SHANGHAI, July 3, 2025 – Envision Energy, a global leader in green technology, has successfully completed a groundbreaking large-scale fire test for its smart energy storage system, significantly elevating safety, environmental responsibility, and system resilience benchmarks. Conducted under full on-site supervision by the Canadian Standards Association (CSA Group), strategic partners, and North American Fire Protection Engineers (FPEs), the test fully complied with the stringent CSA C800 standard, a consensus benchmark developed with input from insurers, regulators, and industry experts, establishing one of the most authoritative international safety standards for energy storage.

The test meticulously recreated real-world worst-case site conditions by placing four fully charged (100% SOC) 5MWh Envision Smart Energy Storage containers (A, B, C, D) in an ultra-dense back-to-back, side-by-side configuration. This setup featured an unprecedented 5-centimeter spacing between units, a stark contrast to the industry's typical 3 to 5 meters. This configuration represents the most energy-dense fire test layout ever attempted, substantially increasing the challenge due to heightened thermal coupling and limited airflow. Critically, the burn proceeded with zero intervention, allowing for a pure assessment of the system's inherent safety.

Even under unprecedented thermal stress and energy concentration, the system exhibited exceptional resilience and containment. Container A burned for 49 hours and 32 minutes, reaching a peak temperature of 1,297°C. Despite this extreme event, internal battery temperatures in the adjacent containers B, C, and D remained remarkably stable at just 35°C, 44°C, and 43°C respectively, well within normal operational parameters. Notably, container A maintained structural integrity throughout the burn, showing no deformation, collapse, or compromise of its sealing gaskets. More impressively, the test recorded zero fire spread or damage to neighboring containers, with post-test inspections confirming all internal modules in units B, C, and D remained fully operational and undamaged.

To simulate a worst-case ignition, the fire was initiated by applying high-power, synchronized heating to four battery cells within a modified pack, from which nano-level thermal insulation had been removed. The ignition source was strategically placed at the center of the container cluster, where fire spread risk is greatest. Under these extreme conditions, ignition took nearly three hours, over 50% longer than typical, offering a critical window for early detection and emergency response.

Environmental safety was a paramount focus throughout the test. All combustion gases from the burning container A were captured by overhead smoke hoods, analyzed for composition, and fully neutralized through advanced treatment. The entire 49-hour test produced no odors, no emissions, and zero pollution, setting a new industry benchmark for clean and environmentally responsible fire testing in energy storage. Envision's AI-powered Smart Energy Storage System integrates proprietary high-safety battery cells within a robust three-layer safety architecture spanning cell, pack, and system levels. Coupled with AI-driven fire detection and active pack-level firefighting, the system effectively isolates thermal events within a single container. To date, Envision's storage systems have been deployed in over 300 projects worldwide with zero safety incidents.

This breakthrough fire test quantifiably proves that even in highly unlikely fire scenarios, Envision's Smart Energy Storage can fully contain risk within a single container. The verifiable safety results provide insurers with greater confidence to underwrite storage assets, paving the way for broader commercial adoption and accelerating the global transition to safe, large-scale energy storage.