Battery pack and electric device

Abstract

The embodiment of the invention provides a battery pack and an electric device. The battery pack comprises a shell, a plurality of battery cells and a first bracket; the plurality of battery cells are arranged in the shell and are arranged along a first direction; the first bracket is arranged in the shell, the first bracket is provided with a first cavity, at least part of each battery cell is accommodated in the first cavity, one part of the first bracket is positioned between the adjacent battery cells, and each battery cell is fixedly connected with the first bracket. The first bracket is provided with the first cavity, so that at least part of each battery cell is accommodated in the first cavity, the part, located in the first cavity, of each battery cell can be protected, and meanwhile, each battery cell is limited and kept; and a part of the first bracket is positioned between the adjacent battery cells, so that a gap can be formed between the adjacent battery cells, an expansion space is provided for the battery cells, and the safety of the battery pack is improved.

Description

Battery packs and electrical devices Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0002] Rechargeable batteries are batteries that can be recharged after discharge to reactivate the active materials and continue to be used. Rechargeable batteries are widely used in electronic devices such as mobile phones and laptops.

[0003] Battery packs typically include multiple cells to meet the voltage requirements of electronic devices. Improving battery pack safety has been a key research topic in the battery technology industry.

[0004] Summary of the Invention

[0005] The present application provides a battery pack and an electrical device, which can improve safety.

[0006] In a first aspect, embodiments of the present application provide a battery pack comprising a housing, a plurality of battery cells, and a first bracket. The plurality of battery cells are disposed within the housing and arranged along a first direction. The first bracket is disposed within the housing and defines a first cavity, wherein at least a portion of each battery cell is accommodated within the first cavity. A portion of the first bracket is positioned between adjacent battery cells, and each battery cell is fixedly connected to the first bracket.

[0007] By providing a first cavity on the first bracket, at least a portion of each battery cell is accommodated in the first cavity, thereby protecting the portion of each battery cell located in the first cavity and limiting the position of each battery cell; and by locating a portion of the first bracket between adjacent battery cells, a gap can be formed between adjacent battery cells to provide expansion space for the battery cells, thereby improving the safety of the battery pack.

[0008] In some embodiments, the first bracket includes a first substrate, a first wall, a second wall, a third wall, and a fourth wall. The first wall, the second wall, the third wall, and the fourth wall are connected to the first substrate. The first wall and the third wall are opposite each other, and the second wall and the fourth wall are opposite each other. The first wall, the second wall, the third wall, the fourth wall, and the first substrate together form a first cavity. The plurality of battery cells are fixedly connected to the first substrate.

[0009] The first wall, the second wall, the third wall and the fourth wall are integrally formed and have good structural strength.

[0010] In some embodiments, a battery cell includes a cell housing, an electrode assembly, and an electrode terminal. The cell housing includes a first portion and a second portion that are connected. The electrode assembly is disposed within the first portion. A portion of the electrode terminal is disposed within the first portion and connected to the electrode assembly, while another portion of the electrode terminal extends beyond the cell housing.

[0011] The first portion of the cell casing protects the electrode assembly, while the electrode terminals connect the electrode assembly to other electrical components outside the cell casing. The second portion defines the extension direction of the electrode terminals, reducing the risk of bending at the electrode terminal's interface with the electrode assembly.

[0012] In some embodiments, the second portion includes a first sealing portion, a second sealing portion, and a third sealing portion, the second sealing portion and the third sealing portion are respectively located on both sides of the first portion in the second direction, the first portion has a first side in the third direction, the first sealing portion is located on the first side, the first sealing portion is respectively connected to the second sealing portion and the third sealing portion, another portion of the electrode terminal extends from the first sealing portion, and the first direction, the second direction, and the third direction are perpendicular to each other.

[0013] The first sealing part, the second sealing part and the third sealing part cooperate to seal the first part, so that a closed space is formed inside the first part for accommodating the electrode assembly, thereby effectively sealing and protecting the electrode assembly.

[0014] In some embodiments, the first side of the first portion is at least partially disposed in the first cavity and connected to the first substrate.

[0015] In some embodiments, the first side of the first portion has a surface, the surface is disposed toward the first substrate, and the surface and the first substrate are connected via an adhesive.

[0016] The first substrate can define the shape of the first side of the first portion, thereby reducing deformation of the first side of the first portion due to force.

[0017] In some embodiments, the first substrate is provided with a plurality of first through holes, the plurality of first through holes are arranged at intervals along the first direction, the first through holes are extended along the second direction and penetrate the first substrate along the third direction, at least a portion of the first sealing portion passes through the first substrate through the first through holes, and each electrode terminal extends from one side of the first substrate through the first through holes to the other side of the first substrate.

[0018] In some embodiments, a boss is provided at a position corresponding to each first through hole on the other side of the first substrate, and a second through hole is provided on the boss. The second through hole passes through the boss along a third direction and is connected to the first through hole. Along the third direction, the projection of the second through hole covers or is equal to the projection of the first through hole. At least a portion of the first sealing portion is located in the first through hole and the second through hole, and the electrode terminal passes through the first through hole and the second through hole from one side of the first substrate and extends to the other side of the first substrate.

[0019] Along the third direction, the first through hole provides space for the first sealing portion to extend along the third direction, thereby guiding the extension direction of the electrode terminal in the third direction. In addition, the first through hole can limit the first sealing portion in the first direction and the second direction.

[0020] In some embodiments, a connection between the first sealing portion and the second sealing portion forms a first folded corner portion, and a connection between the first sealing portion and the third sealing portion forms a second folded corner portion.

[0021] In some embodiments, a plurality of first recesses are provided on a side of the first wall opposite to the third wall, and the plurality of first recesses are arranged at intervals along the first direction; a plurality of second recesses are provided on a side of the third wall opposite to the first wall, and the plurality of second recesses are arranged at intervals along the first direction; the plurality of first recesses and the plurality of second recesses are arranged correspondingly in the second direction, and the first part is at least partially provided between the relative first recesses and the second recesses.

[0022] The first recess and the second recess allow the battery cell to be partially placed in the second direction, and the first recess and the second recess relative to each other can cooperate with each other to protect the battery cell in the second direction and limit the battery cell.

