Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, the battery pack comprises a battery pack, the battery pack comprises a plurality of batteries arranged along a first direction, and each battery comprises a shell; the side plates are arranged on at least one side of the battery pack in the third direction, and each side plate comprises a metal part and a first plastic part which are connected with each other in the second direction; the metal part extends along the first direction and is attached to the shells of the plurality of batteries; the first plastic part extends along a first direction, and at least part of the first plastic part is attached to the shells of the plurality of batteries; wherein the first direction, the second direction and the third direction intersect in pairs. The side plate is divided into the metal part and the first plastic part, the metal part meets the connection strength with the battery shell, and the first plastic part can reduce the overall weight of the side plate and can also improve the insulation effect of the side plate; the manufacturing cost of the side plate is reduced, and the large-batch production requirement can be met.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to battery packs and electrical devices. Background Art

[0002] In the power battery system, the battery pack includes multiple battery groups. In order to improve the stability of the battery group structure, it is usually necessary to set side panels on both sides of the battery group to fix the structure of the battery group. The side panels surround the battery group and can also provide physical protection for the battery to prevent the impact of external impact on the battery. However, conventional side panels are made of metal, which are heavy and costly to prepare, and cannot meet the needs of mass industrialization. Utility Model Content

[0003] Purpose of the utility model: The embodiments of the present application provide a battery pack and an electrical device, which aim to reduce the manufacturing cost by reducing the weight of the side panels of the battery pack.

[0004] Technical solution: The battery pack described in the embodiment of the present application includes:

[0005] A battery pack, the battery pack comprising a plurality of batteries arranged along a first direction, the battery comprising a housing;

[0006] At least one side plate is arranged on at least one side of the battery pack in the third direction, and the side plate includes a metal part and a first plastic part connected to each other in the second direction; the metal part extends along the first direction and fits with the shells of the multiple batteries; the first plastic part extends along the first direction, and at least part of the first plastic part fits with the shells of the multiple batteries; wherein the first direction, the second direction and the third direction intersect each other.

[0007] In some embodiments, the shell includes two first side walls arranged opposite to each other along the third direction, two second side walls arranged opposite to each other along the first direction, and a bottom wall connected to the first side walls and the second side walls; the two first side walls, the two second side walls and the bottom wall enclose a receiving cavity; the battery further includes a top cover sheet, which is connected to the shell and covers the receiving cavity;

[0008] The bottom wall and the top cover sheet are spaced apart along the second direction, and the first side walls of the plurality of batteries are located in the same plane and extend along the first direction; the metal part is connected to the first side wall.

[0009] In some embodiments, the top cover sheet includes a pole;

[0010] The first plastic part includes a first extension section and a first bending section, the first extension section is connected to the metal part, and the first bending section is connected to a side of the first extension section away from the metal part; at least a portion of the first extension section is in contact with the first side wall; at least a portion of the first bending section is in contact with the top cover sheet, and an end portion of the first bending section is arranged toward the pole.

[0011] In some embodiments, the side panel further comprises:

[0012] The second plastic part is connected to a side of the metal part away from the first plastic part in the second direction; the second plastic part extends along the first direction, and at least a part of the second plastic part is in contact with the shells of the plurality of batteries.

[0013] In some embodiments, the second plastic portion includes a second extension segment, the second extension segment is connected to the metal portion; at least a portion of the second extension segment is in contact with the first side wall.

[0014] In some embodiments, it also includes:

[0015] end plates, located at two opposite ends of the battery pack along the first direction and connected to the second side wall;

[0016] A bending portion, wherein the bending portion is located at two opposite ends of the metal portion along the first direction and connected to the metal portion, and at least a portion of the bending portion is connected to the end plate.

[0017] In some embodiments, the metal portion has a maximum dimension H in the second direction. 1 mm, the first side wall has a maximum dimension H in the second direction 2 mm, satisfying: 0.10≤H 1 / H 2 ≤0.95.

[0018] In some embodiments, the metal portion includes:

[0019] A first body, the first body comprising a first end and a second end opposite to each other along the second direction Y;

[0020] A first thinning portion, the first thinning portion is disposed at the first end, the first thinning portion has a plurality of first through holes, the first extending section covers the first thinning portion, and a portion of the first extending section fills the first through holes;

[0021] The second thinning portion is arranged at the second end, the second thinning portion has a plurality of second through holes, the second extension section covers the second thinning portion, and a part of the second plastic portion fills the second through holes.

