Electric vehicle thermal management system

Abstract

The electric vehicle thermal management system provided by the application comprises: a first throttling device and a compressor, a high-pressure water heating PTC, a three-way valve and a power battery pack connected in parallel; a front-end cooling unit comprises an evaporative condenser; a refrigerant-side integrated unit comprises a water-cooled condenser, a five-way valve, a second throttling device, a third throttling device, a fourth throttling device and a battery cooler connected through pipelines; a cooling liquid-side integrated unit comprises a first electronic water pump, a second electronic water pump, a third electronic water pump, a four-way valve and a seven-way valve connected through pipelines; and a controller, which switches the electric vehicle between a refrigeration mode, a dehumidification mode, an air source heat pump mode, a water source heat pump mode and a triangular cycle heating mode by controlling the communication states of the five-way valve, the four-way valve and the seven-way valve. The application reduces the thermal management cost and weight of the whole vehicle, improves the use frequency of the compressor at extremely low temperature, and reduces resource waste.

Description

Technical Field

[0001] This invention belongs to the field of vehicle thermal management technology and relates to a thermal management system for electric vehicles. Background Technology

[0002] Currently, when the ambient temperature of an electric vehicle's R134a heat pump system drops below -10°C, the reduced pressure leads to excessively low compressor suction density, resulting in decreased system efficiency and a worse coefficient of performance (COP). Below -15°C, traditional R134a heat pump systems struggle to effectively absorb heat from the outside environment, causing the COP to fall below 1 and significantly reducing heating capacity. The heating capacity of these systems becomes insufficient to meet the heating needs of the passenger compartment and battery, necessitating the use of other heating methods, commonly high-power water heaters or PTC heaters. This results in high overall vehicle thermal management costs and weight. Furthermore, using non-heat pump methods for vehicle heating leads to infrequent compressor usage at extremely low temperatures, potentially wasting resources. Summary of the Invention

[0003] This application provides a thermal management system for electric vehicles to solve the problems existing in the prior art, reduce the thermal management cost and weight of the whole vehicle, increase the frequency of compressor use at extremely low temperatures, and reduce resource waste.

[0004] The electric vehicle thermal management system provided in this application includes: a first throttling device and compressor connected in parallel, a high-pressure water heater PTC, a three-way valve and a power battery pack; a front-end cooling unit including an evaporative condenser; a refrigerant-side integrated unit (20) including a water-cooled condenser, a five-way valve, a second throttling device, a third throttling device, a fourth throttling device and a battery cooler connected by pipelines; a coolant-side integrated unit including a first electronic water pump, a second electronic water pump, a third electronic water pump, a four-way valve and a seven-way valve connected by pipelines; an HVAC assembly including an evaporator and a water heating core; and a controller that controls the connection state of the five-way valve, the four-way valve and the seven-way valve to enable the electric vehicle to switch between cooling mode, dehumidification mode, air source heat pump mode, water source heat pump mode and triangular circulation heating mode.

[0005] Optionally, in cooling mode, the refrigeration circuit of the passenger compartment includes a refrigerant cooling circuit. In the refrigerant cooling circuit, the compressor drives the refrigerant to flow through the water-cooled condenser and then into the five-way valve. After passing through the five-way valve, the refrigerant enters the evaporative condenser for cooling. The cooled refrigerant then enters the five-way valve again and sequentially enters the dryer receiver and the fourth throttling device before entering the evaporator. The evaporator absorbs the heat from the circulating air in the HVAC assembly through heat exchange. The cooled circulating air cools the passenger compartment, and the refrigerant flowing out of the evaporator returns to the compressor to be compressed again.

[0006] Optionally, in dehumidification mode, the passenger compartment dehumidification circuit includes a dehumidification refrigerant circuit and a dehumidification coolant circuit. In the dehumidification refrigerant circuit, the refrigerant is heated by the water-cooled condenser and then enters the dryer receiver via the five-way valve. After flowing out of the dryer receiver, it splits into a first dehumidification branch and a second dehumidification branch in parallel. The first dehumidification branch flows through the fourth throttling device into the evaporator for evaporation and heat absorption. The evaporator absorbs heat from the circulating air in the HVAC assembly through heat exchange, thus dehumidifying the circulating air. The second dehumidification branch flows... The refrigerant enters the evaporative condenser through the second throttling device to absorb heat from the environment. The refrigerant from the first and second dehumidification branches merges and returns to the compressor. In the dehumidification coolant circuit, the coolant enters the water-cooled condenser after passing through the first electronic water pump. After being heated in the water-cooled condenser, it flows through the water heating core to heat the circulating air in the HVAC assembly after being dehumidified by the evaporator. The circulating coolant enters the four-way valve after passing through the water heating core and then returns to the first electronic water pump.

[0007] Optionally, in air source heat pump mode, the passenger compartment heating circuit includes an air source heat pump refrigerant circuit and an air source heat pump coolant circuit. In the air source heat pump refrigerant circuit, the refrigerant enters the water-cooled condenser for heating under the drive of the compressor. After heating, the refrigerant passes through the five-way valve, the dryer receiver, and the second throttling device in sequence for throttling before entering the evaporative condenser to absorb heat from the environment. It then returns to the compressor through the five-way valve. In the air source heat pump coolant circuit, the coolant enters the water-cooled condenser after passing through the first electronic water pump and is heated in the water-cooled condenser before flowing through the water heating core to heat the circulating air in the HVAC assembly after dehumidification by the evaporator. The circulating coolant enters the four-way valve after passing through the water heating core and returns to the first electronic water pump after passing through the four-way valve.

[0008] Optionally, in water source heat pump mode, the crew cabin heating circuit includes a high-pressure water heating PTC circuit, a water source heat pump refrigerant circuit, and a water source heat pump coolant circuit. In the high-pressure water heating PTC circuit, the circulating coolant enters the high-pressure water heating PTC through the third electronic water pump for heating. The heated coolant then enters the three-way valve, then the seven-way valve, then the battery cooler, then the seven-way valve again, and finally returns to the third electronic water pump. In the water source heat pump refrigerant circuit, the refrigerant is driven by the compressor... The refrigerant enters the water-cooled condenser for heating. After heating, the refrigerant passes through the five-way valve, the dryer receiver, and the third throttling device for throttling before entering the battery cooler to evaporate the heat of the coolant. The evaporated refrigerant then returns to the compressor. In the water source heat pump coolant circuit, the coolant enters the water-cooled condenser after passing through the first electronic water pump. After being heated in the water-cooled condenser, it flows through the water heating core to heat the circulating air in the HVAC assembly after dehumidification by the evaporator. The circulating coolant then enters the four-way valve after passing through the four-way valve and returns to the first electronic water pump.

