IEC 61951-2:2017/AMD1:2022

IEC 61951-2
®

Edition 4.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1

Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary sealed cells and batteries for portable applications –
Part 2: Nickel-metal hydride

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs étanches pour applications portables –
Partie 2: Nickel-métal hydrure

IEC 61951-2:2017-03/AMD1:2022-10(en-fr)

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2022 IEC, Geneva, Switzerland

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
your local IEC member National Committee for further information.


Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland

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 have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
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 once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.


A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur les adapté à vos besoins.
projets et les publications remplacées ou retirées.

Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au monde,
Restez informé sur les nouvelles publications IEC. Just
avec plus de 22 300 articles terminologiques en anglais et en
Published détaille les nouvelles publications parues.
français, ainsi que les termes équivalents dans 19 langues
Disponible en ligne et une fois par mois par email.
additionnelles. Egalement appelé Vocabulaire

Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.

---------------------- Page: 2 ----------------------
IEC 61951-2

®


Edition 4.0 2022-10




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE




A MENDMENT 1

AM ENDEMENT 1





Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Secondary sealed cells and batteries for portable applications –

Part 2: Nickel-metal hydride




Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –

Accumulateurs étanches pour applications portables –


Partie 2: Nickel-métal hydrure













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.220.30 ISBN 978-2-8322-5873-6




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 61951-2:2017/AMD1:2022
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –

Part 2: Nickel-metal hydride

AMENDMENT 1

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 document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 61951-2:2017 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 Amendment is based on the following documents:
Draft Report on voting
21A/809/FDIS 21A/816/RVD

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.

---------------------- Page: 4 ----------------------
IEC 61951-2:2017/AMD1:2022 – 3 –
© IEC 2022
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under 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.

___________

2 Normative references
Add, at the end of the existing list, IEC 62902 to the list of normative references, as follows:
IEC 62902, Secondary cells and batteries – Marking symbols for identification of their chemistry
3 Terms and definitions
Add the following term and definition for "trickle charge":
3.15
trickle charge
charge method by supplying a small electrical current to the cell while disconnecting the cell
from load to supplement self-discharge of the cell
5.3.1 Small prismatic cells and cylindrical cells
Replace, in the sixth bullet point, "name or identification" with "name, identification or registered
trademark" as follows:
• name, identification or registered trademark of manufacturer or supplier;
5.3.2 Button cells
Replace, in the fourth bullet point, "name or identification" with "name, identification or
registered trademark" as follows:
• name, identification or registered trademark of manufacturer or supplier.
5.3.3 Batteries
Add a fourth bullet point at the end of the existing bulleted list as follows:
• marking symbols (identification of the chemistry according to IEC 62902).

---------------------- Page: 5 ----------------------
– 4 – IEC 61951-2:2017/AMD1:2022
© IEC 2022
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable with
primary cells
Replace the existing Table 3 with the following Table 3 (various changes and corrections have
been made):
Table 3 – Example of dimensions of jacketed cylindrical cells
not dimensionally interchangeable with primary cells
a

Cell designation Diameter Height
mm mm

HR 11/30 10,5 30,0
10,5 44,5
HR 11/45
HR 11/51 10,5 50,5
HR 11/67 10,5 67,0
14,5 17,5
HR 15/18
HR 15/28 14,5 28,0
0
HR 15/30 14,5 30,0
–1,5
14,5 43,0
HR 15/43
HR 15/49 14,5 49,0
0
HR 15/51 14,5 50,5
–0,7
15,0 67,0
HR 15/67
HR 17/29 17,0 28,5
HR 17/43 17,0 43,0
HR 17/50 17,0 50,0
0
–2,0
HR 17/67 17,0 67,0
HR 18/44 18,0 43,5
HR 18/67 18,0 67,0
HR 19/67 19,0 67,0
HR 19/68 18,5 67,5
0
HR 23/34 23,0 34,0
–1,5

HR 23/43 23,0 43,0
HR 23/44 23,0 43,5
HR 23/50 23,0 50,0
HR 23/61 23,0 61,0
HR 26/47 25,8 47,0
0
–1,0
HR 26/50 25,8 50,0
0
–2,0
HR 33/36 33,0 36,0
HR 33/62 33,0 61,5
HR 33/91 33,0 91,0 0/–2,5
HR 34/60 33,5 59,5 0/–2,0
HR 43/91 43,0 91,0 0/–2,5
a
 The letters HR to be followed by L, M, H or X and T and/or R as appropriate (see 5.1).

