EN IEC 62660-1:2019

SLOVENSKI STANDARD
SIST EN 62660-1:2019
01-maj-2019
1DGRPHãþD
SIST EN 62660-1:2011
6HNXQGDUQLOLWLMLRQVNLþOHQL]DSRJRQHOHNWULþQLKFHVWQLKYR]LOGHO3UHVNXãDQMH
]PRJOMLYRVWL
Secondary lithium-ion cells for the propulsion of electric road vehicles - Part 1:
Performance testing
Lithium-Ionen-Sekundärzellen für den Antrieb von Elektrostraßenfahrzeugen - Teil 1:
Prüfung des Leistungsverhaltens
Eléments d'accumulateurs lithium-ion pour la propulsion des véhicules routiers
électriques - Partie 1: Essais de performance
Ta slovenski standard je istoveten z: EN IEC 62660-1:2019
ICS:
29.220.20 .LVOLQVNLVHNXQGDUQLþOHQLLQ Acid secondary cells and
EDWHULMH batteries
43.120 (OHNWULþQDFHVWQDYR]LOD Electric road vehicles
SIST EN 62660-1:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 62660-1:2019
SIST EN 62660-1:2019
EUROPEAN STANDARD EN IEC 62660-1

NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 29.220.20; 43.120 Supersedes EN 62660-1:2011
English Version
Secondary lithium-ion cells for the propulsion of electric road
vehicles - Part 1: Performance testing
(IEC 62660-1:2018)
Eléments d'accumulateurs lithium-ion pour la propulsion Lithium-Ionen-Sekundärzellen für den Antrieb von
des véhicules routiers électriques - Partie 1: Essais de Elektrostraßenfahrzeugen - Teil 1: Prüfung des
performance Leistungsverhaltens
(IEC 62660-1:2018) (IEC 62660-1:2018)
This European Standard was approved by CENELEC on 2019-01-16. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62660-1:2019 E

SIST EN 62660-1:2019
European foreword
The text of document 21/975/FDIS, future edition 2 of IEC 62660-1, prepared by IEC/TC 21
"Secondary cells and batteries" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62660-1:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-10-16
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-01-16
document have to be withdrawn
This document supersedes EN 62660-1:2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62660-1:2018 was approved by CENELEC as a European
Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 62660-2 NOTE Harmonized as EN 62660-2
IEC 62660-3 NOTE Harmonized as EN 62660-3
IEC 61434:1996 NOTE Harmonized as EN 61434:1996 (not modified)

SIST EN 62660-1:2019
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
ISO/TR 8713 -  Electrically propelled road vehicles - Vocabulary - -

SIST EN 62660-1:2019
SIST EN 62660-1:2019
IEC 62660-1 ®
Edition 2.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary lithium-ion cells for the propulsion of electric road vehicles –
Part 1: Performance testing
Éléments d’accumulateurs lithium-ion pour la propulsion des véhicules routiers
électriques –
Partie 1: Essais de performance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20; 43.120 ISBN 978-2-8322-6288-7
SIST EN 62660-1:2019
– 2 – IEC 62660-1:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Test conditions . 8
4.1 General . 8
4.2 Measuring instruments . 9
4.2.1 Range of measuring devices . 9
4.2.2 Voltage measurement . 9
4.2.3 Current measurement . 9
4.2.4 Temperature measurements . 9
4.2.5 Other measurements . 10
4.3 Tolerance . 10
4.4 Thermal stabilization . 10
5 Dimension measurement . 10
6 Mass measurement . 12
7 Electrical measurement . 12
7.1 General . 12
7.2 General charge conditions . 12
7.3 Capacity . 12
7.4 SOC adjustment . 13
7.5 Power . 13
7.5.1 General . 13
7.5.2 Test method . 13
7.5.3 Calculation of power density . 14
7.5.4 Calculation of regenerative power density . 15
7.6 Energy . 15
7.6.1 General . 15
7.6.2 Test method . 16
7.6.3 Calculation of energy density . 16
7.7 Storage test . 17
7.7.1 General . 17
7.7.2 Charge retention test . 17
7.7.3 Storage life test . 18
7.8 Cycle life test . 18
7.8.1 General . 18
7.8.2 BEV cycle test . 18
7.8.3 HEV cycle test . 22
7.9 Energy efficiency test . 26
7.9.1 General . 26
7.9.2 Common tests for BEV and HEV applications . 26
7.9.3 Test for cells of BEV application . 28
7.9.4 Energy efficiency calculation for cells of HEV application . 29
Annex A (informative) Selective test conditions . 31
Annex B (informative) Cycle life test sequence . 33

