Battery pack and vehicle

Abstract

The utility model relates to a battery pack and a vehicle. The battery pack comprises a shell; the plurality of battery cells are arranged in the shell; the cooling module is arranged in the shell and is used for cooling the plurality of battery cells; the liquid discharging valve is arranged in the shell in a penetrating mode and located below the cooling module, the liquid discharging valve comprises an expansion part, and the expansion part is used for sucking liquid to expand so as to open the liquid discharging valve; at least part of the blocking structure is located between the liquid discharge valve and the cooling module so as to be used for preventing condensed liquid from falling to the area where the liquid discharge valve is located from the position above the liquid discharge valve, and / or the blocking structure is used for preventing the part, located above the liquid discharge valve, of the cooling module from making contact with gas in the shell, and the blocking structure is used for blocking the condensed liquid from falling to the area where the liquid discharge valve is located. Condensed liquid is reduced. According to the technical scheme, the blocking structure can reduce generation of condensed liquid and / or reduce the possibility that the condensed liquid opens the drain valve by mistake, and sealing and use safety of the battery pack are guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and in particular, to a battery pack and a vehicle. Background Art

[0002] During the use of a vehicle, it is necessary to cool the battery pack so that it is at an appropriate operating temperature to ensure the operating efficiency. However, the coolant may corrode the cooling pipeline and cause leakage. In addition, the loosening of the cooling pipeline joint or the impact of the vehicle in an accident may cause damage to the liquid cooling system and lead to the leakage of the coolant. At this time, the accumulated coolant inside the battery pack will cause a short circuit of the battery module, and then cause the risk of thermal runaway inside the battery pack.

[0003] In the related art, the leaked coolant in the battery pack can be discharged through a drain valve. However, in the actual application process, the drain valve has the problem of abnormal valve opening. Summary of the Utility Model

[0004] The purpose of the present disclosure is to provide a battery pack and a vehicle, which can reduce the possibility of abnormal opening of the drain valve to at least partially solve the above technical problems.

[0005] To achieve the above object, according to the first aspect of the present disclosure, there is provided a battery pack, including:

[0006] A housing;

[0007] A plurality of battery cells, disposed inside the housing;

[0008] A cooling module, disposed inside the housing for cooling the plurality of battery cells;

[0009] A drain valve, passing through the housing and located below the cooling module. The drain valve includes an expansion member for sucking liquid and expanding to open the drain valve; and

[0010] A partition structure, at least partially located between the drain valve and the cooling module, for stopping the condensed liquid from falling from above the drain valve to the area where the drain valve is located, and / or for blocking the contact between the part of the cooling module above the drain valve and the gas inside the housing to reduce the generation of condensed liquid.

[0011] Optionally, the cooling module includes a liquid cooling plate and a liquid cooling pipe connected to the liquid cooling plate. The drain valve is located below the liquid cooling pipe, and the partition structure is at least partially located between the drain valve and the liquid cooling pipe and / or the liquid cooling plate.

[0012] Optionally, the barrier structure includes a coating layer, and the coating layer is attached to a portion of the cooling module located above the drain valve to isolate the portion from contact with the gas in the shell.

[0013] Optionally, the cooling module includes a liquid cooling plate and a liquid cooling pipe connected to the liquid cooling plate, the portion of the cooling module located above the drain valve includes a portion of the liquid cooling pipe, and the coating layer circumferentially coats the portion of the liquid cooling pipe.

[0014] Optionally, the covering layer includes at least one of an air barrier layer, a heat-insulating layer and a moisture-absorbing layer.

[0015] Optionally, the barrier structure further includes a liquid absorbing layer coated on the outside of the coating layer, and the liquid absorbing layer is used to absorb the condensed liquid.

[0016] Optionally, the drain valve includes a valve body, a sealing member and an elastic member, the valve body having a drain channel, the drain channel being used for allowing liquid to flow through so as to discharge the liquid from the interior of the shell, the expansion member being located in the drain channel so as to drive the sealing member to move relative to the valve body by expanding by absorbing liquid so as to open the drain channel, the elastic member being located in the drain channel and connected to the valve body and the sealing member so as to provide elastic force for the sealing member to close the drain channel, a mounting hole for connecting the elastic member is provided at the top end of the valve body, and the barrier structure includes a blocking cover, the blocking cover being located between the drain valve and the cooling module and having its projection on the drain valve covering the mounting hole.

