Battery pack and electric device

Abstract

Embodiments of the present application provide a battery pack and an electric device. The battery pack comprises: a box body provided with a through slot extending along a first direction and having a first opening, and further provided with a first through hole in communication with the through slot; a liquid cooling plate connected to one side of the box body along the first direction and covering the first opening, so that at least part of the through slot forms an accommodation cavity; a water nozzle arranged in the accommodation cavity and connected to the liquid cooling plate, the water nozzle being at least partially provided in the first through hole and extending out of the box body, and the water nozzle and a hole wall of the first through hole having a gap therebetween; and a sealing member connected to the box body and the water nozzle respectively to cover the gap. In the embodiments of the present application, the sealing member is arranged, so that the production efficiency and the sealing effect of the box body can be improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] Battery packs, as a crucial power source for electrical equipment, are widely used in new energy vehicles, aerospace, and other technological fields. During operation, battery packs generate heat, which significantly impacts their performance and lifespan. Therefore, liquid cooling systems are typically required to cool the battery packs.

[0003] In related technologies, liquid cooling systems typically include a liquid cooling plate and water nozzles, with the water nozzles welded to the battery pack casing. However, welding the water nozzles directly to the casing requires precise positioning of the nozzles, involves significant machining of the casing, and reduces production efficiency and the casing's sealing performance. Utility Model Content

[0004] This application aims to provide a battery pack and power supply device to solve the problems of existing water taps being directly welded to the housing, which have high requirements for the position accuracy of the water taps, require a large amount of machining of the housing, reduce production efficiency, and affect the sealing effect of the housing.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, this application discloses a battery pack having a first orientation, the battery pack comprising: The box body is provided with a through groove extending along the first direction and having a first opening, and the box body is also provided with a first through hole, the first through hole communicating with the through groove; A liquid cooling plate is connected to one side of the housing along the first direction and covers the first opening so that at least a portion of the through groove forms a receiving cavity; A water nozzle is disposed within the receiving cavity and connected to the liquid cooling plate. The water nozzle passes through the first through hole and extends to the outside of the housing. There is a gap between the water nozzle and the wall of the first through hole. And a sealing element, which is connected to the housing and the water tap respectively to seal the gap.

[0006] Optionally, the sealing element is at least partially embedded within the gap.

[0007] Optionally, the sealing member includes a connecting portion and an embedding portion that are interconnected; wherein, The embedded part is fitted into the gap; The connecting parts are fixedly connected to the housing and the water tap, respectively.

[0008] Optionally, the connecting parts are welded and fixed to the housing and the water tap respectively, forming two spaced weld marks.

[0009] Optionally, the insert is disposed around the water nozzle, and the outer diameter of the insert is smaller than the inner diameter of the first through hole; The housing includes an outer side surface, which is away from the through groove, and the first through hole penetrates the outer side surface. The connecting part is welded to the outer side.

[0010] Optionally, the connecting part and the embedding part are integrally formed.

[0011] Optionally, the sealing member has a second through hole that penetrates the sealing member, and the water nozzle is inserted into the second through hole, wherein the inner diameter of the second through hole is larger than the outer diameter of the water nozzle.

[0012] Optionally, the box body includes multiple side beams, which enclose the through groove. The first through hole is provided in the side beam.

[0013] Optionally, the battery pack further includes a sealing plate; The side beam has a cavity, and the cavity has a second opening, which communicates with the first through hole; The sealing piece is disposed at the second opening and connected to the side beam to cover the second opening.

[0014] Secondly, this application also discloses an electrical device, which includes the battery pack described in any of the above claims.

