Battery cooling system and vehicle

Abstract

The embodiment of the utility model provides a battery cooling system and a vehicle. The battery cooling system comprises a battery assembly, a compressor, a condenser and a heat exchanger, a first branch, a second branch and a third branch are arranged between the heat exchanger and the compressor, the condenser is arranged on the first branch, and the battery assembly is arranged on the third branch; when the temperature of the battery assembly is lower than a first threshold value, the second branch is communicated with the third branch so as to carry out temperature compensation on the battery assembly; according to the invention, the temperature of the refrigerant entering the battery can be controlled by compensating the temperature of the battery assembly, so that the risk of lithium precipitation of the battery caused by too low temperature under a low-temperature condition is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and more specifically, to a battery cooling system and a vehicle. Background Art

[0002] In the prior art, when cooling a lithium battery, since the refrigerant will first be cooled by an external or internal condenser of the vehicle and then enter the battery assembly, when the ambient temperature is relatively low, the temperature of the refrigerant entering the battery assembly is relatively low, which is likely to cause the risk of lithium deposition in the battery within the battery assembly.

[0003] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Utility Model

[0004] An object of the utility model is to provide a new technical solution for a battery cooling system and a vehicle.

[0005] According to a first aspect of the utility model, a battery cooling system is provided, wherein the battery cooling system includes:

[0006] A battery assembly, a compressor, a condenser, and a heat exchanger. There are a first branch, a second branch, and a third branch between the heat exchanger and the compressor. The condenser is arranged in the first branch, and the battery assembly is arranged in the third branch;

[0007] When the temperature of the battery assembly is lower than a first threshold, the second branch communicates with the third branch to perform temperature compensation on the battery assembly.

[0008] Optionally, the battery cooling system further includes a first electronic expansion valve;

[0009] When the temperature of the battery assembly is lower than the first threshold, the first electronic expansion valve communicates the second branch with the third branch to perform temperature compensation on the battery assembly.

[0010] Optionally, the opening degree of the first electronic expansion valve is inversely proportional to the temperature of the battery assembly.

[0011] Optionally, the compressor includes a first outlet; the heat exchanger includes a first interface; the condenser includes a first condenser, and the first condenser includes a fifth interface and a sixth interface;

[0012] The battery cooling system further includes a first control component, and the first control component has a first state;

[0013] In the first state, the first outlet communicates with the fifth interface, and the sixth interface communicates with the first interface to form a first branch.

[0014] Optionally, the heat exchanger further includes a third interface; the condenser further includes a second condenser, and the second condenser includes a seventh interface and an eighth interface;

[0015] The first control component further has a second state;

[0016] In the second state, the first outlet communicates with the seventh interface, and the eighth interface communicates with the third interface to form a first branch;

[0017] Wherein, in the first state, the first outlet is disconnected from the seventh interface, or the eighth interface is disconnected from the third interface; in the second state, the first outlet is disconnected from the fifth interface, or the sixth interface is disconnected from the first interface.

[0018] Optionally, the first control component includes a first solenoid valve and a seventh solenoid valve. The first solenoid valve is disposed between the first outlet and the seventh interface, and the seventh solenoid valve is disposed between the first outlet and the fifth interface;

[0019] In the first state, the first solenoid valve is closed and the seventh solenoid valve is open;

[0020] In the second state, the first solenoid valve is open and the seventh solenoid valve is closed.

[0021] Optionally, the compressor includes a second inlet; the heat exchanger includes a second interface;

[0022] The second interface communicates with the second inlet to form a second branch.

[0023] Optionally, the compressor includes a first inlet; the heat exchanger includes a third interface; the battery assembly includes a first end and a second end;

[0024] The battery cooling system further includes a second control component, and the second control component has a third state;

[0025] In the third state, the third interface communicates with the first end, and the second end communicates with the first inlet to form a third branch.

[0026] Optionally, the heat exchanger further includes a first interface;

[0027] The second control component further has a fourth state;

[0028] In the fourth state, the first interface communicates with the first end, and the second end communicates with the first inlet to form a third branch;

[0029] Wherein, in the third state, the first interface is disconnected from the first end; in the fourth state, the third interface is disconnected from the first end.

[0030] Optionally, the second control component includes a third solenoid valve and a ninth solenoid valve. The third solenoid valve is disposed between the first interface and the first end, and the ninth solenoid valve is disposed between the third interface and the first end.

[0031] In the third state, the third solenoid valve is closed and the ninth solenoid valve is open.

[0032] In the fourth state, the third solenoid valve is open and the ninth solenoid valve is closed.

[0033] Optionally, the battery cooling system further includes a plate heat exchanger, and the plate heat exchanger includes a ninth interface and a tenth interface.

[0034] The second control component further includes a fifth electronic expansion valve and a fourth solenoid valve.

[0035] In the fourth state, the first interface is communicated with the ninth interface through the fifth electronic expansion valve, and the tenth interface is communicated with the first inlet through the fourth solenoid valve to form a fourth branch.

[0036] Optionally, the battery cooling system further includes a second electronic expansion valve.

[0037] The heat exchanger further includes a third interface and a fourth interface, and the third interface is communicated with the fourth interface through the second electronic expansion valve.

[0038] Optionally, the battery cooling system further includes a second electronic expansion valve.

[0039] The heat exchanger further includes a fourth interface, and the fourth interface is communicated with the eighth interface through the second electronic expansion valve.

[0040] Optionally, the battery cooling system further includes a first check valve and a fourth electronic expansion valve.

[0041] In the first state, the sixth interface is communicated with the first interface through the first check valve.

[0042] In the second state, the sixth interface is communicated with the first interface through the fourth electronic expansion valve.

[0043] Optionally, the compressor further includes a first inlet.

[0044] The first control component further includes a second solenoid valve, and the second solenoid valve is disposed between the first inlet and the fifth interface.

[0045] In the first state, the second solenoid valve is closed;

[0046] In the second state, the second solenoid valve is open.

[0047] According to a second aspect of the present invention, a vehicle is provided, including the battery cooling system according to any one of the first aspects.

[0048] According to the battery cooling system provided by the embodiments of the present invention, the battery cooling system includes a battery assembly, a compressor, a condenser, and a heat exchanger. There are a first branch, a second branch, and a third branch between the heat exchanger and the compressor. The condenser is arranged in the first branch, and the battery assembly is arranged in the third branch; when the temperature of the battery assembly is lower than a first threshold, the second branch communicates with the third branch to perform temperature compensation on the battery assembly; the present application can realize temperature control of the refrigerant entering the battery through temperature compensation of the battery assembly, effectively solving the risk of lithium plating in the battery due to too low temperature under low temperature conditions.

[0049] Through the following detailed description of the exemplary embodiments of the present invention with reference to the drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0051] Figure 1 It is a schematic structural diagram of a battery cooling system in an embodiment of the present invention.

[0052] Figure 2 It is a schematic structural diagram of the cooling working condition of the battery assembly in an embodiment of the present invention.

[0053] Figure 3 It is a schematic structural diagram of the heating of the passenger compartment and the cooling working condition of the battery assembly in an embodiment of the present invention.

[0054] Description of the reference numerals:

[0055] 1. Compressor; 101. First inlet; 102. Second inlet; 103. First outlet;

[0056] 2. Second condenser; 201. Seventh interface; 202. Eighth interface;

[0057] 3. Heat exchanger; 301. First interface; 302. Second interface; 303. Third interface; 304. Fourth interface;

[0058] 4. First condenser; 401. Fifth interface; 402. Sixth interface;

[0059] 5. Battery assembly; 501. First end; 502. Second end;

[0060] 6. Evaporator; 601. Third end; 602. Fourth end;

[0061] 7. Plate heat exchanger; 701. Ninth interface; 702. Tenth interface;

[0062] 8. Eighth solenoid valve;

[0063] 9. First solenoid valve;

[0064] 10. Second solenoid valve;

[0065] 11. Tenth solenoid valve;

[0066] 12. Fifth solenoid valve;

[0067] 13. Sixth solenoid valve;

[0068] 14. Seventh solenoid valve;

[0069] 15. Ninth solenoid valve;

[0070] 16. Third solenoid valve;

[0071] 17. Fourth solenoid valve;

[0072] 18. Fourth electronic expansion valve;

[0073] 19. Third electronic expansion valve;

[0074] 20. First electronic expansion valve;

[0075] 21. Seventh electronic expansion valve;

[0076] 22. Second electronic expansion valve;

[0077] 23. Fifth electronic expansion valve;

[0078] 24. Sixth electronic expansion valve;

[0079] 25. First check valve;

[0080] 26. Second check valve;

[0081] 27. Third check valve. Detailed implementation mode

[0082] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present utility model.

