Battery pack

Abstract

A battery pack, comprising an upper cover assembly (100), wherein the upper cover assembly (100) comprises: a first cover body (110), one end of the first cover body in a first direction (Y) being provided with a first connecting piece (114); a second cover body (120), one end of the second cover body in the first direction (Y) being provided with a second connecting piece (123), and the first connecting piece (114) being stacked above the second connecting piece (123) or the second connecting piece (123) being stacked above the first connecting piece (114); and a fixing member (130), the fixing member being configured to fix the first connecting piece (114) and the second connecting piece (123).

Description

battery pack

[0001] Citation of Related Applications

[0002] This application claims priority to the Chinese patent application with application number 202321635795.4 and application name “Battery Pack” filed with the State Intellectual Property Office of the People’s Republic of China on June 26, 2023, and incorporates its entire contents into this application by reference.

[0003] field

[0004] The present application relates generally to the field of battery technology, and more particularly to battery packs.

[0005] background

[0006] With the rapid development of new energy vehicles, the automotive industry has increasingly stringent requirements for the safety and stability of battery casings. Battery casings are not only part of the battery pack but also involve body systems and electrical safety, making them key components of new energy vehicles. As the carrier of the battery module, insufficient strength of the power battery system casing (battery casing) not only fails to ensure the stable operation and safety protection of the battery module, but also poses a threat to the strength, rigidity, and crash safety of the entire vehicle. Therefore, strengthening the strength design of the battery casing is of great significance to both the battery pack and the entire vehicle.

[0007] In the battery pack structure, the top cover protects the internal components. As a structural component, the top cover needs to withstand stress. In related art, the top cover of the battery pack is designed and formed in an integrated manner. However, mechanical simulations of this integrated top cover revealed that the structural strength of the top cover is insufficient, the structure is complex, and manufacturability is low.

[0008] Overview

[0009] In one aspect, the present application provides a battery pack, comprising an upper cover assembly, wherein the upper cover assembly comprises:

[0010] A first cover body, having a first connecting piece at one end thereof along a first direction;

[0011] a second cover having a second connecting piece at one end thereof along the first direction, wherein the first connecting piece is stacked on top of the second connecting piece or the second connecting piece is stacked on top of the first connecting piece; and

[0012] A fixing member is used to fix the first connecting piece and the second connecting piece.

[0013] In some embodiments, the fixing member is a bolt, and both the first connecting plate and the second connecting plate are provided with fixing holes. The fixing holes on the first connecting plate are arranged opposite to the fixing holes on the second connecting plate, and the bolt passes through the fixing holes to fasten the first connecting plate and the second connecting plate.

[0014] In certain embodiments, along the first direction, the size of the second cover is L2, and the size of the first cover is L1, satisfying: 0.15≤L2 / L1≤0.3.

[0015] In certain embodiments, along the first direction, the size of the first connecting piece is L3, and the size of the first cover is L1, satisfying: 0.02≤L3 / L1≤0.05.

[0016] In certain embodiments, the first connecting piece and the second connecting piece are the same size.

[0017] In certain embodiments, the second cover body includes a bottom plate and a third side wall, the third side wall is located at one end of the bottom plate along the first direction, and the angle between the edge of the second connecting piece facing the first cover body and the third side wall is α, satisfying: α≤10°.

[0018] In certain embodiments, a through hole is formed on the third sidewall.

[0019] In certain embodiments, a sealing member is provided between the first connecting piece and the second connecting piece, and both the first connecting piece and the second connecting piece are connected to the sealing member.

[0020] In certain embodiments, the first cover body includes a first side wall, a top plate, and a second side wall connected in sequence along a second direction, the angle between the first side wall and the top plate is an obtuse angle, and the angle between the second side wall and the top plate is an obtuse angle; the second direction intersects with the first direction and is parallel to the top plate.

[0021] In certain embodiments, the battery pack of the present application further comprises:

[0022] A box body, wherein the upper cover assembly is buckled on the opening of the box body to enclose and form a receiving space; and

[0023] The battery is arranged in the accommodating space.

[0024] In some embodiments, the upper cover assembly is divided into two parts, a first cover body and a second cover body, which are connected together by fixing parts. The first connecting piece is stacked on top of the second connecting piece or the second connecting piece is stacked on top of the first connecting piece, so that the first connecting piece of the first cover body and the second connecting piece of the second cover body form a double-layer structure. After being connected by fixing parts, the structural strength of the upper cover assembly can be greatly enhanced.

