Electric buses have specific requirements for low - temperature thermal management to ensure battery performance, passenger comfort, and the normal operation of vehicle systems. Here are some common low - temperature thermal management product offerings and system solutions for electric buses:
PTC Heaters:
Working Principle and Characteristics: PTC (Positive Temperature Coefficient) heaters are crucial components of electric bus thermal management systems. As the temperature rises, the electrical resistance of the PTC heating element automatically increases, preventing overheating without the need for external thermostats or complex wiring. For example, the PTC heaters developed by our NF group have a thermal conversion efficiency of over 95% and can quickly heat up. They can automatically adjust the power according to the temperature, reducing power consumption when the set temperature is reached.
Power and Application Range: PTC heaters in electric buses are designed for 400 - 800V DC systems, with powers ranging from 1kW to 35kW or more. They can be used for quickly heating the cab and conditioning the battery.
Battery Thermal Management Systems (BTMS)：
Independent Battery Thermal Management Systems: Take the Cling EFDR series independent battery thermal management system as an example. It is driven by its own compressor and can be installed on the chassis. It has a wide operating temperature range of - 20 °C to 60 °C and offers different cooling capacities (3kW, 5kW, 8kW, 10kW) with heating function reserves of 5kW, 10kW, 14kW, and 24kW for selection. This system can work under the command of the Battery Management System (BMS) to cool or heat the coolant carrier, ensuring that the battery operates within an optimal temperature range (10 - 30 °C).
Integrated Battery Thermal Management Solutions: NF's 10kW battery thermal management system is suitable for 11 - 12 meter electric buses. It has a cooling capacity of 8 - 10kW and a heating capacity of 6 - 10kW. It can maintain the battery temperature in the shortest possible time through a larger coolant flow and has precise temperature control (± 0.5 °C).
Post time: Oct-23-2025
