Vehicle thermal management system and vehicle

Abstract

The utility model discloses a vehicle heat management system and a vehicle, the vehicle heat management system is internally provided with a refrigerant, the refrigerant is determined to be a second type or a third type according to the flammability classification of GB / T 7778-2017, and the vehicle heat management system comprises a refrigerant circulation flow path, a heat exchange flow path, a heat exchange flow path and a heat exchange flow path, a compressor, a first heat exchanger, a first switch valve, a liquid storage device, a first electronic expansion valve and a second heat exchanger are sequentially arranged on the refrigerant circulation flow path, the first heat exchanger is connected with a refrigerant outlet of the compressor, and the second heat exchanger is connected with a refrigerant inlet of the compressor. Wherein the first heat exchanger is used for exchanging heat with a high-temperature heat source, the second heat exchanger is used for exchanging heat with a low-temperature heat source, and the first switch valve and the first electronic expansion valve are in a closed state in a power-off state. Therefore, the vehicle heat management system is divided into a plurality of sections, even if the refrigerant in one section leaks, the refrigerant in other sections can still be stored, the refrigerant leakage amount is reduced, and the risk of fire blast is reduced.

Description

Technical Field

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

[0002] Currently, vehicles regulate the temperature of the passenger compartment through air conditioning systems.

[0003] In the related art, if flammable and explosive refrigerants (such as R290, etc.) are used in the air-conditioning system, there will be safety hazards. It is necessary to reduce the amount of refrigerant leakage in the vehicle thermal management system when an accident occurs in the vehicle to improve the safety of the vehicle. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a vehicle thermal management system, which has high safety.

[0005] The application also proposes a vehicle.

[0006] A vehicle thermal management system, wherein a refrigerant is provided in the vehicle thermal management system, wherein the refrigerant is a refrigerant determined as Class 2 or Class 3 according to the flammability classification of GB / T7778-2017, and the vehicle thermal management system comprises: a refrigerant circulation flow path, wherein a compressor, a first heat exchanger, a first switch valve, a liquid reservoir, a first electronic expansion valve and a second heat exchanger are sequentially provided on the refrigerant circulation flow path, wherein the first heat exchanger is connected to the refrigerant outlet of the compressor, and the second heat exchanger is connected to the refrigerant inlet of the compressor; wherein the first heat exchanger is used for exchanging heat with a high-temperature heat source, and the second heat exchanger is used for exchanging heat with a low-temperature heat source, and the first switch valve and the first electronic expansion valve are in a closed state when the power is off.

[0007] In the present application, when a vehicle collides, the valve structure (i.e., the first switch valve, the first solenoid valve) in the vehicle thermal management system can be controlled to be powered off to close the valve structure, and the system can be divided into several sections through the valve structure. Even if the refrigerant in one or more sections leaks, the refrigerant in other sections can still be kept in the system, thereby reducing the amount of refrigerant leakage in the vehicle thermal management system and reducing the risk of explosion. Among them, the valve structure can be in a closed state (i.e., the refrigerant cannot pass through) when the power is off, which can prevent the problem of the refrigerant circulation flow path being unable to be cut off due to the failure of the vehicle thermal management system control, and can further improve the safety of the vehicle thermal management system.

[0008] In some embodiments of the present application, the refrigerant circulation circuit is also provided with a second switch valve, which is arranged between the compressor and the first heat exchanger and is used to control the on and off state of the compressor and the first heat exchanger, and the second switch valve is in a closed state when the power is off.

[0009] In some embodiments of the present application, the refrigerant circulation circuit also includes a heat exchange branch, which is connected between the refrigerant outlet of the compressor and the second heat exchanger, and a second electronic expansion valve is provided on the heat exchange branch.

[0010] In some embodiments of the present application, the second electronic expansion valve is configured to be in a closed state in a power-off state.

[0011] In some embodiments of the present application, the refrigerant circulation circuit is also provided with a third switch valve, which is arranged between the second heat exchanger and the compressor and is used to control the on and off state of the compressor and the second heat exchanger, and the third switch valve is in a closed state when the power is off.

[0012] In some embodiments of the present application, the refrigerant circulation circuit is further provided with a third heat exchanger, which is provided between the liquid reservoir and the first electronic expansion valve and is used to cool the refrigerant.

[0013] In some embodiments of the present application, the refrigerant is R290.

[0014] A vehicle according to an embodiment of the second aspect of the present application includes the above-mentioned vehicle thermal management system.

