BMW Testing EVs Powered By All Solid State Batteries
The first BMW electric vehicle (EV) driven by all-solid-state batteries (ASSB) is on the road for testing.
May 21, 2025. By News Bureau
Often called the 'holy grail' of EV battery technology, ASSBs promise significantly higher energy density than current batteries. Since they can pack higher energy density into a smaller space, all-solid-state batteries have the potential to boost driving range at a lower cost.
The i7 test vehicle is based on BMW’s current Gen 5 architecture, using new prismatic cells in modules. To integrate Solid Power’s ASSB cells, BMW modified the platform using new module concepts. BMW and Solid Power have been working together since 2022 to advance the new EV battery tech.
BMW will continue to test sulfide-based electrolytes in solid-state battery packs over the next few months. BMW follows Mercedes-Benz, which announced in February 'the first car powered by a lithium-metal solid-state battery on the road' through its partnership with US-based Factorial Energy.
Mercedes used a modified EQS, fitted with solid-state batteries. With an expected 40 percent weight savings compared to current Li-Ion batteries, Factorial aims to unlock over 600 miles of driving range.
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