[0083] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0084] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present 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. The character " / " generally means that the associated objects before and after are in an "or" relationship.

[0085] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "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 accompanying drawings, and is only for the convenience of describing the present 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 limiting the present application.

[0086] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0087] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0088] According to an embodiment of the present application, a battery cooling system is provided. Referring toFigures 1 to 3 The battery cooling system includes a battery assembly 5, a compressor 1, a condenser, and a heat exchanger 3. There are a first branch, a second branch, and a third branch between the heat exchanger 3 and the compressor 1. The condenser is disposed in the first branch, and the battery assembly 5 is disposed in the third branch; when the temperature of the battery assembly 5 is lower than a first threshold, the second branch communicates with the third branch to perform temperature compensation on the battery assembly 5.

[0089] Specifically, as Figures 1 to 3 shown, there are a first branch, a second branch, and a third branch between the heat exchanger 3 and the compressor 1 in the embodiment of the present application. The first branch refers to the flow path of the refrigerant flowing from the compressor 1 to the heat exchanger 3, and the second branch and the third branch refer to the flow paths of the refrigerant flowing back from the heat exchanger 3 to the compressor 1.

[0090] Thus, when the temperature of the battery assembly 5 is greater than or equal to the first threshold, the second branch does not communicate with the third branch, and the battery cooling system controls the temperature of the refrigerant entering the battery assembly 5 through the third branch; when the temperature of the battery assembly 5 is lower than the first threshold, that is, when the ambient temperature is relatively low, the second branch communicates with the third branch, and the battery cooling system performs temperature compensation on the battery assembly 5 through the second branch, that is, increases the enthalpy of the refrigerant in the third branch entering the battery assembly 5 through the second branch, thereby effectively realizing the temperature control of the refrigerant entering the battery assembly 5 and significantly avoiding the risk of lithium deposition in the battery in the battery assembly 5 due to the relatively low temperature of the refrigerant.

[0091] Wherein, the temperature of the refrigerant flowing from the heat exchanger 3 to the second branch is higher than the temperature of the refrigerant flowing from the heat exchanger 3 to the third branch, so that the temperature of the refrigerant after the second branch and the third branch converge is higher than the temperature of the refrigerant in the third branch, effectively realizing the temperature compensation of the second branch for the battery assembly 5.

[0092] For example, the battery cooling system in the embodiment of the present application can be provided with a second electronic expansion valve 22, so that the refrigerant flowing out of the heat exchanger 3 can absorb heat again after passing through the throttling of the second electronic expansion valve 22 and then return to the heat exchanger 3, thereby realizing that the temperature of the refrigerant flowing out of the second branch is higher than the temperature of the refrigerant flowing out of the third branch.

[0093] Of course, in the embodiments of the present application, the heat exchanger 3 can also be specially designed. For example, two different flow paths can be provided in the heat exchanger 3 so that the temperature of the refrigerant flowing from the heat exchanger 3 to the second branch is higher than the temperature of the refrigerant flowing from the heat exchanger 3 to the third branch. Those skilled in the art can make selections according to actual needs, and the present application does not make specific limitations here.

[0094] In addition, in the embodiments of the present application, the flow path in which the second branch and the third branch are connected to perform temperature compensation on the battery assembly 5 is called an enthalpy-increasing flow path.

[0095] Furthermore, when the battery cooling system in the embodiments of the present application is in the following several working conditions, it can control the temperature of the refrigerant entering the battery assembly 5 through the enthalpy-increasing flow path when the temperature of the battery assembly 5 is lower than the first threshold, so that the battery cooling system has the function of cooling the battery in the battery assembly 5 at low temperatures, effectively avoiding the risk of lithium plating of the battery, and significantly extending the service life of the battery.

[0096] For example Figure 2 As shown, when the battery cooling system in the embodiments of the present application is in the battery assembly cooling working condition, the battery cooling system includes a compressor 1, a first condenser 4, a heat exchanger 3, and a battery assembly 5. The heat exchanger 3 includes a first interface 301, a second interface 302, a third interface 303, and a fourth interface 304. Thus, the battery cooling system has the following several flow paths:

[0097] First, the compressor 1, the first condenser 4, the first interface 301, the third interface 303, and the battery assembly 5 are connected to form a first circulation flow path, and the first circulation flow path can cyclically cool the battery in the battery assembly 5.

[0098] Second, the compressor 1, the first condenser 4, the first interface 301, and the second interface 302 are connected to form a second circulation flow path, and the second circulation flow path can cyclically perform air charging and enthalpy increase on the compressor 1, thereby significantly increasing the circulation amount of the refrigerant.

[0099] Third, the compressor 1, the first condenser 4, the first interface 301, the third interface 303, the fourth interface 304, and the second interface 302 are connected to form a third circulation flow path, and the third circulation flow path can realize the enthalpy increase of the heat exchanger 3, thereby further increasing the circulation amount of the refrigerant, and then significantly improving the heating capacity of the heat exchanger 3.

[0100] Fourth, the compressor 1, the first condenser 4, the first interface 301, the second interface 302, the first electronic expansion valve 20, and the battery assembly 5 are connected to form a first enthalpy-increasing flow path. The first enthalpy-increasing flow path can, together with the first circulation flow path, cool the batteries in the battery assembly 5, that is, realize the temperature compensation for the first circulation flow path.

[0101] For another example Figure 3 As shown, when the battery cooling system according to the embodiment of the present application is in the condition of heating the passenger compartment and cooling the battery assembly, the battery cooling system includes a compressor 1, a first condenser 4, a second condenser 2, a heat exchanger 3, a battery assembly 5, and a plate heat exchanger 7. The heat exchanger 3 includes a first interface 301, a second interface 302, a third interface 303, and a fourth interface 304. Thus, the battery cooling system has the following several flow paths:

[0102] First, the compressor 1, the second condenser 2, the third interface 303, and the second interface 302 are connected to form a fourth circulation flow path. The fourth circulation flow path can circulate to supplement gas and increase the enthalpy of the compressor 1, thereby significantly increasing the circulation amount of the refrigerant.

[0103] Second, the compressor 1, the second condenser 2, the fourth interface 304, and the second interface 302 are connected to form a fifth circulation flow path. The fifth circulation flow path can, together with the fourth circulation flow path, circulate to increase the enthalpy of the compressor 1, thereby further increasing the circulation amount of the refrigerant.

[0104] Third, the compressor 1, the second condenser 2, the fourth interface 304, the first interface 301, and the first condenser 4 are connected to form a sixth circulation flow path. The sixth circulation flow path can absorb heat from the air through the first condenser 4, thereby further improving the effect of supplementing gas and increasing the enthalpy of the compressor 1 by the heat exchanger 3.

[0105] Fourth, the compressor 1, the second condenser 2, the fourth interface 304, the first interface 301, and the battery assembly 5 are connected to form a seventh circulation flow path. The seventh circulation flow path can circulate to cool the batteries in the battery assembly 5.

[0106] Fifth, the compressor 1, the second condenser 2, the fourth interface 304, the first interface 301, and the plate heat exchanger 7 are connected to form an eighth circulation flow path. The eighth circulation flow path can enhance the heat exchange capacity of the plate heat exchanger 7 and improve the heat absorption capacity of the plate heat exchanger 7 for the motor.

[0107] Sixth, the compressor 1, the second condenser 2, the third interface 303, the second interface 302, the first electronic expansion valve 20, and the battery assembly 5 are connected to form a second enthalpy-increasing flow path. The second enthalpy-increasing flow path can, together with the seventh circulation flow path, cool the batteries in the battery assembly 5, that is, achieve temperature compensation for the seventh circulation flow path.

