New energy vehicle thermal management system, control method and vehicle

Abstract

The invention relates to a new energy automobile heat management system, a control method and a vehicle, the new energy automobile heat management system comprises a heat pump air conditioner loop and an air conditioner warm air core loop, and the heat pump air conditioner loop comprises an air conditioner compressor, a water cooling condenser, a first electronic expansion valve, a first gas-liquid separator and an outdoor heat exchanger which are sequentially communicated with one another; a gaseous refrigerant branch used for bypassing the outdoor heat exchanger is further connected between an exhaust port of the first gas-liquid separator and the air conditioner compressor. The air conditioner warm air core body loop exchanges heat with the water-cooling condenser, the air conditioner warm air core body loop comprises a circulating water pump and an air conditioner warm air core body which are communicated with each other, an inlet of the circulating water pump is communicated with an outlet of the water-cooling condenser, and an outlet of the air conditioner warm air core body is communicated with an inlet of the water-cooling condenser. The first gas-liquid separator generates and forms a pure liquid refrigerant and a full gas refrigerant. The pure liquid refrigerant completely enters the outdoor heat exchanger, the heat exchange efficiency of the outdoor heat exchanger and the outdoor temperature is improved through the pure liquid refrigerant, and the energy consumption of the whole vehicle heat management system is reduced by about 10%.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicle air conditioning, and in particular to a new energy vehicle thermal management system, a control method and a vehicle. Background Art

[0002] At present, the heat pump air-conditioning system of new energy vehicles includes a compressor, PTC, air-conditioning box, air-conditioning pipes, pressure and temperature sensors, outdoor temperature sensors, air-conditioning controllers, outdoor heat exchangers, chillers, gas-liquid separators, electronic expansion valves, solenoid valves and other components; the air-conditioning system can adopt cooling mode in summer, which is equivalent to the cooling mode of traditional air-conditioning to provide cold air to the passenger compartment to achieve a comfortable temperature for the human body; the heat pump air-conditioning system can use heat pump heating mode in winter to provide heat to the passenger compartment to achieve a comfortable temperature for the human body.

[0003] At present, the heating mode of the heat pump air-conditioning system of new energy vehicles is: the compressor works, discharges high-temperature and high-pressure gaseous refrigerant, transfers the heat of the refrigerant to the water side through the water-cooled condenser, and increases the temperature of the water inside the water-cooled condenser; after passing through the water-cooled condenser, the refrigerant becomes liquid high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant is expanded and throttled by the electronic expansion valve to become a low-temperature, low-pressure gas-liquid mixed refrigerant.

[0004] The low-temperature, low-pressure refrigerant absorbs heat from the air through the outdoor heat exchanger, thereby reducing the power consumption of the entire vehicle system and improving the heating capacity of the system. The low-temperature, low-pressure gas-liquid mixed refrigerant passes through the outdoor heat exchanger and becomes a low-temperature, low-pressure full-gaseous refrigerant and then returns to the air-conditioning compressor. The compressor compresses the low-temperature, low-pressure gaseous refrigerant and discharges the high-temperature, high-pressure gaseous refrigerant to participate in the next cycle.

[0005] The cooling water passing through the water-cooled condenser becomes cooling water with increased temperature. The water pump pumps the cooling water into the air conditioning heater core of the air conditioning box. The air conditioning box has a blower. The blower blows the low-temperature air through the air conditioning heater core. The high-temperature cooling water heats the low-temperature air and then blows it into the entire vehicle, thereby raising the temperature inside the vehicle and forming a heating process for the entire vehicle.

[0006] Currently, when a heat pump air-conditioning system is working, the refrigerant is expanded and throttled by the electronic expansion valve upstream of the outdoor heat exchanger, and then changes into a low-temperature, low-pressure gas-liquid mixed refrigerant that enters the outdoor heat exchanger to absorb heat from the outside air. However, the gaseous refrigerant is not easy to absorb heat from the outside air, resulting in low heat exchange efficiency of the outdoor heat exchanger, low COP value of the heat pump air-conditioning system, and high energy consumption of the entire vehicle. Summary of the Invention

[0007] The embodiments of the present application provide a new energy vehicle thermal management system, control method and vehicle to solve the problem in the current heat pump air-conditioning system in the related art that the gaseous refrigerant does not easily absorb the heat of the external air, resulting in low heat exchange efficiency of the outdoor heat exchanger and a low COP value of the heat pump air-conditioning system.

[0008] A first aspect of an embodiment of the present application provides a new energy vehicle thermal management system, comprising: A heat pump air conditioning circuit, comprising an air conditioning compressor, a water-cooled condenser, a first electronic expansion valve, a first gas-liquid separator, and an outdoor heat exchanger, which are interconnected in sequence. A gaseous refrigerant branch for bypassing the outdoor heat exchanger is further connected between the exhaust port of the first gas-liquid separator and the air conditioning compressor; An air conditioning heater core circuit, the air conditioning heater core circuit and the water-cooled condenser heat exchange, the air conditioning heater core circuit includes a circulating water pump and an air conditioning heater core that are interconnected, the inlet of the circulating water pump is connected to the outlet of the water-cooled condenser, and the outlet of the air conditioning heater core is connected to the inlet of the water-cooled condenser.

[0009] When the thermal management system of the new energy vehicle of this embodiment is in heating operation, the air-conditioning compressor works, discharges high-temperature and high-pressure gaseous refrigerant and transfers the heat of the refrigerant to the water side through the water-cooled condenser, thereby increasing the temperature of the water inside the water-cooled condenser; the high-temperature and high-pressure gaseous refrigerant becomes high-temperature and high-pressure liquid refrigerant after passing through the water-cooled condenser, and the high-temperature and high-pressure liquid refrigerant is expanded and throttled by the first electronic expansion valve to become a low-temperature and low-pressure gas-liquid two-phase refrigerant.

[0010] After the low-temperature and low-pressure gas-liquid refrigerant passes through the first gas-liquid separator, the pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger and becomes a low-temperature and low-pressure full gaseous refrigerant and then returns to the air-conditioning compressor. The full gaseous refrigerant separated by the first gas-liquid separator returns directly to the air-conditioning compressor through the gaseous refrigerant branch to participate in the next cycle.

[0011] The present application adds a first gas-liquid separator between the first electronic expansion valve and the outdoor heat exchanger. The first gas-liquid separator converts the low-temperature and low-pressure gas-liquid two-phase refrigerant discharged from the first electronic expansion valve into pure liquid refrigerant and full gas refrigerant through the first gas-liquid separator.

