Refrigerant loop, thermal management system, control method and vehicle

Abstract

The invention discloses a refrigerant loop, a heat management system, a control method and a vehicle, and belongs to the field of vehicles. Comprising a compressor, a refrigerator assembly, an air conditioner evaporator and a battery cooler. The refrigerator assembly comprises a refrigerator evaporator, and the refrigerator evaporator, the air conditioner evaporator and the battery cooler are all connected to the compressor and are arranged in parallel. In the application, a compressor of a refrigerator system in the vehicle can be omitted, and refrigeration of the air conditioning system and refrigeration of the refrigerator system of the vehicle can be realized only through one compressor, so that the cost of the vehicle can be effectively reduced.

Description

Technical Field

[0001] This application belongs to the field of vehicles, and particularly relates to a refrigerant circuit, a thermal management system, a control method, and a vehicle. Background Art

[0002] With the development of technology, vehicles have become an indispensable means of transportation for people's daily travel, and thus the requirements for vehicle comfort are getting higher and higher. Generally, in order to improve vehicle comfort, an air-conditioning system and a refrigerator system are provided in the vehicle. The air-conditioning system has a first compressor, and the refrigerator system has a second compressor. Through the first compressor, the air-conditioning system can heat or cool the interior of the vehicle, and through the second compressor, the refrigerator system can refrigerate, so that the items placed in the refrigerator system can be refrigerated. However, such a setting will increase the cost of the vehicle. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a refrigerant circuit, a thermal management system, a control method, and a vehicle, which can at least solve the problem of increasing the cost of the vehicle.

[0004] In a first aspect, the embodiments of this application provide a refrigerant circuit, including: a compressor, a refrigerator assembly, an air-conditioning evaporator, and a battery cooler;

[0005] The refrigerator assembly includes a refrigerator evaporator, and the refrigerator evaporator, the air-conditioning evaporator, and the battery cooler are all connected to the compressor, and the refrigerator evaporator, the air-conditioning evaporator, and the battery cooler are arranged in parallel.

[0006] Optionally, the refrigerator assembly further includes a cold storage cavity, a phase change refrigerant is arranged in the cold storage cavity, the refrigerator evaporator is located in the cold storage cavity, and the refrigerator evaporator is in contact with the phase change refrigerant.

[0007] Optionally, the refrigerator assembly further includes a first cavity and a second cavity, the cold storage cavity is located in the first cavity, and there is a gap between the cold storage cavity and the second cavity, a refrigeration component is arranged in the gap, the refrigeration component is respectively connected to the cold storage cavity and the second cavity, a refrigeration fan is arranged in the first cavity, a air duct is arranged in the second cavity, the refrigeration fan faces the air duct, and the gap is communicated with the air duct and the interior of the second cavity.

[0008] Optionally, the refrigeration component includes a thermoelectric cooler, the thermoelectric cooler has opposite first and second ends, the first end is connected to the cold storage cavity, and the second end is connected to the second cavity.

[0009] Optionally, the refrigeration assembly further includes a first heat exchange fin assembly, which is located between the semiconductor refrigeration element and the second cavity. One end of the first heat exchange fin assembly is connected to the semiconductor refrigeration element, and the other end of the first heat exchange fin assembly is connected to the second cavity, so that the semiconductor refrigeration element is connected to the second cavity through the first heat exchange fin assembly.

[0010] Optionally, the refrigeration assembly further includes a second heat exchange fin assembly, which is spaced apart from the first heat exchange fin assembly in the gap. One end of the second heat exchange fin assembly is connected to the second cavity, and the other end of the second heat exchange fin assembly is connected to the cold storage cavity.

[0011] Optionally, a heat conduction plate is provided on the outer wall of the cold storage cavity facing the second cavity, and the refrigeration assembly is connected to the heat conduction plate.

[0012] Optionally, the refrigerant circuit further includes a first switching valve;

[0013] One end of the first switching valve is connected to the compressor, and the other end of the first switching valve is respectively connected to the air conditioner evaporator, the refrigerator evaporator, and the battery cooler.

[0014] Optionally, the refrigerant circuit further includes a first expansion valve;

[0015] One end of the first expansion valve is connected to the other end of the first switching valve, and the other end of the first expansion valve is connected to the air conditioner evaporator, so that the other end of the first switching valve is connected to the air conditioner evaporator through the first expansion valve.

[0016] Optionally, the refrigerant circuit further includes a second expansion valve;

[0017] One end of the second expansion valve is connected to the other end of the first switching valve, and the other end of the second expansion valve is connected to the refrigerator evaporator, so that the other end of the first switching valve is connected to the refrigerator evaporator through the second expansion valve.

[0018] Optionally, the refrigerant circuit further includes a third expansion valve;

[0019] One end of the third expansion valve is connected to the other end of the first switching valve, and the other end of the third expansion valve is connected to the battery cooler, so that the other end of the first switching valve is connected to the battery cooler through the third expansion valve.

[0020] Optionally, the refrigerant circuit further includes a water-cooled condenser, an outdoor heat exchanger, a gas-liquid separator, a second switching valve, and a third switching valve;

[0021] The water-cooled condenser is connected to one end of the first switching valve, so that one end of the first switching valve is connected to the compressor through the water condenser. The gas-liquid separator has an input end and an output end. The outdoor heat exchanger is connected to the water-cooled condenser. The outdoor heat exchanger is respectively connected to the air-conditioning evaporator, the refrigerator evaporator and the battery cooler through the third switching valve, and the outdoor heat exchanger is connected to the input end of the gas-liquid separator through the second switching valve. The air-conditioning evaporator, the refrigerator evaporator and the battery cooler are all connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected to the compressor.

[0022] Optionally, the refrigerant circuit further includes a fourth expansion valve;

[0023] The outdoor heat exchanger is connected to the water-cooled condenser through the fourth expansion valve.

[0024] In a second aspect, an embodiment of the present application provides a thermal management system, which includes a coolant circuit and the refrigerant circuit according to any one of the first aspects above;

[0025] The refrigerant circuit is coupled to the coolant circuit.