SIST EN 62660-1:2019
IEC 62660-1:2018 © IEC 2018 – 3 –
Annex C (informative) Current-voltage characteristic test . 36
C.1 General . 36
C.2 Test method . 36
Bibliography . 39

Figure 1 – Example of temperature measurement of cell . 9
Figure 2 – Examples of maximum dimensions of cell . 11
Figure 3 – Dynamic discharge profile A for BEV cycle test . 20
Figure 4 – Dynamic discharge profile B for BEV cycle test . 22
Figure 5 – Discharge-rich profile for HEV cycle test . 24
Figure 6 – Charge-rich profile for HEV cycle test. 25
Figure 7 – Typical SOC swing by combination of two profiles for HEV cycle test . 26
Figure B.1 – Test sequence of BEV cycle test . 34
Figure B.2 – Concept of BEV cycle test . 35
Figure C.1 – Test order of the current-voltage characteristic test . 37

Table 1 – Discharge conditions . 12
Table 2 – SOC and temperature condition for power test . 13
Table 3 – Dynamic discharge profile A for BEV cycle test . 20
Table 4 – Dynamic discharge profile B for BEV cycle test . 21
Table 5 – Discharge-rich profile for HEV cycle test . 24
Table 6 – Charge-rich profile for HEV cycle test . 25
Table A.1 – Capacity test conditions . 31
Table A.2 – Power test conditions . 31
Table A.3 – Cycle life test conditions . 31
Table A.4 – Conditions for energy efficiency test for BEV application . 32
Table B.1 – Test sequence of HEV cycle test . 35
Table C.1 – Charge and discharge current for the current-voltage characteristic test . 36

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY LITHIUM-ION CELLS FOR
THE PROPULSION OF ELECTRIC ROAD VEHICLES –

Part 1: Performance testing
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) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62660-1 has been prepared by IEC technical committee 21:
Secondary cells and batteries.
This second edition cancels and replaces the first edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The purpose of each test has been added.
b) The power test has been revised for clarification, and an informative part of the current-
voltage characteristic test has been moved to the new Annex C.

SIST EN 62660-1:2019
IEC 62660-1:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
21/975/FDIS 21/985/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.
A list of all the parts in the IEC 62660 series, published under the general title Secondary
lithium-ion cells for the propulsion of electric road vehicles, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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– 6 – IEC 62660-1:2018 © IEC 2018
INTRODUCTION
The commercialization of electric road vehicles including battery, hybrid and plug-in hybrid
electric vehicles has been accelerated in the global market, responding to the global concerns
on CO reduction and energy security. This, in turn, has led to rapidly increasing demand for
high-power and high-energy-density traction batteries. Lithium-ion batteries are estimated to
be one of the most promising secondary batteries for the propulsion of electric vehicles. In the
light of the rapid spread of hybrid electric vehicles and the emergence of battery and plug-in
hybrid electric vehicles, a standard method for testing performance requirements of lithium-
ion batteries is indispensable for securing a basic level of performance and obtaining
essential data for the design of vehicle systems and battery packs.
This document specifies performance testing for automobile traction lithium-ion cells that
basically differ from the other cells including those for portable and stationary applications
specified by other IEC standards. For automobile application, it is important to note the usage
specificity; i.e. the design diversity of automobile battery packs and systems, and specific
requirements for cells and batteries corresponding to each of such designs. Based on these
facts, the purpose of this document is to provide a basic test methodology with general
versatility, which serves a function in common primary testing of lithium-ion cells to be used in
a variety of battery systems.
This document is associated with ISO 12405-4 [1] .
IEC 62660-2 [2] specifies the reliability and abuse testing for lithium-ion cells for electric
vehicle application.
IEC 62660-3 [3] specifies the safety requirements of lithium-ion cells for electric vehicle
application.
___________
Numbers in square brackets refer to the Bibliography.

