
Name or identification of manufacturer or supplier R R R

b
Rated capacity R R R
c
Calculated rated capacity* -- -- R

c
Method for calculating rated capacity* -- -- R
Nominal voltage R R R
Watt-hour* (see NOTE 3) V V V
Appropriate caution statement (Including disposal R R R
instructions）
Cell designation as specified in 5.2 R -- --
Battery designation as specified in 5.4 - R R
Recommended charge instructions R R R
“R” = required;  “V“ = voluntary,  “--“ = unnecessary or not applicable
a It is necessary to mark designations on the main battery system.
b Tested by main battery system; shall be indicated on the main battery system.
c If evaluated by testing the split unit of a battery system; it shall be indicated as the rated capacity and shall be the
amount calculated by a reasonable method.
For example:
Measured rated capacity of module: 10 Ah
Number of modules connected in parallel: 5
Calculated rated capacity (Ah) ＝ 10 Ah × 5 ＝ 50 Ah
NOTE 1 There is an exception, see 5.1.
NOTE 2 The date can be in the form of a code.
NOTE 3 Watt-hour (Wh) designation on cell, module, battery pack or battery system is the rated capacity (Ah) or
c
calculated rated capacity (Ah) as defined in table footnote multiplied by the nominal voltage of the cell, module,
battery pack or battery system according to the following formula:
Watt-hour (Wh) ＝Rated capacity (Ah) or Calculated rated capacity (Ah) × Nominal voltage（V）

