South Korea’s S-Oil Corp. announced on Tuesday that it has signed a memorandum of understanding (MOU) with BumhanUnisolutions Co. to enhance cooperation in the development of energy storage systems (ESS) and electric vehicle battery packs based on immersion cooling technology.

The agreement follows BumhanUnisolutions’ successful development of an immersion cooling-type ESS system using S-Oil’s immersion coolant, the S-Oil e-Cooling Solution, which adopts a direct cooling method.

The system has obtained KC certification and battery thermal runaway test certification and is now nearing commercialization.

BumhanUnisolutions has also expanded the application of immersion cooling technology by developing Korea’s first recirculating immersion-cooled EV battery pack.

This battery pack is currently undergoing performance testing in Bumhan Motors’ electric buses.

S-Oil and BumhanUnisolutions plan to collaborate on applying immersion cooling technology across a range of fields, including ESS systems, EV battery packs, and electric propulsion ships.

They will also maintain close cooperation for mutual technical support and product commercialization.

Immersion cooling is gaining attention as a next-generation cooling method that ensures both thermal control efficiency and fire safety.

It is considered an optimized solution for high energy-density systems.

“Our collaboration with BumhanUnisolutions demonstrates the scalability of immersion cooling technology,” said an official from S-Oil. “We will continue to enhance our competitiveness by leveraging the technology of the S-Oil e-Cooling Solution in thermal management solutions not only for data centers, but also for ESS and EV batteries.”

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