oSIST prEN IEC 61960-4:2023

SLOVENSKI STANDARD
oSIST prEN IEC 61960-4:2023
01-maj-2023
Sekundarni členi in baterije, ki vsebujejo alkalne ali druge nekislinske elektrolite -
Sekundarni litijevi členi in baterije za prenosne naprave - 4. del: Gumbni litijevi
sekundarni členi in baterije, izdelane iz njih
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
Sekundärzellen und -batterien mit alkalischen oder anderen nicht-säurehaltigen
Elektrolyten - Sekundäre Lithiumzellen und -batterien für tragbare Anwendungen - Teil 4:
Sekundäre Lithium-Knopfzellen und daraus hergestellte Batterien
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Accumulateurs
au lithium pour applications portables - Partie 4: Éléments et batteries daccumulateurs
boutons au lithium
Ta slovenski standard je istoveten z: prEN IEC 61960-4:2023
ICS:
29.220.30 Alkalni sekundarni členi in Alkaline secondary cells and
baterije batteries
oSIST prEN IEC 61960-4:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN IEC 61960-4:2023

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21A/829/CDV

COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61960-4 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-03-17 2023-06-09
SUPERSEDES DOCUMENTS:
21A/801/CD, 21A/814A/CC

IEC SC 21A : SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR OTHER NON-ACID ELECTROLYTES
SECRETARIAT: SECRETARY:
France Mr Pierre Bourg
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 35
Other TC/SCs are requested to indicate their interest, if any, in this
CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of
• any relevant patent rights of which they are aware and to provide supporting documentation ,
• any relevant “in some countries” clauses to be included should this proposal proceed. Recipients are remin ded that
the enquiry stage is the final stage for submitting "in some countries" clauses. See AC/22/2007.

TITLE:
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

PROPOSED STABILITY DATE: 2026

Copyright © 2023 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

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NOTE FROM TC/SC OFFICERS:
Revision of IEC 61960-4 was accepted per 21A/780/RQ on 2022 05 20 and the CD was discussed at the WG3
meeting on October 27th, 2022 in San Francisco (USA). The revised CC was issued after the meeting and
released on January 20th 2023. The project leader Mr Takahisa Raisen included all the changes decided in the
revision of the standard Ed2.

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1 CONTENTS
2
3 FOREWORD . 5
4 1 Scope . 7
5 2 Normative references . 7
6 3 Terms and definitions . 8
7 4 Parameter measurement tolerances . 9
8 5 Cell designation and marking . 9
9 5.1 Cell designation . 9
10 5.2 Marking . 11
11 5.2.1 General . 11
12 5.2.2 Swallowable cells or batteries . 11
13 6 Electrical tests . 12
14 6.1 General . 12
15 6.2 Charging procedure for test purposes . 13
16 6.3 Discharge performance . 14
17 6.4 Charge (capacity) recovery after long-term storage . 15
18 6.5 Endurance in cycles . 15
19 6.6 Cell or battery internal resistance (AC resistance). 16
20 6.6.1 General . 16
21 6.6.2 Test – General . 16
22 6.6.3 Measurement . 16
23 6.6.4 Acceptance criterion . 17
24 7 Differentiation . 17
25 Annex A (normative) Requirements for secondary lithium watch batteries . 18
26 A.1 General . 18
27 A.2 Physical requirements . 18
28 A.2.1 Symbols and shape of cell . 18
29 A.2.2 Dimensions and size codes . 18
30 A.3 Test methods for determining the resistance to leakage . 21
31 A.3.1 Preconditioning and initial visual examination . 21
32 A.3.2 A.3.2 High Temperature and humidity test . 21
33 A.3.3 Test by temperature cycle . 21
34 A.4 Visual examination and acceptance criteria . 22
35 A.4.1 Preconditioning . 22
36 A.4.2 Magnification . 22
37 A.4.3 Leakage levels and classification . 22
38 A.4.4 Acceptance conditions . 22
39 Annex B (informative) Guidelines for designers of equipment using lithium batteries . 23
40 Bibliography . 24
41
42 Figure 1 – Dimensional characteristics . 10
43 Figure 2 – Sample sizes and sequence of tests . 13
44 Figure A.1 – Dimensional drawing . 18
45 Figure A.2 – Test by temperature cycles . 21

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46
47 Table 1 – Electrochemical systems in current practical use . 10
48 Table 2 – Examples of generally used upper limit charge voltage. 14
49 Table 3 –Example of generally used lower limit end-of-discharge voltage limit . 15
50 Table 4 – Minimum number of cycles . 16
51 Table A.1 – Dimensions and size codes for watch batteries . 20
52 Table A.2 – Storage conditions . 21
53 Table B.1 – Equipment design guidelines. 23
54
55

