Battery pack and electrical device

Abstract

Disclosed in the present description are a battery pack and an electrical device. The battery pack comprises: a case body, the case body being provided with an accommodation cavity; a plurality of batteries, the plurality of batteries being arranged in a spaced manner inside the accommodation cavity, and a gap being provided between every two adjacent batteries; and a plurality of supports provided in the accommodation cavity, each support comprising a support body and at least one protrusion surrounding the support body, the support body and a battery being connected in a sealed mode, and the protrusion being arranged on the side of the support body away from the battery. The protrusions are located within the gaps; the protrusions of every two adjacent supports are connected in a sealed mode; and the protrusions isolate part of the gaps to form flow channels for guiding a liquid. In the present application, the flow channels formed between the batteries can guide a cooling liquid and meet requirements for battery housing expansion; and the cooling liquid flowing between the batteries and immersing battery housings improves the cooling efficiency and avoids cooling dead zones, so as to rapidly cool single batteries, thus ensuring the battery safety and prolonging the service life of batteries.

Description

Battery packs and power devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 15, 2023, with application number 202311733471.9 and application name “Battery Pack and Electrical Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to, but are not limited to, the field of battery technology, and specifically to a battery pack and an electrical device. Background Art

[0003] With the continuous development of new energy vehicles, power batteries are widely used as the power source of new energy batteries. Batteries will generate heat during use. Prolonged exposure to high temperatures will shorten the battery life and even cause the risk of thermal runaway. Technical issues

[0004] The present application provides a battery pack and an electrical device, which realizes immersion liquid cooling of single cells to increase cooling efficiency and extend battery life. Technical Solutions

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] In a first aspect, a battery pack is provided, comprising:

[0007] A box body having a receiving cavity;

[0008] A plurality of batteries, wherein the plurality of batteries are arranged in the accommodating cavity at intervals, with a gap between two adjacent batteries;

[0009] a plurality of brackets disposed in the accommodating cavity, the brackets comprising a bracket body and at least one protrusion surrounding the bracket body, the bracket body being sealedly connected to the battery, and the protrusion being disposed on a side of the bracket body away from the battery;

[0010] The protrusion is located in the gap, the protrusions between two adjacent brackets are sealed and connected, and the protrusions isolate part of the gap to form a flow channel for liquid diversion.

[0011] Optionally, it also includes:

[0012] At least one sealing member surrounds the bracket body and is located in the gap, and the sealing member seals and connects two adjacent batteries.

[0013] Optionally, the battery includes a shell and a top cover; the shell includes side walls and a bottom wall connected to the side walls, the side walls and the bottom wall enclose a cavity, and the top cover is connected to the side walls and covers the cavity;

[0014] The bracket body is provided with a groove, the groove has an opening and a groove wall opposite to the opening, the opening is penetrated by part of the side wall, and the groove wall is connected to at least one of the top cover piece and the bottom wall; the groove wall has a through hole passing therethrough, and the opening is connected to the through hole.

[0015] Optionally, each of the batteries is connected to a bracket body, and the bracket body is spaced apart from the bottom wall of the box; the groove wall is connected to the top cover piece, and part of the top cover piece is exposed from the through hole; the protrusion, the side wall of the battery and the bottom wall of the box together enclose the flow channel.

[0016] Optionally, each of the batteries is connected to two of the bracket bodies; one of the two bracket bodies is spaced apart from the bottom wall of the box body, and the groove wall is connected to the top cover piece, and part of the top cover piece is exposed from the through hole; the other of the two bracket bodies is connected to the bottom wall of the box body, and the groove wall is connected to the bottom wall, and part of the bottom wall is exposed from the through hole; the protrusions of the two bracket bodies and the side walls of the battery together enclose the flow channel.

[0017] Optionally, the bracket body includes a first end close to the groove wall and a second end close to the opening; the protrusion is provided with one, and the seal is provided with one; the protrusion surrounds the first end, and the seal surrounds the second end; the seal is located in the flow channel and connected to the protrusion.

[0018] Optionally, the bracket body includes a first end close to the groove wall and a second end close to the opening; one protrusion is provided, and two seals are provided; one of the two seals surrounds the first end and is located outside the flow channel, and the other surrounds the second end and is located inside the flow channel; the protrusion is located between the two seals and is respectively connected to the two seals.