[0012] All the pure liquid refrigerant enters the outdoor heat exchanger. The pure liquid refrigerant improves the heat exchange efficiency between the outdoor heat exchanger and the outdoor temperature, and reduces energy consumption by about 10%. The pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger and becomes a low-temperature and low-pressure full-gaseous refrigerant and then returns to the air-conditioning compressor. The full-gaseous refrigerant discharged from the first gas-liquid separator passes through the gaseous refrigerant branch and directly returns to the air-conditioning compressor to participate in the next cycle.

[0013] In some embodiments, the outdoor heat exchanger includes a first interface located at the top of the outdoor heat exchanger and a second interface located at the bottom of the outdoor heat exchanger, the first interface is connected to a first two-position three-way reversing valve, and the second interface is connected to a second two-position three-way reversing valve; When the heat pump air conditioning circuit is in heating operation mode, the first two-position three-way reversing valve and the second two-position three-way reversing valve control the liquid refrigerant discharged from the first gas-liquid separator to enter through the second interface of the outdoor heat exchanger and be discharged from the first interface; When the heat pump air conditioning circuit is in cooling mode, the first two-position three-way reversing valve and the second two-position three-way reversing valve control the gaseous refrigerant discharged from the air conditioning compressor to enter the first interface of the outdoor heat exchanger and be discharged from the second interface.

[0014] In some embodiments, the refrigerant outlet of the water-cooled condenser is provided with a first refrigerant branch and a second refrigerant branch, the first refrigerant branch is connected to the inlet of the first gas-liquid separator, and the first electronic expansion valve is located on the first refrigerant branch; The second refrigerant branch is communicated with the first interface at the top of the outdoor heat exchanger, and a third solenoid valve is provided on the second refrigerant branch.

[0015] In some embodiments, a second solenoid valve connected to the outdoor heat exchanger is provided at the drain port of the first gas-liquid separator, and a one-way valve branch is provided between the inlet of the first gas-liquid separator and the outdoor heat exchanger to bypass the first gas-liquid separator and the second solenoid valve; A one-way valve is provided on the one-way valve branch to allow the refrigerant to flow from the outdoor heat exchanger into the inlet of the first gas-liquid separator. A second electronic expansion valve and an indoor evaporator are connected between the discharge port of the first gas-liquid separator and the inlet of the air-conditioning compressor.

[0016] In some embodiments: a third electronic expansion valve is provided on the gaseous refrigerant branch.

[0017] In some embodiments: a first circulation branch for connecting to the air-conditioning compressor is provided downstream of the third electronic expansion valve, and the first circulation branch is sequentially connected to a first solenoid valve, a temperature and pressure sensor, and a second gas-liquid separator; The first solenoid valve is located upstream of the temperature and pressure sensor and the second gas-liquid separator, and a second circulation branch for communicating with the first solenoid valve is provided downstream of the outdoor heat exchanger.

[0018] In some embodiments: the water side of the water-cooled condenser is connected to an engine cooling circulation loop and / or a battery pack cooling circulation loop.

[0019] In some embodiments: a fourth solenoid valve is provided on the water side of the water-cooled condenser for opening or closing the engine cooling circulation loop and / or the battery pack cooling circulation loop.

[0020] A second aspect of the present application provides a method for controlling a thermal management system of a new energy vehicle, the method using the thermal management system of the new energy vehicle described in any of the above embodiments, the method comprising the following steps: When the new energy vehicle thermal management system is in heating mode, the first electronic expansion valve is opened, the air conditioning compressor works, discharges high-temperature and high-pressure gaseous refrigerant, and transfers the heat of the refrigerant to the water side through the water-cooled condenser, thereby increasing the temperature of the water inside the water-cooled condenser; The high-temperature and high-pressure gaseous refrigerant passes through the water-cooled condenser and becomes a high-temperature and high-pressure liquid refrigerant. The high-temperature and high-pressure liquid refrigerant is expanded and throttled by the first electronic expansion valve and becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant. After the low-temperature and low-pressure gas-liquid refrigerant passes through the first gas-liquid separator, the pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger and becomes a low-temperature and low-pressure full gaseous refrigerant and then returns to the air-conditioning compressor. The full gaseous refrigerant separated by the first gas-liquid separator returns directly to the air-conditioning compressor through the gaseous refrigerant branch to participate in the next cycle.

[0021] In some embodiments: the method further comprises: the cooling water passing through the water-cooled condenser exchanges heat with the high-temperature and high-pressure gaseous refrigerant to increase its temperature, and the cooling water is pumped to the air conditioning heater core by a circulating water pump; The air conditioning heater core is equipped with a blower, which blows the air in the cockpit through the air conditioning heater core. The cooling water in the air conditioning heater core exchanges heat with the air, thereby increasing the air temperature in the cockpit.

[0022] In some embodiments, a third electronic expansion valve is provided on the gaseous refrigerant branch, a first circulation branch for connecting to the air-conditioning compressor is provided downstream of the third electronic expansion valve, and a first solenoid valve, a temperature and pressure sensor, and a second gas-liquid separator are sequentially connected to the first circulation branch; The method also includes opening the third electronic expansion valve, which adjusts its own opening according to the refrigerant temperature information and pressure information detected by the temperature and pressure sensor, and the refrigerant flowing through the second gas-liquid separator is sent to the air-conditioning compressor after gas-liquid diversion.

[0023] In some embodiments, the outdoor heat exchanger includes a first interface located at the top of the outdoor heat exchanger and a second interface located at the bottom of the outdoor heat exchanger, the first interface is connected to a first two-position three-way reversing valve, and the second interface is connected to a second two-position three-way reversing valve; The first two-position three-way reversing valve and the second two-position three-way reversing valve control the liquid refrigerant discharged from the first gas-liquid separator to enter the second interface of the outdoor heat exchanger and be discharged from the first interface.

