SIST EN 61951-2:2017

SLOVENSKI STANDARD
SIST EN 61951-2:2017
01-september-2017
1DGRPHãþD
SIST EN 61951-2:2011
6HNXQGDUQLþOHQLLQEDWHULMH]DONDOQLPLDOLGUXJLPLQHNLVOLQVNLPLHOHNWUROLWL
6HNXQGDUQL]DWHVQMHQLþOHQLLQEDWHULMH]DSUHQRVQHQDSUDYHGHO1LNHOMNRYLQVNL
KLGULG
Secondary cells and batteries containing alkaline or other non-acid electrolytes -
Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal
hydride
Akkumulatoren und Batterien mit alkalischem oder anderen nichtsäurehaltigen
Elektrolyten - Tragbare wiederaufladbare gasdichte Einzelzellen - Teil 2: Nickel-
Metallhydrid
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Accumulateurs
étanches pour applications portables - Partie 2: Nickel-métal hydrure
Ta slovenski standard je istoveten z: EN 61951-2:2017
ICS:
29.220.30 $ONDOQLVHNXQGDUQLþOHQLLQ Alkaline secondary cells and
EDWHULMH batteries
SIST EN 61951-2:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61951-2:2017

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SIST EN 61951-2:2017


EUROPEAN STANDARD EN 61951-2

NORME EUROPÉENNE

EUROPÄISCHE NORM
June 2017
ICS 29.220.30 Supersedes EN 61951-2:2011
English Version
Secondary cells and batteries containing alkaline or other non
acid electrolytes - Secondary sealed cells and batteries for
portable applications - Part 2: Nickel-metal hydride
(IEC 61951-2:2017)
Accumulateurs alcalins et autres accumulateurs à Akkumulatoren und Batterien mit alkalischem oder anderen
électrolyte non acide - Accumulateurs étanches pour nichtsäurehaltigen Elektrolyten - Tragbare wiederaufladbare
applications portables - Partie 2: Nickel-métal hydrure gasdichte Einzelzellen - Teil 2: Nickel-Metallhydrid
(IEC 61951-2:2017) (IEC 61951-2:2017)
This European Standard was approved by CENELEC on 2017-04-26. 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, Serbia, 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
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61951-2:2017 E

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SIST EN 61951-2:2017
EN 61951-2:2017
European foreword
The text of document 21A/623/FDIS, future edition 4 of IEC 61951-2, prepared by SC 21A, Secondary
cells and batteries containing alkaline or other non-acid electrolytes, of IEC/TC 21 "Secondary cells
and batteries" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN 61951-2:2017.

The following dates are fixed:
• latest date by which the document has to be (dop) 2018-01-26
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-04-26
• latest date by which the national
standards conflicting with the
document have to be withdrawn

This document supersedes EN 61951-2:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights
Endorsement notice.
The text of the International Standard IEC 61951-2:2017 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 60051 (series) NOTE Harmonized as EN 60051 (series).
IEC 60086 (series) NOTE Harmonized as EN 60086 (series).
IEC 61434 NOTE Harmonized as EN 61434.

2

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SIST EN 61951-2:2017
EN 61951-2:2017

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 2004 International Electrotechnical Vocabulary - -
(IEV) -- Part 482: Primary and secondary
cells and batteries
IEC 60086-1 -  Primary batteries - Part 1: General EN 60086-1 -
IEC 60086-2 -  Primary batteries - Part 2: Physical and EN 60086-2 -
electrical specifications
IEC 61959 -  Secondary cells and batteries containing EN 61959 -
alkaline or other non-acid electrolytes -
Mechanical tests for sealed portable
secondary cells and batteries
IEC 62133-1 -  Secondary cells and batteries containing EN 62133-1 -
alkaline or other non-acid electrolytes -
Safety requirements for portable sealed
secondary cells, and for batteries made
from them, for use in portable applications
- Part 1: Nickel systems

