SIST EN IEC 62933-4-2:2025

SLOVENSKI STANDARD
01-junij-2025
Sistemi za shranjevanje električne energije (EES) - 4-2. del: Smernice o okoljskih
vprašanjih - Ocenjevanje učinkov na okolje pri odpovedi baterije v sistemu, ki
temelji na elektrokemičnem hranilniku (IEC 62933-4-2:2025)
Electric energy storage (EES) systems - Part 4-2: Guidance on environmental issues -
Assessment of the environmental impact of battery failure in an electrochemical based
storage system (IEC 62933-4-2:2025)
Elektrische Energiespeichersysteme (EES) - Bewertung der Umweltauswirkungen eines
Batterieausfalls in einem elektrochemischen Speichersystem (IEC 62933-4-2:2025)
Systèmes de stockage de l’énergie électrique (EES) - Partie 4-2: Recommandations
relatives aux problèmes environnementaux - Évaluation de l’impact environnemental
d’une défaillance de batterie dans un système de stockage d’énergie électrochimique
(IEC 62933-4-2:2025)
Ta slovenski standard je istoveten z: EN IEC 62933-4-2:2025
ICS:
13.020.30 Ocenjevanje vpliva na okolje Environmental impact
assessment
27.010 Prenos energije in toplote na Energy and heat transfer
splošno engineering in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62933-4-2

NORME EUROPÉENNE
EUROPÄISCHE NORM April 2025
ICS 13.020.30; 27.010
English Version
Electric energy storage (EES) systems - Part 4-2: Guidance on
environmental issues - Assessment of the environmental impact
of battery failure in an electrochemical based storage system
(IEC 62933-4-2:2025)
Systèmes de stockage de l'énergie électrique (EES) - Partie Elektrische Energiespeichersysteme (EES) - Bewertung der
4-2: Recommandations relatives aux problèmes Umweltauswirkungen eines Batterieausfalls in einem
environnementaux - Évaluation de l'impact environnemental elektrochemischen Speichersystem
d'une défaillance de batterie dans un système de stockage (IEC 62933-4-2:2025)
d'énergie électrochimique
(IEC 62933-4-2:2025)
This European Standard was approved by CENELEC on 2025-04-04. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye 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
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62933-4-2:2025 E

European foreword
The text of document 120/387/FDIS, future edition 1 of IEC 62933-4-2, prepared by TC 120 "Electrical
Energy Storage (EES) systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62933-4-2:2025.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-04-30
document have to be withdrawn
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62933-4-2:2025 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 standard indicated:
IEC 60896-21:2004 NOTE Approved as EN 60896-21:2004 (not modified)
IEC 60896-22:2004 NOTE Approved as EN 60896-22:2004 (not modified)
IEC 61427-1:2013 NOTE Approved as EN 61427-1:2013 (not modified)
IEC 61427-2:2015 NOTE Approved as EN 61427-2:2015 (not modified)
IEC 62485-2:2010 NOTE Approved as EN IEC 62485-2:2018 (not modified)
IEC 62485-3:2014 NOTE Approved as EN 62485-3:2014 (not modified)
IEC 62485-5:2020 NOTE Approved as EN IEC 62485-5:2021 (not modified)
IEC 62619:2022 NOTE Approved as EN IEC 62619:2022 (not modified)
IEC 62620:2014 NOTE Approved as EN 62620:2015 (not modified)
IEC 62675:2014 NOTE Approved as EN 62675:2014 (not modified)
IEC 62932-1:2020 NOTE Approved as EN IEC 62932-1:2020 (not modified)
IEC 62932-2-1:2020 NOTE Approved as EN IEC 62932-2-1:2020 (not modified)
IEC 62933 series NOTE Approved as EN IEC 62933 series
IEC 62933-1:2024 NOTE Approved as EN IEC 62933-1:2024 (not modified)
IEC 62933-5-2:2020 NOTE Approved as EN IEC 62933-5-2:2020 (not modified)
IEC 62984-1:2020 NOTE Approved as EN IEC 62984-1:2020 (not modified)
IEC 62984-2:2020 NOTE Approved as EN IEC 62984-2:2020 (not modified)
IEC 62984-3:2020 NOTE Approved as EN IEC 62984-3:2020 (not modified)
IEC 63056:2020 NOTE Approved as EN IEC 63056:2020 (not modified)
IEC 63115-1:2020 NOTE Approved as EN IEC 63115-1:2020 (not modified)
IEC 63115-2:2021 NOTE Approved as EN IEC 63115-2:2021 (not modified)