[0108] Furthermore, as Figure 1 shown, the battery cooling system according to the embodiment of the present application further has an occupant compartment heating and battery assembly heating working condition. At this time, the second condenser 2 and the plate heat exchanger 7 serve as the low-pressure side, and the first condenser 4 and the battery assembly 5 serve as the high-pressure side.

[0109] Thus, when the battery cooling system according to the embodiment of the present application is in the occupant compartment heating and battery assembly heating working condition, the battery cooling system adds a fifth solenoid valve 12 on the basis of the above-mentioned occupant compartment heating and battery assembly cooling working condition, so that in addition to the six flow paths in the above-mentioned occupant compartment heating and battery assembly cooling working condition, the battery cooling system further has the following flow paths:

[0110] First, the compressor 1, the fifth solenoid valve 12, the battery assembly 5, the third interface 303, and the second interface 302 are connected to form a ninth circulation flow path. The ninth circulation flow path can, together with the fourth circulation flow path and the fifth circulation flow path, circulate back and forth to perform air supplement and enthalpy increase on the compressor 1, thereby significantly increasing the circulation amount of the refrigerant.

[0111] Second, the compressor 1, the fifth solenoid valve 12, the battery assembly 5, the fourth interface 304, and the second interface 302 are connected to form a tenth circulation flow path. The tenth circulation flow path can, together with the fourth circulation flow path, the fifth circulation flow path, and the ninth circulation flow path, circulate back and forth to perform enthalpy increase on the compressor 1, thereby further increasing the circulation amount of the refrigerant.

[0112] Third, the compressor 1, the fifth solenoid valve 12, the battery assembly 5, the fourth interface 304, the first interface 301, and the first condenser 4 are connected to form an eleventh circulation flow path. The eleventh circulation flow path can, together with the sixth circulation flow path, absorb heat from the air through the first condenser 4, thereby further improving the air supplement and enthalpy increase effect of the heat exchanger 3 on the compressor 1.

[0113] Fourth, the compressor 1, the fifth solenoid valve 12, the battery assembly 5, the fourth interface 304, the first interface 301, and the battery assembly 5 are connected to form a twelfth circulation flow path, and the twelfth circulation flow path can circulate reciprocally with the seventh circulation flow path to cool the battery in the battery assembly 5.

[0114] Fifth, the compressor 1, the fifth solenoid valve 12, the battery assembly 5, the fourth interface 304, the first interface 301, and the plate heat exchanger 7 are connected to form a thirteenth circulation flow path, and the thirteenth circulation flow path can enhance the heat exchange capacity of the plate heat exchanger 7 and improve the heat absorption capacity of the plate heat exchanger 7 for the motor together with the eighth circulation flow path.

[0115] Sixth, the compressor 1, the fifth solenoid valve 12, the battery assembly 5, the third interface 303, the second interface 302, the first electronic expansion valve 20, and the battery assembly 5 are connected to form a third enthalpy-increasing flow path, and the third enthalpy-increasing flow path can cool the battery in the battery assembly 5 together with the second enthalpy-increasing flow path, the seventh circulation flow path, and the twelfth circulation flow path, that is, realize the temperature compensation for the twelfth circulation flow path.

[0116] In addition, it should be noted that the refrigerant described in the embodiments of the present application may be at least one of R404a, R134a, R23, and R1234yf. The first end 501 is the refrigerant input end of the battery assembly 5, and the second end 502 is the refrigerant input end of the battery assembly 5. The first condenser 4 is an outdoor condenser, and the first condenser 4 may be a water-cooled condenser, a spray condenser, or an air-cooled condenser. The second condenser 2 is an indoor condenser, and the second condenser 2 may be a water-cooled condenser, a spray condenser, or an air-cooled condenser.

[0117] Optionally, the battery cooling system further includes a first electronic expansion valve 20; when the temperature of the battery assembly 5 is lower than the first threshold, the first electronic expansion valve 20 connects the second branch and the third branch to perform temperature compensation on the battery assembly 5.

[0118] Specifically, as Figures 1 to 3As shown, in the embodiment of the present application, through the setting of the first electronic expansion valve 20, when the temperature of the battery assembly 5 is greater than or equal to the first threshold, the first electronic expansion valve 20 is disconnected, and the second branch and the third branch are not connected. The battery cooling system controls the temperature of the refrigerant entering the battery assembly 5 through the third branch; when the temperature of the battery assembly 5 is lower than the first threshold, that is, when the ambient temperature is relatively low, the first electronic expansion valve 20 can connect the second branch and the third branch, so that the battery cooling system compensates the temperature of the battery assembly 5 through the second branch, that is, adds enthalpy by supplementing gas to the refrigerant in the third branch entering the battery assembly 5 through the second branch. In this way, the temperature control of the refrigerant entering the battery assembly 5 is effectively realized, and the risk of lithium plating occurring in the battery in the battery assembly 5 due to the relatively low temperature of the refrigerant is significantly avoided.

[0119] Among them, in the embodiment of the present application, the second branch and the third branch can also be connected by setting a third check valve 27 to better control the connection between the second branch and the third branch, and further better ensure the service performance of the battery assembly 5; alternatively, in the embodiment of the present application, the first electronic expansion valve 20 and the third check valve 27 can also be set at the same time to connect the second branch and the third branch, so as to further improve the temperature control of the refrigerant flowing from the second branch to the third branch on the basis of ensuring the connection performance between the second branch and the third branch, and at the same time effectively avoid the damage of the battery assembly 5 due to the too high temperature of the refrigerant flowing from the second branch to the third branch, thereby significantly improving the stability and reliability of the battery cooling system.

[0120] Optionally, the opening degree of the first electronic expansion valve 20 is inversely proportional to the temperature of the battery assembly 5.

[0121] Specifically, as Figures 1 to 3 shown, in the embodiment of the present application, by setting the opening degree of the first electronic expansion valve 20 to be inversely proportional to the temperature of the battery assembly 5, the battery cooling system can better control the temperature of the refrigerant entering the battery assembly 5, thereby further avoiding the risk of lithium plating occurring in the battery in the battery assembly 5 due to the relatively low temperature of the refrigerant, and significantly improving the working performance of the battery cooling system.

[0122] Among them, in the embodiment of the present application, other flow control valves can also be selected to adjust the refrigerant flow rate between the second branch and the third branch. For example, a globe valve, a butterfly valve, a diaphragm valve or a pressure reducing valve can be selected to adjust the refrigerant flow rate between the second branch and the third branch. Those skilled in the art can select according to actual needs, and the present application does not make specific limitations here.

[0123] Optionally, the compressor 1 includes a first outlet 103; the heat exchanger 3 includes a first interface 301; the condenser includes a first condenser 4, and the first condenser 4 includes a fifth interface 401 and a sixth interface 402; the battery cooling system further includes a first control component, and the first control component has a first state; in the first state, the first outlet 103 communicates with the fifth interface 401, and the sixth interface 402 communicates with the first interface 301 to form a first branch.

[0124] Specifically, as Figure 2 shown, when the first control component in the embodiment of the present application is in the first state, the refrigerant in the battery cooling system flows out from the first outlet 103 of the compressor 1, absorbs heat in the first condenser 4 after passing through the first control component and entering the first condenser 4 from the fifth interface 401 of the first condenser 4, and then flows from the sixth interface 402 of the first condenser 4 to the first interface 301 of the heat exchanger 3, forming the first branch for the refrigerant to be transported from the compressor 1 to the heat exchanger 3. Thus, through the setting of the first branch, the battery cooling system in the embodiment of the present application effectively ensures the output flow rate of the refrigerant and significantly improves the performance of the battery cooling system.

[0125] Among them, the first control component in the embodiment of the present application may be a check valve, a connecting valve, a solenoid valve, etc., and those skilled in the art can select according to actual needs, and the present application does not make specific limitations here.