5.2 Cell designation
Cells shall be designated with following form:
A A A /N /N /N /A /T T /N
1 2 3 2 3 4 4 L H C
where
A designates the negative electrode basis in which:
I is carbon;
T is titanium;
X is other material.
A designates the positive electrode basis in which:
C is cobalt;
F is iron;
Fp is iron phosphate;
N is nickel;
M is manganese;
Mp is manganese phosphate;
V is vanadium;
X is other material.
A designates the shape of the cell in which:
R is cylindrical;
P is prismatic (including cell with laminate film case).
A designates the rate capability of the cell in which:
E is low rate long-time discharge type;
M is medium rate discharge type;
H is high rate discharge type.
NOTE 1 These types of cells are typically but not exclusively used for the following discharge rates at + 25 °C:
• E up to 0,5 I A,
t
• M up to 3,5 I A,
t
• H up to and above 7,0 I A.
t
NOTE 2 These currents are expressed as multiples of I A, where I A = C Ah/1 h (IEC 61434).
t t 5
T is the low temperature grade defined in 6.3.2. The information shall be indicated by the
L
sign + or – followed by the temperature value in °C (e.g. -30, 0, +10);
T is the high temperature grade defined in 6.6.2. The information shall be indicated by the
H
sign + or – followed by the temperature value in °C (e.g. +40, +50). If a cell is designed
only for cycle application, T should be mentioned as “NA”;
H
N is the percentage (rounded down to every 5 % step) obtained by the ratio of capacity at
C
500 cycles by the rated capacity. Refer to 6.6.1 and 6.3.1. If a cell is designed only for
stand-by application, N should be mentioned as “NA”;
C
N is the maximum diameter (if R) or the maximum thickness (if P) in mm rounded up to the
next whole number;
N is the maximum width (if P) in mm rounded up to the next whole number
(N not shown if R);
N is the maximum overall height in mm rounded up to the next whole number.
NOTE 3 If any dimension is less than 1 mm, the units used are tenths of millimetres and the single number is
written tN such as ”t1” for 0,1 mm.
EXAMPLE 1 ----INR54/222/H/-20+50/70 would designate a cylindrical Li-ion secondary cell, with a nickel-based
positive electrode. Its maximum diameter is between 53 mm and 54 mm, and its overall height is between 221 mm
and 222 mm. It is designed for high discharge rate. Its low temperature grade is -20 °C. Its high temperature grade
is 50 °C. It applies for both cycle and stand-by application. Its capacity retention after 500 cycles to rated capacity
is between 70 % and 74 %.
EXAMPLE 2 ---ICP25/150/150/E/0+60/60 would designate a prismatic Li-ion secondary cell, with a cobalt-based
positive electrode. Its maximum thickness is between 24 mm and 25 mm, its maximum width is between 149 mm
and 150 mm, and its overall height is between 149 mm and 150 mm. It is designed for low discharge rate over a
long period. Its low temperature grade is 0 °C. Its high temperature grade is 60 °C. It applies for both cycle and
stand-by application. Its capacity after 500 cycles to rated capacity is between 60 % and 64 %.
EXAMPLE 3 ---INR50/150/M/-30NA/75 would designate a cylindrical Li-ion secondary cell, with a nickel-based
positive electrode. Its maximum diameter is between 49 mm and 50 mm, and its overall height is between 149 mm
and 150 mm. It is designed for medium discharge rate. Its low temperature grade is -30 °C. Its high temperature
grade is NA. It applies for cycle application only. Its capacity retention after 500 cycles to rated capacity is between
75 % and 79 %.
– 12 – IEC 62620:2014 © IEC 2014
EXAMPLE 4 ---IMP50/240/150/M/-30+10/NA would designate a prismatic Li-ion secondary cell, with a
manganese-based positive electrode. Its maximum thickness is between 49 mm and 50 mm, its maximum width is
between 239 mm and 240 mm, and its overall height is between 149 mm and 150 mm. It is designed for a medium
discharge rate. Its low temperature grade is -30 °C. Its high temperature grade is 10 °C. It applies for stand-by
application only.
5.3 Battery designation
5.3.1 General
Batteries shall be designated with following form:
A A A /N /N /N /[S ]A /T T /N
1 2 3 2 3 4 1 4 L H C
where
A designates the negative electrode basis in which:
I is carbon;
T is titanium;
X is other materials.
A designates the positive electrode basis in which:
C is cobalt;
F is iron;
Fp is iron phosphate
N is nickel;
M is manganese;
Mp is manganese phosphate;
V is vanadium;
X is other materials.
A designates the shape of the cell in which:
R is cylindrical;
P is prismatic (including cell with laminate film case).
A designates the rate capability of the battery in which
S is very low rate long-time discharge type;
E is low rate long-time discharge type;
M is medium rate discharge type;
H is high rate discharge type.
NOTE 1 These types of cells are typically but not exclusively used for the following discharge rates at +25 °C.
• S up to 0,125 I A,
t
• E up to 0,5 I A,
t
• M up to 3,5 I A,
t
• H up to and above 7,0 I A.
t
T is the low temperature grade defined in 6.3.2. The information shall be indicated by
L
the sign + or − followed by the temperature value in °C (e.g. -30, 0, +10);
T is the high temperature grade defined in 6.6.2. The information shall be indicated by the
H
sign + or − followed by the temperature value in °C (e.g. +40, +50). If a battery is
designed only for cycle application, T should be mentioned as “NA”.
H
N is the percentage (rounded down to every 5 % step) obtained by the ratio of capacity at
C
500 cycles by the rated capacity. Refer to 6.6.1 and 6.3.1. If a battery is designed only for
stand-by application, N should be mentioned as “NA”.
C
N is the maximum diameter (if R) or the maximum thickness (if P) in mm rounded up to the
next whole number;
N is the maximum width (if P) in mm rounded up to the next whole number (N not shown
3 3
if R);
N is the maximum overall height in mm rounded up to the next whole number;
NOTE 2 If any dimension is less than 1 mm, the units used are tenths of millimetres and the single number is
written tN such as ”t1” for 0,1 mm.
S is the battery structure formulation shown in 5.3.2.
EXAMPLE 1 ---ICP200/150/150/[7S]E/0+50/75 would designate a battery composed of 7S connected prismatic Li-
ion secondary cells, with a cobalt-based positive electrode. Its cell maximum thickness is between 199 mm and 200
mm, its cell maximum width is between 149 mm and 150 mm, and its cell overall height is between 149 mm and
150 mm. It is designed for low discharge rate over long period. Its low temperature grade is 0 °C. Its high
temperature grade is +50 °C. Its capacity after 500 cycles to rated capacity is between 75 % and 79 %.
EXAMPLE 2 ----INR54/222[4P3S]H/-20+50/80 would designate a battery composed of 4P-3S connected
cylindrical Li-ion secondary cells, with a nickel-based positive electrode. Its cell maximum diameter is between 53
mm and 54 mm, and its cell overall height is between 221 mm and 222 mm. It is designed for high discharge rate.
Its low temperature grade is -20 °C. Its high temperature grade is +50 °C. Its capacity after 500 cycles to rated
capacity is between 80 % and 84 %.
5.3.2 Battery structure formulation
The battery designation should include the breakdown structure of the battery. The descriptive
path followed to formulate the battery is from the smallest entity to the largest one.
a) It describes the number of cells in the minimum constitutive entity and on the right side of
the number describes their connection mode in series (S) or in parallel (P).
See Figures A.1 and A.2.
b) In case that the minimum constitutive entities are connected in series or in parallel, it
describes the number of the minimum constitutive entities, and on the right side of the
number describes their connection mode in series (S) or in parallel (P).
See Figures A.3 and A.4.
c) In case of the larger constitutive entities, it describes the symbols on the right side in the
same way as mentioned above.
When some constitutive entities can be divided for ease of handling or transportation, these
entities can be distinguished from other entities by bracketing.
Some examples are shown in Figure A.5 through Figure A.9.
5.4 Cell or battery termination
This standard does not specify cell or battery termination.
6 Electrical tests
6.1 General
Electrical tests are applied to cells and/or batteries. If the battery is divided in smaller units,
the unit can be tested as the representative of the battery. The manufacturer shall clearly
declare the tested unit. The manufacturer may add, to the tested unit, functions which are
present in the final battery.
The manufacturer can use “cell block(s)” instead of “cell(s)” at any test that specifies “cell(s)”
as the test unit in this document. The cell manufacturer shall clearly declare the test unit for
each test.
– 14 – IEC 62620:2014 © IEC 2014
Charge and discharge currents for the tests shall be based on the value of the rated capacity
(C Ah). These currents are expressed as a multiple of I A, where: I A = C Ah/1 h.
n t t n
C is the rated capacity declared by the manufacturer in ampere hours (Ah), and n is the time
n
base in hours (h) for which the rated capacity is declared. n is 5 for E, M and H discharge rate
type cells or batteries, n is 8, 10, 20 or 240 for S discharge rate type batteries.
See Table 2.
6.2 Charging procedure for test purposes
Prior to charging, the cell or battery shall be discharged at 25 °C ± 5 °C at a constant current
of 1/n I A, down to a specified final voltage.
t
Unless otherwise stated in this standard, cells or batteries shall be charged, in an ambient
temperature of 25 °C ± 5 °C, using the method declared by the manufacturer.
NOTE The final voltage in discharge tests is declared by the manufacturer. All tests are performed with the same
final voltage value. For example, the manufacturer cannot use different final voltage values for discharge
performance tests at 25 °C ± 5 °C, at low temperature, for the endurance tests, etc.
6.3 Discharge performance
6.3.1 Discharge performance at +25 °C
This test verifies the rated capacity of a cell or battery.
Step 1 – The cell or battery shall be fully charged in accordance with 6.2.
Step 2 – The cell or battery shall be stored in an ambient temperature of 25 °C ± 5 °C, for not
less than 1 h and not more than 4 h.
Step 3 – The cell or battery shall then be discharged in the same ambient temperature and as
specified in Table 2 to the final voltage specified by the manufacturer in 6.2.
Step 4 – The capacity (Ah), delivered during step 3, shall not be less than that specified for
this characteristic in Table 2.
Table 2 – Discharge performance at +25 °C ± 5 °C
Discharge conditions Minimum discharge capacity
Rate of Final voltage declared Discharge rate type
constant current by the manufacturer
A V S E M H
(1/n) I Refer to 6.2 100 % Cn Ah
t
a
0,2 I Refer to 6.2 100 % C Ah 100 % C Ah 100 % C Ah
t
5 5 5
1,0 I 95 % C Ah 95 % C Ah
Refer to 6.2 –
t 5 5
b
5,0 I Refer to 6.2 – – 90 % C Ah
t
a
Five cycles are permitted for this test which shall be terminated at the end of the first cycle which meets the
requirement
b
Prior to the 5 I A discharge tests, a conditioning cycle may be included if necessary. This cycle shall consist of

