oSIST prEN IEC 63115-2:2026

SLOVENSKI STANDARD
01-marec-2026
Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti -
Zatesnjeni nikelj-kovinski hidridni ponovno polnljivi členi in moduli za industrijsko
uporabo - 2. del: Varnost
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Sealed
nickel-metal hydride cells and batteries for use in industrial applications - Part 2: Safety
Sekundärzellen und -batterien mit alkalischen oder anderen nicht-säurehaltigen
Elektrolyten – Gasdichte Nickel-Metallhydrid-Zellen und -Batterien für den Gebrauch in
industriellen Anwendungen – Teil 2: Sicherheit
Accumulateurs alcalins ou autres accumulateurs à électrolyte non acide - Accumulateurs
étanches au nickel-métal hydrure destinés à l’utilisation dans les applications
industrielles - Partie 2: Sécurité
Ta slovenski standard je istoveten z: prEN IEC 63115-2:2026
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/963/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63115-2 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-30 2026-04-24
SUPERSEDES DOCUMENTS:
21A/924/CD, 21A/953A/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 9,TC 21,TC 120
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
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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 - Sealed
nickel-metal hydride cells and batteries for use in industrial applications - Part 2: Safety

PROPOSED STABILITY DATE: 2027
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IEC CDV 63115-2 © IEC 2026
CONTENTS
Contact . 3
CONTENTS . 4
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 Parameter measurement tolerances . 12
5 General safety considerations . 12
5.1 General . 12
5.2 Insulation and wiring . 13
5.3 Venting . 13
5.4 Temperature, voltage and current management . 13
5.5 Terminal connectors . 14
5.6 Assembly of cells into batteries . 14
5.7 Quality plan . 14
5.8 Type test conditions . 14
5.9 Test items . 14
6 Specific requirements and tests . 15
6.1 General . 15
6.2 Preliminary preparation for test purposes . 15
6.3 Insulation . 16
6.4 Intended use . 16
6.4.1 Vibration . 16
6.4.2 Enclosure stress at high ambient temperature . 16
6.4.3 Temperature cycling . 17
6.5 Reasonably foreseeable misuse. 18
6.5.1 External short-circuit test . 18
6.5.2 Drop test . 18
6.5.3 Mechanical shock (crash hazard) . 18
6.5.4 Thermal abuse test . 19
6.5.5 Crush . 19
6.5.6 Low pressure . 19
6.5.7 Overcharge test . 20
6.5.8 Reverse charge test . 20
7 Battery system safety (considering functional safety) . 21
7.1 Battery management system (BMS) (or battery management unit) -
Requirements for the BMS . 21
7.2 Overheating control (battery system) . 22
8 EMC . 23
9 Information for safety . 23
10 Marking and designation . 23
10.1 Marking . 23
10.2 Designations . 23
10.3 Optional Designations (Recommendation for cells or battery systems which
are used outside equipment) . 23
IEC CDV 63115-2 © IEC 2026
Annex A (informative) Battery system safety (considering functional safety) - General
requirements . 25
Bibliography . 26

Figure 1 – Temperature profile for 6.4.3 - Temperature cycling test . 17
Figure 2 – Examples of BMS locations and battery system configurations . 22

Table 1 – Sample size for type tests . 14
Table 2 – Level of accessibility test. 16
Table 3 – Drop test conditions . 18