[0015] In this embodiment, by setting a sealing component, which is connected to the housing and the water nozzle respectively, the sealing component can seal the gap between the water nozzle and the wall of the first through hole, and realize the connection between the water nozzle and the housing. This can reduce the positional requirements of the water nozzle, reduce the amount of machining required for the housing, and thus improve production efficiency and the sealing effect of the housing.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application; Figure 2This is an exploded view of a battery pack provided in an embodiment of this application; Figure 3 This is a partial cross-sectional view of a battery pack provided in an embodiment of this application; Figure 4 This is another partial cross-sectional view of a battery pack provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a sealing component for a battery pack provided in an embodiment of this application; Figure 6 This is a side view of a battery pack provided in an embodiment of this application; Figure 7 yes Figure 6 A magnified structural diagram of point B is shown below; Figure 8 This is a schematic diagram of the structure of a battery pack housing provided in an embodiment of this application.

[0018] Figure 9 yes Figure 8 A magnified structural diagram of point A is shown below; Figure 10 This is a partially enlarged schematic diagram of a battery pack provided in an embodiment of this application.

[0019] Figure label: 1. Housing; 10. Outer side; 11. Through groove; 12. First opening; 13. First through hole; 14. Side beam; 141. Cavity; 142. Second opening; 2. Liquid cooling plate; 3. Receiving cavity; 4. Water nozzle; 5. Gap; 6. Sealing component; 61. Connecting part; 62. Embedded part; 63. Second through hole; 7. Sealing piece; 8. Weld mark; Z, First direction. Detailed Implementation

[0020] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] This application provides a battery pack, which will be described in detail below with reference to the accompanying drawings.

[0025] Reference Figures 1-10 This application discloses a battery pack, which has a first direction Z and includes: a housing 1, the housing 1 having a through groove 11 extending along the first direction Z and having a first opening 12, and the housing 1 also having a first through hole 13 communicating with the through groove 11; a liquid cooling plate 2, the liquid cooling plate 2 being connected to one side of the housing 1 along the first direction Z and covering the first opening 12 so that at least part of the through groove 11 forms a receiving cavity 3; a water nozzle 4, the water nozzle 4 being partially disposed in the receiving cavity 3 and connected to the liquid cooling plate 2, the water nozzle 4 being partially inserted through the first through hole 13 and extending to the outside of the housing 1, and a gap 5 between the water nozzle 4 and the hole wall of the first through hole 13; and a sealing member 6, the sealing member 6 being connected to the housing 1 and the water nozzle 4 respectively to cover the gap 5.

[0026] Specifically, the first direction Z is as follows Figure 1 The Z-axis direction shown is the first direction Z, which is the height direction of the battery pack.

[0027] The material of enclosure 1 can include, but is not limited to, aluminum alloy, stainless steel, etc., giving enclosure 1 high structural strength and providing a stable mounting foundation for the components inside enclosure 1. For example... Figure 2 As shown, the housing 1 has a through groove 11, and the bottom end of the through groove 11 along the first direction Z has a first opening 12. Figure 1As shown, the liquid cooling plate 2 is fixedly connected to the bottom end of the housing 1 along the first direction Z to cover the first opening 12. The connection methods between the liquid cooling plate 2 and the housing 1 include, but are not limited to, friction stir welding, flow drill screwing (FDS), screwing, and adhesive bonding. In this way, the liquid cooling plate 2 and the housing 1 can enclose and form a receiving cavity 3. Furthermore, the battery pack also includes a battery module, which is disposed inside the receiving cavity 3, and the bottom end of the battery module along the first direction Z is connected to the liquid cooling plate 2.

[0028] The liquid cooling plate 2 can take the form of, but is not limited to, a brazed cold plate or a profile cold plate. The liquid cooling plate 2 has multiple flow channels through which coolant flows. The circulation of the coolant within these channels carries away the heat generated during the operation of the battery module, effectively cooling the battery module. The coolant can be water, ethylene glycol, etc.

