A new energy vehicle thermal management system and a thermal management method

Abstract

This invention discloses a thermal management system for new energy vehicles, characterized by comprising a battery thermal management circuit, an electric drive thermal management circuit, a heating circuit, an air conditioning thermal management circuit, a plate heat exchanger, a battery cooler, a water-cooled condenser, and a seven-way valve. Compared with existing technologies, this invention achieves series / parallel connection of the battery thermal management circuit, electric drive thermal management circuit, heating circuit, air conditioning thermal management circuit, plate heat exchanger, battery cooler, and water-cooled condenser through the seven-way valve. The system has functions such as battery heating / cooling / waste heat utilization, electric drive cooling / waste heat utilization, and battery / electric drive system filling and venting. It is comprehensive in function and has the advantages of fewer components, lower cost, and lower system complexity, which is conducive to integrated design and platform vehicle expansion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle thermal management systems, in particular to a new energy vehicle thermal management system and a thermal management method. BACKGROUND

[0002] The new energy vehicle refers to a vehicle that meets the requirements of road traffic and safety regulations and is driven by a vehicle-mounted power source and a motor.

[0003] The existing thermal management system of the new energy vehicle generally includes a battery thermal management circuit, an electric drive thermal management circuit, a heating circuit, and an air conditioning thermal management circuit. SUMMARY

[0004] The present application aims to provide a new energy vehicle thermal management system and a thermal management method to solve the technical problems in the prior art.

[0005] In a first aspect, the present application provides a new energy vehicle thermal management system, comprising a battery thermal management circuit, an electric drive thermal management circuit, a heating circuit, an air conditioning thermal management circuit, a plate heat exchanger, a battery cooler, a water-cooled condenser, and a seven-way valve, wherein:

[0006] The battery thermal management circuit comprises a battery pack, the liquid inlet of the battery pack is connected to the fourth port of the seven-way valve, the liquid outlet of the battery pack is connected to the cold side of the plate heat exchanger, and the cold side of the plate heat exchanger is connected to the sixth port of the seven-way valve.

[0007] The electric drive thermal management circuit comprises a low-temperature radiator, a vehicle-mounted charger, and a drive motor connected in sequence, the liquid outlet of the drive motor is connected to the fifth port of the seven-way valve, the liquid inlet of the low-temperature radiator is connected to the third port of the seven-way valve, and the first port of the seven-way valve is connected to the pipeline between the low-temperature radiator and the vehicle-mounted charger.

[0008] The heating circuit comprises a three-way valve and a warm air core, the first interface of the three-way valve, the second interface of the three-way valve, the warm air core, and the water side of the water-cooled condenser are connected in sequence to form a circulation loop, the liquid inlet of the hot side of the plate heat exchanger is connected to the third interface of the three-way valve, and the liquid outlet of the hot side of the plate heat exchanger is connected to the liquid inlet of the refrigerant side of the water-cooled condenser.

[0009] The air conditioning thermal management circuit includes an evaporator, a compressor, and an air condenser. The refrigerant sides of the evaporator, the compressor, and the water-cooled condenser are sequentially connected to form a circulation loop. The liquid inlet of the evaporator is equipped with a first electronic expansion valve. The battery cooler is connected in parallel with the evaporator. The liquid inlet on the refrigerant side of the battery cooler is connected to the liquid outlet on the refrigerant side of the water-cooled condenser. The liquid inlet of the battery cooler is equipped with a second electronic expansion valve. The air condenser is connected in parallel with the water-cooled condenser. The liquid inlet of the air condenser is equipped with a first shut-off valve, and the liquid inlet on the refrigerant side of the water-cooled condenser is equipped with a second shut-off valve.

[0010] The water inlet of the battery cooler is connected to the seventh port of the seven-way valve, and the water outlet of the battery cooler is connected to the second port of the seven-way valve.

[0011] In the new energy vehicle thermal management system described above, preferably, a high-pressure PTC is provided on the heating circuit, the inlet of the high-pressure PTC is connected to the outlet of the water-cooled condenser on the water side, and the outlet of the high-pressure PTC is connected to the first interface of the three-way valve.

[0012] In the new energy vehicle thermal management system described above, preferably, a first expansion tank is also provided, which is connected to the electric drive thermal management circuit.

[0013] In the new energy vehicle thermal management system described above, preferably, a second expansion tank is also provided, which is connected to the heating circuit.

