• The International Electrotechnical Commission is the leading global
organization that publishes consensus-based International Standards and
manages conformity assessment systems for electric and electronic products,
systems and services, collectively known as electrotechnology ( www.iec.ch )
• IEC TC21 and its SC21A, is one of the 174 TCs (Technical Committees) and SCs
(Subcommittees), and about 700 Project Teams (PT) / Maintenance Teams
(MT) which carries out the standards work of the IEC. The working groups are
composed of people from all around the world who are experts in
electrotechnology. The great majority of them come from industry, while
others from commerce, government, test laboratories, research laboratories,
academia and consumer groups also contribute to the work
• TC21 and SC21A is supported by 25 National Committees and has the task to
prepare product standards for all secondary cells and batteries, irrespective of
type or application. All electrochemical systems are considered.
IEC TC21 Committee for Secondary cells and batteries
has received, with document IEC 21/767/RVN dated 2011-10-28, the go-ahead to
develop a standard for Electrical Energy Storage in Batteries
• Covering rechargeable batteries of any chemistry
In the energy range of 10KWh to 10MWh
For residential and industrial use
For peak power shaving, demand time shifting, load leveling and similar
Receiving energy directly from renewable energy sources or from AC power grid
Supplying power to the AC grid or DC loads
IEC 61427-2 Ed.1
Secondary cells and batteries for renewable
energy storage
Part 2: On-grid applications
The standard will define methods of test and requirements in a end-user
oriented black box storage battery approach
It will cover safe operation, performance and endurance of commercially
available candidate batteries
System safety issues (building codes etc.) are of national resort and will
NOT be addressed in this international IEC standard
Li Ion
Li Pol
NiMH V3+/V5+
IEC 61427-2 Ed.1
Secondary cells and batteries for renewable
energy storage
Part 2: On-grid applications
The working group intends to complement its group of experts in such a
way that all commercially available secondary battery system
chemistries are represented by at least two technical experts in their
Experts from electrical energy equipment manufacturers, energy
producers and users are also invited so to provide the necessary
You would be asked to provide supporting technical data and comments
in your field of expertise and relating to the definition of the test and
requirement clauses to be formulated and then review critically drafts of
Most of the exchange will occur via collaborative tools but you will be
asked to assist to at least a yearly, two-day working group meeting
during which important technical issues will be reviewed and decided.
IEC 61427-2 Ed.1
Secondary cells and batteries for renewable
energy storage
Part 2: On-grid applications
You want to access global markets and build products that are accepted
worldwide. You want to influence the nature of technology and product
development. You want to make money, reduce cost and save time.
Don’t let others decide to which rules you will need to play, sit at the table
where those global product specifications are written and thus assure that
the electrochemical system your company is promoting, is getting adequate
attention in the test and requirement clauses of the standard.
You may be further interested
- To establish a level playing field for all
- Help set standards that other competitors have to equal
- Facilitate trade and new market development
- Know about and influence product requirements
- Improve productivity and save money
- Get to know what other companies are doing in the field
- Benefit from the technical and professional interaction with others
IEC 61427-2 Ed.1
Secondary cells and batteries for renewable
energy storage
Part 2: On-grid applications
What is the timetable?
The timing for establishing the standard is governed by the industriousness of
the working group and the IEC mandated approval and voting periods
• 1Q and 3Q 2012
• WG meeting
draft for
• 4Q 2012
• WG meeting
Final draft of
• 3Q 2013
• WG meeting
IEC 61427-2
Proposed 61427-2 standard clauses
Secondary Cells and Batteries for Renewable Energy Storage and Smart Grid Structures General
Requirements and Methods of Test
Part 2: On-grid applications
1 Scope
This International Standard gives information relating to secondary batteries used in Electrical
Energy Storage (EES) and the associated methods of test used for the verification of their safe
operation, performance and endurance. This part 2 deals with cells and batteries used in on-grid
applications and is battery chemistry agnostic.
This International Standard is system operator oriented so that suitable battery based residential
and industrial installations of EES systems can be identified, selected, operated and recycled
All EES batteries have to achieve safe operation conditions. The performance and endurance
requirements are application related and tied to the specific EES use and the associated economic
constraints. The requirements for performance and endurance are thus essentially application
case related and to be formulated by the end-user.
2 Normative references
The following referenced documents are indispensable for the application 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.
3 Terms and definitions
For the purpose of this document, the definitions and terms for secondary cells and batteries
given in IEC 60050-482 and associated dictionaries
Proposed 61427-2 standard clauses
4 General test conditions
4.1 Accuracy of measuring instruments
5 Test methods
5.1 Safe operation
5.1.1 Emission of gases, liquids or aerosols during operation or storage
5.1.2 Reaction in an event of a short circuit at the terminals of the battery
5.1.3 Reaction in an event of over-discharge of the battery
5.1.4 Reaction in an event of over-charge of the battery
5.1.5 Reaction in an event of battery management controls failure
5.1.6 Reaction in an event of seismic loading, water flooding or fire involving the battery itself
5.1.7 Spent battery material declaration and recycling issues
5.1.8 Any other safe operation topic
Proposed 61427-2 standard clauses
5.2 Performance
5.2.1 Battery voltage vs. load current correlation over its entire permissible load window
5.2.2 Battery charge efficiency
5.2.3 Battery discharge efficiency
5.2.4 Battery heat emission during charge
5.2.5 Battery heat emission during discharge
5.2.6 Battery capacity loss and maintenance during idle periods or storage
5.2.7 Battery subsystems fluids, power and footprint requirements
5.2.8 Any other battery performance topic
Proposed 61427-2 standard clauses
5.3 Endurance
5.3.1 Battery service life determination under a very high rate, short duration (<15m)
cyclic charge-discharge service to be expected in grid frequency control applications
5.3.2 Battery service life determination under a moderate rate, medium duration (<3h)
charge-discharge service to be expected in load shifting and load levelling applications
5.3.3 Battery service life determination under a low rate, long duration (>8h) cyclic
charge-discharge service to be expected in seasonal energy storage applications
5.3.4 Battery service life determination under a PSOC, cyclic charge- discharge service
to be expected in wind energy storage applications
5.3.5 Any other battery endurance topic
Please give us the following details
Postal address
E-mail address
Your field of experience relating to the proposed standard IEC 61427-2
Send to: h.giess@me.com
Contacts and further information
TC21 WG 3 Convener
Herbert Giess
Swiss NC TK21
TC21 Secretary
Yves Boudou
TC 21 Chairman
Friedrich Kramm