SIST EN 62660-1:2019
IEC 62660-1:2018 © IEC 2018 – 7 –
SECONDARY LITHIUM-ION CELLS FOR
THE PROPULSION OF ELECTRIC ROAD VEHICLES –

Part 1: Performance testing
1 Scope
This part of IEC 62660 specifies performance and life testing of secondary lithium-ion cells
used for propulsion of electric vehicles including battery electric vehicles (BEV) and hybrid
electric vehicles (HEV).
NOTE 1 Secondary lithium-ion cell used for propulsion of plug-in hybrid electric vehicle (PHEV) can be tested by
the procedure either for BEV application or HEV application, according to the battery system design, based on the
agreement between the cell manufacturer and the customer.
This document specifies the test procedures to obtain the essential characteristics of lithium-
ion cells for vehicle propulsion applications regarding capacity, power density, energy density,
storage life and cycle life.
This document provides the standard test procedures and conditions for testing basic
performance characteristics of lithium-ion cells for vehicle propulsion applications, which are
indispensable for securing a basic level of performance and obtaining essential data on cells
for various designs of battery systems and battery packs.
NOTE 2 Based on the agreement between the cell manufacturer and the customer, specific test conditions can be
selected in addition to the conditions specified in this document. Selective test conditions are described in Annex A.
NOTE 3 The performance tests for the electrically connected lithium-ion cells can be performed with reference to
this document.
NOTE 4 The test specification for lithium-ion battery packs and systems is defined in ISO 12405-4 [1].
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.
ISO/TR 8713, Electrically propelled road vehicles – Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/TR 8713 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp

SIST EN 62660-1:2019
– 8 – IEC 62660-1:2018 © IEC 2018
3.1
battery electric vehicle
BEV
electric vehicle with only a traction battery as power source for vehicle propulsion
3.2
hybrid electric vehicle
HEV
vehicle with both a rechargeable energy storage system and a fuelled power source for
propulsion
3.3
rated capacity
C
n
capacity value of a cell in ampere hours (Ah) determined under specified conditions and
declared by the cell manufacturer
Note 1 to entry: n in C is the time base in hours (h). In this document, n = 3 for BEV application and n = 1 for
n
HEV application unless otherwise specified.
3.4
I
t
reference test current in amperes (A) which is expressed as
I = C / 1
t n
Note 1 to entry: 1 has a dimension of time in hours (h).
Note 2 to entry: See IEC 61434:1996 [4], Clause 2.
3.5
room temperature
temperature of 25 °C ± 2 K
3.6
secondary lithium-ion cell
cell
secondary single cell whose electric energy is derived from the insertion and extraction
reactions of lithium ions between the anode and the cathode
Note 1 to entry: The secondary lithium-ion cell is a basic manufactured unit providing a source of electric energy
by direct conversion of chemical energy. It consists of electrodes, separators, electrolyte, container and terminals,
and is designed to be charged electrically.
3.7
state of charge
SOC
capacity in a cell expressed as a percentage of rated capacity
3.8
charge retention
ability of a cell to retain capacity on open circuit under specified conditions of storage
4 Test conditions
4.1 General
The details of the instrumentation used shall be provided in any report of results.
Test and measurement shall be conducted with caution to prevent a short circuit.