[0025] BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] 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. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] FIG1 shows a perspective view of an upper cover assembly provided in one embodiment of the present application;

[0029] FIG2 shows an assembly diagram of an upper cover assembly provided in an embodiment of the present application;

[0030] FIG3 shows a perspective view of the first cover body in the upper cover assembly provided in one embodiment of the present application;

[0031] FIG4 shows a side view of the first cover body in the upper cover assembly provided in one embodiment of the present application;

[0032] FIG5 shows a perspective view of the second cover body in the upper cover assembly provided in one embodiment of the present application;

[0033] FIG6 shows a perspective view of a battery pack provided in one embodiment of the present application;

[0034] FIG7 shows a perspective view of a box in a battery pack provided in an embodiment of the present application;

[0035] FIG8 is a schematic diagram of an X-axis simulation analysis of an integrated battery pack cover;

[0036] FIG9 is a schematic diagram of a Y-axis simulation analysis of an integrated battery pack cover;

[0037] FIG10 is a schematic diagram of an X-axis simulation analysis of an upper cover assembly provided in one embodiment of the present application; and

[0038] FIG11 is a schematic diagram of the Y-axis simulation analysis of the upper cover assembly provided in the first embodiment of the application.

[0039] Reference Signs: 100, upper cover assembly; 110, first cover; 111, first sidewall; 112, top plate; 113, second sidewall; 114, first connecting piece; 115, recessed portion; 1151, first recessed portion; 1152, second recessed portion; 1153, third recessed portion; 120, second cover; 121, bottom plate; 122, third sidewall; 123, second connecting piece; 124, through-hole; 130, fixing member; 140, fixing hole; 150, first flange; 200, housing; 210, second flange. X, first direction; Y, second direction.

[0040] Details

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] As shown in Figures 1 to 5, a battery pack provided in one embodiment of the present application includes a top cover assembly 100, which includes a first cover body 110, a second cover body 120, and a fixing member 130. The first cover body 110 has a first connecting piece 114 at one end along the first direction Y; the second cover body 120 has a second connecting piece 123 at one end along the first direction Y, with the first connecting piece 114 stacked on top of the second connecting piece 123, or the second connecting piece 123 stacked on top of the first connecting piece 114; the fixing member 130 is used to fix the first connecting piece 114 and the second connecting piece 123. In the battery pack provided in this embodiment, the upper cover assembly is divided into two parts, a first cover body 110 and a second cover body 120, which are then connected together by a fixing member. The first connecting piece 114 is stacked on top of the second connecting piece 123 or the second connecting piece 123 is stacked on top of the first connecting piece 114, so that the first connecting piece 114 of the first cover body 110 and the second connecting piece 123 of the second cover body 120 form a double-layer structure. After being connected by the fixing member 130, the structural strength of the upper cover assembly 100 can be greatly enhanced.

[0043] In certain embodiments, the specific form of the fixing member 130 includes, but is not limited to, a clip, a rivet, and a bolt. Considering both ease of disassembly and secure connection, the fixing member 130 is a bolt. Fixing holes 140 can be defined in both the first connecting piece 114 and the second connecting piece 123. The fixing holes 140 on the first connecting piece 114 are aligned with the fixing holes 140 on the second connecting piece 123. The bolts penetrate the fixing holes 140 to secure the first connecting piece 114 and the second connecting piece 123.

[0044] In order to assist in a more in-depth explanation of the technical effects of the upper cover assembly 100 in the battery pack of the embodiment of the present application, a specific structure of the upper cover assembly 100 is given as an example below. It should be noted that the specific structural description of the first cover body 110 and the second cover body 120 in the upper cover assembly 100 is only a schematic example. Those skilled in the art can design the specific results of the first cover body 110 and the second cover body 120 into other forms as needed.

[0045] As shown in Figures 1 to 4, the first cover 110 includes a first side wall 111, a top plate 112, and a second side wall 113 connected in sequence along a second direction X. A first connecting piece 114 is provided at one end of the first cover 110 along the first direction Y. The second direction X intersects with the first direction Y and is parallel to the top plate 112. The second direction X and the first direction Y may be orthogonal. As shown in Figures 1, 2, and 5, the second cover 120 includes a bottom plate 121, a third side wall 122, and a second connecting piece 123. The bottom plate 121 is parallel to the top plate 112. The third side wall 122 is located at one end of the bottom plate 121 along the first direction Y. The first connecting piece 114 and the second connecting piece 123 are stacked. The fixing member 130 is used to fix the stacked first connecting piece 114 and the second connecting piece 123. The upper cover assembly 100 is no longer a one-piece structure, but is divided into two parts: a first cover body 110 and a second cover body 120. The first cover body 110 and the second cover body 120 are then connected together by a fixing member 130. The first cover body 110 includes a first side wall 111, a top plate 112, and a second side wall 113. Its structure is similar to the N-shaped or arched structure shown in Figure 4. The third side wall 122 of the second cover body 120 is used to block one end of the arched structure of the first cover body 110.