[0009] Optionally, in the triangular circulation heating mode, the passenger compartment heating circuit includes a triangular circulation refrigerant circuit and a triangular circulation coolant circuit. In the triangular circulation refrigerant circuit, the refrigerant discharged from the compressor is divided into a first branch and a second branch connected in parallel. The first branch flows through the first throttling device and then returns directly to the suction end of the compressor. The second branch flows through the water-cooled condenser to release heat, then flows through the third throttling device to the battery cooler for evaporation, and then returns to the suction end of the compressor. In the triangular circulation coolant circuit, the circulating coolant enters the water-cooled condenser through the first electronic water pump, is heated, and then enters the water heating core. The HVAC assembly circulating air is heated through the water heating core, and the circulating coolant enters the four-way valve after passing through the water heating core, and then returns to the first electronic water pump through the four-way valve.

[0010] Optionally, the cooling mode, the dehumidification mode, the air source heat pump mode, and the water source heat pump mode may further include activating the power battery pack cooling circuit when the temperature of the power battery pack is higher than a first preset value.

[0011] Optionally, the dehumidification mode, the air source heat pump mode, the water source heat pump mode, and the triangular circulation heating mode may further include activating the power battery pack heating circuit when the temperature of the power battery pack is lower than a second preset value.

[0012] Optionally, in the air source heat pump mode, the water source heat pump mode, and the triangular circulation heating mode, the drive motor insulation circuit can also be selectively activated.

[0013] Optionally, in the air source heat pump mode, the drive motor heating power battery pack circuit can also be selectively activated.

[0014] The above technical solution has the following beneficial effects: The electric vehicle thermal management system provided in this application can maintain the compressor's suction pressure through a first throttling device in low-temperature environments, enabling the compressor to perform triangular circulation heating. Simultaneously, the controller manages the connection status of the five-way, four-way, and seven-way valves, allowing the system to switch between cooling, dehumidification, air-source heat pump, water-source heat pump, and triangular circulation heating modes. The flow channel couples the refrigerant-side integrated unit and the coolant-side integrated unit, reducing the number of components and pipes used in traditional thermal management systems, thereby lowering the cost and weight of the thermal management system. Furthermore, in extremely low-temperature environments, the compressor coupled with a high-pressure water PTC allows the heat pump system to operate normally in such conditions. Compared to a system using only a high-pressure water PTC for heating, this system reduces resource waste by increasing the compressor's operating frequency and decreasing the heating power of the high-pressure water PTC while achieving the same heating capacity. Attached Figure Description

[0015] The preferred embodiments of this application will now be described in detail with reference to the accompanying drawings to aid in understanding the purpose and advantages of this application, wherein: Figure 1 A flowchart of an electric vehicle thermal management system provided in an optional embodiment of this application.

[0016] Figure 2 A schematic diagram of the various interfaces of the water-cooled condenser and the five-way valve provided in an optional embodiment of this application.

[0017] Figure 3 A schematic diagram of each interface of the seven-way valve and the four-way valve provided in the optional embodiments of this application.

[0018] Figure 4 A schematic diagram of the various interfaces of the expansion tank provided in an optional embodiment of this application.

[0019] Figure 5 This is a schematic diagram of the structure of each interface of the three-way valve provided in an optional embodiment of this application.

[0020] Figure 6 This is a schematic diagram of the structure of each interface of the battery cooler provided in an optional embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: First throttling device - 1, Compressor - 2, Refrigerant check valve - 3, Expansion tank - 4, First inlet of tank - 4a, Second inlet of tank - 4b, Third inlet of tank - 4c, Manual venting valve - 5, High-pressure water heater PTC - 6, Three-way valve - 7, First inlet of three-way valve - 7a, Second inlet of three-way valve - 7b, Third inlet of three-way valve - 7c, Power battery pack - 8, Front-end cooling unit - 10, Low-temperature radiator - 101, Evaporative condenser - 102, Cooling fan - 103, Refrigerant-side integrated unit - 20 Water-cooled condenser-201, condenser first interface-201a, condenser second interface-201b, condenser third interface-201c, condenser fourth interface-201d, five-way valve-202, five-way first interface-202a, five-way second interface-202b, five-way third interface-202c, five-way fourth interface-202d, five-way fifth interface-202e, dryer receiver-203, second throttling device-204, third throttling device-205, battery cooler-206, battery cooler first... Interface-206a, Battery Cooler Second Interface-206b, Battery Cooler Third Interface-206c, Battery Cooler Fourth Interface-206d, Fourth Throttling Device-207, Coolant Side Integrated Unit-30, First Electronic Water Pump-301, First Water Side Check Valve-302, Second Water Side Check Valve-303, Second Electronic Water Pump-304, Seven-Way Valve-305, Seven-Way First Interface-305a, Seven-Way Second Interface-305b, Seven-Way Third Interface-305c, Seven-Way Fourth Interface-30 5d, 7-way fifth interface-305e, 7-way sixth interface-305f, 7-way seventh interface-305g, 4-way valve-306, 4-way first interface-306a, 4-way second interface-306b, 4-way third interface-306c, 4-way fourth interface-306d, third electronic water pump-307, HVAC assembly-40, blower-401, evaporator-402, water heating core-403, low temperature cooling component-50, MCU-501, CDU-502, drive motor-503. Detailed Implementation

[0022] The technical solution of the present invention will be further described in detail below with reference to embodiments and accompanying drawings. The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0023] The electric vehicle thermal management system provided in this application includes: a first throttling device 1 and a compressor 2 connected in parallel, a high-pressure water heater PTC 6, a three-way valve 7 and a power battery pack 8, a front-end cooling unit 10, a refrigerant-side integrated unit 20, a coolant-side integrated unit 30, an HVAC assembly 40 and a controller.

[0024] Front-end cooling unit 10 evaporative condenser 102, such as Figure 1 As shown, the front-end cooling unit 10 may optionally include a low-temperature radiator 101 and a cooling fan 103.

[0025] The refrigerant-side integrated unit 20 includes a water-cooled condenser 201, a five-way valve 202, a dryer receiver 203, a second throttling device 204, a third throttling device 205, a fourth throttling device 207, and a battery cooler 206, all connected by pipes.