[0024] In some embodiments, a second solenoid valve connected to the outdoor heat exchanger is provided at the drain port of the first gas-liquid separator, and a one-way valve branch is provided between the inlet of the first gas-liquid separator and the outdoor heat exchanger to bypass the first gas-liquid separator and the second solenoid valve; A one-way valve is provided on the one-way valve branch to allow the refrigerant to flow from the outdoor heat exchanger into the inlet of the first gas-liquid separator. A second electronic expansion valve and an indoor evaporator are connected between the drain port of the first gas-liquid separator and the inlet of the air-conditioning compressor. When the new energy vehicle thermal management system is in a cooling working mode, the first electronic expansion valve, the second solenoid valve and the third electronic expansion valve are closed, and the air-conditioning compressor, the third solenoid valve and the second electronic expansion valve are opened to start working; The air conditioner compressor absorbs low-temperature, low-pressure refrigerant and compresses it, then discharges high-temperature, high-pressure gaseous refrigerant. After passing through the water-cooled condenser, it flows into the outdoor heat exchanger. The outdoor heat exchanger exchanges heat with the outside air and releases the heat to the outside, thus forming high-temperature, high-pressure liquid refrigerant. The high-temperature, high-pressure liquid refrigerant passes through the one-way valve and enters the first gas-liquid separator. It then enters the second electronic expansion valve for expansion and throttling, forming a low-temperature, low-pressure gas-liquid refrigerant that flows into the indoor evaporator. The indoor evaporator is equipped with a blower that blows the air in the cockpit through the indoor evaporator. The air in the cockpit is cooled after the air exchanges heat with the low-temperature, low-pressure gas-liquid refrigerant in the indoor evaporator. The low-temperature, low-pressure gas-liquid refrigerant passes through the indoor evaporator and forms a low-temperature, low-pressure gas refrigerant, which enters the air-conditioning compressor and participates in the next refrigerant cycle.

[0025] In some embodiments, the outdoor heat exchanger includes a first interface located at the top of the outdoor heat exchanger and a second interface located at the bottom of the outdoor heat exchanger, the first interface is connected to a first two-position three-way reversing valve, and the second interface is connected to a second two-position three-way reversing valve; The first two-position three-way reversing valve and the second two-position three-way reversing valve control the gaseous refrigerant discharged from the air-conditioning compressor to enter the first interface of the outdoor heat exchanger and be discharged from the second interface.

[0026] A third aspect of an embodiment of the present application provides a vehicle, which includes the new energy vehicle thermal management system described in any of the above embodiments.

[0027] The beneficial effects of the technical solution provided by this application include: An embodiment of the present application provides a new energy vehicle thermal management system, a control method and a vehicle. Since the new energy vehicle thermal management system of the present application is provided with a heat pump air-conditioning circuit and an air-conditioning warm air core circuit, the heat pump air-conditioning circuit includes an air-conditioning compressor, a water-cooled condenser, a first electronic expansion valve, a first gas-liquid separator and an outdoor heat exchanger which are interconnected in sequence, and a gaseous refrigerant branch for bypassing the outdoor heat exchanger is also connected between the exhaust port of the first gas-liquid separator and the air-conditioning compressor; the air-conditioning warm air core circuit exchanges heat with the water-cooled condenser, and the air-conditioning warm air core circuit includes a circulating water pump and an air-conditioning warm air core which are interconnected, the inlet of the circulating water pump is connected to the outlet of the water-cooled condenser, and the outlet of the air-conditioning warm air core is connected to the inlet of the water-cooled condenser.

[0028] Therefore, when the new energy vehicle thermal management system of the present application is in heating operation, the air-conditioning compressor works, discharges high-temperature and high-pressure gaseous refrigerant and transfers the heat of the refrigerant to the water side through the water-cooled condenser, thereby increasing the temperature of the water inside the water-cooled condenser; the high-temperature and high-pressure gaseous refrigerant becomes high-temperature and high-pressure liquid refrigerant after passing through the water-cooled condenser, and the high-temperature and high-pressure liquid refrigerant is expanded and throttled by the first electronic expansion valve to become a low-temperature and low-pressure gas-liquid two-phase refrigerant; after the low-temperature and low-pressure gas-liquid two-phase refrigerant passes through the first gas-liquid separator, the pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger and becomes a low-temperature and low-pressure full gaseous refrigerant and then returns to the air-conditioning compressor, and the full gaseous refrigerant separated by the first gas-liquid separator directly returns to the air-conditioning compressor through the gaseous refrigerant branch to participate in the next cycle.

[0029] This application adds a first gas-liquid separator between the first electronic expansion valve and the outdoor heat exchanger. The first gas-liquid separator converts the low-temperature, low-pressure gas-liquid refrigerant discharged from the first electronic expansion valve into pure liquid refrigerant and fully gaseous refrigerant through the first gas-liquid separator. The pure liquid refrigerant enters the outdoor heat exchanger, which improves the heat exchange efficiency between the outdoor heat exchanger and the outdoor temperature, reducing energy consumption by approximately 10%. The pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger and becomes a low-temperature, low-pressure fully gaseous refrigerant, which then returns to the air-conditioning compressor. The fully gaseous refrigerant discharged from the first gas-liquid separator returns directly to the air-conditioning compressor through the gaseous refrigerant branch to participate in the next cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 This is a schematic structural diagram of an embodiment of the present application.

[0032] Reference numerals: 1. Air conditioning compressor; 2. Water-cooled condenser; 3. First electronic expansion valve; 4. First gas-liquid separator; 5. Outdoor heat exchanger; 6. Gaseous refrigerant branch; 7. Circulating water pump; 8. Air conditioning heater core; 9. First refrigerant branch; 10. Second refrigerant branch; 11. Third solenoid valve; 12. Second solenoid valve; 13. One-way valve branch; 14. One-way valve; 15. Second electronic expansion valve; 16. Indoor evaporator; 17. Third electronic expansion valve; 18. First circulation branch; 19. First solenoid valve; 20. Temperature and pressure sensor; 21. Second gas-liquid separator; 22. Second circulation branch. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The embodiments of the present application provide a new energy vehicle thermal management system, control method and vehicle, which can solve the problem in the current heat pump air-conditioning system in the related art that the gaseous refrigerant is not easy to absorb the heat of the outside air, resulting in low heat exchange efficiency of the outdoor heat exchanger and low COP value of the heat pump air-conditioning system.

[0035] See also Figure 1 As shown, the first aspect of the embodiment of the present application provides a new energy vehicle thermal management system, including: A heat pump air-conditioning circuit includes an air-conditioning compressor 1, a water-cooled condenser 2, a first electronic expansion valve 3, a first gas-liquid separator 4 and an outdoor heat exchanger 5 which are interconnected in sequence. A gaseous refrigerant branch 6 for bypassing the outdoor heat exchanger 5 is also connected between the exhaust port of the first gas-liquid separator 4 and the air-conditioning compressor 1.

[0036] When the heat pump air conditioning circuit is working in heating mode, the air conditioning compressor 1 works to compress the refrigerant, discharges the high-temperature and high-pressure gaseous refrigerant, and transfers the heat of the refrigerant to the water side through the water-cooled condenser 2, thereby increasing the temperature of the water inside the water-cooled condenser 2.

