Secondary cells and batteries containing alkaline or other non-acid electrolytes - Safety requirements for secondary lithium cells and batteries for use in electrical energy storage systems

IEC 63056:2020 specifies requirements and tests for the product safety of secondary lithium cells and batteries used in electrical energy storage systems (Figure 2) with a maximum DC voltage of 1 500 V (nominal).
Basic safety requirements for the secondary lithium cells and batteries used in industrial applications are included in IEC 62619. This document provides additional or specific requirements for electrical energy storage systems.
Since this document covers batteries for various electrical energy storage systems, it includes those requirements which are common and minimum to the electrical energy storage systems.
Examples of appliances that are within the scope of this document are:
• telecommunications,
• central emergency lighting and alarm systems,
• stationary engine starting,
• photovoltaic systems,
• home (residential) energy storage systems (HESS), and
• large energy storage: on-grid/off-grid.
This document applies to cells and batteries for uninterruptible power supplies (UPS).
This document does not apply to portable systems 500 Wh or below, which are covered by IEC 61960-3.
The contents of the corrigendum of June 2021 have been included in this copy.

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Exigences de sécurité pour les accumulateurs au lithium pour utilisation dans des systèmes de stockage d’énergie électrique

L'IEC 63056:2020 spécifie les exigences et les essais pour la sécurité des produits des éléments et des batteries d'accumulateurs au lithium utilisés dans des systèmes de stockage d'énergie électrique (Figure 2) ayant une tension continue maximale de 1 500 V (nominale).
L'IEC 62619 comprend les exigences relatives à la sécurité de base des éléments et batteries d'accumulateurs au lithium utilisés dans les applications industrielles. Le présent document inclut des exigences complémentaires ou particulières concernant les systèmes de stockage d'énergie électrique.
Étant donné que le présent document couvre les batteries de différents systèmes de stockage d'énergie électrique, elle comprend les exigences minimales et communes aux systèmes de stockage d'énergie électrique.
Les types suivants d'appareils sont des exemples d'appareils relevant du domaine d'application du présent document:
• télécommunications,
• systèmes centraux d'éclairage d'urgence et d'alarme d'urgence,
• démarrage de moteur stationnaire,
• systèmes photovoltaïques,
• systèmes domestiques (résidentiels) de stockage d'énergie électrique (HESS, home energy storage systems), et
• stockage d'énergie à grande échelle: sur réseau/hors réseau.
Le présent document s'applique aux éléments et batteries conçus pour les alimentations sans interruption (ASI).
Le présent document ne s'applique pas aux systèmes portables de 500 Wh ou moins, qui sont couverts par l'IEC 61960-3.
Le contenu du corrigendum de juin 2021 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
26-Mar-2020
Current Stage
PPUB - Publication issued
Completion Date
27-Mar-2020
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IEC 63056
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Safety requirements for secondary lithium cells and batteries
for use in electrical energy storage systems
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Exigences de sécurité pour les accumulateurs au lithium pour utilisation
dans des systèmes de stockage d'énergie électrique
IEC 63056:2020-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 63056
Edition 1.0 2020-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Safety requirements for secondary lithium cells and batteries
for use in electrical energy storage systems
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Exigences de sécurité pour les accumulateurs au lithium pour utilisation
dans des systèmes de stockage d'énergie électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.30 ISBN 978-2-8322-7862-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 63056:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

4 Parameter measurement tolerances ................................................................................ 9

5 General safety considerations ....................................................................................... 10

5.1 General ................................................................................................................. 10

5.2 Insulation and wiring ............................................................................................. 10

5.3 The peak voltage of charging ................................................................................ 11

6 Type test conditions ...................................................................................................... 11

6.1 General ................................................................................................................. 11

6.2 Test items ............................................................................................................. 11

7 Specific requirements and tests ..................................................................................... 12

7.1 Basic requirement ................................................................................................. 12

7.2 Resistance to abnormal heat ................................................................................. 12

7.3 Casing material of a battery system that can be transported for installation

or maintenance ..................................................................................................... 12

7.4 Electric insulation check during transport and installation...................................... 12

7.5 Charging procedures for test purposes ................................................................. 13

7.6 Protection against short circuit during transport and installation ............................ 13

7.7 Protection for reverse connection .......................................................................... 13

7.8 Overdischarge control of voltage (battery system) ................................................. 14

7.9 Drop test ............................................................................................................... 14

7.9.1 General ......................................................................................................... 14

7.9.2 Whole drop test ............................................................................................. 15

7.9.3 Edge and corner drop test ............................................................................. 15

8 Information for Safety .................................................................................................... 16

9 Marking and designation ................................................................................................ 16

Annex A (informative) Wiring, connections and supply ......................................................... 17

Bibliography .......................................................................................................................... 18

Figure 1 – IEC 62619 as umbrella standard to various industrial applications.......................... 5

Figure 2 – Scope of IEC 63056 ............................................................................................... 6

Figure 3 – Impact location ..................................................................................................... 15

Figure 4 – Configuration for the shortest edge drop test ........................................................ 16

Figure 5 – Configuration for the corner drop test ................................................................... 16

