Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 2: Nickel-metal hydride

IEC 61951-2:2011 specifies marking, designation, dimensions, tests and requirements for portable sealed nickel-metal hydride, small prismatic, cylindrical and button rechargeable single cells, suitable for use in any orientation. This third edition cancels and replaces the second edition published in 2003 of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- clause 4: addition of 2 parameters;
- clause 5: addition of cells type "S" and cells type "T";
- subclause 6.1.2: addition of new cylindrical cells;
- subclause 7.8: addition of a specific test for "S" cells.

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

La CEI 61951-2:2011 spécifie le marquage, la désignation, les dimensions, les essais et les exigences applicables aux petits éléments parallélépipédiques, aux éléments cylindriques et aux éléments boutons, individuels, portables, rechargeables, étanches, au nickel-métal hydrure, pouvant être utilisés dans toutes les orientations. Cette troisième édition annule et remplace la deuxième édition parue en 2003, dont elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- article 4: ajout de 2 paramètres;
- article 5: ajout d'éléments type "S" et éléments type "T";
- paragraphe 6.1.2: ajout de nouveaux éléments cylindriques;
- paragraphe 7.8: ajout d'un essai spécifique pour les éléments "S".

General Information

Status
Published
Publication Date
24-May-2011
Current Stage
DELPUB - Deleted Publication
Completion Date
22-Mar-2017
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IEC 61951-2:2011 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 2: Nickel-metal hydride Released:5/25/2011
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IEC 61951-2 ®
Edition 3.0 2011-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Portable sealed rechargeable single cells –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs individuels portables étanches –
Partie 2: Nickel-métal hydrure

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IEC 61951-2 ®
Edition 3.0 2011-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Portable sealed rechargeable single cells –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs individuels portables étanches –
Partie 2: Nickel-métal hydrure

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 29.220.30 ISBN 978-2-88912-497-8

– 2 – 61951-2 © IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Parameter measurement tolerances . 7
5 Cell designation and marking. 8
5.1 Cell designation . 8
5.1.1 Small prismatic cells and cylindrical cells . 8
5.1.2 Button cells . 9
5.2 Cell termination . 9
5.3 Marking . 9
5.3.1 Small prismatic cells and cylindrical cells . 9
5.3.2 Button cells . 10
6 Dimensions . 10
6.1 Small prismatic cells and cylindrical cells . 10
6.1.1 General . 10
6.1.2 Small prismatic cells . 11
6.1.3 Cylindrical cells . 12
6.2 Button cells . 14
7 Electrical tests . 14
7.1 General . 14
7.2 Charging procedure for test purposes . 14
7.3 Discharge performance . 15
7.3.1 General . 15
7.3.2 Discharge performance at 20 °C . 15
7.3.3 Discharge performance at 0 °C . 15
7.3.4 Discharge performance for rapid charge cells (R cells) . 16
7.4 Charge (capacity) retention . 16
7.5 Endurance . 17
7.5.1 Endurance in cycles . 17
7.5.2 Permanent charge endurance . 19
7.6 Charge acceptance at constant voltage . 23
7.7 Overcharge . 23
7.7.1 Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells . 23
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells . 23
7.7.3 R cylindrical cells. 23
7.8 Safety device operation . 24
7.9 Surface temperature limitation device operation (for S cell only) . 24
7.10 Storage . 25
7.11 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 25
7.12 Internal resistance . 26
7.12.1 General . 26
7.12.2 Measurement of the internal a.c. resistance . 26
7.12.3 Measurement of the internal d.c. resistance . 27
8 Mechanical tests. 27

61951-2 © IEC:2011 – 3 –
9 Safety requirements . 27
10 Type approval and batch acceptance. 27
10.1 Type approval . 27
10.1.1 Type approval for small prismatic cells and button cells . 27
10.1.2 Type approval for cylindrical cells . 28
10.2 Batch acceptance . 29
Bibliography . 31

Figure 1 – Jacketed cylindrical cells . 11
Figure 2 – Jacketed small prismatic cells . 11
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 12
Figure 4 – Button cells . 14

Table 1 – Dimensions of jacketed small prismatic cells . 11
Table 2 – Jacketed cylindrical cells dimensionally interchangeable with primary cells . 12
Table 3 – Jacketed cylindrical cells not dimensionally interchangeable with primary
cells . 13
Table 4 – Dimensions of button cells . 14
Table 5 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 15
Table 6 – Discharge performance at 20 °C for button cells . 15
Table 7 – Discharge performance at 0 °C for small prismatic cells and cylindrical cells . 16
Table 8 – Discharge performance at 0 °C for button cells . 16
Table 9 – Endurance in cycles for small prismatic, button and cylindrical cells not
dimensionally interchangeable with primary cells . 17
Table 10 – Endurance in cycles for H or X cells . 18
Table 11 – Endurance in cycles for X cells . 18
Table 12 – Endurance in cycles for HR or XR cells . 19
Table 13 – Permanent charge endurance for L, M, H or X cells . 19
Table 14 – Permanent charge endurance for LT, MT or HT cells . 21
Table 15 – Permanent charge endurance for LU, MU or HU cells . 22
Table 16 – Overcharge at 0 °C . 23
Table 17 – Charge and discharge at +55 °C . 26
Table 18 – Constant discharge currents used for measurement of d.c. resistance . 27
Table 19 – Sequence of tests for type approval for small prismatic and for button cells . 28
Table 20 – Sequence of tests for type approval for cylindrical c
...

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