[0015] In some embodiments of the present application, the vehicle further includes a control device, which is connected to the vehicle thermal management system and is used to control the power-on status of the first switch valve and the first electronic expansion valve.

[0016] In some embodiments of the present application, the vehicle further comprises a concentration sensor, the concentration sensor being connected to the control device and used to detect a refrigerant leakage state of the vehicle thermal management system;

[0017] And / or, the vehicle further includes a collision sensor, which is connected to the control device and is used to detect a collision state of the vehicle.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a vehicle thermal management system according to an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of a thermal management method according to an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of a vehicle according to an embodiment of the present application.

[0023] Reference numerals:

[0024] Vehicles 1000;

[0025] Vehicle thermal management system 100; concentration sensor 200; collision sensor 300; control device 400;

[0026] Refrigerant circulation circuit 101; heat exchange branch circuit 102;

[0027] Compressor 1; refrigerant inlet 11; refrigerant outlet 12;

[0028] A first heat exchanger 2; a second heat exchanger 3; a third heat exchanger 4;

[0029] A first switch valve 51; a second switch valve 52; a third switch valve 53;

[0030] A first electronic expansion valve 61 ; a second electronic expansion valve 62 ; and a liquid storage tank 7 . DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] Reference below Figure 1-Figure 3 A vehicle thermal management system 100 according to an embodiment of the present application is described.

[0033] The vehicle thermal management system 100 according to the embodiment of the present application includes a refrigerant circulation flow path 101, on which a compressor 1, a first heat exchanger 2, a first switch valve 51, a liquid storage device 7 and a second heat exchanger 3 are sequentially arranged, the first heat exchanger 2 is connected to the refrigerant outlet 12 of the compressor 1, and the second heat exchanger 3 is connected to the refrigerant inlet 11 of the compressor 1. The refrigerant in the thermal management system is a refrigerant determined as Class 2 or Class 3 according to the flammability classification of GB / T 7778-2017.

[0034] Among them, the compressor 1 is used to compress the refrigerant, the first heat exchanger 2 is used to exchange heat with a high-temperature heat source (such as the external environment of the vehicle), and the second heat exchanger 3 is used to exchange heat with a low-temperature heat source (such as the passenger compartment, etc.). The liquid storage tank 7 can further condense the refrigerant to form a saturated liquid, thereby enhancing the heat exchange effect at the second heat exchanger 3 and cooling the passenger compartment.

[0035] When the passenger compartment needs to be cooled, the vehicle thermal management system 100 is operated, and the refrigerant is compressed by the compressor 1 and discharged as a high-temperature and high-pressure gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant condenses into a high-pressure and medium-temperature liquid refrigerant after entering the first heat exchanger 2. The refrigerant is discharged from the first heat exchanger 2 and enters the liquid reservoir 7. The liquid reservoir 7 can increase the saturation of the liquid refrigerant. The refrigerant discharged from the liquid reservoir 7 enters the second heat exchanger 3, and after flowing through the second heat exchanger 3, it returns to the compressor 1 through the refrigerant inlet 11. Among them, the refrigerant can evaporate at the second heat exchanger 3 to achieve cooling of the passenger compartment.

[0036] Reference Figure 1 The first switch valve 51 is arranged between the first heat exchanger 2 and the liquid reservoir 7. When the first switch valve 51 is closed, the refrigerant in the first heat exchanger 2 cannot enter the high-pressure liquid reservoir 7, that is, the refrigerant in the first heat exchanger 2 cannot flow to the liquid reservoir 7, which can reduce the refrigerant leakage when an accident occurs to the vehicle 1000.

[0037] In the present application, the first switch valve 51 and the first electronic expansion valve 61 are in a closed state when the power is off. Therefore, the first switch valve 51 and the first electronic expansion valve 61 can be closed by powering off, thereby cutting off the pipeline in the vehicle thermal management system 100 by only powering off the valve structure (such as the first switch valve 51, the first electronic expansion valve 61, etc.), without maintaining the power on state, which can improve the control reliability of the vehicle thermal management system 100.

[0038] It can be understood that the vehicle thermal management system 100 in the present application is applied to the vehicle 1000. When the vehicle 1000 is in a special working condition, the refrigerant leakage can be reduced by controlling the valve structure in the vehicle thermal management system 100 (such as: the first switch valve 51, the first electronic expansion valve 61, etc.) to close, thereby reducing the risk of combustion and explosion in the vehicle thermal management system 100.