[0029] In some embodiments, the water tap 4 can be made of aluminum alloy, manufactured through machining, casting, or other methods, such as... Figure 3 As shown, the water nozzle 4 has a channel inside, which is connected to the flow channel inside the liquid cooling plate 2. Coolant can enter and exit the flow channel inside the liquid cooling plate 2 through the channel of the water nozzle 4. Compared with the prior art that connects the water nozzle 4, the liquid cooling plate 2 and the water nozzle connector through the liquid cooling pipe, the water nozzle 4 integrates the water nozzle connector and the channel connecting the water nozzle 4 to the liquid cooling plate 2, eliminating the liquid cooling pipe connection and reducing the risk of seal failure.

[0030] The water nozzle 4 can be fixedly connected to the liquid cooling plate 2 by brazing, gas shielded welding, or other methods to prevent coolant leakage at the connection between the water nozzle 4 and the liquid cooling plate 2, thereby improving the sealing effect. Furthermore, there can be at least two water nozzles 4, and correspondingly at least two sealing parts 6 and first through holes 13, one for water inlet and the other for water outlet.

[0031] The housing 1 is provided with a first through hole 13, which communicates with the through groove 11. During installation, the water nozzle 4 can be fixed to the liquid cooling plate 2 first, and then the water nozzle 4 can be inserted into the first through hole 13 from one side of the receiving cavity 3, so that the water nozzle 4 at least partially passes through the first through hole 13 and extends to the outside of the housing 1, facilitating the connection between the external liquid cooling plate 2 and the housing 1. At this time, if Figure 3 and Figure 4 As shown, there is an annular gap 5 between the outer periphery of the water nozzle 4 and the wall of the first through hole 13.

[0032] The sealing component 6 can be connected to the housing 1 and the water nozzle 4 by welding, bonding or other means, so that the sealing component 6 can cover the annular gap 5 and realize the connection between the water nozzle 4 and the housing 1.

[0033] In this embodiment, by setting a sealing component 6, which is connected to the housing 1 and the water nozzle 4 respectively, the sealing component 6 can seal the gap 5 between the water nozzle 4 and the wall of the first through hole 13, and realize the connection between the water nozzle 4 and the housing 1. This can reduce the positional requirements of the water nozzle 4, reduce the amount of machining required for the housing 1, and thus improve production efficiency and the sealing effect of the housing 1.

[0034] Optionally, the sealing element 6 is at least partially embedded within the gap 5.

[0035] Specifically, such as Figure 4 and Figure 5 As shown, at least a portion of the sealing element 6 can be embedded inside the gap 5, and then connected to the housing 1 and the water nozzle 4 respectively. In practical applications, by embedding at least a portion of the sealing element 6 within the gap 5 between the wall of the first through hole 13 and the water nozzle 4, a better sealing effect can be achieved, thereby further improving the sealing effect of the sealing element 6 on the housing 1.

[0036] Optionally, the sealing component 6 includes a connecting part 61 and an embedded part 62 that are connected to each other; wherein, the embedded part 62 is embedded in the gap 5; and the connecting part 61 is fixedly connected to the housing 1 and the water nozzle 4 respectively.

[0037] Specifically, such as Figure 5 As shown, the connecting part 61 and the insert part 62 can be connected to each other by welding, bonding, or other methods. Figure 3 and Figure 4 As shown, the embedding part 62 of the sealing member 6 can be embedded in the gap 5 between the water nozzle 4 and the wall of the first through hole 13 to better achieve the sealing effect and further improve the sealing effect of the sealing member 6 on the housing 1. The connecting part 61 can be fixedly connected to the housing 1 and the water nozzle 4 by welding, bonding or other means to ensure a stable connection between the sealing member 6 and the housing 1 and the water nozzle 4.

[0038] In this embodiment, by making the sealing member 6 include a connecting part 61 and an embedding part 62, during the installation process, the embedding part 62 can be first embedded into the gap 5 between the water nozzle 4 and the wall of the first through hole 13, and then the connecting part 61 can be connected to the housing 1 and the water nozzle 4 respectively. This can effectively seal the gap 5, improve the connection strength between the water nozzle 4 and the housing 1, improve the stability and reliability of the overall structure, and also improve production efficiency.

