TIANWU Series Liquid-Cooling All-in-One Energy Storage Earns UL9540A Certification, Setting a New Industry Safety Benchmark

2025 . 02 . 19

The TIANWU series liquid-cooling all-in-one energy storage solution from WEIHENG has recently achieved the prestigious UL9540A certification. This globally recognized standard, developed by Underwriters Laboratories (UL), rigorously evaluates energy storage systems for safety under thermal runaway conditions. Widely regarded as one of the most stringent and authoritative safety assessments in the energy storage industry, UL9540A certification ensures reliable performance under extreme scenarios.

It is worth noting that this certification not only verifies the safety of the battery level but also distinguishes WEIHENG as one of the few companies in the industry to successfully pass the comprehensive UL9540A test for the energy storage system. This achievement highlights the exceptional safety performance and quality assurance of the TIANWU series and underscores WEIHENG’s rigorous commitment to innovation in energy storage technology and adherence to stringent safety standards.

Importance of UL9540A Certification

Thermal runaway, a phenomenon where a rapid rise in internal battery temperature can result in fires or explosions, has long been a significant public concern regarding energy storage systems. Achieving a UL9540A certification is a testament to exceptional technological and safety performance. This accomplishment also highlights WEIHENG’s TIANWU series unwavering commitment to delivering “ultimate safety” in energy storage solutions.

Rigorous Testing: Multi-Level Inspections Ensure System Safety

The performance of the TIANWU series was validated through a stringent and multi-tiered testing process:

• Battery Cell Testing: Assesses whether individual batteries can trigger thermal runaway under extreme conditions such as overcharging, high temperatures, or short circuits.
• Battery Module Testing: Checks whether thermal runaway can spread to other cells within the module.
• Energy Storage System Testing: Ensures that the entire system can effectively prevent the spread of fire and thermal runaway, maintaining safe operation.

By simulating harsh scenarios, including high temperatures, overloads, and mechanical shocks, these tests provided a comprehensive evaluation of the system’s safety and reliability.

Proof of safety: Outstanding Thermal Runaway Management

Test results demonstrated that TIANWU performs excellently during the thermal runaway process:

• The maximum temperature rise of surrounding walls was only 0.1°C, well below the standard requirement of ≤97°C.
• The highest internal temperature of adjacent energy storage cabinet walls was controlled at 31°C, lower than the standard valve-opening temperature limit of 168.2°C.
• No ignition or explosions occurred in the entire unit, the external wall temperature remained stable, and adjacent cabinets were unaffected.

Intelligent Fire Prevention: Multi-Layer Fire Safety System

The TIANWU series fire safety system incorporates cutting-edge temperature sensors, smoke detectors, and aerosol fire suppression systems. These components work together with a multi-layered fire control strategy, including audible and visual alarms, as well as proactive shutdown actions. This integrated approach enables the system to immediately respond to thermal runaway and take preventative measures, ensuring effective fire risk management throughout the product’s lifecycle. Continuous detection data is relayed to the PANGU OS (Energy Management System), allowing for real-time monitoring, intelligent early warnings, automated responses, and data logging.

WEIHENG remains dedicated to delivering the safest and most reliable energy storage solutions. Moving forward, we will continue to focus on innovation, drive industry progress, and ensure that each product not only meets but exceeds customer expectations.