[0023] In some embodiments, the first substrate is provided with a plurality of first openings, each first opening passes through the first substrate along a third direction and is connected to the first recess and the second recess, the first corner portion is located at the first opening connected to the first recess, and the second corner portion is located at the first opening connected to the second recess.

[0024] The first opening provides a space for the first corner portion and the second corner portion to be arranged, thereby reducing the possibility of the first corner portion and the second corner portion being bent and damaged after the battery cell and the first bracket are assembled.

[0025] In some embodiments, the battery pack further includes a second bracket, which is also disposed inside the outer shell. The second bracket is provided with a second cavity, and each battery cell is at least partially accommodated in the second cavity. In the first direction, a portion of the second bracket is located between adjacent battery cells, and at least a portion of each battery cell is located between the first bracket and the second bracket.

[0026] In some embodiments, the second bracket includes a second substrate, a fifth wall, a sixth wall, a seventh wall and an eighth wall, the fifth wall, the sixth wall, the seventh wall and the eighth wall are connected to the second substrate, the fifth wall is opposite to the seventh wall, the sixth wall is opposite to the eighth wall, the fifth wall, the sixth wall, the seventh wall, the eighth wall and the second substrate form a second cavity, the second side of the first part is at least partially disposed in the second cavity and connected to the second substrate, and a plurality of battery cells are fixedly connected to the second substrate.

[0027] The fifth wall, the sixth wall, the seventh wall, the eighth wall and the second substrate are integrally formed, and have good structural strength. The second substrate can limit the shape of the second side of the first part in the third direction, reducing deformation of the second side of the first part.

[0028] In some embodiments, a plurality of third recesses are provided on the side of the fifth wall opposite to the seventh wall, and the plurality of third recesses are arranged at intervals along the first direction; a plurality of fourth recesses are provided on the side of the seventh wall opposite to the fifth wall, and the plurality of fourth recesses are arranged at intervals along the first direction; the plurality of third recesses and the plurality of fourth recesses are arranged correspondingly in the second direction, and the first part is at least partially provided between the relative third recesses and the fourth recesses.

[0029] The third recess and the fourth recess allow the battery cell to be partially placed in the second direction, and the third recess and the fourth recess relative to each other can cooperate with each other to protect the battery cell in the second direction and limit the battery cell.

[0030] In some embodiments, the first portion has a second side in the third direction, the second side is opposite to the first side, a portion of the second sealing portion protrudes from the second side and forms a first protrusion, and a portion of the third sealing portion protrudes from the second side and forms a second protrusion.

[0031] In some embodiments, the second substrate is provided with a plurality of second openings, each second opening passes through the second substrate along the third direction and is connected to the corresponding third recess and fourth recess, the first protrusion is at least partially located in the second opening connected to the third recess, and the second protrusion is at least partially located in the second opening connected to the fourth recess.

[0032] The second opening provides a setting space for the first protrusion and the second protrusion, thereby reducing the bending and damage of the first protrusion and the second protrusion after the battery cell and the second bracket are assembled, and improving the sealing effect between the end of the second sealing part away from the first sealing part and the first part, and between the end of the third sealing part away from the first sealing part and the first part.

[0033] In some embodiments, the second substrate has a protrusion extending toward the battery cell along the third direction, and the protrusion extends along the first direction between the fifth wall and the seventh wall, and the second side of the first part is connected to the protrusion.

[0034] By providing a raised portion on the basis of the second opening of the second substrate, the space for the first and second raised portions is increased in the third direction, thereby improving protection for the first and second raised portions and reducing the risk of bending and damage to the first and second raised portions. The raised portion can support the second side of the first portion in the third direction, thereby cooperating with the first substrate to support and position the battery cell in the third direction.

[0035] In some embodiments, the battery pack further includes a circuit board, which is disposed within the housing and located on a side of the first bracket away from the first cavity, and is connected to each electrode terminal. The circuit board can be used to manage and maintain each battery cell.

[0036] In some embodiments, a support portion is provided on the inner side of the housing, and the circuit board is mounted on the support portion to facilitate installation and fixation of the circuit board, reduce relative displacement of the circuit board relative to the housing and the battery cells, and improve the effectiveness of the connection between the circuit board and the battery cells.

[0037] In a second aspect, an embodiment of the present application provides an electric device, comprising an electric main body and a battery pack as described in the first aspect, wherein the battery pack supplies power to the electric main body. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application.

[0039] FIG1 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

[0040] FIG2 is a schematic structural diagram of a battery pack provided in some embodiments of the present application;

[0041] FIG3 is an exploded view of a battery pack provided in some embodiments of the present application;

[0042] FIG4 is a schematic diagram of the structure of one side of a first bracket of a battery pack provided in some embodiments of the present application;

[0043] FIG5 is a schematic diagram of the structure of a battery cell of a battery pack provided in some embodiments of the present application;

[0044] FIG6 is a front view of a cell of a battery pack provided in some embodiments of the present application;

[0045] FIG7 is an exploded view of a battery cell of a battery pack provided in some embodiments of the present application;

[0046] FIG8 is a schematic structural diagram of another side of a first bracket of a battery pack provided in some embodiments of the present application;

[0047] FIG9 is a top view of a partial structure of a battery pack provided by some embodiments of the present application;

[0048] FIG10 is a cross-sectional view along line AA in FIG9 ;

[0049] Figure 11 is an enlarged view of point C in Figure 10;

[0050] Figure 12 is an enlarged view of point D in Figure 10;

[0051] FIG13 is a cross-sectional view along line BB in FIG9;

[0052] Figure 14 is an enlarged view of point E in Figure 13;

[0053] FIG15 is a side view of a partial structure of a battery pack provided by some embodiments of the present application;

[0054] FIG16 is a cross-sectional view along line FF in FIG15;

[0055] FIG17 is an enlarged view of point H in FIG16;

[0056] FIG18 is a cross-sectional view taken along line GG in FIG15 ;

[0057] FIG19 is an enlarged view of point I in FIG18;

[0058] FIG20 is a schematic diagram of the structure of one side of a second bracket of a battery pack provided in some embodiments of the present application;

[0059] FIG21 is a schematic structural diagram of another side of a second bracket of a battery pack provided in some embodiments of the present application;

[0060] FIG22 is a bottom view of a partial structure of a battery pack provided by some embodiments of the present application;

[0061] FIG23 is an enlarged view of point J in FIG22;

[0062] FIG24 is a schematic structural diagram of a battery pack provided in some embodiments of the present application.