[0026] In a third aspect, an embodiment of the present application provides a control method, which is applied to the thermal management system described in the second aspect above. The refrigerant circuit includes a first expansion valve, a second expansion valve, a third expansion valve, a fourth expansion valve, a first switching valve, a second switching valve, a third switching valve, a water-cooled condenser, an outdoor heat exchanger, and a gas-liquid separator. The control method includes:

[0027] Determine the working mode of the thermal management system;

[0028] Based on the working mode of the thermal management system, control the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switching valve, the second switching valve, and the third switching valve to switch between the open state and the closed state.

[0029] Optionally, the controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switching valve, the second switching valve, and the third switching valve to switch between the open state and the closed state based on the working mode of the thermal management system includes:

[0030] When the thermal management system is in the air-conditioning refrigeration, the refrigerator component is working and the battery is cooled mode, control the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, and the third switching valve to be in the open state, and control the first switching valve and the second switching valve to be in the closed state.

[0031] Optionally, based on the operating mode of the thermal management system, controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switching valve, the second switching valve, and the third switching valve to switch between an open state and a closed state includes:

[0032] When the thermal management system is in a mode where the air conditioner is off, the refrigerator assembly is operating, and the battery stops refrigerating, control the second expansion valve, the fourth expansion valve, and the third switching valve to be in an open state, and control the first expansion valve, the third expansion valve, the first switching valve, and the second switching valve to be in a closed state.

[0033] Optionally, based on the operating mode of the thermal management system, controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switching valve, the second switching valve, and the third switching valve to switch between an open state and a closed state includes:

[0034] When the thermal management system is in a mode where the refrigerator assembly is operating, the battery is refrigerating, and the air conditioner is heating, control the first expansion valve and the third switching valve to be in a closed state, and control the second expansion valve, the third expansion valve, the fourth expansion valve, the first switching valve, and the second switching valve to be in an open state.

[0035] Optionally, based on the operating mode of the thermal management system, controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switching valve, the second switching valve, and the third switching valve to switch between an open state and a closed state includes:

[0036] When the thermal management system is in a low-temperature environment and the refrigerator assembly is operating, control the second expansion valve and the first switching valve to be in an open state, and control the first expansion valve, the third expansion valve, the second switching valve, the third switching valve, and the fourth expansion valve to be in an open state.

[0037] Optionally, the control method further includes: determining whether the refrigerator assembly is in a defrosting mode;

[0038] When the refrigerator assembly is in a defrosting mode, switch the current direction of the semiconductor refrigeration element so that the current direction in the semiconductor refrigeration element is different from the initial current direction in the semiconductor refrigeration element, and the end of the semiconductor refrigeration element facing the first heat exchange fin assembly is the hot end, and the end of the semiconductor refrigeration element facing the cold storage cavity is the cold end.

[0039] In a fourth aspect, an embodiment of the present application provides a vehicle, which includes the thermal management system described in the second aspect above.

[0040] In the embodiment of the present application, by setting that the refrigerator evaporator, the air conditioner evaporator and the battery cooler are all connected to the compressor, and the refrigerator evaporator, the air conditioner evaporator and the battery cooler are arranged in parallel, it is equivalent to that the air conditioning system and the refrigerator system of the vehicle share the same compressor. Thus, the compressor of the refrigerator system in the vehicle can be cancelled, and only one compressor can be used to realize the refrigeration of the air conditioning system and the refrigeration of the refrigerator system of the vehicle, thereby effectively reducing the cost of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the refrigerant circuit when showing a mode in which the air conditioner refrigerates, the refrigerator assembly works and the battery refrigerates provided by the embodiment of the present application;

[0042] Figure 2 A schematic diagram of the refrigerant circuit showing a mode in which the air conditioner is turned off, the refrigerator assembly works and the battery stops refrigerating provided by the embodiment of the present application;

[0043] Figure 3 A schematic diagram of the refrigerant circuit when showing a mode in which the refrigerator assembly works, the battery refrigerates and the air conditioner heats provided by the embodiment of the present application;

[0044] Figure 4 A schematic diagram of the refrigerant circuit showing a mode in which the refrigerator assembly works provided by the embodiment of the present application;

[0045] Figure 5 One of the schematic diagrams of the refrigerator assembly provided by the embodiment of the present application;

[0046] Figure 6 Another schematic diagram of the refrigerator assembly provided by the embodiment of the present application;

[0047] Figure 7 A flowchart of a control method provided by the embodiment of the present application.

[0048] Reference numerals:

[0049] 001: Phase change refrigerant; 002: Thermal conductive adhesive; 10: Compressor; 20: Refrigerator assembly; 21: Cold storage chamber; 22: Refrigerator evaporator; 23: First cavity; 24: Second cavity; 25: Refrigeration component; 26: Refrigeration fan; 211: Heat conducting plate; 241: Air duct; 251: Thermoelectric cooling element; 252: First heat exchange fin assembly; 253: Second heat exchange fin assembly; 30: Air conditioner evaporator; 31: First evaporator; 32: Second evaporator; 40: Battery cooler; 50: First switching valve; 60: First expansion valve; 61: First valve; 62: Second valve; 70: Second expansion valve; 80: Third expansion valve; 90: Water-cooled condenser; 100: Outdoor heat exchanger; 110: Gas-liquid separator; 120: Second switching valve; 130: Third switching valve; 140: Fourth expansion valve. Detailed implementation manners

[0050] The features of the terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0051] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0052] In the description of this application, it should be noted that unless otherwise clearly specified and defined, 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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 specific situations.

[0053] As Figures 1 to 6 shown, the refrigerant circuit includes: a compressor 10, a refrigerator assembly 20, an air conditioner evaporator 30, and a battery cooler 40.

[0054] The refrigerator assembly 20 includes a refrigerator evaporator 22. The refrigerator evaporator 22, an air conditioner evaporator 30, and a battery cooler 40 are all connected to a compressor 10, and the refrigerator evaporator 22, the air conditioner evaporator 30, and the battery cooler 40 are arranged in parallel.

[0055] In the embodiment of the present application, by arranging that the refrigerator evaporator 22, the air conditioner evaporator 30, and the battery cooler 40 are all connected to the compressor 10, and the refrigerator evaporator 22, the air conditioner evaporator 30, and the battery cooler 40 are arranged in parallel, it is equivalent to the air conditioner system and the refrigerator system of the vehicle sharing the same compressor 10. Thus, the compressor 10 of the refrigerator system in the vehicle can be cancelled, and only through one compressor 10, the refrigeration of the air conditioner system and the refrigerator system of the vehicle can be realized, thereby effectively reducing the cost of the vehicle.