[0026] The coolant-side integrated unit 30 includes a first electronic water pump 301, a second electronic water pump 304, a third electronic water pump 307, a four-way valve 306, and a seven-way valve 305 connected by pipelines.

[0027] The HVAC assembly 40 includes an evaporator 402 and a water heating core 403, such as Figure 1 As shown, it also includes a blower 401.

[0028] Optionally, embodiments of this application may further include a cryogenic cooling component 50 comprising a drive motor 503, such as... Figure 1 As shown, it also includes MCU501 and CDU502.

[0029] The controller switches between cooling mode, dehumidification mode, air source heat pump mode, water source heat pump mode and triangular circulation heating mode by controlling the connection state of the five-way valve 202, four-way valve 306 and seven-way valve 305.

[0030] The first throttling device 1 is connected to the exhaust end and the suction end of the compressor 2 in parallel, and the five-way valve 202 has a refrigerant check valve 3 connected between the five-way valve 202's third port 202c and the compressor.

[0031] The following describes the connection piping of the refrigerant-side integrated unit 20. Please refer to the appendix. Figure 1The compressor 2's discharge end is connected to the B port of the refrigerant-side integrated unit 20. The compressor 2's suction end is connected to the E port and F port of the refrigerant-side integrated unit 20, and the outlet of the evaporator 402. The B port of the refrigerant-side integrated unit 20 is connected to the first condensing port 201a of the water-cooled condenser 201. The second condensing port 202b of the water-cooled condenser 201 is connected to the first five-way port 202a of the five-way valve 202. The second five-way port 202b of the five-way valve 202 is connected to the A port of the refrigerant-side integrated unit 20. The third five-way port 202c of the five-way valve 202 is connected to the F port of the refrigerant-side integrated unit 20. The fourth five-way port 202d of the five-way valve 202 is connected to the inlet of the dryer receiver 203. The fifth five-way port of the five-way valve 202... 202e is connected to the outlet of the second throttling device 204. The outlet of the dryer receiver 203 is connected to the inlet of the second throttling device 204, the inlet of the third throttling device 205, and the inlet of the fourth throttling device 207. The outlet of the third throttling device 205 is connected to the first battery cooler interface 206a of the battery cooler 206. The second battery cooler interface 206b of the battery cooler 206 is connected to the E interface of the refrigerant-side integrated unit 20. The outlet of the fourth throttling device 207 is connected to the D interface of the refrigerant-side integrated unit 20. The D interface of the refrigerant-side integrated unit 20 is connected to the inlet of the evaporator 402. The A interface of the refrigerant-side integrated unit 20 is connected to the first interface of the evaporative condenser 102. The second interface of the evaporative condenser 102 is connected to the C interface of the refrigerant-side integrated unit 20.

[0032] The following describes the piping connections for the coolant-side integrated unit 30. Please refer to the attached document. Figures 1 to 6The outlet of the first electronic water pump 301 is connected to the third condenser port 201c of the water-cooled condenser 201. The fourth condenser port 201d of the water-cooled condenser 201 is connected to the inlet of the water heating core 403. The outlet of the water heating core 403 is connected to the h port of the coolant-side integrated unit 30, the manual degassing valve 5, and the third water tank port 4c of the expansion tank 4. The first four-way port 306a of the four-way valve 306 is connected to the h port of the coolant-side integrated unit 30. The second four-way port 306b of the four-way valve 306 is connected to the inlet of the first electronic water pump 301. The third four-way port 306c of the four-way valve 306 is connected to the fifth seven-way port 305e of the seven-way valve 305. The fourth port 306d of the four-way valve 306 connects to the third port 305c of the seven-way valve 305 and the inlet of the third electronic water pump 307. The first port 305a of the seven-way valve 305 connects to the fourth port 206d of the battery cooler 206. The second port 305b of the seven-way valve 305 connects to the F port of the coolant-side integrated unit 30 and the inlet of the second water-side check valve 303. The fourth port 305d of the seven-way valve 305 connects to the third port 206c of the battery cooler 206. The fifth port 305e of the seven-way valve 305 connects to the third port 306c of the four-way valve 306 and the coolant-side integrated unit 307. The A port of the cooling liquid side integrated unit 30 is connected to the D port of the cooling liquid side integrated unit 30. The 7-way sixth port 305f of the 7-way valve 305 is connected to the inlet of the second electronic water pump 304 and the C port of the cooling liquid side integrated unit 30. The 7-way seventh port 305g of the 7-way valve 305 is connected to the inlet of the first water-side check valve 302 and the B port of the cooling liquid side integrated unit 30. The A and B ports of the cooling liquid side integrated unit 30 are respectively connected to the inlet and outlet ports of the low-temperature radiator 101. The C port of the cooling liquid side integrated unit 30 is connected to the first port 4a of the expansion tank 4. The D and E ports of the cooling liquid side integrated unit 30 are respectively connected to the inlet and outlet ports of the low-temperature cooling component 50. The cooling liquid side integrated unit 30... The F interface is connected to the second seven-way interface 305b of the seven-way valve 305, the third three-way interface 7c of the three-way valve 7, and the water outlet of the power battery pack 8 water cooling plate, respectively. The G interface of the coolant-side integrated unit 30 is connected to the water outlet of the third electronic water pump 307 and the water inlet of the high-pressure water heater PTC6, respectively. The outlet of the high-pressure water heater PTC6 is connected to the first three-way interface 7a of the three-way valve 7. The second three-way interface 7b of the three-way valve 7 is connected to the water inlet of the power battery pack 8 water cooling plate. The water outlets of the first water-side check valve 302 and the second water-side check valve 303 are connected to the water inlet of the first electronic water pump 301. The third water interface 4c of the expansion tank 4 is connected to the water outlet of the water heating core 403.

[0033] The electric vehicle thermal management system provided in this application, in low-temperature environments, such as when the ambient temperature is below -15℃, can maintain the suction pressure of the compressor 2 through the first throttling device 1, realizing the triangular circulation heating function of the compressor 2. Simultaneously, the controller controls the connection status of the five-way valve 202, four-way valve 306, and seven-way valve 305, allowing the system to switch between cooling mode, dehumidification mode, air source heat pump mode, water source heat pump mode, and triangular circulation heating mode. The flow channel couples the refrigerant-side integrated unit 20 and the coolant-side integrated unit 30, reducing the number of components and pipelines used in traditional thermal management systems, thereby reducing the cost and weight of the thermal management system. Furthermore, in extremely low-temperature environments, such as when the ambient temperature is below -15℃, the compressor 2 can work in conjunction with the high-pressure water PTC6, enabling the heat pump system to operate normally in extremely low-temperature environments. Compared to a system that uses high-pressure water PTC6 alone for heating, while achieving the same heating capacity, increasing the frequency of compressor 2 use reduces the heating power of the high-pressure water PTC6, thus reducing resource waste.

