Liquid cooling plate, battery pack and electric device

Abstract

The utility model provides a liquid cooling plate, a battery pack and a power utilization device, and relates to the technical field of batteries, the liquid cooling plate comprises a liquid cooling plate main body, the liquid cooling plate main body is provided with a liquid inlet and a liquid outlet, the liquid cooling plate main body is divided into a first cooling area and a second cooling area along a first direction, and the liquid inlet and the liquid outlet are arranged in the first cooling area; wherein the liquid cooling plate main body is located in the first cooling area and is located between the liquid inlet and the liquid outlet to form a first groove structure, and a first liquid discharge hole penetrating through the liquid cooling plate main body is formed in the first groove structure. Furthermore, when the liquid cooling plate main body leaks at the liquid inlet or the liquid outlet or the joint position, the first groove structure is favorable for collecting the cooling liquid, and the cooling liquid is timely drained to the lower part of the liquid cooling plate main body through the first liquid drainage hole in the first groove structure; therefore, the leaked cooling liquid is prevented from influencing the electrical parts in the first cooling area and the second cooling area, and the problems of function failure and short circuit of the electrical parts are avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a liquid cooling plate, a battery pack, and an electrical device. Background Technology

[0002] As a core component of new energy vehicles, the internal temperature of the battery pack directly affects its safety. Therefore, improving battery pack safety requires controlling the internal temperature and enhancing the overall heat dissipation performance. This can be achieved by installing a liquid cooling plate inside the battery pack and injecting liquid into it. The circulating coolant carries away heat, thus cooling the individual battery cells.

[0003] In the prior art, the liquid cooling pipes of the liquid cooling plate are usually arranged in the electrical cavity of the battery pack housing, which is close to the electrical components inside the electrical cavity. Once the liquid cooling pipes leak, it can easily cause short circuits in the electrical components, resulting in the failure of the entire system. Utility Model Content

[0004] The purpose of this application is to provide a liquid cooling plate, a battery pack, and an electrical device to solve the technical problem that liquid cooling plates in the prior art are prone to short circuits in electrical components when leakage occurs.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, this application provides a liquid cooling plate, comprising: a liquid cooling plate body, the liquid cooling plate body having an inlet and an outlet, the liquid cooling plate body being divided into a first cooling zone and a second cooling zone along a first direction, the inlet and the outlet being disposed in the first cooling zone; wherein, the liquid cooling plate body has a first groove structure formed in the first cooling zone and between the inlet and the outlet, and a first drain hole penetrating the liquid cooling plate body is provided in the first groove structure.

[0007] In one or more embodiments of this application, the liquid cooling plate body includes an upper liquid cooling plate and a lower liquid cooling plate, and the first groove structure is formed by the upper liquid cooling plate and the lower liquid cooling plate being recessed downwards simultaneously.

[0008] In one or more embodiments of this application, the first groove structure includes a first groove edge disposed opposite to each other, the first groove edge being disposed close to the liquid inlet and the liquid outlet respectively, and the first groove edge having an arc-shaped structure protruding towards the first drain hole.

[0009] In one or more embodiments of this application, the first groove structure further includes a second groove edge connected to and disposed opposite to the first groove edge, the second groove edge having an arc-shaped structure protruding toward the first drain hole.

[0010] In one or more embodiments of this application, a second groove structure is further provided in the first cooling zone, one side of the second groove structure is disposed close to the second cooling zone, and the first groove structure is located inside the second groove structure, and the groove depth of the first groove structure is greater than that of the second groove structure.

[0011] In one or more embodiments of this application, the second groove structure is formed by the upper liquid cooling plate and the lower liquid cooling plate being recessed downwards simultaneously. A second drain hole is provided in the second groove structure and near the second cooling zone. The second drain hole passes through the main body of the liquid cooling plate.