[0056] It should be noted that, in the embodiment of the present application, the air conditioner evaporator 30 may include a first evaporator 31 and a second evaporator 32, and the first evaporator 31 and the second evaporator 32 are arranged in parallel. In practical applications, the first evaporator 31 can be arranged at the head of the passenger compartment of the vehicle, and the second evaporator 32 can be arranged at the tail of the passenger compartment, so as to cool the head and the tail of the passenger compartment of the vehicle through the first evaporator 31 and the second evaporator 32. Among them, the head of the passenger compartment is close to the front of the vehicle, and the tail of the passenger compartment is close to the rear of the vehicle.

[0057] In addition, in some embodiments, the refrigerator assembly 20 may further include a cold storage chamber 21. A phase change refrigerant 001 is arranged in the cold storage chamber 21. The refrigerator evaporator 22 is located in the cold storage chamber 21, and the refrigerator evaporator 22 is in contact with the phase change refrigerant 001. Through such an arrangement, once the refrigerator evaporator 22 cools down, the refrigerator evaporator 22 can cause the phase change refrigerant 001 to undergo a phase change, so that the phase change refrigerant 001 can store cold energy, facilitating the continuous refrigeration of the refrigerator assembly 20.

[0058] It should be noted that, in the embodiment of the present application, the phase change refrigerant 001 may submerge the refrigerator evaporator 22. Of course, the refrigerator evaporator 22 may also partially extend out of the phase change refrigerant 001, as long as the refrigerator evaporator 22 is in contact with the phase change refrigerant 001.

[0059] In addition, in the embodiments of the present application, the displacement of the compressor 10 is relatively large, resulting in a mismatch between the refrigerant required by the compressor 10 and the refrigerator assembly 20, and there is a large gap between the displacement of the compressor 10 and the demand of the compressor 10. By providing the cold storage chamber 21, it is necessary to keep the phase change refrigerant 001 in the cold storage chamber 21 at a relatively low temperature, so that the refrigerator assembly 20 requires more cooling capacity, and then the demand of the refrigerator assembly 20 can be better matched with the displacement of the compressor 10, and further ensure better refrigeration of the refrigerator assembly 20.

[0060] In addition, in some embodiments, the refrigerator assembly 20 further includes a first chamber 23 and a second chamber 24. The first chamber 23 and the second chamber 24 are arranged in parallel. The cold storage chamber 21 is located in the first chamber 23, and there is a gap between the cold storage chamber 21 and the second chamber 24. A refrigeration component 25 is arranged in the gap. The refrigeration component 25 is respectively connected to the cold storage chamber 21 and the second chamber 24. A refrigeration fan 26 is arranged in the first chamber 23, and an air duct 241 is arranged in the second chamber 24. The refrigeration fan 26 faces the air duct 241, and the gap communicates with the inside of the air duct 241 and the second chamber 24.

[0061] Since there is a gap between the cold storage chamber 21 and the second chamber 24, and a refrigeration component 25 is arranged in the gap, therefore, the phase change refrigerant 001 in the cold storage chamber 21 can undergo a phase change through the refrigerator evaporator 22, that is, the liquid phase change refrigerant 001 can be changed into a solid phase change refrigerant 001, so that the overall temperature of the cold storage chamber 21 is reduced, and the temperature in the first chamber 23 is reduced. The refrigeration component 25 is respectively connected to the cold storage chamber 21 and the second chamber 24, so that the temperature of the refrigeration component 25 can be reduced through the cold storage chamber 21. Since a refrigeration fan 26 is arranged in the first chamber 23 and an air duct 241 is arranged in the second chamber 24, and the refrigeration fan 26 faces the air duct 241, and the gap communicates with the inside of the air duct 241 and the second chamber 24, therefore, when the refrigeration fan 26 works, the air blown out by the refrigeration fan 26 can flow through the second chamber 24, then flow out of the second chamber 24, and flow through the refrigeration component 25, and the refrigeration component 25 can be refrigerated by the cold storage chamber 21, so that the air flowing through the refrigeration component 25 can be cooled by the refrigeration component 25 to form cool air, and the cool air will flow into the second chamber 24 as the refrigeration fan 26 works, so that the temperature in the second chamber 24 is reduced, and further the items accommodated in the second chamber 24 are in a relatively low temperature environment, which helps the items to be stored for a long time. That is, by providing the refrigeration component 25 and the refrigeration fan 26, it is convenient to cool the second chamber 24, so that the second chamber 24 can store items for a long time.

[0062] It should be noted that in the embodiments of the present application, the phase change refrigerant 001 in the cold storage cavity 21 can occupy 85% of the volume of the cold storage cavity 21, that is, the cold storage cavity 21 is not fully filled with the phase change refrigerant 001. Of course, the phase change refrigerant 001 in the cold storage cavity 21 can also occupy other ratios of the volume of the cold storage cavity 21. For example, the phase change refrigerant 001 in the cold storage cavity 21 occupies 90% of the volume of the cold storage cavity, and for another example, the phase change refrigerant 001 in the cold storage cavity 21 occupies 80% of the volume of the cold storage cavity. In this regard, the embodiments of the present application do not make any limitations here.

[0063] In addition, in some embodiments, the refrigeration component 25 includes a thermoelectric cooler 251. The thermoelectric cooler 251 has opposite first and second ends. The first end is connected to the cold storage cavity 21, and the second end is connected to the second cavity 24.

[0064] Since the first end is connected to the cold storage cavity 21 and the second end is connected to the second cavity 24, therefore, the thermoelectric cooler 251 can also play a role in transferring heat, thereby transferring the lower temperature of the cold storage cavity 21 to the second cavity 24, so that the temperature of the second cavity 24 is reduced. That is, by setting the thermoelectric cooler 251, it is further convenient to reduce the temperature of the second cavity 24.

[0065] It should be noted that the thermoelectric cooler 251 has a cold end and a hot end. That is, by passing different currents through the thermoelectric cooler 251, the positions of the cold end and the hot end of the thermoelectric cooler 251 can be interchanged. For example, when a first current is passed through the thermoelectric cooler 251, the first end becomes the hot end and the second end becomes the cold end, so that the thermoelectric cooler 251 can transfer cold to the second cavity 24, which helps to reduce the temperature of the second cavity 24; for another example, when a second current is passed through the thermoelectric cooler 251, the first end becomes the cold end and the second end becomes the hot end.