t
charging and discharging in accordance with 6.2.

6.3.2 Discharge performance at low temperature
This test identifies the temperature at which a capacity of not less than 70 % of the rated
capacity can be achieved.
This test verifies the discharge performance at low temperature of the cell or battery. It shall
be measured in accordance with the following steps.
Step 1 – The cell or battery shall be fully charged in accordance with 6.2.
Step 2 – The cell or battery shall be stored for not less than 16 h and not more than 24 h at
an ambient “target” test temperature which is specified by the manufacturer.
Step 3 – The cell or battery shall then be discharged at the same target test temperature and
at the discharge rates specified in Table 3 to the manufacturer’s declared final voltage as
defined in 6.2.
Step 4 – The capacity (Ah), delivered during step 3 shall be not less than that specified for the
cell type and discharge currents in Table 3.
The cell or battery’s low temperature discharge performance can be declared at 10 °C
intervals, such as +10 °C, 0 °C, -10 °C and -20 °C. The declared temperature should be in
the range of the target test temperature and target test temperature plus 10 °C. For example if
the test is performed at -27 °C, the declared temperature should be –20 °C. The temperature
grade is the highest temperature among the tests for discharge rate type M and H. For
example if an “H” type cell has a discharge capacity higher than 70 % of the rated capacity:
at –30 °C with 0,2 I A, at –20 °C, with 1,0 I A and at –10 °C with 5,0 I A, the temperature

t t t
grade is judged as “–10 °C”.
Table 3 – Discharge performance at low temperature
Discharge conditions Minimum discharge capacity
Rate of Final voltage declared
Discharge rate type
constant current by the manufacturer

A V S E M H
(1/n) I 70 % Cn Ah
Refer to 6.2 – – –
t
0,2 It Refer to 6.2 70 % C Ah 70 % C Ah 70 % C Ah
5 5 5
1,0 It Refer to 6.2 – 70 % C Ah 70 % C Ah
5 5
5,0 It Refer to 6.2 – – 70 % C Ah
6.3.3 High rate permissible current
6.3.3.1 General
This test is to evaluate the ability of an “H” or “M” type cell or battery to withstand high
currents.
6.3.3.2 Test method
Step 1 – The cell or battery shall be fully charged in accordance with 6.2.
Step 2 – The cell or battery shall be stored for not less than 1 h and not more than 4 h in an
ambient temperature of 25 °C ± 5 °C.

