Haichen Energy Storage's 6.25 MWh system at the kiloamp-hour level passes large-scale fire testing and receives international certification

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On April 1, during the 14th International Energy Storage Summit and Exhibition, Aistone Energy Storage released the complete results of its large-scale full-open burn test of the ∞Power 6.25MWh 4-hour long-duration energy storage system, and received a large-scale full-open burn test certification certificate issued by UL Solutions. This is the first time in the world that a long-duration energy storage system featuring 1,000-ampere-hour class cells has passed an open-door full-burn test.

Previously, with organizations such as UL Solutions and other experts witnessing the process throughout, this 6.25MWh 4h long-duration energy storage system carried out extreme full-burn validation strictly in accordance with the latest standards UL 9540A 2025 and NFPA 855-2026. The test setup used a prefabricated compartment maintained in a fully open state; the compartment structure was arranged “back-to-back, shoulder-to-shoulder” with a double 15cm extreme clearance between the two units; the cells operated at full charge at 100% SOC; and multiple stringent boundary conditions were enforced, such as actively closing the active fire-fighting system.

The test results showed that under continuous burning conditions, the system successfully controlled the fire within a single prefabricated compartment without any inter-compartment thermal runaway; after the combustion ended, the steel-compartment structure remained intact, with no significant collapse or structural deformation.

According to the introduction, UL 9540A, 6th edition (published in March 2026), has upgraded safety validation from cells and modules to real fire scenarios at the full-cabinet and full-site level. It has also been adopted by regulators in the United States, Europe, Australia, the Middle East, and elsewhere as an additional market-access requirement. Passing this test means that its 6.25MWh long-duration energy storage system has met the above stringent market-access conditions. (Liu Lili)

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Editor: Song Yafang