[0066] In addition, in some embodiments, the refrigeration component 25 further includes a first heat exchange fin assembly 252. The first heat exchange fin assembly 252 is located between the thermoelectric cooler 251 and the second cavity 24, and one end of the first heat exchange fin assembly 252 is connected to the thermoelectric cooler 251, and the other end of the first heat exchange fin assembly 252 is connected to the second cavity 24, so that the thermoelectric cooler 251 is connected to the second cavity 24 through the first heat exchange fin assembly 252.

[0067] Since one end of the first heat exchange fin assembly 252 is connected to the semiconductor refrigeration component 251 and the other end of the first heat exchange fin assembly 252 is connected to the second cavity 24, the second end of the semiconductor refrigeration component 251 can be made the cold end. Thus, the semiconductor refrigeration component 251 can transfer the cold quantity to the first heat exchange fin assembly 252, making the temperature of the first heat exchange fin assembly 252 relatively low. The first heat exchange fin assembly 252 is located between the cold storage cavity 21 and the second cavity 24, and the air flowing out of the second cavity 24 will flow through the first heat exchange fin assembly 252. When the air flows through the first heat exchange fin assembly 252, the air can be cooled, and the air can exchange heat with the first heat exchange fin assembly 252 relatively sufficiently, effectively reducing the temperature of the air flowing back into the second cavity 24, and further effectively reducing the temperature of the second cavity 24. That is, by providing the first heat exchange fin assembly 252, it is helpful to reduce the temperature of the second cavity 24.

[0068] It should be noted that the first heat exchange fin assembly 252 may include a plurality of heat exchange fins. In addition, the first end of the semiconductor refrigeration component 251 may be connected to the cold storage cavity 21 through a heat-conducting adhesive 002, and the heat-conducting adhesive 002 may be a solid heat-conducting adhesive 002. The second end of the semiconductor refrigeration component 251 may be connected to the first heat exchange fin assembly 252 through the heat-conducting adhesive 002.

[0069] In addition, in some embodiments, the refrigeration assembly 25 further includes a second heat exchange fin assembly 253. The second heat exchange fin assembly 253 and the first heat exchange fin assembly 252 are distributed at intervals in the gap. One end of the second heat exchange fin assembly 253 is connected to the second cavity 24, and the other end of the second heat exchange fin assembly 253 is connected to the cold storage cavity 21.

[0070] Since the second heat exchange fin assembly 253 and the first heat exchange fin assembly 252 are distributed at intervals in the gap, one end of the second heat exchange fin assembly 253 is connected to the second cavity 24, and the other end of the second heat exchange fin assembly 253 is connected to the cold storage cavity 21, the second heat exchange fin assembly 253 can also play a role in heat conduction, transferring the cold quantity of the cold storage cavity 21 to the second cavity 24, and the air flowing out of the second cavity 24 will flow through the second heat exchange fin assembly 253. Thus, the second heat exchange fin assembly 253 further increases the heat exchange area on the basis of the first heat exchange fin assembly 252, enabling the temperature of the air flowing through the first heat exchange fin assembly 252 and the second heat exchange fin assembly 253 to be further reduced, and then enabling the air with a lower temperature to flow into the second cavity 24 to cool the second cavity 24. That is, by providing the second heat exchange fin assembly 253, it is further helpful to reduce the temperature of the second cavity 24.

[0071] It should be noted that the second heat exchange fin assembly 253 may include a plurality of heat exchange fins.

[0072] In addition, when the refrigeration assembly 25 includes a first heat exchange fin assembly 252 and a second heat exchange fin assembly 253, when the refrigerator assembly 20 needs to be refrigerated, the refrigerator evaporator 22 can quickly refrigerate the phase change refrigerant 001. At this time, the refrigerator evaporator 22 is connected in parallel with the air conditioner evaporator 30, and the evaporation temperatures of the two are the same. Generally, the evaporation temperature is in the range of 0-10°C, so that the temperature at which the cold storage cavity 21 undergoes a phase change is also 0-10°C, that is, the temperature of the cold storage cavity 21 is 0-10°C. The operation of the refrigeration fan 26 causes the air flowing out of the second cavity 24 to flow through the second heat exchange fin assembly 253, so that the second heat exchange fin assembly 253 cools the air, reducing the temperature of the air flowing into the second cavity 24 and achieving rapid cooling of the refrigerator assembly 20. As the refrigeration time extends, when the temperature in the second cavity 24 drops below 10°C, an electric current can be applied to the thermoelectric cooler 251, causing the thermoelectric cooler 251 to start operating. Through the thermoelectric cooler 251, the temperature in the second cavity 24 can be further reduced to achieve a lower temperature in the second cavity 24. For example, the temperature in the second cavity 24 can be made to reach 0-15°C.

[0073] In addition, in the embodiments of the present application, the second cavity 24 can also be defrosted by the thermoelectric cooler 251. Specifically, after frosting occurs in the second cavity 24, the current applied to the thermoelectric cooler 251 can be changed so that the second end of the thermoelectric cooler 251 is the hot end and the first end is the cold end, thereby increasing the temperature of the first heat exchange fin assembly 252. Then, when the air flowing out of the second cavity 24 flows through the first heat exchange fin assembly 252, the temperature of the air is increased, and the air with an increased temperature flows into the second cavity 24, removing the frost in the second cavity 24, which is equivalent to defrosting the second cavity 24.

[0074] In addition, in some embodiments, a heat conducting plate 211 is provided on the outer wall of the cold storage cavity 21 facing the second cavity 24, and the refrigeration assembly 25 is connected to the heat conducting plate 211.

[0075] With such a setting, once the temperature of the cold storage cavity 21 changes, the heat conducting plate 211 can quickly transfer the heat of the cold storage cavity 21 to the refrigeration assembly 25, enabling the refrigeration assembly 25 to respond quickly. That is, by providing the heat conducting plate 211, it is convenient for the temperature of the cold storage cavity 21 to be transferred to the refrigeration assembly 25.