– 16 – IEC 62620:2014 © IEC 2014
Step 3 – It shall then be discharged for 5 ± 0,1 s at 25 °C ± 5 °C and at the currents specified
in Table 4. During the d
...

IEC 62620 ®
Edition 1.1 2023-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary lithium cells and batteries for use in industrial
applications
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Eléments et batteries d'accumulateurs au lithium pour utilisation dans les
applications industrielles
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IEC 62620 ®
Edition 1.1 2023-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary lithium cells and batteries for use in industrial
applications
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Eléments et batteries d'accumulateurs au lithium pour utilisation dans les
applications industrielles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.30 ISBN 978-2-8322-7030-1

IEC 62620 ®
Edition 1.1 2023-05
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary lithium cells and batteries for use in industrial
applications
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Eléments et batteries d'accumulateurs au lithium pour utilisation dans les
applications industrielles
– 2 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Parameters measurement tolerances . 8
5 Marking and designation . 8
5.1 Marking . 8
5.2 Cell designation . 10
5.3 Battery designation . 12
5.3.1 General . 12
5.3.2 Battery structure formulation . 13
5.4 Cell or battery termination . 13
6 Electrical tests . 13
6.1 General . 13
6.2 Charging procedure for test purposes . 14
6.3 Discharge performance . 14
6.3.1 Discharge performance at +25 °C . 14
6.3.2 Discharge performance at low temperature . 15
6.3.3 High rate permissible current . 15
6.4 Charge (capacity) retention and recovery . 16
6.4.1 General . 16
6.4.2 Test method . 16
6.4.3 Acceptance criterion . 16
6.5 Cell and battery internal resistance . 17
6.5.1 General . 17
6.5.2 Measurement of the internal a.c. resistance . 17
6.5.3 Measurement of the internal d.c. resistance . 17
6.6 Endurance . 18
6.6.1 Endurance in cycles. 18
6.6.2 Endurance in storage at constant voltage (permanent charge life) . 19
7 Type test conditions . 20
7.1 General . 20
7.2 Sample size . 20
7.3 Conditions for type approval . 21
7.3.1 Dimensions . 21
7.3.2 Electrical tests . 22
Annex A (informative) Battery structure information . 23
A.1 Example 1 . 23
A.2 Example 2 . 23
A.3 Example 3 . 23
A.4 Example 4 . 23
A.5 Example 5 . 24
A.6 Example 6 . 24
A.7 Example 7 . 25
A.8 Example 8 . 25
A.9 Example 9 . 26

© IEC 2023
Bibliography . 27

Figure 1 – Test sequence . 21
Figure A.1 – Structure 3S . 23
Figure A.2 – Structure 2P . 23
Figure A.3 – Structure 3S2P . 23
Figure A.4 – Structure 2P4S . 24
Figure A.5 – Structure 2P4S3P . 24
Figure A.6 – Structure (2P4S)3P . 25
Figure A.7 – Structure (3S2P)3P . 25
Figure A.8 – Structure (5S)4S . 26
Figure A.9 – Structure ((3S2P)3P)2S . 26

Table 1 – Marking . 10
Table 2 – Discharge performance at +25 °C ± 5 °C . 14
Table 3 – Discharge performance at low temperature . 15
Table 4 – Discharge current values for high rate permissible test . 16
Table 5 – Constant discharge current used for measurement of the internal d.c.
resistance . 18
Table 6 – Type test . 20
Table 7 – Severe conditions . 22

– 4 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY LITHIUM CELLS AND BATTERIES
FOR USE IN INDUSTRIAL APPLICATIONS

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 62620 edition 1.1 contains the first edition (2014-11) [documents 21A/561/FDIS and
21A/572/RVD] and its amendment 1 (2023-05) [documents 21A/795/CDV and
21A/812/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2023
International Standard IEC 62620 has been prepared by subcommittee 21A: Secondary cells
and batteries containing alkaline or other non-acid electrolytes, of IEC technical committee 21:
Secondary cells and batteries.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site under webstore.iec.ch
in the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY LITHIUM CELLS AND BATTERIES
FOR USE IN INDUSTRIAL APPLICATIONS

1 Scope
This International Standard specifies marking, tests and requirements for lithium secondary
cells and batteries used in industrial applications including stationary applications.
When there exists an IEC standard specifying test conditions and requirements for cells used
in special applications and which is in conflict with this standard, the former takes precedence.
(e.g. IEC 62660 series on road vehicles).
The following are some examples of applications that utilize the cells and batteries under the
scope of this standard.
• Stationary applications: telecom, uninterruptible power supplies (UPS), electrical energy
storage system, utility switching, emergency power and similar applications.
• Motive applications: fork-lift truck, golf cart, AGV, railway, and marine, excluding road
vehicles.
Since this standard covers batteries for various industrial applications, it includes those
requirements, which are common and minimum to the various applications.
This standard applies to cells and batteries. If the battery is divided into smaller units, the
smaller unit can be tested as the representative of the battery. The manufacturer clearly
declares the tested unit. The manufacturer may add functions, which are present in the final
battery, to the tested unit.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-482:2004, International Electrotechnical Vocabulary (IEV) – Part 482: Primary and
secondary cells and batteries
ISO/IEC Guide 51, Safety aspects – Guidelines for their inclusion in standards
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 and
ISO/IEC Guide 51 as well as the following apply.
3.1
charge recovery
capacity recovery
capacity that a cell or battery can deliver after the charge following the charge retention test

