IEC 62933-5-3:2023

Electrical energy storage (EES) systems - Part 5-3: Safety requirements for grid-integrated EES systems – Performing unplanned modification of electrochemical based system

IEC 62933-5-3:2023 applies to those instances when a BESS undergoes unplanned modifications. Such modifications can involve one or more of the following:
- changes in energy storage capacity;
- changes of chemistries, design and manufacturer of the accumulation subsystem;
- changes of a subsystem component using non-OEM parts,
- changes to the mode of operation,
- changes of the installation site, or
- changes in an accumulation subsystem due to an installation of reused or repurposed batteries.
Any such modification can impair the original state of safety of the BESS.
This document complements IEC 62933-5-2, which relates to the overall safety aspects of a BESS. The requirements covered by this document are applied in addition to the requirements in IEC 62933-5-2 in accordance with each situation.

Systèmes de stockage de l’énergie électrique (EES) - Partie 5-3: Exigences de sécurité pour les systèmes EES intégrés dans un réseau – Modification non programmée d'un système électrochimique

L’IEC 62933-5-3:2023 s’applique aux situations dans lesquelles un BESS subit des modifications non programmées. Ces modifications peuvent comporter un ou plusieurs des éléments suivants:
- modifications de la capacité de stockage énergétique;
- modifications des compositions chimiques et de la conception, et changement de fabricant du sous-système d’accumulation;
- modifications d’un composant de sous-système qui utilise des pièces non OEM;
- modifications du mode de fonctionnement;
- modifications du site d’installation; ou
- modifications d’un sous-système d’accumulation en raison d’une installation de batteries réutilisées ou réaffectées.
Une telle modification peut compromettre l’état de sécurité initial du BESS.
Le présent document complète l’IEC 62933-5-2 qui concerne les aspects liés à la sécurité globale d’un BESS. Les exigences couvertes par le présent document sont appliquées en plus des exigences de l’IEC 62933-5-2 conformément à chaque situation.

General Information

• Status: Published
• Publication Date: 09-Oct-2023
• ICS: 13.020.30 - Environmental impact assessment
• Technical Committee: TC 120 - Electrical Energy Storage (EES) systems
• Drafting Committee: WG 5 - TC 120/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 10-Nov-2023
• Completion Date: 10-Oct-2023

Standards Content (Sample)

IEC 62933-5-3 ®
Edition 1.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical energy storage (EES) systems –
Part 5-3: Safety requirements for grid-integrated EES systems – Performing
unplanned modification of electrochemical based system

Systèmes de stockage de l’énergie électrique (EES) –
Partie 5-3: Exigences de sécurité pour les systèmes EES intégrés dans un
réseau – Modification non programmée d'un système électrochimique
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IEC 62933-5-3 ®
Edition 1.0 2023-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electrical energy storage (EES) systems –

Part 5-3: Safety requirements for grid-integrated EES systems – Performing

unplanned modification of electrochemical based system

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

Partie 5-3: Exigences de sécurité pour les systèmes EES intégrés dans un

réseau – Modification non programmée d'un système électrochimique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.020.30  ISBN 978-2-8322-7615-0

– 2 – IEC 62933-5-3:2023 © IEC 2023
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General requirements on performing unplanned modifications . 9
5 Changes to an accumulation subsystem . 10
5.1 General . 10
5.2 Changes in energy storage capacity . 11
5.2.1 General . 11
5.2.2 Safety requirements in the redesign phase . 12
5.2.3 Safety requirements in the installation and commissioning phase . 12
5.2.4 Safety requirements for the operation and maintenance . 13
5.3 Changes of chemistries, design and manufacturer of an accumulation
subsystem . 14
5.3.1 General . 14
5.3.2 Safety requirements in the redesign phase . 15
5.3.3 Safety requirements in the installation and commissioning phase . 15
5.3.4 Safety requirements for the operation and maintenance . 16
6 Changes of a system component using non-OEM parts . 17
6.1 General . 17
6.2 Safety requirements in the redesign phase . 18
6.3 Safety requirements in the installation and commissioning phase . 18
6.4 Safety requirements for the operation and maintenance . 19
7 Changes to mode of operation . 19
7.1 General . 19
7.2 Safety requirements in the redesign phase . 20
7.3 Safety requirements in the installation and commissioning phase . 20
7.4 Safety requirements for the operation and maintenance . 21
8 Changes of installation site . 22
8.1 General . 22
8.2 Safety requirements in the redesign phase . 22
8.3 Safety requirements in the installation and commissioning phase . 23
8.4 Safety requirements for the operation and maintenance . 24
9 Changes in an accumulation subsystem due to an installation of reused or
repurposed batteries . 24
9.1 General . 24
9.2 Safety requirements in the design phase. 25
9.2.1 General . 25
9.2.2 Validation of history data . 25
9.2.3 Estimation of residual usable period and performance . 26
9.2.4 Safety requirements in the design of safety . 26
9.3 Safety requirements in the installation and commissioning phase . 29
9.3.1 General . 29
9.3.2 Safety requirements for installation and commissioning process . 29
9.4 Safety requirements for the operation and maintenance . 30

9.4.1 General . 30
9.4.2 Safety requirements for monitoring data . 30
9.4.3 Safety requirements for operation and maintenance process . 31
Annex A (informative) Example of a safety validation method when performing
unplanned modifications of a BESS using lithium-ion batteries . 33
A.1 General . 33
A.2 Estimation methods for deterioration of lithium-ion battery . 33
A.3 Safety estimation of BESS by deterioration estimation method . 33
Bibliography . 35

Figure 1 – Major modifications and their classification . 9
Figure 2 – Example of BESS architecture . 11
Figure 3 – Life cycle of reused or repurposed battery . 25
Figure A.1 – Example of BESS with a safety estimation function . 34
Figure A.2 – Example of a safety assessment network using an estimation function . 34

Table 1 – Examples of relevant stakeholders . 10
Table 2 – Examples of different batteries chemistry modifications and their
categorization . 14
Table 3 – Examples of subsystem and safety relevant components . 17

– 4 – IEC 62933-5-3:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL ENERGY STORAGE (EES) SYSTEMS –

Part 5-3: Safety requirements for grid-integrated EES systems –
Performing unplanned modification of electrochemical based system

FOREWORD
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