[0076] It should be noted that the material of the heat conducting plate 211 can be a metal material. Of course, the material of the heat conducting plate 211 can also be other materials that can quickly transfer heat. The specific material of the heat conducting plate 211 is not limited in the embodiments of the present application.

[0077] In addition, in the embodiments of the present application, the material of the cold storage chamber 21 can also be a material that can quickly transfer heat. For example, the material of the cold storage chamber 21 is a metal material. With such a setting, the heat conduction plate 211 does not need to be provided. Of course, when the material of the cold storage chamber 21 is a material that can quickly transfer heat, the heat conduction plate 211 can also be provided. In this regard, the embodiments of the present application do not make any limitations here.

[0078] In addition, when the refrigeration component 25 includes a semiconductor refrigeration element 251, the first end of the semiconductor refrigeration element 251 is connected to the heat conduction plate 211. When the refrigeration component 25 includes a second heat exchange fin assembly 253, the second heat exchange fin assembly 253 is connected to the heat conduction plate 211.

[0079] In addition, in some embodiments, the refrigerant circuit further includes a first switching valve 50; one end of the first switching valve 50 is connected to the compressor 10, and the other end of the first switching valve 50 is respectively connected to the air conditioner evaporator 30, the refrigerator evaporator 22, and the battery cooler 40.

[0080] By providing the first switching valve 50, the state of the first switching valve 50 can be controlled, so that the refrigerant flowing out of the compressor 10 can flow to the air conditioner evaporator 30, the refrigerator evaporator 22, and the battery cooler 40, or the refrigerant flowing out of the compressor 10 can be prevented from flowing into the air conditioner evaporator 30, the refrigerator evaporator 22, and the battery cooler 40. Specifically, the first switching valve 50 can be made to be in an open state, so that the refrigerant flowing through the first switching valve 50 can flow into the air conditioner evaporator 30, the refrigerator evaporator 22, and the battery cooler 40; or the first switching valve 50 can be made to be in a closed state, so that the refrigerant flowing to the first switching valve 50 will not flow into the air conditioner evaporator 30, the refrigerator evaporator 22, and the battery cooler 40. That is, by providing the first switching valve 50, it is convenient to control whether the refrigerant flows into the air conditioner evaporator 30, the refrigerator evaporator 22, and the battery cooler 40.

[0081] In addition, in some embodiments, the refrigerant circuit further includes a first expansion valve 60; one end of the first expansion valve 60 is connected to the other end of the first switching valve 50, and the other end of the first expansion valve 60 is connected to the air conditioner evaporator 30, so that the other end of the first switching valve 50 is connected to the air conditioner evaporator 30 through the first expansion valve 60. Among them, the first expansion valve 60 is used to adjust the flow rate of the refrigerant flowing into the air conditioner evaporator 30.

[0082] Since one end of the first expansion valve 60 is connected to the other end of the first switching valve 50, and the other end of the first expansion valve 60 is connected to the air-conditioning evaporator 30, it is equivalent that the first switching valve 50 and the air-conditioning evaporator 30 are connected through the first expansion valve 60. The opening degree of the first expansion valve 60 can be adjusted, so that the flow rate of the refrigerant flowing into the air-conditioning evaporator 30 can be adjusted, and the temperature of the vehicle air conditioner can be changed. That is, by setting the first expansion valve 60, it is convenient to adjust the temperature of the vehicle air conditioner.

[0083] It should be noted that when the air-conditioning evaporator 30 includes a first evaporator 31 and a second evaporator 32, the first expansion valve 60 may include a first valve 61 and a second valve 62. The first valve 61 is connected to the first evaporator 31 and the first switching valve 50, and the second valve 62 is connected to the second evaporator 32 and the first switching valve 50.

[0084] In addition, in some embodiments, the refrigerant circuit further includes a second expansion valve 70; one end of the second expansion valve 70 is connected to the other end of the first switching valve 50, and the other end of the second expansion valve 70 is connected to the refrigerator evaporator 22, so that the other end of the first switching valve 50 is connected to the refrigerator evaporator 22 through the second expansion valve 70. Wherein, the second expansion valve 70 is used to adjust the flow rate of the refrigerant flowing into the refrigerator evaporator 22.

[0085] Since one end of the second expansion valve 70 is connected to the other end of the first switching valve 50, and the other end of the second expansion valve 70 is connected to the refrigerator evaporator 22, it is equivalent that the first switching valve 50 and the refrigerator evaporator 22 are connected through the second expansion valve 70. The opening degree of the second expansion valve 70 can be adjusted, so that the flow rate of the refrigerant flowing into the refrigerator evaporator 22 can be adjusted, and the temperature of the refrigerator evaporator 22 can be changed. That is, by setting the second expansion valve 70, it is convenient to adjust the temperature of the refrigerator assembly 20.

[0086] In addition, in some embodiments, the refrigerant circuit further includes a third expansion valve 80; one end of the third expansion valve 80 is connected to the other end of the first switching valve 50, and the other end of the third expansion valve 80 is connected to the battery cooler, so that the other end of the first switching valve 50 is connected to the battery cooler through the third expansion valve 80. The third expansion valve 80 is used to adjust the flow rate of the refrigerant flowing into the battery cooler 40

[0087] Since one end of the third expansion valve 80 is connected to the other end of the first switching valve 50 and the other end of the third expansion valve 80 is connected to the battery cooler, it is equivalent to connecting the first switching valve 50 to the battery cooler 40. Thus, the opening degree of the third expansion valve 80 can be adjusted to open or close the third expansion valve 80, and further, refrigerant can flow into the battery cooler 40 to cool the vehicle battery, or no refrigerant flows into the battery cooler 40, so that the battery cooler 40 does not cool the vehicle battery. That is, by providing the third expansion valve 80, it is convenient to control whether the battery cooler 40 cools the battery.

[0088] In addition, in some embodiments, the refrigerant circuit further includes a water-cooled condenser 90, an outdoor heat exchanger 100, a gas-liquid separator 110, a second switching valve 120, and a third switching valve 130; the water-cooled condenser 90 is connected to one end of the first switching valve 50 so that one end of the first switching valve 50 is connected to the compressor 10 through the water condenser, the gas-liquid separator 110 has an input end and an output end, the outdoor heat exchanger 100 is connected to the water-cooled condenser 90, the outdoor heat exchanger 100 is respectively connected to the air-conditioning evaporator 30, the refrigerator evaporator 22, and the battery cooler through the third switching valve 130, and the outdoor heat exchanger 100 is connected to the input end of the gas-liquid separator 110 through the second switching valve 120. The air-conditioning evaporator 30, the refrigerator evaporator 22, and the battery cooler are all connected to the input end of the gas-liquid separator 110, and the output end of the gas-liquid separator 110 is connected to the compressor 10.