[0039] Optionally, the connecting part 61 is welded and fixed to the housing 1 and the water nozzle 4 respectively, forming two spaced weld marks 8.

[0040] Specifically, such as Figure 5 As shown, the connecting part 61 can be an annular plate of any shape, such as circular or rectangular. Figure 3 and Figure 7 As shown, the water nozzle 4 is inserted into the connecting part 61, which is fitted to the housing 1. The connecting part 61 has an inner welding surface and an outer welding surface spaced apart. The outer periphery of the water nozzle 4 is fully welded to the inner welding interface to form a weld mark 8. The housing 1 is fully welded to the outer welding surface to form another weld mark 8. In this way, the connecting part 61 can be fixedly connected to the housing 1 and the water nozzle 4 by welding, and after welding, two spaced weld marks 8 will be formed at the contact positions between the connecting part 61 and the housing 1 and the water nozzle 4.

[0041] In practical applications, by welding the connecting part 61 to the water nozzle 4 and the housing 1 to form two weld marks 8, the weld marks 8 can play a sealing role while connecting the sealing part 6 to the water nozzle 4 and the sealing part 6 to the housing 1. In this way, not only can the connection stability between the sealing part 6 and the housing 1 and the water nozzle 4 be improved, but the sealing effect of the sealing part 6 can also be improved, further improving the overall sealing effect of the housing 1.

[0042] Optionally, the insert 62 is arranged around the water nozzle 4, and the outer diameter of the insert 62 is smaller than the inner diameter of the first through hole 13; the housing 1 includes an outer side 10, which is away from the through groove 11; the connecting part 61 is fixedly connected to the outer side 10.

[0043] Specifically, such as Figures 3-5 As shown, the embedding part 62 can be an annular sleeve, and the water nozzle 4 passes through the annular sleeve, so that the embedding part 62 is arranged around the water nozzle 4. The outer diameter of the embedding part 62 is smaller than the inner diameter of the first through hole 13, so that the embedding part 62 can be smoothly embedded in the gap 5 between the water nozzle 4 and the wall of the first through hole 13, thereby achieving a good sealing effect.

[0044] The housing 1 has an outer side 10, which is away from the through groove 11, and a first through hole 13 penetrates the outer side 10. During installation, the insert 62 is inserted from the outer side 10 of the housing 1 into the gap 5 between the hole wall of the first through hole 13 and the water nozzle 4. The connecting part 61 fits against the outer side 10, and then the connecting part 61 is fixedly connected to the outer side 10 by welding or other fixed connection methods.

[0045] In practical applications, by fixing the connecting part 61 to the outer surface 10 of the housing 1, the connection between the sealing part 6 and the housing 1 can be easily achieved, thereby improving production efficiency. Specifically, the connecting part 61 is welded to the outer surface 10 of the housing 1. It can also avoid interference with other components inside the housing 1, and improve the compactness and reliability of the overall structure.

[0046] Optionally, the connecting part 61 and the insert part 62 are integrally formed.

[0047] like Figure 5As shown, the connecting part 61 and the insert part 62 can be manufactured by integral molding processes such as die casting and injection molding, so that the connecting part 61 and the insert part 62 can be an integral molded structure.

[0048] In practical applications, the seamless connection 61 and the embedded part 62 further enhance the sealing effect of the sealing component 6 on the gap 5, thus improving the sealing performance of the housing 1. Furthermore, the integrated structure of the connection 61 and the embedded part 62 reduces connection steps and improves production efficiency. Simultaneously, the integrated structure also possesses better structural strength, better withstanding external pressure and vibration, making the sealing component 6 less prone to damage during long-term use and extending its service life.

[0049] Optionally, the sealing member 6 has a second through hole 63, which penetrates the sealing member 6, and the water nozzle 4 is inserted into the second through hole 63. The inner diameter of the second through hole 63 is larger than the outer diameter of the water nozzle 4.