[0126] Optionally, the heat exchanger 3 further includes a third interface 303; the condenser further includes a second condenser 2, and the second condenser 2 includes a seventh interface 201 and an eighth interface 202; the first control component further has a second state; in the second state, the first outlet 103 communicates with the seventh interface 201, and the eighth interface 202 communicates with the third interface 303 to form a first branch; wherein, in the first state, the first outlet 103 is disconnected from the seventh interface 201, or the eighth interface 202 is disconnected from the third interface 303; in the second state, the first outlet 103 is disconnected from the fifth interface 401, or the sixth interface 402 is disconnected from the first interface 301.

[0127] Specifically, as Figure 3As shown, when the first control component in the embodiment of the present application is in the second state, the refrigerant in the battery cooling system flows out from the first outlet 103 of the compressor 1, enters the second condenser 2 through the seventh interface 201 of the second condenser 2 after passing through the first control component to absorb heat, and then flows from the eighth interface 202 of the second condenser 2 to the third interface 303 of the heat exchanger 3, forming a first branch for the refrigerant to be transported from the compressor 1 to the heat exchanger 3. In this way, through the setting of the first branch in the embodiment of the present application, the output flow rate of the refrigerant is effectively ensured, and the service performance of the battery cooling system is significantly improved.

[0128] Among them, the first control component in the embodiment of the present application includes a first three-way valve. For example, the first three-way valve is a one-in-two-out three-way flow regulating valve.

[0129] Thus, in the first state, the first three-way valve connects the first outlet 103 with the fifth interface 401. The refrigerant flowing out from the first outlet 103 of the compressor 1 enters the first condenser 4 through the fifth interface 401 of the first condenser 4 after passing through the first three-way valve to absorb heat. At this time, the first three-way valve disconnects the first outlet 103 from the seventh interface 201, and the refrigerant flowing out from the first outlet 103 of the compressor 1 cannot enter the second condenser 2 through the seventh interface 201 of the second condenser 2 to absorb heat; in the second state, the first three-way valve connects the first outlet 103 with the seventh interface 201. The refrigerant flowing out from the first outlet 103 of the compressor 1 enters the second condenser 2 through the seventh interface 201 of the second condenser 2 after passing through the first three-way valve to absorb heat. At this time, the first three-way valve disconnects the first outlet 103 from the fifth interface 401, and the refrigerant flowing out from the first outlet 103 of the compressor 1 cannot enter the first condenser 4 through the fifth interface 401 of the first condenser 4 to absorb heat.

[0130] Furthermore, through the setting of the first three-way valve in the embodiment of the present application, the working condition switching of the battery cooling system is effectively realized, and the service performance of the battery cooling system is significantly improved.

[0131] In addition, in the first state, the first control component can also disconnect the eighth interface 202 from the third interface 303, so that the refrigerant flowing out from the eighth interface 202 of the second condenser 2 cannot be transported to the heat exchanger 3; or, in the second state, the first control component can also disconnect the sixth interface 402 from the first interface 301, so that the refrigerant flowing out from the sixth interface 402 of the first condenser 4 cannot be transported to the heat exchanger 3.

[0132] Among them, in order to enable the first control component to disconnect the eighth interface 202 from the third interface 303 and enable the first control component to disconnect the sixth interface 402 from the first interface 301, the first control component in the embodiment of the present application may further include a fourth one-way valve and a fifth one-way valve. The fourth one-way valve is disposed between the eighth interface 202 and the third interface 303, and the fifth one-way valve is disposed between the sixth interface 402 and the first interface 301.

[0133] Of course, in the embodiment of the present application, a communication valve or a solenoid valve may also be provided between the eighth interface 202 and the third interface 303, and between the sixth interface 402 and the first interface 301. Those skilled in the art can select according to actual needs, and the present application does not make specific limitations here.

[0134] Optionally, the first control component includes a first solenoid valve 9 and a seventh solenoid valve 14. The first solenoid valve 9 is disposed between the first outlet 103 and the seventh interface 201, and the seventh solenoid valve 14 is disposed between the first outlet 103 and the fifth interface 401. In the first state, the first solenoid valve 9 is closed and the seventh solenoid valve 14 is open. In the second state, the first solenoid valve 9 is open and the seventh solenoid valve 14 is closed.

[0135] Specifically, as Figures 1 to 3 shown, the first control component in the embodiment of the present application may further include a first solenoid valve 9 and a seventh solenoid valve 14. The first solenoid valve 9 is disposed between the first outlet 103 and the seventh interface 201 to control the on / off between the first outlet 103 and the seventh interface 201. The seventh solenoid valve 14 is disposed between the first outlet 103 and the fifth interface 401 to control the on / off between the first outlet 103 and the fifth interface 401.

[0136] Thus, in the first state, the first solenoid valve 9 is closed and the seventh solenoid valve 14 is open. The refrigerant flowing out from the first outlet 103 of the compressor 1 enters the first condenser 4 through the fifth interface 401 of the first condenser 4 after passing through the seventh solenoid valve 14 to absorb heat. At this time, since the first solenoid valve 9 is closed, the refrigerant flowing out from the first outlet 103 of the compressor 1 cannot enter the second condenser 2 through the seventh interface 201 of the second condenser 2 to absorb heat. In the second state, the first solenoid valve 9 is open and the seventh solenoid valve 14 is closed. The refrigerant flowing out from the first outlet 103 of the compressor 1 enters the second condenser 2 through the seventh interface 201 of the second condenser 2 after passing through the first solenoid valve 9 to absorb heat. At this time, since the seventh solenoid valve 14 is closed, the refrigerant flowing out from the first outlet 103 of the compressor 1 cannot enter the first condenser 4 through the fifth interface 401 of the first condenser 4 to absorb heat.

[0137] Furthermore, through the settings of the first solenoid valve 9 and the seventh solenoid valve 14 in the embodiments of the present application, the working condition switching of the battery cooling system is effectively realized, and the service performance of the battery cooling system is significantly improved.

[0138] Optionally, the compressor 1 further includes a second inlet 102; the heat exchanger 3 further includes a second interface 302; the second interface 302 communicates with the second inlet 102 to form a second branch.

[0139] Specifically, as Figures 1 to 3 shown, the refrigerant in the battery cooling system in the embodiments of the present application can flow out from the second interface 302 of the heat exchanger 3 and then flow back to the compressor 1 from the second inlet 102, forming a second branch for the refrigerant to flow back from the heat exchanger 3 to the compressor 1.

[0140] Thus, since the second inlet 102 of the compressor 1 is the medium-pressure area of the compressor 1, through the setting of the second branch in the embodiments of the present application, the gas injection and enthalpy increase of the refrigerant in the compressor 1 are effectively realized, and the circulation amount of the refrigerant and the working performance of the battery cooling system are significantly improved.

[0141] Among them, in the embodiments of the present application, an eighth solenoid valve 8 can also be provided in the second branch to realize the control of the on-off between the second interface 302 and the second inlet 102.

[0142] For example, when the battery cooling system is in the battery module cooling condition, the passenger compartment heating and battery module cooling condition, or the passenger compartment heating and battery module heating condition, since the enthalpy injection effect of the heat exchanger 3 is good, the eighth solenoid valve 8 can be opened, so that the refrigerant flowing out from the second interface 302 of the heat exchanger 3 can flow back to the medium-pressure area of the compressor 1 from the second inlet 102 of the compressor 1 through the eighth solenoid valve 8, thereby effectively achieving the gas injection and enthalpy increase of the refrigerant in the compressor 1.

[0143] In addition, the battery cooling system described in the embodiment of the present application can also be in the passenger compartment cooling and battery cooling condition. At this time, since the enthalpy injection effect of the heat exchanger 3 is poor, the eighth solenoid valve 8 can be closed, so that the refrigerant flowing out from the second interface 302 of the heat exchanger 3 cannot flow back to the medium-pressure area of the compressor 1, so as to avoid the situation that the refrigerant flowing out from the heat exchanger 3 cannot cool down the battery module 5, thereby resulting in poor performance of the battery cooling system.

[0144] Of course, in the embodiment of the present application, the second check valve 26 can also be set to connect the second interface 302 and the second inlet 102 to improve the refrigerant flow performance between the second interface 302 and the second inlet 102. At this time, the battery cooling system does not include the passenger compartment cooling and battery cooling condition; or, in the embodiment of the present application, the eighth solenoid valve 8 and the second check valve 26 can also be set at the same time to further improve the performance of the battery cooling system.