[0019] Optionally, the direction from the second end toward the first end is the thickness direction of the bracket body; the protrusion surrounds the central axis of the bracket body in the thickness direction, and the two sealing members are symmetrically arranged along the protrusion.

[0020] Optionally, the bracket body includes a first end close to the groove wall and a second end close to the opening; there are two protrusions and one sealing member; one of the two protrusions surrounds the first end and the other surrounds the second end; the sealing member is located between the two protrusions and is respectively connected to the two protrusions.

[0021] Optionally, the direction from the second end toward the first end is the thickness direction of the bracket body; the sealing member surrounds the central axis of the bracket body in the thickness direction, and the two protrusions are symmetrically arranged along the sealing member.

[0022] Optionally, a guide portion is provided on a surface of the protrusion close to the first end, and the guide portion surrounds the first end; the guide portions between two adjacent batteries are arranged relative to each other to form a guide groove.

[0023] Optionally, the plurality of brackets are integrally formed; or

[0024] The multiple brackets are detachably connected.

[0025] In a second aspect, the present application also provides an electrical device comprising the battery pack. Beneficial effects

[0026] A battery pack according to an embodiment of the present application includes: a housing having a housing cavity; a plurality of batteries arranged in the housing cavity at intervals, with gaps between adjacent batteries; a plurality of brackets disposed in the housing cavity, the brackets including a bracket body and at least one protrusion surrounding the bracket body, the bracket body being sealed to the battery, the protrusions being disposed on the side of the bracket body away from the battery; the protrusions being located in the gaps, the protrusions between adjacent brackets being sealed, and the protrusions separating part of the gaps to form a flow channel for liquid diversion. Since a flow channel is formed between the batteries, it can guide the coolant and meet the expansion requirements of the battery shell; the coolant flows between the batteries and submerges the battery shell, increasing cooling efficiency and avoiding cooling dead corners. This allows for rapid cooling of the individual batteries, ensuring battery safety and extending battery life.

[0027] The electrical device of the embodiment of the present application may include all the technical features and beneficial effects of the above-mentioned battery pack, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic diagram of a battery pack structure provided in an embodiment of the present application;

[0029] FIG2 is an explosion diagram of FIG1 ;

[0030] FIG3 is a partial schematic diagram of the battery arrangement in FIG1 ;

[0031] FIG4 is a schematic cross-sectional view of a battery pack provided in an embodiment of the present application;

[0032] FIG5 is a partial enlarged schematic diagram of point A in FIG4 ;

[0033] FIG6 is a schematic diagram of a bracket provided in one embodiment of the present application;

[0034] FIG7 is a bottom view of FIG6;

[0035] FIG8 is a partial schematic diagram of the bracket of FIG6 after connection;

[0036] FIG9 is a schematic diagram of the sealing structure provided in an embodiment of the present application;

[0037] FIG10 is a schematic diagram of a bracket provided in another embodiment of the present application;

[0038] FIG11 is a partial schematic diagram of a battery pack using the bracket of FIG10 ;

[0039] FIG12 is a schematic diagram of a bracket provided in yet another embodiment of the present application;

[0040] FIG13 is a partial schematic diagram of a battery pack using the bracket of FIG12;

[0041] Figure markings: 10-box body, 101-accommodating chamber, 20-battery, 201-gap, 202-shell, 203-top cover, 2021-side wall, 2022-bottom wall, 30-bracket, 301-bracket body, 3011-groove, 3012-opening, 3013-groove wall, 3014 through hole, 3015-first end, 3016-second end, 302-protrusion, 3021-guide part, 3022-guide groove, 40-flow channel, 50-seal.