[0050] Specifically, such as Figure 5 As shown, the second through hole 63 can penetrate the connecting part 61 and the embedding part 62 of the sealing member 6. The second through hole 63 is a circular hole, and the water nozzle 4 is also cylindrical. The inner diameter of the second through hole 63 is larger than the outer diameter of the water nozzle 4, so that the water nozzle 4 can be inserted into the second through hole 63. In some embodiments, the inner diameter of the second through hole 63 can be slightly larger than the outer diameter of the water nozzle 4. While ensuring that the water nozzle 4 can be inserted into the second through hole 63, the sealing member 6 can limit and fix the water nozzle 4.

[0051] In practical applications, by making the inner diameter of the second through hole 63 larger than the outer diameter of the water nozzle 4, the water nozzle 4 can be inserted into the second through hole 63 of the sealing member 6 more smoothly, preventing interference between the water nozzle 4 and the sealing member 6.

[0052] Optionally, the box body 1 includes a plurality of side beams 14, which enclose a through groove 11; wherein, a first through hole 13 is provided in the side beam 14.

[0053] like Figure 8 As shown, the box body 1 may include multiple side beams 14, which can be fixedly spliced ​​together by welding or other means, so that the multiple side beams 14 can enclose and form a through groove 11. The number of side beams 14 can be specifically set according to the actual situation. A first through hole 13 is provided through any one of the multiple side beams 14.

[0054] In practical applications, by setting the first through hole 13 on the side beam 14, the first through hole 13 can be pre-drilled on the side beam 14 before multiple side beams 14 are spliced ​​to form the box body 1, so that there is no need to drill the hole after splicing to form the box body 1, which can save time and improve production efficiency.

[0055] For example, when there are four side beams 14, the four side beams 14 can enclose a rectangular through groove 11, and the first through hole 13 can be set on any one of the side beams 14. The specific position can be determined according to the installation requirements of the water tap 4 and the overall design of the battery pack. This application embodiment does not specifically limit this.

[0056] Optionally, the battery pack also includes a sealing piece 7; the side beam 14 has a cavity 141, the cavity 141 has a second opening 142, the second opening 142 communicates with the first through hole 13; the sealing piece 7 is disposed at the second opening 142 and connected to the side beam 14 to cover the second opening 142.

[0057] Specifically, the side beam 14 can be a hollow tubular side beam 14, with a cavity 141 inside. When the side beam 14 is provided with a first through hole 13, such as Figure 9 As shown, the cavity 141 has a second opening 142 formed on the side near the first through hole 13, and this second opening 142 connects the cavity 141 to the first through hole 13. Figure 4 and Figure 10 As shown, the sealing plate 7 can be a sheet-like structure made of metal, such as aluminum alloy. The sealing plate 7 is disposed at the second opening 142 and can be connected to the side beam 14 by welding, snap-fitting, or other means, so that the sealing plate 7 can seal the second opening 142.

[0058] In related technologies, during the processing of the side beam 14, impurities such as metal shavings may remain in the cavity 141 of the side beam 14. These impurities can flow into the first through hole 13 through the second opening 142 of the cavity 141, and then into the receiving cavity 3 through the first through hole 13. These flowing impurities may damage the battery module and other components in the receiving cavity 3, affecting the performance and service life of the battery pack.

[0059] In this embodiment, by setting a sealing piece 7 at the second opening 142 of the side beam 14, the second opening 142 can be effectively sealed, preventing impurities such as metal shavings in the cavity 141 of the side beam 14 from flowing into the first through hole 13 and the receiving cavity 3, thereby protecting components such as the battery module from damage by impurities and improving the safety and reliability of the battery pack.

[0060] In some embodiments, the water tap 4 includes a first connecting portion 61 and a second connecting portion 61 arranged at an angle. The first connecting portion 61 is arranged along a first direction Z and is connected to the liquid cooling plate 2. The second connecting portion 61 passes through the first through hole 13 and extends to the outside of the housing 1. A gap 5 exists between the second connecting portion 61 and the wall of the first through hole 13. The second connecting portion 61 passes through the second through hole 63 of the sealing member 6 and is connected to the sealing member 6, so as to facilitate the connection between the water tap 4 and the housing 1 and the sealing member 6. Further, the angle between the first connecting portion 61 and the second connecting portion 61 can be 90° or approximately 90°.