[0012] Secondly, this application also provides a battery pack, including: a battery pack housing, a liquid cooling plate as described in any one of the first aspects, and a battery module. The battery pack housing includes a bottom protective plate and is divided into an electrical cavity and a battery module cavity along a first direction. The liquid cooling plate is disposed above the bottom protective plate of the battery pack housing, and a first cooling zone is disposed corresponding to the electrical cavity, and a second cooling zone is disposed corresponding to the battery module cavity. The battery module is disposed above the second cooling zone.

[0013] In one or more embodiments of this application, a crossbeam is provided inside the battery pack housing to separate the electrical cavity and the battery module cavity, and sealant is provided between the crossbeam and the upper liquid cooling plate.

[0014] In one or more embodiments of this application, a water-absorbing element is provided between the lower liquid cooling plate and the bottom protective plate of the battery pack housing.

[0015] Thirdly, this application provides an electrical device including the battery pack described in any of the second aspects.

[0016] Based on the above technical solutions, the liquid cooling plate, battery pack, and electrical device of this application have at least the following beneficial technical effects:

[0017] The liquid cooling plate provided in this embodiment has its inlet and outlet located in the first cooling zone. A first groove structure is provided between the inlet and outlet in the first cooling zone, and a first drain hole is provided within the first groove structure to allow liquid to drain out. Therefore, when the liquid cooling plate body leaks at the inlet, outlet, or joint, the first groove structure facilitates the collection of coolant, and the coolant is promptly guided to the area below the liquid cooling plate body through the first drain hole within the first groove structure. This prevents the leaked coolant from affecting the electrical components in the first and second cooling zones, avoiding malfunctions and short circuits in the electrical components.

[0018] In this embodiment, a sealant is provided between the crossbeam and the upper liquid cooling plate. The sealant has good fluidity, and its good fluidity and filling properties ensure a complete seal between the crossbeam and the upper liquid cooling plate, maintaining good sealing performance and preventing leakage into the battery module cavity.

[0019] In this embodiment of the application, a water-absorbing component is provided between the lower liquid cooling plate and the bottom protective plate of the battery pack housing. When coolant flows between the lower liquid cooling plate and the bottom protective plate, the water-absorbing component utilizes its excellent water absorption performance to absorb the leaked coolant. During maintenance of the battery pack, only the water-absorbing component needs to be replaced, effectively reducing after-sales costs caused by coolant leakage.

[0020] On the other hand, in the battery pack provided in this application embodiment, when the liquid cooling plate leaks at the inlet, outlet, or connector, the first groove structure of the liquid cooling plate is conducive to collecting the coolant, and the coolant is promptly guided to the space between the liquid cooling plate and the bottom protective plate through the first drain hole in the first groove structure. This effectively prevents the coolant from flowing into the battery module cavity and also prevents the coolant from affecting the electrical components in the electrical cavity, thus avoiding the problems of short circuits and functional failures in the battery pack. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the liquid cooling plate provided in this application.

[0023] Figure 2 yes Figure 1 Enlarged view of point A in the image.

[0024] Figure 3 This is a top view of the liquid cooling plate provided in this application.

[0025] Figure 4 This is an exploded structural diagram of the liquid cooling plate provided in this application.

[0026] Figure 5 This is a partial exploded structural diagram of the liquid cooling plate provided in this application.

[0027] Figure 6 This is a schematic diagram of the battery pack provided in this application.

[0028] Figure 7 This is a top view of the battery pack provided in this application.

[0029] Figure 8 This is a schematic diagram of the liquid cooling plate in the battery pack provided in this application.

[0030] Figure 9This is an exploded structural diagram of the liquid cooling plate and bottom protective plate in the battery pack provided in this application.

