New energy vehicle cooling system: refrigeration+liquid Cooling will become the main development direction

  The cooling system in the new energy power battery pack can achieve the purpose of cooling the new energy power battery pack. There are three types of new energy power battery heat dissipation methods: air forced cooling, liquid cooling and refrigeration.

  In the air -cooled mode, the cooling system uses natural wind or fans, and the evaporator comes with the car is used to cool the battery;

  In the water cooling mode, the radiator and the working liquid circulation system will generally be coupled, and the battery heat is taken away through the coolant;

  In the refrigeration mode, the cooling system uses the principle of evaporating the heat of refrigerant to establish an air -conditioning system in the vehicle or battery system, and install the evaporator of the air -conditioning system in the battery system. The heat of the battery system is taken away to complete the operation of the battery system.

  Air cooled technology

  Air cooled technology is the most widely used cooling technology in new energy power batteries. Forced airflow can be generated through the fan, or it can also be generated by using the facial air or compressed air during the car travel process. Compared with other technologies, air -cooled technology is relatively simple, safe, and convenient for maintenance. Japan Toyota's hybrid electric electric vehicle PRIUS and Honda's Insight use the form of air -cooled. The thermal management system developed by Nissan and GM car companies mainly adopts the form of compulsory wind and cold.

Various types of new energy power batteries in China basically use air -cooled technology. Domestic technology is basically equivalent to foreign levels. It can achieve good heat dissipation performance under low cost.

Compared with liquid cooling technology, the heat exchange coefficient between air -cooled technology and the surface of the battery, slow cooling and heating speed, the temperature uniformity of the internal temperature of the battery box is not easy to control, the sealing design of the battery box is difficult, dustproof and waterproof effects Equipment.

  Water cooled technology

The water cooled cooling system mainly includes: electronic water pump, heat exchanger, heat sink, PTC heater, expansion water tank.

Water cooled technology is a cooling technology based on liquid heat exchange. It is more efficient than air cooled technology. The temperature of the electric vehicle battery pack is more uniform. It can be integrated with the cooling system of the vehicle. Fast heating speed. However, the system that uses water -cooled technology is more complicated, the weight is large, the maintenance and maintenance is difficult, and there is a possibility of leakage.

The research on water cooled technology abroad is earlier, and the application time is also long. With continuous exploration, practice and improvement, the system's thermal exchange coefficient and cooling heating speed have reached a good level, and the application of new materials, and the application of new materials. The weight of foreign water -cooled systems has also been reduced.

At present, water cooled technology is mainly used in Tesla, GM Volt, French Peugeot Citroen, BMW i3 and other automotive brands. The Tesla Model S model uses water -cooled technology to cool the battery. Tesla conducted a very deep design on its battery arrangement, thermal management system, and battery management system to ensure that each battery unit is under regulatory, and its status data can be feeded and processed at any time. For a small battery unit with a small volume, Tesla closed it independently in the steel compartment. At the same time, the liquid cooling system can be specifically cooled for each battery unit, reducing each other's temperature difference, and relatively reduced the combustion of the battery risk.