---------------------- Page: 6 ----------------------
IEC 61951-2:2017/AMD1:2022 – 5 –
© IEC 2022
Table 6 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells
Replace the existing Table 6 with the following new Table 6 (J and JT designations have been
separated from "M/MT/MU/MS"):
Table 6 – Discharge performance at 20 °C for
small prismatic cells and cylindrical cells
Discharge conditions Minimum discharge duration
h/min
Rate of Final voltage Cell designation
constant
current
L/LT/LU/LS M/MT/MU/MS/ J JT H/HT/HU X
A V
a

1,0 5 h 5 h 5 h 5 h 5 h 5 h
0,2 I
t
1,0 I 0,9 – 42 min 48 min 43 min 48 min 54 min
t
b

0,8 – –  6 min 9 min
5,0 I
t
b

0,7 – –  – 4 min
10,0 I
t
a
Five cycles are permitted per cell for this test. The test shall be terminated at the end of the first cycle of each
cell which meets the requirement.
b
Prior to the 5 I A and 10 I A tests, a conditioning cycle may be included if necessary. This cycle shall consist
t t
of charging at 0,1 I A in accordance with 7.2 and discharging at 0,2 I A in an ambient temperature of
t t
20 °C ± 5 °C according to 7.3.2.

7.5.1.2 Small prismatic, button and cylindrical cells not dimensionally interchangeable
with primary cells
Add, in the second bullet point of the bulleted list, "LS" and "MS" to the 500 cycle requirement,
as follows:
• 500 for L/LS/LR, M/MS/MR, J/JR, H/HR or X/XR cells;
7.5.1.4 Cylindrical cells dimensionally interchangeable with primary cells
In Table 16, add a new footnote b and a footnote reference to that footnote in the first row of
the "Discharge" column as follows (the original footnote b becomes footnote c):
Table 16 – Endurance in cycles for cylindrical cells dimensionally
interchangeable with primary cells
Stand in charged
Cycle number Charge Discharge Subsequent rest
condition
a b
1 to 49 20 min to 30 min 10 min to 90 min
0,5 I A for 0,5 I A to 1,0 V
t t
50 0,10 I A for 16 h 0,2 I A to 1,0 V c
1 h to 4 h
t t
a
Charge termination is –ΔV = 5 mV to 10 mV or 132 min. Additionally, if charge termination does not comply
with the aforementioned condition, testing shall be terminated.
b
If discharge duration to the final voltage of 1,0 V on any cycle becomes less than 72 min, testing shall be
terminated.
c
It is permissible to allow sufficient open-circuit rest time after the completion of discharge at cycle 50, so as to
start cycle 51 at a convenient time. A similar procedure may be adopted at cycles 100, 150.

---------------------- Page: 7 ----------------------
– 6 – IEC 61951-2:2017/AMD1:2022
© IEC 2022
Replace the existing bulleted list, including the introductory sentence to the list, with the
following:
The total number of cycles obtained when the test is completed shall not be less than:
• 200 for HR03 cells with a rated capacity less than 800 mAh;
• 100 for HR03 cells with a rated capacity of 800 mAh or more;
• 200 for HR6 cells with a rated capacity less than 2 100 mAh;
• 100 for HR6 cells with a rated capacity of 2 100 mAh or more;
• 200 for HR20 and HR14 cells.
7.5.2.2 L, M, H or X cylindrical cells
Add the J designation to the title of 7.5.2.2 as follows:
7.5.2.2 L, M, J, H or X cylindrical cells
Add the J designation to the title of Table 17 as follows:
Table 17 – Permanent charge endurance for L, M, J, H or X cells
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells
Replace, in the final sentence of 7.7.2, the reference to Table 9 with a reference to Table 10 as
follows:
The duration of discharge shall not be less than that specified in Table 10.
7.8 Safety device operation
Replace the existing title to 7.8 with the following:
7.8 Pressure relief feature
Replace the first paragraph after the warning statement with the following paragraph:
The following test shall be carried out in order to establish that the pressure relief feature of the
cell will operate to allow the escape of gas when the internal pressure exceeds a critical value.
7.13 Internal resistance
7.13.1 General
Add, after the second paragraph, the following paragraph:
There is no requirement for internal resistance, but when there is a value requested,
measurement is performed according to the method described in this document.
7.13.2 Measurement of the internal AC resistance
Replace the first sentence with the following:
The alternating root mean square voltage, U , shall be measured when applying to the cell an
a
alternating root mean square current, I , at the frequency of 1,0 kHz ± 0,1 kHz for a period of
a
1 s to 5 s.

---------------------- Page: 8 ----------------------
IEC 61951-2:2017/AMD1:2022 – 7 –
© IEC 2022
Replace the introductory sentence to the formula, the formula itself, and the list of symbols,
with the following:
The internal AC resistance, R , is g
...