[0063] The reference numerals in the specific embodiment are as follows:

[0064] 1. Housing; 11. First housing; 12. Second housing; 13. Support portion;

[0065] 2. Battery cell; 21. Battery cell case; 211. First portion; 211a. Surface; 2111. First side; 2112. Second side; 212. Second portion; 2121. First sealing portion; 2122. Second sealing portion; 2123. Third sealing portion; 2124. First corner portion; 2125. Second corner portion; 2126. First convex portion; 2127. Second convex portion; 213. First packaging portion; 2131. First region; 2132. Second region; 214. Second packaging portion; 2141. Third region; 2142. Fourth region; 22. Electrode assembly; 23. Electrode terminal;

[0066] 3. First bracket; 31. First cavity; 32. First substrate; 32a. Plane; 321. First through hole; 322. First opening; 323. Boss; 3231. Second through hole; 33. First wall; 331. First recess; 34. Second wall; 35. Third wall; 351. Second recess; 36. Fourth wall;

[0067] 4. Second bracket; 41. Second cavity; 42. Second substrate; 421. Second opening; 422. Raised portion; 43. Fifth wall; 431. Third recess; 44. Sixth wall; 45. Seventh wall; 451. Fourth recess; 46. Eighth wall;

[0068] 5. Circuit board;

[0069] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0071] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0072] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0073] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0074] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 80° to 90°, they are considered perpendicular; if the angle between two directions is 0° to 10°, they are considered parallel.

[0075] The battery pack and electrical device of the present application are described below with reference to the accompanying drawings.

[0076] As shown in Figures 1 to 4, an embodiment of the present application provides a battery pack, comprising a housing 1, a plurality of battery cells 2, and a first bracket 3. The plurality of battery cells 2 are disposed within the housing 1, and the plurality of battery cells 2 are arranged along a first direction X. The first bracket 3 is disposed within the housing 1, and the first bracket 3 defines a first cavity 31, wherein at least a portion of each battery cell 2 is accommodated within the first cavity 31. A portion of the first bracket 3 is positioned between adjacent battery cells 2, and each battery cell 2 is fixedly connected to the first bracket 3.

[0077] The housing 1 has a space inside, and each battery cell 2 and the first bracket 3 are disposed in the space. The plurality of battery cells 2 are arranged along the first direction X at intervals.

[0078] The multiple battery cells 2 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 2 are connected in series and in parallel.

[0079] Each battery cell 2 is connected to a first bracket 3, and the first bracket 3 is connected to the housing 1. The housing 1 can protect each battery cell 2 and the first bracket 3 to prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 2.

[0080] In the embodiment of the present application, by providing a first cavity 31 on the first bracket 3, at least a portion of each battery cell 2 is accommodated in the first cavity 31, which can protect the portion of each battery cell 2 located in the first cavity 31 and limit the position of each battery cell 2; and by positioning a portion of the first bracket 3 between adjacent battery cells 2, a gap can be formed between adjacent battery cells 2 to provide expansion space for the battery cells 2, thereby improving the safety of the battery pack.

[0081] As shown in Figures 5 to 7, in some embodiments, the battery cell 2 includes a battery cell shell 21, an electrode assembly 22 and an electrode terminal 23. The electrode assembly 22 is housed in the battery cell shell 21. The interior of the battery cell shell 21 is also filled with an electrolyte. The electrode assembly 22 includes a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 2 can work by moving metal ions between the positive electrode sheet and the negative electrode sheet. One end of the electrode terminal 23 extends to the outside of the battery cell shell 21 and is used to be electrically connected to an external circuit, and the other end of the electrode terminal 23 extends into the interior of the battery cell shell 21 and is used to be electrically connected to the electrode assembly 22. The electrode terminal 23 is used to electrically connect the electrode assembly 22 to an external circuit to enable charging and discharging of the battery cell 2.

[0082] The battery cell 2 may be a lithium-ion battery cell 2, a sodium-lithium-ion battery cell 2, a sodium-ion battery cell 2, a magnesium-ion battery cell 2, or other types of battery cells 2, which are not limited in the present embodiment. Optionally, the battery cell 2 is a soft-pack battery cell 2.

[0083] Exemplarily, the cell housing 21 is made of an aluminum-plastic film.

[0084] The cell casing 21 includes a first portion 211 and a second portion 212 connected to each other. The electrode assembly 22 is disposed within the first portion 211. A portion of the electrode terminal 23 is located within the first portion 211 and connected to the electrode assembly 22, while the other portion of the electrode terminal 23 extends out of the cell casing 21.

[0085] The first portion 211 of the cell casing 21 protects the electrode assembly 22, and the electrode terminal 23 is used to connect the electrode assembly 22 to other electrical components outside the cell casing 21. The second portion 212 defines the extension direction of the electrode terminal 23, reducing the risk of bending of the electrode terminal 23 at the location where it connects to the electrode assembly 22.

[0086] Exemplarily, two electrode terminals 23 are provided, wherein one electrode terminal 23 is used to be electrically connected to the positive electrode plate, and the other electrode terminal 23 is used to be electrically connected to the negative electrode plate.

[0087] As shown in Figures 5 and 6, in some embodiments, the second portion 212 includes a first sealing portion 2121, a second sealing portion 2122 and a third sealing portion 2123. The second sealing portion 2122 and the third sealing portion 2123 are respectively located on both sides of the first portion 211 in the second direction Y. The first portion 211 has a first side 2111 in the third direction Z. The first sealing portion 2121 is located on the first side 2111 of the first portion 211 in the third direction Z. The first sealing portion 2121 is respectively connected to the second sealing portion 2122 and the third sealing portion 2123. Another portion of the electrode terminal 23 extends from the first sealing portion 2121. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0088] The first sealing portion 2121 , the second sealing portion 2122 and the third sealing portion 2123 cooperate to seal the first portion 211 , so that a sealed space is formed inside the first portion 211 for accommodating the electrode assembly 22 , thereby effectively sealing and protecting the electrode assembly 22 .