[0145] Optionally, the compressor 1 includes a first inlet 101; the heat exchanger 3 includes a third interface 303; the battery module 5 includes a first end 501 and a second end 502; the battery cooling system further includes a second control component, and the second control component has a third state; in the third state, the third interface 303 is connected to the first end 501, and the second end 502 is connected to the first inlet 101 to form a third branch.

[0146] Specifically, as Figure 2 shown, when the second control component in the embodiment of the present application is in the third state, the refrigerant in the battery cooling system flows out from the third interface 303 of the heat exchanger 3, passes through the second control component, enters the battery module 5 from the first end 501 of the battery module 5 to cool down the battery, and then flows from the second end 502 of the battery module 5 to the first inlet 101 of the compressor 1, forming a third branch for the refrigerant to flow back from the heat exchanger 3 to the compressor 1. Thus, through the setting of the third branch in the embodiment of the present application, the temperature control of the refrigerant entering the battery module 5 is effectively achieved, and the stability and reliability of the battery module 5 are significantly improved.

[0147] Among them, the second control component described in the embodiments of the present application may be a one-way valve, a communication valve, a solenoid valve, etc., and those skilled in the art can select according to actual needs, and the present application does not make specific limitations here.

[0148] Optionally, the heat exchanger 3 further includes a first interface 301; the second control component further has a fourth state; in the fourth state, the first interface 301 is communicated with the first end 501, and the second end 502 is communicated with the first inlet 101 to form a third branch; wherein, in the third state, the first interface 301 is disconnected from the first end 501; in the fourth state, the third interface 303 is disconnected from the first end 501.

[0149] Specifically, as Figure 3 shown, when the second control component described in the embodiments of the present application is in the fourth state, the refrigerant in the battery cooling system flows out from the first interface 301 of the heat exchanger 3, passes through the second control component, and then enters the battery component 5 from the first end 501 of the battery component 5 to cool the battery, and then flows from the second end 502 of the battery component 5 to the first inlet 101 of the compressor 1, forming a third branch for the refrigerant to flow back from the heat exchanger 3 to the compressor 1. Thus, through the setting of the third branch in the embodiments of the present application, the temperature control of the refrigerant entering the battery component 5 is effectively realized, and the stability and reliability of the battery component 5 are significantly improved.

[0150] Among them, the second control component described in the embodiments of the present application may be a second three-way valve. For example, the second three-way valve is a one-in-two-out three-way shunt regulating valve.

[0151] Thus, in the third state, the second three-way valve connects the third interface 303 to the first end 501. The refrigerant flowing out of the third interface 303 of the heat exchanger 3 enters the battery assembly 5 through the second three-way valve from the first end 501 of the battery assembly 5 to cool the battery. At this time, the second three-way valve disconnects the first interface 301 from the first end 501, and the refrigerant flowing out of the first interface 301 cannot enter the battery assembly 5 from the first end 501 of the battery assembly 5 to cool the battery. In the fourth state, the second three-way valve connects the first interface 301 to the first end 501. The refrigerant flowing out of the first interface 301 of the heat exchanger 3 enters the battery assembly 5 through the second three-way valve from the first end 501 of the battery assembly 5 to cool the battery. At this time, the second three-way valve disconnects the third interface 303 from the first end 501, and the refrigerant flowing out of the third interface 303 cannot enter the battery assembly 5 from the first end 501 of the battery assembly 5 to cool the battery.

[0152] Furthermore, in the embodiment of the present application, by setting the second three-way valve, the working condition switching of the battery cooling system is effectively realized, and the service performance of the battery cooling system is significantly improved.

[0153] Optionally, the second control component includes a third solenoid valve 16 and a ninth solenoid valve 15. The third solenoid valve 16 is disposed between the first interface 301 and the first end 501, and the ninth solenoid valve 15 is disposed between the third interface 303 and the first end 501. In the third state, the third solenoid valve 16 is closed and the ninth solenoid valve 15 is opened. In the fourth state, the third solenoid valve 16 is opened and the ninth solenoid valve 15 is closed.

[0154] Specifically, as Figures 1 to 3 shown, the second control component in the embodiment of the present application may further include a third solenoid valve 16 and a ninth solenoid valve 15. The third solenoid valve 16 is disposed between the first interface 301 and the first end 501 to control the on-off between the first interface 301 and the first end 501. The ninth solenoid valve 15 is disposed between the third interface 303 and the first end 501 to control the on-off between the third interface 303 and the first end 501.

[0155] Thus, in the third state, the third solenoid valve 16 is closed and the ninth solenoid valve 15 is opened. The refrigerant flowing out of the third interface 303 of the heat exchanger 3 enters the battery assembly 5 from the first end 501 of the battery assembly 5 through the ninth solenoid valve 15 to cool the battery. At this time, the third solenoid valve 16 is closed, and the refrigerant flowing out of the first interface 301 cannot enter the battery assembly 5 from the first end 501 of the battery assembly 5 to cool the battery. In the fourth state, the third solenoid valve 16 is opened and the ninth solenoid valve 15 is closed. The refrigerant flowing out of the first interface 301 of the heat exchanger 3 enters the battery assembly 5 from the first end 501 of the battery assembly 5 through the third solenoid valve 16 to cool the battery. At this time, the ninth solenoid valve 15 is closed, and the refrigerant flowing out of the third interface 303 cannot enter the battery assembly 5 from the first end 501 of the battery assembly 5 to cool the battery.

[0156] Furthermore, through the settings of the third solenoid valve 16 and the ninth solenoid valve 15 in the embodiments of the present application, the working condition switching of the battery cooling system is effectively realized, and the service performance of the battery cooling system is significantly improved.

[0157] In addition, the battery cooling system in the embodiments of the present application may further include a third electronic expansion valve 19. The third electronic expansion valve 19 is arranged on the third branch to effectively throttle and cool the refrigerant flowing out of the third interface 303 of the heat exchanger 3, avoiding damage to the battery assembly 5 due to the too high temperature of the refrigerant flowing out of the third interface 303 of the heat exchanger 3.

[0158] Optionally, the battery cooling system further includes a plate heat exchanger 7. The plate heat exchanger 7 includes a ninth interface 701 and a tenth interface 702. The second control assembly further includes a fifth electronic expansion valve 23 and a fourth solenoid valve 17. In the fourth state, the first interface 301 is communicated with the ninth interface 701 through the fifth electronic expansion valve 23, and the tenth interface 702 is communicated with the first inlet 101 through the fourth solenoid valve 17 to form a fourth branch.

[0159] Specifically, as Figure 3As shown, when the second control component in the embodiment of the present application is in the fourth state, the fifth electronic expansion valve 23 is opened, the fourth solenoid valve 17 is opened, and the refrigerant in the battery cooling system flows out from the first interface 301 of the heat exchanger 3, passes through the fifth electronic expansion valve 23, and then enters the plate heat exchanger 7 from the ninth interface 701 of the plate heat exchanger 7 to cool the motor. Then, it flows out from the tenth interface 702 of the plate heat exchanger 7, passes through the fourth solenoid valve 17, and communicates with the first inlet 101 to form a fourth branch. In this way, through the setting of the fourth branch in the embodiment of the present application, the temperature control of the plate heat exchanger 7 is effectively realized, and the stability and reliability of the plate heat exchanger 7 are significantly improved.

[0160] Among them, in the embodiment of the present application, a check valve, a connecting valve, a solenoid valve, etc. can also be used to connect the first interface 301 and the ninth interface 701, and a check valve, a connecting valve, a solenoid valve, etc. can be used to connect the tenth interface 702 and the first inlet 101. Those skilled in the art can choose according to actual needs, and the present application does not make specific limitations here.

[0161] Optionally, the battery cooling system further includes a second electronic expansion valve 22; the heat exchanger 3 further includes a third interface 303 and a fourth interface 304; the third interface 303 is connected to the fourth interface 304 through the second electronic expansion valve 22.