[0061] In summary, the battery pack provided in this application embodiment has at least the following advantages: In this embodiment, by setting a sealing component, which is connected to the housing and the water nozzle respectively, the sealing component can seal the gap between the water nozzle and the wall of the first through hole, and realize the connection between the water nozzle and the housing. This can reduce the positional requirements of the water nozzle, reduce the amount of machining required for the housing, and thus improve production efficiency and the sealing effect of the housing.

[0062] This application also provides an electrical device, which includes the battery pack described in any of the above embodiments.

[0063] The electrical device can be at least one of a vehicle, mobile phone, tablet computer and wearable device. The specific type of the electrical device is not limited in the embodiments of this application.

[0064] It should be noted that in this embodiment, the structure of the battery pack is the same as that of the battery pack described in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0066] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack having a first orientation (Z), characterized in that, The battery pack includes: The box body (1) is provided with a through groove (11) extending along the first direction (Z) and having a first opening (12). The box body (1) is also provided with a first through hole (13), which communicates with the through groove (11). Liquid cooling plate (2), the liquid cooling plate (2) is connected to one side of the housing (1) along the first direction (Z) and covers the first opening (12) so that at least part of the through groove (11) forms a receiving cavity (3); Water nozzle (4), the water nozzle (4) is partially disposed in the receiving cavity (3) and connected to the liquid cooling plate (2), the water nozzle (4) is partially inserted through the first through hole (13) and extends to the outside of the box body (1), and there is a gap (5) between the water nozzle (4) and the hole wall of the first through hole (13). And a sealing element (6), which is connected to the housing (1) and the water tap (4) respectively to cover the gap (5).

2. The battery pack according to claim 1, characterized in that, The sealing element (6) is at least partially embedded in the gap (5).

3. The battery pack according to claim 2, characterized in that, The sealing component (6) includes a connecting part (61) and an embedding part (62) that are interconnected; wherein, The embedding part (62) is embedded in the gap (5); The connecting part (61) is fixedly connected to the box body (1) and the water tap (4) respectively.

4. The battery pack according to claim 3, characterized in that, The connecting part (61) is welded and fixed to the box body (1) and the water nozzle (4) respectively, forming two spaced weld marks (8).

5. The battery pack according to claim 3, characterized in that, The embedded part (62) is arranged around the water nozzle (4), and the outer diameter of the embedded part (62) is smaller than the inner diameter of the first through hole (13); The housing (1) includes an outer side (10) that is away from the through groove (11) and the first through hole (13) penetrates the outer side (10). The connecting part (61) is welded to the outer side (10).

6. The battery pack according to claim 3, characterized in that, The connecting part (61) and the embedding part (62) are integrally formed.

7. The battery pack according to any one of claims 1-6, characterized in that, The sealing member (6) has a second through hole (63) through which the sealing member (6) passes. The water nozzle (4) is inserted into the second through hole (63). The inner diameter of the second through hole (63) is larger than the outer diameter of the water nozzle (4).

8. The battery pack according to any one of claims 1-6, characterized in that, The box body (1) includes multiple side beams (14), which enclose the through groove (11). The first through hole (13) is provided on the side beam (14).

9. The battery pack according to claim 8, characterized in that, The battery pack also includes a sealing plate (7). The side beam (14) has a cavity (141), the cavity (141) has a second opening (142), and the second opening (142) communicates with the first through hole (13); The sealing piece (7) is disposed at the second opening (142) and connected to the side beam (14) to cover the second opening (142).

10. An electrical appliance, characterized in that, The electrical device includes a battery pack as described in any one of claims 1-9.

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