Vehicle battery pack cooling system and vehicle

Abstract

The utility model provides a vehicle battery pack cooling system and a vehicle. The vehicle battery pack cooling system comprises a compressor, a refrigerant cooling device, an intermediate heat exchanger, a refrigerant expansion device, a gas-liquid separation device and a cooling plate, the middle heat exchanger is internally provided with a high-temperature runner and a low-temperature runner which are used for circulating refrigerants, the refrigerants in the high-temperature runner and the low-temperature runner can exchange heat, the cooling plate is internally provided with a cooling runner which is used for circulating the refrigerants, and the refrigerants in the cooling runner can directly exchange heat with the battery pack; the compressor, the refrigerant cooling device, the high-temperature flow channel, the refrigerant expansion device, the gas-liquid separation device and the cooling plate are sequentially communicated to form a refrigerant liquid inlet loop, and the cooling plate, the low-temperature flow channel and the compressor are sequentially communicated to form a refrigerant liquid return loop. According to the vehicle battery pack cooling system, the cooling efficiency of the battery pack can be improved, and the working stability of the battery pack can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of vehicle battery packs, and in particular to a vehicle battery pack cooling system. The utility model also relates to a vehicle equipped with the vehicle battery pack cooling system. Background Art

[0002] With the development of technology, the popularity of new energy vehicles is increasing. In new energy vehicles, the battery pack is one of the core components. It will generate heat during the discharge process. When the heat generation rate in the battery pack is greater than the heat dissipation rate, the temperature of the reactants in the battery pack will continue to rise. If the temperature rise cannot be controlled, it will cause extreme situations. Therefore, the battery pack needs to be cooled by a cooling system in the vehicle so that the battery pack can work under stable conditions.

[0003] At present, the battery pack cooling method in new energy vehicles is mainly indirect cooling with coolant, and multiple heat exchanges are required in the indirect cooling with coolant, that is, the heat of the battery pack is first transferred to the coolant, the coolant is then transferred to the refrigerant, and the refrigerant finally transfers the heat to the air. Although this method can cool the battery pack, it also has the disadvantages of more conversion times and lower cooling efficiency, which is not conducive to improving the working stability of the battery pack. Utility Model Content

[0004] In view of this, the utility model aims to provide a vehicle battery pack cooling system, so as to improve the cooling efficiency of the battery pack and help enhance the working stability of the battery pack.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A vehicle battery pack cooling system includes a compressor, a refrigerant cooling device, an intermediate heat exchanger, a refrigerant expansion device, a gas-liquid separation device and a cooling plate;

[0007] The intermediate heat exchanger has a high-temperature flow channel and a low-temperature flow channel for refrigerant to flow, and the refrigerant in the high-temperature flow channel and the low-temperature flow channel can exchange heat. The cooling plate is provided with a cooling flow channel for refrigerant to flow, and the refrigerant in the cooling flow channel can directly exchange heat with the battery pack;

[0008] The compressor, the refrigerant cooling device, the high-temperature flow channel, the refrigerant expansion device, the gas-liquid separation device and the cooling plate are connected in sequence to form a refrigerant liquid inlet circuit, and the cooling plate, the low-temperature flow channel and the compressor are connected in sequence to form a refrigerant liquid return circuit.

[0009] Furthermore, the refrigerant cooling device includes a condenser, the inlet of the condenser is connected to the outlet of the compressor, and the outlet of the condenser is connected to the inlet of the high-temperature flow channel.

[0010] Furthermore, the refrigerant cooling device also includes a cooling fan located on one side of the condenser.

[0011] Furthermore, the intermediate heat exchanger is a plate heat exchanger.

[0012] Furthermore, the refrigerant expansion device includes an electronic expansion valve, the inlet of the electronic expansion valve is connected to the outlet of the high-temperature flow channel, and the outlet of the electronic expansion valve is connected to the inlet of the gas-liquid separation device.

[0013] Furthermore, the inlet of the gas-liquid separation device is provided with a liquid inlet pipe, and the outlet of the gas-liquid separation device is provided with a liquid outlet pipe;

[0014] The liquid inlet pipe is connected to the outlet of the refrigerant expansion device, the liquid outlet pipe is connected to the inlet of the cooling plate, the outlet of the liquid inlet pipe is located at the top of the gas-liquid separation device, and the inlet of the liquid outlet pipe is located at the bottom of the gas-liquid separation device.

