Compared with the traditional automotive thermal management system, the difference between the new energy vehicle thermal management system is that the management object extends from the cockpit to the battery, motor electronic control and other fields, and the second is that its function extends from simple cooling to heat preservation and heating functions . Therefore, compared with traditional vehicles, the thermal management system of new energy vehicles adds electronic water pumps, electric compressors, electronic expansion valves or four-way valves, cooling plates and heating systems (heat pumps or PTC systems), etc.