oSIST prEN IEC 62620:2026

SLOVENSKI STANDARD
01-marec-2026
Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti -
Sekundarni litijevi členi in baterije za industrijsko uporabo
Secondary cells and batteries containing alkaline or other non-acid electrolytes -
Secondary lithium cells and batteries for use in industrial applications
Akkumulatoren und Batterien mit alkalischen oder anderen nichtsäurehaltigen
Elektrolyten - Lithium-Akkumulatoren und -batterien für industrielle Anwendungen
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Eléments et
batteries d'accumulateurs au lithium pour utilisation dans les applications industrielles
Ta slovenski standard je istoveten z: prEN IEC 62620:2026
ICS:
29.220.30 Alkalni sekundarni členi in Alkaline secondary cells and
baterije batteries
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

21A/958/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62620 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-23 2026-04-17
SUPERSEDES DOCUMENTS:
21A/914/CD, 21A/927A/CC
IEC SC 21A : SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR OTHER NON-ACID ELECTROLYTES
SECRETARIAT: SECRETARY:
France Mr Jean-Marie Bodet
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
TC 21
ASPECTS CONCERNED:
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.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to be
included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses. (SEE
AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Secondary cells and batteries containing alkaline or other non-acid electrolytes – Secondary lithium cells and
batteries for use in industrial applications
PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
The resolution of comments (21A/927/CC) was presented and accepted during the IEC SC 21A WG 5 Fall Meeting held in
Washington on 2025-10-28 (please refer to 21A/927A/CC). The committee draft for vote has been prepared in OSD and is
now proposed to enter the voting and comment phase.
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IEC 62620 © IEC 2026
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IEC 62620 © IEC 2026
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameters measurement tolerances . 10
5 Marking and designation . 11
5.1 Marking . 11
5.2 Cell designation . 12
5.3 Battery designation . 14
5.3.1 General . 14
5.3.2 Battery structure formulation . 15
5.4 Cell or battery termination . 16
6 Electrical tests . 16
6.1 General . 16
6.2 Charging procedure for test purposes . 16
6.3 Discharge performance . 17
6.3.1 Discharge performance at +25 °C . 17
6.3.2 Discharge performance at low temperature . 17
6.3.3 High rate permissible current . 18
6.4 Charge (capacity) retention and recovery . 19
6.4.1 General . 19
6.4.2 Test method . 19
6.4.3 Acceptance criteria . 19
6.5 Cell and battery internal resistance . 19
6.5.1 General . 19
6.5.2 Measurement of the internal a.c. resistance . 20
6.5.3 Measurement of the internal d.c. resistance . 20
6.6 Endurance . 21
6.6.1 Endurance in cycles . 21
6.6.2 Endurance in storage at constant voltage (permanent charge life) . 22
7 Type test conditions . 23
7.1 General . 23
7.2 Sample size . 24
7.3 Conditions for type approval . 25
7.3.1 Dimensions . 25
7.3.2 Electrical tests . 25
Annex A (informative) Battery structure information . 27
A.1 Example 1 . 27
A.2 Example 2 . 27
A.3 Example 3 . 27
A.4 Example 4 . 27
A.5 Example 5 . 28
A.6 Example 6 . 28
A.7 Example 7 . 29
A.8 Example 8 . 29
A.9 Example 9 . 30
IEC 62620 © IEC 2026
Annex B (informative) Relative state of health R-SOH . 31
B.1 General . 31
B.2 Variables related to R-SOH . 31
B.3 R-SOH according to the percentage of residual values . 32
B.4 Method of measurement of R-SOH . 32
B.4.1 Measurement of X (Capacity in Ah) . 33
B.4.2 Measurement of X (Energy in Wh) . 33
B.4.3 Measurement of X (Power in W) . 33
B.4.4 Measurement of X (RoundTrip efficiency) . 33
B.4.5 Measurement of X (Internal resistance) . 33
B.5 When does R-SOH is measured? . 34
Annex C (informative) Absolute state of health A-SOH . 35
C.1 General . 35
C.2 Variables related to A-SOH . 36
C.3 A-SOH according to the percentage of residual values . 37
C.4 Method of measurement of A-SOH . 37
C.4.1 Measurement of Y : Capacity in Ah . 37
C.4.2 Measurement of Y : the internal soft short-circuit degree . 37
C.4.3 Measurement of Y : the aging of the protection safety components of
the battery . 38
C.4.4 Measurement of Y : the number of closing/opening under load of the
electromagnetic relays . 38
C.4.5 Measurement of Y : the age of the cell . 38
C.4.6 Measurement of Y : the dimension of the cell including thickness for
prismatic cells . 38
C.4.7 Measurement of Y : the abnormal appearance of the cell deformation,
leakage, discoloration, corrosion on surfaces . 38
C.4.8 Measurement of Y : the Operation Safety Digit (OSD) . 39
C.5 When does A-SOH is measured? . 39
Annex D (informative) Durability . 40
D.1 General . 40
Bibliography . 41

