BYD patent details two-chamber immersion cooling system for energy storage cabinets
A patent publication reveals BYD is developing a dual-compartment immersion cooling enclosure that submerges stationary storage cells in dielectric fluid while isolating electrical gear in an upper dry chamber.
- CN 122868832 A
- March 2025
What Happened
China's intellectual property authority CNIPA released document CN 122868832 A describing an enclosure design for stationary energy storage cabinets. First lodged during March 2025, the submission outlines an architecture where cell packs sit immersed in hydrocarbon- or ester-based dielectric fluid rather than relying on external aluminium cold plates.
The cabinet layout segregates hardware into an upper dry section housing electrical components and a lower flooded volume enclosing the submerged cell packs. Rather than penetrating bottom or lateral container walls, power leads and sensor wiring travel upward through the top zone of the flooded compartment before entering the dry enclosure.
Positioning the boundary higher up leverages fluid depth characteristics: hydrostatic fluid pressure remains lowest near the surface of the liquid column, reducing mechanical stress on watertight terminal seals. While indirect liquid cooling remains standard across BYD's commercial MC Cube storage family and competing CATL EnerOne platforms, the filing demonstrates exploratory engineering into direct liquid submersion, though substantive examination remains ongoing with no production timeline confirmed.
CN 122868832 Apublication
CNIPA patent document
March 2025filing
patent submission date
Why this matters
Direct liquid immersion eliminates conventional cold plates to accelerate heat extraction from energy storage battery modules. BYD's physical separation architecture targets sealing reliability by routing electrical conductors through regions of reduced hydrostatic pressure.
Terms in This Story
- Immersion Cooling
- A thermal management approach where electrical components or battery cells are completely submerged in a thermally conductive but electrically insulating dielectric liquid.
A brief summary; details can be imperfect — always verify against the original source.