Electric vehicle multi-source heat management system, control method and vehicle

Abstract

The application discloses a kind of electric vehicle multi-source heat management system, control method and vehicle, belong to new energy automobile heat management technical field, management system includes cabin heat module, battery heat module and motor / electronic control heat module, cabin heat module includes air conditioner box, air conditioner evaporator, air conditioner warm air core and air conditioner blower are arranged in air conditioner box, battery heat module includes power battery, motor / electronic control heat module includes DC / DC module, motor controller and drive motor;Refrigerant circulation loop flows through air conditioner evaporator, to realize cabin cooling;Waterway circulation loop flows through air conditioner warm air core, to realize cabin heating, waterway circulation loop flows through power battery, to realize battery heating or cooling, waterway circulation loop flows through DC / DC module, motor controller and drive motor, to realize motor / electronic control cooling.The application can realize the comprehensive utilization and reasonable distribution of heat pump air conditioner, whole vehicle motor / electronic control waste heat, heat source is rich, and overall structure is simple and high in applicability.

Description

Technical Field

[0001] This invention relates to a multi-source thermal management system, control method, and vehicle for electric vehicles, belonging to the field of thermal management technology for new energy vehicles. Background Technology

[0002] With the continuous promotion and application of new energy vehicles in China, electric vehicles are gradually becoming a part of production and daily life. The price and energy consumption of electric vehicles are receiving increasing attention, becoming important indicators for evaluating their quality. Reducing the price and energy consumption of electric vehicles are inextricably linked to the vehicle's thermal management system. While current thermal management systems for new energy vehicles have achieved component integration and heat reuse, some redundant components still exist, such as backup PTC heaters for battery heating and cabin heating. Although some thermal management systems use heat pump air conditioning by absorbing heat from the air or waste heat from the motor, the heat source is relatively singular, the structure is complex, and the applicability is limited. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a multi-source thermal management system, control method and vehicle for electric vehicles, which can realize the comprehensive utilization and rational distribution of waste heat from heat pump air conditioning and vehicle motor / electronic control, with abundant heat sources, and simple overall structure and high applicability.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention discloses a multi-source thermal management system for electric vehicles, comprising a cabin thermal module, a battery thermal module, and a motor / electronic control thermal module. The cabin thermal module includes an air conditioning unit, which houses an air conditioning evaporator, an air conditioning heater core, and an air conditioning blower. The battery thermal module includes a power battery. The motor / electronic control thermal module includes a DC / DC module, a motor controller, and a drive motor. It also includes a refrigerant circulation loop and a water circulation loop. The refrigerant circulation loop flows through the air conditioning evaporator to cool the cabin. The water circulation loop flows through the air conditioning heater core to heat the cabin. The water circulation loop flows through the internal water channels of the power battery to heat or cool the battery. The water circulation loop flows through the internal water channels of the DC / DC module, the motor controller, and the drive motor to cool the motor / electronic control system.

[0006] The refrigerant circulation loop includes an electric compressor. The outlet of the electric compressor passes through the first port ① and the second port ② of an LCC heat exchanger and then splits into two paths. One path passes through the first electronic expansion valve and then connects to the inlet of the air conditioner evaporator. A pressure sensor is installed at the second port ② of the LCC heat exchanger. The other path splits into two branches. One branch passes through the second electronic expansion valve and the second port ② and the fourth port ④ of the first plate heat exchanger. The other branch passes through the third electronic expansion valve and the second port ② and the fourth port ④ of the second plate heat exchanger. The fourth port ④ of the first plate heat exchanger and the fourth port ④ of the second plate heat exchanger merge for the first time, and then merge a second time with the outlet of the air conditioner evaporator and connect to the inlet of the gas-liquid separator. The outlet of the gas-liquid separator is connected to the inlet of the electric compressor.

[0007] The water circulation loop includes a first four-way valve, a second four-way valve, and a third four-way valve. The fourth port of the third four-way valve sequentially passes through the first port and the fourth port of the first plate heat exchanger before connecting to the first port of the second four-way valve. The second port of the third four-way valve is connected to the inlet of the third water pump. The outlet of the third water pump sequentially connects to the air conditioning heating core and the third port of the LCC heat exchanger. The fourth port of the LCC heat exchanger sequentially connects to the PTC water heater and the fourth port of the first four-way valve. The second port of the second four-way valve is connected to the inlet of the second water pump. The outlet of the second water pump sequentially passes through the internal water channels of the DC / DC module, the motor controller, and the drive motor, before connecting to the first port and the third port of the first three-way valve. The first radiator is connected to the third four-way valve at port ③. A first radiator fan is installed on the first radiator. The second three-way valve at port ② is connected to the outlet of the first radiator. The fourth port of the second four-way valve is connected to the first port ① after passing through the first and third ports of the second plate heat exchanger. The second port of the first four-way valve is connected to the inlet of the first water pump after passing through the internal water channel of the power battery. The outlet of the first water pump is connected to the third port of the second four-way valve. The fourth port of the first four-way valve is connected to the inlet of the fourth water pump. The outlet of the fourth water pump is connected to the third port of the second three-way valve after passing through the second radiator. A second radiator fan is installed on the second radiator.

[0008] It includes a first expansion tank, the outlet of which is connected to the inlet of the first water pump.

[0009] It includes a second expansion tank, the outlet of which is connected to port ③ of the third four-way valve.

[0010] Secondly, this invention discloses a control method for a multi-source thermal management system for electric vehicles, comprising:

[0011] In high-temperature environments, the control method for vehicle charging / driving / parking scenarios includes the following control modes: controlling cabin cooling, controlling battery cooling, controlling simultaneous cooling of cabin and battery, and controlling motor / electronic control system cooling.

[0012] In low-temperature environments, the control method for vehicle charging / parking scenarios includes the following control modes: controlling cabin heating, controlling battery temperature rise, simultaneously heating the cabin and battery, and controlling battery cooling.

[0013] In low-temperature vehicle driving scenarios, the control method includes the following control modes: controlling cabin heating, controlling battery heating, and controlling simultaneous heating of the cabin and battery.

[0014] Applications include vehicle charging / driving / parking scenarios in high-temperature environments, including the following control methods:

[0015] A1, Cabin Cooling Control Method: The electric compressor is started, and the refrigerant passes through the LCC heat exchanger (ports ① and ② of port 2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger, and the refrigerant releases heat and condenses into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the first electronic expansion valve. At this time, the second and third electronic expansion valves are in the closed state. After the refrigerant passes through the first electronic expansion valve and the pressure is reduced, the liquid refrigerant absorbs heat from the air and evaporates into gas inside the air conditioning evaporator. Then, the air conditioning blower sends the low-temperature air to the cabin, and the cabin temperature decreases. The gaseous refrigerant passes through the gas-liquid separator and returns to the electric compressor, completing the refrigerant cycle.

[0016] Simultaneously, the fourth water pump is started, and the heat exchange medium passes through the second radiator. The second radiator fan draws in outside air to exchange heat with the second radiator, carrying away the heat of the heat exchange medium and lowering its temperature. The low-temperature heat exchange medium passes through the first and second ports of the second three-way valve, and the third and fourth ports of the LCC heat exchanger. Inside the LCC heat exchanger, the low-temperature heat exchange medium exchanges heat with the high-temperature refrigerant. The refrigerant releases heat and condenses into liquefaction. Then, the heat exchange medium returns to the first water pump through the PTC water heater and the third and fourth ports of the first four-way valve, completing the water circulation.

[0017] A2, Battery Cooling Control Method: The electric compressor is started. The refrigerant passes through ports ① and ② of the LCC heat exchanger. The refrigerant exchanges heat with the water circuit inside the LCC heat exchanger, releasing heat and condensing into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the third electronic expansion valve. At this time, the first and second electronic expansion valves are closed. After the refrigerant passes through the third electronic expansion valve and its pressure is reduced, it flows into ports ② and ④ of the second plate heat exchanger. Inside the second plate heat exchanger, the liquid refrigerant absorbs heat from the water circuit and evaporates into gas. Then, it passes through the gas-liquid separator and returns to the electric compressor to complete the cycle.

[0018] Simultaneously, the fourth water pump is started, and the heat exchange medium passes through the second radiator. The second radiator fan draws in outside air to exchange heat with the second radiator, carrying away the heat of the heat exchange medium and lowering its temperature. The low-temperature heat exchange medium passes through the first and second ports of the second three-way valve, and the third and fourth ports of the LCC heat exchanger. Inside the LCC heat exchanger, the low-temperature heat exchange medium exchanges heat with the high-temperature refrigerant. The refrigerant releases heat and condenses into liquefaction. Then, the heat exchange medium returns to the first water pump through the PTC water heater and the third and fourth ports of the first four-way valve, completing the water circulation.

[0019] Simultaneously with the start of the electric compressor, the battery circulation loop is activated, controlling the first water pump to start working. The heat exchange medium flows into the first and third ports of the second plate heat exchanger through the third and fourth ports of the second four-way valve. The refrigerant evaporates and absorbs heat at the second plate heat exchanger, absorbing and carrying away the heat in the heat exchange medium, thus turning the heat exchange medium into a low-temperature heat exchange medium. Then, the low-temperature heat exchange medium enters the internal water channel of the power battery through the first and second ports of the first four-way valve, absorbing and carrying away the heat in the power battery, and then returns to the first water pump to complete the circulation and achieve battery cooling.

[0020] A3, simultaneous cabin and battery cooling control method: The electric compressor is started, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger, and the refrigerant releases heat and condenses into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the first electronic expansion valve and the third electronic expansion valve respectively. At this time, the second electronic expansion valve is in the closed state. Then the refrigerant runs according to the cabin cooling and battery cooling routes respectively to achieve the simultaneous cooling requirements of the cabin and battery.

[0021] A4, Motor / Electrical Control Cooling Method: The second water pump is started, and the heat exchange medium enters the internal water channel of the motor / electric control unit to absorb the heat generated by the DC / DC module, motor controller, and drive motor. Then, the heat exchange medium enters the first radiator through ports ① and ③ of the first three-way valve. The fan of the first radiator starts to draw in outside air to exchange heat with the first radiator. The outside air carries away the heat of the heat exchange medium, reducing its temperature. Then, the heat exchange medium returns to the second water pump through ports ③ and ④ of the third four-way valve, ports ① and ③ of the first plate heat exchanger, and ports ① and ② of the second four-way valve, completing the cycle.

