SIST EN 62660-3:2017

Secondary lithium-ion cells for the propulsion of electrical road vehicles - Part 3: Safety requirements

IEC 62660-3:2016 specifies test procedures and the acceptance criteria for safety performance of secondary lithium-ion cells and cell blocks used for the propulsion of electric vehicles (EV) including battery electric vehicles (BEV) and hybrid electric vehicles (HEV). This International Standard intends to determine the basic safety performance of cells used in a battery pack and system under intended use, and reasonably foreseeable misuse or incident, during the normal operation of the EV. The safety requirements of the cell in this standard are based on the premise that the cells are properly used in a battery pack and system within the limits for voltage, current and temperature as specified by the cell manufacturer (cell operating region). The evaluation of the safety of cells during transport and storage is not covered by this standard.

Lithium-Ionen-Sekundärzellen für den Antrieb von Elektrostraßenfahrzeugen - Teil 3: Sicherheitsanforderungen

Éléments d’accumulateurs lithium-ion pour la propulsion des véhicules routiers électriques - Partie 3: Exigences de sécurité

L'IEC 62660-3:2016 spécifie les procédures d'essai et les critères d'acceptation en matière de performance de sécurité des éléments d'accumulateurs lithium-ion et des blocs d'éléments utilisés pour la propulsion des véhicules électriques (EV), y compris les véhicules électriques à batterie (BEV) et les véhicules électriques hybrides (HEV). La présente Norme internationale a pour objet de déterminer les performances de sécurité de base des éléments utilisés dans un bloc et système de batteries dans les conditions d'utilisation prévue et les utilisations abusives ou incidents raisonnablement prévisibles, pendant le fonctionnement normal de l'EV. Dans la présente norme, les exigences de sécurité de l'élément s'appuient sur l'hypothèse selon laquelle les éléments sont correctement utilisés dans un bloc et système de batteries dans les limites de tension, de courant et de température spécifiées par le fabricant de l'élément (plage de fonctionnement de l'élément). L'évaluation de la sécurité des éléments pendant le transport et le stockage n'est pas couverte par la présente norme.

Sekundarni litij-ionski členi za pogon električnih cestnih vozil - 3. del: Varnostne zahteve

Ta del standarda IEC 62660 določa preskusne postopke in merila sprejemljivosti za varnostne lastnosti sekundarnih litij-ionskih členov in blokov členov, ki se uporabljajo za pogon električnih vozil (EV), vključno z električnimi akumulatorskimi vozili (BEV) ali hibridnimi električnimi vozili (HEV).
OPOMBA 1: Kot alternativa členom se lahko v skladu z dogovorom med proizvajalcem in kupcem uporabijo bloki členov.
OPOMBA 2: V povezavi s členom za hibridna cestna vozila z možnostjo polnjenja prek navadne vtičnice (PHEV) lahko proizvajalec izbere preskuse pogoje za uporabo električnih akumulatorskih vozil ali hibridnih električnih vozil.
Ta mednarodni standard je namenjen za določanje osnovnih varnostnih lastnosti členov v akumulatorju in sistemu v skladu s predvideno uporabo ter pričakovano nepravilno uporabo ali incident pri običajnem delovanju električnih vozil. Varnostne zahteve za člen v tem standardu temeljijo na predpostavki, da se členi pravilno uporabljajo v akumulatorju ter sistemu znotraj napetostnih, tokovnih in temperaturnih omejitev, ki jih določi proizvajalec členov (območje delovanja členov).
Ta standard ne vključuje ocene varnosti za člene med prevozom in skladiščenjem.
OPOMBA 3: Varnostne zahteve glede zmogljivosti litij-ionskih akumulatorjev in sistemov so opredeljene v standardu ISO 12405-3. Specifikacije in varnostne zahteve za litij-ionske akumulatorje ter sisteme električno gnanih mopedov in motornih koles so opredeljena v standardu ISO 18243 (v pripravi). IEC 62619 (v pripravi) zajema varnostne zahteve za litij-ionske člene in akumulatorje za industrijsko uporabo, vključno z viličarji, vozički za golf in avtomatsko vodenimi vozili.
OPOMBA 4: Informacije o območju delovanja členov so podane v dodatku A.