[0017] Optionally, the blocking cover is connected to at least one of the valve body, the shell and the cooling module.

[0018] Optionally, the blocking cover includes a connecting portion connected to the valve body and a liquid blocking portion connected to the connecting portion, a liquid blocking space is formed between the connecting portion, the liquid blocking portion and the valve body, and the mounting hole is located in the liquid blocking space.

[0019] According to a second aspect of the present disclosure, a vehicle is provided, comprising the battery pack as described above.

[0020] Through the above technical solution, the partition structure can prevent the condensed liquid from falling from the cooling module to the area where the drain valve is located, so as to reduce the possibility that this part of the condensed liquid is absorbed by the expansion member and the drain valve is accidentally opened. Among them, the area where the drain valve is located can be the area / area occupied by the drain valve in its radial direction, or it can be an area within a preset range that is larger than the area occupied by the drain valve in its radial direction; in addition, the cooling module is used to cool a plurality of battery cells. Therefore, when the cooling module contacts the gas in the housing, condensed water is likely to be generated due to the large temperature difference. The partition structure can also be used to block the contact between the part of the cooling module above the drain valve and the gas in the housing, so as to reduce the generation of condensed liquid and reduce the possibility that this part of the condensed liquid is absorbed by the expansion member and the drain valve is accidentally opened.

[0021] Other features and advantages of the present disclosure will be described in detail in the following specific implementation section. Brief Description of the Drawings

[0022] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the battery pack provided in the exemplary embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of the structure of the battery cell and the liquid cooling plate of the battery pack provided in the exemplary embodiment of the present disclosure, where part of the housing is not shown;

[0025] Figure 3 is a schematic diagram of the structure of the partition structure provided in the exemplary embodiment of the present disclosure;

[0026] Figure 4 is a schematic diagram of the overall structure of the drain valve provided in the exemplary embodiment of the present disclosure;

[0027] Figure 5 is an exploded view of the drain valve provided in the exemplary embodiment of the present disclosure.

[0028] Description of the Reference Numerals

[0029] 1. Battery pack; 2. Housing; 3. Cooling module; 31. Liquid cooling plate; 32. Liquid cooling tube; 4. Drain valve; 41. Expansion member; 42. Valve body; 421. Liquid inlet; 43. Plugging member; 44. Elastic member; 45. Drain channel; 46. Mounting hole; 5. Partition structure; 51. Coating layer; 52. Liquid absorption layer; 53. Cover; 531. Connection part; 532. Liquid blocking part. Detailed Description of the Embodiment

[0030] The following is a detailed description of the specific embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not intended to limit the present disclosure.

[0031] In the present disclosure, unless otherwise stated, "inner" and "outer" refer to the inside and outside of the contour of the corresponding component; "far" and "near" refer to the far and near in the spatial position of the corresponding component relative to another component. In addition, the terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another element, and do not have an order or importance. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0032] In the related art, there is a problem of abnormal valve opening in the actual application process of the drain valve 4. The inventor's research found that the temperature difference between the cooling system inside the battery pack 1 and the surrounding environment is relatively large, so it is easy to generate condensate. This part of the condensate can also be absorbed by the expansion member 41 of the drain valve 4, resulting in the misopening of the drain valve 4, and then the problem of the sealing failure of the battery pack 1 occurs. External liquid may backflow into the battery pack 1 through the drain valve 4, causing a short circuit or even thermal failure of the battery pack 1, affecting the use safety of the battery pack 1.

[0033] For the convenience of understanding, the present disclosure first gives an exemplary description of the structure and application process of the drain valve 4. Referring to Figure 4 and Figure 5 , the drain valve 4 includes a valve body 42, a plugging member 43 and an elastic member 44. The valve body 42 has a drain channel 45 for allowing liquid to flow through to discharge the liquid from the inside of the housing 2. The expansion member 41 is located in the drain channel 45 to drive the plugging member 43 to move relative to the valve body 42 by absorbing liquid and expanding, so as to open the drain channel 45. The elastic member 44 is located in the drain channel 45 and is connected to the valve body 42 and the plugging member 43 to provide the elastic force for the plugging member 43 to close the drain channel 45. An installation hole 46 for connecting the elastic member 44 is provided at the top end of the valve body 42.