IEC CDV 63115-2 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Sealed nickel-metal hydride cells and batteries for use in
industrial applications -
Part 2: Safety
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 corres ponding 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
IEC CDV 63115-2 © IEC 2026
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
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 63115-2 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 2021. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of optional designations (recommendation for cells or battery systems which are
used outside equipment) in 10.3.
The text of this International Standard is based on the following documents:
Draft Report on voting
21A/XX/FDIS 21A/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.
A list of all parts in the IEC 63115 series, published under the general title Secondary cells and
batteries containing alkaline or other non-acid electrolytes - Sealed nickel-metal hydride cells
and batteries for use in industrial applications, 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC CDV 63115-2 © IEC 2026
INTRODUCTION
Note from IEC: 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 61511-1, Functional safety - Safety instrumented systems for the process industry sector -
Part 1: Framework, definitions, system, hardware and application programming
requirementsIEC 61511-1 [1]
IEC 61513, Nuclear power plants - Instrumentation and control important to safety - General
requirements for systemsIEC 61513 [2]
IEC 61951-2:2017, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Secondary sealed cells and batteries for portable applications - Part 2: Nickel-
metal hydrideIEC 61951-2:2017 [3]
IEC 62061, Safety of machinery - Functional safety of safety-related electrical, electronic and
programmable electronic control systemsIEC 62061 [4]
IEC 62933-2-1:2017, Electrical energy storage (EES) systems - Part 2-1: Unit parameters and
testing methods - General specificationIEC 62933-2-1:2017 [5]
IEC TS 62933-5-1:2017, Electrical energy storage (EES) systems - Part 5-1: Safety
considerations for grid-integrated EES systems - General specificationIEC TS 62933-5-1:2017
[6]
IEC 62485-2:2010, Safety requirements for secondary batteries and battery installations - Part
2: Stationary batteriesIEC 62485-2:2010 [7]
ISO 9001:2015, Quality management systems - RequirementsISO 9001:2015 [8]
IEC CDV 63115-2 © IEC 2026
1 Scope
This document specifies designations, tests and requirements for the safe operation of sealed
nickel-metal hydride cells and batteries used in industrial applications excluding road vehicles.
When an IEC International Standard specifying test conditions and requirements for cells used
in special applications is in conflict with this document, the former takes precedence (e.g. IEC
62675 [9]).
Since this document covers batteries for various industrial applications, it includes those
requirements which are common and minimum to the various applications.
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 63115-1:2020, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Sealed nickel-metal hydride cells and batteries for use in industrial applications -
Part 1: Performance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 [10], IEC
63115-1:2020, ISO/IEC Guide 51 [11] and the following apply.
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
safety
freedom from unacceptable risk
[SOURCE: IEC 60050-903:2013 [12], 903-01-19]
3.2
risk
combination of the probability of occurrence of harm and the severity of that harm
[SOURCE: IEC 60050-903:2013 [12], 903-01-07, modified - Note 1 to entry has been omitted.]
3.3
harm
physical injury or damage to the health of people, or damage to property or the environment
[SOURCE: IEC 60050-351:2013, 351-57-02]
3.4
hazard
potential source of harm
IEC CDV 63115-2 © IEC 2026
[SOURCE: IEC 60050-351:2013, 351-57-01, modified - Note 1 to entry has been omitted.]
3.5
intended use
use of a product, process or service in accordance with the specifications, instructions and
information provided by the supplier
[SOURCE: IEC 60050-903:2013 [12], 903-01-13, modified - The words "specifications" and
"instructions" have been added and "for use" omitted.]
3.6
reasonably foreseeable misuse
use of a product, process or service in a way not intended by the supplier, but which can result
from readily predictable human behaviour
[SOURCE: IEC 60050-903:2013 [12], 903-01-14, modified - "may" has been replaced with
"can".]
3.7
cell
basic functional unit, consisting of an assembly of electrodes, electrolyte, container, terminals
and separators, that is a source of electric energy obtained by direct conversion of chemical
energy
[SOURCE: IEC 60050-482 [10], 482-01-01, modified - In the definition, "usually separators" has
been replaced with "separators".]
3.8
sealed nickel-metal hydride cell
cell containing a nickel hydroxide compound for the positive electrode, a hydrogen absorbing
alloy for the negative electrode, and potassium hydroxide or other alkaline solution as
electrolyte, and not releasing either gas or liquid when operated within the limits specified by
the manufacturer
Note 1 to entry: A sealed cell can be equipped with a safety device to prevent a dangerously high internal pressure
and is designed to operate during its life in its original sealed state. See IEC 60050-482 [10], 482-05-17.
3.9
cell block
group of cells connected together in parallel configuration with or without protective devices
(e.g. fuse or PTC (positive temperature coefficient)) and monitoring circuitry
3.10
monobloc
battery with multiple separate but electrically connected cell compartments each of which is
designed to house an assembly of electrodes, electrolyte, terminals or interconnections and
possible separators
[SOURCE: IEC 60050-482 [10], 482-02-17, modified - "battery" has been omitted from the term
and the note to entry deleted.]
3.11
module,
group of cells connected together either in series and/or parallel configuration with
or without protective devices (e.g. fuse or PTC) and monitoring circuitry
IEC CDV 63115-2 © IEC 2026
3.12
battery pack
energy storage device comprised of one or more cells, monoblocs or modules electrically
connected
Note 1 to entry: A battery pack can have a monitoring circuitry which provides information (e.g. cell voltage) to a
battery system.
3.13
battery system
