XIAMEN, China, Feb. 8, 2026/ PRNewswire/– Just recently, HiTHIUM finished the world’s very first open-door massive fire test of its ∞ Power 6.25 MWh 4h long-duration energy storage (LDES) system geared up with kiloampere-hour (kAh) battery cells. The test was carried out under the complete guidance of agents from UL Solutions, U.S. Authorities Having Jurisdiction, and Fire Defense Engineers. The test strictly adhered to the most recent requirements of UL 9540A 2025 and NFPA 855-2026.
The test results show that the high-energy-density 6.25 MWh energy storage system, integrating ultra-large-capacity battery cells, showed steady and manageable security efficiency under severe conditions. This marks a crucial advancement in security recognition at greater energy levels for LDES systems, even more enhancing the security structure for massive market release.
Extreme Real-World Circumstances: Challenging Security Limitations at Greater Energy Levels
Structure on its previous open-door fire test of a 5MWh system, HiTHIUM carried out an updated recognition concentrating on the ∞ Power 6.25 MWh LDES system and its core ∞ Cell 1175Ah, confirming system-level security at considerably greater energy levels.
The test was carried out under the most rigid conditions: the container doors stayed completely open throughout the test developing an “open-door combustion” condition to take full advantage of oxygen supply and flame effect; surrounding containers were organized back-to-back and side-by-side with just 15 cm spacing; the system ran at 100% state of charge; and all active fire suppression systems were handicapped, relying entirely on intrinsic security style.
3 Core Security Obstacles: Comprehensive Recognition of a Multi-Layer Defense System
To deal with the compounded dangers presented by ultra-large-capacity cells and high-energy-density systems, HiTHIUM executed a multi-layer security architecture covering the cell, module, and system levels. Directed by the core technical technique of “release, defense, and resistance,” the test confirmed the 3 core security difficulties.
Release Without Surge: Exact Management of Ultra-High Energy Release
To handle the enormous energy release throughout thermal runaway of 1175Ah cells, HiTHIUM created a three-dimensional air flow channel with directional venting, and the module embraced a double pressure relief valve security style. This structure allowed fast and regulated gas release at the cell and module levels, avoiding explosive pressure accumulation. No surges or particles ejection were observed throughout the test.
Combustion Without Proliferation: Double Physical Barriers Versus Thermal Spread
Resistance Without Structural Failure: Structural Stability Under Extreme Thermal Tension
To stand up to extended high-temperature direct exposure, the ∞ Power 6.25 MWh system was structurally enhanced with a high-strength steel frame, supports, and dual-layer partitions. After constant combustion, the impacted container stayed structurally undamaged, without any considerable contortion or collapse observed.
A Turning Point Accomplishment: Redefining Security Standards for LDES
This test methodically validated the total security efficiency of the ∞ Power 6.25 MWh LDES system geared up with kAh battery cells, representing a turning point within the worldwide energy storage security recognition structure.
As system capability continues to increase from 5MWh to 6.25 MWh, HiTHIUM stays dedicated to advancing security and dependability through strenuous style requirements and extreme-condition screening.
SOURCE HiTHIUM