[0022] In some embodiments, the metal portion includes:

[0023] A first body, the first body comprising a first end and a second end opposite to each other along the second direction Y;

[0024] a first convex portion, the first convex portion is disposed at the first end, the first extension section has a first concave portion, the first convex portion is penetrated through the first concave portion and connected to an inner wall of the first concave portion;

[0025] A second convex portion is provided at the second end, the second extension section has a second concave portion, the second convex portion passes through the second concave portion and is connected to an inner wall of the second concave portion.

[0026] In some embodiments, the first extension section includes a second body and a transition section, and the transition section is connected to the second body and the metal part respectively.

[0027] In some embodiments, a side surface of the transition section is a curved surface.

[0028] In some embodiments, it also includes:

[0029] The bonding portion is located between the metal portion and the first side wall and connects the metal portion and the first side wall respectively.

[0030] In some embodiments, the present application also provides an electrical device, including the battery pack.

[0031] Beneficial effects: The battery pack of the embodiment of the present application includes: a battery pack, the battery pack includes a plurality of batteries arranged along a first direction, and the batteries include a shell; at least one side plate, the side plate is arranged on at least one side of the battery pack in a third direction, and the side plate includes a metal part and a first plastic part connected to each other in a second direction; the metal part extends along the first direction and fits with the shells of the plurality of batteries; the first plastic part extends along the first direction, and at least part of the first plastic part fits with the shells of the plurality of batteries; wherein the first direction, the second direction and the third direction intersect in pairs. The present application divides the side plate into a metal part and a first plastic part, wherein the metal part satisfies the connection strength with the battery shell, and the first plastic part can reduce the overall weight of the side plate and improve the insulation effect of the side plate; the present application reduces the preparation cost of the side plate and can meet the needs of mass production.

[0032] The electric 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

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 An exploded schematic diagram of a battery pack structure provided in an embodiment of the present application;

[0035] Figure 2 An exploded schematic diagram of a side panel structure provided in an embodiment of the present application;

[0036] Figure 3 A side view of a side panel structure provided in an embodiment of the present application;

[0037] Figure 4 A partial schematic diagram of the injection-molding connection between the first plastic part and the metal part provided in an embodiment of the present application;

[0038] Figure 5 A partial schematic diagram of the injection-molding connection between the second plastic part and the metal part provided in an embodiment of the present application;

[0039] Figure 6 A side view of another side panel structure provided in an embodiment of the present application;

[0040] Figure 7 A partial schematic diagram of the first plastic part and the metal part being clamped together according to an embodiment of the present application;

[0041] Figure 8 A partial schematic diagram of the second plastic part and the metal part being clamped together according to an embodiment of the present application;

[0042] Fig. 9 A schematic diagram of the structure of the first plastic part provided in the application embodiment;

[0043] Fig.10 A schematic diagram of a first bending section provided in an embodiment of the present application being arranged toward a pole;

[0044] Figure markings: 1-battery pack, 2-side plate, 3-end plate, 4-bending portion, 5-adhesive portion, 11-battery, 111-shell, 112-top cover sheet, 1121-pole, 1111-first side wall, 1112-second side wall, 1113-bottom wall, 21-metal portion, 211-first body, 2111-first end, 2112-second end, 212-first thinning portion, 2121-first through hole, 213-second thinning portion, 2131-second through hole, 214-first convex portion, 2211-first concave portion, 215-second convex portion, 22-first plastic portion, 221-first extension section, 222-first bending section, 23-second plastic portion, 231-second extension section, 2311-second concave portion, 2212-second body, 2213-transition section. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0046] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0047] See also Figure 1 and Figure 2 The embodiment of the present application provides a battery pack, including a battery pack 1 and at least one side plate 2; the battery pack 1 includes a plurality of batteries 11 arranged along a first direction X, and the battery 11 includes a shell 111; the side plate 2 is arranged on at least one side of the battery pack 1 in a third direction Z, and the side plate 2 includes a metal part 21 and a first plastic part 22 connected to each other in a second direction Y; the metal part 21 extends along the first direction X and is attached to the shells 111 of the plurality of batteries 11; the first plastic part 22 extends along the first direction X, and at least a portion of the first plastic part 22 is attached to the shells 111 of the plurality of batteries 11; wherein the first direction X, the second direction Y and the third direction Z intersect each other.

