BMW begins real-world testing of solid-state batteries in i7 prototype
The BMW Group has begun on-road testing of a BMW i7 prototype equipped with all-solid-state battery (ASSB) cells developed by Solid Power. The test vehicle is being operated in the Munich and it marks a milestone in the company’s long-term battery development strategy.
ASSB technology is being pursued for its potential to offer higher energy density in a smaller, lighter package compared to conventional lithium-ion batteries. This could enable electric vehicles to achieve longer driving ranges without increasing overall battery weight.
The cells used in the i7 test vehicle are large-format, sulfide-based ASSBs developed by Solid Power in collaboration with BMW engineers. These have been fully integrated into a concept battery pack that combines current Gen5 prismatic cell architecture with new module designs suited for solid-state applications.
Solid Power CEO John Van Scoter described the integration as a major step forward: “This is the first time truly all-solid-state battery cells have been demonstrated in a vehicle. We’re continuing to advance our sulfide electrolyte technology to support future EV adoption.”
BMW has worked with Solid Power since 2016 under a joint development agreement, and deepened the partnership in 2022 with a technology transfer deal. This allows BMW to build and test prototype solid-state cells in-house, using a pilot production line at the Cell Manufacturing Competence Center (CMCC) in Parsdorf.
Martin Schuster, BMW Group Vice President of Battery Cell and Module Development, said: “The i7 ASSB test vehicle demonstrates our open approach to new technologies. Collaborations like this help us evaluate promising innovations quickly and efficiently.”
As part of the testing program, BMW will study how the ASSB cells behave under real-world driving conditions. Key areas of focus include thermal management, internal cell pressure regulation, and mechanical expansion within the battery pack.
The company has steadily increased its expertise in battery cell design since 2008, culminating in the establishment of the Battery Cell Competence Center (BCCC) in Munich in 2019. The BCCC handles everything from early research to prototype production and supports BMW’s broader strategy of developing advanced battery technologies through partnerships with global research institutions and technology firms.
The results of the current test phase will inform the next steps in commercializing ASSB technology for future BMW electric vehicles.
Related Posts