[0042] Implementation Methods of the Application

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. The described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0044] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0045] Referring to Figures 1, 2, 3 and 5, a battery pack includes: a case 10, multiple batteries 20 and multiple brackets 30; the case 10 has a accommodating cavity 101; multiple batteries 20 are arranged at intervals in the accommodating cavity 101, and a gap 201 is provided between two adjacent batteries 20; the bracket 30 is arranged in the accommodating cavity 101, and the bracket 30 includes a bracket body 301 and at least one protrusion 302 surrounding the bracket body 301, the bracket body 301 is sealed with the battery 20, and the protrusion 302 is provided on the side of the bracket body 301 away from the battery 20; the protrusion 302 is located in the gap 201, the protrusion 302 between two adjacent brackets 30 is sealed, and the protrusion 302 isolates part of the gap 201 to form a flow channel 40 for liquid diversion.

[0046] It should be noted that in the battery pack structure of the present application, the gap 201 separated by the protrusion 302 of the bracket 30 creates a flow channel 40, which can guide the coolant and meet the expansion requirements of the battery shell. The coolant flows between the battery cells 20, achieving a soaking effect on at least a portion of the battery shell, which can increase cooling efficiency and avoid cooling dead spots. This can quickly cool the individual cells, ensure battery safety, and extend battery life. At the same time, the connection between the protrusion 302 of two adjacent battery cells 20 prevents short circuits between the cells, improving the safety performance of the battery pack. The connection between the bracket body 301 and the battery 20 also fixes the battery 20, thereby improving the stability of the battery pack.

[0047] In some embodiments, referring to Figures 2, 5, and 9, the battery pack further includes at least one seal 50. The seal 50 surrounds the bracket body 301 and is located in the gap 201. The seal 50 seals two adjacent batteries 20. It will be appreciated that the seal 50 cooperates with the bracket 30 to seal the flow channel 40 between the batteries 20, ensuring the sealing of the immersed cooling liquid in the flow channel 40 and preventing splashing of the immersion liquid within the battery pack.

[0048] In some embodiments, referring to FIG3 , the battery 20 includes a shell 202 and a top cover 203 ; the shell 202 includes a side wall 2021 and a bottom wall 2022 connected to the side wall 2021 , the side wall 2021 and the bottom wall 2022 enclose a cavity, and the top cover 203 is connected to the side wall 2021 and covers the cavity. It can be understood that the battery 20 in FIG3 is a square structure, and the cavity is used to place the electrode assembly, electrolyte, etc. The shell 202 and the top cover 203 are enclosed to ensure that the position of the electrode assembly in the cavity is fixed, and the electrolyte can be prevented from leaking, thereby improving the performance of the battery 20. Of course, the battery 20 is not limited to the square structure in FIG3 , and can also be a cylindrical or other shaped battery. In order to further prevent the influence of the cooling liquid on the battery shell, the shell 202 and the top cover 203 are made of a material with high corrosion resistance and wear resistance to improve the service life of the battery.

[0049] In some embodiments, as shown in Figures 6 and 7 , the bracket body 301 has a groove 3011, which has an opening 3012 and a groove wall 3013 opposite the opening 3012. The opening 3012 is formed through a portion of the side wall 2021, and the groove wall 3013 is connected to at least one of the top cover 203 and the bottom wall 2022. The groove wall 3013 has a through hole 3014 extending therethrough, and the opening 3012 and the through hole 3014 are in communication. The structure of the bracket 30 matches that of the battery 20 to meet the requirements of their connection.

[0050] In some embodiments, referring to FIG11 , each battery 20 is connected to a bracket body 301, and the bracket body 301 is spaced apart from the bottom wall of the box body 10; the groove wall 3013 is connected to the top cover sheet 203, and part of the top cover sheet 203 is exposed from the through hole 3014; the protrusion 302, the side wall 2021 of the battery 20 and the bottom wall of the box body 10 together enclose the flow channel 40. It can be understood that the bracket 30 is arranged on one side of the top cover sheet 203, and at this time the bottom wall 2022 of the battery can be directly fixed on the bottom plate of the box body (not shown in the figure). The bracket 30 is arranged on one side of the top cover sheet 203 to play a certain fixing role for the battery 20. In addition, the through hole 3014 is used to expose the functional areas on the top cover sheet 203, such as the pole, explosion-proof valve, etc., to facilitate the connection and use of the battery 20. The protrusion 302 of the bracket, the side wall 2021 of the battery, and the bottom plate of the box body form a flow channel 40, which achieves rapid immersion cooling of the battery 20 and reduces the risk of thermal runaway.

