Since pure electric vehicles lack an internal combustion engine, they cannot utilize waste engine heat for cabin heating. Furthermore, they require battery pack heating in low-temperature conditions to maintain driving range. Consequently, these vehicles employ PTC heaters to supply heat to both the cabin HVAC system and the battery thermal management system. The heater’s overall structure comprises a radiator (containing the PTC heating assembly), coolant flow channels, a main control board, high-voltage and low-voltage connectors, and an upper housing; it is an integral component of the vehicle’s thermal management system.
A PTC coolant heater for new energy vehicles is a device that utilizes PTC heating elements to warm the vehicle’s coolant. Its primary function is to provide thermal energy in low-temperature environments, ensuring the proper operation of critical components such as the motor and battery.
PTC heating elements are self-regulating thermistor components characterized by high efficiency, stability, and reliability. When an electric current passes through the PTC element, it generates heat, raising the element’s surface temperature to warm the coolant. Compared to traditional electric heaters, PTC coolant heaters offer advantages such as self-regulating power output and stable temperature control.
In cold conditions, the PTC coolant heater adjusts its heating power and temperature by regulating the current, maintaining the coolant within an optimal temperature range to ensure the reliable operation of key components like the motor and battery. Additionally, the heater’s high efficiency allows it to rapidly warm the coolant to the required temperature, thereby shortening vehicle warm-up times and enhancing driving comfort and safety.
Testing for PTC coolant heaters primarily covers electrical performance, EMC (Electromagnetic Compatibility), and fluid performance. The New Energy Laboratory at Unilab Testing is capable of conducting comprehensive testing for PTC heaters.
Post time: Sep-30-2026