[0162] Specifically, as Figure 2 shown, in the embodiment of the present application, the third interface 303 and the fourth interface 304 are connected through the second electronic expansion valve 22, so that the refrigerant flowing out from the third interface 303 of the heat exchanger 3 can return to the heat exchanger 3 through the fourth interface 304 again for heat absorption after throttling by the second electronic expansion valve 22. This effectively ensures that the temperature of the refrigerant flowing out from the second branch is higher than the temperature of the refrigerant flowing out from the third branch, and realizes the temperature control of the refrigerant entering the battery module 5.

[0163] Optionally, the battery cooling system further includes a second electronic expansion valve 22; the heat exchanger 3 further includes a fourth interface 304; the eighth interface 202 is connected to the fourth interface 304 through the second electronic expansion valve 22.

[0164] Specifically, as Figure 3 shown, in the embodiment of the present application, the eighth interface 202 and the fourth interface 304 are connected through the second electronic expansion valve 22, so that the refrigerant flowing out from the eighth interface 202 of the second condenser 2 can flow to the heat exchanger 3 for heat absorption after throttling by the second electronic expansion valve 22.

[0165] Thus, the battery cooling system according to the embodiment of the present application conveys refrigerant to the heat exchanger 3 through the third interface 303 and the fourth interface 304 together, effectively ensuring that the temperature of the refrigerant flowing out of the second branch is higher than the temperature of the refrigerant flowing out of the third branch, and realizing the temperature control of the refrigerant entering the battery assembly 5.

[0166] Optionally, the battery cooling system further includes a first check valve 25 and a fourth electronic expansion valve 18; in the first state, the sixth interface 402 is communicated with the first interface 301 through the first check valve 25; in the second state, the sixth interface 402 is communicated with the first interface 301 through the fourth electronic expansion valve 18.

[0167] Specifically, as Figure 2 shown, when the battery cooling system according to the embodiment of the present application is in the battery assembly cooling working condition and the first control component is in the first state, the refrigerant in the battery cooling system flows out from the first outlet 103 of the compressor 1, absorbs heat in the first condenser 4 after passing through the first control component and enters the first condenser 4 from the fifth interface 401 of the first condenser 4, and then flows from the sixth interface 402 of the first condenser 4 to the first interface 301 of the heat exchanger 3 after passing through the first check valve 25, forming a first branch for conveying the refrigerant from the compressor 1 to the heat exchanger 3.

[0168] Furthermore, through the setting of the first check valve 25 in the embodiment of the present application, the refrigerant flowing out from the first outlet 103 of the compressor 1 can flow to the heat exchanger 3 to form a first branch, effectively ensuring the output flow rate of the refrigerant and significantly improving the service performance of the battery cooling system.

[0169] In addition, as Figure 3 shown, when the battery cooling system according to the embodiment of the present application is in the passenger compartment heating and battery assembly cooling working conditions and the first control component is in the second state, the refrigerant in the battery cooling system flows out from the first interface 301 of the heat exchanger 3, absorbs heat in the first condenser 4 after passing through the fourth electronic expansion valve 18 and enters the first condenser 4 from the sixth interface 402 of the first condenser 4, and then flows from the fifth interface 401 of the first condenser 4 to the first inlet 101 of the compressor 1, forming a fifth branch for the refrigerant to flow back from the heat exchanger 3 to the compressor 1.

[0170] Wherein, when the first check valve 25 is open, the fourth electronic expansion valve 18 is closed; when the first check valve 25 is closed, the fourth electronic expansion valve 18 is open.

[0171] Furthermore, in the embodiment of the present application, by providing the fourth electronic expansion valve 18, the refrigerant flowing out from the first interface 301 of the heat exchanger 3 can flow to the first condenser 4, effectively achieving the cooling of the first condenser 4 and further improving the performance of the battery cooling system.

[0172] Optionally, the compressor 1 further includes a first inlet 101; the first control component further includes a second solenoid valve 10, which is disposed between the first inlet 101 and the fifth interface 401; in the first state, the second solenoid valve 10 is closed; in the second state, the second solenoid valve 10 is open.

[0173] Specifically, as Figure 3 shown, when the battery cooling system in the embodiment of the present application is in the working condition of heating the passenger compartment and cooling the battery assembly, and the first control component is in the second state, the refrigerant in the battery cooling system flows out from the first interface 301 of the heat exchanger 3, passes through the fourth electronic expansion valve 18, enters the first condenser 4 through the sixth interface 402 of the first condenser 4 to absorb heat, then flows out from the fifth interface 401 of the first condenser 4, and then returns to the first inlet 101 of the compressor 1 after passing through the second solenoid valve 10, forming a fifth branch for the refrigerant to flow back from the heat exchanger 3 to the compressor 1. In this way, in the embodiment of the present application, by providing the fifth branch, the cooling of the first condenser 4 is effectively achieved, and the performance of the battery cooling system is significantly improved.

[0174] Optionally, the battery cooling system further includes a sixth electronic expansion valve 24 and a tenth solenoid valve 11; both the sixth electronic expansion valve 24 and the tenth solenoid valve 11 are disposed between the second end 502 and the first inlet 101.

[0175] Specifically, as Figures 1 to 3 shown, the refrigerant flowing out from the second end 502 in the embodiment of the present application can be communicated with the first inlet 101 through the sixth electronic expansion valve 24, thereby effectively improving the control of the refrigerant flow rate from the second end 502 to the first inlet 101.

[0176] In addition, in the embodiment of the present application, the second end 502 and the first inlet 101 can also be communicated through a check valve, or the second end 502 and the first inlet 101 can be directly communicated without setting any connection valves. Those skilled in the art can choose according to actual needs, and the present application does not make specific limitations here.

[0177] In addition, through the setting of the tenth solenoid valve 11 in the embodiments of the present application, the flow rate of the refrigerant in the battery cooling system is effectively ensured, avoiding damage to the compressor 1 caused by excessive or insufficient refrigerant, and significantly improving the stability and reliability of the battery cooling system.

[0178] Of course, on the basis of meeting the circulation volume of the refrigerant, the tenth solenoid valve 11 may not be provided between the second end 502 and the first inlet 101. Those skilled in the art can make a choice according to actual needs, and the present application does not make specific limitations here.

[0179] Optionally, the battery cooling system in the embodiments of the present application has a battery module cooling condition, and the battery module cooling condition is a scenario where the vehicle immediately drives after direct current charging is completed on a highway in winter, and may also be accompanied by rapid acceleration and deceleration operations.

[0180] Specifically, as Figure 2 shown, when the battery cooling system is in the battery module cooling condition, the first condenser 4 is arranged outside the vehicle to exchange heat with the external environment. The battery module 5 serves as the low-pressure side of the battery cooling system, and the first condenser 4 serves as the high-pressure side of the battery cooling system.

[0181] At this time, the seventh solenoid valve 14, the eighth solenoid valve 8, the ninth solenoid valve 15, the tenth solenoid valve 11, the second electronic expansion valve 22, the first electronic expansion valve 20, the third electronic expansion valve 19, the sixth electronic expansion valve 24, the first one-way valve 25, the second one-way valve 26 and the third one-way valve 27 are opened.

[0182] Thus, the high-temperature and high-pressure gaseous refrigerant coming out from the first outlet 103 of the compressor 1 flows through the seventh solenoid valve 14 to the fifth interface 401 of the first condenser 4 to enter the first condenser 4 to absorb heat and become a medium-temperature and high-pressure liquid refrigerant. The medium-temperature and high-pressure liquid refrigerant then flows out from the sixth interface 402 of the first condenser 4, and then flows through the first one-way valve 25 to the first interface 301 of the heat exchanger 3 to enter the heat exchanger 3 for heat exchange.

[0183] At this time, the first outlet 103, the seventh solenoid valve 14, the fifth interface 401, the sixth interface 402, the first one-way valve 25 and the first interface 301 are connected to form a first branch.

[0184] Further, the refrigerant flowing out of the heat exchanger 3 after heat exchange in the heat exchanger 3 is divided into two paths. One path of the refrigerant can flow out through the second interface 302 of the heat exchanger 3; the other path of the refrigerant can flow out through the third interface 303 of the heat exchanger 3. Among them, the temperature of the refrigerant flowing out of the second interface 302 is higher than the temperature of the refrigerant flowing out of the third interface 303.

