Flow battery energy systems for stationary applications - Part 2-2: Safety requirements

IEC 62932-2-2:2020 applies to flow battery systems for stationary applications and their installations with a maximum voltage not exceeding 1 500 V DC in compliance with IEC 62932-1. This document defines the requirements and test methods for risk reduction and protection measures against significant hazards relevant to flow battery systems, to persons, property and the environment, or to a combination of them. This document is applicable to stationary flow battery systems intended for indoor and outdoor commercial and industrial use in non-hazardous (unclassified) areas. This document covers significant hazards, hazardous situations and events, with the exception of those associated with natural disaster, relevant to flow battery systems, when they are used as intended and under the conditions foreseen by the manufacturer including reasonably foreseeable misuse thereof. The requirements described in this document are not intended to constrain innovations. When considering fluids, materials, designs or constructions not specifically dealt with in this document, these alternatives are evaluated as to their ability to yield levels of safety equivalent to those specified in this document.

Systèmes de production d'énergie à batteries d'accumulateurs à circulation d'électrolyte pour les applications stationnaires - Partie 2-2: Exigences de sécurité

L’IEC 62932-2-2:2020 s’applique aux systèmes de batteries d’accumulateurs à circulation d’électrolyte pour les applications stationnaires et à leurs installations avec une tension maximale ne dépassant pas 1 500 V en courant continu conformément à l’IEC 62932-1.
Le présent document définit les exigences et les méthodes d’essai pour la réduction du risque, ainsi que les mesures de protection contre les dangers significatifs, concernant les systèmes de batteries d’accumulateurs à circulation d’électrolyte, les personnes, les biens et l’environnement, ou une combinaison de ces facteurs.
Le présent document est applicable aux systèmes de batteries d’accumulateurs à circulation d’électrolyte stationnaires destinés à une utilisation commerciale et industrielle à l’intérieur et à l’extérieur dans des emplacements (non classés) non dangereux.
Le présent document couvre les dangers, ainsi que les situations et événements dangereux significatifs, à l’exception de ceux associés à une catastrophe naturelle, concernant les systèmes de batteries d’accumulateurs à circulation d’électrolyte, lorsqu’ils sont utilisés tel que prévu et dans les conditions prévues par le fabricant, y compris leur mauvaise utilisation raisonnablement prévisible.
Les exigences décrites dans le présent document ne sont pas destinées à limiter les innovations. La prise en compte des fluides, matériaux, conceptions ou constructions dont le présent document ne traite pas particulièrement évalue ces variantes quant à leur capacité à produire des niveaux de sécurité équivalant à ceux spécifiés dans le présent document.

General Information

Status
Published
Publication Date
17-Feb-2020
Current Stage
PPUB - Publication issued
Completion Date
18-Feb-2020
Ref Project

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IEC 62932-2-2
Edition 1.0 2020-02
INTERNATIONAL
STANDARD
Flow battery energy systems for stationary applications –
Part 2-2: Safety requirements
IEC 62932-2-2:2020-02(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

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---------------------- Page: 2 ----------------------
IEC 62932-2-2
Edition 1.0 2020-02
INTERNATIONAL
STANDARD
Flow battery energy systems for stationary applications –
Part 2-2: Safety requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.220.99 ISBN 978-2-8322-7854-3

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62932-2-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms, definitions and abbreviated terms ........................................................................ 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................... 9

4 Procedure of the risk analysis .......................................................................................... 9

5 Safety requirements and protective measures ............................................................... 10

5.1 General ................................................................................................................. 10

5.2 Risk information .................................................................................................... 10

5.3 Electrical hazards ................................................................................................. 10

5.3.1 Electrical shock ............................................................................................. 10

5.3.2 Short-circuits ................................................................................................. 10

5.3.3 Leakage currents ........................................................................................... 11

5.4 Hazards of gaseous emissions .............................................................................. 11

5.4.1 General ......................................................................................................... 11