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56 INTERNATIONAL ELECTROTECHNICAL COMMISSION
57 ____________
58
59 SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR
60 OTHER NON-ACID ELECTROLYTES – SECONDARY LITHIUM CELLS
61 AND BATTERIES FOR PORTABLE APPLICATIONS –
62
63 Part 4: Coin secondary lithium cells, and batteries made from them
64
65 FOREWORD
66 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
67 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote internation al
68 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
69 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
70 Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
71 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
72 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
73 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
74 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
75 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
76 consensus of opinion on the relevant subjects since each technical committee has representation from all
77 interested IEC National Committees.
78 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
79 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
80 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
81 misinterpretation by any end user.
82 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
83 transparently to the maximum extent possible in their national and regional publications. Any divergence between
84 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
85 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
86 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
87 services carried out by independent certification bodies.
88 6) All users should ensure that they have the latest edition of this publication.
89 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
90 members of its technical committees and IEC National Committees for any personal injury, property damage or
91 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
92 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
93 Publications.
94 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
95 indispensable for the correct application of this publication.
96 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
97 rights. IEC shall not be held responsible for identifying any or all such patent rights.
98 International Standard IEC 61960-4 has been prepared by subcommittee 21A: Secondary cells
99 and batteries containing alkaline or other non-acid electrolytes, of IEC technical committee 21:
100 Secondary cells and batteries.
101 This second edition cancels and replaces the first edition published in 2020. This edition
102 constitutes a technical revision.
103 This edition includes the following significant technical changes with respect to the previous
104 edition:
105 a) added an annex to standardize requirements for secondary lithium watch batteries;
106 b) added new chemistries;
107 c) added a table to standardize dimensions and size codes for secondary lithium watch
108 batteries;
109 d) modified marking requirements;

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110 The text of this International Standard is based on the following documents:
FDIS Report on voting

111
112 Full information on the voting for the approval of this International Standard can be found in the
113 report on voting indicated in the above table.
114 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
115 A list of all parts in the IEC 61960 series, published under the general title Secondary cells and
116 batteries containing alkaline or other non-acid electrolytes – Secondary lithium cells and
117 batteries for portable applications, can be found on the IEC website.
118 The committee has decided that the contents of this document will remain unchanged until the
119 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
120 the specific document. At this date, the document will be
121 • reconfirmed,
122 • withdrawn,
123 • replaced by a revised edition, or
124 • amended.
125
126

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127 SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR
128 OTHER NON-ACID ELECTROLYTES – SECONDARY LITHIUM CELLS
129 AND BATTERIES FOR PORTABLE APPLICATIONS –
130
131 Part 4: Coin secondary lithium cells, and batteries made from them
132
133
134
135 1 Scope
136 This part of IEC 61960 specifies performance tests, designations, markings, dimensions and
137 other requirements for coin secondary lithium cells and batteries for portable applications,
138 watches, and backup power supply such as memory backup applications. In particular, watch-
139 specific requirements are specified in Annex A.
140 The objective of this document is to provide the purchasers and users of coin secondary lithium
141 cells and batteries with a set of criteria with which they can assess the performance of coin
142 secondary lithium cells and batteries offered by various manufacturers.
143 This document defines a minimum required level of performance and a standardized
144 methodology by which testing is performed and the results of this testing reported to the user.
145 Hence, users will be able to establish the viability of commercially available cells and batteries
146 via the declared specification and thus be able to select the cell or battery best suited for their
147 intended application.
148 This document covers coin secondary lithium cells and batteries with a range of chemistries.
149 Each electrochemical couple has a characteristic voltage range over which , during discharge,
150 it releases its electrical capacity, a characteristic nominal voltage and a characteristic end -of-
151 discharge voltage. Users of coin secondary lithium cells and batteries are requested to consult
152 the manufacturer for advice.
153 This document also provides guidelines for designers of equipment using lithium batteries (see
154 Annex B).
155
156 2 Normative references
157 The following documents are referred to in the text in such a way that some or all of their content
158 constitutes requirements of this document. For dated references, only the edition cited applies.
159 For undated references, the latest edition of the referenced document (including any
160 amendments) applies.
161 IEC 60050-482:2004, International Electrotechnical Vocabulary (IEV) – Part 482: Primary and
162 secondary cells and batteries
163 IEC 62133-2:2017, Secondary cells and batteries containing alkaline or other non-acid
164 electrolytes – Safety requirements for portable sealed secondary cells, and for batteries made
165 from them, for use in portable applications – Part 2: Lithium systems
166 IEC 60086-3:2021, Primary batteries – Part 3: Watch batteries
167 IEC 60086-4:2019, Primary batteries – Part 4: Safety of lithium batteries