General Information

• Status: Withdrawn
• Publication Date: 28-Mar-2017
• Withdrawal Date: 09-Apr-2025
• ICS: 29.220.99 - Other cells and batteries
• ICS: 43.120 - Electric road vehicles
• Technical Committee: ISCB - Secondary cells and batteries
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 09-Apr-2025
• Due Date: 02-May-2025
• Completion Date: 10-Apr-2025
• Ref Project: EN 62660-3:2016 - Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 3: Safety requirements

Relations

• Replaced By: SIST EN IEC 62660-3:2022 - Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 3: Safety requirements
• Effective Date: 19-Apr-2022
• Revised: SIST EN IEC 62660-3:2022 - Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 3: Safety requirements
• Effective Date: 30-Jun-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2017
6HNXQGDUQLOLWLMLRQVNLþOHQL]DSRJRQHOHNWULþQLKFHVWQLKYR]LOGHO9DUQRVWQH
]DKWHYH
Secondary lithium-ion cells for the propulsion of electrical road vehicles - Part 3: Safety
requirements
Ta slovenski standard je istoveten z: EN 62660-3:2016
ICS:
29.220.99 'UXJLþOHQLLQEDWHULMH Other cells and batteries
43.120 (OHNWULþQDFHVWQDYR]LOD Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62660-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2016
ICS 29.220.20; 43.120
English Version
Secondary lithium-ion cells for the propulsion of electric road
vehicles - Part 3: Safety requirements
(IEC 62660-3:2016)
Éléments d'accumulateurs lithium-ion pour la propulsion Lithium-Ionen-Sekundärzellen für den Antrieb von
des véhicules routiers électriques - Partie 3: Exigences de Elektrostraßenfahrzeugen -
sécurité Teil 3: Sicherheitsanforderungen
(IEC 62660-3:2016) (IEC 62660-3:2016)
This European Standard was approved by CENELEC on 2016-10-03. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 62660-3:2016 E
European foreword
The text of document 21/890/FDIS, future edition 1 of IEC 62660-3, prepared by
IEC/TC 21 "Secondary cells and batteries" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 62660-3:2016.

The following dates are fixed:
(dop) 2017-07-03
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2019-10-03
standards conflicting with the
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 62660-3:2016 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 62133 NOTE Harmonized as EN 62133.
IEC 62660-1 NOTE Harmonized as EN 62660-1.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu
Publication Year Title EN/HD Year

IEC 60050-482 -  International Electrotechnical Vocabulary - -
(IEV) -
Part 482: Primary and secondary cells and
batteries
IEC 61434 -  Secondary cells and batteries containing EN 61434 -
alkaline or other non-acid electrolytes -
Guide to the designation of current in
alkaline secondary cell and battery
standards
Secondary cells and batteries containing
IEC 62619 -  - -
alkaline or other non-acid electrolytes -
Safety requirements for secondary lithium
cells and batteries, for use in industrial
applications
IEC 62660-2 2010 Secondary lithium-ion cells for the EN 62660-2 2011
propulsion of electric road vehicles -
Part 2: Reliability and abuse testing

IEC 62660-3 ®
Edition 1.0 2016-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary lithium-ion cells for the propulsion of electric road vehicles –

Part 3: Safety requirements
Éléments d’accumulateurs lithium-ion pour la propulsion des véhicules routiers

électriques –
Partie 3: Exigences de sécurité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20; 43.120 ISBN 978-2-8322-3576-8

– 2 – IEC 62660-3:2016 © IEC 2016
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references. 7
3 Terms and definitions . 8
4 Test conditions . 9
4.1 General . 9
4.2 Measuring instruments . 9
4.2.1 Range of measuring devices . 9
4.2.2 Voltage measurement . 10
4.2.3 Current measurement. 10
4.2.4 Temperature measurements . 10
4.2.5 Other measurements . 10
4.3 Tolerance. 10
4.4 Test temperature . 11
5 Electrical measurement . 11
5.1 General charge conditions . 11
5.2 Capacity . 11
5.3 SOC adjustment . 11
6 Safety tests . 12
6.1 General . 12
6.2 Mechanical tests . 12
6.2.1 Vibration . 12
6.2.2 Mechanical shock . 12
6.2.3 Crush . 13
6.3 Thermal test . 14
6.3.1 High temperature endurance . 14
6.3.2 Temperature cycling . 14
6.4 Electrical tests . 14
6.4.1 External short circuit . 14
6.4.2 Overcharge . 15
6.4.3 Forced discharge . 15
6.4.4 Internal short circuit test . 15
Annex A (informative) Operating region of cells for safe use . 18
A.1 General . 18
A.2 Charging conditions for safe use. 18
A.2.1 General . 18
A.2.2 Consideration on charging voltage . 18
A.2.3 Consideration on temperature . 19
A.3 Example of operating region . 19
Annex B (informative) Explanation for the internal short-circuit test . 22
B.1 General concept . 22
B.2 Internal short circuit caused by particle contamination . 22
Bibliography . 24

Figure 1 – Example of temperature measurement of cell . 10

IEC 62660-3:2016 © IEC 2016 – 3 –
Figure 2 – Example of crush test . 13
Figure A.1 – An example of operating region for charging of typical lithium-ion cells . 20
Figure A.2 – An example of operating region for discharging of typical lithium-ion cells . 21

Table B.1 – Examples of the internal short circuit of cell . 23

– 4 – IEC 62660-3:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY LITHIUM-ION CELLS FOR THE PROPULSION
OF ELECTRIC ROAD VEHICLES –
Part 3: Safety requirements
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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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.
International Standard IEC 62660-3 has been prepared by IEC technical committee 21:
Secondary cells and batteries.
The text of this standard is based on the following documents:
FDIS Report on voting
21/890/FDIS 21/897/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.