Figure 1 – Figure 1 Examples of BMS locations and battery system configurations . 10
Figure 2 – Test sequence . 24
Figure A.1 – Structure 3S . 27
Figure A.2 – Structure 2P . 27
Figure A.3 – Structure 3S2P . 27
Figure A.4 – Structure 2P4S . 28
Figure A.5 – Structure 2P4S3P . 28
Figure A.6 – Structure (2P4S)3P . 29
Figure A.7 – Structure (3S2P)3P . 29
Figure A.8 – Structure (5S)4S . 30
Figure A.9 – Structure ((3S2P)3P)2S . 30

IEC 62620 © IEC 2026
Table 1 – Marking . 11
Table 2 – Test conditions and criteria of discharge performance at +25 °C . 17
Table 3 – Test condition and criteria of discharge performance at low temperature . 18
Table 4 – Discharge current values for high rate permissible test . 18
Table 5 – Constant discharge current used for measurement of the internal d.c.
resistance . 21
Table 6 – Type test . 24
Table 7 – Severe conditions . 25

IEC 62620 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Secondary cells and batteries
containing alkaline or other non-acid electrolytes –
Secondary lithium cells and batteries for use in industrial applications

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) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC [had/had not] received notice of (a) patent(s), which may be required to implement this
IEC 62620 © IEC 2026
document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at https://patents.iec.ch.
IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62620 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. It is an International Standard.
This second edition cancels and replaces the first edition published in 2014, Amendment
1:[publication_date] and Amendment 2:[publication_date]. This edition constitutes a technical
revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) .;
The text of this International Standard is based on the following documents:
Draft Report on voting
XX/XX/FDIS XX/XX/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English [change
language if necessary].
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 62620 © IEC 2026
INTRODUCTION
The following items were listed in the bibliography but not cited in the text. Please find a suitable
place to cite them to justify their inclusion in the bibliography:
IEC 60051 (all parts), Direct acting indicating analogue electrical measuring instruments and
their accessoriesIEC 60051 (all parts) [1]
IEC 60485, Digital electronic d.c. voltmeters and d.c. electronic analogue-to-digital
convertorsIEC 60485 [2]
IEC 61960, Secondary cells and batteries containing alkaline or other non-acid electrolytes -
Secondary lithium cells and batteries for portable applicationsIEC 61960 [3]
IEC 62620 © IEC 2026
1 Scope
This International Standard specifies marking, tests and requirements for lithium secondary
cells and batteries used in industrial applications including stationary applications.
When there exists an IEC standard specifying test conditions and requirements for cells used
in special applications and which is in conflict with this standard, the former takes precedence.
(e.g. IEC 62660 (all parts) [4] on road vehicles).
The following are some examples of applications that utilize the cells and batteries under the
scope of this standard.
– Stationary applications: telecom, uninterruptible power supplies (UPS), electrical energy
storage system (EESS), utility switching, emergency power and similar applications.
– Motive applications: fork-lift truck, golf cart, automated guide vehicle (AGV), railway, and
marine, excluding road vehicles.
Applications excluded from the portable use specified in the scope of IEC 61960-3.
NOTE EESS and UPS, which use batteries with electrical energy equal or lower than 500 Wh are excluded.
Since this standard covers batteries for various industrial applications, it includes those
requirements, which are common and minimum to the various applications.
This document addresses first life cells and batteries. Reuse, repurpose, second life use or
similar are not taken into consideration by this document.
Refer IEC 63330-1:2024 for second life batteries.
This document helps to clarify the concept of health, state of health and durability of secondary
lithium industrial cells and batteries. See Annex B and Annex C.
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 62619:2022, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Safety requirements for secondary lithium cells and batteries, for use in industrial
applications
IEC 63330-1:2024, Repurposing of secondary batteries - Part 1: General requirements
ISO/IEC Guide 51, Safety aspects - Guidelines for their inclusion in standards
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482:2004,
ISO/IEC Guide 51 and the following apply.