[0031] In the diagram: 1-Liquid cooling plate body; 2-Battery pack housing; 3-Battery module; 10-Upper liquid cooling plate; 11-Lower liquid cooling plate; 12-First cooling zone; 13-Second cooling zone; 14-First flow channel; 15-Second flow channel; 21-Crossbeam; 22-Sealant; 23-Bottom protective plate; 24-Water absorption component; 25-Electrical cavity; 26-Battery module cavity; 101-Liquid inlet; 102-Liquid outlet; 103-First groove structure; 104-First drain hole; 105-Second groove structure; 106-Second drain hole; 1031-First groove edge; 1032-Second groove edge. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In related technologies, liquid cooling lines used in battery packs are usually located in the electrical cavity, which is close to electrical components such as BDU, BMS, and busbars. When the liquid cooling lines or connecting water nozzles leak, the coolant can easily flow into the battery module cavity, soaking the battery cells and causing short circuits or thermal runaway. On the other hand, if the coolant in the electrical cavity is not drained in time and overflows the busbars in the electrical cavity, it will also cause a short circuit, leading to battery pack failure.

[0037] Based on the above considerations, in order to solve the technical problem that leakage in existing liquid cooling plates can easily lead to short circuits in electrical components, this application provides a liquid cooling plate, including a liquid cooling plate body. The liquid cooling plate body has a liquid inlet and a liquid outlet, and the liquid cooling plate body is divided into a first cooling zone and a second cooling zone along a first direction. The liquid inlet and the liquid outlet are disposed in the first cooling zone. A first groove structure is formed in the liquid cooling plate body within the first cooling zone and between the liquid inlet and the liquid outlet. A first drain hole penetrating the liquid cooling plate body is provided within the first groove structure.

[0038] In the technical solution of this application, when the liquid cooling plate body leaks at the inlet, outlet or joint, the first groove structure is conducive to collecting the coolant and timely guiding the coolant to the bottom of the liquid cooling plate body through the first drain hole in the first groove structure, thereby avoiding the leakage of coolant from affecting the electrical components in the first and second cooling zones, and avoiding the problems of electrical component failure and short circuit.

[0039] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0040] Please refer to Figure 1 , Figure 2 and Figure 3 This application provides a liquid cooling plate, including a liquid cooling plate body 1. The liquid cooling plate body 1 is provided with an inlet 101 and an outlet 102. The liquid cooling plate body 1 is divided into a first cooling zone 12 and a second cooling zone 13 along a first direction X. The inlet 101 and the outlet 102 are disposed in the first cooling zone 12. The liquid cooling plate body 1 is provided with a first groove structure 103 in the first cooling zone 12 and between the inlet 101 and the outlet 102. A first drain hole 104 is provided in the first groove structure 103, which penetrates the liquid cooling plate body 1.

[0041] The inlet 101 can be an inlet for introducing coolant into the liquid cooling plate body 1. The inlet 101 can be connected to an inlet pipe. The outlet 102 can be an outlet for allowing coolant to flow out of the liquid cooling plate body 1. The outlet 102 can be connected to an outlet pipe. The first direction X can be the length direction of the liquid cooling plate body 1. In some embodiments, the first cooling zone 12 and the second cooling zone 13 are used to cool different electrical components, for example: the first cooling zone 12 is used to cool electrical components in the battery pack, and the second cooling zone 13 is used to cool battery modules in the battery pack. The first groove structure 103 is formed in the region between the inlet 101 and the outlet 102 in the first cooling zone 12. The first drain hole 104 is a through hole structure penetrating the liquid cooling plate body 1.

[0042] In the technical solution of this application embodiment, when the liquid cooling plate body 1 leaks at the inlet 101, outlet 102, or connector, the first groove structure 103 facilitates the collection of coolant and timely guides the coolant to the bottom of the liquid cooling plate body 1 through the first drain hole 104 in the first groove structure 103, thereby avoiding the leakage of coolant from affecting the electrical components in the first cooling zone 12 and the second cooling zone 13, and avoiding the problems of electrical component failure and short circuit.

[0043] Please refer to Figure 2 , Figure 4 and Figure 5 In some embodiments, the liquid cooling plate body 1 includes an upper liquid cooling plate 10 and a lower liquid cooling plate 11, and the first groove structure 103 is formed by the upper liquid cooling plate 10 and the lower liquid cooling plate 11 being recessed downwards simultaneously.

