*This content was translated by AI.
China's BYD has filed a patent for a new battery cabinet structure that directly immerses battery cell modules in an insulating liquid. According to reports from Chinese media on the 6th (local time), this patent, filed in March 2025 (publication number CN 122868832 A), features an innovative two-chamber enclosure architecture designed to simultaneously maximize thermal management efficiency and electrical safety for high-performance batteries.
According to the disclosed patent details, the battery cabinet system is physically divided into two independent compartments. The upper compartment consists of a dry chamber housing vehicle electronics, key electrical equipment, and connectors, while the lower compartment is designed as a liquid chamber where multiple battery cell modules are fully submerged in dielectric cooling fluid.
The core engineering challenge of this structure—electrical connections at the liquid-sealed interface—was resolved by safely routing wiring and connection points outside the liquid volume through the upper dry chamber. The crux of the patent lies in a design that actively leverages the excellent insulating and cooling properties of the coolant while thoroughly separating and maintaining the insulation and operational stability of electrical components and contacts that must not come into direct contact with the coolant, through the physical layout of the cabinet.
This patent should be viewed not merely as a method of using individual cooling fluids, but as an emphasis on enclosure cabinet structure design that physically isolates liquid cooling environments from electrical equipment. With this patent, BYD has gained a key to further refreshing its image as a technology company. The process of watching how this patent will be commercialized remains ahead.
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*This content was translated by AI.