Table 1 – Type test ............................................................................................................... 12

Table 2 – Drop test method and condition ............................................................................. 14

Table A.1 – IEC 60950-1:2005 subclauses addressing wiring, connections and supply ......... 17

Table A.2 – Wiring, connections and supply, as addressed in IEC 62368-1 ........................... 17

---------------------- Page: 4 ----------------------
IEC 63056:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR OTHER
NON-ACID ELECTROLYTES – SAFETY REQUIREMENTS FOR SECONDARY
LITHIUM CELLS AND BATTERIES FOR USE IN ELECTRICAL ENERGY
STORAGE SYSTEMS
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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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 63056 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 International Standard is based on the following documents:
FDIS Report on voting
21A/718/FDIS 21A/723/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 5 ----------------------
– 4 – IEC 63056:2020 © IEC 2020

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document 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.
---------------------- Page: 6 ----------------------
IEC 63056:2020 © IEC 2020 – 5 –
INTRODUCTION

This document covers safety requirements for secondary lithium cells and batteries for use in

Electrical Energy Storage Systems and is under the umbrella standard IEC 62619 as shown in

Figure 1. As an umbrella standard, IEC 62619 had been developed which covered various

industrial applications in 2017.
Figure 1 – IEC 62619 as umbrella standard to various industrial applications
---------------------- Page: 7 ----------------------
– 6 – IEC 63056:2020 © IEC 2020
SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR OTHER
NON-ACID ELECTROLYTES – SAFETY REQUIREMENTS FOR SECONDARY
LITHIUM CELLS AND BATTERIES FOR USE IN ELECTRICAL ENERGY
STORAGE SYSTEMS
1 Scope

This document specifies requirements and tests for the product safety of secondary lithium

cells and batteries used in electrical energy storage systems (Figure 2) with a maximum DC

voltage of 1 500 V (nominal).

Basic safety requirements for the secondary lithium cells and batteries used in industrial

applications are included in IEC 62619. This document provides additional or specific

requirements for electrical energy storage systems.

Since this document covers batteries for various electrical energy storage systems, it includes

those requirements which are common and minimum to the electrical energy storage systems.

Examples of appliances that are within the scope of this document are:
• telecommunications,
• central emergency lighting and alarm systems,
• stationary engine starting,
• photovoltaic systems,
• home (residential) energy storage systems (HESS), and
• large energy storage: on-grid/off-grid.

This document applies to cells and batteries for uninterruptible power supplies (UPS).

This document does not apply to portable systems 500 Wh or below, which are covered by

IEC 61960-3.
Figure 2 – Scope of IEC 63056
---------------------- Page: 8 ----------------------
IEC 63056:2020 © IEC 2020 – 7 –
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 (IEV) – Part 482: Primary and

secondary cells and batteries (available at http://www.electropedia.org/)

IEC 60695-10-2, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test method

IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical

flame test methods

IEC 60950-1:2005, Information technology equipment – Safety – Part 1: General requirements

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 62620:2014, Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Secondary lithium cells and batteries for use in industrial applications

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,

ISO/IEC Guide 51, and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
safety
freedom from unacceptable risk
3.2
risk

combination of the probability of occurrence of harm and the severity of that harm

3.3
harm

physical injury or damage to the health of people or damage to property or to the environment

3.4
hazard
potential source of harm
3.5
intended use

use of a product, process or service in accordance with specifications, instructions and

information provided by the supplier
---------------------- Page: 9 ----------------------
– 8 – IEC 63056:2020 © IEC 2020
3.6
reasonably foreseeable misuse

use of a product, process or service in a way which is not intended by the supplier, but which

may result from readily predictable human behaviour
3.7
secondary lithium cell
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.

3.8
cell block

group of cells connected together in parallel configuration with or without protective devices

(e.g. fuse or positive temperature coefficient device) 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.
3.9
module

group of cells connected together in a series and/or parallel configuration with or without

protective devices (e.g. fuse or positive temperature coefficient device) and monitoring

circuitry
3.10
battery pack

energy storage device which comprises one or more cells or modules electrically connected

and has monitoring circuitry which provides information (e.g. cell voltage) to a battery system

to influence the battery’s safety, performance and/or service life

Note 1 to entry: It may incorporate a protective housing and be provided with terminals or other interconnection

arrangement.
3.11
battery system
battery

system which comprises one or more cells, modules or battery packs and has a battery

management system capable of controlling current in case of overcharge, overcurrent,

overdischarge, and overheating

Note 1 to entry: Overdischarge cut off is not mandatory if there is an agreement between the cell manufacturer

and the customer

Note 2 to entry: The battery system may have cooling or heating units. More than one battery system may

constitute a larger battery system.
3.12
battery management system
BMS

set of protection functions associated with a battery to prevent overcharge, overcurrent, over-

temperature, under-temperature and, if applicable, overdischarge and 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

Note 1 to entry: Overdischarge cutoff is not mandatory if there is an agreement between the cell manufacturer

and the customer.
---------------------- Page: 10 ----------------------
IEC 63056:2020 © IEC 2020 – 9 –

Note 2 to entry: The function of the BMS can be assigned to the battery pack or to equipment that uses the

battery.