[0037] The high-temperature and high-pressure gaseous refrigerant becomes a high-temperature and high-pressure liquid refrigerant after passing through the water-cooled condenser 2. The high-temperature and high-pressure liquid refrigerant is expanded and throttled through the first electronic expansion valve 3 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant.

[0038] After the low-temperature and low-pressure gas-liquid two-phase refrigerant passes through the first gas-liquid separator 4, the pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger 5 and becomes a low-temperature and low-pressure full-gas refrigerant and then returns to the air-conditioning compressor 1. The full-gas refrigerant separated by the first gas-liquid separator 4 passes through the gaseous refrigerant branch 6 and directly returns to the air-conditioning compressor 1 to participate in the next cycle.

[0039] The air conditioning warm air core circuit exchanges heat with the water-cooled condenser 2. The air conditioning warm air core circuit includes a circulating water pump 7 and an air conditioning warm air core 8 that are connected to each other. The inlet of the circulating water pump 7 is connected to the outlet on the water side of the water-cooled condenser 2, and the outlet of the air conditioning warm air core 8 is connected to the inlet on the water side of the water-cooled condenser.

[0040] The cooling water in the air conditioning heater core 8 is pumped into the water side of the water-cooled condenser 2 through the circulating water pump 7, and exchanges heat with the high-temperature and high-pressure gaseous refrigerant in the medium side of the water-cooled condenser 2. The high-temperature and high-pressure gaseous refrigerant heats the cooling water in the air conditioning heater core 8 and then realizes warm air heating under the action of the blower.

[0041] When the new energy vehicle thermal management system of the present application is in heating operation, the air conditioning compressor 1 works, discharges high-temperature and high-pressure gaseous refrigerant and transfers the heat of the refrigerant to the water side through the water-cooled condenser 2, thereby increasing the temperature of the water inside the water-cooled condenser 2; The high-temperature and high-pressure gaseous refrigerant becomes a high-temperature and high-pressure liquid refrigerant after passing through the water-cooled condenser 2. The high-temperature and high-pressure liquid refrigerant is expanded and throttled through the first electronic expansion valve 3 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant.

[0042] After the low-temperature and low-pressure gas-liquid two-phase refrigerant passes through the first gas-liquid separator 4, the pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger 5 and becomes a low-temperature and low-pressure full-gas refrigerant and then returns to the air-conditioning compressor 1. The full-gas refrigerant separated by the first gas-liquid separator 4 passes through the gaseous refrigerant branch 6 and directly returns to the air-conditioning compressor 1 to participate in the next cycle.

[0043] This application adds a first gas-liquid separator 4 between the first electronic expansion valve 3 and the outdoor heat exchanger 5. The first gas-liquid separator 4 converts the low-temperature and low-pressure gas-liquid two-phase refrigerant discharged from the first electronic expansion valve 3 into pure liquid refrigerant and full gaseous refrigerant through the first gas-liquid separator 4.

[0044] All the pure liquid refrigerant enters the outdoor heat exchanger 5. The pure liquid refrigerant improves the heat exchange efficiency between the outdoor heat exchanger 5 and the outdoor air temperature, and reduces energy consumption by about 10%. The pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger 5 and becomes a low-temperature and low-pressure full-gaseous refrigerant and then returns to the air-conditioning compressor 1. The full-gaseous refrigerant discharged from the first gas-liquid separator 4 passes through the gaseous refrigerant branch 6 and directly returns to the air-conditioning compressor 1 to participate in the next working cycle.

[0045] In some optional embodiments, referring to Figure 1 As shown in the drawings, the embodiments of the present application provide a new energy vehicle thermal management system, and the outdoor heat exchanger 5 of the new energy vehicle thermal management system comprises a first interface (not shown in the drawings) located at the top of the outdoor heat exchanger 5 and a second interface (not shown in the drawings) located at the bottom of the outdoor heat exchanger 5. The first interface is connected with a first two-position three-way directional valve (not shown in the drawings), and the second interface is connected with a second two-position three-way directional valve (not shown in the drawings).

[0046] When the heat pump air conditioning circuit is in a heating working condition, the first two-position three-way directional valve and the second two-position three-way directional valve control the liquid refrigerant discharged from the first gas-liquid separator 4 to enter from the second interface of the outdoor heat exchanger 5 and to be discharged from the first interface. After the liquid refrigerant enters from the second interface at the bottom of the outdoor heat exchanger 5, the liquid refrigerant is discharged from the first interface at the top of the outdoor heat exchanger 5 after filling the outdoor heat exchanger 5, so that the liquid refrigerant is discharged after being fully heat exchanged with outdoor air in the outdoor heat exchanger 5, thereby improving the heat exchange rate of the liquid refrigerant.

[0047] When the heat pump air conditioning circuit is in a cooling working condition, the first two-position three-way directional valve and the second two-position three-way directional valve control the gaseous refrigerant discharged from the air conditioning compressor 1 to enter from the first interface of the outdoor heat exchanger 5 and to be discharged from the second interface. After the gaseous refrigerant enters from the first interface at the top of the outdoor heat exchanger 5, the gaseous refrigerant is discharged from the second interface at the bottom of the outdoor heat exchanger 5 after filling the outdoor heat exchanger 5, so that the gaseous refrigerant is discharged after being fully heat exchanged with outdoor air in the outdoor heat exchanger 5, thereby improving the heat exchange rate of the gaseous refrigerant.

[0048] According to the working condition of the heat pump air conditioning circuit, the first two-position three-way directional valve and the second two-position three-way directional valve can switch the first interface and the second interface of the outdoor heat exchanger 5 and change the flow direction of the refrigerant entering the outdoor heat exchanger 5 in the embodiments of the present application.

[0049] When the heat pump air conditioning circuit is in a heating working condition, the refrigerant entering the outdoor heat exchanger 5 is liquid refrigerant, and the liquid refrigerant has a large density compared with air, so that the liquid refrigerant is controlled to enter from the second interface at the bottom of the outdoor heat exchanger 5 and to be discharged from the first interface at the top of the outdoor heat exchanger 5 after being fully heat exchanged in the outdoor heat exchanger 5.

[0050] When the heat pump air conditioning circuit is in a cooling working condition, the refrigerant entering the outdoor heat exchanger 5 is gaseous refrigerant, and the gaseous refrigerant has a small density compared with air, so that the gaseous refrigerant is controlled to enter from the first interface at the top of the outdoor heat exchanger 5 and to be discharged from the second interface at the bottom of the outdoor heat exchanger 5 after being fully heat exchanged in the outdoor heat exchanger 5.

