BMW has announced it has brought large-format, pure all-solid-state battery (ASSB) technology to its test vehicle, an i7, which is being operated in the Munich area. This comes after Mercedes-Benz revealed in February this year that it had begun testing solid-state battery technology on public roads with a prototype EQS.
According to BMW, the ASSB battery integrated in its i7 test vehicle combines proven Gen5 construction principles (prismatic cells in modules) with new, innovative module concepts for integrating ASSB battery cells with sulfide-based electrolytes from Solid Power.
With a higher energy density compared to current battery technologies, ASSB batteries have the potential to achieve longer ranges in vehicles without the disadvantages with regard to the weight of the overall storage system.
BMW and Solid Power have been in cooperation since 2016, with the former investing in the latter in May 2021 as part of a financing round. Both parties agreed to deepen their partnership at the end of 2022, which will see BMW operate a solid cell prototype line at the CMCC (Cell Manufacturing Competence Centre) in Parsdorf.

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