3

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SIST EN 61951-2:2017

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SIST EN 61951-2:2017



IEC 61951-2

®


Edition 4.0 2017-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











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 978-2-8322-4011-3



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

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SIST EN 61951-2:2017
– 2 – IEC 61951-2:2017 © IEC 2017
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 9
5 Cell and battery designation and marking . 10
5.1 Cell and battery designation . 10
5.1.1 Small prismatic cells and cylindrical cells . 10
5.1.2 Button cells. 11
5.1.3 Batteries . 12
5.2 Cell or battery termination . 12
5.3 Marking . 12
5.3.1 Small prismatic cells and cylindrical cells . 12
5.3.2 Button cells. 13
5.3.3 Batteries . 13
5.4 Exemption of wording. 13
6 Dimensions. 13
6.1 Small prismatic cells and cylindrical cells . 13
6.1.1 General . 13
6.1.2 Small prismatic cells . 14
6.1.3 Cylindrical cells . 14
6.2 Button cells . 16
6.3 9 V type nickel-metal hydride batteries . 17
7 Electrical tests . 18
7.1 General . 18
7.2 Charging procedure for test purposes . 18
7.2.1 Charging procedure for cell. 18
7.2.2 Charging procedure for battery . 18
7.3 Discharge performance . 18
7.3.1 General . 18
7.3.2 Discharge performance at 20 °C . 19
7.3.3 Discharge performance at 0 °C . 20
7.3.4 Discharge performance for rapid charge cells (R cells) . 21
7.4 Charge (capacity) retention . 21
7.5 Endurance . 22
7.5.1 Endurance in cycles. 22
7.5.2 Permanent charge endurance . 25
7.6 Charge acceptance at constant voltage . 28
7.7 Overcharge . 28
7.7.1 Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells . 28
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells . 29
7.7.3 J cylindrical cells . 29
7.7.4 JT cylindrical cells . 29
7.7.5 R cylindrical cells . 30
7.8 Safety device operation . 30
7.9 Surface temperature limitation device operation (for S cell only) . 30

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SIST EN 61951-2:2017
IEC 61951-2:2017 © IEC 2017 – 3 –
7.10 Storage . 31
7.10.1 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries . 31
7.10.2 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries (high recovery type) . 32
7.11 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 33
7.12 Trickle charge acceptance for JT cylindrical cells . 34
7.13 Internal resistance . 34
7.13.1 General . 34
7.13.2 Measurement of the internal AC resistance . 35
7.13.3 Measurement of the internal DC resistance . 35
8 Mechanical tests . 36
9 Safety requirements . 36
10 Type approval and batch acceptance . 36
10.1 General . 36
10.2 Type approval . 36
10.2.1 Type approval for small prismatic cells and button cells . 36
10.2.2 Type approval for cylindrical cells . 40
10.2.3 Type approval for batteries . 42
10.3 Batch acceptance . 43
Bibliography . 45

Figure 1 – Jacketed cylindrical cells . 14
Figure 2 – Jacketed small prismatic cells . 14
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 15
Figure 4 – Button cells . 17
Figure 5 – 9 V type nickel-metal hydride batteries . 17

Table 1 – Dimensions of jacketed small prismatic cells . 14
Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with
primary cells . 15
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable
with primary cells . 16
Table 4 – Dimensions of button cells. 17
Table 5 – Dimensions of 9 V type nickel-metal hydride batteries . 18
Table 6 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 19
Table 7 – Discharge performance at 20 °C for button cells . 19
Table 8 – Discharge performance at 20 °C for batteries . 20
Table 9 – Rated capacity (mAh) compliance test (example) . 20
Table 10 – Discharge performance at 0 °C for small prismatic cells and cylindrical cells . 21
Table 11 – Discharge performance at 0 °C for button cells . 21
Table 12 – Endurance in cycles for small prismatic, button and cylindrical cells not
dimensionally interchangeable with primary cells . 22
Table 13 – Endurance in cycles for H or X cells . 23
Table 14 – Endurance in cycles for X cells . 23
Table 15 – Endurance in cycles for HR or XR cells . 24