[0022] For vehicle charging / parking modes in low-temperature environments, the following control methods are included:

[0023] B1, Cabin heating control method:

[0024] Mode 1: The third water pump is started and the heat exchange medium enters the air conditioning unit's heating core. The blower draws air into the air conditioning unit, where it is heated by the heating core and its temperature rises. The heated air then enters the cabin, raising its temperature. The heat exchange medium enters the PTC water heater through ports 3 and 4 of the LCC heat exchanger to absorb the heat generated by the heater's power consumption, raising its temperature again. The high-temperature heat exchange medium then flows through ports 3 and 4 of the first four-way valve, the fourth water pump, the second radiator, ports 1 and 3 of the second three-way valve, and ports 1 and 2 of the third four-way valve back to the third water pump, completing the cycle.

[0025] Mode 2: The third water pump is started and the heat exchange medium enters the air conditioning unit's heating core. The blower draws air into the air conditioning unit, where it is heated by the heating core and its temperature rises. The heated air then enters the cabin, raising its temperature. The heat exchange medium enters ports ③ and ④ of the LCC heat exchanger. At this point, the heat generated by the condensation and liquefaction of the high-temperature refrigerant heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater, ports ③ and ④ of the first four-way valve, the fourth water pump, the second radiator, ports ① and ③ of the second three-way valve, ports ① and ② of the third four-way valve, and returns to the third water pump, completing the cycle.

[0026] Simultaneously, the electric compressor is started, and the refrigerant passes through the first and second ports of the LCC heat exchanger. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger, and the refrigerant releases heat and condenses into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve 6. At this time, the first and third electronic expansion valves are in the closed state. After the refrigerant passes through the second electronic expansion valve for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator 10) and returns to the electric compressor, completing the refrigerant cycle.

[0027] Simultaneously, the second water pump is started. The heat exchange medium enters the first radiator through the DC / DC module, motor controller, drive motor, and ports ① and ③ of the first three-way valve. The fan of the first radiator starts to draw in outside air and exchange heat with the first radiator. The outside air heats the heat exchange medium, raising its temperature. Then, the heat exchange medium passes through ports ③ and ④ of the third four-way valve and ports ① and ③ of the first plate heat exchanger. Inside the first plate heat exchanger 7, the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into a gaseous state, lowering the temperature of the heat exchange medium. Then, it returns to the second water pump through ports ① and ② of the second four-way valve, completing the cycle.

[0028] Mode 3: The third water pump is started and the heat exchange medium enters the air conditioning unit's heating core. The blower draws air into the air conditioning unit, where it is heated by the heating core and its temperature rises. The heated air then enters the cabin, raising its temperature. The heat exchange medium enters ports ③ and ④ of the LCC heat exchanger. At this point, the heat generated by the condensation and liquefaction of the high-temperature refrigerant heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater, ports ③ and ④ of the first four-way valve, the fourth water pump, the second radiator, ports ① and ③ of the second three-way valve, ports ① and ② of the third four-way valve, and returns to the third water pump, completing the cycle.

[0029] Simultaneously, the electric compressor is started, and the refrigerant passes through the first and second ports of the LCC heat exchanger. The refrigerant exchanges heat with the water circuit inside the LCC heat exchanger, releasing heat and condensing into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the third electronic expansion valve. At this time, the first and second electronic expansion valves are in the closed state. After the refrigerant passes through the third electronic expansion valve for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium inside the second plate heat exchanger and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator and returns to the electric compressor, completing the refrigerant cycle.

[0030] Simultaneously, the battery circulation loop is activated, controlling the first water pump to start working. The heat exchange medium flows into the first and third ports of the second plate heat exchanger through the third and fourth ports of the second four-way valve. The refrigerant evaporates and absorbs heat at the second plate heat exchanger, absorbing and carrying away the heat in the heat exchange medium, turning it into a low-temperature heat exchange medium. Then, the low-temperature heat exchange medium enters the internal water channel of the power battery through the first and second ports of the first four-way valve, absorbing and carrying away the heat from the power battery, raising the temperature of the heat exchange medium, and then returning to the first water pump to complete the cycle.

[0031] B2, Battery temperature control method:

[0032] Mode 1: The first water pump is turned on and the heat exchange medium passes through the second four-way valve (ports 3 and 4 of 22, ports 1 and 3 of the second plate heat exchanger 5, ports 1 and 4 of the first four-way valve, the fourth water pump, the second radiator, and ports 1 and 2 of the second three-way valve 15). The heat exchange medium enters the PTC water heater to absorb the heat generated by the heater's power consumption and its temperature rises. The high-temperature heat exchange medium passes through ports 3 and 2 of the first four-way valve and enters the internal water channel of the power battery. The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, and the power battery temperature rises. Then it returns to the first water pump to complete the cycle. The heat generated by the PTC water heater's power consumption is exchanged with the power battery to achieve battery heating.

[0033] Mode 2: The first water pump starts working. The heat exchange medium passes through ports 3 and 4 of the second four-way valve, ports 1 and 3 of the second plate heat exchanger, ports 1 and 4 of the first four-way valve, the fourth water pump, the second radiator, ports 1 and 2 of the second three-way valve, and enters ports 3 and 4 of the LCC heat exchanger. At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater and ports 3 and 2 of the first four-way valve and enters the internal water channel of the power battery. The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, the power battery temperature increases, and then returns to the first water pump to complete the cycle.

[0034] Simultaneously, the electric compressor (1) is started, and the refrigerant passes through the first and second ports of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger, and the refrigerant releases heat and condenses into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve. At this time, the first and third electronic expansion valves are in the closed state. After the refrigerant passes through the second electronic expansion valve for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator and returns to the electric compressor, completing the refrigerant cycle.

[0035] Simultaneously, the second water pump is started. The heat exchange medium enters the first radiator through the DC / DC module, motor controller, drive motor, and ports ① and ③ of the first three-way valve. The fan of the first radiator starts to draw in outside air and exchange heat with the first radiator. The outside air heats the heat exchange medium, raising its temperature. Then, the heat exchange medium passes through ports ③ and ④ of the third four-way valve and ports ① and ③ of the first plate heat exchanger. Inside the first plate heat exchanger, the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into a gaseous state, lowering the temperature of the heat exchange medium. Then, it returns to the second water pump through ports ① and ② of the second four-way valve, completing the cycle.

[0036] B3, simultaneous cabin and battery temperature control method:

[0037] The third water pump is started, and the heat exchange medium enters the air conditioning heating core of the air conditioning unit. The blower draws air into the air conditioning unit and heats it through the heating core (11), raising its temperature. The heated air then enters the cabin, raising its temperature. The heat exchange medium enters the PTC water heater through the ③ and ④ ports of the LCC heat exchanger to absorb the heat generated by the heater's power consumption, raising its temperature again. The high-temperature heat exchange medium enters the internal water channel of the power battery through the ③ and ② ports of the first four-way valve. The high-temperature heat exchange medium exchanges heat with the power battery, lowering its temperature and raising its temperature. Then, it passes through the first water pump, the ③ and ④ ports of the second four-way valve, the ① and ③ ports of the second plate heat exchanger, the ① and ④ ports of the first four-way valve, the fourth water pump (18), the second radiator, the ① and ③ ports of the second three-way valve, and the ① and ② ports of the third four-way valve (21), returning to the third water pump to complete the cycle.

[0038] B4, Battery cooling control method:

[0039] The first water pump is activated. The heat exchange medium flows through ports 3 and 4 of the second four-way valve, ports 1 and 3 of the second plate heat exchanger, ports 1 and 4 of the first four-way valve 17, and the fourth water pump. The heat exchange medium then flows through the second radiator, where the fan draws in outside air to exchange heat with the radiator, carrying away the heat from the heat exchange medium and lowering its temperature. The low-temperature heat exchange medium then flows through ports 1 and 2 of the second three-way valve, ports 3 and 4 of the LCC heat exchanger, and the PTC water heater, and through ports 3 and 2 of the first four-way valve, into the internal water channel of the power battery. The heat exchange medium exchanges heat with the power battery, causing the temperature of the low-temperature heat exchange medium to rise and the temperature of the power battery to drop. The medium then returns to the first water pump, completing the cycle.

[0040] For vehicle driving modes applied in low-temperature environments, the following control methods are included:

[0041] C1, Cabin heating control method:

[0042] Mode 1: The third water pump is started, and the heat exchange medium enters the air conditioning unit's heating core. The blower draws air into the air conditioning unit, where it is heated by the heating core and then enters the cabin, raising the cabin temperature. The heat exchange medium then flows through ports 3 and 4 of the LCC heat exchanger, the PTC water heater, ports 3 and 4 of the first four-way valve, the fourth water pump, the second radiator, ports 1 and 3 of the second three-way valve, ports 1 and 4 of the third four-way valve, ports 1 and 3 of the first plate heat exchanger, ports 1 and 2 of the second four-way valve, and the second water pump. The heat exchange medium then enters the internal water channel of the motor / electric control system, absorbing the heat generated by the DC / DC module, motor controller, and drive motor. The high-temperature heat exchange medium then returns to the third water pump through ports 1 and 2 of the first three-way valve and ports 3 and 2 of the third four-way valve, completing the cycle.

[0043] Mode 2: The third water pump is started and the heat exchange medium enters the air conditioning unit's heating core. The blower draws air into the air conditioning unit, where it is heated by the heating core and its temperature rises. The heated air then enters the cabin, raising its temperature. The heat exchange medium enters the LCC heat exchanger through ports ③ and ④. The refrigerant condenses and liquefies inside the LCC heat exchanger, releasing heat to heat the low-temperature heat exchange medium. The high-temperature heat exchange medium passes through the PTC water heater, ports ③ and ④ of the first four-way valve, the fourth water pump, the second radiator, ports ① and ③ of the second three-way valve, and ports ① and ② of the third four-way valve, returning to the third water pump to complete the cycle.

[0044] Simultaneously, the electric compressor is started, and the refrigerant passes through the first and second ports of the LCC heat exchanger. The refrigerant exchanges heat with the water circuit inside the LCC heat exchanger, and the refrigerant releases heat and condenses into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve. At this time, the first and third electronic expansion valves are in the closed state. After the refrigerant passes through the second electronic expansion valve for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium inside the first plate heat exchanger and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator and returns to the electric compressor, completing the refrigerant cycle.