[0185] Furthermore, the refrigerant flowing out of the second interface 302 returns to the middle pressure area of the compressor 1 through the eighth solenoid valve 8 and the second one-way valve 26 to realize gas injection and enthalpy increase for the compressor 1, effectively increasing the circulation volume of the refrigerant and significantly improving the working performance of the battery cooling system. The refrigerant flowing out of the third interface 303 is connected to the first end 501 of the battery assembly 5 through the ninth solenoid valve 15 and the third electronic expansion valve 19 to enter the battery assembly 5 to cool the battery, and then flows out from the second end 502 of the battery assembly 5, and finally returns to the first inlet 101 of the compressor 1 through the sixth electronic expansion valve 24 and the tenth solenoid valve 11 to realize the cyclic reciprocation of the refrigerant, thereby effectively ensuring the cooling of the battery assembly 5.

[0186] At this time, the second interface 302, the eighth solenoid valve 8, the second one-way valve 26 and the second inlet 102 are connected to form a second branch; the third interface 303, the ninth solenoid valve 15, the third electronic expansion valve 19, the first end 501, the second end 502, the sixth electronic expansion valve 24, the tenth solenoid valve 11 and the first inlet 101 are connected to form a third branch.

[0187] Thus, when the temperature of the battery assembly 5 is lower than the first threshold value, that is, when the ambient temperature is relatively low, the first electronic expansion valve 20 connects the second branch and the third branch, and the refrigerant flowing out of the second interface 302 flows through the eighth solenoid valve 8, the third one-way valve 27 and the first electronic expansion valve 20 to the first end 501 of the battery assembly 5, thereby realizing gas injection and enthalpy increase of the refrigerant in the third branch entering the battery assembly 5 by the second branch, effectively realizing the temperature control of the refrigerant entering the battery assembly 5, and significantly avoiding the risk of lithium deposition in the battery in the battery assembly 5 due to the relatively low temperature of the refrigerant.

[0188] In addition, in the embodiment of the present application, the refrigerant flowing out of the heat exchanger 3 is guided to the battery assembly 5 through the first electronic expansion valve 20, and the refrigerant flowing out of the heat exchanger 3 is guided to the battery assembly 5 through the third electronic expansion valve 19, which significantly avoids the risk of lithium plating of the battery caused by the too low temperature of the refrigerant entering the battery assembly 5 after throttling through the third electronic expansion valve 19, and greatly improves the reliability of the battery.

[0189] Optionally, the battery cooling system in the embodiment of the present application further has a passenger compartment heating and battery assembly cooling condition, and the passenger compartment heating and battery assembly cooling condition is a scenario where the vehicle immediately drives after completing DC charging on a highway in winter.

[0190] Specifically, as Figure 3 shown, when the battery cooling system is in the passenger compartment heating and battery assembly cooling condition, the second condenser 2 is arranged in the passenger compartment of the vehicle to perform heat exchange with the passenger compartment. The first condenser 4, the battery assembly 5 and the plate heat exchanger 7 serve as the low-pressure side, and the second condenser 2 serves as the high-pressure side.

[0191] At this time, the first solenoid valve 9, the second solenoid valve 10, the third solenoid valve 16, the fourth solenoid valve 17, the eighth solenoid valve 8, the tenth solenoid valve 11, the second electronic expansion valve 22, the first electronic expansion valve 20, the third electronic expansion valve 19, the fourth electronic expansion valve 18, the fifth electronic expansion valve 23, the sixth electronic expansion valve 24, the second one-way valve 26 and the third one-way valve 27 are opened.

[0192] Thus, the high-temperature and high-pressure gaseous refrigerant coming out of the first outlet 103 of the compressor 1 can be communicated with the seventh interface 201 of the second condenser 2 through the first solenoid valve 9, and thus enters the second condenser 2 to absorb heat and become a medium-temperature and high-pressure liquid refrigerant, and the medium-temperature and high-pressure liquid refrigerant then flows from the eighth interface 202 of the second condenser 2 to the heat exchanger 3.

[0193] At this time, the first outlet 103, the first solenoid valve 9, the seventh interface 201, the eighth interface 202 and the heat exchanger 3 are communicated to form a first branch.

[0194] Among them, the refrigerant flowing out of the eighth interface 202 is divided into two paths. One path enters the heat exchanger 3 through the third interface 303 of the heat exchanger 3 for heat exchange and then flows out of the heat exchanger 3; the other path enters the heat exchanger 3 through the second electronic expansion valve 22 from the fourth interface 304 for heat exchange and then flows out of the heat exchanger 3.

[0195] Further, the refrigerant flowing out of the heat exchanger 3 after heat exchange through the heat exchanger 3 is divided into two paths. One path of the refrigerant can flow out through the second interface 302 of the heat exchanger 3; the other path of the refrigerant can flow out through the first interface 301 of the heat exchanger 3. Among them, the temperature of the refrigerant flowing out of the second interface 302 is higher than the temperature of the refrigerant flowing out of the first interface 301.

[0196] Furthermore, the refrigerant flowing out of the second interface 302 returns to the middle pressure area of the compressor 1 through the eighth solenoid valve 8 and the second check valve 26 to achieve gas injection and enthalpy increase for the compressor 1, effectively increasing the circulation volume of the refrigerant and significantly improving the working performance of the battery cooling system. The refrigerant flowing out of the first interface 301 is connected to the first end 501 of the battery assembly 5 through the third solenoid valve 16 and the third electronic expansion valve 19 to enter the battery assembly 5 to cool the battery, and then flows out from the second end 502 of the battery assembly 5, and finally returns to the first inlet 101 of the compressor 1 through the sixth electronic expansion valve 24 and the tenth solenoid valve 11 to realize the cyclic reciprocation of the refrigerant, thereby effectively ensuring the cooling of the battery assembly 5.

[0197] At this time, the second interface 302, the eighth solenoid valve 8, the second check valve 26 and the second inlet 102 are connected to form a second branch; the first interface 301, the third solenoid valve 16, the third electronic expansion valve 19, the first end 501, the second end 502, the sixth electronic expansion valve 24, the tenth solenoid valve 11 and the first inlet 101 are connected to form a third branch.

[0198] Thus, when the temperature of the battery assembly 5 is lower than the first threshold, that is, when the ambient temperature is relatively low, the first electronic expansion valve 20 connects the second branch and the third branch, and the refrigerant flowing out of the second interface 302 flows to the first end 501 of the battery assembly 5 through the eighth solenoid valve 8, the third check valve 27 and the first electronic expansion valve 20, so as to realize the gas injection and enthalpy increase of the refrigerant in the third branch entering the battery assembly 5 by the second branch, effectively realizing the temperature control of the refrigerant entering the battery assembly 5, and significantly avoiding the risk of lithium plating in the battery in the battery assembly 5 due to the relatively low temperature of the refrigerant.

[0199] In addition, the refrigerant flowing out of the first interface 301 can also communicate with the sixth interface 402 of the first condenser 4 through the fourth electronic expansion valve 18 to enter the first condenser 4 to absorb heat from the air, and then flow out from the fifth interface 401 of the first condenser 4, and finally return to the first inlet 101 of the compressor 1 through the second solenoid valve 10, effectively realizing the cyclic reciprocation of the refrigerant, and further improving the effect of the heat exchanger 3 on the gas injection and enthalpy increase of the compressor 1, significantly increasing the refrigerant flow rate entering the compressor 1 from the fifth interface 401 of the battery assembly 5.

[0200] In addition, the refrigerant flowing out of the first interface 301 can also communicate with the ninth interface 701 of the plate heat exchanger 7 through the fifth electronic expansion valve 23 to enter the plate heat exchanger 7 to absorb heat, and then flow out from the tenth interface 702 of the plate heat exchanger 7, and finally return to the first inlet 101 of the compressor 1 through the fourth solenoid valve 17, effectively improving the heat absorption capacity of the plate heat exchanger 7 for the motor, and thus significantly enhancing the heat exchange capacity of the plate heat exchanger 7.