[0014] In the new energy vehicle thermal management system described above, preferably, a liquid storage and drying bottle is provided on the air conditioning thermal management circuit, and the liquid storage and drying bottle is located on the pipeline between the water-cooled condenser and the evaporator.

[0015] In the new energy vehicle thermal management system described above, preferably, the air conditioning thermal management circuit is provided with a first coaxial pipe and a second coaxial pipe, the first coaxial pipe being located on the pipeline between the water-cooled condenser and the evaporator, and the second coaxial pipe being located on the pipeline between the evaporator and the compressor.

[0016] In the new energy vehicle thermal management system described above, preferably, both the inlet and outlet of the compressor are equipped with temperature and pressure sensors.

[0017] In the new energy vehicle thermal management system described above, preferably, temperature sensors are provided at the liquid inlet of the low-temperature radiator, the liquid outlet of the low-temperature radiator, the liquid inlet of the battery pack, the liquid inlet of the on-board charger, the liquid outlet of the high-voltage PTC, and the liquid outlet of the evaporator.

[0018] In the new energy vehicle thermal management system described above, preferably, an electronic water pump is provided on the pipes at the liquid inlet of the on-board charger, the liquid inlet of the water-cooled condenser, and the liquid inlet of the battery pack.

[0019] Secondly, the present invention also provides a thermal management method for new energy vehicles, which utilizes the aforementioned new energy vehicle thermal management system for thermal management, and the thermal management method includes the following thermal management modes:

[0020] First mode: The first port of the seven-way valve is closed, the second port is connected to the fourth port, the third port is connected to the fifth port, the sixth port is connected to the seventh port, the first electronic expansion valve is open, the second electronic expansion valve is open, the first shut-off valve is open, and the second shut-off valve is closed.

[0021] Second mode: The first port of the seven-way valve is closed, the second port is connected to the fourth port, the third port is connected to the fifth port, the sixth port is connected to the seventh port, the first electronic expansion valve is closed, the second electronic expansion valve is closed, the first shut-off valve is closed, and the second shut-off valve is closed.

[0022] Third mode: The first port of the seven-way valve is closed, the second port is connected to the third port, the fourth port is connected to the sixth port, the fifth port is connected to the seventh port, the first electronic expansion valve is closed, the second electronic expansion valve is open, the first shut-off valve is closed, and the second shut-off valve is open.

[0023] Fourth mode: The third port of the seven-way valve is closed, the first port is connected to the second port, the fourth port is connected to the sixth port, the fifth port is connected to the seventh port, the first electronic expansion valve is closed, the second electronic expansion valve is open, the first shut-off valve is closed, and the second shut-off valve is open.

[0024] Mode 5: The third port of the seven-way valve is closed, the first port is connected to the second port, the fourth port is connected to the fifth port, the sixth port is connected to the seventh port, the first electronic expansion valve is closed, the second electronic expansion valve is open, the first shut-off valve is closed, and the second shut-off valve is open.

[0025] Compared with existing technologies, this invention achieves series / parallel connection of battery thermal management circuit, electric drive thermal management circuit, heating circuit, air conditioning thermal management circuit, plate heat exchanger, battery cooler and water-cooled condenser by setting a seven-way valve. The system has functions such as battery heating / cooling / waste heat utilization, electric drive cooling / waste heat utilization and battery / electric drive system filling and venting. It has comprehensive functions and has the advantages of fewer parts, lower cost and lower system complexity, which is conducive to integrated design and platform vehicle expansion. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the working principle of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100 - Battery thermal management circuit; 101 - Battery pack;

[0029] 200-Electric drive thermal management circuit, 201-Low temperature radiator, 202-On-board charger, 203-Drive motor, 204-First expansion tank;

[0030] 300-Heating circuit, 301-Three-way valve, 3011-First interface, 3012-Second interface, 3013-Third interface, 302-Heat air core, 303-High pressure PTC, 304-Second expansion tank;

[0031] 400-Air conditioning thermal management circuit, 401-Evaporator, 402-Compressor, 403-Air condenser, 404-First electronic expansion valve, 405-Second electronic expansion valve, 406-First shut-off valve, 407-Second shut-off valve, 408-Liquid receiver drying bottle, 409-First coaxial tube, 410-Second coaxial tube, 411-Temperature and pressure sensor;

[0032] 500-Plate Heat Exchanger;