[0089] For example, as shown in FIG7 , the cell casing 21 includes a first packaging portion 213 and a second packaging portion 214 connected to each other. The first packaging portion 213 and the second packaging portion 214 can be folded along the connection position so that the first packaging portion 213 and the second packaging portion 214 overlap, thereby enclosing the electrode assembly 22. In other embodiments, the first packaging portion 213 and the second packaging portion 214 can be two separate independent components.

[0090] For example, as shown in FIG7 , the first packaging portion 213 includes a first region 2131 and a second region 2132 extending outward from the periphery of the first region 2131. The second packaging portion 214 includes a third region 2141 and a fourth region 2142 extending outward from the periphery of the third region 2141. After the first and second packaging portions 213 and 214 are folded along the connection, the first and third regions 2131 and 2141 cooperate to form the first portion 211, which holds the electrode assembly 22. The second and fourth regions 2132 and 2142 overlap and are sealed together to form the second portion 212. The electrode terminal 23 extends from between the second and fourth regions 2132 and 2142 to electrically connect the electrode assembly 22 to an external circuit.

[0091] In some embodiments, the connection between the first sealing portion 2121 and the second sealing portion 2122 forms a first angled portion 2124, and the connection between the first sealing portion 2121 and the third sealing portion 2123 forms a second angled portion 2125. The first angled portion 2124 and the second angled portion 2125 are bent toward the first portion 211. When assembling the battery cell 2 with the first bracket 3, the second sealing portion 2122 and the third sealing portion 2123 can reduce obstruction to the assembly between the first portion 211 and the first bracket 3.

[0092] In some embodiments, the first portion 211 has a second side 2112 in the third direction Z, and the first side 2111 is disposed opposite the second side 2112. Along the third direction Z, a portion of the second sealing portion 2122 protrudes from the second side 2112 of the first portion 211 to form a first protrusion 2126; along the third direction Z, a portion of the third sealing portion 2123 protrudes from the second side 2112 of the first portion 211 to form a second protrusion 2127.

[0093] As shown in Figure 4, in some embodiments, the first bracket 3 includes a first substrate 32, a first wall 33, a second wall 34, a third wall 35 and a fourth wall 36. The first wall 33, the second wall 34, the third wall 35 and the fourth wall 36 are connected to the first substrate 32, the first wall 33 and the third wall 35 are opposite to each other along the second direction Y, and the second wall 34 and the fourth wall 36 are opposite to each other along the first direction X. The first wall 33, the second wall 34, the third wall 35, the fourth wall 36 and the first substrate 32 enclose a first cavity 31, and each battery cell 2 is fixedly connected to the first substrate 32.

[0094] The first wall 33 , the second wall 34 , the third wall 35 and the fourth wall 36 are integrally formed and have good structural strength.

[0095] Optionally, the first bracket 3 is made by injection molding.

[0096] Optionally, the first bracket 3 is manufactured by cutting and hollowing out.

[0097] In some embodiments, the first side 2111 of the first portion 211 has a surface 211a, which is disposed toward the first substrate 32. The first portion 211 is at least partially disposed within the first cavity 31, and the surface 211a is connected to the first substrate 32. Optionally, the surface 211a is in contact with the first substrate 32. Optionally, the surface 211a is connected to the first substrate 32 via an adhesive, such as glue.

[0098] The first substrate 32 can define the shape of the first side 2111 of the first portion 211 , thereby reducing deformation of the first side 2111 of the first portion 211 due to force.

[0099] As shown in Figures 4 and 8 to 9, in some embodiments, the first substrate 32 is provided with a plurality of first through holes 321, and the plurality of first through holes 321 are arranged at intervals along the first direction X. The first through holes 321 extend along the second direction Y and penetrate the first substrate 32 along the third direction Z. At least a portion of the first sealing portion 2121 passes through the first substrate 32 through the first through hole 321, and at least a portion of each electrode terminal 23 extends from one side of the first substrate 32 through the first through hole 321 to the other side of the first substrate 32.

[0100] In some embodiments, the width of the first sealing portion 2121 along the third direction Z is less than the thickness of the first substrate 32. The first sealing portion 2121 is entirely located within the first through-hole 321. The first through-hole 321 provides space for the first sealing portion 2121 along the third direction Z, allowing it to extend along the third direction Z. This allows the first sealing portion 2121 to guide the extension direction of the electrode terminal 23 in the third direction Z. Furthermore, the first through-hole 321 can limit the first sealing portion 2121 in both the first direction X and the second direction Y.

[0101] In some embodiments, the first side of the first substrate 32 forms a flat surface 32a on either side of each first through hole 321 in the first direction X. The flat surface 32a is connected to the surface 211a, reducing the risk of deformation of the surface 211a under stress. Optionally, the flat surface 32a is in contact with the surface 211a. Optionally, the flat surface 32a is connected to the surface 211a using an adhesive, such as glue.

[0102] In some embodiments, as shown in Figure 4, a plurality of first recesses 331 are provided on the side of the first wall 33 opposite to the third wall 35, and the plurality of first recesses 331 are arranged at intervals along the first direction X. A plurality of second recesses 351 are provided on the side of the third wall 35 opposite to the first wall 33, and the plurality of second recesses 351 are arranged at intervals along the first direction X. The plurality of first recesses 331 and the plurality of second recesses 351 are arranged correspondingly in the second direction Y, and the first portion 211 is at least partially provided between the opposing first recesses 331 and the second recesses 351.

[0103] The first recess 331 and the second recess 351 provide for partial placement of the battery cell 2 in the second direction Y. The opposing first recess 331 and second recess 351 can cooperate with each other in the second direction Y to protect and position the battery cell 2. Optionally, the shapes of the first recess 331 and the second recess 351 can coordinate with the shapes of the edges of the battery cell 2 in the second direction Y, allowing the battery cell 2 to be smoothly placed between the opposing first recess 331 and second recess 351. Optionally, along the second direction Y, the maximum distance between the first recess 331 and the opposing second recess 351 is greater than the maximum width of the first portion 211, facilitating assembly of the battery cell 2 and the first bracket 3.

