SK On Passes Large-Scale ESS Fire Test, Meets North American Safety Standards
Met UL 9540A Requirements
No Thermal Runaway in Battery Cells in Adjacent Containers
SK On's energy storage system (ESS) passed a large-scale fire test and met North American safety standards.
A container-type ESS product showcased by SK On at InterBattery 2026, held at COEX in Gangnam-gu, Seoul, last March. SK On
View original imageSK On said on October 28 that its ESS had completed a large-scale fire test and met the requirements of UL 9540A, the North American standard for ESS fire safety testing.
UL 9540A is a leading North American ESS safety testing standard that evaluates how much heat spreads to surrounding areas during battery thermal runaway.
Among its tests, the large-scale fire test (LSFT) recreates an actual ESS fire to verify whether the fire spreads to adjacent containers. In March 2026, detailed requirements were strengthened to ensure that factors such as fire spread are assessed against clearer criteria.
The test results showed no thermal runaway in battery cells inside adjacent containers due to heat from the ESS container where the fire occurred. The temperature inside the containers also met the assessment criteria.
SK On said it designed its ESS to disperse and release heat over an extended period, suppressing sharp increases in the heat release rate and reducing the risk of fire spreading to surrounding containers.
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SK On plans to accelerate its efforts to capture a larger share of the global ESS market following its receipt of the UL test report. "This test confirmed the fire safety of SK On's ESS, demonstrating that it can suppress fire spread and maintain key safety performance even under actual fire conditions," a company official said. "We will continue to strengthen our safety technology and product competitiveness, provide customized ESS solutions, and expand our presence in global markets."
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