IEC 62660-3:2016 © IEC 2016 – 5 –
A list of all parts in the IEC 62660 series, published under the general title Secondary lithium-
ion cells for the propulsion of electric road vehicles, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website 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.
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 62660-3:2016 © IEC 2016
INTRODUCTION
The electric road vehicles (EV) including hybrid and plug-in hybrid electric vehicles are
beginning to diffuse in the global market with backing from global concerns on CO reduction
and energy, recent advances in technology and cost reduction. This has led to a rapidly
increasing demand for high-power and high-energy density traction batteries represented by
lithium-ion batteries.
For securing a basic level of quality of lithium-ion batteries for automotive applications,
relevant international standards, i.e. IEC 62660-1, IEC 62660-2, ISO 12405-1 and
ISO 12405-2, have been published. These standards specify the performance, reliability and
abuse testing of lithium-ion battery cells, packs and systems for EV applications. Further, in
the light of increasing concerns on the safety of lithium-ion batteries and demand for a
referenceable international standard, safety requirements for lithium-ion battery packs and
systems are defined in ISO 12405-3. Regulations, such as UN ECE R100, are also being
revised that include acceptance criteria for rechargeable energy storage systems of EVs.
It is essential to specify the safety criteria at cell level in this standard, in order to secure the
basic safety level of cells which differ in performance and design, and are applied to a variety
of types of packs and systems. For automobile applications, it is important to note the design
diversity of automobile battery packs and systems, and specific requirements for cells and
batteries corresponding to each of such designs. Based on these facts, the purpose of this
standard is to provide a basic level of safety test methodology and criteria with general
versatility, which serves a function in common primary testing of lithium-ion cells to be used in
a variety of battery systems. Specific requirements for the safety of cells differ depending on
the system designs of battery packs or vehicles, and should be evaluated by the users. Final
pass-fail criteria of cells are to be based on the agreement between the cell manufacturers
and the customers.
IEC 62660-3:2016 © IEC 2016 – 7 –
SECONDARY LITHIUM-ION CELLS FOR THE PROPULSION
OF ELECTRIC ROAD VEHICLES –
Part 3: Safety requirements
1 Scope
This part of IEC 62660 specifies test procedures and the acceptance criteria for safety
performance of secondary lithium-ion cells and cell blocks used for the propulsion of electric
vehicles (EV) including battery electric vehicles (BEV) and hybrid electric vehicles (HEV).
NOTE 1 Cell blocks can be used as an alternative to cells according to the agreement between the manufacturer
and the customer.
NOTE 2 Concerning the cell for plug-in hybrid electric vehicle (PHEV), the manufacturer can select either the test
condition of the BEV application or the HEV application.
This International Standard intends to determine the basic safety performance of cells used in
a battery pack and system under intended use, and reasonably foreseeable misuse or
incident, during the normal operation of the EV. The safety requirements of the cell in this
standard are based on the premise that the cells are properly used in a battery pack and
system within the limits for voltage, current and temperature as specified by the cell
manufacturer (cell operating region).
The evaluation of the safety of cells during transport and storage is not covered by this
standard.
NOTE 3 The safety performance requirements for lithium-ion battery packs and systems are defined in
ISO 12405-3. The specifications and safety requirements for lithium-ion battery packs and systems of electrically
propelled mopeds and motorcycles are defined in ISO 18243 (under development). IEC 62619 (under development)
covers the safety requirements for the lithium ion cells and batteries for industrial applications including forklift
trucks, golf carts, and automated guided vehicles.
NOTE 4 Information on the cell operating region is provided in Annex A.
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, International Electrotechnical Vocabulary – Part 482: Primary and secondary
cells and batteries
IEC 61434, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Guide to the designation of current in alkaline secondary cell and battery standards
IEC 62619:— , Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Safety requirements for secondary lithium cells and batteries, for use in
industrial applications
IEC 62660-2:2010, Secondary lithium-ion cells for the propulsion of electric road vehicles –
Part 2: Reliability and abuse testing
———————
Under preparation. Stage at the time of publication: IEC/CDV 62619:2015

