Thermal management system of pure electric vehicle, control method and pure electric vehicle

The invention provides a thermal management system of a pure electric vehicle, a control method and the pure electric vehicle. The system can flexibly use various current heating energy-saving technologies, such as a heat pump technology, electric drive waste heat utilization, heat utilization and passenger compartment waste heat recovery. The system comprises a first refrigerant circulation loop, a second refrigerant circulation loop, a first cooling liquid circulation loop, and a second cooling liquid circulation loop; The first cooling liquid circulation loop and the second cooling liquid circulation loop are communicated through a first three-way valve, a second three-way valve, a first four-way valve and a second four-way valve. The first three-way valve, the second three-way valve, the first four-way valve and the second four-way valve are controlled, so that the cooling liquid in the second cooling liquid circulation loop flows into the first cooling liquid circulation loop and then flows back to the s