[0034] In an optional implementation, in cooling mode, the refrigeration circuit of the passenger compartment includes a refrigerant cooling circuit; the refrigeration circuit is as follows: the compressor 2 starts, and under the drive of the compressor 2, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201 and then enters the five-way valve 202. After passing through the first five-way port 202a and the second five-way port 202b of the five-way valve 202, it enters the evaporative condenser 102 for cooling. The cooled refrigerant then enters the five-way valve 202 again, passes through the fifth five-way port 202e and the fourth five-way port 202d of the five-way valve 202 and enters the dryer receiver 203. Then, after being throttled by the fourth throttling device 207, it enters the evaporator 402 to evaporate and absorb the heat of the circulating air in the HVAC assembly 40. The cooled circulating air cools the passenger compartment. Finally, the evaporated refrigerant returns to the compressor 2 for recompression, and this cycle is repeated to cool the passenger compartment.

[0035] In an optional implementation, in dehumidification mode, the crew cabin dehumidification circuit includes a dehumidification refrigerant circuit and a dehumidification coolant circuit. For the dehumidification refrigerant circuit, compressor 2 starts, and refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201, heating the circulating coolant before entering the five-way valve 202. After passing through the first five-way port 202a and the fourth five-way port 202d of the five-way valve 202, it enters the dryer receiver 203. After flowing out of the dryer receiver 203, it splits into parallel... The first dehumidification branch and the second dehumidification branch; the first dehumidification branch flows through the fourth throttling device 207 into the evaporator 402 to evaporate and absorb heat. The evaporator 402 absorbs heat from the circulating air in the HVAC assembly 40 through heat exchange, thus dehumidifying the circulating air; the second dehumidification branch flows through the second throttling device 204 into the evaporative condenser 102 to evaporate and absorb heat, thereby absorbing heat from the environment. The refrigerants from the first and second dehumidification branches are combined and returned to the compressor 2; this cycle is repeated to dehumidify the passenger compartment.

[0036] For the dehumidification coolant circuit, the first electronic water pump 301 is started. The circulating coolant enters the water-cooled condenser 201 after being heated by the first electronic water pump 301, and then enters the water heating core 403 after passing through the third condenser port 201c and the fourth condenser port 201d. The circulating air of the HVAC assembly 40 is dehumidified by the evaporator 402 and then heated by the water heating core 403. This is used to heat and dehumidify the circulating air in the HVAC assembly 40 after it has been dehumidified by the evaporator 402. After passing through the water heating core 403, the circulating coolant enters the four-way valve 306 and returns to the first electronic water pump 301 through the four-way first port 306a and the four-way second port 306b of the four-way valve 306.

[0037] In an optional implementation, in air-source heat pump mode, the passenger compartment heating circuit includes an air-source heat pump refrigerant circuit and an air-source heat pump coolant circuit. For the air-source heat pump refrigerant circuit, when compressor 2 starts, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201, heating the circulating coolant before entering the five-way valve 202. After passing through the first five-way port 202a and the fourth five-way port 202d of the five-way valve 202, it enters the dryer receiver 203, and then enters the second throttling device 204 for throttling. After throttling by the second throttling device 204, the refrigerant enters the evaporative condenser 102 to evaporate and absorb heat from the environment before entering the five-way valve 202 again. After passing through the second five-way port 202b and the third five-way port 202c of the five-way valve 202, it returns to compressor 2, and this cycle repeats to heat the passenger compartment. The evaporative condenser 102 acts as an evaporator, absorbing heat from the ambient air.

[0038] For the air source heat pump coolant circuit, the first electronic water pump 301 is started. The circulating coolant enters the water-cooled condenser 201 after being heated by the first electronic water pump 301. After passing through the third condenser port 201c and the fourth condenser port 201d, it enters the water heating core 403. The circulating air of the HVAC assembly 40 is heated by the water heating core 403 to achieve the purpose of heating the passenger compartment. After passing through the water heating core 403, the circulating coolant enters the four-way valve 306 and returns to the first electronic water pump 301 through the four-way first port 306a and the four-way second port 306b of the four-way valve 306.

[0039] In an optional implementation, in the water source heat pump mode, the crew cabin heating circuit includes a high-pressure water heating PTC circuit, a water source heat pump refrigerant circuit, and a water source heat pump coolant circuit, so as to realize that the heat pump and the high-pressure water heating PTC work together in the crew cabin heating circuit.

[0040] In the high-pressure water heating PTC circuit, the high-pressure water heating PTC6 and the third electronic water pump 307 start up, forming an independent auxiliary heating cycle. Specifically, the high-pressure water heating PTC6 and the third electronic water pump 307 start up simultaneously. The circulating coolant enters the high-pressure water heating PTC6 through the third electronic water pump 307 for heating. The heated coolant enters the three-way valve 7, passes through the three-way first port 7a and the three-way third port 7c of the three-way valve 7, enters the seven-way valve 305, passes through the seven-way second port 305b and the seven-way first port 305a of the seven-way valve 305, enters the battery cooler 206, passes through the battery cooler fourth port 206d and the battery cooler third port 206c of the battery cooler 206, and enters the seven-way valve 305 again. After passing through the seven-way fourth port 305d and the seven-way third port 305c of the seven-way valve 305, it returns to the third electronic water pump 307. This cycle repeats repeatedly to maintain the water temperature of the battery cooler 206, allowing the heat pump system to operate normally.

[0041] In the refrigerant circuit of the water source heat pump, when compressor 2 starts, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201, heating the circulating coolant before entering the five-way valve 202. It then passes through the first five-way port 202a and the fourth five-way port 202d of the five-way valve 202 and enters the dryer receiver 203. After being throttled by the third throttling device 205, the refrigerant enters the battery cooler 206 to evaporate and absorb heat from the circulating coolant. Finally, the evaporated refrigerant returns to compressor 2 for recompression, and this cycle repeats to heat the passenger compartment. The battery cooler 206 serves as the evaporator.