5.4.2 Harmful gas ................................................................................................... 12

5.4.3 Ventilation ..................................................................................................... 13

5.4.4 Warning sign ................................................................................................. 13

5.4.5 Close vicinity to emissions ............................................................................. 14

5.5 Hazard posed by liquids ........................................................................................ 14

5.5.1 General ......................................................................................................... 14

5.5.2 Detection of electrolyte leakage ..................................................................... 14

5.5.3 Protective measures against leakage ............................................................. 14

5.5.4 Specific information ....................................................................................... 14

5.5.5 Flow path identification .................................................................................. 15

5.6 Hazards of mechanical cause ............................................................................... 15

5.7 Operational hazards and measures ....................................................................... 15

5.7.1 General ......................................................................................................... 15

5.7.2 Start .............................................................................................................. 15

5.7.3 Remote monitoring and control systems ........................................................ 16

5.7.4 Protection ...................................................................................................... 16

5.7.5 Auxiliary power failure ................................................................................... 16

6 Instructions .................................................................................................................... 16

7 Identification labels or marking ...................................................................................... 16

7.1 Name plate information ......................................................................................... 16

7.2 Warning label information and location ................................................................. 17

8 Transport, storage, disposal and environmental aspects ................................................ 17

8.1 Packing and transport ........................................................................................... 17

8.2 Dismantling, disposal, and recycling ..................................................................... 17

9 Inspection ...................................................................................................................... 17

10 Maintenance .................................................................................................................. 18

11 Verification tests for protective measures ...................................................................... 18

---------------------- Page: 4 ----------------------
IEC 62932-2-2:2020 © IEC 2020 – 3 –

11.1 General ................................................................................................................. 18

11.1.1 Tests ............................................................................................................. 18

11.1.2 Test object ..................................................................................................... 19

11.1.3 Test category ................................................................................................. 19

11.2 Dielectric strength of the parts in contact with the fluid .......................................... 19

11.2.1 Requirements ................................................................................................ 19

11.2.2 Category ........................................................................................................ 19

11.2.3 Number of samples ........................................................................................ 19

11.2.4 Test and acceptance criteria .......................................................................... 19

11.3 Operational sequence ........................................................................................... 19

11.3.1 Requirements ................................................................................................ 19

11.3.2 Category ........................................................................................................ 19

11.3.3 Number of samples ........................................................................................ 19

11.3.4 Test ............................................................................................................... 20

11.3.5 Acceptance criteria ........................................................................................ 20

11.4 Emergency stop .................................................................................................... 20

11.4.1 Requirement .................................................................................................. 20

11.4.2 Category ........................................................................................................ 20

11.4.3 Number of samples ........................................................................................ 20

11.4.4 Test ............................................................................................................... 20

11.4.5 Acceptance criteria ........................................................................................ 20

11.5 Protection ............................................................................................................. 20

11.5.1 Requirements ................................................................................................ 20

11.5.2 Category ........................................................................................................ 21

11.5.3 Number of samples ........................................................................................ 21

11.5.4 Test ............................................................................................................... 21

11.5.5 Acceptance criteria ........................................................................................ 21

11.6 Safety requirement for stacks ............................................................................... 21

Annex A (informative) Recommended structure of user manual ........................................... 22

A.1 General ................................................................................................................. 22

A.2 Table of contents .................................................................................................. 22

A.3 Safety warning ...................................................................................................... 22

A.4 Introduction ........................................................................................................... 22

A.5 Product description ............................................................................................... 22

A.5.1 Overview ....................................................................................................... 22

A.5.2 Technical specifications ................................................................................. 23

A.5.3 System structure............................................................................................ 23

A.5.4 Applications ................................................................................................... 23

A.5.5 Operational sequence .................................................................................... 23

A.6 Site requirements .................................................................................................. 23

A.6.1 Location and load .......................................................................................... 23