[0048] It can be understood that the side panel 2 of the present application includes a metal part 21 and a first plastic part 22, and the metal part 21 is made of metal material, such as aluminum alloy, stainless steel, etc.; the metal part 21 can ensure the overall tensile strength of the side panel 2 to ensure that the side panel 2 can resist external forces; at the same time, the metal part 21 is also used to connect with the battery shell 111 to meet the fixed connection between the side panel 2 and the battery 11, improve the connection strength between the side panel 2 and the battery 11, and realize the protection of the battery 11 by the side panel 2; the first plastic part 22 is made of polymer materials, such as polyethylene, polypropylene, polycarbonate, etc.; the first plastic part 22 can partially replace the metal material part of the side panel 2 to reduce the overall weight of the side panel 2, and the first plastic part 22 also has insulating properties, which can improve the overall insulation effect of the side panel 2; the side panel of this embodiment has a smaller weight, a low preparation cost, and can meet the needs of mass production.

[0049] It should be noted that the first direction X, the second direction Y and the third direction Z are Figure 1 The first direction X, the second direction Y and the third direction Z are applicable to all drawings. The first direction X, the second direction Y and the third direction Z are preferably intersected in pairs by being perpendicular to each other.

[0050] In some embodiments, see further Figure 1 and Fig.10 The shell 111 includes two first side walls 1111 arranged opposite to each other along the third direction Z, two second side walls 1112 arranged opposite to each other along the first direction X, and a bottom wall 1113 connected to the first side walls 1111 and the second side walls 1112; the two first side walls 1111, the two second side walls 1112 and the bottom wall 1113 enclose a receiving cavity, and the battery also includes a top cover sheet 112, which is connected to the shell 111 and covers the receiving cavity; the bottom wall 1113 is spaced from the top cover sheet 112 along the second direction Y, and the first side walls 1111 of the plurality of batteries 11 are located in the same plane and extend along the first direction X; the metal part 21 is connected to the first side wall 1111. It should be noted that the connection between the metal part 21 and the first side wall 1111 can ensure the structural stability of the battery pack 1 and reduce the risk of loosening or displacement; the sealed connection between the top cover sheet 112 and the shell 111 can effectively seal the accommodating cavity and prevent foreign matter from entering the shell; the first side walls 1111 of the batteries 11 are located in the same plane and extend along the first direction X. This arrangement can improve the compactness and balance of the battery pack 1 and ensure that the connection between the batteries 11 is stable and reliable.

[0051] In some embodiments, see further Figure 3 , Fig. 9 and Fig.10, the top cover sheet 112 includes a pole 1121; the first plastic part 22 includes a first extension section 221 and a first bending section 222, the first extension section 221 is connected to the metal part 21, and the first bending section 222 is connected to the side of the first extension section 221 away from the metal part 21; at least a portion of the first extension section 221 is in contact with the first side wall 1111; at least a portion of the first bending section 222 is in contact with the top cover sheet 112, and the end of the first bending section 222 is arranged toward the pole 1121. It should be noted that the battery pack 1 needs to undergo rigorous environmental testing experiments during the design process, such as high temperature and high humidity environment testing, condensation testing, etc. In a high humidity environment, the battery pack is prone to poor insulation due to the short creepage distance between the pole and the side plate of the battery. In this embodiment, by adopting the first plastic part 22, the electrical gap and creepage distance between the pole 1121 and the metal part 21 of the side plate are increased, the insulation is improved, and a better insulation effect is achieved. See further Figure 3 The end of the first bending section 222 can be understood as a side surface of the first bending section 222 that is closest to the pole 1121, and at least part of the first bending section 222 being in contact with the top cover sheet 112 can be understood as a bottom surface on the first bending section 222 that is connected to the end is directly connected to the surface of the top cover sheet 112; when the first bending section 222 is in contact with the top cover sheet 112, the side panel 2 can also reinforce the battery 11 to further improve the stability of the installation of the battery 11.