SIST EN 62660-1:2019
IEC 62660-1:2018 © IEC 2018 – 9 –
NOTE Test and measurement can be conducted under fixing condition recommended by the cell manufacturer.
4.2 Measuring instruments
4.2.1 Range of measuring devices
The instruments used shall enable the values of voltage, current and temperature to be
measured. The range of these instruments and measuring methods shall be chosen so as to
ensure the accuracy specified for each test.
For analogue instruments, this implies that the readings shall be taken in the last third of the
graduated scale.
Any other measuring instruments may be used provided they give an equivalent accuracy.
4.2.2 Voltage measurement
The resistance of the voltmeters used shall be at least 1 MΩ/V.
4.2.3 Current measurement
The entire assembly of ammeter, shunt and leads shall be of an accuracy class of 0,5 or
better.
4.2.4 Temperature measurements
The cell temperature shall be measured by use of a surface temperature measuring device
capable of an equivalent scale definition and accuracy of calibration as specified in 4.2.1. The
temperature shall be measured at a location which most closely reflects the cell temperature.
The temperature may be measured at additional appropriate locations, if necessary.
The examples for temperature measurement are shown in Figure 1. The instructions for
temperature measurement specified by the cell manufacturer shall be followed.
Prismatic or flat cell Cylindrical cell

Temperature measuring device
Cell
Cell Cell
Insulating material
IEC
Figure 1 – Example of temperature measurement of cell

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4.2.5 Other measurements
Other values may be measured by use of a measuring device, provided that it complies
with 4.3.
4.3 Tolerance
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within the following tolerances:
a) ± 0,1 % for voltage;
b) ± 1 % for current;
c) ± 2 K for temperature;
d) ± 0,1 % for time;
e) ± 0,1 % for mass;
f) ± 0,1 % for dimensions.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement technique used, and all other sources of error in the test procedure.
4.4 Thermal stabilization
For the stablization of cell temperature, the cell shall be soaked to a specified ambient
temperature for a minimum of 12 h. This period may be reduced if thermal stabilization is
reached. Thermal stabilization is considered to be reached if after one interval of 1 h, the
change of cell temperature is lower than 1 K.
5 Dimension measurement
The maximum dimension of the total width, thickness or diameter, and height of a cell shall be
measured at room temperature up to three significant figures in accordance with the
tolerances in 4.3.
Examples of maximum dimensions are shown in Figures 2a to 2f.

SIST EN 62660-1:2019
IEC 62660-1:2018 © IEC 2018 – 11 –
IEC
IEC
Figure 2a – Cylindrical cell (1) Figure 2b – Cylindrical cell (2)
B
A
A
B
IEC
IEC
Figure 2c – Prismatic cell (1) Figure 2d – Prismatic cell (2)
A A
B
B
IEC
IEC
Figure 2e – Prismatic cell with laminate film case (1) Figure 2f – Prismatic cell with laminate film case (2)

Key
A total width D total height (including terminals)
B total thickness E total height (excluding terminals)
C diameter
Figure 2 – Examples of maximum dimensions of cell
NOTE Prismatic cells are provided with either a rigid metal case or flexible laminate film case. A prismatic cell
with laminate film case is usually called a pouch cell.
The volume of a prismatic cell is given by the product of its total height excluding terminals,
total width, and total thickness, and that of a cylindrical cell is given by the product of the
cross section of the cylinder and its total height excluding terminals.
E
C
E
D
D
E
D
E
D E C
D
D, E
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6 Mass measurement
The mass of a cell is measured at room temperature up to three significant figures in
accordance with the tolerances in 4.3.
7 Electrical measurement
7.1 General
During each test, voltage, current and temperature shall be recorded.
Before each test, the cell temperature shall be stabilized at room temperature according to
4.4, unless otherwise specified.
The ambient temperature shall be the room temperature unless otherwise specified.
7.2 General charge conditions
Unless otherwise stated in this document, prior to electrical measurement test, the cell shall
be charged as follows.
Prior to charging, the cell shall be discharged at room temperature at a constant current
described in Table 1 down to an end-of-discharge voltage specified by the cell manufacturer.
Then, the cell shall be charged at room temperature according to the charging method
declared by the cell manufacturer.
7.3 Capacity
The capacity of a cell shall be measured in accordance with the following phases.
Phase 1 – The cell shall be charged in accordance with 7.2.
After recharge, the cell temperature shall be stabilized in accordance with 4.4.
Phase 2 – The cell shall be discharged at specified temperature at a constant current I (A) to
t
the end-of-discharge voltage that is provided by the cell manufacturer. The discharge current
and cell temperatures indicated in Table 1 shall be used.
In addition to Table 1, specific test conditions may be selected based on the agreement
between the cell manufacturer and the customer. Selective test conditions are shown in
Table A.1.
Table 1 – Discharge conditions
Discharge current
Cell temperature
A
°C
BEV application HEV application
25 1/3 I 1 I
t t
Phase 3 – Measure the discharge duration until the specified end-of-discharge voltage is
reached. Calculate the capacity of cell expressed in Ah up to three significant figures, by
multiplying the discharge current (A) with the discharge duration (h).

