Electrical Energy Storage (EES) systems - Part 1: Terminology (IEC 62933-1:2018)

This part of IEC 62933 defines terms applicable to electrical energy storage (EES) systems
including terms necessary for the definition of unit parameters, test methods, planning,
installation, safety and environmental issues.
This terminology document is applicable to grid-connected systems able to extract electrical
energy from an electric power system, store it internally, and inject electrical power to an
electric power system. The step for charging and discharging an EES system may comprise
an energy conversion.

Elektrische Energiespeichersysteme (EES-Systeme) - Teil 1: Terminologie

Systèmes de stockage de l’énergie électrique (EES) - Partie 1: Vocabulaire

L’IEC 62933-1:2018 définit les termes applicables aux systèmes de stockage de l’énergie électrique (EES), y compris les termes nécessaires à la définition des paramètres unitaires, des méthodes d’essai, de la planification, de l’installation, de la sécurité et des questions environnementales.
Ce document de terminologie est applicable aux systèmes connectés au réseau capables d’extraire l’énergie électrique d’un réseau d’alimentation électrique, de la stocker en interne et de l’injecter dans un réseau d’alimentation électrique. La phase de charge et de décharge d’un système EES peut inclure une conversion d’énergie.

Električne naprave za shranjevanje energije (EES) - 1. del: Terminologija (IEC 62933-1:2018)

V tem delu standarda IEC 62933 so opredeljeni izrazi, ki se uporabljajo za sisteme za shranjevanje električne energije (EES), vključno z izrazi, potrebnimi za opredelitev parametrov enote, preskusnih metod, načrtovanja, namestitve, varnosti in okoljskih vprašanj.
Ta terminološki dokument se uporablja za sisteme z omrežnim napajanjem, ki lahko električno energijo pridobivajo iz sistema električnega napajanja, jo shranjujejo v notranjosti in dovajajo sistemu električnega napajanja. Polnjenje in praznjenje sistema EES lahko vključuje tudi pretvorbo energije.

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6060 - National Implementation/Publication (Adopted Project)
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Electrical Energy Storage (EES) systems - Part 1: Terminology (IEC 62933-1:2018)
Ta slovenski standard je istoveten z: EN IEC 62933-1:2018
01.040.27 Prenos energije in toplote Energy and heat transfer
(Slovarji) engineering (Vocabularies)
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.


April 2018
ICS 01.040.17
English Version
Electrical Energy Storage (EES) systems - Part 1: Vocabulary
(IEC 62933-1:2018)
Systèmes de stockage de l'énergie électrique (EES) - Partie Elektrische Energiespeichersysteme (EES-Systeme) - Teil
1: Vocabulaire 1: Terminologie
(IEC 62933-1:2018) (IEC 62933-1:2018)
This European Standard was approved by CENELEC on 2018-04-03. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62933-1:2018 E

European foreword
The text of document 120/116/FDIS, future edition 1 of IEC 62933-1, 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 62933-1:2018.

The following dates are fixed:
(dop) 2019-01-03
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-04-03
standards conflicting with the
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.

Endorsement notice
The text of the International Standard IEC 62933-1:2018 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 60027 (series) NOTE Harmonized as EN 60027 (series).
IEC 60964:2009 NOTE Harmonized as EN 60964:2010 (not modified).
IEC 61165:2006 NOTE Harmonized as EN 61165:2006 (not modified).
IEC 61427-2:2015 NOTE Harmonized as EN 61427-2:2015 (not modified).
IEC 61987-1:2006 NOTE Harmonized as EN 61987-1:2006 (not modified).
IEC 62040-1:2017 NOTE Harmonized as EN IEC 62040-1 .
IEC 62477-1:2012 NOTE Harmonized as EN 62477-1:2012 (not modified).
ISO 19353:2015 NOTE Harmonized as EN ISO 19353:2016 (not modified).

To be published. Stage at the time of publication: FprEN 62040-1:2017.
IEC 62933-1 ®
Edition 1.0 2018-02
Electrical energy storage (EES) systems –

Part 1: Vocabulary
Systèmes de stockage de l’énergie électrique (EES) –

Partie 1: Vocabulaire
ICS 01.040.17 ISBN 978-2-8322-5403-5

– 2 – IEC 62933-1:2018  IEC 2018
1 Scope . 6
2 Normative references . 6
3 Terms and definitions for EES systems classification . 6
4 Terms and definitions for EES systems specification . 9
5 Terms and definitions for EES systems planning and installation . 22
6 Terms and definitions for EES systems operation . 24
7 Terms and definitions for EES systems safety and environmental issues . 27
Annex A (informative) Index . 30
A.1 Terms index . 30
A.2 Abbreviated terms index . 32
Bibliography . 33

Figure 1 – Illustrative example of EES system charging/discharging cycle . 10
Figure 2 – Illustrative example of EES system power capability chart . 12
Figure 3 – Illustrative example of EES system response performances . 20
Figure 4 – EES system architecture with one POC type . 22
Figure 5 – EES system architecture with two POC types . 23

Table 1 – Illustrative example of EES system efficiency chart . 18

IEC 62933-1:2018 © IEC 2018 – 3 –

Part 1: Vocabulary
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62933-1 has been prepared by IEC technical committee 120:
Electrical Energy Storage (EES) Systems.
The text of this standard is based on the following documents:
FDIS Report on voting
120/116/FDIS 120/119/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 in the IEC 62933 series, published under the general title Electrical energy
storage (EES) systems, can be found on the IEC website.

– 4 – IEC 62933-1:2018  IEC 2018
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
IEC 62933-1:2018 © IEC 2018 – 5 –
The purpose of this terminology document is to provide terms and definitions for all the
publications under the responsibility of TC 120, that standardize electrical energy storage
systems (EES systems) including unit parameters, test methods, planning, installation, safety
and environmental issues. An EES system includes any type of grid-connected energy
storage which can both store electrical energy and provide electrical energy (from electricity
to electricity).
All TC 120 normative documents are subject to revision, this part of IEC 62933 will be revised
together with other TC 120 publications in order to avoid mismatches.
From the technical point of view, an EES system can be a complex multi stage system with
several possible energy conversions. Each stage is made by components well standardized
(e.g. transformers, power converter systems) or innovative components (e.g. new types of
batteries). Several IEC product standards give definitions necessary for the understanding of
certain terms used for these components. The International Electrotechnical Vocabulary (IEV,
IEC 60050, http://www.electropedia.org), the IEC Glossary (http://std.iec.ch/glossary) and the
ISO Online Browsing Platform (OBP, http://www.iso.org/obp) allow on-line access to this
information. This terminology document completes the scenario by giving definitions
necessary at the system level.
Without a strong standardization of EES systems terminology, focal terms can have a different
meaning in EES systems related to different storage technologies. This aspect is critical also
from the market point of view, it impacts economics and this can become a barrier for tender
processes. The correct comparison among different options is fundamental, therefore basic
terms and definitions impact economic decisions.
Terms and definitions have been harmonized with the IEV, the OBP, the IEC Glossary and
other IEC documents as far as possible. Definitions not included in this terminology document
may be found elsewhere in other IEC documents.
The use of abbreviated terms has been optimized, on the one hand to avoid tedious repetition
and, on the other hand to avoid confusion. A minimu

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