The thermal management system of new energy vehicles includes: battery thermal management system, automotive air conditioning system, motor electronic control cooling system and reducer cooling system, which has a decisive impact on the mileage and battery life.

The most suitable temperature for the operation of the battery is between 0-38 ° C. at this time, there is no need for heating or cooling. Too high or too low temperature will lead to faster attenuation of battery life. Therefore, it is necessary to manage the battery temperature.

Different types of vehicles adopt different thermal management systems. The essence of thermal management is three strategies: cooling, thermal insulation and heating. At present, the thermal management system of new energy vehicles mainly focuses on cooling.

According to the cooling medium, it can be divided into air cooling, direct cooling and liquid cooling. Compared with direct cooling, liquid cooling has lower cost and better cooling effect than air cooling.

Air cooling is the mainstream application trend of new energy heat management system, which is widely used in early electric passenger vehicles. Liquid cooling is the most widely used new energy heat management system. It takes away the heat generated by the battery through liquid convection heat exchange to achieve the purpose of cooling.

There is also a direct cooling applied to medium and high-end models. It uses the principle of refrigerant evaporation latent heat to establish an air conditioning system in the whole vehicle or battery system. The refrigerant evaporates in the evaporator and quickly and efficiently takes away the heat of the battery system, so as to complete the cooling of the battery system. Direct cooling mode has the highest power, but the control strategy is the most difficult to do. It is more suitable for the requirements of high endurance and fast charging, followed by liquid cooling.