[0042] In the water source heat pump coolant circuit, the first electronic water pump 301 is started. The circulating coolant enters the water-cooled condenser 201 after being heated by the first electronic water pump 301. After passing through the third condensing port 201c and the fourth condensing port 201d of the water-cooled condenser 201, it enters the water heating core 403. The circulating air of the HVAC assembly 40 passes through the water heating core 403 and is heated to achieve the purpose of heating the passenger compartment. After passing through the water heating core 403, the circulating coolant enters the four-way valve 306 and returns to the first electronic water pump 301 through the four-way first port 306a and the four-way second port 306b of the four-way valve 306.

[0043] In this embodiment, the coolant flowing through the battery cooler 206 maintains its temperature as a heat source for the evaporator, thereby achieving the coupled operation of the heat pump and the high-pressure water heater PTC6.

[0044] In an optional implementation, in the triangular cycle heating mode, the crew compartment heating circuit includes a refrigerant circuit and a coolant circuit. Specifically, in the refrigerant circuit, the refrigerant discharged from the compressor 2 is divided into a first branch and a second branch connected in parallel; the first branch flows through the first throttling device 1 and then returns directly to the suction end of the compressor 2; the second branch flows through the water-cooled condenser 201 to release heat, and then through the third throttling device 205 to enter the battery cooler 206 for evaporation, and then returns to the suction end of the compressor 2. Furthermore, the refrigerant from the first and second branches mixes at the suction end of the compressor 2 to increase the suction pressure and suction superheat of the compressor 2.

[0045] In the coolant circuit, the circulating coolant enters the water-cooled condenser 201 through the first electronic water pump 301, is heated, and then enters the water heating core 403. The circulating air of the HVAC assembly 40 is heated by the water heating core 403. The circulating coolant enters the four-way valve after passing through the water heating core 403, and then returns to the first electronic water pump 301 through the four-way valve 306.

[0046] In an optional implementation, the cooling mode, dehumidification mode, air source heat pump mode, and water source heat pump mode further include selectively activating the power battery pack cooling circuit when the temperature of the power battery pack 8 is lower than a first preset value. In this embodiment, when the temperature sensor on the power battery pack detects that the temperature of the power battery pack 8 exceeds the first preset value, such as 40°C, it sends a cooling signal to the controller, and the controller activates the battery pack cooling circuit.

[0047] Specifically, in cooling mode, the refrigerant circuit in the power battery pack cooling circuit is as follows: When compressor 2 starts, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201 and then enters the five-way valve 202. After passing through the first five-way port 202a and the second five-way port 202b of the five-way valve 202, it enters the evaporative condenser 102 for cooling. The cooled refrigerant then enters the five-way valve 202 again, passes through the fifth five-way port 202e and the fourth five-way port 202d of the five-way valve 202, and enters the dryer receiver 203. Then, after passing through the third throttling device 205, it enters the battery cooler 206 to evaporate and absorb the heat of the circulating coolant. Finally, the evaporated refrigerant returns to compressor 2 for compression again, and this cycle repeats to cool the power battery pack.

[0048] The coolant circuit in the power battery pack cooling circuit is as follows: When the third electronic water pump 307 starts, the cooled circulating coolant flows through the fourth interface 206d and the third interface 206c of the battery cooler 206 and enters the seven-way valve 305. After passing through the seventh-way valve 305's seventh-way fourth interface 305d and seventh-way third interface 305c, it enters the third electronic water pump 307 and then enters the high-pressure water heater PTC6. Then, it passes through the third-way valve 7's third-way first interface 7a and third-way second interface 7b and enters the power battery pack 8 to cool the battery pack. After the circulating coolant flows out of the battery, it enters the seven-way valve 305 and returns to the battery cooler 206 through the seventh-way valve 305's seventh-way second interface 305b and seventh-way first interface 305a. This cycle repeats to cool the power battery pack.

[0049] Specifically, in dehumidification mode, the refrigerant circuit in the power battery pack cooling circuit is as follows: When compressor 2 starts, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201 and heats the circulating coolant before entering the five-way valve 202. After passing through the first five-way port 202a and the fourth five-way port 202d of the five-way valve 202, it enters the dryer receiver 203, and then enters the third throttling device 205 for throttling. After being throttled by the third throttling device 205, the refrigerant enters the battery cooler 206 to evaporate and absorb the heat of the circulating coolant. Finally, the evaporated refrigerant returns to compressor 2 for compression again, and this cycle repeats to cool the power battery pack.

[0050] The coolant circuit in the power battery pack cooling circuit is as follows: When the third electronic water pump 307 starts, the cooled circulating coolant flows through the fourth interface 206d and the third interface 206c of the battery cooler 206 and enters the seven-way valve 305. It then enters the third electronic water pump 307 through the seventh-way fourth interface 305d and the seventh-way third interface 305c of the seven-way valve 305. The high-pressure water heats the PTC6, and then enters the power battery pack 8 through the first interface 7a and the second interface 7b of the three-way valve 7 to cool the battery pack. After the circulating coolant flows out of the battery, it enters the seven-way valve 305 and returns to the battery cooler 206 through the second interface 305b and the first interface 305a of the seven-way valve 305. This cycle repeats to cool the power battery pack.

[0051] The second coolant circuit in the power battery pack cooling circuit is as follows: The second electronic water pump 304 and the third electronic water pump 307 start simultaneously. The circulating coolant passes through the second electronic water pump 304 and the high-pressure water heater PTC6, then enters the three-way valve 7. It then flows through the first three-way port 7a and the second three-way port 7b of the three-way valve 7 into the power battery pack 8 to cool the battery pack. After cooling the battery pack, it enters the seven-way valve 305, and then flows through the second seven-way port 305b and the first seven-way port 305a of the seven-way valve 305 into the battery cooler 206. The battery cooler's fourth port 206d and third port 206c enter the seven-way valve 305. After passing through the seventh port 305d and the sixth port 305f of the seven-way valve 305, the coolant enters the low-temperature cooling component 50 through the second electronic water pump 304 to cool the electric drive and other components. Then, it enters the low-temperature radiator 101 for cooling. After cooling, the coolant passes through the seventh port 305g and the third port 305c of the seven-way valve 305 and enters the third electronic water pump 307 again. This cycle is repeated to cool the battery pack.