[0015] Furthermore, any two of the intermediate heat exchanger, the refrigerant expansion device and the gas-liquid separation device are integrated together, or the intermediate heat exchanger, the refrigerant expansion device and the gas-liquid separation device are all integrated together.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The vehicle battery pack cooling system described in the utility model, by adopting an intermediate heat exchanger and a cooling plate, can not only utilize the direct heat exchange between the refrigerant in the cooling plate and the battery pack to realize direct cooling of the battery pack by the refrigerant, but also can utilize the heat exchange between the high-temperature flow channel and the low-temperature flow channel in the intermediate heat exchanger to reduce the temperature of the refrigerant entering the refrigerant expansion device and increase the cooling capacity of the refrigerant entering the cooling plate. Therefore, through the synergistic effect of the intermediate heat exchanger and the cooling plate, the cooling efficiency of the battery pack can be improved, which is beneficial to the improvement of the working stability of the battery pack.

[0018] In addition, the refrigerant cooling device uses a condenser, which has a simple structure and mature technology, and the cooling fan can ensure the heat dissipation effect of the refrigerant in the condenser. The intermediate heat exchanger uses a plate heat exchanger, and the refrigerant expansion device uses an electronic expansion valve, which also has the advantages of simple structure and mature technology.

[0019] Secondly, on the basis that the gas-liquid separation device is located between the refrigerant expansion device and the cooling plate, the outlet of the liquid inlet pipe on the gas-liquid separation device is located at the top of the gas-liquid separation device, and the inlet of the liquid outlet pipe is located at the bottom of the gas-liquid separation device. This allows all the refrigerant entering the cooling plate to be in liquid form, which can improve the uniformity of refrigerant distribution in the cooling plate and the heat exchange efficiency, and help reduce the temperature difference between different positions of the battery pack.

[0020] In addition, by integrating part or all of the intermediate heat exchanger, the refrigerant expansion device and the gas-liquid separation device together, the overall structure of the cooling system can be made more compact, the system space occupancy can be reduced, and the layout of the cooling system in the vehicle is facilitated.

[0021] Another object of the present invention is to provide a vehicle, wherein the vehicle is provided with a battery pack and the vehicle battery pack cooling system as described above.

[0022] The vehicle described in the utility model can improve the cooling efficiency of the battery pack by providing the above-mentioned vehicle battery pack cooling system, and can also increase the balance of temperature at various positions of the battery pack, which is beneficial to improving the stability of the battery pack operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 A schematic diagram of the structure of a vehicle battery pack cooling system according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of a case where the intermediate heat exchanger described in an embodiment of the utility model adopts a plate heat exchanger;

[0026] Figure 3 It is a schematic diagram of the arrangement of the liquid inlet pipe and the liquid outlet pipe of the gas-liquid separation device according to an embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of an integrated arrangement of an intermediate heat exchanger and a refrigerant expansion device according to an embodiment of the utility model;

[0028] Figure 5 It is a schematic diagram of the integrated arrangement of the refrigerant expansion device and the gas-liquid separation device according to an embodiment of the utility model;

[0029] Figure 6 It is a schematic diagram of the integrated arrangement of the intermediate heat exchanger and the gas-liquid separation device according to an embodiment of the utility model;

[0030] Figure 7 It is a schematic diagram of the integrated arrangement of the intermediate heat exchanger, the refrigerant expansion device and the gas-liquid separation device according to an embodiment of the utility model;

[0031] Description of reference numerals:

[0032] 1. Compressor; 2. Refrigerant cooling device; 3. Condenser; 4. Cooling fan; 5. Cooling plate; 6. Intermediate heat exchanger; 7. Refrigerant expansion device; 8. Gas-liquid separation device; 9. Battery pack;

[0033] 6a, high-temperature refrigerant inlet; 6b, high-temperature refrigerant outlet; 6c, low-temperature refrigerant inlet; 6d, low-temperature refrigerant outlet; 8a, liquid inlet pipe; 8b, liquid outlet pipe;

[0034] 100. Refrigerant liquid inlet circuit; 200. Refrigerant liquid return circuit; 300. Integrated components. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0036] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Embodiment 1

[0040] The present embodiment relates to a vehicle battery pack cooling system (hereinafter referred to as the cooling system), which is applied to a new energy vehicle provided with a battery pack 9, and by adopting the cooling system, it is beneficial to improve the working stability of the battery pack 9.

