International Electrotechnical Vocabulary (IEV) – Part 631: Electrical energy storage systems
IEC 60050-631:2024 gives the general terminology applicable to electrical energy storage systems, as well as general terms pertaining to specific applications and associated technologies. It has the status of a horizontal publication in accordance with IEC Guide 108.
This can be purchased: IEC 60050-631:2024 from the IEC store, but it is actually easier to use and free to access on Electropedia: 631: Electrical energy storage systems
See also
International Electrotechnical Commission (IEC), IEC 62933-1