IEC 62620 © IEC 2026
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
charge recovery
capacity recovery
capacity that a cell or battery can deliver after the charge following the charge retention test
Note 1 to entry: Charge retention is defined in 3.2 (3.2).
3.2
charge retention
capacity retention
capacity that a cell or battery can deliver after storage, at a specific temperature, for a specific
time without subsequent recharge as a percentage of the rated capacity
3.3
final voltage
end-of-discharge voltage
specified closed circuit voltage at which the discharge of a cell or battery is terminated
3.4
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell or a battery
Note 1 to entry: The cell or battery manufacturer may provide the nominal voltage.
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.
[SOURCE: IEC 60050-482:2004, 482-03-31, modified - Addition of Notes 1 and 2 to entry.]
3.5
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 Cn Ah (ampere-hours) declared by the manufacturer
which a single cell or battery can deliver during a n h period when charging, storing and discharging under the
conditions specified in 7.3.1. n is 5 for an E, M and H discharge rate type cell or battery. n is 8, 10, 20 or 240 for an
S discharge rate type battery.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified - Addition of Note 1 to entry.]
3.6
cell
secondary lithium cell
secondary cell where electrical energy is derived from the insertion and extraction reactions of
lithium ions or oxidation and reduction reaction of lithium between the negative electrode and
the positive electrode
Note 1 to entry: A secondary cell is a manufactured unit providing a source of electrical energy by direct conversion
of chemical energy. The cell consists of electrodes, electrolyte, container, terminals and, if any, separators. The
electrode can be monopolar or bipolar; the current collector of the former has active material of single polarity and
latter has positive and negative electrode active materials. The electrolyte includes an ionic conductive liquid or
solid, or mixture of them. The cell is designed to be charged electrically.
IEC 62620 © IEC 2026
3.7
cell block
group of cells connected together in parallel configuration with or without protective devices
(e.g. fuse or positive temperature coefficient device (PTC)) and monitoring circuitry
Note 1 to entry: The cell block is not ready for use in an application because it is not yet fitted with its final housing,
terminal arrangement and electronic control device.
3.8
module
group of cells connected together either in a series and/or parallel configuration with or without
protective devices (e.g. fuse or PTC) and monitoring circuitry
3.9
battery pack
energy storage device, which comprises one or more cells or modules electrically connected
and has monitoring circuitry which provides information (e.g. cell voltage) to a battery system
to influence the battery 's safety, performance and/or service life
Note 1 to entry: The battery pack may incorporate a protective housing and be provided with terminals or other
interconnection arrangements.
3.10
battery system
battery
system which comprises one or more cells, modules or battery packs and has a battery
management system capable of controlling current in case of overcharge, overcurrent,
overdischarge, and overheating
Note 1 to entry: Overdischarge cut-off is not mandatory if there is an agreement between the cell manufacturer and
the customer.
Note 2 to entry: The battery system may have cooling or heating units. More than one battery system may constitute
a larger battery system. The battery system is sometimes also referred to as a battery.
3.11
battery management system
BMS
electronic system associated with a battery which has functions to control current in case of
overcharge, overcurrent, overdischarge, and overheating and which monitors and/or manages
the battery's state, calculates secondary data, reports that data and/or controls its environment
to influence the battery 's safety, performance and/or service life
Note 1 to entry: Overdischarge cut-off is not mandatory if there is an agreement between the cell manufacturer and
the customer.
Note 2 to entry: The function of the BMS (3.11) can be assigned to the battery pack or to equipment that uses the
battery. (See Figure 1)
IEC 62620 © IEC 2026
a) Figure 1.a All functions of BMS are in the battery b) Figure 1.b BMS functions are divided between
pack battery pack and equipment side

c) Figure 1.c Combination of equipment with BMS d) Figure 1.d Equipment includes all BMS functions
and modules and cell(s)
Figure 1 – Figure 1 Examples of BMS locations and battery system configurations