[0052] Specifically, in air source heat pump mode, the refrigerant circuit in the power battery pack cooling circuit is as follows: When compressor 2 starts, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201 and heats the circulating coolant before entering the five-way valve 202. After passing through the first five-way port 202a and the fourth five-way port 202d of the five-way valve 202, it enters the dryer receiver 203, and then enters the third throttling device 205 for throttling. After being throttled by the third throttling device 205, the refrigerant enters the battery cooler 206 to evaporate and absorb the heat of the circulating coolant. Finally, the evaporated refrigerant returns to compressor 2 for compression again, and this cycle repeats to cool the power battery pack.

[0053] The coolant circuit in the power battery pack cooling circuit is as follows: When the third electronic water pump 307 starts, the cooled circulating coolant flows through the fourth interface 206d and the third interface 206c of the battery cooler 206 and enters the seven-way valve 305. It then enters the third electronic water pump 307 through the seventh-way fourth interface 305d and the seventh-way third interface 305c of the seven-way valve 305, and heats the PTC6 with high-pressure water. After passing through the first interface 7a and the second interface 7b of the three-way valve 7, it enters the power battery pack 8 to cool the battery pack. After the circulating coolant flows out of the battery, it enters the seven-way valve 305 and returns to the battery cooler 206 through the second interface 305b and the first interface 305a of the seven-way valve 305. This cycle repeats to cool the power battery pack 8.

[0054] Specifically, in the water source heat pump mode, the refrigerant circuit in the power battery pack 8 cooling circuit is as follows: Refrigerant circuit: When the compressor 2 starts, the refrigerant flows through the first condenser port 201a and the second condenser port 201b of the water-cooled condenser 201 and heats the circulating coolant before entering the five-way valve 202. After passing through the first five-way port 202a and the fourth five-way port 202d of the five-way valve 202, it enters the dryer receiver 203, and then enters the third throttling device 205 for throttling. After being throttled by the third throttling device 205, the refrigerant enters the battery cooler 206 to evaporate and absorb the heat of the circulating coolant. Finally, the evaporated refrigerant returns to the compressor 2 for compression again, and so on, to cool the power battery pack 8.

[0055] The coolant circuit in the power battery pack cooling circuit is as follows: When the third electronic water pump 307 starts, the cooled circulating coolant flows through the fourth interface 206d and the third interface 206c of the battery cooler 206 and enters the seven-way valve 305. It then enters the third electronic water pump 307 through the seventh-way fourth interface 305d and the seventh-way third interface 305c of the seven-way valve 305. The high-pressure water heats the PTC6, and then enters the power battery pack 8 through the first interface 7a and the second interface 7b of the three-way valve 7 to cool the battery pack. After the circulating coolant flows out of the battery, it enters the seven-way valve 305 and returns to the battery cooler 206 through the second interface 305b and the first interface 305a of the seven-way valve 305. This cycle repeats to cool the power battery pack.

[0056] In an optional implementation, the dehumidification mode, the air source heat pump mode, the water source heat pump mode, and the triangular circulation heating mode further include activating the heating circuit of the power battery pack 8 when the temperature of the power battery pack 8 is lower than a second preset value. In this embodiment, when the temperature sensor on the power battery pack 8 detects that the temperature of the power battery pack 8 is lower than the second preset temperature, such as 10°C, it sends a heating signal to the controller, and the controller activates the heating circuit of the battery pack 8.

[0057] Specifically, in dehumidification mode, the coolant circuit in the power battery pack heating circuit is as follows: The first electronic water pump 301 is started, and the circulating coolant enters the water-cooled condenser 201 after being heated by the first electronic water pump 301. After passing through the third condenser port 201c and the fourth condenser port 201d, it enters the water heating core 403. After passing through the water heating core 403, the circulating coolant enters the four-way valve 306. Then, it enters the third electronic water pump 307 and the high-pressure water heater PTC6 through the first four-way port 306a and the second four-way port 306d of the four-way valve 306. Then, it enters the power battery pack 8 through the first three-way port 7a and the second three-way port 7b of the three-way valve 7 to heat the battery pack. After the coolant heats the power battery pack 8, it returns to the first electronic water pump 301 after passing through the second water-side check valve 303. This cycle repeats to heat the power battery pack.

[0058] Specifically, in air source heat pump mode, the coolant circuit in the power battery pack heating circuit is as follows: the first electronic water pump 301 and the third electronic water pump 307 start simultaneously. The circulating coolant enters the water-cooled condenser 201 through the first electronic water pump 301, is heated, and then enters the water heating core 403 through the third condenser port 201c and the fourth condenser port 201d. After passing through the water heating core 403, the circulating coolant enters the four-way valve 306, and then enters the third electronic water pump 307 and the high-pressure water heater PTC6 through the first four-way port 306a and the fourth four-way port 306d of the four-way valve 306. Then, it enters the power battery pack 8 through the first three-way port 7a and the second three-way port 7b of the three-way valve 7 to heat the battery pack. After the coolant heats the power battery pack 8, it returns to the first electronic water pump 301 through the second water-side check valve 303. This cycle repeats to heat the power battery pack 8.

[0059] Specifically, in the water source heat pump mode, the coolant circuit in the power battery pack heating circuit is as follows: the high-pressure water heater PTC6 and the third electronic water pump 307 start simultaneously. The circulating coolant enters the high-pressure water heater PTC6 through the third electronic water pump 307 for heating. The heated coolant enters the three-way valve 7, passes through the three-way first port 7a and the three-way second port 7b of the three-way valve 7, enters the power battery pack 8 to heat the battery pack, and then enters the seven-way valve 305. It passes through the seven-way second port 305b and the seven-way first port 305a of the seven-way valve 305 to enter the battery cooler 206. It passes through the battery cooler fourth port 206d and the battery cooler third port 206c of the battery cooler 206 and enters the seven-way valve 305 again. It passes through the seven-way fourth port 305d and the seven-way third port 305c of the seven-way valve 305 and returns to the third electronic water pump 307. This cycle repeats to heat the power battery pack 8.

