From April 1 to 3, 2026, the 14th International Energy Storage Summit and Exhibition (ESIE 2026) will be held in Beijing. Haichen Energy Storage showcased its comprehensive, all-scenario energy storage solutions, highlighting innovative offerings such as the ∞Cell 1175Ah long-duration energy storage battery and system, as well as the AIDC full-duration energy storage solution. At the exhibition, Haichen Energy Storage officially released the complete results of its large-scale fire test on the ∞Power 6.25 MWh, 4-hour long-duration energy storage system and was awarded a large-scale fire-test certification certificate by UL Solutions, an internationally recognized authority. This is the world’s first long-term energy storage system with a thousand-hour battery core opening fire test , setting a new industry benchmark for the safety verification of long-term energy storage systems.
haichen energy storage booth
results sharing to promote the upgrading of industry safety awareness
during the exhibition, haichen energy storage held” the world’s first UL certification ceremony for large-scale burning test of battery cell energy storage systems exceeding 1,000 hours “. At the meeting, Chen Jiawu, head of Haichen energy storage combustion test project and senior fire protection design engineer, introduced in detail the design idea and implementation process of the test. The test video played on the spot showed the whole test process, key technical nodes and final data results. Through this open and transparent technical sharing, Hecen Energy Storage has transformed an extreme safety validation test into tangible, reusable industry best practices, further solidifying the industry consensus that long-duration energy storage system safety should evolve from “design-controllable” to “safety-verifiable.”
large-scale fire test technology sharing
UL on-site certification, system safety recognized by international authority
in the certification process, Chen chi, senior product manager of UL Solutions energy and automation Asia Pacific division, said, UL 9540A Version 6 (released in March 2026) has upgraded safety verification from batteries and modules to real fire scenarios at the whole cabinet and whole station level. This time, Hecen Energy Storage’s 6.25MWh long-duration energy storage system, featuring kilo-ampere-hour-class batteries, underwent a full-door, large-scale fire test in strict accordance with this version, simulating the most hazardous “unconfined” fully developed fire scenario. It successfully passed extreme-condition testing, demonstrating the reliability of its passive safety design for long-duration energy storage systems and providing important practical guidance for refining global energy-storage safety standards.
This certification signifies that Haichen Energy Storage products have achieved an internationally leading level of safety. As the sixth edition of UL 9540A has been adopted by regulatory authorities in the United States, Europe, Australia, the Middle East, and other regions as an additional market-access requirement, passing this test signifies that the company’s 6.25MWh long-duration energy storage system now meets these stringent market-entry criteria, thereby establishing a robust safety foundation for its global expansion.
the certification ceremony
is safe and can be seen. the world’s first 6.25MWh 4h long-term energy storage system limit test
previously, under the witness of UL Solutions and other authorities and experts, the 6.25MWh 4h long-term energy storage system has carried out limit fire verification in strict accordance with the latest standards of UL9540A 2025 and NFPA855-2026. The test setup maintained the prefabricated container with both doors fully open, arranged “back-to-back, side-by-side” at a minimal 15cm spacing, and operated the battery cells at 100% state of charge (SOC) while actively disabling the automatic fire-suppression system. These stringent boundary conditions were employed to comprehensively validate the overall safety performance of the high-energy-density energy-storage system.
Test results showed that, under sustained combustion conditions, the system successfully contained the fire within a single pre-fabricated module, preventing thermal spread to adjacent modules. After the fire was extinguished, the steel module structure remained intact, with no significant collapse or structural deformation. This confirms its reliable performance in real-fire scenarios, maintaining both structural integrity and functional isolation. The results provide a reproducible, traceable, and credible safety engineering benchmark for the large-scale deployment of long-duration energy storage systems worldwide.
Eco-System Collaboration: “Lighthouse Factory” Leads Smart Manufacturing to New Heights
At the exhibition, Hecen Energy Storage, together with several ecosystem partners, organized engaging interactive check-in activities. Centered on the core advantages of the ∞Cell 1175Ah long-duration energy storage battery cell, two highlight segments were set up: a “Joint Booth Product Check-In” and a “Main Booth Lighthouse Factory Themed Check-In.” These initiatives drew large crowds who stopped to exchange ideas and immerse themselves in hands-on experiences. Notably, in January 2026, Hecen Energy Storage’s Chongqing facility was recognized as the world’s first “Lighthouse Factory” in the energy storage battery industry, boasting the world’s first production line dedicated to long-duration energy storage batteries. The base has deployed over 40 digital solutions, deeply integrating cutting-edge technologies such as generative AI, ML, and AIoT to build a full-chain intelligent control system spanning R&D, material selection, manufacturing, and finished-product inspection. This ensures exceptional consistency, thereby solidifying the foundation for energy-storage batteries in terms of high safety, high reliability, and high performance. On-site interactive activities allowed attendees to experience firsthand Hecen Energy Storage’s global leadership in long-duration energy storage technologies and advanced, high-precision manufacturing. Building on the findings of this fire-test campaign as a cornerstone of safety, and leveraging the technological innovations of the ∞Cell 1175Ah 1,000-ampere-hour battery cell together with the extreme intelligent manufacturing capabilities of Chongqing’s “Lighthouse Factory,” Haichun Energy Storage is accelerating the large-scale deployment of long-duration energy storage solutions. Looking ahead, Haichen Energy Storage will continue to focus on the core long-duration energy storage segment. Leveraging its verifiably safe product capabilities, scalable delivery execution, and comprehensive, all-scenario solution offerings, the company will collaborate with global partners to jointly drive high-quality development of the energy storage industry and support a steady, sustained global energy transition.