[0044] The lower liquid cooling plate 11 has a first flow channel 14 corresponding to the second cooling zone 13, allowing coolant to flow. A second flow channel 15 is provided in the area of ​​the first cooling zone 12 on the lower liquid cooling plate 11. The second flow channel 15 is connected to the first flow channel 14 and is also connected to the inlet 101 and the outlet 102. The first groove structure 103 is spaced apart from the second flow channel 15. After the upper liquid cooling plate 10 and the lower liquid cooling plate 11 are installed, the second flow channel 15 and the first groove structure 103 are isolated to prevent coolant from entering the first groove structure 103 during normal cooling. In some embodiments, the upper liquid cooling plate 10 and the lower liquid cooling plate 11 are welded together.

[0045] In the technical solution of this application embodiment, the first groove structure 103 is formed by the above-mentioned arrangement, so that the upper liquid cooling plate 10 and the lower liquid cooling plate 11 are simultaneously recessed downwards, and the upper liquid cooling plate 10 and the lower liquid cooling plate 11 can be pressed downwards to form the first groove structure 103, so as to facilitate processing.

[0046] Please refer to Figure 3In some embodiments, the first groove structure 103 includes a first groove edge 1031 disposed opposite to each other. The first groove edge 1031 is disposed close to the liquid inlet 101 and the liquid outlet 102 respectively. The first groove edge 1031 has an arc-shaped structure that protrudes in the direction of the first drain hole 104.

[0047] In this process, while ensuring the welding area of ​​the upper liquid cooling plate 10 and the lower liquid cooling plate 11, the first groove edge 1031 of the first groove structure 103 is set as close as possible to the liquid inlet 101 and the liquid outlet 102, so that when the coolant leaks, it is collected first through the first groove structure 103 and flows into the lower part of the liquid cooling plate body 1 through the first drain hole 104.

[0048] In the technical solution of this application embodiment, by setting the first groove edge 1031 as an arc-shaped structure protruding towards the first drain hole 104, the welding area between the upper liquid cooling plate 10 and the lower liquid cooling plate 11 at the liquid inlet 101 and the liquid outlet 102 is ensured, thereby isolating the liquid inlet 101 and the liquid outlet 102 from the first groove structure 103. This also facilitates the collection of leaked liquid.

[0049] Please refer to Figure 3 The first groove structure 103 also includes a second groove edge 1032 connected to and opposite to the first groove edge 1031, the second groove edge 1032 having an arc-shaped structure protruding towards the first drain hole 104.

[0050] In the technical solution of this application embodiment, by setting the first groove edge 1031 and the second groove edge 1032 of the first groove structure 103 as an arc-shaped structure protruding towards the first drain hole 104, the first groove structure 103 can easily collect the leaked coolant, which is beneficial for collecting the leaked liquid.

[0051] Please refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, a second groove structure 105 is also provided in the first cooling zone 12. One side of the groove of the second groove structure 105 is located close to the second cooling zone 13, and the first groove structure 103 is located in the second groove structure 105. The groove depth of the first groove structure 103 is greater than that of the second groove structure 105.

[0052] It can be understood that the area of ​​the second groove structure 105 is larger than the area of ​​the first groove structure 103.

[0053] In the technical solution of this application embodiment, by setting a second groove structure 105 with a larger area than the first groove structure 103 in the first cooling zone 12, and setting one side of the second groove structure 105 close to the second cooling zone 13, when coolant leaks from other locations, it will preferentially fill the second groove structure 105 and flow into the first groove structure 103 and be discharged through the first drain hole 104, thereby preventing the coolant leaking from the first cooling zone 12 from entering the second cooling zone 13, so as to protect the electrical components in the second cooling zone 13.