A.6.2 Access and clearance .................................................................................... 23

A.6.3 Precautionary measures for fluid containment................................................ 23

A.6.4 Ventilation ..................................................................................................... 24

A.6.5 Temperature .................................................................................................. 24

A.7 Operation .............................................................................................................. 24

A.7.1 General ......................................................................................................... 24

A.7.2 Checks before operation ................................................................................ 24

A.7.3 Energizing and de-energizing the system ....................................................... 24

---------------------- Page: 5 ----------------------
– 4 – IEC 62932-2-2:2020 © IEC 2020

A.7.4 Valve status ................................................................................................... 24

A.7.5 Specific operations ........................................................................................ 24

A.7.6 Notices for operation ..................................................................................... 24

A.8 Alarms and fault finding ........................................................................................ 25

A.9 Maintenance ......................................................................................................... 25

A.10 Contact information ............................................................................................... 25

Annex B (normative) Safety requirements for stacks ............................................................ 26

B.1 General ................................................................................................................. 26

B.2 External short-circuit of the stack .......................................................................... 26

B.2.1 Requirements ................................................................................................ 26

B.2.2 Category ........................................................................................................ 26

B.2.3 Number of samples ........................................................................................ 26

B.2.4 Test ............................................................................................................... 26

B.2.5 Acceptance criteria ........................................................................................ 26

B.3 Heat shock strength .............................................................................................. 27

B.3.1 Requirements ................................................................................................ 27

B.3.2 Category ........................................................................................................ 27

B.3.3 Number of samples ........................................................................................ 27

B.3.4 Test ............................................................................................................... 27

B.3.5 Acceptance criteria ........................................................................................ 27

B.4 Leakage of the stack ............................................................................................. 27

B.4.1 Requirements ................................................................................................ 27

B.4.2 Category ........................................................................................................ 28

B.4.3 Number of samples ........................................................................................ 28

B.4.4 Test ............................................................................................................... 28

B.4.5 Acceptance criteria ........................................................................................ 28

Bibliography .......................................................................................................................... 29

Figure 1 – Flow battery energy system .................................................................................... 7

Table 1 – List of verification tests for protective measurements ............................................ 18

Table B.1 – List of verification tests for stacks for protective measurements ......................... 26

---------------------- Page: 6 ----------------------
IEC 62932-2-2:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLOW BATTERY ENERGY SYSTEMS FOR STATIONARY APPLICATIONS –
Part 2-2: Safety requirements
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The objective of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

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the International Organization for Standardization (ISO) in accordance with conditions determined by agreement

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

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 edition.

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 62932-2-2 has been prepared by IEC technical committee 21:

Secondary cells and batteries, in collaboration with IEC technical committee 105: Fuel cell

technologies.
The text of this International Standard is based on the following documents:
FDIS Report on voting
21/1029/FDIS 21/1035/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62932 series, published under the general title Flow battery energy

systems for stationary applications, can be found on the IEC website.
---------------------- Page: 7 ----------------------
– 6 – IEC 62932-2-2:2020 © IEC 2020

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed
• withdrawn
• replaced by a revised edition, or
• amended.
---------------------- Page: 8 ----------------------
IEC 62932-2-2:2020 © IEC 2020 – 7 –
INTRODUCTION

A flow battery system (FBS) can be utilized in a flow battery energy system (FBES). Such an

FBES can consist of:
– a flow battery system,
– a power conversion system,
– other equipment and surroundings.

The FBES is connected to the external power input/output via a point of connection (POC).

This document covers the domain of the FBES, as shown in Figure 1. Energy to the auxiliary

systems such as the battery management system (BMS), the battery support system (BSS),

and the power conversion system (PCS) may be supplied by one of the following:
a) direct connection to the external power source;
b) the internal power source of the FBES or FBS itself.
Figure 1 – Flow battery energy system
---------------------- Page: 9 ----------------------
– 8 – IEC 62932-2-2:2020 © IEC 2020
FLOW BATTERY ENERGY SYSTEMS FOR STATIONARY APPLICATIONS –
Part 2-2: Safety requirements
1 Scope

This part of IEC 62932 applies to flow battery systems for stationary applications and their

installations with a maximum voltage not exceeding 1 500 V DC in compliance with
IEC 62932-1.