[0201] Optionally, the battery cooling system further includes a fifth solenoid valve 12, and the fifth solenoid valve 12 is disposed between the first outlet 103 and the second end 502.

[0202] Specifically, as Figure 1 shown, in the embodiment of the present application, through the setting of the fifth solenoid valve 12, the refrigerant flowing out of the compressor 1 can communicate with the second end 502 of the battery assembly 5 through the fifth solenoid valve 12, thereby realizing the temperature control of the refrigerant entering the battery assembly 5.

[0203] Optionally, the battery cooling system further includes an evaporator 6, the evaporator 6 is disposed in the passenger compartment, the evaporator 6 includes a third end 601 and a fourth end 602, the third end 601 communicates with the third interface 303, and the fourth end 602 communicates with the first inlet 101.

[0204] Specifically, as Figure 1 shown, in the embodiment of the present application, through the setting of the evaporator 6, the battery cooling system effectively cools the passenger compartment, significantly improving the service performance of the battery cooling system.

[0205] Optionally, the battery cooling system further includes a seventh electronic expansion valve 21, and the seventh electronic expansion valve 21 is disposed between the third end 601 and the third interface 303.

[0206] Specifically, as Figure 1As shown in the figure, in the embodiment of the present application, through the setting of the seventh electronic expansion valve 21, the throttling and temperature reduction of the refrigerant flowing out from the third interface 303 of the heat exchanger 3 are effectively achieved, avoiding damage to the evaporator 6 due to the too high temperature of the refrigerant flowing out from the third interface 303 of the heat exchanger 3, and significantly improving the stability and reliability of the battery cooling system.

[0207] Optionally, the battery cooling system further includes a sixth solenoid valve 13, and the sixth solenoid valve 13 is arranged between the fourth end 602 and the first inlet 101.

[0208] Specifically, as Figure 1 shown in the figure, in the embodiment of the present application, through the setting of the sixth solenoid valve 13, the flow rate of the refrigerant in the battery cooling system can be effectively ensured, avoiding damage to the compressor 1 caused by too much or too little refrigerant, and significantly improving the stability and reliability of the battery cooling system.

[0209] According to another embodiment of the present application, a vehicle is provided, and the vehicle includes the battery cooling system described in the embodiment of the present application.

[0210] In the above embodiments, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0211] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery cooling system, characterized in that: include: Battery assembly (5), compressor (1), condenser and heat exchanger (3); A first branch, a second branch and a third branch are provided between the heat exchanger (3) and the compressor (1), the condenser is arranged on the first branch, and the battery assembly (5) is arranged on the third branch; When the temperature of the battery assembly (5) is lower than a first threshold, the second branch is connected to the third branch to perform temperature compensation on the battery assembly (5).

2. The battery cooling system according to claim 1, characterized in that: The battery cooling system also includes a first electronic expansion valve (20); When the temperature of the battery assembly (5) is lower than a first threshold, the first electronic expansion valve (20) connects the second branch with the third branch to perform temperature compensation on the battery assembly (5).

3. The battery cooling system according to claim 2, characterized in that: The opening degree of the first electronic expansion valve (20) is inversely proportional to the temperature of the battery assembly (5).

4. The battery cooling system according to claim 1, characterized in that: The compressor (1) comprises a first outlet (103); the heat exchanger (3) comprises a first interface (301); the condenser comprises a first condenser (4), and the first condenser (4) comprises a fifth interface (401) and a sixth interface (402); The battery cooling system also includes a first control component having a first state; In a first state, the first outlet (103) is connected to the fifth interface (401), and the sixth interface (402) is connected to the first interface (301) to form a first branch.

5. The battery cooling system according to claim 4, characterized in that: The heat exchanger (3) further comprises a third interface (303); the condenser further comprises a second condenser (2), and the second condenser (2) comprises a seventh interface (201) and an eighth interface (202); The first control component also has a second state; In the second state, the first outlet (103) is connected to the seventh interface (201), and the eighth interface (202) is connected to the third interface (303) to form a first branch; In the first state, the first outlet (103) is disconnected from the seventh interface (201), or the eighth interface (202) is disconnected from the third interface (303); in the second state, the first outlet (103) is disconnected from the fifth interface (401), or the sixth interface (402) is disconnected from the first interface (301).

6. The battery cooling system according to claim 5, characterized in that: The first control component comprises a first solenoid valve (9) and a seventh solenoid valve (14), wherein the first solenoid valve (9) is arranged between the first outlet (103) and the seventh interface (201), and the seventh solenoid valve (14) is arranged between the first outlet (103) and the fifth interface (401); In a first state, the first solenoid valve (9) is closed and the seventh solenoid valve (14) is opened; In the second state, the first solenoid valve (9) is open and the seventh solenoid valve (14) is closed.

7. The battery cooling system according to claim 1, characterized in that: The compressor (1) comprises a second inlet (102); the heat exchanger (3) comprises a second interface (302); The second interface (302) is connected to the second inlet (102) to form a second branch.

8. The battery cooling system according to claim 1, characterized in that: The compressor (1) comprises a first inlet (101); the heat exchanger (3) comprises a third interface (303); the battery assembly (5) comprises a first end (501) and a second end (502); The battery cooling system also includes a second control component having a third state; In the third state, the third interface (303) is connected to the first end (501), and the second end (502) is connected to the first inlet (101) to form a third branch.

9. The battery cooling system according to claim 8, characterized in that: The heat exchanger (3) further comprises a first interface (301); The second control component also has a fourth state; In a fourth state, the first interface (301) is connected to the first end (501), and the second end (502) is connected to the first inlet (101), forming a third branch; Wherein, in the third state, the first interface (301) is disconnected from the first end (501); in the fourth state, the third interface (303) is disconnected from the first end (501).

10. The battery cooling system according to claim 9, characterized in that: The second control component comprises a third solenoid valve (16) and a ninth solenoid valve (15), wherein the third solenoid valve (16) is arranged between the first interface (301) and the first end (501), and the ninth solenoid valve (15) is arranged between the third interface (303) and the first end (501); In the third state, the third solenoid valve (16) is closed and the ninth solenoid valve (15) is opened; In the fourth state, the third solenoid valve (16) is open and the ninth solenoid valve (15) is closed.

11. The battery cooling system according to claim 9, characterized in that: The battery cooling system further comprises a plate heat exchanger (7), wherein the plate heat exchanger (7) comprises a ninth interface (701) and a tenth interface (702); The second control assembly further comprises a fifth electronic expansion valve (23) and a fourth solenoid valve (17); In the fourth state, the first interface (301) is connected to the ninth interface (701) through the fifth electronic expansion valve (23), and the tenth interface (702) is connected to the first inlet (101) through the fourth solenoid valve (17) to form a fourth branch.

12. The battery cooling system according to claim 4, characterized in that: The battery cooling system also includes a second electronic expansion valve (22); The heat exchanger (3) further comprises a third interface (303) and a fourth interface (304), wherein the third interface (303) is in communication with the fourth interface (304) via the second electronic expansion valve (22).

13. The battery cooling system according to claim 5, characterized in that: The battery cooling system also includes a second electronic expansion valve (22); The heat exchanger (3) further comprises a fourth interface (304), wherein the fourth interface (304) is connected to the eighth interface (202) via the second electronic expansion valve (22).

14. The battery cooling system according to claim 5, characterized in that: The battery cooling system further comprises a first one-way valve (25) and a fourth electronic expansion valve (18); In a first state, the sixth interface (402) is connected to the first interface (301) via the first one-way valve (25); In the second state, the sixth interface (402) is connected to the first interface (301) through the fourth electronic expansion valve (18).

15. The battery cooling system according to claim 14, characterized in that: The compressor (1) further comprises a first inlet (101); The first control component further comprises a second solenoid valve (10), wherein the second solenoid valve (10) is arranged between the first inlet (101) and the fifth interface (401); In the first state, the second solenoid valve (10) is closed; In the second state, the second solenoid valve (10) is open.

16. A vehicle, characterized in that: Comprising the battery cooling system according to any one of claims 1-15.

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