[0039] Among them, the "special operating conditions" of the above-mentioned vehicle 1000 refer to operating conditions such as a collision of the vehicle 1000 or a refrigerant leakage in the vehicle thermal management system 100, including but not limited to the two operating conditions mentioned above.

[0040] Specifically, taking the collision of the vehicle 1000 as an example, if the collision of the vehicle 1000 occurs, there is a risk of causing damage to the pipelines or components in the vehicle thermal management system 100 and leakage. When the collision of the vehicle 1000 occurs, the first switch valve 51 and the first electronic expansion valve 61 can be controlled to be de-energized to close the first switch valve 51 and the first electronic expansion valve 61, which can reduce the refrigerant leakage of the vehicle thermal management system 100.

[0041] Reference Figure 1 For example, when the liquid storage tank 7 leaks, the first switch valve 51 and the first electronic expansion valve 61 are controlled to be de-energized, so that the first switch valve 51 and the first electronic expansion valve 61 are closed. At this time, only the refrigerant in the pipeline between the first switch valve 51 and the first electronic expansion valve 61 and the equipment arranged on the pipeline (such as: liquid storage tank 7, etc.) can be discharged, and the refrigerant in other pipelines and equipment (such as: first heat exchanger 2, second heat exchanger 3, compressor 1, etc.) in the refrigerant circulation flow path 101 can be stored in the system to reduce the leakage of the refrigerant.

[0042] It should be noted that currently, vehicles use air conditioning systems to adjust the temperature of the passenger compartment. In related technologies, if flammable and explosive refrigerants (such as R290, etc.) are used in the air conditioning system, there will be safety hazards. It is necessary to reduce the amount of refrigerant leakage in the vehicle thermal management system when the vehicle has an accident in order to improve the safety of the vehicle.

[0043] In the present application, when the vehicle 1000 collides, the valve structure (i.e., the first switch valve 51, the first electronic expansion valve 61) in the vehicle thermal management system 100 can be controlled to be powered off to close the valve structure, and the system can be divided into several sections by the valve structure. Even if the refrigerant in one or more sections leaks, the refrigerant in other sections can still be stored in the system, thereby reducing the amount of refrigerant leakage in the vehicle thermal management system 100 and reducing the risk of explosion. Among them, the valve structure can be in a closed state (i.e., the refrigerant cannot pass through) in the power-off state, which can prevent the problem that the refrigerant circulation flow path 101 cannot be cut off due to control failure of the vehicle thermal management system 100, and can further improve the safety of the vehicle thermal management system 100.

[0044] It is understood that when the refrigerant is classified as Class 2 or Class 3 according to the flammability classification of GB / T 7778-2017, the refrigerant is flammable. The occurrence of combustion and explosion of the vehicle 1000 and the severity of the combustion and explosion are positively correlated with the leakage of the refrigerant, that is, the higher the leakage of the flammable refrigerant, the higher the risk and severity of the combustion and explosion of the vehicle 1000.

[0045] In some embodiments of the present application, the liquid reservoir 7 is a high-pressure liquid reservoir, and the high-pressure liquid reservoir 7 can further condense the refrigerant discharged from the first heat exchanger 2 to form a saturated liquid, thereby improving the cooling effect of the vehicle thermal management system 100.

[0046] like Figure 1 As shown, in some embodiments of the present application, the refrigerant circulation flow path 101 is further provided with a second switch valve 52, which is provided between the compressor 1 and the first heat exchanger 2, and the second switch valve 52 is used to control the on-off state of the compressor 1 and the first heat exchanger 2. The second switch valve 52 is in a closed state when the power is off.

[0047] Reference Figure 1 , the second switch valve 52 is arranged between the refrigerant outlet 12 side of the compressor 1 and the first heat exchanger 2, that is, the second switch valve 52 and the first switch valve 51 are respectively arranged on both sides of the first heat exchanger 2. By controlling the first switch valve 51 and the second switch valve 52 to be closed, the first heat exchanger 2 can be arranged alone in a zone. If the first heat exchanger 2 leaks, the first switch valve 51 and the second switch valve 52 are controlled to be powered off, and only the refrigerant in the first heat exchanger 2 and the refrigerant in the pipeline between the first switch valve 51 and the second switch valve 52 in the vehicle thermal management system 100 can be discharged, and the refrigerant in other areas of the vehicle thermal management system 100 can still be retained, thereby reducing the refrigerant leakage of the vehicle thermal management system 100.