battery
system which comprises one or more cells, cell blocks, monoblocs, modules or battery packs
Note 1 to entry: The battery system has a battery management system to cut off current in case of overcharge,
overcurrent, overdischarge, or overheating.
Note 2 to entry: Overdischarge cut off is not mandatory if there is an agreement on this between the cell
manufacturer or battery and the customer.
Note 3 to entry: The battery system can have cooling or heating units.
Note 4 to entry: The battery system can be enclosed in a battery box.
3.14
battery enclosure
enclosure
physical construction which separates the battery or battery system from its external
environment
3.15
battery management system
BMS
electronic system associated with a battery which has functions to cut off in case of overcharge,
overcurrent, overdischarge, and overheating
Note 1 to entry: The BMS monitors and/or manages its state, calculates secondary data, reports that data and/or
controls its environment to influence the battery's safety, performance and/or service life.
Note 2 to entry: The function of the BMS can be assigned to the battery pack or to equipment that uses the battery
(see Figure 2).
Note 3 to entry: The BMS can be divided and it can be found partially in the battery pack and partially on the
equipment that uses the battery (see Figure 2).
Note 4 to entry: The BMS is sometimes also referred to as a BMU (battery management unit).
3.16
final voltage
specified voltage of a battery at which the battery discharge is terminated
[SOURCE: IEC 60050-482 [10], 482-03-30, modified - The synonyms "end-of-discharge
voltage", "cut-off voltage" and "end-point voltage" have been omitted.]
3.17
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 in C Ah (ampere-hours) declared by the
manufacturer which a single cell can deliver when discharged at the reference test current of 0,2 I A to a specified
t
final voltage, after charging, storing and discharging under specified conditions.
[SOURCE: IEC 60050-482 [10], 482-03-15, modified - "cell" has been added to the definition,
along with a note to entry.]
IEC CDV 63115-2 © IEC 2026
3.18
reference test current
I
t
charge or discharge current, expressed as a multiple of I A, where 𝐼 A=𝐶 Ah/1 h, as defined
t 5
t
in IEC 61434 [13], and based on the rated capacity (C Ah) of the cell or battery
3.19
explosion
failure that occurs when a cell, module, or monobloc container opens violently as a result of a
sudden increase of pressure and temperature in cell due to exothermic reaction and major
components are forcibly expelled
3.20
rupture
mechanical failure of a cell, monobloc or battery induced by an internal or external cause,
resulting in exposure or spillage but not ejection of materials
3.21
leakage
unplanned, visible escape of liquid electrolyte
[SOURCE: IEC 62133-1:2017 [14], 3.9]
3.22
venting
release of excessive internal pressure from a cell, monobloc or battery in a manner intended
by design to preclude rupture or explosion
4 Parameter measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual values,
shall be within the following tolerances:
a) ± 1 % for voltage;
b) ± 1 % for current;
c) ± 1 % for capacity;
d) ± 2 °C for temperature;
e) ± 0,1 % for time;
f) ± 1 % for dimension.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used and all other sources of error in the test procedure.
The details of the instrumentation used shall be provided in each report of results.
5 General safety considerations
5.1 General
The safety of sealed nickel-metal hydride cells or batteries requires the consideration of two
sets of applied conditions:
a) intended use;
b) reasonably foreseeable misuse.
IEC CDV 63115-2 © IEC 2026
The manufacturer can use "cell block(s) or monobloc(s)" instead of "cell(s)" for any test that
specifies "cell(s)". The manufacturer can use "battery pack" instead of "battery" as the test unit
in this document. When battery pack which does not including battery management system is
used as final product, battery pack can be replaced with battery or battery system in this
document. The manufacturer shall clearly declare the test unit for each test.
Cells or batteries shall be so designed and constructed that they are safe under conditions of
both intended use and reasonably foreseeable misuse. It may also be expected that cells or
batteries subjected to intended use shall not only be safe but shall c ontinue to be functional in
all respects.
It is expected that cells or batteries subjected to misuse may fail to function. However, even if
such a situation occurs, they shall not present any significant hazards.
Potential hazards which are the subject of this document are:
c) fire,
d) explosion,
e) electrical shock hazards,
f) venting (such as H gas),
g) rupture of the casing of a cell or battery with exposure of internal components,
h) leakage.
5.2 Insulation and wiring
The insulation resistance between the positive terminal and externally exposed electrically
active surfaces of the battery shall protect against shock hazard.
Internal wiring and insulation should be sufficient to withstand the maximum anticipated current,
voltage and temperature requirements. The orientation of wiring should be such that adequate
clearances and creepage distances are maintained between conductors as per the intended
application standard (or if unknown, as per IEC 60664-1 [15]). The mechanical integrity of
internal connections should be sufficient to accommodate conditions of reasonably foreseeable
misuse (i.e. solder alone is not considered a reliable means of connection). Adequate
clearances and creepage distances as noted above shall also be maintained on control boards
and other areas within the battery.
5.3 Venting
Battery cases and cells shall incorporate a pressure relief mechanism or shall be so constructed
that they will relieve excessive internal pressure at a value and rate that will preclude rupture,
explosion and self-ignition. If encapsulation is used to support cells within an outer case, the
type of encapsulating and the method of encapsulation shall neither cause the battery to
overheat during normal operation nor inhibit pressure relief.
5.4 Temperature, voltage and current management
The design of batteries shall be such that abnormal temperature-rise conditions are prevented.
Batteries shall be designed to be within temperature, voltage and current limits specified by the
cell or battery manufact
...