[0041] In terms of overall composition, combined Figure 1 As shown in , the cooling system of this embodiment is composed of a compressor 1, a refrigerant cooling device 2, an intermediate heat exchanger 6, a refrigerant expansion device 7, a gas-liquid separation device 8 and a cooling plate 5.

[0042] The intermediate heat exchanger 6 has a high temperature flow channel and a low temperature flow channel for the refrigerant to flow, and the refrigerant in the high temperature flow channel and the low temperature flow channel in the intermediate heat exchanger 6 can exchange heat. A cooling flow channel for the refrigerant to flow is also provided in the cooling plate 5, and the refrigerant in the cooling flow channel can directly exchange heat with the battery pack 9.

[0043] In addition, the above-mentioned compressor 1, the refrigerant cooling device 2, the high-temperature flow channel in the intermediate heat exchanger 6, the refrigerant expansion device 7, the gas-liquid separation device 8 and the cooling plate 5 are connected in sequence to form a refrigerant liquid inlet circuit 100, and the above-mentioned cooling plate 5, the low-temperature flow channel in the intermediate heat exchanger 6 and the compressor 1 are connected in sequence to form a refrigerant liquid return circuit 200.

[0044] Moreover, the refrigerant compressed by the compressor 1 enters the cooling plate 5 through the above-mentioned refrigerant liquid inlet circuit 100 to exchange heat with the battery pack 9 to cool the battery pack 9. The refrigerant after cooling the battery pack 9 returns to the compressor 1 through the above-mentioned refrigerant liquid return circuit 200, thus forming a working cycle of the refrigerant.

[0045] Therefore, as set above, this embodiment adopts the intermediate heat exchanger 6 and the cooling plate 5, and can utilize the direct heat exchange between the refrigerant in the cooling plate 5 and the battery pack 9 to realize the direct cooling of the refrigerant to the battery pack 9. At the same time, the heat exchange between the refrigerant in the high-temperature flow channel and the low-temperature flow channel in the intermediate heat exchanger 6 can also be utilized to reduce the temperature of the refrigerant entering the refrigerant expansion device 7, and the refrigeration capacity of the refrigerant entering the cooling plate 5 can be increased.

[0046] Based on the overall introduction above, specifically, the refrigerant in the cooling channel of the above-mentioned cooling plate 5 can directly exchange heat with the battery pack 9, that is, compared with the indirect heat exchange between the refrigerant and the battery pack 9 through the coolant, as described above, the refrigerant can directly exchange heat with the battery pack 9, thereby eliminating the intermediate medium of the coolant and improving the cooling efficiency.

[0047] In addition, the compressor 1 in this embodiment can generally adopt the electronic compressor commonly used in existing new energy vehicles, which has the advantages of simple structure, high efficiency and energy saving, stable operation, low noise and high control accuracy.

[0048] In addition, as a preferred implementation form, the refrigerant cooling device 2 may include, for example, a condenser 3, which may also be a conventional product in an existing vehicle thermal management system, and the inlet of the condenser 3 is connected to the outlet of the compressor 1, and the outlet is connected to the inlet of the high-temperature flow channel in the intermediate heat exchanger 6. At the same time, as a further preferred implementation form, the refrigerant cooling device 2 of this embodiment may also include a cooling fan 4 located on one side of the condenser 3.

[0049] The above-mentioned cooling fan 4 can also adopt conventional fan products in existing vehicles, and it can be understood that the refrigerant cooling device 2 adopts the condenser 3, which also has the advantages of simple structure and mature technology. By further arranging the cooling fan 4, the heat dissipation effect of the refrigerant in the condenser 3 can be guaranteed to better meet the cooling requirements of the battery pack 9.