[0033] 600-Battery Cooler;

[0034] 700-Water-cooled condenser;

[0035] 800 - Seven-way valve, 801 - First port, 802 - Second port, 803 - Third port, 804 - Fourth port, 805 - Fifth port, 806 - Sixth port, 807 - Seventh port;

[0036] 900 - Temperature Sensor;

[0037] 1000-Electronic Water Pump. Detailed Implementation

[0038] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] Firstly, such as Figure 1 As shown, an embodiment of the present invention provides a thermal management system for a new energy vehicle, including a battery thermal management circuit 100, an electric drive thermal management circuit 200, a heating circuit 300, an air conditioning thermal management circuit 400, a plate heat exchanger 500, a battery cooler 600, a water-cooled condenser 700, and a seven-way valve 800, wherein:

[0040] The battery thermal management circuit 100 includes a battery pack 101. The inlet of the battery pack 101 is connected to the fourth port 804 of a seven-way valve 800. A temperature sensor 900 and an electric water pump 1000 are also installed on this pipeline. The temperature sensor 900 senses the temperature of the refrigerant entering the battery pack 101 and converts it into a usable output signal. The electric water pump 1000 pressurizes the refrigerant in the pipeline to ensure its circulation within the battery thermal management circuit 100, thereby facilitating heat transfer. The outlet of the battery pack 101 is connected to a plate. The cold side of the plate heat exchanger 500 is connected to the sixth port 806 of the seven-way valve 800. The plate heat exchanger 500 includes a cold side and a hot side, both of which are refrigerant channels. The refrigerant between the cold side and the hot side can exchange heat. The structure of the plate heat exchanger 500 can refer to the existing technology and will not be described in detail here. The refrigerant sent from the fourth port 804 of the seven-way valve 800 flows sequentially through the battery pack 101 and the cold side of the plate heat exchanger 500 before flowing into the sixth port 806 of the seven-way valve 800.

[0041] The electric drive thermal management circuit 200 includes a low-temperature radiator 201, an on-board charger 202, and a drive motor 203 connected in sequence. The outlet of the drive motor 203 is connected to the fifth port 805 of the seven-way valve 800, and the inlet of the low-temperature radiator 201 is connected to the third port 803 of the seven-way valve 800. The first port 801 of the seven-way valve 800 is connected to the pipeline between the low-temperature radiator 201 and the on-board charger 202. The refrigerant sent from the third port 803 of the seven-way valve 800 passes through the low-temperature radiator 201, the on-board charger 202, and the drive motor 203 in sequence before being sent to the fifth port 805 of the seven-way valve 800. The refrigerant sent from the first port 801 of the seven-way valve 800 is transported to the pipeline between the low-temperature radiator 201 and the on-board charger 202.

[0042] A temperature sensor 900 and an electric water pump 1000 are also installed on the pipeline between the low-temperature radiator 201 and the on-board charger 202. The temperature sensor 900 can sense the temperature of the refrigerant sent by the low-temperature radiator 201 and convert it into a usable output signal. The function of the electric water pump 1000 is to pressurize the refrigerant in the pipeline to ensure that it circulates in the electric thermal management circuit 200, thereby transferring heat.

[0043] A temperature sensor 900 is also provided at the liquid inlet of the low-temperature radiator 201, which can sense the temperature of the refrigerant entering the low-temperature radiator 201 and convert it into a usable output signal. A temperature sensor 900 is also provided at the liquid inlet of the on-board charger 202, which can sense the temperature of the refrigerant entering the on-board charger 202 and convert it into a usable output signal.

[0044] The heating circuit 300 includes a three-way valve 301 and a heater core 302. The first port 3011 and the second port 3012 of the three-way valve 301, the heater core 302, and the water side of the water-cooled condenser 700 are sequentially connected to form a circulation circuit. The liquid inlet on the hot side of the plate heat exchanger 500 is connected to the third port 3013 of the three-way valve 301, and the liquid outlet on the hot side of the plate heat exchanger 500 is connected to the liquid inlet on the refrigerant side of the water-cooled condenser 700. The first port 3011, the second port 3012, and the third port 3013 of the three-way valve 301 can be selectively opened and closed to adjust the refrigerant delivery path. At the plate heat exchanger 500, the refrigerant in the heating circuit 300 can exchange energy with the refrigerant in the battery thermal management circuit 100. At the water-cooled condenser 700, the refrigerant in the heating circuit 300 can exchange energy with the refrigerant in the air conditioning thermal management circuit 400.

