IEC 61951-1:2013

IEC 61951-1 ®
Edition 3.0 2013-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Portable sealed rechargeable single cells –
Part 1: Nickel-cadmium
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs individuels portables étanches –
Partie 1: Nickel-cadmium
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IEC 61951-1 ®
Edition 3.0 2013-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Portable sealed rechargeable single cells –

Part 1: Nickel-cadmium
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –

Accumulateurs individuels portables étanches –

Partie 1: Nickel-cadmium
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 29.220.30 ISBN 978-2-8322-1122-9

– 2 – 61951-1  IEC:2013
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 8
5 Cell designation and marking . 9
5.1 Cell designation . 9
5.1.1 Small prismatic cells and cylindrical cells . 9
5.1.2 Button cells . 10
5.2 Cell termination . 10
5.3 Marking . 11
5.3.1 Small prismatic cells and cylindrical cells . 11
5.3.2 Button cells . 11
6 Dimensions . 12
6.1 Small prismatic cells and cylindrical cells . 12
6.1.1 General . 12
6.1.2 Small prismatic cells . 12
6.1.3 Cylindrical cells . 13
6.2 Button cells. 15
7 Electrical tests . 16
7.1 General . 16
7.2 Charging procedure for test purposes . 16
7.3 Discharge performance . 16
7.3.1 General . 16
7.3.2 Discharge performance at 20 °C . 16
7.3.3 Discharge performance at –18 °C . 17
7.3.4 Discharge performance for rapid charge cells (R cells) . 18
7.4 Charge (capacity) retention . 18
7.5 Endurance . 18
7.5.1 Endurance in cycles . 18
7.5.2 Permanent charge endurance . 21
7.6 Charge acceptance at constant voltage . 26
7.7 Overcharge. 26
7.7.1 Small prismatic cells . 26
7.7.2 L, M, H or X cylindrical and button cells . 27
7.7.3 LT/LU, MT/MU or HT/HU cylindrical cells . 27
7.7.4 J cylindrical cells . 27
7.7.5 JT cylindrical cells . 28
7.7.6 R cylindrical cells . 28
7.8 Gas release device operation . 28
7.9 Storage . 29
7.10 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 29
7.11 Trickle charge acceptance for JT cylindrical cells . 30
7.12 Internal resistance . 30
7.12.1 General . 30

61951-1  IEC:2013 – 3 –
7.12.2 Measurement of the internal a.c. resistance . 31
7.12.3 Measurement of the internal d.c. resistance . 31
8 Mechanical tests . 32
9 Safety requirements . 32
10 Type approval and batch acceptance . 32
10.1 General . 32
10.2 Type approval . 32
10.2.1 Type approval for small prismatic cells . 32
10.2.2 Type approval for cylindrical and button cells. 32
10.3 Batch acceptance . 34
Annex A (informative) Procedure for measuring the capacity of a battery . 36
Bibliography . 37

Figure 1 – Jacketed cylindrical cells . 12
Figure 2 – Jacketed small prismatic cells . 12
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 13
Figure 4 – Button cells . 15

Table 1 – Dimensions of jacketed small prismatic cells . 12
Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with
primary cells . 13
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable
with primary cells . 14
Table 4 – Dimensions of button cells . 15
Table 5 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 16
Table 6 – Discharge performance at 20 °C for button cells . 17
Table 7 – Discharge performance at –18 °C for small prismatic cells . 17
Table 8 – Discharge performance at –18 °C for cylindrical cells . 17
Table 9 – Discharge performance at –18 °C for button cells . 18
Table 10 – Endurance in cycles for small prismatic cells and cylindrical cells not
dimensionally interchangeable with primary cells . 19
Table 11 – Endurance in cycles for H or X cells . 20
Table 12 – Endurance in cycles for cylindrical X cells .
...