[0045] Simultaneously, the second water pump is controlled to be in working state, and the heat exchange medium enters the internal water channel of the motor / electric control, absorbing the heat generated by the DC / DC module, motor controller, and drive motor. The high-temperature heat exchange medium passes through the first three-way valve (ports ① and ②), the third four-way valve (ports ③ and ④), and the first plate heat exchanger (ports ① and ③). The heat exchange medium exchanges heat with the refrigerant inside the first plate heat exchanger. The liquid refrigerant evaporates and absorbs heat to become gaseous, and the temperature of the heat exchange medium decreases. Then, it returns to the second water pump through the first and second ports of the second four-way valve, completing the cycle.

[0046] C2, Battery temperature control method:

[0047] Mode 1: The second water pump is in operation. The heat exchange medium enters the internal water channel of the motor / electric control unit, absorbing the heat generated by the DC / DC module, motor controller, and drive motor. The high-temperature heat exchange medium enters the power battery through the first three-way valve (ports 1 and 2), the third four-way valve (ports 3 and 4), the first plate heat exchanger (ports 1 and 3), the second four-way valve (ports 1 and 4), the second plate heat exchanger (ports 1 and 3), and the first four-way valve (ports 1 and 2). The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, and the power battery temperature increases. Then, it returns to the second water pump through the first water pump and the second four-way valve (ports 3 and 2), completing the cycle.

[0048] Mode 2: The first water pump is turned on. The heat exchange medium passes through the ③ and ④ ports of the second four-way valve, the ① and ③ ports of the second plate heat exchanger, the ① and ④ ports of the first four-way valve, the fourth water pump, the second radiator, the ① and ② ports of the second three-way valve, and enters the ③ and ④ ports of the LCC heat exchanger. At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater (16), the ③ and ② ports of the first four-way valve, and enters the internal water channel of the power battery. It heats the heat exchange medium and exchanges heat with the power battery. The temperature of the heat exchange medium decreases and the temperature of the power battery increases. Then it returns to the first water pump to complete the cycle.

[0049] Simultaneously, the electric compressor starts, and the refrigerant passes through the first and second ports of the LCC heat exchanger. The refrigerant exchanges heat with the water circuit inside the LCC heat exchanger, releasing heat and condensing into liquid. After the pressure sensor identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve. At this time, the first and third electronic expansion valves (4) are in the closed state. After the refrigerant passes through the second electronic expansion valve for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium inside the first plate heat exchanger and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator and returns to the electric compressor, completing the refrigerant cycle.

[0050] Meanwhile, the second water pump is in operation. The heat exchange medium enters the internal water channel of the motor / electric control system, absorbing the heat generated by the DC / DC module, motor controller, and drive motor. The high-temperature heat exchange medium passes through the first three-way valve (ports 1 and 2), the third four-way valve (ports 3 and 4), and the first plate heat exchanger (ports 1 and 3). Inside the first plate heat exchanger, the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into a gaseous state, reducing the temperature of the heat exchange medium. Then, it returns to the second water pump through the first and second ports of the second four-way valve, completing the cycle.

[0051] C3, Cabin and Battery Control Method: The second water pump is controlled to be in operation. The heat exchange medium enters the internal water channel of the motor / electronic control system, absorbing the heat generated by the DC / DC module, motor controller, and drive motor. The high-temperature heat exchange medium enters the air conditioning unit's heating core through ports ① and ② of the first three-way valve, ports ③ and ② of the third four-way valve, and the third water pump. The blower draws air into the air conditioning unit, where it is heated by the heating core and then enters the cabin, raising the cabin temperature. The heat exchange medium then enters the internal water channel of the power battery through ports ③ and ④ of the LCC heat exchanger, the PTC water heater, and ports ③ and ② of the first four-way valve. The heat exchange medium exchanges heat with the power battery, lowering its temperature and raising the power battery temperature. It then returns to the second water pump through the first water pump and ports ③ and ② of the second four-way valve, completing the cycle.

[0052] Thirdly, the present invention discloses a vehicle equipped with the above-mentioned multi-source thermal management system for electric vehicles.

[0053] The beneficial effects of this invention are as follows: This invention provides a multi-source thermal management system, control method, and vehicle for electric vehicles. The refrigerant circulation loop flows through the air conditioning evaporator to cool the cabin; the water circulation loop flows through the air conditioning heater core to heat the cabin; the water circulation loop flows through the power battery to heat or cool the battery; and the water circulation loop flows through the DC / DC module, motor controller, and drive motor to cool the motor / electronic control system. This invention can fully consider the vehicle's operation under various modes, achieving comprehensive utilization and rational distribution of waste heat from the heat pump air conditioning and the vehicle's motor / electronic control system. It provides abundant heat sources, reduces overall vehicle energy consumption, improves component integration and utilization, reduces overall vehicle cost while optimizing overall vehicle thermal management, and has a simple overall structure and high applicability.

[0054] This invention utilizes waste heat from the motor / electronic control system to achieve cabin heating and battery warming, solving the problem of high energy consumption in PTC heaters; it also utilizes heat from the air to achieve heat pump air conditioning, with the heat pump system absorbing heat from the air to heat the cabin and battery, solving the problem of high energy consumption in PTC heaters; furthermore, it utilizes heat generated during battery charging and operation to achieve heat pump air conditioning, absorbing heat from the battery water circuit to heat the cabin and cool the battery, improving energy utilization efficiency; and it further enhances the efficiency of the heat pump air conditioning by utilizing waste heat from the motor / electronic control system. Heat absorption addresses the issue of reduced heat pump system capacity to transfer heat from the air in low-temperature environments; cooling of the power battery during charging is achieved using a motor / electronic control radiator, resolving the issues of frequent start-stop and efficiency reduction of the electric compressor in low-temperature environments, and reducing energy consumption generated by the electric compressor; shared PTC water heater components enable cabin heating and power battery warming in special scenarios; and integrated coupling of the cabin air conditioning system and battery cooling system, with both systems sharing the compressor, condenser, and condenser fan, solves system redundancy issues, reduces material quantity, and optimizes costs. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the principle of the multi-source thermal management system for electric vehicles in this invention;

[0056] Figure 2 This is a schematic diagram of the refrigerant circulation loop in this invention;

[0057] Figure 3 This is a schematic diagram of the water circulation loop in this invention;

[0058] Figure 4 This is a schematic diagram of the cabin cooling principle in the high-temperature environment of the whole vehicle charging / driving / parking scenarios of the present invention;

[0059] Figure 5 This is a schematic diagram of the battery cooling principle in the high-temperature environment of the whole vehicle charging / driving / parking scenarios of the present invention;

[0060] Figure 6 This is a schematic diagram illustrating the cooling principle of the cabin and battery in high-temperature environments for vehicle charging / driving / parking scenarios according to the present invention.

[0061] Figure 7 This is a schematic diagram of the cabin heating mode 1 in the low-temperature vehicle parking mode scenario of the present invention.

[0062] Figure 8 This is a schematic diagram of the cabin heating mode 2 in the low-temperature vehicle parking mode scenario of the present invention.

[0063] Figure 9 This is a schematic diagram of the cabin heating mode 3 in the low-temperature vehicle parking mode scenario of the present invention.

[0064] Figure 10 This is a schematic diagram illustrating the battery heating / cooling principle in the vehicle parking / charging mode scenario under low temperature conditions according to the present invention.

[0065] Figure 11 This is a schematic diagram illustrating the battery heating principle in the vehicle parking / driving mode scenario under low temperature conditions according to the present invention.

[0066] Figure 12 This is a schematic diagram illustrating the cabin and battery heating principle in a low-temperature vehicle parking mode scenario of the present invention.

[0067] Figure 13 This is a schematic diagram of the cabin heating principle in the vehicle driving mode scenario under low temperature conditions according to the present invention.

[0068] Figure 14 This is a schematic diagram of the battery heating principle in the vehicle driving mode scenario under low temperature conditions according to the present invention.

[0069] Figure 15 This is a schematic diagram of the cabin and battery heating principle in a vehicle driving mode scenario under low temperature conditions according to the present invention.

[0070] The attached diagram is labeled as follows: 1-Electric compressor; 2-LCC heat exchanger; 3-Pressure sensor; 4-Third electronic expansion valve; 5-Second plate heat exchanger; 6-Second electronic expansion valve; 7-First plate heat exchanger; 8-First electronic expansion valve; 9-Air conditioner evaporator; 10-Gas-liquid separator; 11-Air conditioner heater core; 12- 13-Air conditioning blower; 14-Third water pump; 15-Second three-way valve; 16-PTC water heater; 17-First four-way valve; 18-Fourth water pump; 19-Second radiator; 20-Second radiator fan; 21-Third four-way valve; 22-Second four-way valve; 23-Second water pump; 24-DC / DC module; 25-Motor controller; 26-Drive motor; 27-First three-way valve; 28-First radiator; 29-First radiator fan; 30-Second expansion tank; 31-First water pump; 32-Power battery; 33-First expansion tank. Detailed Implementation

[0071] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0072] Example 1

[0073] like Figure 1As shown, this invention discloses a multi-source thermal management system for electric vehicles, including a cabin thermal module, a battery thermal module, and a motor / electronic control thermal module. The cabin thermal module includes an air conditioning unit 13, which houses an air conditioning evaporator 9, an air conditioning heater core 11, and an air conditioning blower 12. The battery thermal module includes a power battery 32. The motor / electronic control thermal module includes a DC / DC module 24, a motor controller 25, and a drive motor 26. It also includes a refrigerant circulation loop and a water circulation loop. The refrigerant circulation loop flows through the air conditioning evaporator 9 to cool the cabin. The water circulation loop flows through the air conditioning heater core 11 to heat the cabin. The water circulation loop flows through the internal water channels of the power battery 32 to heat or cool the battery. The water circulation loop flows through the internal water channels of the DC / DC module 24, the motor controller 25, and the drive motor 26 to cool the motor / electronic control system.

[0074] The control method of the multi-source thermal management system for electric vehicles of this invention achieves the following three application scenarios by controlling the operation of the refrigerant circulation loop and the water circulation loop:

[0075] In high-temperature environments, the control methods for vehicle charging / driving / parking scenarios include the following: controlling cabin cooling, controlling battery cooling, controlling simultaneous cooling of cabin and battery, and controlling motor / electronic control system cooling.