[0045] In the heating circuit 300, an electronic water pump 1000 is also provided to pressurize the refrigerant in the pipeline, ensuring its circulation in the heating circuit 300 for heat transfer. At the same time, a high-pressure PTC 303 is also provided to heat the refrigerant in the heating circuit 300. A temperature sensor 900 is provided at the high-pressure PTC 303 to monitor the temperature of the refrigerant at the high-pressure PTC 303. In addition, a second expansion tank 304 is provided. The inlet end of the second expansion tank 304 is also equipped with a throttle valve. If the pressure in the pipeline is too high or there is too much refrigerant, the excess gas and refrigerant will flow out from the bypass water channel of the second expansion tank 304 to avoid excessive pressure in the system.

[0046] The electric thermal management system is also equipped with a first expansion tank 204. The first expansion tank 204 is used to replenish the refrigerant in the pipes of the electric thermal management circuit 200. The first expansion tank 204 can be connected to the low-temperature radiator 201. If the pressure in the pipes is too high or there is too much refrigerant, the excess gas and refrigerant will flow out from the bypass channel of the first expansion tank 204 to avoid excessive pressure in the system.

[0047] The air conditioning thermal management circuit 400 includes an evaporator 401, a compressor 402, and an air condenser 403. The refrigerant sides of the evaporator 401, compressor 402, and water-cooled condenser 700 are sequentially connected to form a circulation circuit. The liquid inlet of the evaporator 401 is equipped with a first electronic expansion valve 404. The battery cooler 600 is connected in parallel with the evaporator 401. The liquid inlet on the refrigerant side of the battery cooler 600 is connected to the liquid outlet on the refrigerant side of the water-cooled condenser 700. The liquid inlet of the battery cooler 600 is equipped with a second electronic expansion valve 405. The air condenser 403 is connected in parallel with the water-cooled condenser 700. The liquid inlet of the air condenser 403 is equipped with a first shut-off valve 406. The liquid inlet on the refrigerant side of the water-cooled condenser 700 is equipped with a second shut-off valve 407. At the battery cooler 600, the refrigerant in the air conditioning thermal management circuit 400 exchanges heat with the refrigerant in the battery thermal management circuit 100.

[0048] Both the first shut-off valve 406 and the second shut-off valve 407 have two states: open and closed. When both the first shut-off valve 406 and the second shut-off valve 407 are open, the refrigerant passes through the water-cooled condenser 700 and the air condenser 403, respectively. When one of the first shut-off valve 406 or the second shut-off valve 407 is open and the other is closed, the refrigerant passes through the water-cooled condenser 700 or the air condenser 403.

[0049] The first electronic expansion valve 404 and the second electronic expansion valve 405 both have two states: open and closed. When both the first electronic expansion valve 404 and the second electronic expansion valve 405 are open, the refrigerant passes through the evaporator 401 and the battery cooler 600, respectively. When one of the first electronic expansion valve 404 or the second electronic expansion valve 405 is open and the other is closed, the refrigerant passes through the evaporator 401 or the battery cooler 600.

[0050] In the embodiments provided in this application, the air conditioning thermal management circuit 400 is provided with a liquid storage and drying bottle 408, which is located on the pipeline between the water-cooled condenser 700 and the evaporator 401. The air conditioning thermal management circuit 400 is provided with a first coaxial tube 409 and a second coaxial tube 410. The first coaxial tube 409 is located on the pipeline between the water-cooled condenser 700 and the evaporator 401, and the second coaxial tube 410 is located on the pipeline between the evaporator 401 and the compressor 402. Temperature and pressure sensors 411 are provided at both the liquid inlet and the liquid outlet of the compressor 402.

[0051] After absorbing heat in the evaporator 401, the refrigerant vaporizes into a low-temperature, low-pressure gaseous refrigerant. The gaseous refrigerant is then compressed into a high-temperature, high-pressure refrigerant by the compressor 402 and enters the water-cooled condenser 700 and / or the air condenser 403 to release heat and become a high-pressure liquid refrigerant. After being regulated into a low-temperature, low-pressure refrigerant by the first electronic expansion valve 404 and / or the second electronic expansion valve 405, it re-enters the evaporator 401 and / or the battery cooler 600 to form a complete refrigeration cycle.

