IEC 60050-631:2024

IEC 60050-631 ®
Edition 1.0 2024-02
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International Electrotechnical Vocabulary (IEV) –
Part 631: Electrical energy storage systems

Vocabulaire Electrotechnique International (IEV) –
Partie 631: Systèmes de stockage de l’énergie électrique
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IEC 60050-631 ®
Edition 1.0 2024-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
International Electrotechnical Vocabulary (IEV) –

Part 631: Electrical energy storage systems

Vocabulaire Electrotechnique International (IEV) –

Partie 631: Systèmes de stockage de l’énergie électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.040.29, 29.240.01 ISBN 978-2-8322-8362-2

– 2 – IEC 60050-631:2024 © IEC 2024
CONTENTS
FOREWORD .4
INTRODUCTION Principles and rules followed .8
1 Scope . 14
2 Normative references . 14
3 Terms and definitions . 14
Section 631-01 – Electrical energy storage systems classification. 16
Section 631-02 – Electrical energy storage systems specification . 22
Section 631-03 – Electrical energy storage systems planning and installation . 44
Section 631-04 – Electrical energy storage systems operation . 51
Section 631-05 – Electrical energy storage systems safety and environmental issues . 53

Figure 1 – Illustrative example of charging/discharging cycle . 23
Figure 2 – EES system architecture with one point of connection type . 26
Figure 3 – EES system architecture with two point of connection types . 26
Figure 4 – Illustrative example of a power capability chart . 32

INDEX . 55

SOMMAIRE
AVANT-PROPOS .6
INTRODUCTION Principes d’établissement et règles suivies . 11
1 Domaine d’application . 15
2 Références normatives . 15
3 Termes et définitions . 15
Section 631-01 – Classification des systèmes de stockage de l’énergie électrique . 16
Section 631-02 – Spécification des systèmes de stockage de l’énergie électrique . 22
Section 631-03 – Planification et installation des systèmes de stockage de l’énergie
électrique . 44
Section 631-04 – Fonctionnement des systèmes de stockage de l’énergie électrique . 51
Section 631-05 – Problèmes de sécurité et d’environnement des systèmes de stockage
de l’énergie électrique . 53

Figure 1 – Exemple illustratif du cycle de charge/décharge . 24
Figure 2 – Architecture de système EES avec un type de point de connexion . 27
Figure 3 – Architecture de système EES avec deux types de points de connexion . 27
Figure 4 – Exemple illustratif d’un diagramme de capacité de puissance . 34

INDEX . 55

– 4 – IEC 60050-631:2024 © IEC 2024
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INTERNATIONAL ELECTROTECHNICAL VOCABULARY (IEV) –

Part 631: Electrical energy storage systems

FOREWORD
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International Standard IEC 60050-631 has been prepared by IEC technical committee 120:
Electrical Energy Storage (EES) Systems, under the responsibility of IEC technical
committee 1: Terminology.
This first edition comprises terminology derived from IEC 62933 series. It has the status of a
horizontal standard in accordance with IEC Guide 108.
The text of this standard is based on the following documents:
Draft Report on voting
1/2477/FDIS 1/2488/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 60050 series, published under the general title International
Electrotechnical Vocabulary, can be found on the IEC website and is available at
www.electropedia.org.
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