Note 3 to entry: The BMS can be divided and it can be found partially in the battery pack and partially on the

equipment that uses the battery.

Note 4 to entry: The BMS is sometimes also referred to as a BMU (battery management unit).

Note 5 to entry: This note applies to the French language only.
3.13
leakage
visible escape of liquid electrolyte
3.14
venting

release of excessive internal pressure from a cell, module, battery pack, or battery system in

a manner intended by design to preclude rupture or explosion
3.15
rupture

mechanical failure of a cell container or battery case induced by an internal or external cause,

resulting in exposure or spillage but not ejection of materials
3.16
explosion

failure that occurs when a cell container or battery case opens violently, and solid

components are forcibly expelled
Note 1 to entry: Liquid, gas, and smoke may be erupted.
3.17
fire
emission of flames from a cell, module, battery pack, or battery system
3.18
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 C Ah (ampere-hours) declared by the

manufacturer, which a single cell or battery can deliver during an n-hour period when charging, storing and

discharging under the conditions specified in IEC 62620:2014, 6.3.1.

[SOURCE: IEC 60050-482:2004, 482-03-15, modified – "battery" has been replaced by "cell

or battery" and Note 1 to entry has been added.]
4 Parameter measurement tolerances

The overall accuracy of controlled or measured values, relative to the specified or actual

parameters, 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 mass;
f) ±1 % for dimensions.
---------------------- Page: 11 ----------------------
– 10 – IEC 63056:2020 © IEC 2020

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 General safety considerations
5.1 General

Battery systems and the cells they contain shall comply with the applicable general safety

considerations of IEC 62619. Within the standard temperature range, secondary cells can be

charged at the maximum charge current, which is specified from a safety point of view.

Lithium-ion cells shall always be operated within the operating region values and the storage

conditions specified by the manufacturer.

The safety of lithium secondary cells and battery systems requires the consideration of two

sets of applied conditions:
1) intended use;
2) reasonably foreseeable misuse.

Cells and battery systems shall be so designed and constructed that they are safe under

conditions of both intended use and reasonably foreseeable misuse. It may also be expected

that cells and battery systems subjected to intended use shall not only be safe but shall

continue to be functional in all respects.

It is expected that cells or battery systems subjected to misuse may fail to function. However,

even if such a situation occurs, they shall not present any significant hazards.
Potential hazards which are the subject of this document are:
a) fire,
b) burst/explosion,

c) critical electrical short circuit due to leakage of cell electrolyte, mechanical deformation or

incorrect installation,
d) venting that continuously vents out flammable gases,

e) rupture of the casing of cell, module, battery pack, and battery system with exposure of

internal components.

Conformity is checked by the tests in accordance with the appropriate standards in Clause 2.

Moving parts that have potential to cause human injuries shall be applied appropriate design

and necessary measures in order to reduce the risk of injuries, including those that may be

incurred during installation while cells or battery systems are being incorporated into

equipment.
5.2 Insulation and wiring

Wiring and its insulation shall be sufficient to withstand the maximum anticipated voltage,

current, temperature, altitude and humidity requirements. The design of wiring shall be such

that adequate clearances and creepage distances are maintained between conductors in

accordance with IEC 60950-1:2005, 3.1 and 3.2 (test temperature relies on the battery

system’s operating region specified by the manufacturer). Hazardous live parts of the battery

system shall be protected to avoid the risk of electric shocks, including during installation.

---------------------- Page: 12 ----------------------
IEC 63056:2020 © IEC 2020 – 11 –

The mechanical integrity of the whole battery system (cell/module/BMS) and their connections

shall follow the requirements from the end-use equipment manufacturer. When there are no

requirements provided from the end use equipment in which the battery system is to be

installed, Annex A may be used.

The battery system manufacturer shall indicate the maximum allowed number of series

connections of a module or a battery system in the specification or instruction manual.

5.3 The peak voltage of charging

When a charging current has an alternating component, a battery system manufacturer shall

ensure that the peak voltage of the charging current is under the upper limit charging voltage,

specified by the battery system manufacturer, by monitoring the voltage of every single cell or

cell block.
6 Type test conditions
6.1 General

A battery system that is used outside of its operating region may exhibit hazards resulting

from the cells or battery system. Such risks have to be taken into consideration in order to

prepare a safe test plan.

The test facility should have a sufficient structural integrity and a fire suppression system to

sustain the conditions of overpressure and fire that may occur as a result of testing. The

facility should have a ventilation system to remove and capture gas that might be produced

during the tests. Consideration should be given to high-voltage hazards when applicable.

Warning: THESE TESTS USE PROCEDURES WHICH MAY RESULT IN HARM IF ADEQUATE PRECAUTIONS

ARE NOT TAKEN. TESTS SHOULD ONLY BE PERFORMED BY QUALIFIED AND EXPERIENCED
TECHNICIANS USING ADEQUATE PROTECTION. TO PREVENT BURNS, PRECAUTIONS SHOULD
BE TAKEN FOR THOSE CELLS OR BATTERY SYSTEMS WHOSE CASINGS MAY EXCEE
...

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