SK On, a South Korean battery supplier, is exploring a new cooling method for electric vehicle battery packs.
At the recent InterBattery 2025 trade show in South Korea, SK On showcased their focus on immersion cooling. This innovative approach involves submerging battery cells and modules in a thermal fluid, such as oil, instead of using traditional coolant or air circulation. Working closely with SK Enmove, another subsidiary of the SK Group specializing in lubricants, SK On aims to optimize the flow of thermal fluid for maximum contact with battery cells to effectively manage temperatures.
Immersion cooling also necessitates the use of a wireless battery management system (BMS), as it eliminates the challenges associated with liquid flowing around connected wires. SK On emphasizes the importance of direct contact between the thermal fluid and battery cells to efficiently regulate temperatures.
SK presents immersion cooling with next-gen wireless BMS
SK On has implemented a system where a chip is attached to each battery cell, transmitting information to antennas embedded within each module. This innovative approach not only simplifies the layout but also allows for potential expansion of the battery pack capacity.
Major automakers like General Motors and CATL from China have already adopted wireless BMS technology to enhance pack efficiency and range. The integration of wireless BMS is seen as a crucial element in enabling rapid battery swapping, a trend observed in the industry.
SK presents immersion cooling with next-gen wireless BMS
While immersion cooling has been under experimentation by suppliers and automakers for some time, it has yet to be widely adopted in production vehicles. However, companies like Rimac are already leveraging this technology in high-performance electric supercars. Ford is also considering immersion cooling for a new battery type that could simplify module replacement in future EVs.
In addition to immersion cooling, traditional air cooling methods are still being explored by automakers such as Mercedes and Nissan. Mercedes aims to enhance efficiency with its CLA EV, while Nissan is looking into air cooling solutions for upcoming solid-state battery technologies.