[0052] In some embodiments, see further Figure 2 The side panel 2 also includes: a second plastic part 23, the second plastic part 23 is connected to the side of the metal part 21 away from the first plastic part 22 in the second direction Y; the second plastic part 23 extends along the first direction X, and at least part of the second plastic part 23 is in contact with the shell 111 of the plurality of batteries 11. It should be noted that for some batteries with an insulating film coated on the outside of the battery shell, and the insulating film has a window on the bottom wall 1113 to expose part of the shell, the electrical gap and creepage distance between the window on the bottom wall of the insulating film and the metal part 21 of the side panel 2 can be increased by further providing the second plastic part 23, so as to ensure its insulation and enhance the insulation effect. The second plastic part 23 is made of polymer materials, such as polyethylene, polypropylene, polycarbonate, etc.

[0053] In some embodiments, see further Figure 3 and Figure 1 The second plastic part 23 includes a second extension section 231, which is connected to the metal part 21, and at least a portion of the second extension section 231 is in contact with the first side wall 1111. The contact between the second extension section 231 and the first side wall 1111 can further improve the connection strength between the side plate 2 and the battery housing 111, and enhance the protection of the battery pack 1 by the side plate 2.

[0054] In some embodiments, see further Figure 1 and Fig.10 The battery pack further includes: an end plate 3 and a bending portion 4; the end plate 3 is located at two opposite ends of the battery pack 1 along the first direction X and is connected to the second side wall 1112; the bending portion 4 is located at two opposite ends of the metal part 21 along the first direction X and is connected to the metal part 21, and at least a portion of the bending portion 4 is connected to the end plate 3. It should be noted that the end plate 3 is connected to the second side wall 1112, providing additional support and stability. The bending portion 4 is located at two opposite ends of the metal part 21 along the first direction X and is connected to the metal part 21. The design of the bending portion 4 can provide additional strength and rigidity, and increase the compressive strength of the metal part 21; at least a portion of the bending portion 4 is connected to the end plate 3, ensuring a firm connection between the metal part 21 and the end plate 3; the design of the end plate 3 and the bending portion 4 enables the battery pack 1 to occupy a smaller space in the first direction X. This compact structure can save space and facilitate the installation and application of the battery pack under limited space conditions.

[0055] In some embodiments, the metal portion 21 has a maximum dimension H in the second direction Y. 1 mm, the first side wall 1111 has a maximum dimension H in the second direction Y. 2 mm, satisfying: 0.10≤H 1 / H 2 ≤0.95. For example, H 1 / H 2 The value of can be any one of 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95 or a range between any two values. When the above range is met, it can ensure that the metal portion 21 of the side panel meets the tensile strength requirement and improve the overall structural strength of the side panel 2.

[0056] In some embodiments, the thickness range of the metal part 21 is 0.5mm-3mm. It should be noted that the thickness of the metal part 21 refers to the maximum dimension of the metal part 21 in the third direction Z. This dimension can be measured with a vernier caliper. Setting the thickness of the metal part 21 within this range can ensure the strength of the metal part while ensuring that the occupied space is not too large, thereby improving the energy density.

[0057] In some embodiments, see further Figure 2 , Figure 4 and Figure 5The metal part 21 includes a first body 211, a first thinning part 212 and a second thinning part 213; the first body 211 includes a first end 2111 and a second end 2112 opposite to each other along the second direction Y: the first thinning part 212 is arranged at the first end 2111, the first thinning part 212 has a plurality of first through holes 2121, the first extension section 221 covers the first thinning part 212, and a portion of the first extension section 221 fills the first through holes 2121; the second thinning part 213 is arranged at the second end 2112, the second thinning part 213 has a plurality of second through holes 2131, the second extension section 231 covers the second thinning part 213, and a portion of the second plastic part 23 fills the second through holes 2131.