[0048] like Figure 1 As shown, in some embodiments of the present application, the refrigerant circulation flow path 101 is further provided with a third switch valve 53, which is provided between the second heat exchanger 3 and the compressor 1, and is used to control the on-off state of the compressor 1 and the second heat exchanger 3. The third switch valve 53 is in a closed state when the power is off.

[0049] Reference Figure 1, the third switch valve 53 is arranged between the refrigerant inlet 11 side of the compressor 1 and the second heat exchanger 3, that is, the third switch valve 53 and the first electronic expansion valve 61 are respectively arranged on both sides of the second heat exchanger 3. By controlling the third switch valve 53 and the first electronic expansion valve 61 to be closed, the second heat exchanger 3 can be arranged alone in a zone. If the second heat exchanger 3 leaks, the third switch valve 53 and the first electronic expansion valve 61 are controlled to be powered off, and only the refrigerant in the second heat exchanger 3 and the refrigerant in the pipeline between the third switch valve 53 and the first electronic expansion valve 61 in the vehicle thermal management system 100 can be discharged, and the refrigerant in other areas of the vehicle thermal management system 100 can still be retained, thereby reducing the refrigerant leakage of the vehicle thermal management system 100.

[0050] It is understandable that both the second switch valve 52 and the third switch valve 53 can be controlled by electrical signals. When the second switch valve 52 and the third switch valve 53 are in the power-off state, the second switch valve 52 and the third switch valve 53 are in the closed state, that is, the refrigerant cannot pass through the second switch valve 52 and the third switch valve 53.

[0051] When the valve structure (such as the first switch valve 51, the second switch valve 52, the third switch valve 53, the first electronic expansion valve 61, etc.) is in the "closed state", the flow area of ​​the valve structure is less than 1x10 -1 mm 2 .

[0052] like Figure 1 As shown, in some embodiments of the present application, the refrigerant circulation circuit 101 is further provided with a third heat exchanger 4, the third heat exchanger 4 is arranged between the liquid reservoir 7 and the first electronic expansion valve 61, and the third heat exchanger 4 is used to cool the refrigerant to reduce the temperature of the refrigerant.

[0053] The third heat exchanger 4 is configured as a subcooler. The refrigerant discharged from the liquid storage device 7 can enter the subcooler, which can further cool the saturated liquid to further reduce the temperature of the refrigerant flowing to the second heat exchanger 3, thereby improving the cooling effect of the vehicle thermal management system 100.

[0054] like Figure 1 As shown, in some embodiments of the present application, the refrigerant circulation circuit 101 also includes a heat exchange branch 102, which is connected between the refrigerant outlet 12 of the compressor 1 and the second heat exchanger 3, and a second electronic expansion valve 62 is provided on the heat exchange branch 102.

[0055] Reference Figure 1, the refrigerant discharged from the compressor 1 can flow into the heat exchange branch 102, and the refrigerant enters the second heat exchanger 3 after being throttled by the second electronic expansion valve 62, and returns to the compressor 1 through the second heat exchanger 3 to complete the cycle. When the vehicle thermal management system 100 is in the above working condition, the passenger compartment can be heated. At the same time, when the vehicle thermal management system 100 performs the above working condition, it is necessary to control the second switch valve 52 and the first electronic expansion valve 61 to be powered off.

[0056] In a further embodiment of the present application, the second electronic expansion valve 62 is configured to be in a closed state when the power is off. The second electronic expansion valve 62 can be closed by controlling the power off of the second electronic expansion valve 62.

[0057] Reference Figure 1 It can be understood that if leakage occurs at the compressor 1, the second electronic expansion valve 62, the second switch valve 52 and the third switch valve 53 are controlled to be de-energized, so that the compressor 1 can be separated into an independent section, so that only the refrigerant in the section where the compressor 1 is located is discharged, thereby reducing the refrigerant leakage in the vehicle thermal management system 100.

[0058] In some embodiments of the present application, the refrigerant is R290, i.e. propane. Propane is flammable.

[0059] Reference Figure 1 According to the vehicle thermal management system 100 of the embodiment of the present application, the valve structure (such as the first switch valve 51, the second switch valve 52, the third switch valve 53, the first electronic expansion valve 61 and the second electronic expansion valve 62) is constructed to automatically close when the power is cut off. Therefore, when the vehicle 1000 collides or a refrigerant leakage is detected, the control valve structure is powered off, and the vehicle thermal management system 100 is divided into multiple sections, so that only the refrigerant in the section where the leakage occurs is discharged, and the refrigerant in other sections can be retained in the vehicle thermal management system 100, thereby reducing the amount of refrigerant leakage, reducing the risk of combustion and explosion of the vehicle 1000, and improving the safety of the vehicle 1000.