[0076] In low-temperature environments, the control methods for vehicle charging / parking scenarios include the following: controlling cabin heating, controlling battery temperature rise, simultaneously heating the cabin and battery, and controlling battery cooling.

[0077] In low-temperature driving scenarios, the control methods include the following: controlling cabin heating, controlling battery heating, and controlling simultaneous heating of the cabin and battery.

[0078] This invention can fully consider the operation of the vehicle in various modes, realize the comprehensive utilization and rational distribution of waste heat from heat pump air conditioning and vehicle motor / electronic control, with abundant heat sources, reduce vehicle energy consumption, improve component integration and utilization, reduce vehicle cost while optimizing vehicle thermal management, and has a simple overall structure and high applicability.

[0079] Example 2

[0080] This embodiment is a further improvement on embodiment 1, such as... Figure 2As shown, the refrigerant circulation loop includes an electric compressor 1. The outlet of the electric compressor 1 passes through the first port ① and the second port ② of the LCC heat exchanger 2 in sequence and then splits into two paths. One path passes through the first electronic expansion valve 8 in sequence and then connects to the inlet of the air conditioner evaporator 9. A pressure sensor 3 is installed at the second port ② of the LCC heat exchanger 2. The other path splits into two branches again. One branch passes through the second electronic expansion valve 6 in sequence and the second port ② and the fourth port ④ of the first plate heat exchanger 7 in sequence. The other branch passes through the third electronic expansion valve 4 in sequence and the second port ② and the fourth port ④ of the second plate heat exchanger 5 in sequence. After the fourth port ④ of the first plate heat exchanger 7 and the fourth port ④ of the second plate heat exchanger 5 merge for the first time, they merge again with the outlet of the air conditioner evaporator 9 and then connect to the inlet of the gas-liquid separator 10. The outlet of the gas-liquid separator 10 is connected to the inlet of the electric compressor 1.

[0081] like Figure 3 As shown, the water circulation loop includes a first four-way valve 17, a second four-way valve 22, and a third four-way valve 21. The outlet of the second expansion tank 30 is connected to the third port ③ of the third four-way valve 21. The fourth port of the third four-way valve 21 passes sequentially through the first port and the fourth port of the first plate heat exchanger 7 and then connects to the first port of the second four-way valve 22. The second port of the third four-way valve 21 connects to the inlet of the third water pump 14. The outlet of the third water pump 14 connects sequentially to the air conditioning heating core 11 and the third port of the LCC heat exchanger 2. The fourth port of the LCC heat exchanger 2 connects sequentially to the PTC water heater 16 and the fourth port of the first four-way valve 17. The second port of the second four-way valve 22 connects to the inlet of the second water pump 23. The outlet of the second water pump 23 passes sequentially through the internal water channels of the DC / DC module 24, the motor controller 25, and the drive motor 26, then through the first port and the third port of the first three-way valve 27 and the first radiator 28, and finally connects to the third port of the third four-way valve 21. A first radiator fan 29 is installed on the radiator 28. The second port of the first three-way valve 27 is connected to the outlet of the first radiator 28. The fourth port of the second four-way valve 22 is connected to the first port of the first four-way valve 17 after passing through the first and third ports of the second plate heat exchanger 5. The second port of the first four-way valve 17 is connected to the inlet of the first water pump 31 after passing through the internal water channel of the power battery 32. The outlet of the first expansion tank 33 is connected to the inlet of the first water pump 31. The outlet of the first water pump 31 is connected to the third port of the second four-way valve 22. The fourth port of the first four-way valve 17 is connected to the inlet of the fourth water pump 18. The outlet of the fourth water pump 18 is connected to the third port of the second three-way valve 15 after passing through the second radiator 19. A second radiator fan 20 is installed on the second radiator 19.

[0082] Example 3

[0083] This embodiment discloses a control method for a multi-source thermal management system for electric vehicles, based on Embodiment 2.

[0084] Figure 4 , Figure 5 and Figure 6 This is a schematic diagram illustrating the principle of vehicle charging / driving / parking scenarios under high-temperature conditions.

[0085] Function 1. Cabin cooling: such as Figure 4 As shown, when the electric compressor 1 starts, the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the first electronic expansion valve 8. At this time, the second electronic expansion valve 6 and the third electronic expansion valve 4 are in the closed state. After the refrigerant passes through the first electronic expansion valve 8 and the pressure is reduced, the liquid refrigerant absorbs heat from the air and evaporates into gas inside the air conditioner evaporator 9. Then, the air conditioner blower 12 sends the low temperature air to the cabin, and the cabin temperature drops. The gaseous refrigerant passes through the gas-liquid separator 10 and returns to the electric compressor 1, completing the refrigerant cycle.

[0086] Simultaneously, the fourth water pump 18 starts, and the heat exchange medium passes through the second radiator 19. The second radiator fan 20 draws in outside air to exchange heat with the second radiator 19, carrying away the heat of the heat exchange medium and lowering its temperature. The low-temperature heat exchange medium passes through ports ① and ② of the second three-way valve 15, and ports ③ and ④ of the LCC heat exchanger. Inside the LCC heat exchanger 2, the low-temperature heat exchange medium exchanges heat with the high-temperature refrigerant, causing the refrigerant to release heat and condense. Then, the heat exchange medium returns to the first water pump 18 through the PTC water heater 16 and ports ③ and ④ of the first four-way valve 17, completing the water circulation. The high-temperature refrigerant is liquefied by the LCC heat exchanger 2, and the liquid refrigerant absorbs heat from the air and vaporizes at the air conditioning evaporator 9, achieving cabin cooling.

[0087] Function 2. Battery cooling: such as Figure 5 As shown, when the electric compressor 1 starts, the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the third electronic expansion valve 4. At this time, the first electronic expansion valve 8 and the second electronic expansion valve 6 are in the closed state. After the refrigerant passes through the third electronic expansion valve 4 and the pressure is reduced, it flows into the second port ② and the fourth port ④ of the second plate heat exchanger 5. The liquid refrigerant absorbs heat from the water circuit and evaporates into gas inside the second plate heat exchanger 5. Then, it passes through the gas-liquid separator 10 and returns to the electric compressor 1 to complete the cycle.

[0088] Simultaneously, the fourth water pump 18 starts, and the heat exchange medium passes through the second radiator 19. The second radiator fan 20 draws in outside air to exchange heat with the second radiator 19, carrying away the heat of the heat exchange medium and lowering its temperature. The low-temperature heat exchange medium passes through the first and second ports of the second three-way valve 15, and the third and fourth ports of the LCC heat exchanger. Inside the LCC heat exchanger 2, the low-temperature heat exchange medium exchanges heat with the high-temperature refrigerant. The refrigerant releases heat and condenses into liquefaction. Then, the heat exchange medium returns to the first water pump 18 through the PTC water heater 16 and the third and fourth ports of the first four-way valve 17, completing the water circulation.

[0089] Simultaneously with the start of the electric compressor 1, the battery circulation loop is activated, and the first water pump 31 begins operation. The heat exchange medium flows through ports ③ and ④ of the second four-way valve 22 into ports ① and ③ of the second plate heat exchanger 5. The refrigerant evaporates and absorbs heat at the second plate heat exchanger 5, absorbing and carrying away heat from the heat exchange medium, thus transforming it into a low-temperature heat exchange medium. This low-temperature heat exchange medium then enters the internal water channel of the power battery 32 through ports ① and ② of the first four-way valve 17, absorbing and carrying away heat from the power battery 32, before returning to the first water pump 31, completing the circulation and achieving battery cooling. The first expansion tank 33 serves to replenish water and vent air from the battery circulation water circuit.

[0090] Function 3. Simultaneous cooling of the cabin and battery: such as Figure 6 As shown, the electric compressor 1 starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the first electronic expansion valve 8 and the third electronic expansion valve 4 respectively. At this time, the second electronic expansion valve 6 is in the closed state. Then the refrigerant runs according to the above-mentioned cabin cooling and battery cooling routes to achieve the simultaneous cooling needs of the cabin and the battery, and achieve the goal of integrated coupling of refrigeration system components and improved energy utilization efficiency.

[0091] The refrigerant in LCC heat exchanger 2 condenses and liquefies, and its heat is carried away by the heat exchange medium and exchanged with the air at the second radiator 19, where the heat is released into the air.

[0092] Function 4. Motor / Electrical Control Cooling: The second water pump 23 starts working, and the heat exchange medium enters the internal water channel of the motor / electrical control unit to absorb the heat generated by the DC / DC module 24, MCU (motor controller) 25, and drive motor 26. Then, the heat exchange medium enters the first radiator 28 through the first three-way valve 27 (ports ① and ③). The first radiator fan 29 starts to draw in outside air and exchange heat with the first radiator 28. The outside air carries away the heat of the heat exchange medium, reducing its temperature. Then, the heat exchange medium returns to the second water pump 23 through the third four-way valve 21 (ports ③ and ④), the first plate heat exchanger 7 (ports ① and ③), and the second four-way valve 22 (ports ① and ②), completing the cycle. The first radiator 28 exchanges heat with the outside air to reduce the temperature of the circulating medium, thereby reducing the temperature of the motor / electrical control components. The second expansion tank 30 serves to replenish water and release air.

[0093] Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 This is a schematic diagram illustrating the principle of the vehicle charging / parking mode scenario under low-temperature conditions according to the present invention.

[0094] Function 5. Cabin heating:

[0095] Mode 1: such as Figure 7 As shown, the third water pump 14 starts working, and the heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13, and the temperature rises after being heated by the heating core 11. Then the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium enters the PTC water heater 16 through the ③ and ④ ports of the LCC heat exchanger 2 to absorb the heat generated by the heater consuming electricity, and the temperature rises again. The high-temperature heat exchange medium returns to the third water pump 14 through the ③ and ④ ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① and ③ ports of the second three-way valve 15, and the ① and ② ports of the third four-way valve 21, completing the cycle. The heat generated by the PTC water heater 16 consuming electricity is exchanged to the cabin to achieve cabin heating.

[0096] Mode 2: such as Figure 8As shown, the third water pump 14 starts working, and the heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13 and the temperature rises after being heated by the heating core 11. Then the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium enters the ③ port and the ④ port of the LCC heat exchanger 2. At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater 16, the ③ port and the ④ port of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① port and the ③ port of the second three-way valve 15, the ① port and the ② port of the third four-way valve 21, and returns to the third water pump 14 to complete the cycle.

