SIST EN IEC 62933-5-2:2020

Electrical energy storage (EES) systems - Part 5-2: Safety requirements for grid integrated EES systems - Electrochemical based systems (IEC 62933-5-2:2020)

This part of IEC 62933 primarily describes safety aspects for people and, where appropriate,
safety matters related to the surroundings and living beings for grid-connected energy storage
systems where an electrochemical storage subsystem is used.
This safety standard is applicable to the entire life cycle of BESS (from design to end of service
life management).
This document provides further safety provisions that arise due to the use of an electrochemical
storage subsystem (e.g. battery system) in energy storage systems that are beyond the general
safety considerations described in IEC TS 62933-5-1.
This document specifies the safety requirements of an “electrochemical” energy storage system
as a "system" to reduce the risk of harm or damage caused by the hazards of an electrochemical
energy storage system due to interactions between the subsystems as presently understood.

Elektrische Energiespeichersysteme (EES-Systeme) - Teil 5-2: Sicherheitsanforderungen an netzintegrierte EES-Systeme elektrochemische Systeme (IEC 62933-5-2:2020)

Systèmes de stockage de l'énergie électrique (EES) - Partie 5-2: Exigences de sécurité pour les systèmes EES intégrés dans un réseau - Systèmes électrochimiques (IEC 62933-5-2:2020)

L’IEC 62933-5-2:2020 décrit principalement les aspects liés à la sécurité des personnes et, le cas échéant, les questions de sécurité associées à l’environnement et aux êtres vivants pour les systèmes de stockage de l’énergie raccordés à un réseau qui utilisent un sous-système électrochimique de stockage.

Električne naprave za shranjevanje energije (EES) - 5-2. del: Varnostne zahteve za sisteme EES, integrirane v omrežje - Elektrokemični sistemi (IEC 62933-5-2:2020)

General Information

• Status: Published
• Publication Date: 09-Jun-2020
• ICS: 27.010 - Energy and heat transfer engineering in general
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Jun-2020
• Due Date: 10-Aug-2020
• Completion Date: 10-Jun-2020
• Ref Project: EN IEC 62933-5-2:2020 - Electrical energy storage (EES) systems - Part 5-2: Safety requirements for grid-integrated EES systems - Electrochemical-based systems

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 62933-5-2:2020
01-september-2020
Električne naprave za shranjevanje energije (EES) - 5-2. del: Varnostne zahteve za
sisteme EES, integrirane v omrežje - Elektrokemični sistemi (IEC 62933-5-2:2020)
Electrical energy storage (EES) systems - Part 5-2: Safety requirements for grid
integrated EES systems - Electrochemical based systems (IEC 62933-5-2:2020)
Elektrische Energiespeichersysteme (EES-Systeme) - Teil 5-2:
Sicherheitsanforderungen an netzintegrierte EES-Systeme elektrochemische Systeme
(IEC 62933-5-2:2020)
Systèmes de stockage de l'énergie électrique (EES) - Partie 5-2: Exigences de sécurité
pour les systèmes EES intégrés dans un réseau - Systèmes électrochimiques (IEC
62933-5-2:2020)
Ta slovenski standard je istoveten z: EN IEC 62933-5-2:2020
ICS:
27.010 Prenos energije in toplote na Energy and heat transfer
splošno engineering in general
SIST EN IEC 62933-5-2:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62933-5-2:2020

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SIST EN IEC 62933-5-2:2020


EUROPEAN STANDARD EN IEC 62933-5-2

NORME EUROPÉENNE

EUROPÄISCHE NORM
May 2020
ICS 13.020.30

English Version
Electrical energy storage (EES) systems - Part 5-2: Safety
requirements for grid-integrated EES systems - Electrochemical-
based systems
(IEC 62933-5-2:2020)
Systèmes de stockage de l'énergie électrique (EES) - Partie Elektrische Energiespeichersysteme (EES-Systeme) - Teil
5-2: Exigences de sécurité pour les systèmes EES intégrés 5-2: Sicherheitsanforderungen an netzintegrierte EES-
dans un réseau - Systèmes électrochimiques Systeme elektrochemische Systeme
(IEC 62933-5-2:2020) (IEC 62933-5-2:2020)
This European Standard was approved by CENELEC on 2020-05-21. 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,
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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 62933-5-2:2020 E

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SIST EN IEC 62933-5-2:2020
EN IEC 62933-5-2:2020 (E)
European foreword
The text of document 120/173/FDIS, future edition 1 of IEC 62933-5-2, prepared by IEC/TC 120
"Electrical Energy Storage (EES) Systems" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 62933-5-2:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-02-21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-05-21
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.

