Fuchs and Windey Innovolts validated the long-term stability of an immersion energy storage system following more than 3,000 hours of continuous testing completed in November 2025. The companies released what they said is the industry’s first long-term test white paper on immersion energy storage in China.
The paper demonstrates stable long-term operation and supports the technology’s suitability for large-scale deployment. It also outlines a structured testing methodology that the partners described as an “immersion energy storage lifespan assessment” framework, intended to help establish unified technical standards and reduce market trust barriers, thereby accelerating commercial adoption.
Windey Innovolts is a subsidiary of Windey Energy, a large state-owned enterprise based in Hangzhou, Zhejiang province. The validation is aimed at supporting wider adoption of immersion energy storage systems in China’s rapidly expanding energy storage market.
Immersion energy storage submerges battery cells and power electronics in a dielectric cooling fluid that directly removes heat from critical components. Compared with conventional air- or liquid-cooled systems, immersion designs offer improved thermal management, enhanced safety and longer system life, making them attractive for grid-scale stationary energy storage applications.
Fuchs has been expanding its presence in the segment through the development of dielectric immersion cooling fluids, technology demonstrations and strategic partnerships. The company has showcased immersion solutions for energy storage and related applications at industry events, launched UL-certified immersion cooling fluids, and partnered with technology providers to advance liquid cooling systems for battery energy storage and data center applications.