IEC 61960-4:2020

IEC 61960-4 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Secondary lithium cells and batteries for portable applications –
Part 4: Coin secondary lithium cells, and batteries made from them

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs au lithium pour applications portables –
Partie 4: Éléments et batteries d'accumulateurs boutons au lithium

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IEC 61960-4 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid electrolytes –

Secondary lithium cells and batteries for portable applications –

Part 4: Coin secondary lithium cells, and batteries made from them

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –

Accumulateurs au lithium pour applications portables –

Partie 4: Éléments et batteries d'accumulateurs boutons au lithium

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.99 ISBN 978-2-8322-8069-0

– 2 – IEC 61960-4:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Parameter measurement tolerances . 7
5 Cell designation and marking . 7
5.1 Cell designation . 7
5.2 Marking . 9
5.2.1 General . 9
5.2.2 Small cells or batteries . 9
6 Electrical tests . 9
6.1 General . 9
6.2 Charging procedure for test purposes . 10
6.3 Discharge performance . 11
6.4 Charge (capacity) recovery after long-term storage . 12
6.5 Endurance in cycles . 12
6.6 Cell or battery internal resistance (AC resistance) . 13
6.6.1 General . 13
6.6.2 Test – General . 13
6.6.3 Measurement . 13
6.6.4 Acceptance criterion . 14
7 Differentiation . 14
Annex A (informative) Guidelines for designers of equipment using lithium batteries . 15
Bibliography . 16

Figure 1 – Dimensional characteristics . 8
Figure 2 – Sample sizes and sequence of tests . 10

Table 1 – Electrochemical systems in current practical use . 8
Table 2 – Examples of recommended upper limit charge voltage . 11
Table 3 – Recommended end-of-discharge voltage limit . 11
Table 4 – Minimum number of cycles . 13
Table A.1 – Equipment design guidelines . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR
OTHER NON-ACID ELECTROLYTES – SECONDARY LITHIUM CELLS
AND BATTERIES FOR PORTABLE APPLICATIONS –

Part 4: Coin secondary lithium cells, and batteries made from them

FOREWORD
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International Standard IEC 61960-4 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 International Standard is based on the following documents:
FDIS Report on voting
21A/725/FDIS 21A/726/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – IEC 61960-4:2020 © IEC 2020
A list of all parts in the IEC 61960 series, published under the general title Secondary cells and
batteries containing alkaline or other non-acid electrolytes – Secondary lithium cells and
batteries for portable applications, can be found on the IEC website.
The commit
...