[0097] Simultaneously, the electric compressor 1 starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve 6. At this time, the first electronic expansion valve 8 and the third electronic expansion valve 4 are in the closed state. After the refrigerant passes through the second electronic expansion valve 6 and the pressure is reduced, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger 7 and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator 10 and returns to the electric compressor 1, completing the refrigerant cycle.

[0098] Simultaneously, the second water pump 23 starts working, and the heat exchange medium enters the first radiator 28 through the DC / DC module 24, MCU (motor controller) 25, drive motor 26, and ports ① and ③ of the first three-way valve 27. The first radiator fan 29 starts to draw in outside air to exchange heat with the first radiator 28. The outside air heats the heat exchange medium, raising its temperature. Then, the heat exchange medium passes through ports ③ and ④ of the third four-way valve 21...

[0099] In the first plate heat exchanger 7, through ports ① and ③, the heat exchange medium exchanges heat with the liquid refrigerant inside the first plate heat exchanger 7. The refrigerant absorbs heat and evaporates into a gaseous state, lowering the temperature of the heat exchange medium. Then, it returns to the second water pump 23 through ports ① and ② of the second four-way valve 22, completing the circulation. The first radiator 28 absorbs ambient heat through heat exchange with the ambient air, and then, through the first plate heat exchanger 7 and the LCC heat exchanger 2, the heat is transferred to the cabin-side water circuit to achieve cabin heating.

[0100] Mode 3: such as Figure 9As shown, the third water pump 14 starts working, and the heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13 and the temperature rises after being heated by the heating core 11. Then the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium enters the ③ port and the ④ port of the LCC heat exchanger 2. At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater 16, the ③ port and the ④ port of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① port and the ③ port of the second three-way valve 15, the ① port and the ② port of the third four-way valve 21, and returns to the third water pump 14 to complete the cycle.

[0101] Simultaneously, the electric compressor 1 starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the third electronic expansion valve 4. At this time, the first electronic expansion valve 8 and the second electronic expansion valve 6 are in the closed state. After the refrigerant passes through the third electronic expansion valve 4 and the pressure is reduced, the liquid refrigerant absorbs heat from the heat exchange medium in the second plate heat exchanger 5 and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator 10 and returns to the electric compressor 1, completing the refrigerant cycle.

[0102] Simultaneously, the battery circulation loop is activated, and the first water pump 31 starts working. The heat exchange medium flows through ports ③ and ④ of the second four-way valve 22 into ports ① and ③ of the second plate heat exchanger 5. The refrigerant evaporates and absorbs heat at the second plate heat exchanger 5, absorbing and carrying away the heat from the heat exchange medium, thus transforming it into a low-temperature heat exchange medium. Then, the low-temperature heat exchange medium enters the internal water channel of the power battery 32 through ports ① and ② of the first four-way valve 17, absorbing and carrying away the heat from the power battery 32, raising the temperature of the heat exchange medium. It then returns to the first water pump 31, completing the cycle. This invention utilizes the heat generated during battery charging, and then transports the heat to the cabin-side water channel through the second plate heat exchanger 5 and the LCC heat exchanger 2 to achieve cabin heating.

[0103] Function 6. Battery heating:

[0104] Mode 1: such as Figure 10As shown, the first water pump 31 is turned on. The heat exchange medium passes through the third and fourth ports of the second four-way valve 22, the first and third ports of the second plate heat exchanger 5, the first and fourth ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, and the first and second ports of the second three-way valve 15. The heat exchange medium enters the PTC water heater 16 to absorb the heat generated by the heater consuming electricity and its temperature rises. The high-temperature heat exchange medium passes through the third and second ports of the first four-way valve 17 and enters the internal water channel of the power battery 32. The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, and the temperature of the power battery increases. Then it returns to the first water pump 31 to complete the cycle. The heat generated by the PTC water heater 16 consuming electricity is exchanged with the power battery to achieve battery heating.

[0105] Mode 2: such as Figure 11 As shown, the first water pump 31 is turned on. The heat exchange medium passes through the ③ and ④ ports of the second four-way valve 22, the ① and ③ ports of the second plate heat exchanger 5, the ① and ④ ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① and ② ports of the second three-way valve 15, and enters the ③ and ④ ports of the LCC heat exchanger 2. At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater 16, the ③ and ② ports of the first four-way valve 17, and enters the internal water channel of the power battery 32. The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, the power battery temperature increases, and then returns to the first water pump 31 to complete the cycle.

[0106] Simultaneously, the electric compressor 1 starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve 6. At this time, the first electronic expansion valve 8 and the third electronic expansion valve 4 are in the closed state. After the refrigerant passes through the second electronic expansion valve 6 and the pressure is reduced, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger 7 and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator 10 and returns to the electric compressor 1, completing the refrigerant cycle.

[0107] Simultaneously, the second water pump 23 starts working. The heat exchange medium enters the first radiator 28 through the DC / DC module 24, MCU (motor controller) 25, drive motor 26, and ports ① and ③ of the first three-way valve 27. The first radiator fan 29 starts to draw in outside air to exchange heat with the first radiator 28. The outside air heats the heat exchange medium, raising its temperature. Then, the heat exchange medium passes through ports ③ and ④ of the third four-way valve 21 and ports ① and ③ of the first plate heat exchanger 7. Inside the first plate heat exchanger 7, the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into a gaseous state, lowering the temperature of the heat exchange medium. Then, it returns to the second water pump 23 through ports ① and ② of the second four-way valve 22, completing the cycle. The first radiator 28 absorbs ambient heat through heat exchange with the ambient air, and then the heat is transferred to the battery-side water circuit through the first plate heat exchanger 7 and LCC heat exchanger 2, thus raising the battery temperature.

[0108] Function 7. Simultaneous heating of the cabin and battery:

[0109] like Figure 12 As shown, the third water pump 14 starts working, and the heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13, and after being heated by the heating core 11, the temperature rises. Then, the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium enters the PTC water heater 16 through the ③ and ④ ports of the LCC heat exchanger 2 to absorb the heat generated by the heater's power consumption, and the temperature rises again. The high-temperature heat exchange medium enters the PTC water heater 16 through the ③ and ② ports of the first four-way valve 17. The water enters the internal water channel of the power battery 32, where the high-temperature heat exchange medium exchanges heat with the power battery, causing the temperature of the heat exchange medium to decrease and the temperature of the power battery to increase. Then, it flows through the first water pump 31, the third and fourth ports of the second four-way valve 22, the first and third ports of the second plate heat exchanger 5, the first and fourth ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the first and third ports of the second three-way valve 15, and the first and second ports of the third four-way valve 21, returning to the third water pump 14 to complete the cycle. The heat generated by the PTC water heater 16, which consumes electricity, is exchanged with the cabin and battery, achieving simultaneous heating of both.

[0110] Function 8. Battery cooling: See Figure 10As shown, the first water pump 31 is turned on. The heat exchange medium passes through ports ③ and ④ of the second four-way valve 22, ports ① and ③ of the second plate heat exchanger 5, ports ① and ④ of the first four-way valve 17, and the fourth water pump 18. The heat exchange medium then passes through the second radiator 19. The second radiator fan 20 draws in outside air to exchange heat with the second radiator 19, carrying away the heat of the heat exchange medium and lowering its temperature. The low-temperature heat exchange medium passes through ports ① and ② of the second three-way valve 15, ports ③ and ④ of the LCC heat exchanger, and the PTC water heater 16, passing through ports ③ and ② of the first four-way valve 17, and enters the internal water channel of the power battery 32. The heat exchange medium exchanges heat with the power battery, the temperature of the low-temperature heat exchange medium rises, and the temperature of the power battery drops. Then it returns to the first water pump 31, completing the cycle. The second radiator 19 is used to exchange heat with the ambient air, transferring the heat generated by the power battery to the ambient air to cool the battery.

[0111] Figure 13 , Figure 14 and Figure 15 This is a schematic diagram illustrating the principle of the vehicle driving mode scenario under low temperature conditions according to the present invention.

[0112] Function 9. Cabin Heating:

[0113] Mode 1: such as Figure 13 As shown, the third water pump 14 starts working, and the heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13, and after being heated by the heating core 11, the temperature rises. Then, the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium passes through the ③ and ④ ports of the LCC heat exchanger 2, the PTC water heater 16, the ③ and ④ ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① and ③ ports of the second three-way valve 15, and the ① and ③ ports of the third four-way valve 21. The heat exchange medium enters the internal water channel of the motor / electric control unit through the fourth port, the first and third ports of the first plate heat exchanger 7, the first and second ports of the second four-way valve 22, the second water pump 23, and absorbs the heat generated by the DC / DC module 24, the MCU (motor controller) 25, and the drive motor 26. The high-temperature heat exchange medium returns to the third water pump 14 through the first three-way valve 27 and the third four-way valve 21, completing the circulation. The heat generated by the operation of the motor / electric control unit is introduced into the cabin to achieve cabin heating.

[0114] Mode 2: such as Figure 13As shown, the third water pump 14 starts working, and the heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13 and the temperature rises after being heated by the heating core 11. Then the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium enters the LCC heat exchanger through the ③ and ④ ports of the LCC heat exchanger 2. The refrigerant condenses and liquefies inside the LCC heat exchanger, releasing heat to heat the low-temperature heat exchange medium. The high-temperature heat exchange medium returns to the third water pump 14 through the PTC water heater 16, the ③ and ④ ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① and ③ ports of the second three-way valve 15, and the ① and ② ports of the third four-way valve 21, completing the cycle.

[0115] Simultaneously, the electric compressor 1 starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve 6. At this time, the first electronic expansion valve 8 and the third electronic expansion valve 4 are in the closed state. After the refrigerant passes through the second electronic expansion valve 6 and the pressure is reduced, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger 7 and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator 10 and returns to the electric compressor 1, completing the refrigerant cycle.