Note 3 to entry: The BMS (3.11) can be divided and it can be found partially in the battery pack and partially on the
equipment that uses the battery. (See Figure 1)
Note 4 to entry: The BMS (3.11) is sometimes also referred to as a BMU (battery management unit).
4 Parameters measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual values,
shall be within the following tolerances:
a) ±0,5 % for voltage;
b) ±1 % for current;
c) ±2 °C for temperature;
d) ±0,1 % for time;
e) ±1 % for dimensions.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used, and all other sources of error in the test procedure.
IEC 62620 © IEC 2026
The details of the instrumentation used shall be provided in any report of results.
5 Marking and designation
5.1 Marking
The marking items shown in Table 1 are indicated on the cell, battery system or instruction
manual. When marked on the cell or battery system, each cell or battery system that is installed
or maintained shall carry clear and durable markings giving the information.
The following options are allowed:
– if there are markings on a battery system, markings are not necessary on the battery pack,
module or cell inside the battery system;
– if there are markings on a battery pack, markings are not necessary on the module and cell
inside the battery pack;
– if there are markings on a module, markings are not necessary on the cell inside the module.
However, for a transportable unit (i.e. a unit that is being shipped), it is necessary to provide
the marking information on the main transportable unit or in its instruction manual. Furthermore,
if there is a marking matter of arrangement between the purchaser and the manufacturer, it
shall comply with the agreement.
Each cell or battery that is installed or maintained shall carry clear and durable markings giving
the following information:
– secondary (rechargeable) Li or Li-ion;
– polarity;
– Year and either day with month, week or month of manufacture (which may be in code);
– name or identification of manufacturer or supplier;
– rated capacity;
– nominal voltage;
– appropriate caution statement.
Polarity can be deleted if the battery has been exclusively designed not to be connected wrongly
and there is an agreement between the cell or battery manufanufacturer and the customer.
The model name and manufacturing traceability shall be marked on the cell and battery surface.
The other items listed above can be marked on the smallest package or supplied with the cell
or the battery.
The following information shall be marked on or supplied with the cell or the battery:
– disposal instructions;
– recommended charge instructions.
The following information shall be marked on the cell or when there is no marking place on the
cell, it shall be marked in the manual.
– cell designation as specified in 6.2.
Table 1 – Marking
Marking information Cell Cell block, Module or Battery
Battery pack system
Secondary (rechargeable) Li or Li-ion R R R
IEC 62620 © IEC 2026
Marking information Cell Cell block, Module or Battery
Battery pack system
Polarity (see Table 1, Note 1) R R R
Year and either day with month, week or month of manufacture R R R
(which may be in code)
Name or identification of manufacturer or supplier R R a
R
Rated capacity R R b
R
c -- -- R
Calculated rated capacity
c -- -- R
Calculating method for rated capacity
Nominal voltage R R R
Watt-hour* (see Table 1, Note 2) V V V
Appropriate caution statement (Including disposal instructions) R R R
Cell designation as specified in 5.2 R -- --
Battery designation as specified in 5.3 -- R R
Recommended charge instructions R R R
"R" = required; "V" = voluntary, "--" = unnecessary or not applicable
For example:
Measured rated capacity of module: 10 Ah
Number of modules connected in parallel: 5
Calculated rated capacity (Ah) ＝ 10 Ah × 5 ＝ 50 Ah
NOTE 1 There is an exception, see 6.1.
NOTE 2 Watt-hour (Wh) designation on cell, module, battery pack or battery system is the rated capacity (Ah)
c
or calculated rated capacity (Ah) as defined in table footnote multiplied by the nominal voltage of the cell,
module, battery pack or battery system according to the following formula:
Watt-hour (Wh) ＝Rated capacity (Ah) or Calculated rated capacity (Ah) × Nominal voltage (V)
a
It is necessary to mark designations on the main battery system.
b
Tested by main battery system; shall be indicated on the main battery system.
c
If evaluated by testing the split unit of a battery system; it shall be indicated as the rated capacity and shall be
the amount calculated by a reasonable method.
5.2 Cell designation
Cells shall be designated with following form:
𝐴𝐴𝐴𝐴𝐴𝐴𝑁𝑁 /𝑁𝑁 /𝑁𝑁 /𝐴𝐴 /𝑇𝑇𝑇𝑇 /𝑁𝑁 (1)
1 2 3 2 3 4 4 𝐿𝐿 𝐻𝐻 𝐶𝐶
where
A designates the negative electrode basis in which:
I is carbon;
T is titanium;
L is lithium metal or lithium alloy;
IEC 62620 © IEC 2026
X is other material.
A designates the positive electrode basis in which:
C is cobalt;
F is iron;
Fp is iron phosphate;
N is nickel;
M is manganese;
Mp is manganese phosphate;
V is vanadium;
X is other material.
A designates the shape of the cell in which:
R is cylindrical;
P is prismatic (including cell with laminate film case).