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SIST EN IEC 62933-5-2:2020
EN IEC 62933-5-2:2020 (E)
Endorsement notice
The text of the International Standard IEC 62933-5-2:2020 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 60364-4-41 NOTE Harmonized as HD 60364-4-41
IEC 60364-4-42 NOTE Harmonized as HD 60364-4-42
IEC 60364-4-43 NOTE Harmonized as HD 60364-4-43
IEC 60721 (series) NOTE Harmonized as EN 60721 (series)
IEC 60896-21 NOTE Harmonized as EN 60896-21
IEC 60896-22 NOTE Harmonized as EN 60896-22
IEC 61140 NOTE Harmonized as EN 61140
IEC 61427-1 NOTE Harmonized as EN 61427-1
IEC 61427-2 NOTE Harmonized as EN 61427-2
IEC 61508 (series) NOTE Harmonized as EN 61508 (series)
IEC 61511-1:2016 NOTE Harmonized as EN 61511-1:2017 (not modified)
IEC 62040-1 NOTE Harmonized as EN IEC 62040-1
IEC 62040-2 NOTE Harmonized as EN IEC 62040-2
IEC 62116:2014 NOTE Harmonized as EN 62116:2014 (not modified)
IEC 62351 (series) NOTE Harmonized as EN 62351 (series)
IEC 62381:2012 NOTE Harmonized as EN 62381:2012 (not modified)
IEC 62443-2-4 NOTE Harmonized as EN IEC 62443-2-4
IEC 62485-1 NOTE Harmonized as EN IEC 62485-1
IEC 62909-1 NOTE Harmonized as EN IEC 62909-1
IEC 62932-1:2020 NOTE Harmonized as EN IEC 62932-1:2020 (not modified)
ISO 1182 NOTE Harmonized as EN ISO 1182
ISO 9241 (series) NOTE Harmonized as EN ISO 9241 (series)
ISO 13732-1:2006 NOTE Harmonized as EN ISO 13732-1:2008 (not modified)
ISO 13850:2015 NOTE Harmonized as EN ISO 13850:2015 (not modified)


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SIST EN IEC 62933-5-2:2020
EN IEC 62933-5-2:2020 (E)
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
IEC 60068-2-52 - Environmental testing - Part 2-52: Tests - EN IEC 60068-2-52 -
Test Kb: Salt mist, cyclic (sodium chloride
solution)
IEC 60079-7 2015 Explosive atmospheres - Part 7: Equipment EN 60079-7 2015
protection by increased safety "e"
+ A1 2017 + A1 2018
IEC 60079-13 - Explosive atmospheres - Part 13: EN 60079-13 -
Equipment protection by pressurized room
"p" and artificially ventilated room "v"
IEC 60079-29 series Explosive atmospheres - Gas detectors EN 60079-29 series
IEC 60364 series Low-voltage electrical installations - -
IEC 60364-4-44 - Low-voltage electrical installations - Part 4- HD 60364-4-442 -
44: Protection for safety - Protection
against voltage disturbances and
electromagnetic disturbances
IEC 60364-6 2016 Low voltage electrical installations - Part 6: HD 60364-6 2016
Verification
  + A11 2017
  + A12 2017
IEC 60529 - Degrees of protection provided by - -
enclosures (IP Code)
IEC 60664-1 2007 Insulation coordination for equipment within EN 60664-1 2007
low-voltage systems - Part 1: Principles,
requirements and tests
IEC 60812 - Failure modes and effects analysis (FMEA EN IEC 60812 -
and FMECA)
4