[0034] In this way, when the coolant inside the battery pack 1 leaks and flows through the bottom wall of the housing 2, and then flows into the drain channel 45 through the liquid inlet 421 provided on the valve body 42, the expansion member 41 absorbs liquid and expands to drive the plugging member 43 to move away from the valve body 42 to open the drain channel 45. Therefore, the coolant can be discharged from the inside of the battery pack 1 to the outside of the battery pack 1 through the drain channel 45. After the drainage is completed, the elastic member 44 drives the plugging member 43 to move towards the valve body 42 to close the drain channel 45.

[0035] Among them, when the cooling module 3 is located above the drain valve 4, since condensate is likely to adhere to the cooling module 3, when the condensate drips onto or near the drain valve 4, the condensate is likely to enter the drain valve 4, causing the expansion member 41 to absorb liquid and expand, thereby resulting in the accidental opening of the drain valve 4. This can further lead to the sealing failure of the battery pack 1, thus posing a safety risk.

[0036] To solve the above problems, according to the first aspect of the present disclosure, with reference to Figures 1 to 5 , the present disclosure provides a battery pack 1, including a housing 2, a plurality of battery cells (not shown in the figure) disposed inside the housing 2, a cooling module 3, a drain valve 4, and a partition structure 5. Among them, the cooling module 3 is used to cool the plurality of battery cells, the drain valve 4 penetrates the housing 2 and is located below the cooling module 3. The drain valve 4 includes an expansion member 41, and the expansion member 41 is used to absorb liquid and expand to open the drain valve 4. The partition structure 5 is at least partially located between the drain valve 4 and the cooling module 3 to stop the condensed liquid from falling from above the drain valve 4 to the area where the drain valve 4 is located, and / or to block the contact between the part of the cooling module 3 located above the drain valve 4 and the gas inside the housing 2 to reduce the generation of condensed liquid.

[0037] Through the above technical solution, the partition structure 5 can stop the condensed liquid from falling from the cooling module 3 to the area where the drain valve 4 is located, so as to reduce the possibility that this part of the condensed liquid is absorbed by the expansion member 41 and the drain valve 4 is accidentally opened. Among them, the area where the drain valve 4 is located can be the area / area occupied by the drain valve 4 in its radial direction, or it can be an area within a preset range larger than the area / area occupied by the drain valve 4 in its radial direction; in addition, the cooling module 3 is used to cool the plurality of battery cells, so when the cooling module 3 contacts the gas inside the housing 2, condensate is likely to be generated due to the large temperature difference. The partition structure 5 can also be used to block the contact between the part of the cooling module 3 located above the drain valve 4 and the gas inside the housing 2 to reduce the generation of condensed liquid, so as to reduce the possibility that this part of the condensed liquid is absorbed by the expansion member 41 and the drain valve 4 is accidentally opened.

[0038] Among them, the present disclosure exemplarily sets the maximum radial dimension of the drain valve 4 to 40 mm to explain the area where the above drain valve 4 is located. At this time, the area where the drain valve 4 is located can be the area / area occupied in the radial direction, that is, at this time, the area where the drain valve 4 is located refers to the projection area radiating 40 mm circumferentially around the center of the drain valve 4, or the area where the drain valve 4 is located can be larger than the area / area occupied by the drain valve 4 in its radial direction. For example, at this time, the area where the drain valve 4 is located refers to the projection area radiating 50 mm circumferentially around the center of the drain valve 4. The present disclosure does not make specific limitations on this.

[0039] It can be understood that in actual application scenarios, the possibility of the drainage valve 4 being accidentally opened can be reduced by selecting any one of the above two implementation methods or using both implementation methods simultaneously.

[0040] In some embodiments, referring to Figure 2 and Figure 3 , the cooling module 3 may include a liquid cooling plate 31 and a liquid cooling pipe 32 connected to the liquid cooling plate 31. The liquid cooling plate 31 and the liquid cooling pipe 32 can be used to control the temperature of multiple battery cells to ensure that the battery cells operate within the optimal temperature range.

