S-Oil Showcases Immersion Cooling Oil at InterBattery, Targets Thermal Management Market

Unveiling the 'e-Cooling Solution'
Accelerating Entry into the Thermal Management Market

S-Oil has unveiled its immersion cooling-based thermal management solution as it targets the data center and battery markets.

S-Oil announced on the 12th that it showcased its immersion cooling oil, 'S-Oil e-Cooling Solution,' at InterBattery 2026 held at COEX in Gangnam-gu, Seoul.

S-Oil showcased its immersion coolant oil, "S-Oil e-Cooling Solution," at InterBattery 2026 held at COEX in Gangnam-gu, Seoul. S-Oil

'S-Oil e-Cooling Solution' is a product developed in 2024 and is divided into versions for data centers and for batteries (ESS and EV) depending on the application. Among these, the battery version began sales in August 2025. This product serves as a thermal management solution that can be applied in high-heat environments such as ESS, data centers, and electric vehicle (EV) batteries, and can be expanded to various industrial sectors.

The immersion-cooled ESS battery system, which uses S-Oil’s immersion cooling oil for ESS, is currently being supplied mainly to public institutions through Bumhan Unisolution.

The immersion cooling method involves submerging the entire battery cell in a highly insulating dielectric coolant, which effectively blocks fire propagation in the event of thermal runaway. The coolant directly contacts the surface of the cell, quickly absorbing and dissipating heat, while blocking air inflow to fundamentally prevent the spread of fire. In addition to its safety advantages, it also demonstrates superior cooling efficiency compared to conventional air-cooling systems, resulting in extended battery life and reduced operating energy consumption.

S-Oil has verified the performance and safety of its solution through tests such as material compatibility, metal corrosion assessment, and long-term operation. It has also completed application tests for EV batteries.

Furthermore, S-Oil has been continuously collaborating with Bumhan Unisolution, which co-hosted this InterBattery exhibition. The two companies signed an MOU in June 2025 to jointly develop immersion-cooled ESS and EV battery pack systems, and have passed thermal runaway propagation tests. Bumhan Unisolution is a specialized battery pack manufacturer that supplies a variety of battery solutions, including ESS and EV, based on battery modules, packs, and power conversion devices.

S-Oil plans to expand the application of its immersion cooling oil for ESS to additional fields, including data centers, electric vehicles, and other diverse areas.

A representative from S-Oil stated, "We are strengthening our thermal management solution business, which secures both safety and efficiency, based on immersion cooling oil that is already being sold in the ESS market," and added, "We will continue to expand into the next-generation thermal management market through cooperation with various partners going forward."

This content was produced with the assistance of AI translation services.