[0104] In some embodiments, when the battery cell 2 is placed between the first recess 331 and the second recess 351, there is a gap fit between the battery cell 2 and the first recess 331 and between the battery cell 2 and the second recess 351. The gap between the battery cell 2 and the first recess 331 and between the battery cell 2 and the second recess 351 can provide expansion space for the battery cell 2, thereby reducing the extrusion wear on the battery cell 2 caused by the first recess 331 and the second recess 351.

[0105] Optionally, the gap between the battery cell 2 and the first recess 331 is 0.2 mm to 0.3 mm, which facilitates the first recess 331 to limit the battery cell 2 and can provide expansion space for the battery cell 2. Optionally, the gap between the battery cell 2 and the second recess 351 is 0.2 mm to 0.3 mm, which facilitates the second recess 351 to limit the battery cell 2 and can provide expansion space for the battery cell 2.

[0106] In some embodiments, when the battery cell 2 is placed between the first recess 331 and the second recess 351 , the battery cell 2 and the first recess 331 and the battery cell 2 and the second recess 351 are connected by an adhesive, such as glue.

[0107] In some embodiments, when the battery cell 2 is placed between the first recess 331 and the second recess 351 , the battery cell 2 and the first recess 331 , as well as the battery cell 2 and the second recess 351 , are in direct contact and connection.

[0108] As shown in Figures 7 to 9, 16 and 17, in some embodiments, the first substrate 32 is provided with a plurality of first openings 322, each first opening 322 is arranged corresponding to a first recess 331 and a second recess 351, each first opening 322 passes through the first substrate 32 along the third direction Z, and is connected to the first recess 331 and the second recess 351, the first corner portion 2124 is located at the first opening 322 connected to the first recess 331, and the second corner portion 2125 is located at the first opening 322 connected to the second recess 351.

[0109] Optionally, along the first direction X, the maximum length of the first opening 322 is greater than the thickness of the battery cell 2, and in the plane defined by the first direction X and the second direction Y, the first opening 322 is roughly fan-shaped, and the radius of the fan-shape formed by the first opening 322 is greater than the width of the first corner portion 2124 and the width of the second corner portion 2125.

[0110] Optionally, when the first angled portion 2124 and the second angled portion 2125 are placed in the corresponding first openings 322, they will not come into contact with the first substrate 32. The first openings 322 provide space for the first angled portion 2124 and the second angled portion 2125, thereby reducing the risk of the first angled portion 2124 and the second angled portion 2125 being bent and damaged after the battery cell 2 and the first bracket 3 are assembled, and improving the sealing effect at the connection between the first sealing portion 2121 and the second sealing portion 2122, and at the connection between the first sealing portion 2121 and the third sealing portion 2123.

[0111] As shown in Figures 8 to 11, in some embodiments, a boss 323 is provided on the second side of the first substrate 32 at a position corresponding to each first through-hole 321. The boss 323 is provided with a second through-hole 3231. The second through-hole 3231 passes through the boss 323 along the third direction Z and communicates with the first through-hole 321. Along the third direction Z, the projection of the second through-hole 3231 overlaps or is equal to the projection of the first through-hole 321. The first sealing portion 2121 is at least partially located within the first through-hole 321 and the second through-hole 3231, thereby enhancing the position of the first sealing portion 2121. The electrode terminal 23 extends from one side of the first substrate 32 through the first through-hole 321 and the second through-hole 3231 and extends to the other side of the first substrate 32.

[0112] On the basis of the first substrate 32 and the first through hole 321, by setting the boss 323 and the second through hole 3231, the setting space of the first sealing part 2121 is increased in the third direction Z, and the boss 323 and the first substrate 32 cooperate with the first direction X and the second direction Y to limit the first sealing part 2121, thereby reducing the bending and damage of the first sealing part 2121.

[0113] Optionally, along the third direction Z, the sum of the thickness of the boss 323 and the thickness of the first substrate 32 is greater than or equal to the width of the first sealing portion 2121, so that the first sealing portion 2121 is completely located in the first through hole 321 and the second through hole 3231, thereby improving the protection of the first sealing portion 2121.

[0114] In some embodiments, the first sealing portion 2121 and the first through hole 321 are clearance-fitted, which facilitates the first sealing portion 2121 passing through the first through hole 321. Optionally, along the first direction X, there is a 0.1 mm gap between the first sealing portion 2121 and the walls of the first through hole 321 on both sides.

[0115] In some embodiments, a clearance fit is formed between the first sealing portion 2121 and the second through hole 3231, which facilitates the first sealing portion 2121 to pass through the second through hole 3231. Optionally, along the first direction X, a clearance of 0.1 mm is provided between the first sealing portion 2121 and the walls of the second through hole 3231 on both sides.

[0116] As shown in Figures 10, 12, 13, 15, 18 and 20 to 22, in some embodiments, the battery pack further includes a second bracket 4, which is disposed inside the outer shell 1, and the second bracket 4 is provided with a second cavity 41, and each battery cell 2 is at least partially accommodated in the second cavity 41. In the first direction X, a portion of the second bracket 4 is located between adjacent battery cells 2, and at least a portion of each battery cell 2 is located between the first bracket 3 and the second bracket 4, and each battery cell 2 is fixedly connected to the second bracket 4.

[0117] Each battery cell 2 is partially placed in the first cavity 31 on the first side of the third direction Z, the first bracket 3 protects the battery cell 2 on the first side of the third direction Z, and each battery cell is partially placed in the second cavity 41 on the second side of the third direction Z, the second bracket 4 protects the battery cell 2 on the second side of the third direction Z, and the first bracket 3 and the second bracket 4 cooperate to limit each battery cell 2; a gap is formed between adjacent battery cells 2 by part of the first bracket 3 and part of the second bracket 4 to provide expansion space for the battery cell 2.

[0118] By adjusting the width of the portion of the first bracket 3 located between adjacent battery cells 2 in the first direction X and the width of the portion of the second bracket 4 located between adjacent battery cells 2 in the first direction X, the distance between adjacent battery cells 2 can be adjusted.

