BYD has filed a patent for an innovative battery cabinet design that employs immersion cooling, where the battery modules are submerged in dielectric fluid. This setup poses challenges for maintaining electrical connections between an upper dry compartment housing electrical components and a lower liquid compartment containing the battery modules.
The patent, published by the China National Intellectual Property Administration on October 5, 2026, describes a two-chamber system: one chamber remains dry while the other is filled with dielectric fluid, allowing for efficient heat transfer. Unlike conventional battery systems that use indirect cooling through aluminum plates, this design directly places the battery modules in contact with the cooling fluid.
To address the challenge of electrical connectivity across the liquid barrier, BYD’s design routes the necessary connections through the upper part of the liquid chamber, minimizing the impact of hydrostatic pressure. This allows for the safe operation of electrical components while keeping them isolated from the dielectric fluid.
Although the patent details a novel enclosure architecture, it is not yet associated with any specific passenger vehicle application, and BYD has no announced plans for production at this time. The filing primarily focuses on the cabinet design and electrical routing strategy to manage the interaction between the liquid and dry compartments.
