Researchers developing energy storage system that uses retired EV batteries

retired EV batteries Utah Power Electronics Lab

Researchers from the Utah Power Electronics Lab at Utah State partnered with Dream Team, a Maryland-based security research firm, to develop solar energy storage systems using “retired” batteries from electric vehicles. The technology could dramatically reduce the cost of solar energy storage, making the adoption of solar energy more accessible and economically viable for widespread use.

“The target here is to reduce the cost of solar energy storage systems by 50 percent,” said Hongjie Wang, assistant professor of electrical and computer engineering. “The cost of electrical vehicle retired batteries is much lower, and we can use them to directly fuel energy storage systems with the active life-balancing technologies that we developed.”

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Supported by the U.S. Department of Energy and the National Renewable Energy Laboratory, the American-Made Solar Prize is a $3 million prize competition designed to transform the best ideas around solar into technology solutions that are ready for market. This year, 121 teams and more than 600 people participated in the three-stage competition, and ten finalists will compete in the final stage September 2021.

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Affordable energy storage isn’t the only benefit of this technology; it can also extend the life of EV batteries and keep them out of landfills. As EV batteries age, their mileage capacity decreases, and people opt to replace them after a few years. These batteries may no longer be best for fueling a car, but they still hold up to 85 percent of their original storage capacity.

“There’s still a lot of capacity there, but it’s not preferred for the EV application,” said Wang. “We can use that remaining capacity for other applications. With solar energy, you don’t have a mileage problem – you just need to provide enough energy storage.”

This technology is the result of work by multiple USU researchers in addition to Wang: Regan Zane, professor of electrical and computer engineering, and electrical engineering doctoral students Marium Rasheed and Mohamed Kamel. It is also one of many recent technological developments to come out of labs within the ASPIRE, the NSF-funded engineering research center aiming to eliminate charging and infrastructure barriers to widespread transportation electrification.

So far, the USU team has won $225,000 in cash and voucher funding and stands to win an additional $575,000 in the final stage, most of which would come to USU for the key technology development.

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