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IEC 62660-1:2018 © IEC 2018 – 13 –
7.4 SOC adjustment
The test cells shall be charged as specified below, unless otherwise specified. The SOC
adjustment is the procedure to be followed for preparing cells to the various SOCs for the
tests in this document.
Phase 1 – The cell shall be charged in accordance with 7.2.
Phase 2 – The cell shall be left at rest at room temperature in accordance with 4.4.
Phase 3 – The cell shall be discharged at a constant current according to Table 1 for
(100 − n)/100 × 3 h for BEV application and (100 − n)/100 × 1 h for HEV application, where n
is SOC (%) to be adjusted for each test.
7.5 Power
7.5.1 General
This test is intended to determine the power characteristics of a cell under the representative
usage conditions of BEV and HEV applications.
Based on the current-voltage characteristic test in 7.5.2, the power density and regenerative
power density of a cell shall be calculated according to 7.5.3 and 7.5.4, respectively.
The power density and regenerative power density shall be calculated and reported for each
combination of SOC and temperature in 7.5.2.
7.5.2 Test method
The test shall be carried out in accordance with the following procedure.
a) Mass measurement
Mass of the cell shall be measured as specified in Clause 6.
b) Dimension measurement
Dimensions of the cell shall be measured as specified in Clause 5.
c) SOC and temperature adjustment
The test in 7.5.2 d) shall be conducted under each combination of SOC and cell
temperature at the test commencement as specified in Table 2, according to the procedure
specified by the cell manufacturer.
SOC shall be adjusted according to 7.4.
Table 2 – SOC and temperature condition for power test
Cell temperature
SOC
°C
%
20 25
50 −20 0 25 40
80 25
NOTE Selective test conditions are shown in Table A.2.
d) Current-voltage characteristics test
Discharge the cell for 10 s at the maximum current for discharge specified by the cell
manufacturer (I ), and measure the voltage at the end of the 10 s pulse (U ).
dmax d
SIST EN 62660-1:2019
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Charge the cell for 10 s at the maximum current for charge specified by the cell
manufacturer (I ), and measure the voltage at the end of the 10 s pulse (U ).
cmax c
The values of I and I change depending on SOC, test temperature and charge or
dmax cmax
discharge state.
The charge and discharge limits of current and voltage at low temperature specified by the
cell manufacturer should be taken into account.
In case that I and I are not available, the value may be obtained according to the
dmax cmax
test in Annex C.
7.5.3 Calculation of power density
7.5.3.1 Power calculation
The power shall be calculated according to Equation (1) and is rounded to three significant
figures.
PU× I (1)
d d dmax
where
P is the power (W);
d
U is the measured voltage at the end of the 10 s pulse of I discharge (V);