[0119] As shown in Figure 20, in some embodiments, the second bracket 4 includes a second substrate 42, a fifth wall 43, a sixth wall 44, a seventh wall 45 and an eighth wall 46. The fifth wall 43, the sixth wall 44, the seventh wall 45 and the eighth wall 46 are connected to the second substrate 42, the fifth wall 43 and the seventh wall 45 are opposite to each other along the second direction Y, and the sixth wall 44 and the eighth wall 46 are opposite to each other along the first direction X. The fifth wall 43, the sixth wall 44, the seventh wall 45, the eighth wall 46 and the second substrate 42 enclose a second cavity 41, the first portion 211 is at least partially disposed in the second cavity 41 on the second side 2112 in the third direction Z and is connected to the second substrate 42, and the multiple battery cells 2 are fixedly connected to the second substrate 42.

[0120] Optionally, the first portion 211 is at least partially disposed in the second cavity 41 on the second side 2112 in the third direction Z and is in contact with and connected to the second substrate 42. Optionally, the first portion 211 is at least partially disposed in the second cavity 41 on the second side 2112 in the third direction Z and is connected to the second substrate 42 via an adhesive, such as glue.

[0121] The fifth wall 43, the sixth wall 44, the seventh wall 45, the eighth wall 46, and the second base plate 42 are integrally formed, providing good structural strength. The second base plate 42 can define the shape of the second side 2112 of the first portion 211 in the third direction Z, thereby reducing deformation of the second side 2112 of the first portion 211.

[0122] Optionally, the second bracket 4 is made by injection molding.

[0123] Optionally, the second bracket 4 is manufactured by cutting and hollowing.

[0124] As shown in Figure 20, in some embodiments, a plurality of third recesses 431 are provided on the side of the fifth wall 43 opposite to the seventh wall 45, and the plurality of third recesses 431 are arranged at intervals along the first direction X. A plurality of fourth recesses 451 are provided on the side of the seventh wall 45 opposite to the fifth wall 43, and the plurality of fourth recesses 451 are arranged at intervals along the first direction X. The plurality of third recesses 431 and the plurality of fourth recesses 451 are arranged correspondingly in the second direction Y, and the first portion 211 is at least partially provided between the opposing third recesses 431 and the fourth recesses 451.

[0125] The third recess 431 and the fourth recess 451 are provided for partially inserting the battery cell 2 in the second direction Y. The third recess 431 and the fourth recess 451 facing each other can cooperate with each other in the second direction Y to protect the battery cell 2 and limit the battery cell 2 .

[0126] Optionally, the shapes of the third recess 431 and the fourth recess 451 can match the shapes of the edges of the battery cell 2 on both sides in the second direction Y, so that the battery cell 2 can be smoothly placed between the opposing third recess 431 and the opposing fourth recess 451. Optionally, along the second direction Y, the maximum distance between the third recess 431 and the opposing fourth recess 451 is greater than the maximum width of the first portion 211 in the second direction Y, which facilitates the assembly of the battery cell 2 and the second bracket 4.

[0127] In some embodiments, when the battery cell 2 is placed between the third recess 431 and the fourth recess 451, there is a clearance fit between the battery cell 2 and the third recess 431, and between the battery cell 2 and the fourth recess 451. The clearance between the battery cell 2 and the third recess 431, and between the battery cell 2 and the fourth recess 451, provides space for the battery cell 2 to expand, reducing the extrusion wear caused by the third recess 431 and the fourth recess 451 on the battery cell 2. Optionally, a clearance of 0.2 mm to 0.3 mm between the battery cell 2 and the third recess 431 facilitates the third recess 431 to restrain the battery cell 2, providing space for the battery cell 2 to expand. Optionally, a clearance of 0.2 mm to 0.3 mm between the battery cell 2 and the fourth recess 451 facilitates the fourth recess 451 to restrain the battery cell 2, providing space for the battery cell 2 to expand.

[0128] In some embodiments, when the battery cell 2 is placed between the third recess 431 and the fourth recess 451, the battery cell 2 and the third recess 431, as well as the battery cell 2 and the fourth recess 451, are connected by an adhesive, such as glue. In some embodiments, when the battery cell 2 is placed between the third recess 431 and the fourth recess 451, the battery cell 2 and the third recess 431, as well as the battery cell 2 and the fourth recess 451, are directly connected.

[0129] As shown in Figures 13, 14 and 18 to 23, in some embodiments, the second substrate 42 is provided with a plurality of second openings 421, each second opening 421 is arranged corresponding to a third recess 431 and a fourth recess 451, each second opening 421 passes through the second substrate 42 along the third direction Z, and is connected with the corresponding third recess 431 and fourth recess 451, the first protrusion 2126 is located at the second opening 421 connected with the third recess 431, and the second protrusion 2127 is located at the second opening 421 connected with the fourth recess 451.

[0130] In some embodiments, along the first direction X, the length of the second opening 421 is greater than the length of the first protrusion 2126, thereby reducing the risk of contact between the first protrusion 2126 and the second substrate 42. Along the second direction Y, the length of the second opening 421 is greater than the length of the first protrusion 2126, thereby reducing the risk of contact between the first protrusion 2126 and the second substrate 42.

[0131] In some embodiments, along the first direction X, the length of the second opening 421 is greater than the length of the second protrusion 2127, reducing the risk of contact between the second protrusion 2127 and the second substrate 42. Along the second direction Y, the length of the second opening 421 is greater than the length of the second protrusion 2127, reducing the risk of contact between the second protrusion 2127 and the second substrate 42.

[0132] The second opening 421 provides space for the first protrusion 2126 and the second protrusion 2127 to be installed, thereby reducing the possibility of the first protrusion 2126 and the second protrusion 2127 being bent and damaged after the battery cell 2 and the second bracket 4 are assembled, and improving the sealing effect between the end of the second sealing portion 2122 away from the first sealing portion 2121 and the first part 211, and between the end of the third sealing portion 2123 away from the first sealing portion 2121 and the first part 211.

[0133] As shown in Figures 19 and 20, in some embodiments, the second substrate 42 has a raised portion 422 extending toward the battery cell 2 along the third direction Z. The raised portion 422 extends along the first direction X between the fifth wall 43 and the seventh wall 45. The second side 2112 of the first portion 211 is at least partially connected to the raised portion 422. Optionally, the second side 2112 of the first portion 211 is at least partially in contact with the raised portion 422. Optionally, the second side 2112 of the first portion 211 is at least partially connected to the raised portion 422 via an adhesive, such as glue.