[0052] The inlet on the water side of the battery cooler 600 is connected to the seventh port 807 of the seven-way valve 800, and the outlet on the water side of the battery cooler 600 is connected to the second port 802 of the seven-way valve 800. The refrigerant delivered from the seventh port 807 of the seven-way valve 800 flows through the water side of the battery cooler 600 to the second port 802 of the seven-way valve 800.

[0053] Based on the above embodiments, the present invention enables the battery thermal management circuit 100, electric drive thermal management circuit 200, heating circuit 300, air conditioning thermal management circuit 400, plate heat exchanger 500, battery cooler 600 and water-cooled condenser 700 to be connected in series / parallel by setting a seven-way valve 800. The system has functions such as battery heating / cooling / waste heat utilization, electric drive cooling / waste heat utilization and battery / electric drive system filling and venting. It has comprehensive functions and has the advantages of fewer parts, lower cost and lower system complexity, which is conducive to integrated design and platform vehicle expansion.

[0054] This invention uses the heat from the heat pump system to heat the battery. At the same time, this mode can make the system operate stably in heat pump mode during dehumidification in spring and autumn, which can reduce the energy consumption of the vehicle during spring and autumn driving and battery charging and heating, and improve the vehicle's driving range.

[0055] Secondly, the present invention utilizes the aforementioned new energy vehicle thermal management system for thermal management, and the thermal management method includes the following thermal management modes:

[0056] First mode: The first port 801 of the seven-way valve 800 is closed, the second port 802 is connected to the fourth port 804, the third port 803 is connected to the fifth port 805, and the sixth port 806 is connected to the seventh port 807. The first electronic expansion valve 404 is open, the second electronic expansion valve 405 is open, the first shut-off valve 406 is open, and the second shut-off valve 407 is closed. In the first mode, it is used for cooling the passenger cabin and battery in summer. The battery thermal management circuit 100 and the electric drive thermal management circuit 200 work independently. The refrigerant is regulated to a low temperature and low pressure by the second electronic expansion valve 405 and then flows through the electric drive circuit. The refrigerant on the water side of the battery cooler 600 is cooled down. The refrigerant sent from the water side of the battery cooler 600 is sent to the second port 802 of the seven-way valve 800 and then flows into the fourth port 804 of the seven-way valve 800. After cooling the battery pack 101, it flows into the sixth port 806 of the seven-way valve 800 and then to the water side of the battery cooler 600 via the seventh port 807 of the seven-way valve 800 to complete the cycle. The on-board charger 202 and the drive motor 203 in the electric drive thermal management 200 circuit are cooled separately by the low-temperature radiator 201.

[0057] Second mode: The first port 801 of the seven-way valve 800 is closed, the second port 802 is connected to the fourth port 804, the third port 803 is connected to the fifth port 805, the sixth port 806 is connected to the seventh port 807, the first electronic expansion valve 404 is closed, the second electronic expansion valve 405 is closed, the first shut-off valve 406 is closed, and the second shut-off valve 407 is closed. When it is necessary to add venting or battery charging air cooling, the electronic water pump 1000 is turned on to inject the refrigerant in the first expansion tank 204 into the pipeline of the electric drive thermal management circuit 200, and then returns to the electric drive thermal management circuit 200 through the fifth port 805, the fourth port 804, the sixth port 806, the seventh port 807, the second port 802, and the third port 803 of the seven-way valve 800 in sequence.

[0058] Third mode: The first port 801 of the seven-way valve 800 is closed, the second port 802 is connected to the third port 803, the fourth port 804 is connected to the sixth port 806, and the fifth port 805 is connected to the seventh port 807. The first electronic expansion valve 404 is closed, the second electronic expansion valve 405 is open, the first shut-off valve 406 is closed, and the second shut-off valve 407 is open. The heat from the outside air enters the electric drive thermal management circuit 200 through the low-temperature radiator 201, and then enters the water side of the battery cooler 600 through the fifth port 805 and the seventh port 807 of the seven-way valve 800. This heats the refrigerant on the refrigerant side of the battery cooler 600. The heated refrigerant then transfers heat to the heating circuit 300 at the water-cooled condenser 700 for heating the crew compartment. The heat from the refrigerant in the heating circuit 300 can also be transferred to the battery thermal management circuit 100 in the plate heat exchanger 500 to heat the battery pack 101.