[0060] Specifically, in the triangular circulation heating mode, the coolant circuit in the power battery pack heating circuit includes circuit one, where the compressor triangular circulation heats the power battery pack, and circuit two, where the high-pressure water heating PTC heats the power battery pack. For circuit one, the first electronic water pump 301 and the third electronic water pump 307 start simultaneously. The circulating coolant enters the water-cooled condenser 201 through the first electronic water pump 301, is heated, and then enters the water heating core 403 through the third condenser port 201c and the fourth condenser port 201d. After passing through the water heating core 403, the circulating coolant enters the four-way valve 306, and then enters the third electronic water pump 307 and the high-pressure water heating PTC 6 through the first four-way port 306a and the fourth four-way port 306d. Then, it enters the power battery pack 8 through the first three-way port 7a and the second three-way port 7b of the three-way valve 7 to heat the battery pack. After heating the power battery pack 8, the coolant returns to the first electronic water pump 301 through the second water-side check valve 303, and this cycle repeats to heat the power battery pack.

[0061] For loop two, the high-pressure water heater PTC6 and the third electronic water pump 307 start simultaneously. The circulating coolant enters the high-pressure water heater PTC6 through the third electronic water pump 307, is heated, passes through the three-way valve 7, and then enters the power battery pack 8 through the three-way first port 7a and the three-way second port 7b to heat the battery pack. After entering the seven-way valve 305, it enters the third electronic water pump 307 again through the seven-way second port 305b and the seven-way third port 305c. This cycle repeats to heat the power battery pack.

[0062] In an optional implementation, the drive motor insulation circuit can also be selectively activated in the air source heat pump mode, the water source heat pump mode, and the triangular circulation heating mode. When the ambient temperature is low, such as below 10°C, the motor reduces heat loss through the insulation circuit.

[0063] Specifically, in air source heat pump mode, the drive motor insulation circuit is as follows: the second electronic water pump 304 starts, the circulating coolant enters the low-temperature cooling component 50 through the second electronic water pump 304, and then enters the seven-way valve 305. After passing through the seventh port 5e and the seventh port 6f of the seven-way valve 305, it returns to the second electronic water pump 304. This cycle is repeated to store the heat of the low-temperature cooling component 50.

[0064] Specifically, in the water source heat pump mode, the drive motor insulation circuit is as follows: the second electronic water pump 304 starts, the circulating coolant enters the low-temperature cooling component 50 through the second electronic water pump 304, and then enters the seven-way valve 305. After passing through the seventh port 5e and the seventh port 6f of the seven-way valve 305, it returns to the second electronic water pump 304. This cycle is repeated to store the heat of the low-temperature cooling component 50.

[0065] Specifically, in the triangular circulation heating mode, the drive motor insulation circuit is as follows: the second electronic water pump 304 is started, and the circulating coolant enters the low-temperature cooling component 50 through the second electronic water pump 304, then enters the seven-way valve 305, and returns to the second electronic water pump 304 after passing through the seventh-way fifth port 305e and the seventh-way sixth port 305f of the seven-way valve 305. This cycle is repeated to store the heat of the low-temperature cooling component 50.

[0066] In addition, it should be noted that the cooling mode, the dehumidification mode, the air source heat pump mode, and the water source heat pump mode are also equipped with a drive motor cooling circuit.

[0067] Specifically, in the cooling mode, dehumidification mode, air source heat pump mode, and water source heat pump mode, the drive motor cooling circuit is as follows: the second electronic water pump 304 is started, and the circulating coolant enters the low-temperature cooling component 50 after passing through the second electronic water pump 304 to cool the electric drive and other components, and then enters the low-temperature radiator 101 for cooling. After cooling, the coolant enters the second electronic water pump 304 again after passing through the seven-way valve 305's seventh port 305g and sixth port 305f, and so on, to cool the electric drive.

[0068] In addition, the water source heat pump mode also includes a simultaneous cooling circuit for the drive motor and the power battery, specifically as follows: the second electronic water pump 304 and the third electronic water pump 307 start simultaneously. The circulating coolant enters the low-temperature cooling component 50 through the second electronic water pump 304 to cool the electric drive and other components, and then enters the seven-way valve 305. After passing through the seventh-way valve 305's fifth port 305e and seventh-way third port 305c, it enters the third electronic water pump 307, the high-pressure water heater PTC 6, and the three-way valve 7. After passing through the three-way valve 7's first port 7... a) The third port 7c of the three-way valve re-enters the seven-way valve 305, and then enters the battery cooler 206 through the second port 305b and the first port 305a of the seven-way valve 305 to be cooled. The cooled coolant then enters the seven-way valve 305 through the fourth port 206d and the third port 206c of the battery cooler 206, and then returns to the second electronic water pump 304 through the fourth port 305d and the sixth port 305f of the seven-way valve 305. This cycle repeats to cool the electric drive and the battery.