[0060] like Figure 1As shown, the valve structure in the vehicle thermal management system 100 includes: a first switch valve 51, a second switch valve 52, a third switch valve 53, a first electronic expansion valve 61 and a second electronic expansion valve 62. Among them, by controlling the first switch valve 51 and the second switch valve 52 to be powered off, the first heat exchanger 2 can be divided into one section; by controlling the first switch valve 51 and the first electronic expansion valve 61 to be powered off, the liquid storage 7 and the third heat exchanger 4 can be divided into one section; by de-energizing the first electronic expansion valve 61, the second electronic expansion valve 62 and the third switch valve 53, the second heat exchanger 3 can be divided into one section; by closing the second switch valve 52, the third switch valve 53 and the second electronic expansion valve 62, the compressor 1 can be divided into one section. Therefore, through the coordination of multiple valve structures, four independent areas can be divided in the vehicle thermal management system 100. If a device (such as compressor 1, first heat exchanger 2, second heat exchanger 3, third heat exchanger 4, liquid reservoir 7) leaks refrigerant, the control valve structure will divide the area where the device is located, thereby reducing the amount of refrigerant leakage in the vehicle thermal management system 100.

[0061] According to the vehicle 1000 of the embodiment of the present application, the vehicle 1000 includes the above-mentioned vehicle thermal management system 100, which can reduce the refrigerant leakage amount of the vehicle thermal management system 100 when the vehicle 1000 collides or the refrigerant leaks, thereby reducing the risk of combustion and explosion of the vehicle 1000 and improving the safety of the vehicle 1000.

[0062] In some embodiments of the present application, the vehicle 1000 further includes a control device 400, which is connected to the vehicle thermal management system 100 and is used to control the power-on state of the first switch valve 51 and the first electronic expansion valve 61. When the first switch valve 51 is in the power-off state, the first switch valve 51 is closed; when the first electronic expansion valve 61 is powered off, the first electronic expansion valve 61 is closed.

[0063] In some embodiments of the present application, the vehicle 1000 also includes a concentration sensor 200, and the refrigerant concentration sensor 200 is connected to the control device 400 (e.g., electrically connected), and the concentration sensor 200 is used to detect the refrigerant leakage status of the vehicle thermal management system 100, so that the vehicle thermal management system 100 can be controlled according to the refrigerant leakage status in the vehicle thermal management system 100 to reduce the refrigerant leakage amount of the vehicle thermal management system 100.

[0064] It should be noted that the control device 400 can also control the power-on status of other valve structures in the vehicle thermal management system 100 , such as: controlling the second switch valve 52 , the third switch valve 53 and the second electronic expansion valve 62 .

[0065] It can be understood that the control device 400 can control the corresponding valve structure according to the concentration detection signal of the concentration sensor 200, so as to divide the vehicle thermal management system 100 through the valve structure, thereby separately dividing the interval where the leakage exists, thereby reducing the refrigerant leakage in the vehicle thermal management system 100.

[0066] For example: when the concentration sensor 200 detects that the refrigerant in the interval where the first heat exchanger 2 is located has leaked, the control device 400 controls the first switch valve 51 and the second switch valve 52 to cut off the power, and the first switch valve 51 and the second switch valve 52 are in a closed state. The first switch valve 51 and the second switch valve 52 can be used to divide the first heat exchanger 2 into an independent interval, and only the refrigerant in the interval where the first heat exchanger 2 is located can leak, and the refrigerant in other intervals can still be retained in the vehicle thermal management system 100, thereby reducing the amount of refrigerant leakage.

[0067] In some embodiments of the present application, the vehicle 1000 further includes a collision sensor 300 , which is connected to the control device 400 , so that the thermal management system can be controlled according to the collision state of the vehicle 1000 .

[0068] Furthermore, the control device 400 can control the power-on status of multiple valve structures in the vehicle thermal management system 100 according to the collision position of the vehicle 1000 to prevent the collision of the vehicle 1000 from causing leakage of pipes or devices in the vehicle thermal management system 100. According to the collision position of the vehicle 1000, the interval division corresponding to the area is controlled. Even if the refrigerant in the interval leaks, the refrigerant leakage of the vehicle thermal management system 100 is limited, which can reduce the risk of combustion and explosion of the vehicle 1000.

