#Japan #Tokyo #BESS #NITE #JIS C 4442

Promoting Safe Reuse of Used Storage Batteries

In a significant move towards enhancing the safety standards of Battery Energy Storage Systems (BESS), the National Institute of Technology and Evaluation (NITE) has participated in the development of a new Japanese Industrial Standard (JIS), titled "JIS C 4442: Safety Requirements for Electric Energy Storage Systems Connected to Power Systems – Implementation of Unexpected Changes in Electrochemical Systems." This standard is set to be issued on October 20, 2025, and focuses on the safe, long-term management of large stationary storage battery systems.

Key Aspects of JIS C 4442

The newly established standard outlines safety requirements for BESS during periods of unanticipated modifications. Such changes could include relocating battery installations or repurposing used batteries from electric vehicles for BESS applications. It highlights essential requirements for design, installation, testing, and maintenance at various stages of operation, ensuring that BESS can be utilized safely and effectively. This regulatory framework will play a crucial role in preventing accidents related to BESS, thereby fostering a safer environment for energy storage and usage across Japan.

The Importance of BESS

With the growing integration of renewable energy sources like solar and wind, BESS is becoming increasingly vital for managing fluctuations in energy supply and ensuring stability in power grids. However, as BESS technology proliferates globally, there have been incidents of fires and other safety concerns, emphasizing the urgent need for comprehensive safety evaluations and robust regulatory frameworks.

NITE has significantly contributed to this field since the establishment of its large-scale battery testing facility (NLAB) in 2016, where it has been evaluating the safety of BESS technologies. NITE’s expertise has also been crucial in developing international standards under the International Electrotechnical Commission (IEC) Committee TC120, which focuses on electric energy storage systems.

Recent Developments and Contributions

Previously, in 2020, NITE introduced the international standard IEC 62933-5-2, which addressed safety requirements for BESS systems connected to power networks. Following this, the JIS C 4441 standard was implemented in Japan, ensuring the comprehensive management of BESS throughout its lifecycle. JIS C 4441 takes into account critical safety measures, particularly those designed to mitigate fire, explosion, and toxic gas risks associated with battery units.

A New Era for BESS

Recognizing that BESS may undergo unexpected changes during their lifespan, JIS C 4442 aims to fill existing gaps left by previous standards, which did not adequately address these potential modifications. Following rigorous discussions and evaluations within the Japanese Industrial Standards Committee (JISC), JIS C 4442 is poised to be a cornerstone in ensuring ongoing safety practices as battery systems adapt to evolving usage needs.

The issuance of this standard aligns perfectly with Japan's vision of circular economy practices, promoting the effective reuse of limited resources such as used batteries. By encouraging the safe repurposing of batteries, Japan can contribute meaningfully to sustainability goals while maximizing resource efficiency.

Future Implications

As we look toward the future, the implementation of JIS C 4442 is expected to cultivate a safer BESS environment across Japan, ultimately contributing to the prevention of mishaps related to battery systems. In addition, NITE's ongoing commitment to developing safer battery technologies and fostering growth within the domestic energy storage industry will be essential as we transition into a more sustainable energy landscape.

Conclusion

The launch of JIS C 4442 is a monumental step forward for the safe utilization of battery energy storage systems in Japan. By advocating for the responsible reuse of used batteries, this standard supports both safety and environmental sustainability initiatives, proving that innovation can go hand in hand with safety and respect for our planet's resources.