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SIST EN IEC 62933-5-2:2020
EN IEC 62933-5-2:2020 (E)
Publication Year Title EN/HD Year
IEC 61000-1-2 - Electromagnetic compatibility (EMC) - Part EN 61000-1-2 -
1-2: General - Methodology for the
achievement of functional safety of
electrical and electronic systems including
equipment with regard to electromagnetic
phenomena
IEC 61000-6-7 - Electromagnetic compatibility (EMC) - Part EN 61000-6-7 -
6-7: Generic standards - Immunity
requirements for equipment intended to
perform functions in a safety-related
system (functional safety) in industrial
locations
IEC 61025 - Fault tree analysis (FTA) - -
IEC 61660-1 - Short-circuit currents in d.c. auxiliary EN 61660-1 -
installations in power plants and
substations - Part 1: Calculation of short-
circuit currents
IEC 61660-2 - Short-circuit currents in d.c. auxiliary EN 61660-2 -
installations in power plants and
substations - Part 2: Calculation of effects
IEC 61882 - Hazard and operability studies (HAZOP EN 61882 -
studies) - Application guide
IEC 61936-1 (mod) 2010 Power installations exceeding 1 kV a.c. - EN 61936-1 2010
Part 1: Common rules
  + AC 2013
+ A1 2014 + A1 2014
IEC 62305-2 - Protection against lightning - Part 2: Risk - -
management
IEC 62368-1 - Audio/video, information and EN IEC 62368-1 -
communication technology equipment -
Part 1: Safety requirements
IEC 62477-1 2012 Safety requirements for power electronic EN 62477-1 2012
converter systems and equipment - Part 1:
General
  + A11 2014
+ A1 2016 + A1 2017
IEC 62485-2 - Safety requirements for secondary EN IEC 62485-2 -
batteries and battery installations - Part 2:
Stationary batteries
IEC 62619 2017 Secondary cells and batteries containing EN 62619 2017
alkaline or other non-acid electrolytes -
Safety requirements for secondary lithium
cells and batteries, for use in industrial
applications
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SIST EN IEC 62933-5-2:2020
EN IEC 62933-5-2:2020 (E)
Publication Year Title EN/HD Year
IEC 62933-1 - Electrical energy storage (EES) systems - EN IEC 62933-1 -
Part 1: Vocabulary
IEC/TS 62933-5-1 2017 Electrical energy storage (EES) systems - - -
Part 5-1: Safety considerations for grid
integrated EES systems - General
specification
ISO/IEC Guide 51 2014 Safety aspects - Guidelines for their - -
inclusion in standards

6

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SIST EN IEC 62933-5-2:2020




IEC 62933-5-2

®


Edition 1.0 2020-04




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Electrical energy storage (EES) systems –

Part 5-2: Safety requirements for grid-integrated EES systems –

Electrochemical-based systems




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

Partie 5-2: Exigences de sécurité pour les systèmes EES intégrés dans un


réseau – Systèmes électrochimiques













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 13.020.30 ISBN 978-2-8322-8146-8




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN IEC 62933-5-2:2020
– 2 – IEC 62933-5-2:2020 © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Basic guidelines for safety of BESS . 11
4.1 General . 11
4.2 Approach to BESS safety . 12
4.3 BESS changes in ownership, control or use . 14
5 Hazard considerations . 14
6 BESS system risk assessment . 15
6.1 BESS structure . 15
6.1.1 General characteristics . 15
6.1.2 Specific characteristics . 16
6.2 Description of BESS conditions . 16
6.3 Risk analysis . 16
6.3.1 General . 16
6.3.2 Hazard identification specific to BESS . 17
6.3.3 Risk consideration . 17
6.3.4 System level risk analysis . 17
6.4 System level risk assessment . 17
7 Requirements necessary to reduce risks . 17
7.1 General measures to reduce risks . 17
7.2 Preventive measures against damage to neighbouring inhabitants . 18
7.3 Preventive measures against physical injury or damage to the health of
workers and residents . 18
7.4 Overcurrent protection design . 18
7.5 BESS disconnection and shutdown . 18
7.6 Operation and maintenance . 18
7.7 Staff training . 18
7.8 Safety design . 19
7.9 General requirements for BESS safety . 19
7.10 Inherently safe design of BESS . 19
7.10.1 Protection from electrical hazards . 19
7.10.2 Protection from mechanical hazards . 20
7.10.3 Protection from explosion . 21
7.10.4 Protection from hazards arising from electric, magnetic, and
electromagnetic fields . 21
7.10.5 Protection from fire hazards . 21
7.10.6 Protection from temperature hazards . 21
7.10.7 Protection from chemical effects . 22
7.10.8 Protection from hazards arising from auxiliary, control and
communication system malfunctions . 22
7.10.9 Protection from hazards arising from environments. 22
7.11 Guards and protective measures. 23
7.11.1 General . 23
7.11.2 BESS disconnection and shutdown . 23