[0059] Fourth mode: The third port 803 of the seven-way valve 800 is closed, the first port 801 and the second port 802 are connected, the fourth port 804 and the sixth port 806 are connected, and the fifth port 805 and the seventh port 807 are connected. The first electronic expansion valve 404 is closed, the second electronic expansion valve 405 is open, the first shut-off valve 406 is closed, and the second shut-off valve 407 is open. In the electric drive thermal management circuit 200, the on-board charger 202 and the drive motor 203 generate heat. The high-temperature refrigerant enters from the fifth port 805 of the seven-way valve 800 and is sent out from the seventh port 807 to the water side of the battery cooler 600, raising the temperature of the refrigerant on the refrigerant side of the battery cooler 600. The heated refrigerant transfers heat to the heating circuit 300 at the water-cooled condenser 700 for heating the passenger compartment. The heat from the refrigerant in the heating circuit 300 can also be transferred to the battery thermal management circuit 100 in the plate heat exchanger 500 to heat the battery pack 101.

[0060] Mode 5: The third port 803 of the seven-way valve 800 is closed, the first port 801 and the second port 802 are connected, the fourth port 804 and the fifth port 805 are connected, the sixth port 806 and the seventh port 807 are connected, the first electronic expansion valve 404 is closed, the second electronic expansion valve 405 is open, the first shut-off valve 406 is closed, and the second shut-off valve 407 is open. When the battery pack 101 requires cooling and the passenger compartment requires heating / the water temperature of the battery pack 101 is low, the battery pack 101, the on-board charger 202 and the drive motor 203 generate heat. The higher-temperature refrigerant enters from the sixth port 806 of the seven-way valve 800 and is sent out from the seventh port 807 to the water side of the battery cooler 600, raising the temperature of the refrigerant on the refrigerant side of the battery cooler 600. The heated refrigerant transfers heat to the heating circuit 300 at the water-cooled condenser 700 for heating the passenger compartment.

[0061] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A thermal management system for new energy vehicles, characterized in that, It includes a battery thermal management circuit (100), an electric drive thermal management circuit (200), a heating circuit (300), an air conditioning thermal management circuit (400), a plate heat exchanger (500), a battery cooler (600), a water-cooled condenser (700), and a seven-way valve (800), wherein: The battery thermal management circuit (100) includes a battery pack (101), the inlet of the battery pack (101) is connected to the fourth port (804) of the seven-way valve (800), the outlet of the battery pack (101) is connected to the cold side of the plate heat exchanger (500), and the cold side of the plate heat exchanger (500) is connected to the sixth port (806) of the seven-way valve (800). The electric thermal management circuit (200) includes a low-temperature radiator (201), an on-board charger (202), and a drive motor (203) connected in sequence. The outlet of the drive motor (203) is connected to the fifth port (805) of the seven-way valve (800). The inlet of the low-temperature radiator (201) is connected to the third port (803) of the seven-way valve (800). The first port (801) of the seven-way valve (800) is connected to the pipeline between the low-temperature radiator (201) and the on-board charger (202). The heating circuit (300) includes a three-way valve (301) and a heating core (302). The first port (3011) of the three-way valve (301), the second port (3012) of the three-way valve (301), the heating core (302) and the water side of the water-cooled condenser (700) are connected in sequence to form a circulation circuit. The liquid inlet on the hot side of the plate heat exchanger (500) is connected to the third port (3013) of the three-way valve (301), and the liquid outlet on the hot side of the plate heat exchanger (500) is connected to the liquid inlet on the refrigerant side of the water-cooled condenser (700). The air conditioning thermal management circuit (400) includes an evaporator (401), a compressor (402), and an air condenser (403). The refrigerant sides of the evaporator (401), the compressor (402), and the water-cooled condenser (700) are sequentially connected to form a circulation loop. The liquid inlet of the evaporator (401) is equipped with a first electronic expansion valve (404). The battery cooler (600) is connected in parallel with the evaporator (401). The refrigerant inlet of the (600) is connected to the refrigerant outlet of the water-cooled condenser (700). The battery cooler (600) is equipped with a second electronic expansion valve (405) at its inlet. The air condenser (403) is connected in parallel with the water-cooled condenser (700). The air condenser (403) is equipped with a first shut-off valve (406) at its inlet. The water-cooled condenser (700) is equipped with a second shut-off valve (407) at its refrigerant inlet. The water inlet of the battery cooler (600) is connected to the seventh port (807) of the seven-way valve (800), and the water outlet of the battery cooler (600) is connected to the second port (802) of the seven-way valve (800).