[0089] With such an arrangement, once the compressor 10 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, the high-temperature and high-pressure gaseous refrigerant can pass through the water-cooled condenser 90 and / or the outdoor heat exchanger 100, that is, exchange heat with the water-cooled condenser 90 and / or the outdoor heat exchanger 100, so that the gaseous refrigerant becomes a liquid refrigerant. Then the liquid refrigerant can flow through the air-conditioning evaporator 30, the battery cooler 40, and the refrigerator evaporator 22. Thus, the air-conditioning evaporator 30 can cool the vehicle air conditioner, the refrigerant flowing through the refrigerator evaporator 22 can cool the refrigerator assembly 20, and the refrigerant flowing through the battery cooler 40 can cool the vehicle battery by the battery cooler 40. After that, the refrigerant flowing out of the refrigerator evaporator 22, the refrigerant flowing out of the battery cooler 40, and the refrigerant flowing out of the air-conditioning evaporator 30 can flow into the gas-liquid separator 110. The gas-liquid separator 110 can separate the gas and liquid of the refrigerant, and then flow into the compressor 10 to realize the circulating flow of the refrigerant.

[0090] In addition, in some embodiments, the refrigerant circuit further includes a fourth expansion valve 140; the outdoor heat exchanger 100 is connected to the water-cooled condenser 90 through the fourth expansion valve 140. Through such an arrangement, by controlling the opening or closing of the fourth expansion valve 140, the outdoor heat exchanger 100 can be connected or disconnected from the water-cooled condenser 90. That is, by providing the fourth expansion valve 140, it is convenient to control whether the outdoor heat exchanger 100 and the water-cooled condenser 90 are connected.

[0091] In addition, in the embodiments of the present application, the refrigerant circuit of the vehicle may further include a pressure sensor and a temperature sensor. Each component can be connected through a pipeline, and a pressure sensor and a temperature sensor can be provided on the pipeline, and the pressure sensor and the temperature sensor can be integrated together. For example, as Figure 1 shown, Figure 1 in which PT represents the integration of the pressure sensor and the temperature sensor, and T represents the temperature sensor.

[0092] In the embodiments of the present application, by providing that the refrigerator evaporator 22, the air conditioner evaporator 30, and the battery cooler 40 are all connected to the compressor 10, and the refrigerator evaporator 22, the air conditioner evaporator 30, and the battery cooler 40 are all connected to the compressor 10, it is equivalent to the air conditioning system and the refrigerator system of the vehicle sharing the same compressor 10. Thus, the compressor 10 of the refrigerator system in the vehicle can be cancelled, and only through one compressor 10, the refrigeration of the air conditioning system and the refrigeration of the refrigerator system of the vehicle can be realized, thereby effectively reducing the cost of the vehicle.

[0093] It should be noted that in Figures 1 to 4 it, the dotted line indicates that this branch is not connected.

[0094] The embodiments of the present application provide a thermal management system, which includes a coolant circuit and the refrigerant circuit in any one of the above embodiments; the refrigerant circuit is coupled with the coolant circuit.

[0095] The embodiments of the present application provide a control method, which is applied to the thermal management system in the above embodiments. The refrigerant circuit includes a first expansion valve 60, a second expansion valve 70, a third expansion valve 80, a fourth expansion valve 140, a first switching valve 50, a second switching valve 120, a third switching valve 130, a water-cooled condenser 90, an outdoor heat exchanger 100, and a gas-liquid separator 110. As Figure 7 shown, the control method includes:

[0096] Step 701: Determine the working mode of the thermal management system.

[0097] Among them, the controller in the vehicle can determine the working mode of the thermal management system in real time.

[0098] Step 702: Based on the operating mode of the thermal management system, control the first expansion valve 60, the second expansion valve 70, the third expansion valve 80, the fourth expansion valve 140, the first switching valve 50, the second switching valve 120, and the third switching valve 130 to switch between the open state and the closed state.

[0099] In some implementation manners, the implementation manner of step 702 may be: when the thermal management system is in the mode of air-conditioning refrigeration, the refrigerator component 20 is operating, and the battery is being cooled, control the first expansion valve 60, the second expansion valve 70, the third expansion valve 80, the fourth expansion valve 140, and the third switching valve 130 to be all in the open state, and control the first switching valve 50 and the second switching valve 120 to be all in the closed state.

[0100] Among them, when it is summer, once the thermal management system is in the mode of air-conditioning refrigeration, the refrigerator component 20 is operating, and the battery is being cooled, by controlling the first expansion valve 60, the second expansion valve 70, the third expansion valve 80, the fourth expansion valve 140, and the third switching valve 130 to be all in the open state, and controlling the first switching valve 50 and the second switching valve 120 to be all in the closed state, as Figure 1 shown, it can make the high-temperature and high-pressure refrigerant flowing out of the compressor 10 flow through the water-cooled condenser 90, and then flow through the outdoor heat exchanger 100. The outdoor heat exchanger 100 and the water-cooled condenser 90 jointly serve as a condenser to cool down the refrigerant. Then the refrigerant flows into the air-conditioning evaporator 30, the battery cooler 40, and the refrigerator evaporator 22, so that the air-conditioning refrigerates, the refrigerator component 20 operates, and the battery cooler cools the battery.

[0101] In some implementation manners, the implementation manner of step 702 may be: when the thermal management system is in the mode of the air-conditioning being turned off, the refrigerator component 20 is operating, and the battery stops being cooled, control the second expansion valve 70, the fourth expansion valve 140, and the third switching valve 130 to be all in the open state, and control the first expansion valve 60, the third expansion valve 80, the first switching valve 50, and the second switching valve 120 to be all in the closed state.

