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  5. Japan-led New International Standard for Safety of Large-scale stationary Electrical Energy Storage Systems Issued

Japan-led New International Standard for Safety of Large-scale stationary Electrical Energy Storage Systems Issued

- Issuance of world's first standard for safety of large-scale stationary electrical energy storage systems -

May 1, 2020

On April 16, 2020, based on the proposal from Japan, the International Electrotechnical Commission (IEC) issued new international standard for “safety of storage battery-based large-scale stationary electrical energy storage (EES) systems.”

This issuance of the first international standard for the safety of EES systems is expected to contribute to developing environments for assessing such safety at home and abroad and also to further encourage industries to make use of renewable energy in the future.

1. Purpose of and background to the proposal

As part of the efforts for further encouraging industries to make use of renewable energy, it is considered important to level the fluctuation of electricity generated from photovoltaic or wind power and to appropriately integrate such electricity into power systems. To this end, the dissemination of “large-scale stationary EES systems,” which are systems consisting of a combination of large-scale storage batteries, is expected. Moreover, Japan opened a National Laboratory for Advanced Energy Storage Technologies (NLAB) at the National Institute of Technology and Evaluation (NITE) in order to develop domestic industries related to storage batteries. Since then, it has been developing a base on which industries are able to assess safety and other requirements involving large-scale storage battery products for stationary EES systems.

Meanwhile, global society demands development of environments in which industries are able to assess the safety of large-scale stationary EES systems due to fire accidents and other events caused by such systems. To satisfy such demand, NITE formulated a draft proposal for new standard for the safety of large-scale EES systems from the viewpoints of: taking advantage of its knowhow on assessment and tests accumulated at NLAB; and developing an environment in which such systems are disseminated in a safer manner, and submitted the proposal to the IEC. In response, in May 2016, an IEC technical committee, i.e., TC 120 for EES systems, started a project for developing new standard based on Japan’s proposal, and finally, the IEC issued new international standard: IEC62933-5-2 (Electrical energy storage (EES) systems – Part 5-2: Safety requirements for grid-integrated EES systems - Electrochemical-based systems).

2. Outline of the international standard

The new international standard stipulates provisions of safety requirements that industries should satisfy from the perspective of systems concerning large-scale EES systems, which consist of storage batteries using electrochemical technologies and are connected to electricity systems.

This standard is applicable to the entire lifecycle of such systems ranging from design to

end of service life management.

3. Expected effects

Industries’ utilization of the newly-issued safety standard is expected to further advance the development of an environment in which such systems are disseminated.

Furthermore, this establishment of new international standard is also expected to bring about an effect of encouraging overseas markets to smoothly accept Japanese products domestically manufactured, tested and assessed. Specifically, a certification body in Japan is scheduled to issue world-class grade reports on test results under the standard by taking advantage of NLAB.

4. Link to related information

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