[0116] Simultaneously, the second water pump 23 is in operation, and the heat exchange medium enters the internal water channel of the motor / electrical control unit, absorbing the heat generated by the DC / DC module 24, MCU (motor controller) 25, and drive motor 26. The high-temperature heat exchange medium passes through the first three-way valve 27 (ports ① and ②), the third four-way valve 21 (ports ③ and ④), and the first plate heat exchanger 7 (ports ① and ③). Inside the first plate heat exchanger 7, the heat exchange medium exchanges heat with the refrigerant. The liquid refrigerant evaporates, absorbs heat, and becomes gaseous, lowering the temperature of the heat exchange medium. Then, it returns to the second water pump 23 through the second four-way valve 22 (ports ① and ②), completing the cycle. This invention utilizes the heat generated by the motor / electrical control unit through refrigerant vaporization in the first plate heat exchanger 7 and the heat released by refrigerant liquefaction in the LCC heat exchanger to exchange heat with the cabin, achieving cabin heating.

[0117] Function 10. Battery Heating:

[0118] Mode 1: such as Figure 14As shown, the second water pump 23 is in operation. The heat exchange medium enters the internal water channel of the motor / electronic control unit, absorbing the heat generated by the DC / DC module 24, MCU (motor controller) 25, and drive motor 26. The high-temperature heat exchange medium enters the power battery 32 through ports ① and ② of the first three-way valve 27, ports ③ and ④ of the third four-way valve 21, ports ① and ③ of the first plate heat exchanger 7, ports ① and ④ of the second four-way valve 22, ports ① and ③ of the second plate heat exchanger 5, and ports ① and ② of the first four-way valve 17. The high-temperature heat exchange medium exchanges heat with the power battery, causing the temperature of the heat exchange medium to decrease and the temperature of the power battery to increase. Then, it returns to the second water pump 23 through the first water pump 31 and ports ③ and ② of the second four-way valve 22, completing the cycle. The heat generated by the motor / electronic control unit is introduced into the battery to raise its temperature.

[0119] Mode 2: such as Figure 14 As shown, the first water pump 31 is turned on. The heat exchange medium passes through the ③ and ④ ports of the second four-way valve 22, the ① and ③ ports of the second plate heat exchanger 5, the ① and ④ ports of the first four-way valve 17, the fourth water pump 18, the second radiator 19, the ① and ② ports of the second three-way valve 15, and enters the ③ and ④ ports of the LCC heat exchanger 2. At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater 16, the ③ and ② ports of the first four-way valve 17, and enters the internal water channel of the power battery 32. It heats the heat exchange medium and exchanges heat with the power battery. The temperature of the heat exchange medium decreases and the temperature of the power battery increases. Then it returns to the first water pump 31 to complete the cycle.

[0120] Simultaneously, the electric compressor 1 starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger 2. The refrigerant exchanges heat with the water circuit in the LCC heat exchanger 2, and the refrigerant releases heat and condenses into liquid. After the pressure sensor 3 identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve 6. At this time, the first electronic expansion valve 8 and the third electronic expansion valve 4 are in the closed state. After the refrigerant passes through the second electronic expansion valve 6 and the pressure is reduced, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger 7 and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator 10 and returns to the electric compressor 1, completing the refrigerant cycle.

[0121] Simultaneously, the second water pump 23 is in operation, and the heat exchange medium enters the internal water channel of the motor / electronic control unit, absorbing the heat generated by the DC / DC module 24, MCU (motor controller) 25, and drive motor 26. The high-temperature heat exchange medium passes through ports ① and ② of the first three-way valve 27, ports ③ and ④ of the third four-way valve 21, and ports ① and ③ of the first plate heat exchanger 7. Inside the first plate heat exchanger 7, the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into a gaseous state, lowering the temperature of the heat exchange medium. Then, it returns to the second water pump 23 through ports ① and ② of the second four-way valve 22, completing the cycle. The heat generated by the operation of the motor / electronic control unit and the compressor is transported to the battery-side water channel through the first plate heat exchanger 7 and LCC heat exchanger 2, thereby raising the battery temperature.

[0122] Function 11. Simultaneous heating of the cabin and battery: such as Figure 15 As shown, the second water pump 23 is in operation. The heat exchange medium enters the internal water channel of the motor / electric control unit, absorbing the heat generated by the DC / DC module 24, MCU (motor controller) 25, and drive motor 26. The high-temperature heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13 through the first three-way valve 27 (ports ① and ②), the third four-way valve 21 (ports ③ and ②), and the third water pump 14. The high-temperature heat exchange medium enters the air conditioning heating core 11 of the air conditioning unit 13. The blower 12 draws air into the air conditioning unit 13, and the temperature rises after being heated by the heating core 11. Then the heated air enters the cabin, raising the cabin temperature. The heat exchange medium enters the internal water channel of the power battery 32 through the third and fourth ports of the LCC heat exchanger 2, the PTC water heater 16, and the third and second ports of the first four-way valve 17. The heat exchange medium exchanges heat with the power battery, lowering the temperature of the heat exchange medium and raising the temperature of the power battery. Then it returns to the second water pump 23 through the first water pump 31 and the third and second ports of the second four-way valve 22, completing the cycle. The heat generated by the motor / electronic control system is introduced into the cabin and battery to raise the temperature of the cabin and battery.

[0123] Example 4

[0124] This embodiment discloses a vehicle equipped with the electric vehicle multi-source thermal management system of Embodiment 1 or Embodiment 2.

[0125] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A multi-source thermal management system for electric vehicles, characterized in that: The system includes a cabin heating module, a battery heating module, and a motor / electronic control heating module. The cabin heating module includes an air conditioning unit (13), which houses an air conditioning evaporator (9), an air conditioning heater core (11), and an air conditioning blower (12). The battery heating module includes a power battery (32). The motor / electronic control heating module includes a DC / DC module (24), a motor controller (25), and a drive motor (26). The system also includes a refrigerant circulation loop and a water circulation loop. The refrigerant circulation loop flows through the air conditioning evaporator (9) to cool the cabin. The water circulation loop flows through the air conditioning heater core (11). To achieve cabin heating, the water circulation loop flows through the internal water channel of the power battery (32) to achieve battery heating or cooling. The water circulation loop flows through the internal water channels of the DC / DC module (24), motor controller (25), and drive motor (26) to achieve motor / electric control cooling. The refrigerant circulation loop includes an electric compressor (1). The outlet of the electric compressor (1) passes through the first port ① and the second port ② of the LCC heat exchanger (2) in sequence and then splits into two paths. One path passes through the first electronic expansion valve (8) in sequence and then connects to the inlet of the air conditioning evaporator (9). The second port of the LCC heat exchanger (2) is set with With a pressure sensor (3), the other path splits into two branches. One branch passes through the second electronic expansion valve (6) and the second and fourth ports of the first plate heat exchanger (7) in sequence. The other branch passes through the third electronic expansion valve (4) and the second and fourth ports of the second plate heat exchanger (5) in sequence. After the fourth port of the first plate heat exchanger (7) and the fourth port of the second plate heat exchanger (5) merge for the first time, they merge again with the outlet of the air conditioning evaporator (9) and then connect to the inlet of the gas-liquid separator (10). The outlet of the gas-liquid separator (10) is connected to the inlet of the electric compressor (1). The water circulation loop includes The system includes a first four-way valve (17), a second four-way valve (22), and a third four-way valve (21). The fourth port of the third four-way valve (21) passes through the first port and the fourth port of the first plate heat exchanger (7) and then connects to the first port of the second four-way valve (22). The second port of the third four-way valve (21) is connected to the inlet of the third water pump (14). The outlet of the third water pump (14) is connected to the air conditioning heating core (11) and the third port of the LCC heat exchanger (2) in sequence. The fourth port of the LCC heat exchanger (2) is connected to the PTC water heater (16) and the fourth port of the first four-way valve (17) in sequence.The second port of the second four-way valve (22) is connected to the inlet of the second water pump (23). The outlet of the second water pump (23) passes through the internal water channels of the DC / DC module (24), the motor controller (25) and the drive motor (26), the first port and the third port of the first three-way valve (27) and the first radiator (28) and then connects to the third port of the third four-way valve (21). The first radiator (28) is equipped with a first radiator fan (29). The second port of the first three-way valve (27) is connected to the outlet of the first radiator (28). The fourth port of the second four-way valve (22) passes through the second plate. The first and third ports of the heat exchanger (5) are connected to the first port of the first four-way valve (17); the second port of the first four-way valve (17) passes through the internal water channel of the power battery (32) and is connected to the inlet of the first water pump (31), and the outlet of the first water pump (31) is connected to the third port of the second four-way valve (22); the fourth port of the first four-way valve (17) is connected to the inlet of the fourth water pump (18), and the outlet of the fourth water pump (18) passes through the second radiator (19) and is connected to the third port of the second three-way valve (15), and the second radiator (19) is equipped with a second radiator fan (20).

2. The multi-source thermal management system for electric vehicles according to claim 1, characterized in that: It includes a first expansion tank (33), the outlet of which is connected to the inlet of the first water pump (31).

3. The multi-source thermal management system for electric vehicles according to claim 1, characterized in that: It includes a second expansion tank (30), the outlet of which is connected to the third port of the third four-way valve (21).

4. A control method for a multi-source thermal management system for electric vehicles as described in claim 1, characterized in that: include: In high-temperature environments, the control method for vehicle charging / driving / parking scenarios includes the following control modes: controlling cabin cooling, controlling battery cooling, controlling simultaneous cooling of cabin and battery, and controlling motor / electronic control system cooling. In low-temperature environments, the control method for vehicle charging / parking scenarios includes the following control modes: controlling cabin heating, controlling battery heating, simultaneously heating the cabin and battery, and controlling battery cooling. In low-temperature vehicle driving scenarios, the control method includes the following control modes: controlling cabin heating, controlling battery heating, and controlling simultaneous heating of the cabin and battery.