[0051] In some embodiments, referring to Figures 4 and 5 , each battery 20 is connected to two bracket bodies 301; one of the two bracket bodies 301 is spaced apart from the bottom wall of the housing 10, and the groove wall 3013 is connected to the top cover sheet 203, with a portion of the top cover sheet 203 exposed through the through hole 3014; the other of the two bracket bodies 301 is connected to the bottom wall of the housing 10, and the groove wall 3013 is connected to the bottom wall 2022, with a portion of the bottom wall 2022 exposed through the through hole 3014; the protrusions 302 of the two bracket bodies 301 and the side walls 2021 of the battery 20 together enclose a flow channel 40. Unlike Figure 11 , the brackets 30 are respectively arranged on one side of the top cover sheet 203 and one side of the bottom wall 2022 of the battery, so that the two brackets 30 corresponding to each battery 20 are arranged opposite each other, and the two opposing brackets 30 can fix the spacing between the batteries 20, thereby achieving the fixation of the batteries 20. Furthermore, through-holes 3014 are also used to expose functional areas on top cover 203, such as the terminals and explosion-proof valve, to facilitate connection and use of battery 20. The protrusions 302 of the bracket and the sidewalls 2021 of the battery together form a flow channel 40, enabling rapid immersion cooling of the battery 20 and reducing the risk of thermal runaway.

[0052] In some embodiments, further referring to Figures 5, 6, and 7, a structure of a bracket 30 is provided. The bracket body 301 in the bracket 30 includes a first end 3015 proximate to the groove wall 3013 and a second end 3016 proximate to the opening 3012. The bracket body 301 includes one protrusion 302 and one seal 50. The protrusion 302 surrounds the first end 3015, and the seal 50 surrounds the second end 3016. The seal 50 is positioned within the flow channel 40 and connected to the protrusion 302. It will be appreciated that the first end 3015 of the bracket body 301 surrounds the protrusion 302, thereby isolating the gap 201 between the batteries 20 into the flow channel 40. Furthermore, the placement of the seal 50 within the flow channel 40 and connected to the protrusion 302 improves the sealing of the flow channel 40 and the stability of the battery pack, preventing loosening between the batteries. To ensure a good seal without affecting the volume of the flow channel 40, the side of the seal 50 after it surrounds the second end 3016 is flush with the side of the protrusion 302 after it surrounds the first end 3015.

[0053] In some embodiments, referring to Figures 10 and 11 , another structure of a bracket 30 is provided. The bracket body 301 of the bracket 30 includes a first end 3015 proximate to the groove wall 3013 and a second end 3016 proximate to the opening 3012. There is one protrusion 302 and two sealing members 50. One of the two sealing members 50 surrounds the first end 3015 and is located outside the flow channel 40, while the other surrounds the second end 3016 and is located inside the flow channel 40. The protrusion 302 is located between the two sealing members 50 and is connected to each of the two sealing members 50. In this configuration, the bracket 30 exhibits a convex center with concave edges. The sealing members 50 can be placed along both sides of the protrusion 302, providing multiple seals on the flow channel 40 and improving the sealing effect. Of course, to ensure the sealing effect while not affecting the volume of the flow channel 40, the side surfaces of the sealing members 50 are flush with the side surfaces of the protrusion 302.

[0054] In some embodiments, further referring to FIG10 , the direction from the second end 3016 toward the first end 3015 is the thickness direction of the bracket body 301, and the direction indicated by the arrow in FIG10 is the thickness direction X; the protrusion 302 surrounds the central axis of the bracket body 301 in the thickness direction, and the central axis is shown by the dotted line in FIG10 . In this case, the protrusion 302 is located in the middle of the bracket body 301, and the two sealing members 50 are symmetrically arranged along the protrusion 302. It can be understood that the protrusion 302 surrounds the central axis of the bracket body 301 in the thickness direction, which can make the bracket body 301 more stable and less prone to deformation. The two sets of sealing members 50 are symmetrically arranged along the protrusion 302, which can achieve a double sealing effect to ensure that the electrolyte does not leak. The sealing members 50 on both sides use the same size specifications to facilitate assembly and preparation.

