16/05/2025
In the competitive landscape of core components for electric vehicle thermal management systems, Tesla's Octovalve was once regarded as an industry benchmark. However, a teardown report of the BYD Seal reveals a groundbreaking innovation — the Nonavalve, which is redefining the logic of heat management through its unique architecture.
This central control module integrates nine solenoid valves (six switching valves and three expansion valves) and connects to the compressor, condenser, HVAC system, and battery via ten refrigerant pipelines, making it the “energy commander” that orchestrates the thermal flow across the entire vehicle.
Unlike Tesla's approach, which relies on coolant-loop integration for thermal management, the BYD Seal adopts a dual-loop design that couples direct refrigerant cooling with traditional water cooling: the motor and inverter are cooled via a dedicated water circuit, while the HVAC and battery thermal management are handled directly by refrigerant flow.
This system architecture enables the Nonavalve to operate in eight different modes, covering various combinations of HVAC and battery heating/cooling scenarios. As a result, it ensures efficient energy distribution across a wide temperature range of -30°C to 50°C.
See more information at: https://www.guchen.com/battery-solutions/refrigerant-side-thermal-management-module.html