5. A control method for a multi-source thermal management system for electric vehicles as described in claim 1, characterized in that: Applications include vehicle charging / driving / parking scenarios in high-temperature environments, including the following control methods: A1, Cabin cooling control method: The electric compressor (1) is started, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2), and the refrigerant releases heat and condenses and liquefies. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the first electronic expansion valve (8). At this time, the second electronic expansion valve (6) and the third electronic expansion valve (4) are closed. After the refrigerant passes through the first electronic expansion valve (8) for throttling and pressure reduction, the liquid refrigerant absorbs heat from the air and evaporates into gas in the air conditioning evaporator (9). Then, the air conditioning blower (12) sends the low temperature air to the cabin, and the cabin temperature decreases. The gaseous refrigerant passes through the gas-liquid separator (10) and returns to the electric compressor (1) to complete the refrigerant cycle. At the same time, the fourth water pump (18) is started, and the heat exchange medium passes through the second radiator (19). The second radiator fan (20) draws in outside air and exchanges heat with the second radiator (19), taking away the heat of the heat exchange medium and reducing the temperature of the heat exchange medium. The low-temperature heat exchange medium passes through the first and second ports of the second three-way valve (15), and the third and fourth ports of the LCC heat exchanger (2). Inside the LCC heat exchanger (2), the low-temperature heat exchange medium exchanges heat with the high-temperature refrigerant. The refrigerant releases heat and condenses and liquefies. Then the heat exchange medium returns to the first water pump (31) through the PTC water heater (16) and the third and second ports of the first four-way valve (17), completing the water circulation. A2, Battery cooling control method: Control the start of electric compressor (1), the refrigerant passes through the first port ① and the second port of LCC heat exchanger (2), the refrigerant exchanges heat with the water circuit in LCC heat exchanger (2), the refrigerant releases heat and condenses and liquefies, after the pressure sensor (3) identifies the pressure value as normal, the liquid refrigerant flows to the third electronic expansion valve (4), at this time, the first electronic expansion valve (8) and the second electronic expansion valve (6) are in the closed state, after the refrigerant passes through the third electronic expansion valve (4) for throttling and pressure reduction, it flows into the second port ② and the fourth port of the second plate heat exchanger (5), the liquid refrigerant absorbs heat in the water circuit and evaporates into gas in the second plate heat exchanger (5), and then returns to the electric compressor (1) through the gas-liquid separator (10) to complete the cycle; At the same time, the fourth water pump (18) is started, and the heat exchange medium passes through the second radiator (19). The second radiator fan (20) draws in outside air and exchanges heat with the second radiator (19), taking away the heat of the heat exchange medium and reducing the temperature of the heat exchange medium. The low-temperature heat exchange medium passes through the first and second ports of the second three-way valve (15), and the third and fourth ports of the LCC heat exchanger (2). Inside the LCC heat exchanger (2), the low-temperature heat exchange medium exchanges heat with the high-temperature refrigerant. The refrigerant releases heat and condenses and liquefies. Then the heat exchange medium returns to the first water pump (31) through the PTC water heater (16) and the third and fourth ports of the first four-way valve (17), completing the water circulation. While controlling the electric compressor (1) to start, the battery circulation loop starts and controls the first water pump (31) to start working. The heat exchange medium flows into the first and third ports of the second plate heat exchanger (5) through the third and fourth ports of the second four-way valve (22). The refrigerant evaporates and absorbs heat at the second plate heat exchanger (5), absorbing and carrying away the heat in the heat exchange medium. The heat exchange medium becomes a low-temperature heat exchange medium. Then, the low-temperature heat exchange medium enters the internal water channel of the power battery (32) through the first four-way valve (17) through the first and second ports, absorbing and carrying away the heat of the power battery (32), and then returns to the first water pump (31) to complete the cycle and achieve battery cooling. A3, Simultaneous cooling control method for cabin and battery: The electric compressor (1) is started, and the refrigerant passes through the first port and the second port of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2), and the refrigerant releases heat and condenses and liquefies. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the first electronic expansion valve (8) and the third electronic expansion valve (4) respectively. At this time, the second electronic expansion valve (6) is in the closed state. Then the refrigerant runs according to the cabin cooling and battery cooling routes respectively to achieve the simultaneous cooling requirements of cabin and battery. A4, Motor / Electrical Control Cooling Control Method: The second water pump (23) is started and the heat exchange medium enters the internal water channel of the motor / electric control to absorb the heat generated by the DC / DC module (24), motor controller (25), and drive motor (26). Then, the heat exchange medium enters the first radiator (28) through the first three-way valve (27) through the first port ① and the third port ③. The first radiator fan (29) starts to draw in outside air and exchange heat with the first radiator (28). The outside air carries away the heat of the heat exchange medium and lowers the temperature of the heat exchange medium. Then, the heat exchange medium returns to the second water pump (23) through the third four-way valve (21) through the third port ③ and the fourth port ④, the first plate heat exchanger (7) through the first port ① and the third port ③, and the second four-way valve (22) through the first port ① and the second port ②, completing the cycle.

6. A control method for a multi-source thermal management system for electric vehicles as described in claim 1, characterized in that: For vehicle charging / parking modes in low-temperature environments, the following control methods are included: B1, Cabin heating control method: Mode 1: Control the third water pump (14) to start working, the heat exchange medium enters the air conditioning heating core (11) of the air conditioning box (13), the blower (12) draws the air into the air conditioning box (13), and the temperature rises after being heated by the heating core (11). Then the heated air enters the cabin, the cabin temperature rises, the heat exchange medium enters the PTC water heater (16) through the ③ and ④ ports of the LCC heat exchanger (2) to absorb the heat generated by the heater consuming electricity and the temperature rises again. The high temperature heat exchange medium returns to the third water pump (14) through the ③ and ④ ports of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the ① and ③ ports of the second three-way valve (15), the ① and ② ports of the third four-way valve (21), and completes the cycle. Mode 2: Control the third water pump (14) to start working, the heat exchange medium enters the air conditioning heating core (11) of the air conditioning box (13), the blower (12) draws the air into the air conditioning box (13), and the temperature rises after being heated by the heating core (11). Then the heated air enters the cabin, the cabin temperature rises, the heat exchange medium enters the ③ port and the ④ port of the LCC heat exchanger (2), at this time the heat generated by the condensation and liquefaction of the high temperature refrigerant here heats the heat exchange medium into a high temperature heat exchange medium. The high temperature medium passes through the PTC water heater (16), the ③ port and the ④ port of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the ① port and the ③ port of the second three-way valve (15), the ① port and the ② port of the third four-way valve (21), and returns to the third water pump (14) to complete the cycle; At the same time, the electric compressor (1) is started. The refrigerant passes through the first port and the second port of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2). The refrigerant releases heat and condenses into liquid. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve (6). At this time, the first electronic expansion valve (8) and the third electronic expansion valve (4) are closed. After the refrigerant passes through the second electronic expansion valve (6) for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger (7) and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator (10) and returns to the electric compressor (1) to complete the refrigerant cycle. At the same time, the second water pump (23) is started and the heat exchange medium enters the first radiator (28) through the DC / DC module (24), motor controller (25), drive motor (26), and the first three-way valve (27) through the first port ① and the third port ③. The first radiator fan (29) starts to draw in outside air and exchange heat with the first radiator (28). The outside air heats the heat exchange medium and raises the temperature of the heat exchange medium. Then the heat exchange medium passes through the third four-way valve (21) through the third port ③ and the fourth port ④, and the first plate heat exchanger (7) through the first port ① and the third port ③. Inside the first plate heat exchanger (7), the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into gas, and the temperature of the heat exchange medium decreases. Then it passes through the first port ① and the second port ② of the second four-way valve (22) and returns to the second water pump (23) to complete the cycle. Mode 3: Control the third water pump (14) to start working, the heat exchange medium enters the air conditioning heating core (11) of the air conditioning box (13), the blower (12) draws the air into the air conditioning box (13), and the temperature rises after being heated by the heating core (11). Then the heated air enters the cabin, the cabin temperature rises, the heat exchange medium enters the ③ port and the ④ port of the LCC heat exchanger (2), at this time the heat generated by the condensation and liquefaction of the high temperature refrigerant here heats the heat exchange medium into a high temperature heat exchange medium. The high temperature medium passes through the PTC water heater (16), the ③ port and the ④ port of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the ① port and the ③ port of the second three-way valve (15), the ① port and the ② port of the third four-way valve (21), and returns to the third water pump (14) to complete the cycle; At the same time, the electric compressor (1) is started. The refrigerant passes through the first port and the second port of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2). The refrigerant releases heat and condenses into liquid. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the third electronic expansion valve (4). At this time, the first electronic expansion valve (8) and the second electronic expansion valve (6) are closed. After the refrigerant passes through the third electronic expansion valve (4) for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the second plate heat exchanger (5) and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator (10) and returns to the electric compressor (1) to complete the refrigerant cycle. At the same time, the battery circulation loop is started, controlling the first water pump (31) to start working. The heat exchange medium flows into the first and third ports of the second plate heat exchanger (5) through the third and fourth ports of the second four-way valve (22). The refrigerant evaporates and absorbs heat at the second plate heat exchanger (5), absorbing and carrying away the heat in the heat exchange medium. The heat exchange medium becomes a low-temperature heat exchange medium. Then, the low-temperature heat exchange medium enters the internal water channel of the power battery (32) through the first four-way valve (17) through the first and second ports, absorbing and carrying away the heat of the power battery (32). The temperature of the heat exchange medium rises, and then returns to the first water pump (31) to complete the cycle. B2, Battery temperature control method: Mode 1: Control the first water pump (31) to start working. The heat exchange medium enters the PTC water heater (16) through the ③ and ④ ports of the second four-way valve (22), the ① and ③ ports of the second plate heat exchanger (5), the ① and ④ ports of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the ① and ② ports of the second three-way valve (15), and absorbs the heat generated by the heater consuming electricity to increase its temperature. The high-temperature heat exchange medium enters the internal water channel of the power battery (32) through the ③ and ② ports of the first four-way valve (17). The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, the temperature of the power battery increases, and then returns to the first water pump (31) to complete the cycle. The heat generated by the PTC water heater (16) consuming electricity is exchanged with the power battery to achieve battery heating. Mode 2: The first water pump (31) is turned on and the heat exchange medium passes through the ③ and ④ ports of the second four-way valve (22), the ① and ③ ports of the second plate heat exchanger (5), the ① and ④ ports of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the ① and ② ports of the second three-way valve (15), and the ③ and ④ ports of the LCC heat exchanger (2). At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater (16), the ③ and ② ports of the first four-way valve (17), and enters the internal water channel of the power battery (32). The high-temperature heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, the temperature of the power battery increases, and then returns to the first water pump (31) to complete the cycle. At the same time, the electric compressor (1) is started. The refrigerant passes through the first port and the second port of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2). The refrigerant releases heat and condenses into liquid. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve (6). At this time, the first electronic expansion valve (8) and the third electronic expansion valve (4) are closed. After the refrigerant passes through the second electronic expansion valve (6) for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger (7) and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator (10) and returns to the electric compressor (1) to complete the refrigerant cycle. At the same time, the second water pump (23) is started and the heat exchange medium enters the first radiator (28) through the DC / DC module (24), motor controller (25), drive motor (26), and the first three-way valve (27) through the first port ① and the third port ③. The first radiator fan (29) starts to draw in outside air and exchange heat with the first radiator (28). The outside air heats the heat exchange medium and raises the temperature of the heat exchange medium. Then the heat exchange medium passes through the third four-way valve (21) through the third port ③ and the fourth port ④, and the first plate heat exchanger (7) through the first port ① and the third port ③. Inside the first plate heat exchanger (7), the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into gas, and the temperature of the heat exchange medium decreases. Then it passes through the first port ① and the second port ② of the second four-way valve (22) and returns to the second water pump (23) to complete the cycle. B3, simultaneous cabin and battery temperature control method: The third water pump (14) is started, and the heat exchange medium enters the air conditioning heating core (11) of the air conditioning unit (13). The blower (12) draws air into the air conditioning unit (13), and the temperature rises after being heated by the heating core (11). Then the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium enters the PTC water heater (16) through the ③ and ④ ports of the LCC heat exchanger (2) to absorb the heat generated by the heater's power consumption and operation, and the temperature rises again. The high-temperature heat exchange medium enters the power supply through the ③ and ② ports of the first four-way valve (17). The internal water channel of the battery (32) allows the high-temperature heat exchange medium to exchange heat with the power battery. The temperature of the heat exchange medium decreases, while the temperature of the power battery increases. Then, the heat exchange medium flows through the first water pump (31), the third and fourth ports of the second four-way valve (22), the first and third ports of the second plate heat exchanger (5), the first and fourth ports of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the first and third ports of the second three-way valve (15), and the first and second ports of the third four-way valve (21), before returning to the third water pump (14) to complete the cycle. B4, Battery cooling control method: The first water pump (31) is turned on. The heat exchange medium passes through the third and fourth ports of the second four-way valve (22), the first and third ports of the second plate heat exchanger (5), the first and fourth ports of the first four-way valve (17), and the fourth water pump (18). The heat exchange medium passes through the second radiator (19). The second radiator fan (20) draws in outside air and exchanges heat with the second radiator (19), taking away the heat of the heat exchange medium and lowering the temperature of the heat exchange medium. The low-temperature heat exchange medium passes through the first and second ports of the second three-way valve (15), the third and fourth ports of the LCC heat exchanger (2), and the PTC water heater (16). It passes through the third and second ports of the first four-way valve (17) and enters the internal water channel of the power battery (32). The heat exchange medium exchanges heat with the power battery. The temperature of the low-temperature heat exchange medium rises and the temperature of the power battery drops. Then it returns to the first water pump (31) to complete the cycle.