[0058] It should be noted that, since the metal part 21 and the first plastic part 22 and the second plastic part 23 are made of different materials, in order to improve the connection effect between them, the first plastic part 22, the second plastic part 23 and the metal part 21 are molded by injection molding. Among them, the first through hole 2121 and the second through hole 2131 are arranged at intervals in the first direction X. When the first plastic part 22 and the second plastic part 23 are injection molded, the first extension section 221 or the second extension section 231 will be embedded in the through hole to ensure the connection stability between the metal part 21 and the first plastic part 22 and the second plastic part 23 respectively. Therefore, the design of the thinning part and the existence of the through hole can facilitate the filling operation of the first extension section 221 and the second extension section 231, making the manufacturing process more convenient and efficient.

[0059] In some embodiments, see further Figure 6 , Figure 7 and Figure 8 The metal part 21 includes a first body 211, a first convex portion 214 and a second convex portion 215. The first body 211 includes a first end 2111 and a second end 2112 opposite to each other along the second direction Y: the first convex portion 214 is arranged at the first end 2111, the first extension section 221 has a first recess 2211, the first convex portion 214 is penetrated through the first recess 2211 and connected to the inner wall of the first recess 2211; the second convex portion 215 is arranged at the second end 2112, the second extension section 231 has a second recess 2311, the second convex portion 215 is penetrated through the second recess 2311 and connected to the inner wall of the second recess 2311.

[0060] It should be noted that, in order to further improve the preparation efficiency, a detachable connection can be adopted between the metal part 21 and the first plastic part 22 and the second plastic part 23. The detachable connection refers to a design in which two or more objects are connected by a certain connection method and can be easily disassembled and reconnected when needed. The detachable connection method includes threaded connection, latch connection, snap connection, etc. The detachable connection can facilitate the maintenance and replacement of the connected objects, reducing the difficulty and cost of processing and manufacturing. Specifically, through the cooperation of the first convex part 214 and the first concave part 2211, and the cooperation of the second convex part 215 and the second concave part 2311, the splicing of the metal part 21 with the first plastic part 22 and the second plastic part 23 is achieved, which improves the assembly efficiency and simplifies the preparation process.

[0061] In some embodiments, see further Fig. 9 The first extension section 221 includes a second body 2212 and a transition section 2213, and the transition section 2213 is respectively connected to the second body 2212 and the metal part 21. It can be understood that one side of the transition section 2213 is a curved surface, and the transition section 2213 is preferably a rounded transition section, which can achieve a transition connection between the metal part 21 and the first plastic part 22, and can relieve stress and ensure the connection strength.

[0062] In some embodiments, see Figure 1 The battery pack further includes: a bonding portion 5, which is located between the metal portion 21 and the first side wall 1111 and respectively connects the metal portion 21 and the first side wall 1111. It can be understood that the bonding portion 5 is used to improve the connection effect between the metal portion 21 and the first side wall 1111, and the bonding portion 5 uses an insulating structural adhesive to ensure the insulation between the side plate 2 and the battery 11.

[0063] In some embodiments, see further Figure 1 The battery pack 1 also includes structural parts, such as an upper cover, a flexible circuit board, etc. The battery pack 1 is installed in the battery pack to reduce the maintenance risk of the battery pack.

[0064] In some embodiments, this embodiment further 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, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical devices.

[0065] The secondary battery and the electrical device provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery pack (1), the battery pack (1) comprising a plurality of batteries (11) arranged along a first direction (X), the battery (11) comprising a housing (111); At least one side plate (2), the side plate (2) being arranged on at least one side of the battery pack (1) in a third direction (Z), the side plate (2) comprising a metal part (21) and a first plastic part (22) connected to each other in a second direction (Y); the metal part (21) extending along the first direction (X) and being in contact with the shells (111) of the plurality of batteries (11); the first plastic part (22) extending along the first direction (X), at least a portion of the first plastic part (22) being in contact with the shells (111) of the plurality of batteries (11); wherein the first direction (X), the second direction (Y) and the third direction (Z) intersect each other.