[0051] In some optional embodiments, referring to Figure 1As shown, an embodiment of the present application provides a new energy vehicle thermal management system, in which the refrigerant outlet of the water-cooled condenser 2 of the new energy vehicle thermal management system is provided with a first refrigerant branch 9 and a second refrigerant branch 10, the first refrigerant branch 9 is connected to the inlet of the first gas-liquid separator 4, and the first electronic expansion valve 3 is located on the first refrigerant branch 9.

[0052] A second refrigerant branch 10 is connected to the first interface at the top of the outdoor heat exchanger 5 and is provided with a third solenoid valve 11. A second solenoid valve 12 connected to the outdoor heat exchanger 5 is provided at the drain port of the first gas-liquid separator 4. A one-way valve branch 13 is provided between the inlet of the first gas-liquid separator 4 and the outdoor heat exchanger 5, bypassing the first gas-liquid separator 4 and the second solenoid valve 12.

[0053] A one-way valve 14 is provided on the one-way valve branch 13 to allow the refrigerant to flow from the outdoor heat exchanger 5 into the inlet of the first gas-liquid separator 4. A second electronic expansion valve 15 and an indoor evaporator 16 are connected between the discharge port of the first gas-liquid separator 4 and the inlet of the air-conditioning compressor 1.

[0054] In the embodiment of the present application, when the heat pump air-conditioning circuit is in the cooling state, the first electronic expansion valve 3, the second solenoid valve 12 and the third electronic expansion valve 17 are closed, and the air-conditioning compressor 1, the third solenoid valve 11 and the second electronic expansion valve 15 are opened to start working.

[0055] After the air-conditioning compressor 1 absorbs low-temperature, low-pressure refrigerant and compresses it, it discharges high-temperature, high-pressure gaseous refrigerant, which flows through the water-cooled condenser 2 (the water-cooled condenser 2 does not participate in heat exchange) and then flows into the outdoor heat exchanger 5. The outdoor heat exchanger 5 exchanges heat with the outside air and releases the heat to the outside, thereby forming a high-temperature and high-pressure liquid refrigerant.

[0056] The high-temperature, high-pressure liquid refrigerant passes through the one-way valve 14 and enters the first gas-liquid separator 4, and then enters the second electronic expansion valve 15 for expansion and throttling, forming a low-temperature, low-pressure gas-liquid two-state refrigerant that flows into the indoor evaporator 16. The indoor evaporator 16 is equipped with a blower, which blows the air in the cockpit through the indoor evaporator 16.

[0057] After the air in the cockpit exchanges heat with the low-temperature, low-pressure gas-liquid refrigerant in the indoor evaporator 16, the air in the cockpit is cooled. After the low-temperature, low-pressure gas-liquid refrigerant passes through the indoor evaporator 16 for heat exchange, it forms a low-temperature, low-pressure gas refrigerant and enters the air-conditioning compressor 1 to participate in the next refrigerant circulation.

[0058] In some alternative embodiments: See Figure 1As shown, the embodiment of the present application provides a new energy vehicle thermal management system, in which a third electronic expansion valve 17 is provided on the gaseous refrigerant branch 6 of the new energy vehicle thermal management system. A first circulation branch 18 for connecting to the air conditioning compressor 1 is provided downstream of the third electronic expansion valve 17. The first circulation branch 18 is sequentially connected to a first solenoid valve 19, a temperature and pressure sensor 20, and a second gas-liquid separator 21.

[0059] The first solenoid valve 19 is located upstream of the temperature and pressure sensor 20 and the second gas-liquid separator 21. A second circulation branch 22, connecting to the first solenoid valve 19, is provided downstream of the outdoor heat exchanger 5. The water side of the water-cooled condenser 2 is connected to the engine cooling circuit (not shown) and / or the battery pack cooling circuit (not shown). A fourth solenoid valve (not shown) is also provided on the water side of the water-cooled condenser 2 to open or close the engine cooling circuit and / or the battery pack cooling circuit.

[0060] In the embodiment of the present application, a third electronic expansion valve 17 is provided on the gaseous refrigerant branch 6. The third electronic expansion valve 17 adjusts its own opening and the power of the air-conditioning compressor 1 according to the temperature and pressure sensor 20 detecting the temperature and pressure of the low-temperature, low-pressure gaseous refrigerant entering the air-conditioning compressor 1, thereby controlling the temperature value of the air-conditioning heater core 8.

[0061] When the heat pump air conditioning circuit is in the heating condition, the first solenoid valve 19 is opened, and the low-temperature, low-pressure gaseous refrigerant discharged from the outdoor heat exchanger 5 and the low-temperature, low-pressure gaseous refrigerant discharged from the third electronic expansion valve 17 merge with the first solenoid valve 19 and enter the temperature and pressure sensor 20 and the second gas-liquid separator 21 in turn for gas pressure separation. The pure gaseous refrigerant then enters the air conditioning compressor 1 for the next cycle.

[0062] When the heat pump air-conditioning circuit is in the cooling condition, the first solenoid valve 19, the third electronic expansion valve 17 and the second solenoid valve 12 are all in the closed state, and the high-temperature, high-pressure gaseous refrigerant discharged from the air-conditioning compressor 1 flows into the water-cooled condenser 2, the third solenoid valve 11, the second refrigerant branch 10, the outdoor heat exchanger 5, the one-way valve 14, the first gas-liquid separator 4, the second electronic expansion valve 15, the indoor evaporator 16 in sequence and then flows back to the air-conditioning compressor 1.

[0063] See also Figure 1 As shown, the second aspect of the embodiment of the present application provides a control method for a new energy vehicle thermal management system, which uses the new energy vehicle thermal management system described in any of the above embodiments, and the method includes the following steps: Step 101: When the thermal management system of the new energy vehicle is in the heating working mode, the first electronic expansion valve 3 is opened, the air-conditioning compressor 1 works, discharges the high-temperature and high-pressure gaseous refrigerant and transfers the heat of the refrigerant to the water side through the water-cooled condenser 2, thereby increasing the temperature of the water inside the water-cooled condenser 2.

[0064] Step 102: The high-temperature and high-pressure gaseous refrigerant passes through the water-cooled condenser 2 and becomes a high-temperature and high-pressure liquid refrigerant. The high-temperature and high-pressure liquid refrigerant is expanded and throttled by the first electronic expansion valve 3 and becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant.

[0065] Step 103: The low-temperature and low-pressure gas-liquid refrigerant passes through the first gas-liquid separator 4 for gas-liquid separation. The pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger 5 and becomes a low-temperature and low-pressure full gaseous refrigerant, and then returns to the air-conditioning compressor 1. The full gaseous refrigerant separated by the first gas-liquid separator 4 passes through the gaseous refrigerant branch 6 and directly returns to the air-conditioning compressor 1 to participate in the next cycle.