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SIST EN IEC 62933-5-2:2020
IEC 62933-5-2:2020 © IEC 2020 – 3 –
7.11.3 Other guards and protective functions of BESS . 24
7.12 Information for end users . 28
7.13 Life cycle safety management . 28
7.13.1 Operation and maintenance . 28
7.13.2 Partial system change . 31
7.13.3 Design revision . 32
7.13.4 End of service life management . 33
7.13.5 Measures for validating life cycle safety management . 33
8 System validation and testing . 33
8.1 General . 33
8.2 Validation and testing of BESS . 36
8.2.1 Electrical hazards . 36
8.2.2 Mechanical hazards . 38
8.2.3 Explosion . 38
8.2.4 Hazards arising from electric, magnetic, and electromagnetic fields . 39
8.2.5 Fire hazards (propagation) . 39
8.2.6 Temperature hazards. 40
8.2.7 Chemical effects . 41
8.2.8 Hazards arising from auxiliary, control and communication system
malfunctions . 42
8.2.9 Hazards arising from environments . 42
8.2.10 IP rating of BESS enclosure and protective guards . 43
9 Guidelines and manuals . 43
Annex A (informative) Ownership models of BESS . 44
Annex B (informative) BESS hazards and risks . 45
B.1 General introduction . 45
B.2 Hazard concerns . 51
B.2.1 General . 51
B.2.2 Fire hazards . 51
B.2.3 Chemical hazards . 51
B.2.4 Electrical hazards . 51
B.2.5 Energy hazards . 52
B.2.6 Physical hazards . 52
B.2.7 High-pressure hazards . 52
B.3 Hazard considerations under normal operating conditions . 52
B.3.1 Fire and explosive hazards . 52
B.3.2 Chemical hazards . 52
B.3.3 Electrical hazards . 53
B.3.4 Physical hazards . 53
B.4 Hazard considerations under emergency/abnormal conditions . 54
B.4.1 Fire hazards . 54
B.4.2 Chemical hazards . 54
B.4.3 Electrical hazards . 55
B.4.4 Physical hazards . 56
B.5 Commercially available battery technologies . 56
B.5.1 Lithium ion (Li-ion) batteries (C-A) . 56
B.5.2 Lead-acid batteries (C-B) . 57
B.5.3 Nickel batteries (C-B) . 58
B.5.4 High-temperature sodium batteries (C-C). 60

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– 4 – IEC 62933-5-2:2020 © IEC 2020
B.5.5 Flow batteries (C-D) . 61
B.5.6 Lithium metal solid state batteries (C-Z) . 63
B.6 Other technologies . 63
Annex C (informative) Large-scale fire testing on BESS . 64
Annex D (informative) Test methods for protection from hazards arising from
environments . 65
D.1 General . 65
D.2 Outdoor installations subject to moisture exposure . 65
D.3 Outdoor installation near marine environments . 65
Annex E (informative)  Information for validation of BESS life cycle safety
management . 66
E.1 Overview . 66
E.2 General introduction . 66
E.3 Operation and maintenance process . 66
E.4 Preventive maintenance . 66
E.5 Measuring and monitoring of system soundness . 67
E.6 Staff training . 67
E.7 Partial system change . 67
E.8 Design revision . 67
Annex F (informative) BESS safety signage . 68
Annex G (informative) Example of testing for verification of thermal control operation . 69
Bibliography . 70

Figure 1 – General description for risk assessment and reduction of BESS . 11
Figure 2 – An example of BESS architecture. 15
Figure 3 – Example of isolated condition (whole isolation of BESS) . 24
Figure 4 – Incompatibility of capacity and/or usage in a BESS . 32

Table 1 – BESS categories . 13
Table 2 – Examples of BESS use. 14
Table 3 – Examples of components within subsystems of a BESS . 16
Table 4 – Examples of incompatibilities that can arise from system changes . 32
Table 5 – Overview of validation and testing for BESS . 35
Table B.1 – Hazards of BESS in common . 47
Table B.2 – Hazards of BESS using non-aqueous electrolyte battery (category "C-A") . 48
Table B.3 – Hazards of BESS using aqueous electrolyte battery (category "C-B") . 49
Table B.4 – Hazards of BESS using high temperature battery (category "C-C") . 50
Table B.5 – Hazards of BESS using flow battery (category "C-D") . 51

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SIST EN IEC 62933-5-2:2020
IEC 62933-5-2:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICAL ENERGY STORAGE (EES) SYSTEMS –

Part 5-2: Safety requirements for grid-integrated EES systems –
Electrochemical-based systems

FOREWORD
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