2. The new energy vehicle thermal management system according to claim 1, characterized in that: The heating circuit (300) is equipped with a high-pressure PTC (303). The inlet of the high-pressure PTC (303) is connected to the outlet of the water-cooled condenser (700) on the water side. The outlet of the high-pressure PTC (303) is connected to the first port (3011) of the three-way valve (301).

3. The new energy vehicle thermal management system according to claim 1, characterized in that: It also includes a first expansion tank (204), which is connected to the electric thermal management circuit (200).

4. The new energy vehicle thermal management system according to claim 1, characterized in that: A second expansion tank (304) is also provided, which is connected to the heating circuit (300).

5. The new energy vehicle thermal management system according to claim 1, characterized in that: The air conditioning thermal management circuit (400) is equipped with a liquid storage drying bottle (408), which is located on the pipeline between the water-cooled condenser (700) and the evaporator (401).

6. The new energy vehicle thermal management system according to claim 5, characterized in that: The air conditioning thermal management circuit (400) is provided with a first coaxial tube (409) and a second coaxial tube (410). The first coaxial tube (409) is located on the pipeline between the water-cooled condenser (700) and the evaporator (401), and the second coaxial tube (410) is located on the pipeline between the evaporator (401) and the compressor (402).

7. The new energy vehicle thermal management system according to claim 1, characterized in that: The compressor (402) is equipped with temperature and pressure sensors (411) at both its inlet and outlet.

8. The new energy vehicle thermal management system according to claim 2, characterized in that: Temperature sensors (900) are provided at the liquid inlet of the low-temperature radiator (201), the liquid outlet of the low-temperature radiator (201), the liquid inlet of the battery pack (101), the liquid inlet of the on-board charger (202), the liquid outlet of the high-voltage PTC (303), and the liquid outlet of the evaporator (401).

9. The new energy vehicle thermal management system according to claim 1, characterized in that: An electronic water pump (1000) is provided on the pipe at the liquid inlet of the on-board charger (202), the liquid inlet of the water-cooled condenser (700), and the liquid inlet of the battery pack (101).

10. A thermal management method for new energy vehicles, characterized in that, Thermal management is performed using the thermal management system for new energy vehicles according to any one of claims 1-9, wherein the thermal management method includes the following thermal management modes: First mode: The first port (801) of the seven-way valve (800) is closed, the second port (802) is connected to the fourth port (804), the third port (803) is connected to the fifth port (805), the sixth port (806) is connected to the seventh port (807), the first electronic expansion valve (404) is open, the second electronic expansion valve (405) is open, the first shut-off valve (406) is open, and the second shut-off valve (407) is closed; Second mode: The first port (801) of the seven-way valve (800) is closed, the second port (802) is connected to the fourth port (804), the third port (803) is connected to the fifth port (805), the sixth port (806) is connected to the seventh port (807), the first electronic expansion valve (404) is closed, the second electronic expansion valve (405) is closed, the first shut-off valve (406) is closed, and the second shut-off valve (407) is closed; Third mode: The first port (801) of the seven-way valve (800) is closed, the second port (802) is connected to the third port (803), the fourth port (804) is connected to the sixth port (806), the fifth port (805) is connected to the seventh port (807), the first electronic expansion valve (404) is closed, the second electronic expansion valve (405) is open, the first shut-off valve (406) is closed, and the second shut-off valve (407) is open; Fourth mode: The third port (803) of the seven-way valve (800) is closed, the first port (801) is connected to the second port (802), the fourth port (804) is connected to the sixth port (806), the fifth port (805) is connected to the seventh port (807), the first electronic expansion valve (404) is closed, the second electronic expansion valve (405) is open, the first shut-off valve (406) is closed, and the second shut-off valve (407) is open; Mode 5: The third port (803) of the seven-way valve (800) is closed, the first port (801) is connected to the second port (802), the fourth port (804) is connected to the fifth port (805), the sixth port (806) is connected to the seventh port (807), the first electronic expansion valve (404) is closed, the second electronic expansion valve (405) is open, the first shut-off valve (406) is closed, and the second shut-off valve (407) is open.

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