[0066] Step 104 , the cooling water in the water-cooled condenser 2 exchanges heat with the high-temperature and high-pressure gaseous refrigerant, and its temperature is increased. The circulating water pump 7 pumps the cooling water to the air conditioning heater core 8 .

[0067] Step 105: The air conditioning heater core 8 is equipped with a blower. The blower blows the air in the cockpit through the air conditioning heater core 8. The cooling water in the air conditioning heater core 8 exchanges heat with the air, thereby increasing the air temperature in the cockpit.

[0068] See also Figure 1 As shown, an embodiment of the present application provides a control method for a thermal management system of a new energy vehicle. In the control method, a third electronic expansion valve 17 is provided on the gaseous refrigerant branch 6, and a first circulation branch 18 for connecting to the air-conditioning compressor 1 is provided downstream of the third electronic expansion valve 17. The first solenoid valve 19, the temperature and pressure sensor 20 and the second gas-liquid separator 21 are connected in sequence to the first circulation branch 18.

[0069] The control method also includes opening the third electronic expansion valve 17, which adjusts its own opening according to the refrigerant temperature information and pressure information detected by the temperature and pressure sensor 20, and the refrigerant flowing through the second gas-liquid separator 21 is sent to the air-conditioning compressor 1 after gas-liquid diversion.

[0070] See also Figure 1 As shown, an embodiment of the present application provides a control method for a thermal management system of a new energy vehicle. In the control method, the outdoor heat exchanger 5 includes a first interface located at the top of the outdoor heat exchanger 5, and a second interface located at the bottom of the outdoor heat exchanger. The first interface is connected to a first two-position three-way reversing valve, and the second interface is connected to a second two-position three-way reversing valve.

[0071] The first two-position three-way reversing valve and the second two-position three-way reversing valve control the liquid refrigerant discharged from the first gas-liquid separator 4 to enter the second port of the outdoor heat exchanger 5 and be discharged from the first port. When the heat pump air conditioning circuit is in the heating mode, the refrigerant entering the outdoor heat exchanger 5 is liquid refrigerant, which has a greater density than air. Therefore, the liquid refrigerant is controlled to enter from the second port at the bottom of the outdoor heat exchanger 5, undergo sufficient heat exchange in the outdoor heat exchanger 5, and then be discharged from the first port at the top of the outdoor heat exchanger 5.

[0072] See also Figure 1 As shown, an embodiment of the present application provides a control method for a thermal management system of a new energy vehicle, in which the drain port of the first gas-liquid separator 4 is provided with a second solenoid valve 12 connected to the outdoor heat exchanger 5, and a one-way valve branch 13 is provided between the inlet of the first gas-liquid separator 4 and the outdoor heat exchanger 5 to bypass the first gas-liquid separator 4 and the second solenoid valve 12.

[0073] A one-way valve 14 is provided on the one-way valve branch 13 to allow the refrigerant to flow from the outdoor heat exchanger 5 into the inlet of the first gas-liquid separator 4. A second electronic expansion valve 15 and an indoor evaporator 16 are connected between the discharge port of the first gas-liquid separator 4 and the inlet of the air-conditioning compressor 1.

[0074] When the new energy vehicle thermal management system is in cooling mode: Step 201 : Close the first electronic expansion valve 3 , the second solenoid valve 12 , the first solenoid valve 19 and the third electronic expansion valve 17 , and open the air-conditioning compressor 1 , the third solenoid valve 11 and the second electronic expansion valve 15 to start working.

[0075] Step 202: The air-conditioning compressor 1 absorbs low-temperature, low-pressure refrigerant, compresses it, and then discharges high-temperature, high-pressure gaseous refrigerant. The gaseous refrigerant passes through the water-cooled condenser 2 (the water-cooled condenser 2 does not participate in heat exchange) and then flows into the outdoor heat exchanger 5. The outdoor heat exchanger 5 exchanges heat with the outside air and releases the heat to the outside, thereby forming a high-temperature, high-pressure liquid refrigerant.

[0076] Step 203, the high-temperature, high-pressure liquid refrigerant passes through the one-way valve 14 and enters the first gas-liquid separator 4, and then enters the second electronic expansion valve 15 for expansion and throttling, forming a low-temperature, low-pressure gas-liquid two-state refrigerant that flows into the indoor evaporator 16. The indoor evaporator 16 is equipped with a blower, which blows the air in the cockpit through the indoor evaporator 16.

[0077] Step 204: After the air in the cockpit exchanges heat with the low-temperature, low-pressure gas-liquid refrigerant in the indoor evaporator 16, the air in the cockpit is cooled. After the low-temperature, low-pressure gas-liquid refrigerant passes through the indoor evaporator 16 for heat exchange, it forms a low-temperature, low-pressure gas refrigerant and enters the air-conditioning compressor 1 to participate in the next refrigerant circulation.

[0078] See also Figure 1 As shown, an embodiment of the present application provides a control method for a thermal management system of a new energy vehicle. In the control method, the outdoor heat exchanger 5 includes a first interface located at the top of the outdoor heat exchanger 5, and a second interface located at the bottom of the outdoor heat exchanger. The first interface is connected to a first two-position three-way reversing valve, and the second interface is connected to a second two-position three-way reversing valve.

[0079] The first two-position three-way reversing valve and the second two-position three-way reversing valve control the gaseous refrigerant discharged from the air-conditioning compressor 1 to enter the first port of the outdoor heat exchanger 5 and be discharged from the second port. When the heat pump air-conditioning circuit is in cooling mode, the refrigerant entering the outdoor heat exchanger 5 is gaseous refrigerant, which has a lower density than air. Therefore, the gaseous refrigerant is controlled to enter from the first port at the top of the outdoor heat exchanger 5, undergo sufficient heat exchange in the outdoor heat exchanger 5, and be discharged from the second port at the bottom of the outdoor heat exchanger 5.

[0080] A third aspect of an embodiment of the present application provides a vehicle, which includes the new energy vehicle thermal management system described in any of the above embodiments.

[0081] How it works An embodiment of the present application provides a new energy vehicle thermal management system, a control method and a vehicle. Since the new energy vehicle thermal management system of the present application is provided with a heat pump air-conditioning circuit and an air-conditioning warm air core circuit, the heat pump air-conditioning circuit includes an air-conditioning compressor 1, a water-cooled condenser 2, a first electronic expansion valve 3, a first gas-liquid separator 4 and an outdoor heat exchanger 5 which are interconnected in sequence.

