IEC 62660-3:2022

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

IEC 62660-3:2022 specifies test procedures and acceptance criteria for safety performance of secondary lithium-ion cells and cell blocks used for propulsion of electric vehicles (EV) including battery electric vehicles (BEV) and hybrid electric vehicles (HEV). This document determines 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 document 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).

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

L'IEC 62660-3:2022 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 (VE), y compris les véhicules électriques à batterie (VEB) et les véhicules électriques hybrides (VEH). Le présent document a pour objet de déterminer les performances de sécurité de base des éléments utilisés dans un groupe et système de batteries dans les conditions d'utilisation prévue et les mauvaises utilisations ou incidents raisonnablement prévisibles, pendant le fonctionnement normal du VE. Dans le présent document, les exigences de sécurité de l'élément s'appuient sur l'hypothèse selon laquelle les éléments sont correctement utilisés dans un groupe 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).

General Information

• Status: Published
• Publication Date: 28-Feb-2022
• ICS: 29.220.20 - Acid secondary cells and batteries
• ICS: 43.120 - Electric road vehicles
• Technical Committee: TC 21 - Secondary cells and batteries
• Drafting Committee: JWG 69 Li - TC 21/JWG 69 Li
• Current Stage: PPUB - Publication issued
• Start Date: 25-Mar-2022
• Completion Date: 01-Mar-2022

Relations

• Revises: IEC 62660-3:2016 - Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 3: Safety requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62660-3 ®
Edition 2.0 2022-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Secondary lithium-ion cells for the propulsion of electric road vehicles –
Part 3: Safety requirements
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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IEC 62660-3 ®
Edition 2.0 2022-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Secondary lithium-ion cells for the propulsion of electric road vehicles –
Part 3: Safety requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.220.20; 43.120 ISBN 978-2-8322-5348-9

– 2 – IEC 62660-3:2022 RLV © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION .
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Test conditions . 10
4.1 General . 10
4.2 Measuring instruments . 10
4.2.1 Range of measuring devices . 11
4.2.2 Voltage measurement . 11
4.2.3 Current measurement . 11
4.2.4 Temperature measurements . 11
4.2.5 Other measurements . 12
4.3 Tolerance . 12
4.4 Test temperature Thermal stabilization . 13
5 Electrical measurement . 13
5.1 General charge conditions . 13
5.2 Capacity . 13
5.3 SOC adjustment . 13
6 Safety tests . 13
6.1 General . 13
6.2 Mechanical tests . 14
6.2.1 Vibration .
6.2.1 Mechanical shock . 14
6.2.2 Crush . 14
6.3 Thermal test . 15
6.3.1 High temperature endurance. 15
6.3.2 Temperature cycling . 16
6.4 Electrical tests . 16
6.4.1 External short-circuit . 16
6.4.2 Overcharge . 16
6.4.3 Forced discharge . 17
6.4.4 Internal short-circuit test . 17
Annex A (informative) Operating region of cells for safe use . 20
A.1 General . 20
A.2 Charging conditions for safe use . 20
A.2.1 General . 20
A.2.2 Consideration on charging voltage . 20
A.2.3 Consideration on temperature . 21
A.3 Example of operating region . 22
Annex B (informative) Explanation for the internal short-circuit test . 23
B.1 General concept . 23
B.2 Internal short-circuit caused by the particle contamination . 23
Annex C (normative) Alternative internal short-circuit test (6.4.4.2.2) . 25
C.1 General . 25

C.2 Test preparation and test set-up . 25
C.2.1 Preparation of cell before the test . 25
C.2.2 Test setup . 27
C.2.3 Preliminary test . 28
C.3 Test procedure . 29
C.4 Acceptance criteria . 29
Bibliography . 30

Figure 1 – Example of temperature measurement of cell . 12
Figure 2 – Example of crush test . 15
Figure A.1 – An example of operating region for charging of typical lithium-ion cells . 22
Figure A.2 – An example of operating region for discharging of typical lithium-ion cells . 22
Figure C.1 – Example of case thinning . 25
Figure C.2 – Example of thinning tool . 26
Figure C.3 – Example of removing hard case . 26
Figure C.4 – Example of hard case removal method during cell manufacturing . 26
Figure C.5 – Example of fixation of cell . 27
Figure C.6 – Test setup image for voltage measurement . 27
Figure C.7 – Example of abrupt voltage drop . 28

Table B.1 – Examples of the internal short-circuit of cell . 24

– 4 – IEC 62660-3:2022 RLV © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY LITHIUM-ION CELLS FOR THE PROPULSION
OF ELECTRIC ROAD VEHICLES –
Part 3: Safety requirements
FOREWORD
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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,
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This redline version of the official IEC Standard allows the user to identify the changes made to
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...

IEC 62660-3 ®
Edition 2.0 2022-03
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

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
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The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
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need further assistance, please contact the Customer Service
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IEC 62660-3 ®
Edition 2.0 2022-03
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 978-2-8322-1083-3

– 2 – IEC 62660-3:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
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 . 9
4.2.3 Current measurement . 9
4.2.4 Temperature measurements . 9
4.2.5 Other measurements . 10
4.3 Tolerance . 10
4.4 Thermal stabilization . 10
5 Electrical measurement . 10
5.1 General charge conditions . 10
5.2 Capacity . 11
5.3 SOC adjustment . 11
6 Safety tests . 11
6.1 General . 11
6.2 Mechanical tests . 12
6.2.1 Mechanical shock . 12
6.2.2 Crush . 12
6.3 Thermal test . 13
6.3.1 High temperature endurance. 13
6.3.2 Temperature cycling . 13
6.4 Electrical tests . 14
6.4.1 External short-circuit . 14
6.4.2 Overcharge . 14
6.4.3 Forced discharge . 14
6.4.4 Internal short-circuit test . 15
Annex A (informative) Operating region of cells for safe use . 17
A.1 General . 17
A.2 Charging conditions for safe use . 17
A.2.1 General . 17
A.2.2 Consideration on charging voltage . 17
A.2.3 Consideration on temperature . 18
A.3 Example of operating region . 19
Annex B (informative) Explanation for the internal short-circuit test . 20
B.1 General concept . 20
B.2 Internal short-circuit caused by the particle contamination . 20
Annex C (normative) Alternative internal short-circuit test (6.4.4.2.2) . 22
C.1 General . 22
C.2 Test preparation and test set-up . 22
C.2.1 Preparation of cell before the test . 22

C.2.2 Test setup . 24
C.2.3 Preliminary test . 25
C.3 Test procedure . 26
C.4 Acceptance criteria . 26
Bibliography . 27

Figure 1 – Example of temperature measurement of cell . 10
Figure 2 – Example of crush test . 13
Figure A.1 – An example of operating region for charging of typical lithium-ion cells . 19
Figure A.2 – An example of operating region for discharging of typical lithium-ion cells . 19
Figure C.1 – Example of case thinning . 22
Figure C.2 – Example of thinning tool . 23
Figure C.3 – Example of removing hard case . 23
Figure C.4 – Example of hard case removal method during cell manufacturing . 23
Figure C.5 – Example of fixation of cell . 24
Figure C.6 – Test setup image for voltage measurement . 24
Figure C.7 – Example of abrupt voltage drop . 25

Table B.1 – Examples of the internal short-circuit of cell . 20

– 4 – IEC 62660-3:2022 © IEC 2022
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 Intern
...