[0054] In some embodiments, the bottom of the second groove structure 105 of the upper liquid cooling plate 10 is 2-3.5 mm lower than the liquid cooling plate of the second cooling zone 12. This prevents leaked coolant from entering the second cooling zone 13.

[0055] In some embodiments, the second groove structure 105 is formed by the upper liquid cooling plate 10 and the lower liquid cooling plate 11 being simultaneously recessed downwards. A second drain hole 106 is provided within the second groove structure 105 and near the second cooling zone 13, and the second drain hole 106 penetrates the liquid cooling plate body 1. Figure 3 The second drain hole 106 can be provided in multiple locations on the groove edge of the second groove structure 105 near the second cooling zone 13, so that the leakage collected in the second groove structure 105 can be discharged in a timely manner through the second drain hole 106.

[0056] The second groove structure 105 located on the lower liquid cooling plate 11 is isolated from the second flow channel 15, and also isolated from the liquid inlet 101 and the liquid outlet 102. The upper liquid cooling plate 10 and the lower liquid cooling plate 11 can be pressed downward to form the second groove structure 105.

[0057] In the technical solution of this application embodiment, through the above-mentioned arrangement, when coolant leaks in other locations, it preferentially fills the second groove structure 105 and can be discharged to the bottom of the liquid cooling plate body 1 through the second drain hole 106, so as to discharge the leaked liquid in time and avoid short circuit to electrical components.

[0058] On the other hand, please refer to Figure 6 , Figure 7 This application also provides a battery pack, including: a battery pack housing 2, the aforementioned liquid cooling plate and battery module 3, the battery pack housing 2 including a bottom protective plate 23, the battery pack housing 2 being divided into an electrical cavity 25 and a battery module cavity 26 along a first direction X; the liquid cooling plate is disposed above the bottom protective plate 23 of the battery pack housing 2, and a first cooling zone 12 is disposed corresponding to the electrical cavity 25, and a second cooling zone 13 is disposed corresponding to the battery module cavity 26; the battery module 3 is disposed above the second cooling zone 13.

[0059] The battery pack in this application refers to a physical module that includes one or more battery modules to provide higher voltage and capacity. The battery pack can be used in various battery-powered devices.

[0060] In the technical solution of this application embodiment, when leakage occurs at the inlet 101 or outlet 102 or connector of the battery pack, the first groove structure 103 of the liquid cooling plate is conducive to collecting the coolant, and the coolant is promptly guided to the space between the bottom of the liquid cooling plate and the bottom protective plate 23 through the first drain hole 104 in the first groove structure 103, effectively preventing the coolant from flowing into the battery module cavity 26, and also preventing the coolant from affecting the electrical components in the electrical cavity 25, thus avoiding the problem of short circuit and functional failure of the battery pack.

[0061] Please refer to Figure 7 and Figure 8 In some embodiments, the battery pack housing 2 is provided with a crossbeam 21 for separating the electrical cavity 25 and the battery module cavity 26, and a sealant 22 is provided between the crossbeam 21 and the upper liquid cooling plate 10.

[0062] The crossbeam 21 is a plate used to isolate the electrical cavity 25 and the battery module cavity 26 within the battery pack housing 2. The crossbeam 21 is connected to the upper liquid cooling plate 10 using bolts or FDS self-tapping screws. However, neither of these connection methods can completely seal the connection surfaces of the crossbeam 21 and the upper liquid cooling plate 10, resulting in a gap between them. This application provides a sealant 22 between the crossbeam 21 and the upper liquid cooling plate 10. The sealant 22 has good fluidity, and its excellent fluidity and filling properties ensure a complete seal between the crossbeam 21 and the upper liquid cooling plate 10, maintaining good sealing performance and preventing leakage into the battery module cavity 26.