[0055] In some embodiments, referring to Figures 12 and 13 , another structure of a bracket 30 is provided. The bracket body 301 in the bracket 30 includes a first end 3015 adjacent to the groove wall 3013 and a second end 3016 adjacent to the opening 3012. Two protrusions 302 are provided, and one seal 50 is provided. One of the two protrusions 302 surrounds the first end 3015, and the other surrounds the second end 3016. The seal 50 is located between the two protrusions 302 and is connected to each of the two protrusions 302. In this case, the bracket 30 as a whole exhibits a concave center with convex sides. The seal 50 is located in the area between the two sets of protrusions 302. The seal 50 is embedded in the center of the bracket 30 to seal the flow channel 40. To ensure a good sealing effect, the side surfaces of the seal 50 are flush with the side surfaces of the protrusions 302.

[0056] In some embodiments, further referring to FIG12 , the direction from the second end 3016 toward the first end 3015 is the thickness direction of the bracket body 301, and the direction indicated by the arrow in FIG12 is the thickness direction X. The sealing member 50 surrounds the central axis of the bracket body 301 in the thickness direction, the central axis being indicated by the dotted line in FIG12 , and the two protrusions 302 are symmetrically arranged along the sealing member 50. It will be appreciated that the provision of two sets of protrusions 302 and their symmetrical arrangement can ensure the stability of the overall structure of the bracket 30 and enhance the securing effect on the battery 20. The sealing member 50 is located along the central axis of the bracket body 301 in the thickness direction, thereby enhancing the sealing effect between the flow channel 40 and other spaces within the housing 10.

[0057] In some embodiments, further referring to Figures 8 and 13 , a guide portion 3021 is provided on the surface of the protrusion 302 near the first end 3015. The guide portion 3021 surrounds the first end 3015. The guide portions 3021 between two adjacent batteries 20 are disposed opposite each other to form a guide groove 3022. It will be appreciated that the guide groove 3022 is disposed on the edge of the bracket 30 and can serve as a groove for glue flow. Sealant is disposed within the guide groove 3022 and can flow through the guide groove 3022. The guide groove 3022 can cooperate with the sealant to further seal the flow channel 40, thereby improving the sealing of the immersion liquid and preventing leakage of the immersion liquid within the battery pack.

[0058] In some embodiments, multiple brackets 30 are integrally formed and can be formed according to the arrangement of the batteries 20. The integral forming can improve the body stability of the connection of the brackets 30, reduce the assembly process of the brackets, and ensure that the distance and position between the brackets 30 are consistent, thereby improving the consistency and stability of the battery pack.

[0059] In some embodiments, the multiple brackets 30 are detachably connected. A detachable connection refers to a design in which two or more objects are connected by a specific connection method and can be easily removed and reconnected when needed. Examples of detachable connection methods include threaded connections, latch connections, and snap-fit ​​connections. Detachable connections facilitate maintenance and replacement of connected objects, reducing the difficulty and cost of processing and manufacturing.

[0060] In some embodiments, the sealing member 50 may be a sealing foam or a sealing ring.

[0061] In some embodiments, further referring to Figures 1 and 2 , the battery pack further includes an upper cover and a lower cover that seal the housing 10. The upper cover, the lower cover, and the housing together enclose a complete accommodating chamber 101. A liquid inlet and a liquid outlet are also provided on the outer wall of the housing 10; for example, a liquid inlet is provided in the middle of the side wall of the housing 10, and liquid outlets are provided on both sides. Both the liquid inlet and the liquid outlet are connected to the flow channel 40. Coolant enters the flow channel 40 from the liquid inlet, flows through the surface of the battery 20 shell, circulates, and flows out through the liquid outlet, thereby cooling the battery.

[0062] In some embodiments, the battery pack also includes a high-voltage power-off system (BDU) for controlling the flow of current to different loads and an energy distribution unit; a battery management system (BMS) for measuring battery parameters such as voltage, current, and temperature; and high and low voltage plugs arranged on the outside of the box for connecting to the load.