IEC 62933-4-2 ®
Edition 1.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric energy storage (EES) systems –

Part 4-2: Guidance on environmental issues – Assessment of the environmental

impact of battery failure in an electrochemical based storage system

Systèmes de stockage de l’énergie électrique (EES) –

Partie 4-2: Recommandations relatives aux problèmes environnementaux –

Évaluation de l’impact environnemental d’une défaillance de batterie dans un

système de stockage d’énergie électrochimique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.020.30, 27.010 ISBN 978-2-8327-0147-8

– 2 – IEC 62933-4-2:2025 © IEC 2025
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms, definitions and abbreviated terms . 6
3.1 Terms and definitions . 6
3.2 Abbreviated terms . 8
4 General . 8
5 Failure of the electrochemical accumulation system in a BESS resulting in
environmental issues . 8
5.1 General . 8
5.2 View of the subsystem structure in a BESS and the battery-related failure
site . 9
5.3 Classification of BESS types . 9
5.4 Failure of batteries in the electrochemical accumulation subsystem of a
BESS . 10
6 Guidelines for assessing the environmental impact of a failure of the battery of the
electrochemical accumulation subsystem of the BESS . 11
6.1 General . 11
6.2 Root causes of battery and flow battery failures resulting in impact on the
environment . 11
6.2.1 General . 11
6.2.2 Root causes resulting in battery and flow battery failures . 12
6.2.3 Environmental impacts upon disassembly and disposal of a failed
battery . 14
6.3 Reporting the assessment . 14
Annex A (informative) Summary of typical properties of commercially available
electrochemical energy storage systems for BESS installations . 16
Annex B (informative) Potential environmental impacts related to the type of battery
in the BESS . 22
B.1 General . 22
B.2 Cells with non-aqueous electrolyte – C-A type . 22
B.3 Cells with aqueous electrolyte – C-B type . 22
B.4 Cells with solid electrolyte and operating at temperatures above 250 °C –C-
C type . 23
B.5 Cells with aqueous but recirculating electrolyte or flow cells – C-D type . 23
B.6 Cells with any other electrochemical couple, electrolyte and energy storage
concept or combinations thereof – C-Z type . 23
B.7 Environmental impacts upon disassembly and disposal of a failed battery . 23
Annex C (informative) Selected BESS application scenarios . 24
Annex D (informative) Description of batteries used in BESS . 25
D.1 General . 25
D.2 Cells with non-aqueous electrolyte – C-A type . 25
D.3 Cells with aqueous electrolyte – C-B type . 26
D.4 Cells with solid electrolyte operating at temperatures above 250 °C –
C-C type . 26
D.5 Cells with aqueous but recirculating electrolyte or flow cells – C-D type . 27
D.6 Cells with any other electrochemical couple, electrolyte and energy storage
concept or combinations thereof – C-Z type . 27

IEC 62933-4-2:2025 © IEC 2025 – 3 –
Bibliography . 28

Figure 1 – Example of a BESS structure . 9
Figure 2 – Failure sites in the electrochemical accumulation subsystem within the
scope of this document (highlighted in grey) . 10
Figure 3 – Proximate root causes leading to a battery or flow battery failure in the
BESS with associated environmental impacts . 12
Figure C.1 – BESS application scenarios. 24

Table 1 – Classification of BESS types . 10
Table 2 – Excerpt of a possible assessment report describing failures of a specific
battery and the resulting environmental impacts . 15
Table A.1 – Summary list of typical properties of commercially available
electrochemical energy storage systems in BESS installations – Part 1 . 17

– 4 – IEC 62933-4-2:2025 © IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL ENERGY STORAGE (EES) SYSTEMS –

Part 4-2: Guidance on environmental issues –
...