[0102] Among them, when it is spring or autumn, once the thermal management system is in the mode of the air-conditioning being turned off, the refrigerator component 20 is operating, and the battery stops being cooled, by controlling the second expansion valve 70, the fourth expansion valve 140, and the third switching valve 130 to be all in the open state, and controlling the first expansion valve 60, the third expansion valve 80, the first switching valve 50, and the second switching valve 120 to be all in the closed state, as Figure 2 shown, it can make the high-temperature and high-pressure refrigerant flowing out of the compressor 10 flow through the water-cooled condenser 90, and then flow through the outdoor heat exchanger 100. The outdoor heat exchanger 100 and the water-cooled condenser 90 jointly serve as a condenser to cool down the refrigerant. Then the refrigerant flows into the refrigerator evaporator 22, so that the refrigerator component 20 operates for refrigeration.

[0103] In addition, through the refrigerant phase change cold storage process, the matching between the 10 displacements of the vehicle compressor and the small cooling capacity required by the refrigerator can be achieved. The compressor 10 can be started and operated for a short time for refrigeration and ice making, so that the phase change refrigerant 001 in the cold storage chamber 21 undergoes a phase change to freeze, and the cold is slowly released through the first heat exchange fin assembly 252 and the second heat exchange fins to achieve refrigeration of the refrigerator assembly 20.

[0104] In some implementation manners, the implementation manner of step 702 can be: when the thermal management system is in the mode of working for the refrigerator assembly 20, cooling the battery and heating the air conditioner, control the first expansion valve 60 and the third switching valve 130 to be in the closed state, and control the second expansion valve 70, the third expansion valve 80, the fourth expansion valve 140, the first switching valve 50 and the second switching valve 120 to be in the open state.

[0105] Among them, when it is winter, once the thermal management system is in the mode of working for the refrigerator assembly 20, cooling the battery and heating the air conditioner, by controlling the first expansion valve 60 and the third switching valve 130 to be in the closed state, and controlling the second expansion valve 70, the third expansion valve 80, the fourth expansion valve 140, the first switching valve 50 and the second switching valve 120 to be in the open state, as Figure 3 shown, the high-temperature and high-pressure refrigerant flowing out of the compressor 10 can flow through the water-cooled condenser 90, and then through the outdoor heat exchanger 100, and the refrigerant flowing out of the water-cooled condenser 90 flows into the battery cooler and the refrigerator cooler, and then the refrigerant flows into the refrigerator evaporator 22, so that the refrigerator assembly 20 works for refrigeration, and the battery cooler can cool the battery.

[0106] In some implementation manners, the implementation manner of step 702 can be: when the thermal management system is in a low-temperature environment and the refrigerator assembly 20 is in the working mode, control the second expansion valve 70 and the first switching valve 50 to be in the open state, and control the first expansion valve 60, the third expansion valve 80, the second switching valve 120, the third switching valve 130 and the fourth expansion valve 140 to be in the open state.

[0107] Among them, when it is winter, once the thermal management system is in a low-temperature environment and the refrigerator assembly 20 is in the working mode, by controlling the second expansion valve 70 and the first switching valve 50 to be in the open state, and controlling the first expansion valve 60, the third expansion valve 80, the second switching valve 120, the third switching valve 130 and the fourth expansion valve 140 to be in the open state, as Figure 4 shown, the high-temperature and high-pressure refrigerant flowing out of the compressor 10 can flow through the water-cooled condenser 90, and the refrigerant flowing out of the water-cooled condenser 90 flows into the refrigerator cooler, so that the refrigerator assembly 20 works for refrigeration.

[0108] In addition, in some implementation manners, the control method further includes: determining whether the refrigerator component 20 is in a defrosting mode;

[0109] When the refrigerator component 20 is in the defrosting mode, switch the current direction of the semiconductor refrigerating element 251 so that the current direction in the semiconductor refrigerating element 251 is different from the initial current direction in the semiconductor refrigerating element 251, and the end of the semiconductor refrigerating element 251 facing the first heat exchange fin assembly is the hot end, and the end of the semiconductor refrigerating element 251 facing the cold storage cavity 21 is the cold end.

[0110] Specifically, after frosting occurs in the second cavity 24, the current flowing through the semiconductor refrigerating element 251 can be changed so that the second end of the semiconductor refrigerating element 251 is the hot end and the first end is the cold end, thereby increasing the temperature of the first heat exchange fin assembly 252. Then, when the air flowing out of the second cavity 24 passes through the first heat exchange fin assembly 252, the temperature of the air is increased, and the air with an increased temperature flows into the second cavity 24, so that the frost in the second cavity 24 is removed, which is equivalent to defrosting the second cavity 24.

[0111] The embodiment of the present application provides a vehicle, and the vehicle includes the thermal management system in the above embodiment.

[0112] It should be noted that the types of vehicles include, but are not limited to, electric vehicles, hybrid vehicles, etc.

[0113] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0114] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A refrigerant circuit, characterized in that: include: compressors, refrigerator components, air conditioning evaporators, and battery coolers; The refrigerator assembly includes a refrigerator evaporator. The refrigerator evaporator, the air conditioner evaporator and the battery cooler are all connected to the compressor, and the refrigerator evaporator, the air conditioner evaporator and the battery cooler are arranged in parallel.

2. The refrigerant circuit according to claim 1, characterized in that: The refrigerator assembly further comprises a cold storage cavity, in which a phase-change refrigerant is arranged, and the refrigerator evaporator is located in the cold storage cavity, and the refrigerator evaporator is in contact with the phase-change refrigerant.

3. The refrigerant circuit according to claim 2, characterized in that: The refrigerator assembly also includes a first cavity and a second cavity, the cold storage cavity is located in the first cavity, and there is a gap between the cold storage cavity and the second cavity, a refrigeration assembly is arranged in the gap, and the refrigeration assembly is respectively connected to the cold storage cavity and the second cavity, a refrigeration fan is arranged in the first cavity, an air duct is arranged in the second cavity, the refrigeration fan faces the air duct, and the gap is connected to the air duct and the interior of the second cavity.

4. The refrigerant circuit according to claim 3, characterized in that: The refrigeration assembly includes a semiconductor refrigeration element, and the semiconductor refrigeration element has a first end and a second end opposite to each other, wherein the first end is connected to the cold storage cavity, and the second end is connected to the second cavity.