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168 3 Terms and definitions
169 For the purposes of this document, the terms and definitions given in IEC 60050-482 and the
170 following apply.
171 ISO and IEC maintain terminological databases for use in standardization at the following
172 addresses:
173 • IEC Electropedia: available at http://www.electropedia.org/
174 • ISO Online browsing platform: available at http://www.iso.org/obp
175 3.1
176 coin cell
177 coin battery
178 lithium button cell
179 lithium button battery
180 small round cell or battery where the overall height is less than the diameter, containing
181 non­aqueous electrolyte
182 [SOURCE: IEC 60086-4:2019, 3.3]
183 3.2
184 secondary lithium cell
185 secondary cell whose electrical energy is derived from oxidation and the reduction of lithium
186 Note 1 to entry: This cell is not ready for use in an application because it is not yet fitted with its final housing,
187 terminal arrangement and electronic control device.
188 3.3
189 secondary lithium battery
190 unit which incorporates one or more secondary lithium cells and which is ready for use
191 Note 1 to entry: This unit incorporates adequate housing and a terminal arrangement and may have electronic
192 control devices.
193 3.4
194 nominal voltage
195 suitable approximate value of voltage used to designate or identify a cell, or a battery
196 Note 1 to entry: The nominal voltages of coin secondary lithium cells are shown in Table 1.
197 [SOURCE: IEC 60050-482:2004, 482-03-31, modified – "electrochemical system" has been
198 omitted from the definition and the note has been added.]
199 3.5
200 rated capacity
201 quantity of electricity mAh (milliampere-hours) that a single cell or battery can deliver, when
202 charged, stored and discharged under specified conditions and declared b y the manufacturer
203 3.6
204 end-of-charge voltage
205 voltage attained at the end of a charging step, at a specified constant current or a specified
206 constant resistance
207 Note 1 to entry: The end-of-charge voltage may be used to initiate the termination of the charge process.
208 [SOURCE: IEC 60050-482:2004, 482-05-55, modified – "or a specified constant resistance" has
209 been added to the definition.]

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210 3.7
211 end-of-discharge voltage
212 specified closed circuit voltage at which a discharge of a cell or battery is terminated
213 [SOURCE: IEC 60050-482:2004, 482-03-30, modified – The synonyms "final voltage", "cut-off
214 voltage", and "end-point voltage" have been omitted and the words "closed circuit" and "cell"
215 have been added to the definition.]
216 3.8
217 charge recovery
218 capacity recovery
219 capacity that a cell or battery can deliver with subsequent recharge, after storage at a specific
220 temperature, for a specific time, as a percentage of the rated capacity
221 4 Parameter measurement tolerances
222 The overall accuracy of controlled or measured values, relative to the specified or actual values,
223 shall be within the following tolerances:
224 a) ±1 %  for voltage;
225 b) ±1 %  for current;
226 c) ±1 %  for capacity;
227 d) ±2 °C for temperature;
228 e) ±0,1 % for time;
229 f) ±0,1 mm for dimensions.
230 These tolerances comprise the combined accuracy of the measuring instruments, the
231 measurement techniques used, and all other sources of error in the test procedure.
232 The details of the instrumentation used shall be provided in any report of results.
233 5 Cell designation and marking
234 5.1 Cell designation
235 Cells shall be designated with the following form:
236 A A DDHH
1 2
237 where
238 A designates the positive electrode system in which:
1
239 C or U is lithium cobalt oxide;
240 FP is lithium iron phosphate;
241 M is lithium manganese oxide;
242 N is lithium nickel oxide;
243 NB is niobium oxide;
244 V is vanadium oxide;
245 T is lithium titanium oxide.
246 A designates the negative electrode system in which:
2

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247 C is carbon;
248 L is lithium aluminium alloy;
249 S is lithium silicon oxide/alloy;
250 T or TL is lithium titanium oxide;
251 DD designates the diameter in mm;
252 HH designates the height in 1/10 of mm.
253 The requirements concerning code letters on electrochemical systems are given in Table 1.
254 Table 1 – Electrochemical systems in current practical use
Nominal
voltage
Positive electrode Electrolyte Negative electrode Code letters
(V)
Lithium transition metal
3,6 to
a
(cobalt, manganese, Carbon
UC or MC or NC
3,9
nickel) oxide
Lithium iron phosphate Carbon 3,2 FPC
Lithium cobalt oxide Lithium titanium oxide 3,0 UT
Vanadium oxide Lithium aluminium alloy 3,0 VL
Lithium manganese oxide Lithium aluminium alloy 3,0 ML
Non-aqueous
solution with
Lithium manganese oxide Lithium silicon oxide/alloy 3,0 MS
lithium salt
Lithium cobalt oxide Lithium titanium oxide 2,3 CTL
Niobium oxide Lithium aluminium alloy 2,0 NBL
Lithium manganese oxide Lithium titanium oxide 1,5 MT
Lithium titanium oxide Lithium-carbon compound 1,5 TC
Lithium titanium oxide Lithium aluminium alloy 1,5 TL
Lithium titanium oxide Lithium silicon oxide 1,5 TS
The above code letters are given as examples. Each positive electrode and negative electrode shall be designated with
one or two letters. Any code letter can be decided on by agreement between the manufacturer and user when there is a
same chemistry which has different nominal voltages.
a
  For lithium transition metal oxide positive electrodes, the symbols for the highest element composition of cobalt,
manganese or nickel shall be used. (e.g., the symbol for a lithium transition metal oxide with a composition of
LiNi Mn Co O is N.)
0.6 0.2 0.2 2
255
256
257 Key
258 h overall height of the cell
259 d diameter of the cell
260 Figure 1 – Dimensional characteristics