© IEC 2023
Note 1 to entry: Charge retention is defined in 3.2.
3.2
charge retention
capacity retention
capacity that a cell or battery can deliver after storage, at a specific temperature, for a
specific time without subsequent recharge as a percentage of the rated capacity
3.3
final voltage
end-of-discharge voltage
specified closed circuit voltage at which the discharge of a cell or battery is terminated
3.4
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell or a battery
Note 1 to entry: The cell or battery manufacturer may provide the nominal voltage.
Note 2 to entry: The nominal voltage of a battery of n series connected cells is equal to n times the nominal
voltage of a single cell.
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Addition of Notes 1 and 2 to entry.]
3.5
rated capacity
capacity value of a cell or battery determined under specified conditions and declared by the
manufacturer
Note 1 to entry: The rated capacity is the quantity of electricity Cn Ah (ampere-hours) declared by the
manufacturer which a single cell or battery can deliver during a n h period when charging, storing and discharging
under the conditions specified in 6.3.1. n is 5 for an E, M and H discharge rate type cell or battery. n is 8, 10, 20 or
240 for an S discharge rate type battery.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – Addition of Note 1 to entry.]
3.6
cell
secondary lithium cell
secondary cell where electrical energy is derived from the insertion/extraction reactions of
lithium ions or oxidation/reduction reaction of lithium between the negative electrode and the
positive electrode
Note 1 to entry: The cell typically has an electrolyte that consists of a lithium salt and organic solvent compound
in liquid, gel or solid form and has a metal or a laminate film casing. It is not ready for use in an application
because it is not yet fitted with its final housing, terminal arrangement and electronic control device.
3.7
cell block
group of cells connected together in parallel configuration with or without protective devices
(e.g. fuse or PTC) and monitoring circuitry
Note 1 to entry: It is not ready for use in an application because it is not yet fitted with its final housing, terminal
arrangement and electronic control device.
3.8
module
group of cells connected together either in a series and/or parallel configuration with or
without protective devices (e.g. fuse or PTC) and monitoring circuitry

– 8 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
3.9
battery pack
energy storage device, which is comprised of one or more cells or modules electrically
connected
Note 1 to entry: It may incorporate a protective housing and be provided with terminals or other interconnection
arrangement. It may include protective devices and control and monitoring, which provides information (e.g. cell
voltage) to a battery system.
3.10
battery system
battery
system which incorporates one or more cells, modules or battery packs; it has a battery
management system
Note 1 to entry: It may have cooling or heating units.
3.11
battery management system
BMS
electronic system associated with a battery which monitors and/or manages its state,
calculates secondary data, reports that data and/or controls its environment to influence the
battery’s safety, performance and/or service life and has the functions to cut off in case of
over charging, over current and over heating
Note 1 to entry: The function of the BMS can be assigned to the battery pack or to equipment that uses the
battery.
Note 2 to entry: A BMS is sometimes also referred to as a BMU (battery management unit).
4 Parameters measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within the following tolerances:
a) ±0,5 % for voltage;
b) ±1 % for current;
c) ±2 °C for temperature;
d) ±0,1 % for time;
e) ±1 % for dimensions.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used, and all other sources of error in the test procedure.
The details of the instrumentation used shall be provided in any report of results.
5 Marking and designation
5.1 Marking
The marking items shown in Table 1 are indicated on the cell, battery system or instruction
manual. When marked on the cell or battery system, each cell or battery system that is
installed or maintained shall carry clear and durable markings giving the information.
The following options are allowed:
• if there are designations on a battery system, designations are not necessary on the
battery pack, module or cell;
© IEC 2023
• if there are designations on a battery pack, designations are not necessary on the module
and cell;
• if there are designations on a module, designations are not necessary on the cell.
However, for a transportable unit (i.e. a unit that is being shipped), it is necessary to provide
the marking information on the main transportable unit or in its instruction manual.
Furthermore, if there is a marking matter of arrangement between the purchaser and the
manufacturer, it shall comply with the agreement.
See Table 1.
Each cell or battery that is installed or maintained shall carry clear and durable markings
giving the following information:
• secondary (rechargeable) Li or Li-ion;
• polarity (can be deleted if there is an agreement between cell and pack manufacturer);
• date of manufacture (which may be in code);
• name or identification of manufacturer or supplier;
• rated capacity;
• nominal voltage;
• appropriate caution statement.
The model name and manufacturing traceability shall be marked on the cell and battery
surface. The other items listed above can be marked on the smallest package or supplied with
the cell or the battery.
The following information shall be marked on or supplied with the cell or the battery:
• disposal instructions;
• recommended charge instructions.
The following information shall be marked on the cell or when there is no marking place on
the cell, it shall be marked in the manual.
• cell designation as specified in 5.2.