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SIST EN 61951-2:2017
– 4 – IEC 61951-2:2017 © IEC 2017
Table 16 – Endurance in cycles for cylindrical cells dimensionally interchangeable with
primary cells . 24
Table 17 – Permanent charge endurance for L, M, H or X cells . 25
Table 18 – Permanent charge endurance for LT, MT or HT cells . 26
Table 19 – Permanent charge endurance for LU, MU or HU cells . 28
Table 20 – Overcharge at 0 °C . 29
Table 21 – Capacity deterioration due to storage period for cells or batteries . 32
Table 22 – Capacity deterioration due to storage period for cells or batteries (high
recovery type) . 33
Table 23 – Charge and discharge at +55 °C . 34
Table 24 – Trickle charge acceptance for JT cylindrical cells . 34
Table 25 – Constant discharge currents used for measurement of DC resistance . 36
Table 26 – Sequence of tests for type approval for small prismatic cells . 37
Table 27 – Sequence of tests for type approval for small prismatic cells (high recovery
type) . 38
Table 28 – Sequence of tests for type approval for button cells . 39
Table 29 – Sequence of tests for type approval for button cells (high recovery type) . 40
Table 30 – Sequence of tests for type approval for cylindrical cells . 41
Table 31 – Sequence of tests for type approval for cylindrical cells (high recovery
type) . 42
Table 32 – Sequence of tests for type approval for batteries . 43
Table 33 – Sequence of tests for type approval for batteries (high recovery type) . 43
Table 34 – Recommended test sequence for batch acceptance . 44

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SIST EN 61951-2:2017
IEC 61951-2:2017 © IEC 2017 – 5 –
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

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 61951-2 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 fourth edition cancels and replaces the third edition published in 2011 of which it
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• addition of battery type;
• addition of ‘F’ (high recovery type) designation for cells and batteries;
• addition of ‘I’ (low self-discharge type) designation for cells;

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SIST EN 61951-2:2017
– 6 – IEC 61951-2:2017 © IEC 2017
• revision of Figure 3 (6.1.3.1);
• addition of “optional pip” note to positive contact;
• changed leader line position from pip to flats of positive contact (B and G).
The text of this standard is based on the following documents:
FDIS Report on voting
21A/623/FDIS 21A/629/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.
A list of all parts of the IEC 61951 series can be found, under the general title Secondary cells
and batteries containing alkaline or other non-acid electrolytes – Secondary sealed cells and
batteries for portable applications, 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.

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SIST EN 61951-2:2017
IEC 61951-2:2017 © IEC 2017 – 7 –
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –

Part 2: Nickel-metal hydride



1 Scope
This part of IEC 61951 specifies marking, designation, dimensions, tests and requirements for
secondary sealed nickel-metal hydride small prismatic, cylindrical and button cells and
batteries, suitable for use in any orientation, for portable applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. 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
IEC 60086-1, Primary batteries – Part 1: General
IEC 60086-2, Primary batteries – Part 2: Physical and electrical specifications
IEC 61959, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Mechanical tests for sealed portable secondary cells and batteries
IEC 62133-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes
– Safety requirements for portable sealed secondary cells and for batteries made from them,
for use in portable applications – Part 1: Nickel systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 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
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell or a battery
Note 1 to entry: The nominal voltage of a sealed nickel-metal hydride rechargeable single cell is 1,2 V.
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.

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SIST EN 61951-2:2017
– 8 – IEC 61951-2:2017 © IEC 2017
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Addition of Notes 1 and 2 to entry.]
3.2
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
5
manufacturer which a single cell can deliver during a 5 h period when charging, storing and discharging under the
conditions specified in 7.3.2.
Note 2 to entry: The capacity of a battery is the quantity of electricity C Ah (ampere-hours) declared by the
5
manufacturer which a battery can deliver during a 5 h period, when charged, stored and discharged under the
procedure described in 7.3.2.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – Addition of Notes 1 and 2 to entry.]
3.3
small prismatic cell
cell in the form of a rectangular parallelepiped whose width and thickness dimensions
...