d dmax
I is the maximum discharge current which is specified by the cell manufacturer (A).
dmax
If P is an estimated value, this shall be stated.
d
7.5.3.2 Power density per unit mass
Mass power density shall be calculated from Equation (2), and is rounded to three significant
figures.
P
d
ρ = (2)
pd
m
where
ρ is the power density (W/kg);
pd
P is the power (W);
d
m is the mass of the cell (kg).
7.5.3.3 Power density per unit volume
Volumetric power density shall be calculated from Equation (3), and is rounded to three
significant figures.
P
d
ρ = (3)
pvlm
V
where
ρ is the volumetric power density (W/l);
pvlm
P is the power (W);
d
V is the volume of the cell (l).
=
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IEC 62660-1:2018 © IEC 2018 – 15 –
7.5.4 Calculation of regenerative power density
7.5.4.1 Regenerative power
Regenerative power shall be calculated according to Equation (4) and is rounded to three
significant figures.
PU× I (4)
c c cmax
where
P is the regenerative power (W);
c
U is the measured voltage at the end of the 10 s pulse of I charge (V);
c cmax
I is the maximum charge current specified by the cell manufacturer (A).
cmax
If P is an estimated value, this shall be stated.
c
7.5.4.2 Regenerative power density per unit mass
Regenerative power density per unit mass shall be calculated from Equation (5) and is
rounded to three significant figures.
P
c
ρ = (5)
pc
m
where
ρ is the regenerative power density (W/kg);
pc
P is the regenerative power (W);
c
m is the mass of the cell (kg).
7.5.4.3 Regenerative power density per unit volume
Volumetric regenerative power density shall be calculated from Equation (6) and is rounded to
three significant figures.
P
c
ρ = (6)
pvlmc
V
where
ρ is the volumetric regenerative power density (W/l);
pvlmc
P is the regenerative power (W);
c
V is the volume of the cell (l).
7.6 Energy
7.6.1 General
This test is intended to determine the energy density that can be derived from a cell under the
representative usage conditions of BEV and HEV applications.
Based on the test in 7.6.2, the energy density of a cell shall be calculated according to 7.6.3.
=
SIST EN 62660-1:2019
– 16 – IEC 62660-1:2018 © IEC 2018
7.6.2 Test method
Mass energy density (Wh/kg) and volumetric energy density (Wh/l) of cells in a certain current
discharge of 1/3 I (A) for BEV application and 1 I (A) for HEV application shall be determined
t t
according to the following procedure.
a) Mass measurement
Mass of the cell shall be measured as specified in Clause 6.
b) Dimension measurement
Dimensions of the cell shall be measured as specified in Clause 5.
c) Capacity measurement
Capacity of the cell shall be determined in accordance with 7.3 at room temperature.
d) Average voltage calculation
The value of the average voltage during discharging in the above capacity test shall be
obtained by integrating the discharge voltage over time and dividing the result by the
discharge duration. The average voltage is calculated in a simple manner using the
following method: Discharge voltages U , U , …, U are noted every 5 s from the time the
1 2 n
discharging starts and voltages that cut off the end-of-discharge voltage in less than 5 s
are discarded. The average voltage U is then calculated in a simplified manner using
avr
Equation (7) up to three significant figures by rounding off the result.
UU+ ++ U
12 n
U = (7)
avr
n
7.6.3 Calculation of energy density
7.6.3.1 Energy density per unit mass
The mass energy density shall be calculated using Equation (8) and Equation (9) up to three
significant figures by rounding off the result.
W = CU (8)
ed d avr
where
W is the electric energy of the cell at room temperature (Wh) when discharged under
ed
specified conditions;
C is the discharge capacity (Ah) at 1/3 I (A) for BEV or 1 I (A) for HEV;
d t t
U is the average voltage during discharging (V).
avr
W
ed
(9)
ρ =
ed
m
where
ρ is the mass energy density (Wh/kg);
ed
W is the electric energy of the cell at room temperature (Wh) when discharged under
ed
specified conditions;
m is the mass of the cell (kg).
7.6.3.2 Energy density per unit volume
The volumetric energy density shall be calculated using Equation (10) up to three significant
figures by rounding off the result.