– 10 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
Table 1 – Marking
Cell block Battery system
Marking information Cell Module or
Battery pack
Secondary (rechargeable) Li or Li-ion R R R
Polarity (see NOTE 1) R R R
Date of manufacture (which may be in code)* (see NOTE 2) R R R
a
Name or identification of manufacturer or supplier R R R
b
Rated capacity R R R
c
Calculated rated capacity* -- -- R
c
Method for calculating rated capacity* -- -- R
Nominal voltage R R R
Watt-hour* (see NOTE 3) V V V
Appropriate caution statement (Including disposal R R R
instructions）
Cell designation as specified in 5.2 R -- --
Battery designation as specified in 5.4 - R R
Recommended charge instructions R R R
“R” = required;  “V“ = voluntary,  “--“ = unnecessary or not applicable
a It is necessary to mark designations on the main battery system.
b Tested by main battery system; shall be indicated on the main battery system.
c If evaluated by testing the split unit of a battery system; it shall be indicated as the rated capacity and shall be the
amount calculated by a reasonable method.
For example:
Measured rated capacity of module: 10 Ah
Number of modules connected in parallel: 5
Calculated rated capacity (Ah) ＝ 10 Ah × 5 ＝ 50 Ah
NOTE 1 There is an exception, see 5.1.
NOTE 2 The date can be in the form of a code.
NOTE 3 Watt-hour (Wh) designation on cell, module, battery pack or battery system is the rated capacity (Ah) or
c
calculated rated capacity (Ah) as defined in table footnote multiplied by the nominal voltage of the cell, module,
battery pack or battery system according to the following formula:
Watt-hour (Wh) ＝Rated capacity (Ah) or Calculated rated capacity (Ah) × Nominal voltage（V）