[0134] Optionally, a cross-section of the protrusion 422 in a plane defined by the second direction Y and the third direction Z is trapezoidal.

[0135] In some embodiments, along the third direction Z, the thickness of the first protrusion 2126 is less than or equal to the sum of the thickness of the protrusion 422 and the thickness of the second substrate 42 , which helps to reduce the risk of the first protrusion 2126 extending out of the second bracket 4 and improve the protection of the battery cell 2 .

[0136] In some embodiments, along the third direction Z, the thickness of the second protrusion 2127 is less than or equal to the sum of the thickness of the protrusion 422 and the thickness of the second substrate 42 , which helps to reduce the risk of the second protrusion 2127 extending out of the second bracket 4 and improve the protection of the battery cell 2 .

[0137] Based on the second opening 421 of the second substrate 42, the protrusion 422 is provided to increase the space for the first protrusion 2126 and the second protrusion 2127 in the third direction Z. This improves the protection of the first protrusion 2126 and the second protrusion 2127 and reduces the risk of bending and damage to the first protrusion 2126 and the second protrusion 2127. The protrusion 422 can support the second side 2112 of the first portion 211 in the third direction Z, thereby cooperating with the first substrate 32 to support and limit the battery cell 2 in the third direction Z.

[0138] In some embodiments, each battery cell 2 is secured to the first bracket 3 by gluing. Glue is applied to at least a portion of the flat surface 32a of the first substrate 32, and the surface 211a of the first portion 211 of each battery cell 2 is gluingly secured to the glued flat surface 32a. Each battery cell 2 is also secured to the second bracket 4 by gluing. Structural glue is applied to the raised portion 422. The first portion 211 of each battery cell 2 is gluingly secured to the raised portion 422 on the second side 2112 in the third direction Z. This secures the relative positions of the battery cell 2 to the first bracket 3 and the second bracket 4, and improves the connection strength between the battery cell 2 and the first bracket 3 and / or the second bracket 4.

[0139] In some embodiments, the first bracket 3 and the housing 1 are fixed by gluing, and / or the second bracket 4 and the housing 1 are fixed by gluing, so as to fix the relative positions of the first bracket 3, the second bracket 4 and the housing 1 and improve the connection strength between the first bracket 3 and / or the second bracket 4 and the housing 1.

[0140] In some embodiments, when the first bracket 3 and the second bracket 4 are glued and fixed to the shell 1, glue is applied to the inner surface of the shell 1 at positions corresponding to the two sides of the first bracket 3 in the second direction Y, and structural glue is applied to the inner surface of the shell 1 at positions corresponding to the two sides of the second bracket 4 in the second direction Y, and the coating height of the glue in the third direction Z is greater than the thickness of the first bracket 3 and the second bracket 4 in the third direction Z.

[0141] In some embodiments, the housing 1 includes a first shell 11 and a second shell 12 , and the first shell 11 and the second shell 12 enclose a space.

[0142] The first shell 11 and the second shell 12 can be connected as a whole by bonding, fastener connection or other means to cover each other and jointly define a space for accommodating the battery cell 2.

[0143] Optionally, the first shell 11 and the second shell 12 are snap-fitted.

[0144] Optionally, the first shell 11 and the second shell 12 may also be fixed by bonding with structural adhesive.

[0145] In some embodiments, the battery pack further includes a circuit board 5, which may include a BMS (Battery Management System) assembly. The BMS assembly includes multiple electronic components that can implement functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery cells 2. The circuit board 5 can be used to manage and maintain each battery cell 2. The circuit board 5 is disposed within the housing 1 and is located on a side of the first bracket 3 away from the first cavity 31, that is, the circuit board 5 is located on the side of the first bracket 3 not provided with the first cavity 31. The circuit board 5 is connected to each electrode terminal 23 to control the charging and discharging of the battery cells 2.

[0146] As shown in FIG24 , in some embodiments, a support portion 13 is provided on the inner side of the housing 1, and the circuit board 5 is connected to the support portion 13. This allows the circuit board 5 to be installed and fixed in position, reduces displacement of the circuit board 5 relative to the housing 1 and the battery cells 2, and improves the effectiveness of the connection between the circuit board 5 and the battery cells 2.

[0147] Optionally, there are two supporting portions 13 , which are respectively disposed on two opposite inner surfaces of the housing in the first direction X or the second direction Y. The circuit board 5 is connected to the two supporting portions 13 on both sides in the first direction X or the second direction Y.

[0148] Optionally, the circuit board 5 and the support portion 13 are glued and fixed to reduce the situation where the circuit board 5 and the support portion 13 shake relative to each other and thus affect the electrical connection effect between each electrode terminal 23 and the circuit board 5 .

[0149] The battery pack provided in the embodiment of the present application is conducive to reducing the need to set foam between adjacent battery cells 2, on the top of the battery cells 2, and on the bottom of the battery cells 2, thereby improving assembly efficiency and reducing costs; at the same time, it can reduce or eliminate the glue filling step, thereby reducing or eliminating the cost caused by glue filling.

[0150] In a second aspect, an embodiment of the present application provides an electric device, comprising an electric main body and a battery pack as described in the first aspect, wherein the battery pack is connected to the electric main body and supplies power to the electric main body.

[0151] The battery pack may be the battery pack provided by any of the above embodiments.

[0152] An electrical device is a device that performs a set function when driven by electrical energy. Electrical devices may include portable devices, laptop computers, electric toys and tools, energy storage systems, and the like. Power tools include metal cutting tools and cleaning tools, such as electric drills, electric wrenches, vacuum cleaners, and robot vacuums. The present application does not impose any specific restrictions on these electrical devices.

[0153] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions within the scope of the claims.

Claims

1. A battery pack comprising: shell; a plurality of battery cells, disposed in the housing and arranged along a first direction; as well as The first bracket is arranged in the shell, the first bracket is provided with a first cavity, at least part of each of the battery cells is accommodated in the first cavity, a part of the first bracket is located between adjacent battery cells, and the multiple battery cells are fixedly connected to the first bracket.