[0050] In this embodiment, in a specific implementation, as a feasible implementation form, the intermediate heat exchanger 6 can be a plate heat exchanger, and an example of the plate heat exchanger can be as follows: Figure 2 As shown in . At this time, the intermediate heat exchanger 6 adopts a plate heat exchanger, which has the advantages of simple structure and mature technology. In addition, in the plate heat exchanger as the intermediate heat exchanger 6, the refrigerant from the refrigerant cooling device 2 enters through the high-temperature refrigerant inlet 6a and flows out from the high-temperature refrigerant outlet 6b, while the refrigerant from the cooling plate 5 enters from the low-temperature refrigerant inlet 6c and flows out from the low-temperature refrigerant outlet 6d.

[0051] Among them, in the plate heat exchanger, the portion between the high-temperature refrigerant inlet 6a and the high-temperature refrigerant outlet 6b is the high-temperature flow channel in the intermediate heat exchanger 6, and similarly, the portion between the low-temperature refrigerant inlet 6c and the low-temperature refrigerant outlet 6d is the low-temperature flow channel in the intermediate heat exchanger 6. At the same time, in the plate heat exchanger, the high-temperature flow channel and the low-temperature flow channel are separated by the stacked heat exchanger laminations, and the refrigerants in the high-temperature flow channel and the low-temperature flow channel also exchange heat through the above-mentioned heat exchanger laminations.

[0052] In this embodiment, when implemented specifically, as a preferred implementation form, the above-mentioned refrigerant expansion device 7 may, for example, include an electronic expansion valve, and the inlet of the electronic expansion valve is connected to the outlet of the high-temperature flow channel in the intermediate heat exchanger 6, and the outlet of the electronic expansion valve is connected to the inlet of the gas-liquid separation device 8.

[0053] It is understandable that the refrigerant expansion device 7 uses an electronic expansion valve, which also has the advantages of simple structure and mature technology. However, it should be noted that in addition to using an electronic expansion valve, other expansion valve products that meet the use requirements can also be used.

[0054] In this embodiment, a liquid inlet pipe 8a is provided at the inlet of the gas-liquid separation device 8, and a liquid outlet pipe 8b is provided at the outlet of the gas-liquid separation device 8. The liquid inlet pipe 8a is connected to the refrigerant expansion device 7, that is, the outlet of the electronic expansion valve, and the liquid outlet pipe 8b is connected to the inlet of the cooling plate 5.

[0055] In addition, in the specific implementation, the gas-liquid separation device 8 can adopt, for example, an existing common gas-liquid separator product. However, based on the existing gas-liquid separator product, as a preferred implementation form, continue as follows Figure 3 As shown in , this embodiment further enables the outlet of the liquid inlet pipe 8a to be located at the top of the gas-liquid separation device 8, and enables the inlet of the liquid outlet pipe 8b to be located at the bottom of the gas-liquid separation device 8.

[0056] Therefore, on the basis that the gas-liquid separation device 8 is located between the refrigerant expansion device 7 and the cooling plate 5, by making the outlet of the liquid inlet pipe 8a on the gas-liquid separation device 8 located at the top of the gas-liquid separation device 8, and the inlet of the liquid outlet pipe 8b located at the bottom of the gas-liquid separation device 8, the refrigerant entering the cooling plate 5 can be completely liquid, which can improve the uniformity of the distribution of the refrigerant in the cooling plate 5 and the heat exchange efficiency, and thus help to reduce the temperature difference between different positions of the battery pack 9.

[0057] If the temperature distribution at different positions of the battery pack 9 is uneven, the temperature of some battery cells or areas will be too high or too low, which will in turn cause the reaction rate of the battery cells to change, the electrolyte activity to decrease, the performance of the electrode material to decrease, etc., thereby causing problems such as reduced capacity of the battery pack 9, reduced discharge rate, and reduced efficiency of the battery pack 9.

[0058] In this embodiment, in specific implementation, the cooling plate 5 can also adopt the existing conventional structure, and in the vehicle, the cooling plate 5 can generally be arranged in the shell of the battery pack 9 to better exchange heat with the modules in the battery pack 9 and other electrical components that need to be cooled. However, based on the structural design of the battery pack 9 itself, on the basis of meeting the cooling requirements of the battery pack 9, the cooling plate 5 is arranged in the vehicle in other ways, and the refrigerant therein is directly heat exchanged with the battery pack 9. This is of course also possible, and will not be repeated here.