[0063] In some embodiments, the present application also provides an electrical device, including the battery pack provided in this embodiment. Among them, the electrical device can be an application device such as a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle; the spacecraft includes airplanes, rockets, space shuttles, and spacecraft, etc.; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0064] The above is a detailed introduction to the battery pack and electrical device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, wherein: include: A box body, wherein the box body has a containing cavity; A plurality of batteries, wherein the plurality of batteries are arranged in the accommodating cavity at intervals, and a gap is provided between two adjacent batteries; A plurality of brackets are arranged in the accommodating cavity, the brackets include a bracket body and at least one protrusion surrounding the bracket body, the bracket body is sealed and connected to the battery, and the protrusion is arranged on a side of the bracket body away from the battery; The protrusion is located in the gap, the protrusions between two adjacent brackets are sealed and connected, and the protrusions isolate part of the gap to form a flow channel for liquid diversion.

2. The battery pack according to claim 1, wherein: Also includes: At least one sealing member surrounds the bracket body and is located in the gap, and the sealing member seals and connects two adjacent batteries.

3. The battery pack according to claim 2, wherein: The battery comprises a shell and a top cover; the shell comprises a side wall and a bottom wall connected to the side wall, the side wall and the bottom wall enclose a cavity, and the top cover is connected to the side wall and covers the cavity; The bracket body is provided with a groove, the groove has an opening and a groove wall opposite to the opening, the opening is penetrated by part of the side wall, and the groove wall is connected to at least one of the top cover sheet and the bottom wall; the groove wall has a through hole passing therethrough, and the opening is connected to the through hole.

4. The battery pack according to claim 3, wherein: Each of the batteries is connected to a bracket body, and the bracket body is spaced apart from the bottom wall of the box body; the groove wall is connected to the top cover sheet, and part of the top cover sheet is exposed from the through hole; the protrusion, the side wall of the battery and the bottom wall of the box body together enclose the flow channel.

5. The battery pack according to claim 3, wherein: Each of the batteries is connected to two of the bracket bodies; one of the two bracket bodies is spaced apart from the bottom wall of the box body, and the groove wall is connected to the top cover sheet, and part of the top cover sheet is exposed from the through hole; the other of the two bracket bodies is connected to the bottom wall of the box body, and the groove wall is connected to the bottom wall, and part of the bottom wall is exposed from the through hole; the protrusions of the two bracket bodies and the side walls of the battery together enclose the flow channel.

6. The battery pack according to claim 3, wherein: The bracket body includes a first end close to the groove wall and a second end close to the opening; the protrusion is provided with one, and the sealing member is provided with one; the protrusion surrounds the first end, and the sealing member surrounds the second end; the sealing member is located in the flow channel and connected to the protrusion.

7. The battery pack according to claim 4 or 5, wherein: The bracket body includes a first end close to the groove wall and a second end close to the opening; the protrusion is provided with one, and the sealing members are provided with two; one of the two sealing members surrounds the first end and is located outside the flow channel, and the other surrounds the second end and is located inside the flow channel; the protrusion is located between the two sealing members and is respectively connected to the two sealing members.

8. The battery pack according to claim 7, wherein: The direction from the second end toward the first end is the thickness direction of the bracket body; the protrusion surrounds the central axis of the bracket body in the thickness direction, and the two sealing members are symmetrically arranged along the protrusion.

9. The battery pack according to claim 3, wherein: The bracket body includes a first end close to the groove wall and a second end close to the opening; there are two protrusions and one sealing member; one of the two protrusions surrounds the first end and the other surrounds the second end; the sealing member is located between the two protrusions and is respectively connected to the two protrusions.

10. The battery pack according to claim 9, wherein: The direction from the second end toward the first end is the thickness direction of the bracket body; the sealing member surrounds the central axis of the bracket body in the thickness direction, and the two protrusions are symmetrically arranged along the sealing member.

11. The battery pack according to any one of claims 6 or 9, wherein: A guide portion is provided on a surface of the protrusion close to the first end, and the guide portion surrounds the first end; the guide portions between two adjacent batteries are arranged opposite to each other and form a guide groove.

12. The battery pack according to claim 1, wherein: The multiple brackets are integrally formed.

13. The battery pack according to claim 1, wherein: The multiple brackets are detachably connected.

14. An electrical device, wherein: A battery pack comprising any one of claims 1 to 13.

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