[0069] It should be noted that the control device 400 can control the vehicle thermal management system 100 in combination with the collision detection signal obtained by the collision sensor 300 and the concentration detection signal of the concentration sensor 200, so as to control the valve structure of the vehicle thermal management system 100 according to the collision situation of the vehicle 1000 and the refrigerant leakage situation, reduce refrigerant leakage, reduce the risk of combustion and explosion, and improve the safety of the vehicle 1000.

[0070] Combination Figure 1 and Figure 2 , describes a thermal management method for a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 includes a vehicle thermal management system 100 and a collision sensor 300, the vehicle thermal management system 100 includes a switch valve, an electronic expansion valve, and a concentration sensor, and the method includes: obtaining a collision state and a refrigerant leakage state of the vehicle 1000 detected by the collision sensor 300; when determining that a collision condition or refrigerant leakage occurs in the vehicle 1000 according to the collision state of the vehicle 1000, controlling the switch valve and the electronic expansion valve to close.

[0071] When vehicle 1000 collides, there is a risk of leakage of the refrigerant in the vehicle thermal management system 100. By controlling the switch valve and the electronic expansion valve to close, the vehicle thermal management system 100 can be managed in sections, and the section with leaking refrigerant can be separated separately. The refrigerant in other sections can still be retained in the vehicle thermal management system 100, thereby reducing the leakage of the refrigerant and reducing the risk of explosion of the vehicle 1000.

[0072] The thermal management method of the vehicle 1000 can be applied to the above-mentioned vehicle thermal management system 100. The thermal management method and the above-mentioned vehicle thermal management system 100 have the same advantages over the prior art, which will not be described in detail here.

[0073] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0074] In the description of the present application, “plurality” means two or more.

[0075] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A vehicle thermal management system, characterized in that: The vehicle thermal management system is provided with a refrigerant, the refrigerant being a refrigerant determined as Class 2 or Class 3 according to the flammability classification of GB / T 7778-2017, and the vehicle thermal management system comprises: A refrigerant circulation flow path, wherein a compressor, a first heat exchanger, a first switch valve, a liquid storage device, a first electronic expansion valve and a second heat exchanger are sequentially arranged on the refrigerant circulation flow path, wherein the first heat exchanger is connected to the refrigerant outlet of the compressor, and the second heat exchanger is connected to the refrigerant inlet of the compressor; The first heat exchanger is used for exchanging heat with a high-temperature heat source, the second heat exchanger is used for exchanging heat with a low-temperature heat source, and the first switch valve and the first electronic expansion valve are in a closed state when the power is off.

2. The vehicle thermal management system according to claim 1, characterized in that: The refrigerant circulation flow path is also provided with a second switch valve, which is arranged between the compressor and the first heat exchanger and is used to control the on and off state of the compressor and the first heat exchanger, and the second switch valve is in a closed state when the power is off.

3. The vehicle thermal management system according to claim 2, characterized in that: The refrigerant circulation flow path also includes a heat exchange branch, which is connected between the refrigerant outlet of the compressor and the second heat exchanger, and a second electronic expansion valve is provided on the heat exchange branch.

4. The vehicle thermal management system according to claim 3, characterized in that: The second electronic expansion valve is configured to be in a closed state in a power-off state.

5. The vehicle thermal management system according to claim 1, characterized in that: The refrigerant circulation flow path is also provided with a third switch valve, which is arranged between the second heat exchanger and the compressor and is used to control the on and off state of the compressor and the second heat exchanger, and the third switch valve is in a closed state when the power is off.

6. The vehicle thermal management system according to claim 1, characterized in that: The refrigerant circulation flow path is further provided with a third heat exchanger, which is arranged between the liquid storage tank and the first electronic expansion valve and is used to cool the refrigerant.

7. The vehicle thermal management system according to claim 1, characterized in that: The refrigerant is R290.

8. A vehicle, characterized in that: The vehicle thermal management system comprises the vehicle thermal management system according to any one of claims 1-7.

9. The vehicle according to claim 8, characterized in that It also includes a control device, which is connected to the vehicle thermal management system and is used to control the power-on state of the first switch valve and the first electronic expansion valve.

10. The vehicle according to claim 9, characterized in that The vehicle further comprises a concentration sensor, which is connected to the control device and is used to detect a refrigerant leakage state of the vehicle thermal management system; And / or, the vehicle further includes a collision sensor, which is connected to the control device and is used to detect a collision state of the vehicle.

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