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UL issues world’s first certification for repurposed EV batteries to Nissan/Sumitomo JV

UL announced that 4R Energy Corporation, a joint venture of Nissan Motors and Sumitomo Corporation focusing on the effective reuse of EV batteries for energy storage systems, is the first organization worldwide to be certified to UL 1974, the Standard for Evaluation for Repurposing Batteries.

Outlining how to sort and grade battery packs, modules and cells that were originally made for electric vehicles (EV) and other applications, UL 1974 helps identify a battery’s state-of-health and introduces ratings to determine the viability for their continued use.

Through this process, performance-validated “second-life” batteries can be utilized for energy storage systems to provide a safe, reliable, clean energy source.

Repurposed EV battery safety and reliability have always been top priorities for our company since we were established in 2010. With UL 1974, our production process has now been certified by one of the world’s leading independent, third-party testing and certification organizations. We are very excited about this milestone, as it helps build customer trust concerning the viability of second life batteries, and will contribute to the further growth of energy storage systems.

—Eiji Makino, president of 4R Energy

As the EV market continues to grow, there is an increased emphasis on repurposing batteries used in EVs. Concurrent with this is an escalating demand globally for efficient renewable energy resources. Innovative energy storage solutions are expected to become a key component of the electricity grid, boosting reliability and helping to integrate renewable energy sources, such as wind and solar.

Anticipating the deployment of second life automotive batteries for energy storage systems, UL initiated a standard development process to address the safety and reliability of repurposing batteries. In October 2018, UL 1974 was published as a bi-national Standard of the United States and Canada.



Given the recent fires in utility-scale battery banks, the reliability and safety of these schemes should be questioned.


Et al:
Nissan's lack of interest in developing their traction batteries for the Leaf is disappointing; their approach has been to build EVs to collect Government money then fuhgeddaboudit and leave the Leaf customers with boat anchors.
The chemistry of the first generation Leaf batteries has been very stable and quite safe compared to other chemistries:

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