[0069] In an optional implementation, in the air source heat pump mode, the drive motor can also be selectively turned on to heat the power battery pack circuit. In this embodiment, when the temperature sensor detects that the temperature of the power battery pack 8 is between 0-10°C, the amount of heat required for battery heating is small. Heating the drive battery circuit by the drive motor helps to reduce energy consumption. Specifically, the second electronic water pump 304 and the third electronic water pump 307 start simultaneously. The circulating coolant enters the low-temperature cooling component 50 through the second electronic water pump 304 to cool the electric drive and other components. Then it enters the seven-way valve 305, passes through the seventh-way valve 305 fifth port 305e and seventh-way valve 305 third port 305c, enters the third electronic water pump 307, the high-pressure water heater PTC 6, and the three-way valve 7. After passing through the three-way valve 7 three-way valve 7 first port 7a and three-way valve 7b, it enters the power battery pack 8 to heat the battery pack. Then it enters the seven-way valve 305, passes through the seven-way valve 305 seventh port 305 second port 305b and seven-way valve 305 sixth port 305f, and returns to the second electronic water pump 304. This cycle repeats repeatedly to achieve the purpose of heating the power battery pack by the electric drive.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A thermal management system for electric vehicles, characterized in that, include: The first throttling device (1) and compressor (2) connected in parallel, high-pressure water heating PTC (6), three-way valve (7) and power battery pack (8); The front-end cooling unit (10) includes an evaporative condenser (102); The refrigerant-side integrated unit (20) includes a water-cooled condenser (201), a five-way valve (202), a second throttling device (204), a third throttling device (205), a fourth throttling device (207), and a battery cooler (206) connected by pipes. The coolant-side integrated unit (30) includes a first electronic water pump (301), a second electronic water pump (304), a third electronic water pump (307), a four-way valve (306), and a seven-way valve (305) connected by pipelines. HVAC assembly (40), including evaporator (402) and water heating core (403); The controller controls the connection status of the five-way valve (202), the four-way valve (306) and the seven-way valve (305) to enable the electric vehicle to switch between cooling mode, dehumidification mode, air source heat pump mode, water source heat pump mode and triangular circulation heating mode. In dehumidification mode, the crew cabin dehumidification circuit includes a dehumidification refrigerant circuit and a dehumidification coolant circuit; In the dehumidification refrigerant circuit, the refrigerant is heated by the water-cooled condenser (201) and then enters the dryer receiver (203) through the five-way valve (202). After flowing out of the dryer receiver (203), it is divided into a first dehumidification branch and a second dehumidification branch in parallel. The first dehumidification branch flows through the fourth throttling device (207) and enters the evaporator (402) to evaporate and absorb heat. The evaporator (402) absorbs the heat of the circulating air in the HVAC assembly (40) through heat exchange to dehumidify the circulating air. The second dehumidification branch flows through the second throttling device (204) and enters the evaporative condenser (102) to evaporate and absorb heat, which is used to absorb heat from the environment. The refrigerants from the first dehumidification branch and the second dehumidification branch are combined and returned to the compressor (2). In the dehumidification coolant circuit, the coolant enters the water-cooled condenser (201) after passing through the first electronic water pump (301) and is heated in the water-cooled condenser (201) before flowing through the water heating core (403) to heat the circulating air in the HVAC assembly (40) after being dehumidified by the evaporator (402). The circulating coolant enters the four-way valve (306) after passing through the water heating core (403) and returns to the first electronic water pump (301) after passing through the four-way valve (306). In the triangular cycle heating mode, the crew cabin heating circuit includes a triangular cycle refrigerant circuit and a triangular cycle coolant circuit; In the triangular refrigerant loop, the refrigerant discharged from the compressor (2) is divided into a first branch and a second branch connected in parallel. The first branch flows through the first throttling device (1) and then returns directly to the suction end of the compressor (2). The second branch flows through the water-cooled condenser (201) to release heat, and then enters the battery cooler (206) for evaporation through the third throttling device (205), and then returns to the suction end of the compressor (2). In the triangular circulating coolant circuit, the circulating coolant enters the water-cooled condenser (201) through the first electronic water pump (301), is heated, and then enters the water heating core (403). The circulating air of the HVAC assembly (40) is heated by the water heating core (403). The circulating coolant enters the four-way valve after passing through the water heating core (403) and returns to the first electronic water pump (301) through the four-way valve (306).

2. The electric vehicle thermal management system according to claim 1, characterized in that, In cooling mode, the refrigeration circuit of the crew compartment includes a refrigerant cooling circuit; In the cooling refrigerant circuit, the compressor (2) drives the refrigerant to flow through the water-cooled condenser (201) and then into the five-way valve (202). After passing through the five-way valve (202), the refrigerant enters the evaporative condenser (102) for cooling. The cooled refrigerant then enters the five-way valve (202) again and passes through the five-way valve (202) in sequence into the dryer receiver (203) and the fourth throttling device (207) before entering the evaporator (402). The evaporator (402) absorbs the heat of the circulating air in the HVAC assembly (40) through heat exchange. The cooled circulating air cools the passenger compartment. The refrigerant flowing out of the evaporator (402) returns to the compressor (2) and is compressed.

3. The electric vehicle thermal management system according to claim 2, characterized in that, In air source heat pump mode, the crew cabin heating circuit includes an air source heat pump refrigerant circuit and an air source heat pump coolant circuit; In the air source heat pump refrigerant circuit, the refrigerant enters the water-cooled condenser (201) for heating under the drive of the compressor (2). After heating, the refrigerant passes through the five-way valve (202), the dry liquid receiver (203), and the second throttling device (204) in sequence for throttling, and then enters the evaporative condenser (102) to absorb heat from the environment, and then returns to the compressor (2) through the five-way valve (202). In the air source heat pump coolant circuit, the coolant enters the water-cooled condenser (201) after passing through the first electronic water pump (301) and is heated by the water-cooled condenser (201) before flowing through the water heating core (403) to heat the circulating air in the HVAC assembly (40) after it has been dehumidified by the evaporator (402). The circulating coolant enters the four-way valve (306) after passing through the water heating core (403) and returns to the first electronic water pump (301) after passing through the four-way valve (306).

4. The electric vehicle thermal management system according to claim 1, characterized in that, In water source heat pump mode, the crew cabin heating circuit includes a high-pressure water heating PTC circuit, a water source heat pump refrigerant circuit, and a water source heat pump coolant circuit. In the high-pressure water heating PTC circuit, the circulating coolant enters the high-pressure water heating PTC (6) through the third electronic water pump (307) for heating. The heated coolant enters the three-way valve (7), then enters the seven-way valve (305), then enters the battery cooler (206), then enters the seven-way valve (305) again, and finally returns to the third electronic water pump (307). In the refrigerant circuit of the water source heat pump, the refrigerant enters the water-cooled condenser (201) for heating under the drive of the compressor (2). After heating, the refrigerant passes through the five-way valve (202), the dry liquid receiver (203), and the third throttling device (205) in sequence for throttling, and then enters the battery cooler (206) to evaporate the heat of the coolant. The evaporated refrigerant returns to the compressor (2). In the water source heat pump coolant circuit, the coolant enters the water-cooled condenser (201) after passing through the first electronic water pump (301) and is heated by the water-cooled condenser (201) before flowing through the water heating core (403) to heat the circulating air in the HVAC assembly (40) after it has been dehumidified by the evaporator (402). The circulating coolant enters the four-way valve (306) after passing through the water heating core (403) and returns to the first electronic water pump (301) after passing through the four-way valve (306).

5. The electric vehicle thermal management system according to claim 1, characterized in that, The cooling mode, the dehumidification mode, the air source heat pump mode, and the water source heat pump mode also include activating the power battery pack cooling circuit when the temperature of the power battery pack (8) is higher than a first preset value.

6. The electric vehicle thermal management system according to claim 1, characterized in that, The dehumidification mode, the air source heat pump mode, the water source heat pump mode, and the triangular circulation heating mode also include activating the power battery pack heating circuit when the temperature of the power battery pack (8) is lower than the second preset value.

7. The electric vehicle thermal management system according to claim 1, characterized in that, In the air source heat pump mode, the water source heat pump mode, and the triangular circulation heating mode, the heat preservation circuit of the drive motor can also be selectively activated.

8. The electric vehicle thermal management system according to claim 1, characterized in that, In the air source heat pump mode, the drive motor heating power battery pack circuit can also be selectively activated.

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