This document defines the requirements and test methods for risk reduction and protection

measures against significant hazards relevant to flow battery systems, to persons, property and

the environment, or to a combination of them.

This document is applicable to stationary flow battery systems intended for indoor and outdoor

commercial and industrial use in non-hazardous (unclassified) areas.

This document covers significant hazards, hazardous situations and events, with the exception

of those associated with natural disaster, relevant to flow battery systems, when they are used

as intended and under the conditions foreseen by the manufacturer including reasonably

foreseeable misuse thereof.

The requirements described in this document are not intended to constrain innovations. When

considering fluids, materials, designs or constructions not specifically dealt with in this

document, these alternatives are evaluated as to their ability to yield levels of safety equivalent

to those specified in this document.
2 Normative references

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.

IEC 60079-10-1, Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas

atmospheres

IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –

Protection against electric shock

IEC 60364-4-43, Low-voltage electrical installations – Part 4-43: Protection for safety –

Protection against overcurrent
IEC 60364-6, Low voltage electrical installations – Part 6: Verification
IEC 61936-1, Power installations exceeding 1 kV a.c. – Part 1: Common rules

IEC 62485-2:2010, Safety requirements for secondary batteries and battery installations –

Part 2: Stationary batteries

IEC 62932-1, Flow battery energy systems for stationary applications – Part 1: Terminology and

general aspects

ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs

---------------------- Page: 10 ----------------------
IEC 62932-2-2:2020 © IEC 2020 – 9 –
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62932-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.2 Abbreviated terms
BMS battery management system
BSS battery support system
EES electrical energy storage
FBES flow battery energy system
FBS flow battery system
FMEA failure mode and effects analysis
FTA fault tree analysis
GHS global harmonized system
HAZOP hazard and operability study
MSDS material safety data sheet
PCS power conversion system
POC point of connection
SDS safety data sheet
UPS uninterruptible power system
4 Procedure of the risk analysis
A written risk analysis shall be performed on an FBES to ensure that:
a) all reasonably foreseeable hazards and hazardous events, including reasonably
foreseeable misuse throughout the anticipated lifetime, have been identified;

b) the risk for each of these hazards has been estimated from the combination of its probability

of occurrence and of its foreseeable severity;

c) the two factors which determine each one of the estimated risks (probability and severity)

have been eliminated or reduced to a level not exceeding the acceptable risk level as far

as reasonably possible according to the following principles in the order given:
– eliminate hazards or reduce risks by inherent design measures,

– take necessary protective measures in relation to risks that cannot be reduced by

inherent design measures,

– inform intended users and where appropriate other persons of the residual risks, indicate

whether any particular training is required and specify any need to use personal
protective equipment.

For example, failure mode and effects analysis (FMEA), fault tree analysis (FTA) methods,

hazard and operability study (HAZOP), and/or the following International Standards shall be

used as guidance:
• IEC 60812;
• IEC 61025.
---------------------- Page: 11 ----------------------
– 10 – IEC 62932-2-2:2020 © IEC 2020
5 Safety requirements and protective measures
5.1 General

Each secondary battery has a different structure and therefore only the features critical or

specific to the flow battery shall be taken into consideration. The flow battery energy system as

shown in Figure 1 differs from other secondary batteries, in that a system for circulating the

electrolyte is present. The fluid circulating system consists of tanks, pumps, piping, sensors

and some safety-relevant devices.

From a chemical safety point of view, since fluid is contained in tanks, pipes and stacks, the

sealing is an important factor. There is also the possibility of hazardous gases being present,

requiring that appropriate countermeasures be implemented.