[0059] Continue as Figure 4As shown in , in this embodiment, as a preferred implementation form, in the specific setting, for example, the intermediate heat exchanger 6 and the refrigerant expansion device 7 can be integrated together. At this time, the integrated setting of the intermediate heat exchanger 6 and the refrigerant expansion device 7, for example, can make the two share a shell structure, or make the two be located on the same installation foundation to form an integrated component 300. And through the integrated component 300, the intermediate heat exchanger 6 and the refrigerant expansion device 7 can be arranged in the vehicle at the same time by using the above-mentioned shared shell structure or installation foundation.

[0060] In this embodiment, in addition to integrating the intermediate heat exchanger 6 and the refrigerant expansion device 7 together, of course, Figures 5 to 7 As shown in the figure, the refrigerant expansion device 7 and the gas-liquid separation device 8 can also be integrated together, or the intermediate heat exchanger 6 and the gas-liquid separation device 8 can be integrated together, or the intermediate heat exchanger 6, the refrigerant expansion device 7 and the gas-liquid separation device 8 can be integrated together, so that they also form an integrated component 300.

[0061] At this time, when the refrigerant expansion device 7 and the gas-liquid separation device 8 are integrated, and when the intermediate heat exchanger 6, the refrigerant expansion device 7 and the gas-liquid separation device 8 are integrated, they can also be a common shell structure, or be arranged on the same installation basis. Moreover, it can be understood that by integrating part or all of the intermediate heat exchanger 6, the refrigerant expansion device 7 and the gas-liquid separation device 8 together, this embodiment can make the overall structure of the cooling system more compact, reduce the space occupied by the system, and thus facilitate the arrangement of the cooling system in the vehicle.

[0062] It is worth noting that in the cooling system of this embodiment, the compressor 1, the refrigerant cooling device 2, the intermediate heat exchanger 6, the refrigerant expansion device 7, the gas-liquid separation device 8 and the cooling plate 5 can be connected by a pipeline structure that meets the refrigerant circulation requirements.

[0063] During operation, in the refrigerant liquid inlet circuit 100, after being compressed by the compressor 1, the refrigerant is in a high-pressure state. Then, the refrigerant releases heat to the outside at the refrigerant cooling device 2 and becomes liquid. Then, the refrigerant flows through the high-temperature flow channel in the intermediate heat exchanger 6, and further reduces the temperature by heat exchange with the refrigerant in the low-temperature flow channel in the intermediate heat exchanger 6. Then, the refrigerant passes through the refrigerant expansion device 7, and the high-pressure refrigerant undergoes an isenthalpic pressure drop process and becomes a gas-liquid mixed state. Then, the mixed refrigerant passes through the gas-liquid separation device 8. After separation in the gas-liquid separation device 8, the liquid refrigerant enters the cooling plate 5, and the gaseous refrigerant flows back to the compressor 1.

[0064] The refrigerant entering the cooling channel of the cooling plate 5 fully absorbs the heat of the battery pack 9 and evaporates. Then, in the refrigerant return loop 200, the refrigerant after absorbing heat in the cooling plate 5 enters the low-temperature channel of the intermediate heat exchanger 6 and exchanges heat with the refrigerant in the high-temperature channel of the intermediate heat exchanger 6. The refrigerant in the low-temperature channel of the intermediate heat exchanger 6 is in a gaseous state after heat exchange with the refrigerant in the high-temperature channel, and finally returns to the compressor 1 to complete the working cycle.

[0065] The cooling system of the present embodiment adopts the above structure. On the one hand, it can utilize the direct heat exchange between the refrigerant in the cooling plate 5 and the battery pack 9 to realize direct cooling of the battery pack 9 by the refrigerant. On the other hand, it can also utilize the heat exchange between the refrigerant in the high-temperature flow channel and the low-temperature flow channel in the intermediate heat exchanger 6 to reduce the temperature of the refrigerant entering the refrigerant expansion device 7 and increase the refrigeration capacity of the refrigerant entering the cooling plate 5. In addition, the arrangement of the inlet and outlet pipes in the gas-liquid separation device 8 can be used to increase the uniformity of the refrigerant in the cooling plate 5.