– 8 – IEC 62660-3:2016 © IEC 2016
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in IEC 60050-482, as well
as the following apply.
3.1
battery electric vehicle
BEV
electric vehicle with only a traction battery as power source for vehicle propulsion
3.2
cell block
a group of cells connected together in parallel configuration with or without protective devices,
e.g. fuse or positive temperature coefficient resistor (PTC), not yet fitted with its final housing,
terminal arrangement and electronic control device
3.3
explosion
failure that occurs when a cell container, if any, opens violently and major components are
forcibly expelled
3.4
fire
emission of flames from a cell or cell block
3.5
hybrid electric vehicle
HEV
vehicle with both a rechargeable energy storage system and a fuelled power source for
propulsion
3.6
internal short circuit
unintentional electrical connection between the negative and positive electrodes inside a cell
3.7
leakage
visible escape of liquid electrolyte from a part except vent, such as casing, sealing part and/or
terminals
3.8
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Deletion of "a battery or an
electrochemical system" at the end of the definition.]
3.9
rated capacity
quantity of electricity C Ah (ampere-hours) for BEV and C Ah for HEV declared by the
3 1
manufacturer
3.10
reference test current
I
t
current in amperes which is expressed as
I (A) = C (Ah)/n (h)
t n
IEC 62660-3:2016 © IEC 2016 – 9 –
where
C is the rated capacity of the cell;
n
n in C is the time base (h).
n
3.11
room temperature
temperature of 25 °C ± 2 K
3.12
rupture
mechanical failure of a container case of cell induced by an internal or external cause,
resulting in exposure or spillage but not ejection of materials
3.13
secondary lithium-ion cell
cell
secondary single cell whose electrical energy is derived from the insertion/extraction reactions
of lithium-ions between the anode and the cathode
Note 1 to entry: The secondary cell is a basic manufactured unit providing a source of electrical energy by direct
conversion of chemical energy. The cell consists of electrodes, separators, electrolyte, a container and terminals,
and is designed to be charged electrically.
Note 2 to entry: In this standard, "cell" means the "secondary lithium-ion cell" to be used for the propulsion of
electric road vehicles.
3.14
state of charge
SOC
available capacity in a battery expressed as a percentage of rated capacity
3.15
venting
release of excessive internal pressure from a cell in a manner intended by design to preclude
rupture or explosion
4 Test conditions
4.1 General
The details of the instrumentation used shall be provided in any report of results.
The cell can be tested under restraint to avoid swelling if acceptable according to the purpose
of test. The restraint should refer to the battery design.
4.2 Measuring instruments
4.2.1 Range of measuring devices
The instruments used shall enable the voltage and current values to be measured. The range
of these instruments and measuring methods shall be chosen so as to ensure the accuracy
specified for each test.
For analogue instruments, this implies that the readings shall be taken in the last third of the
graduated scale.
Any other measuring instruments may be used provided they give an equivalent accuracy.

– 10 – IEC 62660-3:2016 © IEC 2016
4.2.2 Voltage measurement
The resistance of the voltmeters used shall be at least 1 M Ω/V.
4.2.3 Current measurement
The entire assembly of the ammeter, the shunt and the leads shall be of an accuracy class of
0,5 or better.
4.2.4 Temperature measurements
The cell temperature shall be measured by use of a surface temperature measuring device
capable of an equivalent scale definition and accuracy of calibration as specified in 4.2.1. The
temperature should be measured at a location which most closely reflects the cell or cell block
temperature. The temperature may be measured at additional appropriate locations, if
necessary.
The examples for temperature measurement are shown in Figure 1. The instructions for
temperature measurement specified by the manufacturer shall be followed.
Prismatic or flat cell
Cylindrical cell
Temperature measuring device
Cell Cell
Thermal insulating material
IEC
Figure 1 – Example of temperature measurement of cell
4.2.5 Other measurements
Other values including capacity and power may be measured by use of a measuring device,
provided that it complies with 4.3.
4.3 Tolerance
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within these tolerances:
a) ±0,1 % for voltage;
b) ±1 % for current;
c) ±2 K for temperature;
d) ±0,1 % for time;
e) ±0,1 % for mass;
f) ±0,1 % for dimensions.
Cell
IEC 62660-3:2016 © IEC 2016 – 11 –
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement technique used, and all other sources of error in the test procedure.
4.4 Test temperature
If not otherwise defined, before each test the cell has to be stabilized at the test temperature
for a minimum of 12 h. This period can be reduced if thermal equilibrium is reached. Thermal
equilibrium is considered to be reached if after one interval of 1 h, the change of cell
temperature is lower than 1 K.
Unless otherwise stated in this standard, cells shall be tested at room temperature.
5 Electrical measurement
5.1 General charge conditions
Unless otherwise stated in this standard, prior to the electrical measurement test, the cell
shall be charged as follows.
Prior to charging, the cell shall be discharged at room temperature at a constant current of 1/3
I (A) for BEV application and
...