A designates the rate capability of the cell in which:
E is low rate long-time discharge type;
M is medium rate discharge type;
H is high rate discharge type.

NOTE 1 These types of cells are typically but not exclusively used for the following discharge rates at +25 °C:
– E up to 0,5 I A,
t
– M up to 3,5 I A,
t
– H above 3,5 I A.
t
NOTE 2 These currents are expressed as multiples of I A, where I A = C Ah/1 h (IEC 61434 [5]).
t t 5
T is the low temperature grade defined in6.3.2. The information shall be indicated by the
L
sign + or - followed by the temperature value in °C at 10 °C intervals (e.g. −30, 0, +10);
T is the high temperature grade defined in6.6.2 . The information shall be indicated by the
H
sign + or - followed by the temperature value in °C at 10 °C intervals (e.g. +40, +50) If
a cell is designed only for cycle application, T should be mentioned as "NA";
H
N is the percentage (rounded down to every 5 % step) obtained by the ratio of capacity at
C
500 cycles by the rated capacity. Refer to 6.3.1 and 6.6.1. If a cell is designed only for
stand-by application, N should be mentioned as "NA";
C
N is the maximum diameter (if R) or the maximum thickness (if P) in mm rounded up to the
next whole number;
N is the maximum width (if P) in mm rounded up to the next whole number (N not shown
3 3
if R);
N is the maximum overall height in mm rounded up to the next whole number.
NOTE 3 If any dimension is less than 1 mm, the units used are tenths of millimetres and the single number is written
tN such as "t1" for 0,1 mm.
EXAMPLE 1 INR54/222/H/-20+50/70 would designate a cylindrical Li-ion secondary cell, with a nickel-based
positive electrode. Its maximum diameter is between 53 mm and 54 mm, and its overall height is between 221 mm
and 222 mm. It is designed for high discharge rate. Its low temperature grade is −20 °C. Its high temperature grade
IEC 62620 © IEC 2026
is 50 °C. It applies for both cycle and stand-by application. Its capacity retention after 500 cycles to rated capacity
is between 70 % and 74 %.
EXAMPLE 2 ICP25/150/150/E/0+60/60 would designate a prismatic Li-ion secondary cell, with a cobalt-based
positive electrode. Its maximum thickness is between 24 mm and 25 mm, its maximum width is between 149 mm and
150 mm, and its overall height is between 149 mm and 150 mm. It is designed for low discharge rate over a long
period. Its low temperature grade is 0 °C. Its high temperature grade is 60 °C. It applies for both cycle and stand-by
application. Its capacity after 500 cycles to rated capacity is between 60 % and 64 %.
EXAMPLE 3 INR50/150/M/-30NA/75 would designate a cylindrical Li-ion secondary cell, with a nickel-based
positive electrode. Its maximum diameter is between 49 mm and 50 mm, and its overall height is between 149 mm
and 150 mm. It is designed for medium discharge rate. Its low temperature grade is −30 °C. Its high temperature
grade is NA. It applies for cycle application only. Its capacity retention after 500 cycles to rated capacity is between
75 % and 79 %.
EXAMPLE 4 IMP50/240/150/M/-30+10/NA would designate a prismatic Li-ion secondary cell, with a manganese-
based positive electrode. Its maximum thickness is between 49 mm and 50 mm, its maximum width is between 239
mm and 240 mm, and its overall height is between 149 mm and 150 mm. It is designed for a medium discharge rate.
Its low temperature grade is −30 °C. Its high temperature grade is 10 °C. It applies for stand-by application only.
5.3 Battery designation
5.3.1 General
Batteries shall be designated with following form:
𝐴𝐴𝐴𝐴𝐴𝐴𝑁𝑁 /𝑁𝑁 /𝑁𝑁 [𝑆𝑆 ]𝐴𝐴 /𝑇𝑇𝑇𝑇 /𝑁𝑁 (2)
1 2 3 2 3 4 1 4 𝐿𝐿 𝐻𝐻 𝐶𝐶
where
A designates the negative electrode basis in which:
I is carbon;
T is titanium;
L is lithium metal or lithium alloy;
X is other materials.
A designates the positive electrode basis in which:
C is cobalt;
F is iron;
Fp is iron phosphate
N is nickel;
M is manganese;
Mp is manganese phosphate;
V is vanadium;
X is other materials.
A designates the shape of the cell in which:
R is cylindrical;
P is prismatic (including cell with laminate film case).