5. The refrigerant circuit according to claim 4, characterized in that: The refrigeration assembly also includes a first heat exchange fin assembly, which is located between the semiconductor refrigeration element and the second cavity, and one end of the first heat exchange fin assembly is connected to the semiconductor refrigeration element, and the other end of the first heat exchange fin assembly is connected to the second cavity, so that the semiconductor refrigeration element is connected to the second cavity through the first heat exchange fin assembly.

6. The refrigerant circuit according to claim 5, characterized in that: The refrigeration assembly also includes a second heat exchange fin assembly, which is spaced apart from the first heat exchange fin assembly in the gap, one end of the second heat exchange fin assembly is connected to the second cavity, and the other end of the second heat exchange fin assembly is connected to the cold storage cavity.

7. The refrigerant circuit according to claim 3, characterized in that: A heat conducting plate is arranged on the outer wall of the cold storage cavity facing the second cavity, and the refrigeration assembly is connected to the heat conducting plate.

8. The refrigerant circuit according to any one of claims 1 to 7, characterized in that: The refrigerant circuit also includes a first switch valve; One end of the first switch valve is connected to the compressor, and the other end of the first switch valve is respectively connected to the air conditioner evaporator, the refrigerator evaporator and the battery cooler.

9. The refrigerant circuit according to claim 8, characterized in that The refrigerant circuit also includes a first expansion valve; One end of the first expansion valve is connected to the other end of the first switch valve, and the other end of the first expansion valve is connected to the air-conditioning evaporator, so that the other end of the first switch valve is connected to the air-conditioning evaporator through the first expansion valve.

10. The refrigerant circuit according to claim 8, characterized in that The refrigerant circuit also includes a second expansion valve; One end of the second expansion valve is connected to the other end of the first switch valve, and the other end of the second expansion valve is connected to the refrigerator evaporator, so that the other end of the first switch valve is connected to the refrigerator evaporator through the second expansion valve.

11. The refrigerant circuit according to claim 8, characterized in that: The refrigerant circuit also includes a third expansion valve; One end of the third expansion valve is connected to the other end of the first switch valve, and the other end of the third expansion valve is connected to the battery refrigerator, so that the other end of the first switch valve is connected to the battery refrigerator through the third expansion valve.

12. The refrigerant circuit according to any one of claims 9 to 11, characterized in that: The refrigerant circuit also includes a water-cooled condenser, an outdoor heat exchanger, a gas-liquid separator, a second switch valve and a third switch valve; The water-cooled condenser is connected to one end of the first switch valve so that one end of the first switch valve is connected to the compressor through the water condenser. The gas-liquid separator has an input end and an output end. The outdoor heat exchanger is connected to the water-cooled condenser. The outdoor heat exchanger is respectively connected to the air-conditioning evaporator, the refrigerator evaporator and the battery refrigerator through the third switch valve, and the outdoor heat exchanger is connected to the input end of the gas-liquid separator through the second switch valve. The air-conditioning evaporator, the refrigerator evaporator and the battery refrigerator are all connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected to the compressor.

13. The refrigerant circuit according to claim 12, characterized in that: The refrigerant circuit also includes a fourth expansion valve; The outdoor heat exchanger is connected to the water-cooled condenser through the fourth expansion valve.

14. A thermal management system, characterized in that: The thermal management system comprises the refrigerant circuit according to any one of claims 1-13.

15. A control method, characterized in that: The control method is applied to the thermal management system according to claim 14, wherein the refrigerant circuit includes a first expansion valve, a second expansion valve, a third expansion valve, a fourth expansion valve, a first switch valve, a second switch valve, a third switch valve, a water-cooled condenser, an outdoor heat exchanger, and a gas-liquid separator, and the control method includes: determining an operating mode of the thermal management system; Based on the working mode of the thermal management system, the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switch valve, the second switch valve, and the third switch valve are controlled to switch between an open state and a closed state.

16. The control method according to claim 15, characterized in that: The method of controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switch valve, the second switch valve, and the third switch valve to switch between an open state and a closed state based on the working mode of the thermal management system includes: When the thermal management system is in the air-conditioning cooling mode, the refrigerator component is working and the battery is cooling the mode, the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve and the third switch valve are all controlled to be in the open state, and the first switch valve and the second switch valve are all controlled to be in the closed state.

17. The control method according to claim 15, characterized in that: The method of controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switch valve, the second switch valve, and the third switch valve to switch between an open state and a closed state based on the working mode of the thermal management system includes: When the thermal management system is in a mode in which the air conditioner is turned off, the refrigerator component is working, and the battery stops cooling, the second expansion valve, the fourth expansion valve, and the third switch valve are all controlled to be in an open state, and the first expansion valve, the third expansion valve, the first switch valve, and the second switch valve are all controlled to be in a closed state.

18. The control method according to claim 15, characterized in that: The method of controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switch valve, the second switch valve, and the third switch valve to switch between an open state and a closed state based on the working mode of the thermal management system includes: When the thermal management system is in the mode where the refrigerator component is working, the battery is cooling and the air conditioner is heating, the first expansion valve and the third switch valve are controlled to be in a closed state, and the second expansion valve, the third expansion valve, the fourth expansion valve, the first switch valve and the second switch valve are controlled to be in an open state.

19. The control method according to claim 15, characterized in that: The method of controlling the first expansion valve, the second expansion valve, the third expansion valve, the fourth expansion valve, the first switch valve, the second switch valve, and the third switch valve to switch between an open state and a closed state based on the working mode of the thermal management system includes: When the thermal management system is in a low-temperature environment and the refrigerator component is in working mode, the second expansion valve and the first switch valve are controlled to be in an open state, and the first expansion valve, the third expansion valve, the second switch valve, the third switch valve and the fourth expansion valve are controlled to be in an open state.

20. The control method according to claim 15, characterized in that: The control method further includes: determining whether the refrigerator assembly is in a defrost mode; When the refrigerator assembly is in defrost mode, the current direction of the semiconductor refrigeration element is switched so that the current direction in the semiconductor refrigeration element is different from the initial current direction in the semiconductor refrigeration element, and the end of the semiconductor refrigeration element facing the first heat exchange fin assembly is the hot end, and the end of the semiconductor refrigeration element facing the cold storage chamber is the cold end.

21. A vehicle, characterized in that: The vehicle comprises a refrigerant circuit as claimed in any one of claims 1 to 13, or a thermal management system as claimed in claim 14.

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