[0082] A gaseous refrigerant branch 6 for bypassing the outdoor heat exchanger 5 is also connected between the exhaust port of the first gas-liquid separator 4 and the air-conditioning compressor 1; the air-conditioning warm air core circuit exchanges heat with the water-cooled condenser, and the air-conditioning warm air core circuit includes a circulating water pump 7 and an air-conditioning warm air core 8 that are interconnected. The inlet of the circulating water pump 7 is connected to the outlet of the water-cooled condenser 2, and the outlet of the air-conditioning warm air core 8 is connected to the inlet of the water-cooled condenser 2.

[0083] Therefore, when the new energy vehicle thermal management system of the present application is in heating operation, the air-conditioning compressor 1 works, discharges high-temperature and high-pressure gaseous refrigerant and transfers the heat of the refrigerant to the water side through the water-cooled condenser 2, thereby increasing the temperature of the water inside the water-cooled condenser 2; the high-temperature and high-pressure gaseous refrigerant becomes high-temperature and high-pressure liquid refrigerant after passing through the water-cooled condenser 2, and the high-temperature and high-pressure liquid refrigerant is expanded and throttled through the first electronic expansion valve 3 to become a low-temperature and low-pressure gas-liquid two-phase refrigerant.

[0084] After the low-temperature and low-pressure gas-liquid two-phase refrigerant passes through the first gas-liquid separator 4, the pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger 5 and becomes a low-temperature and low-pressure full-gas refrigerant and then returns to the air-conditioning compressor 1. The full-gas refrigerant separated by the first gas-liquid separator 4 passes through the gaseous refrigerant branch 6 and directly returns to the air-conditioning compressor 1 to participate in the next cycle.

[0085] This application adds a first gas-liquid separator 4 between the first electronic expansion valve 3 and the outdoor heat exchanger 5. The first gas-liquid separator 4 converts the low-temperature and low-pressure gas-liquid two-phase refrigerant discharged from the first electronic expansion valve 3 into pure liquid refrigerant and full gaseous refrigerant through the first gas-liquid separator 4.

[0086] All the pure liquid refrigerant enters the outdoor heat exchanger 5. The pure liquid refrigerant improves the heat exchange efficiency between the outdoor heat exchanger 5 and the outdoor temperature, and reduces energy consumption by about 10%. The pure liquid refrigerant absorbs heat from the air through the outdoor heat exchanger 5 and becomes a low-temperature and low-pressure full-gaseous refrigerant and then returns to the air-conditioning compressor 1. The full-gaseous refrigerant discharged from the first gas-liquid separator 4 passes through the gaseous refrigerant branch 6 and directly returns to the air-conditioning compressor 1 to participate in the next cycle.

[0087] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0088] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0089] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A new energy vehicle thermal management system, characterized in that: include: A heat pump air conditioning circuit, the heat pump air conditioning circuit comprising an air conditioning compressor (1), a water-cooled condenser (2), a first electronic expansion valve (3), a first gas-liquid separator (4), and an outdoor heat exchanger (5) which are interconnected in sequence, and a gaseous refrigerant branch (6) for bypassing the outdoor heat exchanger (5) is further connected between the exhaust port of the first gas-liquid separator (4) and the air conditioning compressor (1); An air conditioning warm air core circuit, wherein the air conditioning warm air core circuit exchanges heat with the water-cooled condenser (2), and the air conditioning warm air core circuit comprises a circulating water pump (7) and an air conditioning warm air core (8) that are interconnected, wherein the inlet of the circulating water pump (7) is connected to the outlet of the water-cooled condenser (2), and the outlet of the air conditioning warm air core (8) is connected to the inlet of the water-cooled condenser (2).

2. A new energy vehicle thermal management system according to claim 1, characterized in that: The outdoor heat exchanger (5) comprises a first interface located at the top of the outdoor heat exchanger (5), and a second interface located at the bottom of the outdoor heat exchanger (5), the first interface being connected to a first two-position three-way reversing valve, and the second interface being connected to a second two-position three-way reversing valve; When the heat pump air conditioning circuit is in heating operation mode, the first two-position three-way reversing valve and the second two-position three-way reversing valve control the liquid refrigerant discharged from the first gas-liquid separator (4) to enter through the second interface of the outdoor heat exchanger (5) and be discharged from the first interface; When the heat pump air conditioning circuit is in cooling operation, the first two-position three-way reversing valve and the second two-position three-way reversing valve control the gaseous refrigerant discharged from the air conditioning compressor (1) to enter through the first interface of the outdoor heat exchanger (5) and be discharged from the second interface.

3. A new energy vehicle thermal management system according to claim 2, characterized in that: The refrigerant outlet of the water-cooled condenser (2) is provided with a first refrigerant branch (9) and a second refrigerant branch (10), the first refrigerant branch (9) is connected to the inlet of the first gas-liquid separator (4), and the first electronic expansion valve (3) is located on the first refrigerant branch (9); The second refrigerant branch (10) is in communication with the first interface at the top of the outdoor heat exchanger (5), and a third solenoid valve (11) is provided on the second refrigerant branch (10).

4. A new energy vehicle thermal management system according to claim 1, characterized in that: The drain port of the first gas-liquid separator (4) is provided with a second solenoid valve (12) connected to the outdoor heat exchanger (5), and a one-way valve branch (13) for bypassing the first gas-liquid separator (4) and the second solenoid valve (12) is provided between the inlet of the first gas-liquid separator (4) and the outdoor heat exchanger (5); The one-way valve branch (13) is provided with a one-way valve (14) for allowing the refrigerant to flow from the outdoor heat exchanger (5) into the inlet of the first gas-liquid separator (4), and a second electronic expansion valve (15) and an indoor evaporator (16) are connected between the discharge port of the first gas-liquid separator (4) and the inlet of the air-conditioning compressor (1).

5. The new energy vehicle thermal management system according to claim 1, characterized in that: A third electronic expansion valve (17) is provided on the gaseous refrigerant branch (6).

6. A new energy vehicle thermal management system according to claim 5, characterized in that: A first circulation branch (18) for communicating with the air-conditioning compressor (1) is provided downstream of the third electronic expansion valve (17); the first circulation branch (18) is sequentially connected to a first solenoid valve (19), a temperature and pressure sensor (20), and a second gas-liquid separator (21); The first solenoid valve (19) is located upstream of the temperature and pressure sensor (20) and the second gas-liquid separator (21), and a second circulation branch (22) for communicating with the first solenoid valve (19) is provided downstream of the outdoor heat exchanger (5).