[0041] Among them, the liquid cooling plate 31 is usually composed of a metal plate with a flow channel inside for the coolant to flow through. The metal plate is closely attached to the battery cell to ensure good thermal contact. When the battery cell generates heat during operation, the liquid cooling plate 31 absorbs the heat generated by the battery cell through close contact with the battery cell, and the coolant circulates through the flow channel inside the liquid cooling plate 31 to take away the heat. In this way, the liquid cooling plate 31 can effectively maintain the temperature of the battery cell within an appropriate range, improving the working efficiency and service life of the battery pack 1.

[0042] The liquid cooling pipe 32 is used to connect the liquid cooling plate 31 and other cooling components (such as a radiator, a water pump, etc.) to form a complete cooling loop. In this way, the coolant flowing in the liquid cooling pipe 32 absorbs heat from the liquid cooling plate 31 and then flows to the radiator or heat exchanger. In the radiator or heat exchanger, the coolant exchanges heat with the outside air to release heat, so that the temperature of the coolant is reduced. The cooled coolant returns to the liquid cooling plate 31 through the liquid cooling pipe 32 to absorb the heat generated by the battery cell again. Therefore, the liquid cooling pipe 32 and the liquid cooling plate 31 together form a closed-loop system that continuously circulates to maintain the temperature stability of the battery pack 1.

[0043] In addition, the drainage valve 4 is located below the liquid cooling pipe 32, and the partition structure 5 is at least partially located between the drainage valve 4 and the liquid cooling pipe 32 and / or the liquid cooling plate 31. In this way, the partition structure 5 can reduce the possibility of condensate forming on the liquid cooling pipe 32 and the liquid cooling plate 31, or the partition structure 5 can block the condensate formed on the liquid cooling pipe 32 and the liquid cooling plate 31 to reduce the possibility of this part of the condensate falling into the area where the drainage valve 4 is located, thereby reducing the possibility of the drainage valve 4 being accidentally opened.

[0044] It can be understood that the partition structure 5 can be constructed in any suitable manner. In some embodiments, referring to Figure 3The barrier structure 5 may include a coating layer 51, which is attached to the portion of the cooling module 3 located above the drain valve 4 to isolate the portion from contact with the gas in the housing 2. In this way, the generation of condensed liquid can be reduced by the coating layer 51. Exemplarily, the coating layer 51 may include an air barrier layer, so that the air barrier layer is provided around the liquid cooling pipe 32, which can reduce the direct contact between the liquid cooling pipe 32 and the gas in the surrounding environment, thereby reducing the generation of condensed water.

[0045] In addition, the coating layer 51 may include an insulation layer, for example, the insulation layer may be constructed as a flannel tape, which has a certain insulation performance, can reduce the temperature difference between the liquid cooling pipe 32 and the surrounding environment, and reduce the formation of condensed water. Alternatively, the insulation layer may be constructed as insulation cotton, such as glass fiber wool, rock wool, etc., to have good insulation performance, can reduce the temperature difference between the liquid cooling pipe 32 and the surrounding environment, thereby reducing the generation of condensed water.

[0046] Of course, the coating layer 51 may also include a hygroscopic layer, for example, the hygroscopic layer may be constructed of silica gel, which is a material with good hygroscopic properties and can absorb moisture in the air in the housing 2 to reduce the formation of condensed water. Alternatively, the hygroscopic layer may include a molecular sieve, which is a material with high hygroscopic capacity and can effectively absorb moisture in the air to prevent the generation of condensed water.

[0047] Of course, the coating layer 51 may also include a composite layer that combines the above-mentioned functional layers. For example, a heat-insulating layer and a hygroscopic layer may be combined, such as embedding silica particles in foam plastics, which can both keep warm and absorb moisture. Alternatively, a combination of multiple layers of materials with different functions, such as an outer layer of an air barrier and an inner layer of a hygroscopic layer and a heat-insulating layer, can effectively prevent the generation of condensed water. The present disclosure does not specifically limit this.

[0048] In some embodiments, reference Figures 2 to 5 The cooling module 3 may include a liquid cooling plate 31 and a liquid cooling pipe 32 connected to the liquid cooling plate 31. The portion of the cooling module 3 located above the drain valve 4 includes a portion of the liquid cooling pipe 32. The coating layer 51 circumferentially covers the portion of the liquid cooling pipe 32. This is used to reduce the generation of condensed liquid or stop the condensed liquid from falling from the portion of the condensing pipe to the drain valve 4. In this way, the drain valve 4 can be blocked by the coating layer 51 to reduce the possibility of the portion of condensed liquid entering the drain channel 45, so as to reduce the possibility of the expansion member 41 in the drain valve 4 absorbing the portion of condensed liquid and opening by mistake, thereby ensuring the effective sealing of the battery pack 1.