5.2 Cell designation
Cells shall be designated with following form:
A A A /N /N /N /A /T T /N
1 2 3 2 3 4 4 L H C
A A A N /N /N /A /T T /N
1 2 3 2 3 4 4 L H C
where
A designates the negative electrode basis in which:
I is carbon;
T is titanium;
X is other material.
© IEC 2023
A designates the positive electrode basis in which:
C is cobalt;
F is iron;
Fp is iron phosphate;
N is nickel;
M is manganese;
Mp is manganese phosphate;
V is vanadium;
X is other material.
A designates the shape of the cell in which:
R is cylindrical;
P is prismatic (including cell with laminate film case).
A designates the rate capability of the cell in which:
E is low rate long-time discharge type;
M is medium rate discharge type;
H is high rate discharge type.
NOTE 1 These types of cells are typically but not exclusively used for the following discharge rates at +25 °C:
• E up to 0,5 I A,
t
• M up to 3,5 I A,
t
• H up to and above 7,0 3,5 I A.
t
NOTE 2 These currents are expressed as multiples of I A, where I A = C Ah/1 h (IEC 61434).
t t 5
T is the low temperature grade defined in 6.3.2. The information shall be indicated by the
L
sign + or – followed by the temperature value in °C (e.g. -30, 0, +10);
T is the high temperature grade defined in 6.6.2. The information shall be indicated by the
H
sign + or – followed by the temperature value in °C (e.g. +40, +50). If a cell is designed
only for cycle application, T should be mentioned as “NA”;
H
N is the percentage (rounded down to every 5 % step) obtained by the ratio of capacity at
C
500 cycles by the rated capacity. Refer to 6.6.1 and 6.3.1. If a cell is designed only for
stand-by application, N should be mentioned as “NA”;
C
N is the maximum diameter (if R) or the maximum thickness (if P) in mm rounded up to the
next whole number;
N is the maximum width (if P) in mm rounded up to the next whole number
(N not shown if R);
N is the maximum overall height in mm rounded up to the next whole number.
NOTE 3 If any dimension is less than 1 mm, the units used are tenths of millimetres and the single number is
written tN such as ”t1” for 0,1 mm.
EXAMPLE 1 ----INR54/222/H/-20+50/70 would designate a cylindrical Li-ion secondary cell, with a nickel-based
positive electrode. Its maximum diameter is between 53 mm and 54 mm, and its overall height is between 221 mm
and 222 mm. It is designed for high discharge rate. Its low temperature grade is -20 °C. Its high temperature grade
is 50 °C. It applies for both cycle and stand-by application. Its capacity retention after 500 cycles to rated capacity
is between 70 % and 74 %.
EXAMPLE 2 ---ICP25/150/150/E/0+60/60 would designate a prismatic Li-ion secondary cell, with a cobalt-based
positive electrode. Its maximum thickness is between 24 mm and 25 mm, its maximum width is between 149 mm
and 150 mm, and its overall height is between 149 mm and 150 mm. It is designed for low discharge rate over a
long period. Its low temperature grade is 0 °C. Its high temperature grade is 60 °C. It applies for both cycle and
stand-by application. Its capacity after 500 cycles to rated capacity is between 60 % and 64 %.
EXAMPLE 3 ---INR50/150/M/-30NA/75 would designate a cylindrical Li-ion secondary cell, with a nickel-based
positive electrode. Its maximum diameter is between 49 mm and 50 mm, and its overall height is between 149 mm
and 150 mm. It is designed for medium discharge rate. Its low temperature grade is -30 °C. Its high temperature
grade is NA. It applies for cycle application only. Its capacity retention after 500 cycles to rated capacity is between
75 % and 79 %.
– 12 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
EXAMPLE 4 ---IMP50/240/150/M/-30+10/NA would designate a prismatic Li-ion secondary cell, with a
manganese-based positive electrode. Its maximum thickness is between 49 mm and 50 mm, its maximum width is
between 239 mm and 240 mm, and its overall height is between 149 mm and 150 mm. It is designed for a medium
discharge rate. Its low temperature grade is -30 °C. Its high temperature grade is 10 °C. It applies for stand-by
application only.
5.3 Battery designation
5.3.1 General
Batteries shall be designated with following form:
A A A /N /N /N /[S ]A /T T /N
1 2 3 2 3 4 1 4 L H C
A A A N /N /N [S ]A /T T /N
1 2 3 2 3 4 1 4 L H C
where
A designates the negative electrode basis in which:
I is carbon;
T is titanium;
X is other materials.
designates the positive electrode basis in which:
A
C is cobalt;
F is iron;
Fp is iron phosphate
N is nickel;
M is manganese;
Mp is manganese phosphate;
V is vanadium;
X is other materials.
A designates the shape of the cell in which:
R is cylindrical;
P is prismatic (including cell with laminate film case).
A designates the rate capability of the battery in which
S is very low rate long-time discharge type;
E is low rate long-time discharge type;
M is medium rate discharge type;
H is high rate discharge type.
NOTE 1 These types of cells are typically but not exclusively used for the following discharge rates at +25 °C.
• S up to 0,125 I A,
t
• E up to 0,5 I A,
t
• M up to 3,5 I A,
t
• H up to and above 7,0 3,5 I A.
t
T is the low temperature grade defined in 6.3.2. The information shall be indicated by
L
the sign + or − followed by the temperature value in °C (e.g. -30, 0, +10);
T is the high temperature grade defined in 6.6.2. The information shall be indicated by the
H
sign + or − followed by the temperature value in °C (e.g. +40, +50). If a battery is
designed only for cycle application, T should be mentioned as “NA”.
H
N is the percentage (rounded down to every 5 % step) obtained by the ratio of capacity at
C
500 cycles by the rated capacity. Refer to 6.6.1 and 6.3.1. If a battery is designed only for
stand-by application, N should be mentioned as “NA”.
C
© IEC 2023
N is the maximum diameter (if R) or the maximum thickness (if P) in mm rounded up to the
next whole number;
N is the maximum width (if P) in mm rounded up to the next whole number (N not shown
3 3
if R);
N is the maximum overall height in mm rounded up to the next whole number;
NOTE 2 If any dimension is less than 1 mm, the units used are tenths of millimetres and the single number is
written tN such as ”t1” for 0,1 mm.
S is the battery structure formulation shown in 5.3.2.
EXAMPLE 1 ---ICP200/150/150/[7S]E/0+50/75 would designate a battery composed of 7S connected prismatic
Li-ion secondary cells, with a cobalt-based positive electrode. Its cell maximum thickness is between 199 mm and
200 mm, its cell maximum width is between 149 mm and 150 mm, and its cell overall height is between 149 mm
and 150 mm. It The battery is designed for low discharge rate over a long period. Its low temperature grade is 0 °C.
Its high temperature grade is +50 °C. Its capacity after 500 cycles to rated capacity is between 75 % and 79 %.
+50/80 would designate a battery composed of 4P-3S connected
EXAMPLE 2 ----INR54/222[4P3S]H/-20
cylindrical Li-ion secondary cells, with a nickel-based positive electrode. Its cell maximum diameter is between 53
mm and 54 mm, and its cell overall height is between 221 mm and 222 mm. It is designed for high discharge rate.
Its low temperature grade is -20 °C. Its high temperature grade is +50 °C. Its capacity after 500 cycles to rated
capacity is between 80 % and 84 %.
5.3.2 Battery structure formulation
The battery designation should include the breakdown structure of the battery. The descriptive
path followed to formulate the battery is from the smallest entity to the largest one.
a) It describes the number of cells in the minimum constitutive entity and on the right side of
the number describes their connection mode in series (S) or in parallel (P).
See Figures A.1 and A.2.
b) In case that the minimum constitutive entities are connected in series or in parallel, it
describes the number of the minimum constitutive entities, and on the right side of the
number describes their connection mode in series (S) or in parallel (P).
See Figures A.3 and A.4.
c) In case of the larger constitutive entities, it describes the symbols on the right side in the
same way as mentioned above.
When some constitutive entities can be divided for ease of handling or transportation, these
entities can be distinguished from other entities by bracketing.
Some examples are shown in Figure A.5 through Figure A.9.
5.4 Cell or battery termination
This standard does not specify cell or battery termination.
6 Electrical tests
6.1 General
Electrical tests are applied to cells and/or batteries. If the battery is divided in smaller units,
the unit can be tested as the representative of the battery. The manufacturer shall clearly
declare the tested unit. The manufacturer may add, to the tested unit, functions which are
present in the final battery.
The manufacturer can use “cell block(s)” instead of “cell(s)” at any test that specifies “cell(s)”
as the test unit in this document. The cell manufacturer shall clearly declare the test unit for
each test.
– 14 – IEC 62620:2014+AMD1:2023 CSV
© IEC 2023
Charge and discharge currents for the tests shall be based on the value of the rated capacity
(C Ah). These currents are expressed as a multiple of I A, where: I A = C Ah/1 h.
n t t n
C is the rated capacity declared by the manufacturer in ampere hours (Ah), and n is the time
n
base in hours (h) for which the rated capacity is declared. n is 5 for E, M and H discharge rate
type cells or batteries, n is 8, 10, 20 or 240 for S discharge rate type batteries.
See Table 2.
6.2 Charging procedure for test purposes
Prior to charging, the cell or battery shall be discharged at 25 °C ± 5 °C at a constant current
of 1/n I A, down to a specified final voltage.
t
Unless otherwise stated in this standard, cells or batteries shall be charged, in an ambient
temperature of 25 °C ± 5 °C, using the method declared by the manufacturer.
NOTE The final voltage in discharge tests is declared by the manufacturer. All tests are performed with the same
final voltage value. For example, the manufacturer cannot use different final voltage values for discharge
performance tests at 25 °C ± 5 °C, at low temperature, for the endurance tests, etc.
6.3 Discharge performance
6.3.1 Discharge performance at +25 °C
This test verifies the rated capacity of a cell or battery.
Step 1 – The cell or battery shall be fully charged in accordance with 6.2.
Step 2 – The cell or battery shall be stored in an ambient temperature of 25 °C ± 5 °C, for not
less than 1 h and not more than 4 h.
Step 3 – The cell or battery shall then be discharged in the same ambient temperature and as
specified in Table 2 to the final voltage specified by the manufacturer in 6.2.
Step 4 – The capacity (Ah), delivered during step 3, shall not be less than that specified for
this characteristic in Table 2.
Table 2 – Discharge performance at +25 °C ± 5 °C
Discharge conditions Minimum discharge capacity
Rate of Final voltage declared Discharge rate type
constant current by the manufacturer
A V S E M H
(1/n) I Refer to 6.2 100 % Cn Ah
t
a
0,2 I Refer to 6.2 100 % C Ah 100 % C Ah 100 % C Ah
t
5 5 5
1,0 I Refer to 6.2 – 95 % C Ah 95 % C Ah
t
5 5
b
5,0 I Refer to 6.2 – – 90 % C Ah
t
a
Five cycles are permitted for this test which shall be terminated at the end of the first cycle which meets the
requirement
b
Prior to the 5 I A discharge tests, a conditioning cycle may be included if necessary. This cycle shall consist of