SIST EN 62660-1:2019
IEC 62660-1:2018 © IEC 2018 – 17 –
W
ed
ρ = (10)
evlmd
V
where
ρ is the volumetric energy density (Wh/l);
evlmd
W is the electric energy of the cell at room temperature (Wh) when discharged under
ed
specified conditions;
V is the volume of the cell (l).
7.7 Storage test
7.7.1 General
This test is intended to determine the capacity retaining characteristics of a cell under storage
or non-use, and is composed of the charge retention test in 7.7.2 and the storage life test
in 7.7.3.
7.7.2 Charge retention test
This test is intended to determine the charge retention characteristics of a cell under storage
including transportation.
The charge retention characteristics of the cell at a 50 % SOC shall be determined according
to the following procedure.
Phase 1 – The cell shall be charged in accordance with 7.2.
Phase 2 – The cell shall be discharged to 50 % SOC in accordance with the method specified
in 7.4. Then, the cell shall be stabilized at room temperature for 1 h.
NOTE The SOC value can be changed according to the agreement between the customer and the cell
manufacturer.
Phase 3 – Discharge the cell to the end-of-discharge voltage at a discharge current of 1/3 I (A)
t
for BEV application and 1 I (A) for HEV application and at room temperature. This discharge
t
capacity is C .
b
Phase 4 – Repeat phases 1 and 2 one time.
Phase 5 – The cell shall be stored for 28 days at an ambient temperature of 45 °C.
Phase 6 – After phase 5, the cell shall be stabilized at room temperature according to 4.4.
Then, discharge the cell at a constant current of 1/3 I (A) for BEV application and 1 I (A) for
t t
HEV application until the end-of-discharge voltage, and then measure the capacity of cell.
This discharge capacity is C .
r
Charge retention ratio shall be calculated according to Equation (11).
C
r
R ×100 (11)
C
b
=
SIST EN 62660-1:2019
– 18 – IEC 62660-1:2018 © IEC 2018
where
R is the charge retention ratio (%);
C is the capacity of the cell after storage (Ah);
r
C is the capacity of the cell before storage (Ah).
b
7.7.3 Storage life test
This test is intended to determine the degradation characteristics of a cell under the storage
or non-use of BEV and HEV applications.
The storage life of a cell shall be determined according to the following procedure.
Phase 1 – Determine the capacity, power density and regenerative power density of the cell in
accordance with 7.2, 7.3 and 7.5.
Phase 2 – Adjust the SOC of the cell to 100 % for BEV application, and to 50 % for HEV
application in accordance with 7.4. The cell shall then be stored for 42 days at an ambient
temperature of 45 °C.
Phase 3 – Following the storage of phase 2, the cell shall be stablized at room temperature
according to 4.4 and discharged at a constant current of 1/3 I (A) for BEV application and
t
1 I (A) for HEV application, down to the end-of-discharge voltage specified by the cell
t
manufacturer. Then, measure the capacity of the cell. This discharge capacity is the retained
capacity (Ah). The power density and regenerative power density shall also be measured.
Phase 4 – Repeat phase 2 and phase 3 for three times.
The capacity, power density, regenerative power density and retained capacity measured in
phase 1 and phase 3 shall be reported.
If the cell is stored at room temperature during the test for rest such as for test timing
adjustment, the total time of such rest shall be reported.
7.8 Cycle life test
7.8.1 General
This test is intended to determine the degradation characteristics of the cell by charge and
discharge cycles representing the normal usage conditions of BEV and HEV applications.
The cycle life performance of a cell for BEV application and HEV application shall be
determined according to the tests in 7.8.2 and 7.8.3.
The test sequence is shown in Annex B.
NOTE Selective test conditions are shown in Table A.3.
7.8.2 BEV cycle test
7.8.2.1 Measurement of initial performance
Before the charge and discharge cycle test, measure the capacity, dynamic discharge
capacity, and power as the initial performance of the cell.
• Capacity
The capacity shall be measured as specified in 7.3 at 25 °C.
• Dynamic discharge capacity C
D
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