A designates the rate capability of the battery in which
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S is very low rate long-time discharge type;
E is low rate long-time discharge type;
M is medium rate discharge type;
H is high rate discharge type.

NOTE 1 These types of batteries are typically but not exclusively used for the following discharge rates at +25 °C.
– S up to 0,125I A,
t
– E up to 0,5 I A,
t
– M up to 3,5 I A,
t
– H above 3,5 I A.
t
T is the low temperature grade defined in 6.3.2 . The information shall be indicated by the
L
sign + or - followed by the temperature value in °C at 10 °C intervals (e.g. −30, 0, +10);
T is the high temperature grade defined in 6.6.2 . The information shall be indicated by
H
the sign + or - followed by the temperature value in °C at 10 °C intervals (e.g. +40, +50)
If a battery is designed only for cycle application, T should be mentioned as "NA".
H
N is the percentage (rounded down to every 5 % step) obtained by the ratio of capacity at
C
500 cycles by the rated capacity. Refer to 6.3.1 and 6.6.1 . If a battery is designed only
for stand-by application, N should be mentioned as "NA".
C
N is the maximum diameter (if R) or the maximum thickness (if P) of the cell inside the
battery in mm rounded up to the next whole number;
N is the maximum width (if P) of the cell inside the battery in mm rounded up to the next
whole number (N not shown if R);
N is the maximum overall height of the cell inside the battery in mm rounded up to the next
whole number;
NOTE 2 If any dimension is less than 1 mm, the units used are tenths of millimetres and the single number
is written tN such as "t1" for 0,1 mm.
S is the battery structure formulation shown in5.3.2 .
EXAMPLE 1 ICP200/150/150[7S] E/0+50/75 would designate a battery composed of 7S connected prismatic Li-ion
secondary cells, with a cobalt-based positive electrode. Its cell maximum thickness is between 199 mm and 200 mm,
its cell maximum width is between 149 mm and 150 mm, and its cell overall height is between 149 mm and 150 mm.
The battery is designed for low discharge rate over a long period. Its low temperature grade is 0 °C. Its high
temperature grade is +50 °C. Its capacity after 500 cycles to rated capacity is between 75 % and 79 %.
EXAMPLE 2 INR54/222[4P3S]H/-20+50/80 would designate a battery composed of 4P-3S connected cylindrical Li-
ion secondary cells, with a nickel-based positive electrode. Its cell maximum diameter is between 53 mm and 54 mm,
and its cell overall height is between 221 mm and 222 mm. The battery is designed for high discharge rate. Its low
temperature grade is −20 °C. Its high temperature grade is +50 °C. Its capacity after 500 cycles to rated capacity is
between 80 % and 84 %.
5.3.2 Battery structure formulation
The battery designation should include the breakdown structure of the battery. The descriptive
path followed to formulate the battery is from the smallest entity to the largest one.
a) It describes the number of cells in the minimum constitutive entity and on the right side of
the number describes their connection mode in series (S) or in parallel (P).
See Figure A.1 and Figure A.2.
b) In case that the minimum constitutive entities are connected in series or in parallel, it
describes the number of the minimum constitutive entities, and on the right side of the
number describes their connection mode in series (S) or in parallel (P).
See Figure A.3 and Figure A.4.
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c) In case of the larger constitutive entities, it describes the symbols on the right side in the
same way as mentioned above.
When some constitutive entities can be divided for ease of handling or transportation, these
entities can be distinguished from other entities by bracketing.
Some examples are shown in Figure A.5 through Figure A.9.
5.4 Cell or battery termination
As for the cell or battery termination which is the end of use of them, refer Annex B and C.
6 Electrical tests
6.1 General
Electrical tests are applied to cells and/or batteries. If a battery system is divided into smaller
units, the unit may be tested as the representative of the battery system.
The manufacturer shall add functi
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