Clause 5 specifies the safety requirements and protective measures in consideration of the

above-mentioned aspects.
5.2 Risk information

The manufacturer shall provide the user with risk information based on the risk analysis to

describe hazards and the appropriate measures taken or to be taken for mitigation purposes.

The information shall include a safety data sheet (SDS).
...

IEC 62932-2-2
Edition 1.0 2020-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Flow battery energy systems for stationary applications –
Part 2-2: Safety requirements
Systèmes de production d’énergie à batteries d’accumulateurs à circulation
d’électrolyte pour les applications stationnaires –
Partie 2-2: Exigences de sécurité
IEC 62932-2-2:2020-02(en-fr)
---------------------- Page: 1 ----------------------
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About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

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committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

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once a month by email. French extracted from the Terms and Definitions clause of

IEC publications issued since 2002. Some entries have been

IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and

If you wish to give us your feedback on this publication or CISPR.
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---------------------- Page: 2 ----------------------
IEC 62932-2-2
Edition 1.0 2020-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Flow battery energy systems for stationary applications –
Part 2-2: Safety requirements
Systèmes de production d’énergie à batteries d’accumulateurs à circulation
d’électrolyte pour les applications stationnaires –
Partie 2-2: Exigences de sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.99 ISBN 978-2-8322-8538-1

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
---------------------- Page: 3 ----------------------
– 2 – IEC 62932-2-2:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms, definitions and abbreviated terms ........................................................................ 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................... 9

4 Procedure of the risk analysis .......................................................................................... 9

5 Safety requirements and protective measures ............................................................... 10

5.1 General ................................................................................................................. 10

5.2 Risk information .................................................................................................... 10

5.3 Electrical hazards ................................................................................................. 10

5.3.1 Electrical shock ............................................................................................. 10

5.3.2 Short-circuits ................................................................................................. 10

5.3.3 Leakage currents ........................................................................................... 11

5.4 Hazards of gaseous emissions .............................................................................. 11

5.4.1 General ......................................................................................................... 11

5.4.2 Harmful gas ................................................................................................... 12

5.4.3 Ventilation ..................................................................................................... 13

5.4.4 Warning sign ................................................................................................. 13

5.4.5 Close vicinity to emissions ............................................................................. 14

5.5 Hazard posed by liquids ........................................................................................ 14

5.5.1 General ......................................................................................................... 14

5.5.2 Detection of electrolyte leakage ..................................................................... 14

5.5.3 Protective measures against leakage ............................................................. 14

5.5.4 Specific information ....................................................................................... 14

5.5.5 Flow path identification .................................................................................. 15

5.6 Hazards of mechanical cause ............................................................................... 15

5.7 Operational hazards and measures ....................................................................... 15

5.7.1 General ......................................................................................................... 15

5.7.2 Start .............................................................................................................. 15

5.7.3 Remote monitoring and control systems ........................................................ 16

5.7.4 Protection ...................................................................................................... 16

5.7.5 Auxiliary power failure ................................................................................... 16

6 Instructions .................................................................................................................... 16

7 Identification labels or marking ...................................................................................... 16

7.1 Name plate information ......................................................................................... 16

7.2 Warning label information and location ................................................................. 17

8 Transport, storage, disposal and environmental aspects ................................................ 17

8.1 Packing and transport ........................................................................................... 17

8.2 Dismantling, disposal, and recycling ..................................................................... 17

9 Inspection ...................................................................................................................... 17

10 Maintenance .................................................................................................................. 18

11 Verification tests for protective measures ...................................................................... 18

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IEC 62932-2-2:2020 © IEC 2020 – 3 –

11.1 General ................................................................................................................. 18

11.1.1 Tests ............................................................................................................. 18

11.1.2 Test object ..................................................................................................... 19

11.1.3 Test category ................................................................................................. 19