[0049] It can be understood that the cladding layer 51 can be arranged in any suitable manner. Exemplarily, the cladding layer 51 can partially wrap around the circumferential direction of this part of the condensate pipe. At this time, the cladding layer 51 is located between this part of the condensate pipe and the drain valve 4. Alternatively, the cladding layer 51 can entirely wrap around this part of the condensate pipe in the circumferential direction. The present disclosure does not make specific limitations in this regard.

[0050] In addition, the arrangement length of the cladding layer 51 along the extension direction of the liquid cooling pipe 32 can be selected according to the actual usage situation. For example, it can be selected according to the occupied space of the drain valve 4, or the entire liquid cooling pipe 32 can be wrapped with the cladding layer 51.

[0051] In some embodiments, referring to Figure 3 , the partition structure 5 may further include a liquid absorption layer 52 wrapped outside the cladding layer 51, and the liquid absorption layer 52 is used to absorb the condensed liquid. In this way, if the cladding layer 51 is accidentally damaged, for example, when the cladding layer 51 forms a notch and cannot block the contact between the liquid cooling pipe 32 and the gas in the housing 2, and thus condensed liquid is generated, the liquid absorption layer 52 can absorb this part of the condensed liquid to reduce the possibility of this part of the liquid flowing into the drain channel 45 and accidentally opening the drain valve 4.

[0052] It can be understood that the liquid absorption layer 52 can be constructed in any suitable manner. For example, the liquid absorption layer 52 can include a water-absorbing resin, which is a synthetic material that can absorb and retain a large amount of moisture and is suitable for absorbing condensed water. Or, a water-absorbing material made of polyester fiber, such as a water-absorbing cloth or a water-absorbing pad, can effectively absorb and retain moisture and is suitable for absorbing condensed water. The present disclosure is not limited thereto.

[0053] In some embodiments, referring to Figure 3 , the partition structure 5 may include a retaining cover 53, and the retaining cover 53 is located between the drain valve 4 and the cooling module 3 and its projection on the drain valve 4 covers the mounting hole 46. In this way, the retaining cover 53 can block the condensed liquid falling from above the drain valve 4 to the area where the drain valve 4 is located, so as to reduce the possibility of this part of the condensed liquid flowing into the drain channel 45 through the mounting hole 46 and accidentally opening the drain valve 4. When the condensed liquid falls from the cooling module 3 towards the drain valve 4, the retaining cover 53 can block this part of the condensed liquid from entering the mounting hole 46, so as to reduce the possibility of this part of the condensed liquid flowing into the drain channel 45 through the mounting hole 46 and accidentally opening the drain valve 4.

[0054] It can be understood that the retaining cover 53 can be connected to at least one of the valve body 42, the housing 2, and the cooling module 3. In some embodiments, referring to Figure 3, the baffle 53 can be connected to the valve body 42. For example, the baffle 53 can include a connecting portion 531 connected to the valve body 42 and a liquid blocking portion 532 connected to the connecting portion 531. A liquid blocking space is formed among the connecting portion 531, the liquid blocking portion 532, and the valve body 42, and the mounting hole 46 is located within the liquid blocking space. In this way, the baffle 53 can separate the liquid blocking space from the external space within the housing 2, so as to prevent the condensed liquid from entering the liquid blocking space, thereby reducing the possibility that this part of the condensed liquid flows into the drainage channel 45 through the mounting hole 46 and accidentally opens the drainage valve 4.

[0055] In some other possible alternative embodiments not shown in the drawings, the baffle 53 can also be connected to the housing 2. For example, the baffle 53 can include a connecting section connected to the housing 2 and a liquid blocking section connected to the connecting section. At this time, the connecting section and the liquid blocking section enclose a liquid blocking space, and the drainage valve 4 is located within the mounting space. In this way, the baffle 53 can separate the liquid blocking space from the external space within the housing 2, so as to prevent the condensed liquid and reduce the possibility that the condensed liquid flows into the drainage channel 45 through the mounting hole 46 and accidentally opens the drainage valve 4. It should be noted that, at this time, a liquid inlet hole needs to be opened on the connecting section to enable the coolant to pass through after the coolant leaks abnormally to open the drainage valve 4, ensuring the normal drainage function of the drainage valve 4, and further ensuring the use safety of the battery pack 1.