7. A control method for a multi-source thermal management system for electric vehicles as described in claim 1, characterized in that: For vehicle driving modes applied in low-temperature environments, the following control methods are included: C1, Cabin heating control method: Mode 1: The third water pump (14) is started and the heat exchange medium enters the air conditioning heating core (11) of the air conditioning unit (13). The blower (12) draws air into the air conditioning unit (13), and the temperature rises after being heated by the heating core (11). Then the heated air enters the cabin, and the cabin temperature rises. The heat exchange medium passes through the ③ and ④ ports of the LCC heat exchanger (2), the PTC water heater (16), the ③ and ④ ports of the first four-way valve (17), the fourth water pump (18), the second radiator (19), and the ① port of the second three-way valve (15). The heat exchange medium enters the internal water channel of the motor / electric control unit through the ③ port, the ① and ④ ports of the third four-way valve (21), the ① and ③ ports of the first plate heat exchanger (7), the ① and ② ports of the second four-way valve (22), the second water pump (23), and absorbs the heat generated by the DC / DC module (24), the motor controller (25), and the drive motor (26). The high-temperature heat exchange medium returns to the third water pump (14) through the ① and ② ports of the first three-way valve (27) and the ③ and ② ports of the third four-way valve (21) to complete the circulation. Mode 2: Control the third water pump (14) to start working, the heat exchange medium enters the air conditioning heating core (11) of the air conditioning box (13), the blower (12) draws the air into the air conditioning box (13), the temperature rises after being heated by the heating core (11), and then the heated air enters the cabin, the cabin temperature rises, the heat exchange medium enters the LCC heat exchanger (2) through the ③ and ④ ports of the LCC heat exchanger (2), the refrigerant condenses and liquefies inside the LCC heat exchanger (2), releases heat to heat the low temperature heat exchange medium, the high temperature heat exchange medium returns to the third water pump (14) through the PTC water heater (16), the ③ and ④ ports of the first four-way valve (17), the fourth water pump (18), the second radiator (19), the ① and ③ ports of the second three-way valve (15), the ① and ② ports of the third four-way valve (21), and completes the cycle; At the same time, the electric compressor (1) is started. The refrigerant passes through the first port and the second port of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2). The refrigerant releases heat and condenses into liquid. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve (6). At this time, the first electronic expansion valve (8) and the third electronic expansion valve (4) are closed. After the refrigerant passes through the second electronic expansion valve (6) for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger (7) and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator (10) and returns to the electric compressor (1) to complete the refrigerant cycle. At the same time, the second water pump (23) is in working condition, and the heat exchange medium enters the internal water channel of the motor / electric control to absorb the heat generated by the DC / DC module (24), motor controller (25), and drive motor (26). The high-temperature heat exchange medium passes through the first three-way valve (27) at port ① and port ②, the third four-way valve (21) at port ③ and port ④, and the first plate heat exchanger (7) at port ① and port ③. The heat exchange medium exchanges heat with the refrigerant inside the first plate heat exchanger (7). The liquid refrigerant evaporates and absorbs heat to become gaseous, and the temperature of the heat exchange medium decreases. Then, it passes through the first four-way valve (22) at port ① and port ② and returns to the second water pump (23) to complete the cycle. C2, Battery temperature control method: Mode 1: The second water pump (23) is in working condition. The heat exchange medium enters the internal water channel of the motor / electric control to absorb the heat generated by the DC / DC module (24), motor controller (25), and drive motor (26). The high-temperature heat exchange medium enters the power battery (32) through the first three-way valve (27) ① and ②, the third four-way valve (21) ③ and ④, the first plate heat exchanger (7) ① and ③, the second four-way valve (22) ① and ④, the second plate heat exchanger (5) ① and ③, and the first four-way valve (17). The heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, and the temperature of the power battery increases. Then it returns to the second water pump (23) through the first water pump (31) and the second four-way valve (22) ③ and ② to complete the cycle. Mode 2: Control the first water pump (31) to start working. The heat exchange medium passes through the ③ and ④ ports of the second four-way valve (22), the ① and ③ ports of the second plate heat exchanger (5), the ① and ④ ports of the first four-way valve (17), the ① and ② ports of the fourth water pump (18), the second radiator (19), and the ① and ② ports of the second three-way valve (15). The heat exchange medium enters the ③ and ④ ports of the LCC heat exchanger (2). At this time, the heat generated by the condensation and liquefaction of the high-temperature refrigerant here heats the heat exchange medium into a high-temperature heat exchange medium. The high-temperature medium passes through the PTC water heater (16) and the ③ and ② ports of the first four-way valve (17) and enters the internal water channel of the power battery (32). The heat exchange medium is heated and exchanges heat with the power battery. The temperature of the heat exchange medium decreases and the temperature of the power battery increases. Then it returns to the first water pump (31) to complete the cycle. At the same time, the electric compressor (1) starts, and the refrigerant passes through the first port ① and the second port ② of the LCC heat exchanger (2). The refrigerant exchanges heat with the water circuit in the LCC heat exchanger (2), and the refrigerant releases heat and condenses and liquefies. After the pressure sensor (3) identifies that the pressure value is normal, the liquid refrigerant flows to the second electronic expansion valve (6). At this time, the first electronic expansion valve (8) and the third electronic expansion valve (4) are in the closed state. After the refrigerant passes through the second electronic expansion valve (6) for throttling and pressure reduction, the liquid refrigerant absorbs heat from the heat exchange medium in the first plate heat exchanger (7) and evaporates into gas. The gaseous refrigerant passes through the gas-liquid separator (10) and returns to the electric compressor (1) to complete the refrigerant cycle. Meanwhile, the second water pump (23) is in operation, and the heat exchange medium enters the internal water channel of the motor / electric control to absorb the heat generated by the DC / DC module (24), the motor controller (25), and the drive motor (26). The high-temperature heat exchange medium passes through the first three-way valve (27) at port ① and port ②, the third four-way valve (21) at port ③ and port ④, and the first plate heat exchanger (7) at port ① and port ③. Inside the first plate heat exchanger (7), the heat exchange medium exchanges heat with the liquid refrigerant. The refrigerant absorbs heat and evaporates into gas, and the temperature of the heat exchange medium decreases. Then, it passes through the first four-way valve (22) at port ① and port ② and returns to the second water pump (23) to complete the cycle. C3, Cabin and Battery Control Method: The second water pump (23) is controlled to be in working state. The heat exchange medium enters the internal water channel of the motor / electric control system to absorb the heat generated by the DC / DC module (24), motor controller (25), and drive motor (26). The high-temperature heat exchange medium enters the air conditioning heating core (11) of the air conditioning unit (13) through the first three-way valve (27), the third four-way valve (21), the third water pump (14), and the blower (12) draws air into the air conditioning unit (13). After the heating core (11) is heated, the temperature rises, and then the heated air enters the cabin, the cabin temperature rises, and the heat exchange medium enters the internal water channel of the power battery (32) through the ③ and ④ ports of the LCC heat exchanger (2), the PTC water heater (16), the ③ and ② ports of the first four-way valve (17), the high temperature heat exchange medium enters the internal water channel of the power battery (32), the heat exchange medium exchanges heat with the power battery, the temperature of the heat exchange medium decreases, the temperature of the power battery increases, and then returns to the second water pump (23) through the first water pump (31), the ③ and ② ports of the second four-way valve (22), and the cycle is completed.

8. A vehicle, characterized in that: The electric vehicle is equipped with the multi-source thermal management system according to any one of claims 1 to 3.

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