World’s first 800V immersion-cooled battery targets power-hungry AI data centers

BBx800 is designed specifically for high-power AI data centers. It uses full immersion cooling, placing each battery cell directly into insulating fluid. The design maintains operating temperatures between 25°C and 27°C over long periods. The approach aims to reduce thermal runaway risk and improve system stability under extreme loads.

The module measures 2 OU in height and supports voltage configurations of ±400V or 800V. A standard 20 OU rack can deliver peak output of up to 1 MW for three minutes, or 1.2 MW for 90 seconds. The system targets short-duration backup needs during rapid power fluctuations and peak AI workloads. AI drives voltage shift Rising AI compute density has pushed data center power requirements sharply higher.

Per-rack demand has increased from roughly 100 kW to more than 1 MW in some deployments. Traditional 48V architectures face growing constraints linked to current levels, thermal stress, and efficiency losses. In 2025, NVIDIA announced plans to promote an 800V high-voltage direct current architecture for next-generation AI data centers. The higher-voltage approach lowers current and improves efficiency but introduces new engineering challenges.

These include insulation design, fault isolation, thermal runaway mitigation, electromagnetic compatibility, and safety certification. XING Mobility positions BBx800 as a response to those challenges. The company says immersion cooling enables tighter thermal control at high voltages while improving safety margins. The design also allows high power density within a compact rack footprint.

Automotive validation underpins design XING Mobility s move into data center infrastructure builds on nearly a decade of automotive development. Since 2015, the company has worked on 400–800V battery systems qualified for vehicle use. That work included European regulatory certification, 100,000-kilometer durability testing with Japanese automakers, and extreme-condition trials conducted with Kubota.

Those programs required solutions for high-voltage insulation, electric shock protection, and thermal management under continuous stress. The company now applies that experience to stationary backup systems, where failure tolerance remains low. The same immersion-cooled platform also supports Caterham s Project V, an all-electric sports car concept. The vehicle uses XING Mobility s IMMERSIO cell-to-pack architecture to reduce weight while maintaining thermal stability.

Caterham plans to unveil a production prototype at Tokyo Auto Salon 2026. Alongside BBx800, XING Mobility will also debut the IMMERSIO XBE1000 energy storage cabinet. The system supports configurations from 200 kWh to 1 MWh and targets grid-scale and high-power applications. With BBx800, XING Mobility signals that 800V immersion-cooled batteries are no longer limited to vehicles, as AI data centers drive demand for safer, denser, and more efficient power systems.