[0056] Of course, the baffle 53 can also be connected to the cooling module 3. For example, the cooling module 3 can include a liquid cooling plate 31 and a liquid cooling tube 32 communicating with the liquid cooling plate 31. The baffle 53 can include a first section connected to the liquid cooling tube 32 and a second section connected to the first section. The first section, the second section, and a partial outer wall surface of the liquid cooling tube 32 enclose a storage space. At this time, the storage space is separated from the external space within the housing 2 by the baffle 53. In this way, the condensed liquid generated on the outer wall of the liquid cooling tube 32 can fall to the first section and / or the second section and finally flow to the second section for storage in the storage space. In this way, the possibility that the condensed liquid flows into the drainage channel 45 through the mounting hole 46 and accidentally opens the drainage valve 4 can be reduced.

[0057] According to a second aspect of the present disclosure, a vehicle is provided, including the battery pack 1 as described above. This vehicle has all the beneficial effects of the above-mentioned battery pack 1. Among them, the vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. The embodiments of the present application do not make special restrictions on the above-mentioned vehicles.

[0058] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0059] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, without conflict, they can be combined in any suitable manner. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0060] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A battery pack, characterized in that: include: case; A plurality of battery cells are arranged inside the housing; A cooling module, disposed inside the housing, for cooling the plurality of battery cells; A drain valve is provided through the housing and is located below the cooling module, wherein the drain valve comprises an expansion member, and the expansion member is used to expand by absorbing liquid to open the drain valve; as well as The barrier structure is at least partially located between the drain valve and the cooling module to prevent condensed liquid from falling from above the drain valve to the area where the drain valve is located, and / or to isolate the part of the cooling module located above the drain valve from contact with the gas in the shell to reduce the generation of condensed liquid.

2. The battery pack according to claim 1, characterized in that: The cooling module includes a liquid cooling plate and a liquid cooling pipe connected to the liquid cooling plate, the drain valve is located below the liquid cooling pipe, and the baffle structure is at least partially located between the drain valve and the liquid cooling pipe and / or the liquid cooling plate.

3. The battery pack according to claim 1, characterized in that: The barrier structure comprises a coating layer, and the coating layer is attached to a portion of the cooling module located above the drain valve, so as to isolate the portion from contact with the gas in the shell.

4. The battery pack according to claim 3, characterized in that: The cooling module includes a liquid cooling plate and a liquid cooling pipe connected to the liquid cooling plate. The portion of the cooling module located above the drain valve includes a portion of the liquid cooling pipe, and the coating layer circumferentially coats the portion of the liquid cooling pipe.

5. The battery pack according to claim 4, characterized in that: The covering layer includes at least one of an air barrier layer, a heat-insulating layer and a moisture-absorbing layer.

6. The battery pack according to claim 3, characterized in that: The barrier structure further comprises a liquid absorbing layer coated on the outer side of the coating layer, and the liquid absorbing layer is used for absorbing the condensed liquid.

7. The battery pack according to claim 1, characterized in that: The drain valve includes a valve body, a sealing member and an elastic member, the valve body having a drain channel, the drain channel being used for liquid to flow through so as to discharge the liquid from the interior of the shell, the expansion member being located in the drain channel so as to drive the sealing member to move relative to the valve body by expanding by absorbing liquid so as to open the drain channel, the elastic member being located in the drain channel and connected to the valve body and the sealing member so as to provide elastic force for the sealing member to close the drain channel, a mounting hole for connecting the elastic member is provided at the top end of the valve body, the barrier structure including a blocking cover, the blocking cover being located between the drain valve and the cooling module and having its projection on the drain valve covering the mounting hole.

8. The battery pack according to claim 7, characterized in that: The blocking cover is connected to at least one of the valve body, the shell and the cooling module.

9. The battery pack according to claim 7, characterized in that: The blocking cover includes a connecting portion connected to the valve body and a liquid blocking portion connected to the connecting portion, a liquid blocking space is formed between the connecting portion, the liquid blocking portion and the valve body, and the mounting hole is located in the liquid blocking space.

10. A vehicle, characterized in that: A battery pack comprising any one of claims 1 to 9.

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