[0066] Therefore, this embodiment can improve the cooling efficiency of the battery pack 9 and increase the temperature uniformity between different positions of the battery pack 9 through the synergistic effect of the intermediate heat exchanger 6, the gas-liquid separation device 8 and the cooling plate 5. It can not only quickly dissipate the waste heat generated by the battery pack 9, but also ensure the temperature balance of each position of the battery pack 9, which is beneficial to improving the working stability of the battery pack 9.

[0067] Embodiment 2

[0068] This embodiment relates to a vehicle, in which a battery pack 9 is provided, and the vehicle battery pack cooling system of the first embodiment is also provided.

[0069] Among them, the arrangement of the compressor 1, condenser 3, cooling fan 4, partially or fully integrated intermediate heat exchanger 6, refrigerant expansion device 7 and gas-liquid separation device 8 in the above-mentioned vehicle battery pack cooling system, as well as the arrangement of the cooling plate 5 at the battery pack 9, etc., all refer to the arrangement of related components in existing new energy vehicle models, and can be arranged in a conventional form.

[0070] In addition, the vehicle of this embodiment can improve the cooling efficiency of the battery pack 9 by setting the vehicle battery pack cooling system in Example 1, and can also increase the balance of temperature at various positions of the battery pack 9, which is beneficial to improving the working stability of the battery pack 9 and has good practicality.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle battery pack cooling system, characterized in that: It comprises a compressor (1), a refrigerant cooling device (2), an intermediate heat exchanger (6), a refrigerant expansion device (7), a gas-liquid separation device (8) and a cooling plate (5); The intermediate heat exchanger (6) has a high-temperature flow channel and a low-temperature flow channel for refrigerant to circulate, and the refrigerant in the high-temperature flow channel and the low-temperature flow channel can exchange heat. The cooling plate (5) is provided with a cooling flow channel for refrigerant to circulate, and the refrigerant in the cooling flow channel can directly exchange heat with the battery pack (9); The compressor (1), the refrigerant cooling device (2), the high-temperature flow channel, the refrigerant expansion device (7), the gas-liquid separation device (8) and the cooling plate (5) are connected in sequence to form a refrigerant liquid inlet circuit (100), and the cooling plate (5), the low-temperature flow channel and the compressor (1) are connected in sequence to form a refrigerant liquid return circuit (200).

2. The vehicle battery pack cooling system according to claim 1, characterized in that: The refrigerant cooling device (2) comprises a condenser (3), the inlet of the condenser (3) being connected to the outlet of the compressor (1), and the outlet of the condenser (3) being connected to the inlet of the high-temperature flow channel.

3. The vehicle battery pack cooling system according to claim 2, characterized in that: The refrigerant cooling device (2) further comprises a cooling fan (4) located on one side of the condenser (3).

4. The vehicle battery pack cooling system according to claim 1, characterized in that: The intermediate heat exchanger (6) is a plate heat exchanger.

5. The vehicle battery pack cooling system according to claim 1, characterized in that: The refrigerant expansion device (7) comprises an electronic expansion valve, the inlet of the electronic expansion valve is connected to the outlet of the high-temperature flow channel, and the outlet of the electronic expansion valve is connected to the inlet of the gas-liquid separation device (8).

6. The vehicle battery pack cooling system according to claim 1, characterized in that: The inlet of the gas-liquid separation device (8) is provided with a liquid inlet pipe (8a), and the outlet of the gas-liquid separation device (8) is provided with a liquid outlet pipe (8b); The liquid inlet pipe (8a) is connected to the outlet of the refrigerant expansion device (7), and the liquid outlet pipe (8b) is connected to the inlet of the cooling plate (5), and the outlet of the liquid inlet pipe (8a) is located at the top of the gas-liquid separation device (8), and the inlet of the liquid outlet pipe (8b) is located at the bottom of the gas-liquid separation device (8).

7. The vehicle battery pack cooling system according to any one of claims 1 to 6, characterized in that: Any two of the intermediate heat exchanger (6), the refrigerant expansion device (7) and the gas-liquid separation device (8) are integrated together, or the intermediate heat exchanger (6), the refrigerant expansion device (7) and the gas-liquid separation device (8) are all integrated together.

8. A vehicle, characterized in that: The vehicle is provided with a battery pack (9) and a vehicle battery pack cooling system according to any one of claims 1 to 7.

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