7. The new energy vehicle thermal management system according to claim 1, characterized in that: The water side of the water-cooled condenser (2) is connected to an engine cooling circulation loop and / or a battery pack cooling circulation loop.

8. A new energy vehicle thermal management system according to claim 7, characterized in that: The water side of the water-cooled condenser (2) is provided with a fourth solenoid valve for opening or closing the engine cooling circulation loop and / or the battery pack cooling circulation loop.

9. A control method for a thermal management system of a new energy vehicle, characterized in that: The method uses the new energy vehicle thermal management system according to any one of claims 1 to 8, and the method comprises the following steps: When the new energy vehicle thermal management system is in a heating working mode, the first electronic expansion valve (3) is opened, the air conditioning compressor (1) works, discharges high-temperature and high-pressure gaseous refrigerant, and transfers the heat of the refrigerant to the water side through the water-cooled condenser (2), thereby increasing the temperature of the water inside the water-cooled condenser (2); The high-temperature and high-pressure gaseous refrigerant passes through the water-cooled condenser (2) and becomes a high-temperature and high-pressure liquid refrigerant. The high-temperature and high-pressure liquid refrigerant passes through the first electronic expansion valve (3) and undergoes expansion and throttling to become a low-temperature and low-pressure gas-liquid two-phase refrigerant. After the low-temperature and low-pressure gas-liquid refrigerant passes through the first gas-liquid separator (4), the pure liquid refrigerant passes through the outdoor heat exchanger (5) to absorb heat from the air and becomes a low-temperature and low-pressure full gas refrigerant and then returns to the air-conditioning compressor (1). The full gas refrigerant separated by the first gas-liquid separator (4) passes through the gas refrigerant branch (6) and directly returns to the air-conditioning compressor (1) to participate in the next cycle.

10. The control method of a new energy vehicle thermal management system according to claim 9, characterized in that: The method further comprises: the cooling water passing through the water-cooled condenser (2) exchanges heat with the high-temperature and high-pressure gaseous refrigerant to increase its temperature, and the circulating water pump (7) pumps the cooling water to the air conditioning heater core (8); The air conditioning heater core (8) is equipped with a blower, which blows the air in the cockpit through the air conditioning heater core (8), and the cooling water in the air conditioning heater core (8) exchanges heat with the air, thereby increasing the air temperature in the cockpit.

11. The control method of a new energy vehicle thermal management system according to claim 9, characterized in that: A third electronic expansion valve (17) is provided on the gaseous refrigerant branch (6); a first circulation branch (18) for connecting to the air-conditioning compressor (1) is provided downstream of the third electronic expansion valve (17); the first circulation branch (18) is connected in sequence to a first solenoid valve (19), a temperature and pressure sensor (20), and a second gas-liquid separator (21); The method further includes opening the third electronic expansion valve (17), wherein the third electronic expansion valve (17) adjusts its own opening according to the refrigerant temperature information and pressure information detected by the temperature and pressure sensor (20), and the refrigerant flowing through the second gas-liquid separator (21) is separated into gas and liquid, and the gaseous refrigerant is sent to the air-conditioning compressor (1).

12. The control method of a new energy vehicle thermal management system according to claim 9, characterized in that: The outdoor heat exchanger (5) comprises a first interface located at the top of the outdoor heat exchanger (5), and a second interface located at the bottom of the outdoor heat exchanger (5), the first interface being connected to a first two-position three-way reversing valve, and the second interface being connected to a second two-position three-way reversing valve; The first two-position three-way reversing valve and the second two-position three-way reversing valve control the liquid refrigerant discharged from the first gas-liquid separator (4) to enter through the second interface of the outdoor heat exchanger (5) and be discharged from the first interface.

13. The control method of a new energy vehicle thermal management system according to claim 9, characterized in that: The drain port of the first gas-liquid separator (4) is provided with a second solenoid valve (12) connected to the outdoor heat exchanger (5), and a one-way valve branch (13) for bypassing the first gas-liquid separator (4) and the second solenoid valve (12) is provided between the inlet of the first gas-liquid separator (4) and the outdoor heat exchanger (5); The one-way valve branch (13) is provided with a one-way valve (14) for allowing the refrigerant to flow from the outdoor heat exchanger (5) into the inlet of the first gas-liquid separator (4); a second electronic expansion valve (15) and an indoor evaporator (16) are connected between the discharge port of the first gas-liquid separator (4) and the inlet of the air-conditioning compressor (1); When the new energy vehicle thermal management system is in a cooling working mode, the first electronic expansion valve (3), the second solenoid valve (12) and the third electronic expansion valve (17) are closed, and the air-conditioning compressor (1), the third solenoid valve (11) and the second electronic expansion valve (15) are opened to start working; The air-conditioning compressor (1) sucks in low-temperature, low-pressure refrigerant and compresses it, then discharges high-temperature, high-pressure gaseous refrigerant, which flows through the water-cooled condenser (2) and then into the outdoor heat exchanger (5). The outdoor heat exchanger (5) exchanges heat with the outside air and releases the heat to the outside, thereby forming a high-temperature, high-pressure liquid refrigerant. The high-temperature, high-pressure liquid refrigerant passes through the one-way valve (14) and enters the first gas-liquid separator (4), and then enters the second electronic expansion valve (15) for expansion and throttling, forming a low-temperature, low-pressure gas-liquid two-state refrigerant that flows into the indoor evaporator (16). The indoor evaporator (16) is equipped with a blower, and the blower blows the air in the cockpit through the indoor evaporator (16); After the air in the cockpit exchanges heat with the low-temperature, low-pressure gas-liquid refrigerant in the indoor evaporator (16), the air in the cockpit is cooled. After the low-temperature, low-pressure gas-liquid refrigerant passes through the indoor evaporator (16) and exchanges heat, it forms a low-temperature, low-pressure gas refrigerant and enters the air-conditioning compressor (1) to participate in the next refrigerant cycle.

14. The control method of a new energy vehicle thermal management system according to claim 13, characterized in that: The outdoor heat exchanger (5) comprises a first interface located at the top of the outdoor heat exchanger (5), and a second interface located at the bottom of the outdoor heat exchanger (5), the first interface being connected to a first two-position three-way reversing valve, and the second interface being connected to a second two-position three-way reversing valve; The first two-position three-way reversing valve and the second two-position three-way reversing valve control the gaseous refrigerant discharged from the air-conditioning compressor (1) to enter the first interface of the outdoor heat exchanger (5) and be discharged from the second interface.

15. A vehicle, characterized in that: The vehicle includes the new energy vehicle thermal management system according to any one of claims 1 to 8.

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