[0063] Please refer to Figure 9 In some embodiments, a water-absorbing component 24 is provided between the lower liquid cooling plate 11 and the bottom protective plate 23 of the battery pack housing 2. Multiple water-absorbing components 24 can be provided. For example, they can be provided between the first cooling zone 12 of the lower liquid cooling plate 11 and the bottom protective plate 23, or between the second cooling zone 13 of the lower liquid cooling plate 11 and the bottom protective plate 23, or both zones can be provided.

[0064] The absorbent component 24 can be a foam with strong water absorption properties, so that when coolant flows between the lower liquid cooling plate 11 and the bottom protective plate 23, the foam can absorb a portion of the coolant using its excellent water absorption properties. During maintenance of the battery pack of this application, only the absorbent foam needs to be replaced, which can effectively reduce after-sales costs caused by coolant leakage.

[0065] On the other hand, this application also provides an electrical device, including the aforementioned battery pack. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid-cooled plate, characterized in that, include: The liquid cooling plate body (1) is provided with a liquid inlet (101) and a liquid outlet (102). The liquid cooling plate body (1) is divided into a first cooling zone (12) and a second cooling zone (13) along a first direction (X). The liquid inlet (101) and the liquid outlet (102) are located in the first cooling zone (12). The liquid cooling plate body (1) has a first groove structure (103) formed in the first cooling zone (12) and between the liquid inlet (101) and the liquid outlet (102), and a first drain hole (104) is provided in the first groove structure (103) that penetrates the liquid cooling plate body (1).

2. The liquid cooling plate according to claim 1, characterized in that, The liquid cooling plate body (1) includes an upper liquid cooling plate (10) and a lower liquid cooling plate (11), and the first groove structure (103) is formed by the upper liquid cooling plate (10) and the lower liquid cooling plate (11) being recessed downwards simultaneously.

3. The liquid cooling plate according to claim 2, characterized in that, The first groove structure (103) includes a first groove edge (1031) arranged opposite to each other. The first groove edge (1031) is arranged close to the liquid inlet (101) and the liquid outlet (102) respectively. The first groove edge (1031) has an arc-shaped structure that protrudes towards the first drain hole (104).

4. The liquid cooling plate according to claim 3, characterized in that, The first groove structure (103) also includes a second groove edge (1032) connected to and opposite to the first groove edge (1031), the second groove edge (1032) having an arc-shaped structure protruding towards the first drain hole (104).

5. The liquid-cooled plate according to any one of claims 2 to 4, characterized in that, A second groove structure (105) is also provided in the first cooling zone (12). One side of the groove of the second groove structure (105) is located close to the second cooling zone (13), and the first groove structure (103) is located in the second groove structure (105). The groove depth of the first groove structure (103) is greater than that of the second groove structure (105).

6. The liquid cooling plate according to claim 5, characterized in that, The second groove structure (105) is formed by the upper liquid cooling plate (10) and the lower liquid cooling plate (11) being recessed downwards simultaneously. A second drain hole (106) is provided in the second groove structure (105) and near the second cooling zone (13). The second drain hole (106) is provided through the main body of the liquid cooling plate (1).

7. A battery pack, characterized in that, include: The battery pack housing (2) includes a bottom protective plate (23), and the battery pack housing (2) is divided into an electrical cavity (25) and a battery module cavity (26) along the first direction (X); The liquid cooling plate according to any one of claims 1 to 6 is disposed above the bottom protective plate (23) of the battery pack housing (2), and the first cooling zone (12) is disposed corresponding to the electrical cavity (25), and the second cooling zone (13) is disposed corresponding to the battery module cavity (26); and The battery module (3) is disposed above the second cooling zone (13).

8. The battery pack according to claim 7, characterized in that, The battery pack housing (2) is provided with a crossbeam (21) for separating the electrical cavity (25) and the battery module cavity (26), and a sealant (22) is provided between the crossbeam (21) and the upper liquid cooling plate (10).

9. The battery pack according to claim 7, characterized in that, A water-absorbing element (24) is provided between the lower liquid cooling plate (11) and the bottom protective plate (23) of the battery pack housing (2).

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 7 to 9.

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