11.2 Dielectric strength of the parts in contact with the fluid .......................................... 19

11.2.1 Requirements ................................................................................................ 19

11.2.2 Category ........................................................................................................ 19

11.2.3 Number of samples ........................................................................................ 19

11.2.4 Test and acceptance criteria .......................................................................... 19

11.3 Operational sequence ........................................................................................... 19

11.3.1 Requirements ................................................................................................ 19

11.3.2 Category ........................................................................................................ 19

11.3.3 Number of samples ........................................................................................ 19

11.3.4 Test ............................................................................................................... 20

11.3.5 Acceptance criteria ........................................................................................ 20

11.4 Emergency stop .................................................................................................... 20

11.4.1 Requirement .................................................................................................. 20

11.4.2 Category ........................................................................................................ 20

11.4.3 Number of samples ........................................................................................ 20

11.4.4 Test ............................................................................................................... 20

11.4.5 Acceptance criteria ........................................................................................ 20

11.5 Protection ............................................................................................................. 20

11.5.1 Requirements ................................................................................................ 20

11.5.2 Category ........................................................................................................ 21

11.5.3 Number of samples ........................................................................................ 21

11.5.4 Test ............................................................................................................... 21

11.5.5 Acceptance criteria ........................................................................................ 21

11.6 Safety requirement for stacks ............................................................................... 21

Annex A (informative) Recommended structure of user manual ........................................... 22

A.1 General ................................................................................................................. 22

A.2 Table of contents .................................................................................................. 22

A.3 Safety warning ...................................................................................................... 22

A.4 Introduction ........................................................................................................... 22

A.5 Product description ............................................................................................... 22

A.5.1 Overview ....................................................................................................... 22

A.5.2 Technical specifications ................................................................................. 23

A.5.3 System structure............................................................................................ 23

A.5.4 Applications ................................................................................................... 23

A.5.5 Operational sequence .................................................................................... 23

A.6 Site requirements .................................................................................................. 23

A.6.1 Location and load .......................................................................................... 23

A.6.2 Access and clearance .................................................................................... 23

A.6.3 Precautionary measures for fluid containment................................................ 23

A.6.4 Ventilation ..................................................................................................... 24

A.6.5 Temperature .................................................................................................. 24

A.7 Operation .............................................................................................................. 24

A.7.1 General ......................................................................................................... 24

A.7.2 Checks before operation ................................................................................ 24

A.7.3 Energizing and de-energizing the system ....................................................... 24

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– 4 – IEC 62932-2-2:2020 © IEC 2020

A.7.4 Valve status ................................................................................................... 24

A.7.5 Specific operations ........................................................................................ 24

A.7.6 Notices for operation ..................................................................................... 24

A.8 Alarms and fault finding ........................................................................................ 25

A.9 Maintenance ......................................................................................................... 25

A.10 Contact information ............................................................................................... 25

Annex B (normative) Safety requirements for stacks ............................................................ 26

B.1 General ................................................................................................................. 26

B.2 External short-circuit of the stack .......................................................................... 26

B.2.1 Requirements ................................................................................................ 26

B.2.2 Category ........................................................................................................ 26

B.2.3 Number of samples ........................................................................................ 26

B.2.4 Test ............................................................................................................... 26

B.2.5 Acceptance criteria ........................................................................................ 26

B.3 Heat shock strength .............................................................................................. 27

B.3.1 Requirements ................................................................................................ 27

B.3.2 Category ........................................................................................................ 27

B.3.3 Number of samples ........................................................................................ 27

B.3.4 Test ............................................................................................................... 27

B.3.5 Acceptance criteria ........................................................................................ 27

B.4 Leakage of the stack ............................................................................................. 27

B.4.1 Requirements ................................................................................................ 27

B.4.2 Category ........................................................................................................ 28

B.4.3 Number of samples ........................................................................................ 28

B.4.4 Test ............................................................................................................... 28