2. The battery pack according to claim 1, characterized in that: The shell (111) comprises two first side walls (1111) arranged opposite to each other along a third direction (Z), two second side walls (1112) arranged opposite to each other along a first direction (X), and a bottom wall (1113) connected to the first side walls (1111) and the second side walls (1112); the two first side walls (1111), the two second side walls (1112) and the bottom wall (1113) enclose a receiving cavity; the battery further comprises a top cover sheet (112), the top cover sheet (112) being connected to the shell (111) and covering the receiving cavity; The bottom wall (1113) and the top cover sheet (112) are spaced apart along the second direction (Y), and the first side walls (1111) of the plurality of batteries (11) are located in the same plane and extend along the first direction (X); the metal part (21) is connected to the first side wall (1111).

3. The battery pack according to claim 2, characterized in that: The top cover sheet (112) comprises a pole (1121); The first plastic part (22) comprises a first extension section (221) and a first bending section (222); the first extension section (221) is connected to the metal part (21); the first bending section (222) is connected to a side of the first extension section (221) away from the metal part (21); at least a portion of the first extension section (221) is in contact with the first side wall (1111); at least a portion of the first bending section (222) is in contact with the top cover sheet (112), and an end portion of the first bending section (222) is arranged toward the pole (1121).

4. The battery pack according to claim 3, characterized in that: The side plate (2) further comprises: A second plastic part (23), the second plastic part (23) being connected to a side of the metal part (21) away from the first plastic part (22) in the second direction (Y); the second plastic part (23) extending along the first direction (X), and at least a portion of the second plastic part (23) being in contact with the housing (111) of the plurality of batteries (11).

5. The battery pack according to claim 4, characterized in that: The second plastic part (23) comprises a second extension section (231), and the second extension section (231) is connected to the metal part (21); at least a part of the second extension section (231) is in contact with the first side wall (1111).

6. The battery pack according to claim 2, characterized in that: Also includes: end plates (3), the end plates (3) being located at two opposite ends of the battery pack (1) along the first direction (X) and connected to the second side wall (1112); A bending portion (4), the bending portion (4) being located at two opposite ends of the metal portion (21) along the first direction (X) and connected to the metal portion (21), and at least a portion of the bending portion (4) being connected to the end plate (3).

7. The battery pack according to claim 2, characterized in that: The metal part (21) has a maximum dimension H1 mm in the second direction (Y), and the first side wall (1111) has a maximum dimension H2 mm in the second direction (Y), satisfying: 0.10≤H1 / H2≤0.

95.

8. The battery pack according to claim 5, characterized in that: The metal part (21) comprises: A first body (211), the first body (211) comprising a first end (2111) and a second end (2112) opposite to each other along the second direction (Y): a first thinning portion (212), the first thinning portion (212) being disposed at the first end (2111), the first thinning portion (212) having a plurality of first through holes (2121), the first extending section (221) covering the first thinning portion (212), and a portion of the first extending section (221) filling the first through holes (2121); A second thinning portion (213), wherein the second thinning portion (213) is disposed at the second end (2112), the second thinning portion (213) has a plurality of second through holes (2131), the second extension section (231) covers the second thinning portion (213), and a portion of the second extension section (231) fills the second through holes (2131).

9. The battery pack according to claim 5, characterized in that: The metal part (21) comprises: A first body (211), the first body (211) comprising a first end (2111) and a second end (2112) opposite to each other along the second direction (Y): a first convex portion (214), wherein the first convex portion (214) is disposed at the first end (2111), the first extension section (221) has a first concave portion (2211), and the first convex portion (214) is penetrated through the first concave portion (2211) and connected to an inner wall of the first concave portion (2211); A second convex portion (215), wherein the second convex portion (215) is disposed at the second end (2112), the second extension section (231) has a second concave portion (2311), and the second convex portion (215) is penetrated through the second concave portion (2311) and connected to the inner wall of the second concave portion (2311).

10. The battery pack according to claim 3, characterized in that: The first extension section (221) comprises a second body (2212) and a transition section (2213), and the transition section (2213) is respectively connected to the second body (2212) and the metal part (21).

11. The battery pack according to claim 10, characterized in that: One side surface of the transition section (2213) is a curved surface.

12. The battery pack according to claim 2, characterized in that: Also includes: A bonding portion (5), wherein the bonding portion (5) is located between the metal portion (21) and the first side wall (1111), and respectively connects the metal portion (21) and the first side wall (1111).

13. An electrical device, characterized in that: A battery pack comprising any one of claims 1-12.

Images