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261 Coin secondary lithium cells complying with this document shall be designated by the following
262 system consisting of code letters and numbers. For the electrochemical systems, the code
263 letters shall be expressed using two letters (a maximum of three letters), followed by diameter
264 and height expressed in that order. See Figure 1.
265 EXAMPLE                                   ML1220
266
267 Electrochemical system code letters
268 according to Table 1
269 Dimensions: d in millimetres
270 Dimensions: h in 1/10 of millimetres
271 Notwithstanding the above specification, other designations can be used according to an
272 agreement between manufacturer and user.
273 5.2 Marking
274 5.2.1 General
275 With the exception of swallowable cells or batteries (see 5.2.2), each the following information
276 shall be marked:
277 a) cell designation, IEC or common;
278 b) the year and month or week of manufacture (may be given in code);
279 c) polarity of the positive (+) terminal;
280 d) nominal voltage;
281 e) rated capacity;
282 f) name or trademark of the manufacturer or supplier;
283 g) cautionary advice;
284 h) combination of "secondary (rechargeable)" and "Li", or "secondary (rechargeable)" and "Li-
285 ion".
286 The designation a) and the polarity c) shall be marked on the cell or battery.
287 For cells or batteries with an internal AC resistance less than or equal to 3 Ω, intended to be
288 user replaceable or not contained in the equipment, the additional marking of h) shall be marked
289 on the cell or battery.
290 Other information shall be either marked on the cell or battery, provided in the specification
291 sheet or instruction manual, or marked on the immediate package.
292 5.2.2 Swallowable cells or batteries
293 For cells or batteries that fit entirely within the ingestion gauge (Figure 3 in IEC 62133­2:2017),
294 the designation specified in 5.2.1 a) and the polarity specified in 5.2.1 c) shall be marked on
295 the cell or battery.
296 For cells or batteries that have a diameter of 16 mm or more intended to be user replaceable
297 or not contained in the equipment, the safety sign KEEP OUT OF REACH OF CHILDREN shall
298 be marked on the cell or battery in accordance with Annex F of IEC 60086-4:2019.
299 For cells or batteries with an internal AC resistance less than or equal to 3 Ω, intended to be
300 user replaceable or not contained in the equipment, the additional marking of 5.2.1 h) shall be
301 marked on the cell or battery.

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302 All other information shown in 5.2.1 and caution for ingestion of swallowable cells and batteries
303 (see IEC 62133-2:2017) should be given in the specification sheet, or in the instruction manual
304 or on the immediate package instead of on the cell or battery.
305 6 Electrical tests
306 6.1 General
307 Only cell or battery samples which are less than two months (60 days) old from the date of
308 manufacture shall be used for the tests specified in this document.
309 Unless otherwise stated in this document, the following tests shall be done in an ambient
310 temperature of 20 °C ± 5 °C.
311 Tested cells or batteries should not exceed the upper limit charge voltage or end-of-discharge
312 voltage limit during the test.
313 Coin secondary lithium cells or batteries have different characteristics and features in terms of
314 voltage, discharge performance, capacity recovery after storage, and cycling depending on their
315 chemistries. Therefore, conditions specified by the manufacturer shall be used in order to make
316 the most of cell or battery characteristics.
317 The sample sizes and the sequence of the tests are described in Figure 2.

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318
319 Figure 2 – Sample sizes and sequence of tests
320 6.2 Charging procedure for test purposes
321 There are two different charging methods for the coin secondary lithium cells or batteries:
322 constant voltage charge and constant current charge. The charge method and conditions
323 specified by the manufacturer shall be used. The charge voltage in Table 2 are generally used
324 upper limits, and some manufacturers allow higher values. Contact each manufacturer for
325 details.
326

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