B.4.5 Acceptance criteria ........................................................................................ 28

Bibliography .......................................................................................................................... 29

Figure 1 – Flow battery energy system .................................................................................... 7

Table 1 – List of verification tests for protective measurements ............................................ 18

Table B.1 – List of verification tests for stacks for protective measurements ......................... 26

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IEC 62932-2-2:2020 © IEC 2020 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FLOW BATTERY ENERGY SYSTEMS FOR STATIONARY APPLICATIONS –
Part 2-2: Safety requirements
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The objective of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC

Publication(s)"). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with

the International Organization for Standardization (ISO) in accordance with conditions determined by agreement

between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees. While all reasonable efforts are made to ensure that the technical content of IEC Publications is

accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any

end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

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 edition.

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 62932-2-2 has been prepared by IEC technical committee 21:

Secondary cells and batteries, in collaboration with IEC technical committee 105: Fuel cell

technologies.
The text of this International Standard is based on the following documents:
FDIS Report on voting
21/1029/FDIS 21/1035/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62932 series, published under the general title Flow battery energy

systems for stationary applications, can be found on the IEC website.
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– 6 – IEC 62932-2-2:2020 © IEC 2020

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed
• withdrawn
• replaced by a revised edition, or
• amended.
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IEC 62932-2-2:2020 © IEC 2020 – 7 –
INTRODUCTION

A flow battery system (FBS) can be utilized in a flow battery energy system (FBES). Such an

FBES can consist of:
– a flow battery system,
– a power conversion system,
– other equipment and surroundings.

The FBES is connected to the external power input/output via a point of connection (POC).

This document covers the domain of the FBES, as shown in Figure 1. Energy to the auxiliary

systems such as the battery management system (BMS), the battery support system (BSS),

and the power conversion system (PCS) may be supplied by one of the following:
a) direct connection to the external power source;
b) the internal power source of the FBES or FBS itself.
Figure 1 – Flow battery energy system
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– 8 – IEC 62932-2-2:2020 © IEC 2020
FLOW BATTERY ENERGY SYSTEMS FOR STATIONARY APPLICATIONS –
Part 2-2: Safety requirements
1 Scope

This part of IEC 62932 applies to flow battery systems for stationary applications and their

installations with a maximum voltage not exceeding 1 500 V DC in compliance with
IEC 62932-1.

This document defines the requirements and test methods for risk reduction and protection

measures against significant hazards relevant to flow battery systems, to persons, property and

the environment, or to a combination of them.

This document is applicable to stationary flow battery systems intended for indoor and outdoor

commercial and industrial use in non-hazardous (unclassified) areas.

This document covers significant hazards, hazardous situations and events, with the exception

of those associated with natural disaster, relevant to flow battery systems, when they are used

as intended and under the conditions foreseen by the manufacturer including reasonably

foreseeable misuse thereof.

The requirements described in this document are not intended to constrain innovations. When

considering fluids, materials, designs or constructions not specifically dealt with in this

document, these alternatives are evaluated as to their ability to yield levels of safety equivalent

to those specified in this document.
2 Normative references

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.

IEC 60079-10-1, Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas

atmospheres

IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –

Protection against electric shock

IEC 60364-4-43, Low-voltage electrical installations – Part 4-43: Protection for safety –

Protection against overcurrent
IEC 60364-6, Low voltage electrical installations – Part 6: Verification
IEC 61936-1, Power installations exceeding 1 kV a.c. – Part 1: Common rules

IEC 62485-2:2010, Safety requirements for secondary batteries and battery installations –

Part 2: Stationary batteries

IEC 62932-1, Flow battery energy systems for stationary applications – Part 1: Terminology and

general aspects

ISO 7010, Graphical symbols – Safety colours and safety signs – Registered safety signs

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IEC 62932-2-2:2020 © IEC 2020 – 9 –
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62932-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.2 Ab
...

Questions, Comments and Discussion

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