International Collaboration to Advance Solid-State Batteries with Immersion Cooling

19 Feb, 2026

Pursuing battery safety with no limits: International cooperation to combine solid state cell technology with advanced immersion cooling – exchange with Hytzer Energy Co. Ltd

During his trip to China, our CEO Dr. Stefan Andreas Meyer personally visited Hytzer Energy Co., Ltd. and held intensive discussions with its founders, CEO Dr.rer.nat. Xi Dou, Chairman and CTO Prof.Dr. Guanglei Cui. The visit marks an important milestone in the establishment of a strategic partnership with a clear focus on the next generation of solid-state batteries (SSBs) and Whitemark´s immersed cooling solutions. With Hytzer's unique SSB technologies, its SSB product is the only pouch-format cell carrying high energy and power densities,  passing thermal propogation test without complex modular design according to EASA/FAA thermal propogation test requirement for aviation propulsion batteries. Beyond its intrinsic safety nature, Whitemark's unique immersion cooling technology is to push battery safety boundary further to an ever higher level.

Hytzer Energy was named one of the 12 winners of the 2025 Pioneers Award by BloombergNEF. The award recognizes its development of high safe solid-state batteries for high-performance electric vehicles and aviation applications. The technological approach combines rigid skeleton and soft polymeric electrolytes to significantly advance both electric performance and safety.

For Whitemark, the focus is not only on the cell technology itself, but also on the systemic integration of future solid-state solutions with an immersion cooling. Even in the early stages of innovation, we pursue the goal of jointly developing solutions in which solid-state cells and advanced thermal concepts—especially immersion cooling—are considered holistically.

Especially in high-performance applications, the combination of solid-state technology and direct, immersion cooling opens up new degrees of performance level in battery design: in terms of safety, temperature homogeneity, power density, service lifetime and system efficiency. Addressing this perspective together at an early stage forms the basis of our strategic cooperation.

Personal exchanges on site have created the basis for close co-creation – from cell innovation to system architecture. We would like to thank Hytzer Energy and Dr.rer.nat. Xi Dou and Prof.Dr. Gunaglei CUI for the open, technologically in-depth dialogue and look forward to jointly shaping the next steps toward an integrated solid-state system solution.