t
charging and discharging in accordance with 6.2.

© IEC 2023
6.3.2 Discharge performance at low temperature
This test identifies the temperature at which a capacity of not less than 70 % of the rated
capacity can be achieved.
This test verifies the discharge performance at low temperature of the cell or battery. It shall
be measured in accordance with the following steps.
Step 1 – The cell or battery shall be fully charged in accordance with 6.2.
Step 2 – The cell or battery shall be stored for not less than 16 h and not more than 24 h at
an ambient “target” test temperature which is specified by the manufacturer.
Step 3 – The cell or battery shall then be discharged at the same target test temperature and
at the discharge rates specified in Table 3 to the manufacturer’s declared final voltage as
defined in 6.2.
Step 4 – The capacity (Ah), delivered during step 3 shall be not less than that specified for the
cell type and discharge currents in Table 3.
The cell or battery's low temperature discharge performance grade TL can be declared at
10 °C intervals, such as +10 °C, 0 °C, −10 °C and −20 °C. The declared temperature should
be in the range of the target test temperature and target test temperature plus 10 °C. For
example, if the test is performed at −27 °C, the declared temperature should be −20 °C. The
temperature grade is the highest temperature among the tests for discharge rate type M and
H. For example, if an "H" type cell has a discharge capacity higher than 70 % of the rated
A, at −20 °C, with 1,0 I A and at −10 °C with 5,0 I A, the
capacity: at −30 °C with 0,2 I
t t t
temperature grade is judged as "−10 °C".
Table 3 – Discharge performance at low temperature
Discharge conditions Minimum discharge capacity
Rate of Final voltage declared
Discharge rate type
constant current by the manufacturer

A V S E M H
(1/n) I Refer to 6.2 70 % Cn Ah – – –
t
0,2 It Refer to 6.2 70 % C Ah 70 % C Ah 7
...