2. The battery pack according to claim 1, wherein: The first bracket includes a first substrate, a first wall, a second wall, a third wall and a fourth wall, the first wall, the second wall, the third wall and the fourth wall are connected to the first substrate, the first wall is opposite to the third wall, the second wall is opposite to the fourth wall, the first wall, the second wall, the third wall, the fourth wall and the first substrate enclose to form the first cavity, and the multiple battery cells are fixedly connected to the first substrate.

3. The battery pack according to claim 2, wherein: The battery cell comprises: A battery cell housing, comprising a first portion and a second portion connected to each other; an electrode assembly disposed inside the first portion; and An electrode terminal, a portion of which is located inside the first portion and connected to the electrode assembly, and another portion of which extends out of the battery cell casing.

4. The battery pack according to claim 3, wherein: The second portion includes a first sealing portion, a second sealing portion, and a third sealing portion. The second sealing portion and the third sealing portion are respectively located on both sides of the first portion in the second direction. The first portion has a first side in the third direction. The first sealing portion is located on the first side. The first sealing portion is connected to the second sealing portion and the third sealing portion, respectively. Another portion of the electrode terminal extends from the first sealing portion. The first direction, the second direction, and the third direction are perpendicular to each other.

5. The battery pack according to claim 4, wherein: The first side of the first portion is at least partially disposed in the first cavity and connected to the first substrate.

6. The battery pack according to claim 5, wherein: The first side of the first portion has a surface, the surface is disposed toward the first substrate, and the surface and the first substrate are connected by an adhesive.

7. The battery pack according to claim 5, wherein: The first substrate is provided with a plurality of first through holes, which are arranged at intervals along the first direction, and the first through holes are extended along the second direction and penetrate the first substrate along the third direction, at least a portion of the first sealing portion passes through the first substrate through the first through holes, and each of the electrode terminals extends from one side of the first substrate through the first through holes to the other side of the first substrate.

8. The battery pack according to claim 7, wherein: A boss is provided at a position corresponding to each of the first through holes on the other side of the first substrate, and a second through hole is provided on the boss. The second through hole passes through the boss along the third direction and is connected to the first through hole. Along the third direction, the projection of the second through hole covers or is equal to the projection of the first through hole. At least a portion of the first sealing portion is located in the first through hole and the second through hole, and the electrode terminal passes through the first through hole and the second through hole from one side of the first substrate and extends to the other side of the first substrate.

9. The battery pack according to any one of claims 4 to 8, wherein: A first folded corner portion is formed at a connection between the first sealing portion and the second sealing portion, and a second folded corner portion is formed at a connection between the first sealing portion and the third sealing portion.

10. The battery pack according to claim 9, wherein: A plurality of first recesses are provided on a side of the first wall opposite to the third wall, and the plurality of first recesses are arranged at intervals along the first direction. A plurality of second recesses are provided on a side of the third wall opposite to the first wall, and the plurality of second recesses are arranged at intervals along the first direction. The plurality of first recesses and the plurality of second recesses are arranged correspondingly in the second direction, and the first part is at least partially provided between the first recess and the second recess relative to each other.

11. The battery pack according to claim 10, wherein: The first substrate is provided with a plurality of first openings, each of the first openings passes through the first substrate along the third direction and is connected to the first recess and the second recess, the first corner portion is located at the first opening connected to the first recess, and the second corner portion is located at the first opening connected to the second recess.

12. The battery pack according to claim 9, wherein: The battery pack also includes a second bracket, which is also arranged inside the shell. The second bracket is provided with a second cavity, and each of the battery cells is at least partially accommodated in the second cavity. In the first direction, a portion of the second bracket is located between adjacent battery cells, and at least a portion of each of the battery cells is located between the first bracket and the second bracket. The multiple battery cells are fixedly connected to the second bracket.

13. The battery pack according to claim 12, wherein: The second bracket includes a second substrate, a fifth wall, a sixth wall, a seventh wall and an eighth wall, the fifth wall, the sixth wall, the seventh wall and the eighth wall are connected to the second substrate, the fifth wall is opposite to the seventh wall, the sixth wall is opposite to the eighth wall, the fifth wall, the sixth wall, the seventh wall, the eighth wall and the second substrate enclose a second cavity, the second side of the first portion is at least partially disposed in the second cavity and connected to the second substrate, and the multiple battery cells are fixedly connected to the second substrate.

14. The battery pack according to claim 13, wherein: A plurality of third recesses are provided on a side of the fifth wall opposite to the seventh wall, and the plurality of third recesses are arranged at intervals along the first direction. A plurality of fourth recesses are provided on a side of the seventh wall opposite to the fifth wall, and the plurality of fourth recesses are arranged at intervals along the first direction. The plurality of third recesses and the plurality of fourth recesses are arranged correspondingly in the second direction, and the first part is at least partially provided between the opposite third recesses and the fourth recesses.

15. The battery pack according to claim 14, wherein: The first portion has a second side in the third direction, the second side is opposite to the first side, a portion of the second sealing portion protrudes from the second side and forms a first convex portion, and a portion of the third sealing portion protrudes from the second side and forms a second convex portion.

16. The battery pack according to claim 15, wherein: The second substrate is provided with a plurality of second openings, each of the second openings penetrates the second substrate along the third direction and is connected to the corresponding third recess and the fourth recess, the first convex portion is at least partially located in the second opening connected to the third recess, and the second convex portion is at least partially located in the second opening connected to the fourth recess.

17. The battery pack according to claim 13, wherein: The second substrate is provided with a protrusion, which extends toward the battery core along the third direction and extends along the first direction between the fifth wall and the seventh wall. The second side of the first portion is connected to the protrusion.

18. The battery pack according to claim 3, wherein: The battery pack further includes a circuit board, which is disposed in the housing and located on a side of the first bracket away from the first cavity, and the circuit board is connected to each of the electrode terminals.

19. The battery pack according to claim 18, wherein: A supporting portion is provided on the inner side of the shell, and the circuit board is connected to the supporting portion.

20. An electrical device comprising an electrical main body and the battery pack according to any one of claims 1 to 19, wherein the battery pack supplies power to the electrical main body.

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