[0046] The second cover 120 is more complex in structure than the first cover 110, and its purpose is to adaptably meet the necessary functions of the battery pack. In certain embodiments, as shown in FIG5 , a through hole 124 is provided on the third side wall 122, and the through hole 124 can be used to allow the relevant structures in the battery pack to pass through the upper cover assembly 100, and the through hole 124 can be used to allow the high-voltage connector of the battery pack to pass through. Of course, the through hole 124 can also be used for other purposes, and those skilled in the art can set it according to the specific needs of the battery pack structure design. Setting structures such as high-voltage connectors or wiring harnesses through the third side wall 122, especially after the through hole 124 is opened, will further increase the complexity of the structure of the second cover 120 and make it more likely to cause stress concentration. In the embodiment of the present application, the size ratio of the second cover 120 is minimized while meeting the functional requirements of the battery pack.

[0047] In certain embodiments, along the first direction Y, the dimension of the second cover 120 is L2, and the dimension of the first cover 110 is L1, satisfying the following: 0.15 ≤ L2 / L1 ≤ 0.3, where the dimension L2 of the second cover 120 is defined as the length of the second cover 120 along the Y direction at the centerline of the second cover 120 in the X direction, and the dimension L1 of the first cover 110 is defined as the length of the first cover 110 along the Y direction at the centerline of the first cover 110 in the X direction. In certain embodiments, along the first direction Y, the dimension of the first connecting tab 114 is L3, and the dimension of the first cover 110 is L1, satisfying the following: 0.02 ≤ L3 / L1 ≤ 0.05. In certain embodiments, the first connecting tab 114 and the second connecting tab 123 are the same size. This proportional distribution of the dimensions of the first connecting tab 114 enables the battery pack to provide more stable connection performance while minimizing the size ratio of the first connecting tab 114 to the second connecting tab 123, thereby improving battery safety and reliability.

[0048] After adopting the upper cover assembly 100 of the above-described embodiment of the present application, the top plate 112, first side wall 111, and second side wall 113 of the first cover body 110 form an n-shaped or arched structure with a relatively simple and regular shape. The top plate 112, first side wall 111, and second side wall 113 are manufactured together, which can greatly reduce stress concentration. Moreover, after the first cover body 110 and the second cover body 120 are connected by the fixing member 130, the first connecting piece 114 of the first cover body 110 and the second connecting piece 123 of the second cover body 120 form a double-layer structure, which can greatly enhance the structural strength of the upper cover assembly 100. By dividing the upper cover assembly 100 into the first cover body 110 and the second cover body 120, the first cover body 110 and the second cover body 120 have different levels of structural complexity, thereby simplifying the process flow, reducing the manufacturing cost of the entire product, and improving the manufacturability of the product.

[0049] In certain embodiments, the second cover 120 includes a bottom plate 121 and a third side wall 122, the third side wall 122 being located at one end of the bottom plate 121 along the first direction Y, and the angle between the edge of the second connecting piece 123 facing the first cover 110 and the third side wall 122 is α, satisfying α≤10°. In certain embodiments, the edge of the second connecting piece 123 facing the first cover 110 is parallel to the third side wall 122. In certain embodiments, the edge of the second connecting piece 123 facing the first cover 110 is parallel or approximately parallel to the third side wall 122, so that the distance between the edge of the second connecting piece 123 facing the first cover 110 and the third side wall 122 does not change significantly, maintaining a certain uniformity, and forming a plate structure with uniform width between the edge of the second connecting piece 123 facing the first cover 110 and the third side wall 122, which can avoid excessive stress concentration. Since the first connecting piece 114 and the second connecting piece 123 have the same size and are stacked, the angle between the edge of the first connecting piece 114 facing the second cover 110 and the third side wall 122 should also be the same as α, which is not repeated here.

[0050] In certain embodiments, a sealant is disposed between the first connecting sheet 114 and the second connecting sheet 123, and both the first connecting sheet 114 and the second connecting sheet 123 are connected to the sealant. The sealant is used to close the gap between the first connecting sheet 114 and the second connecting sheet 123, thereby creating a closed internal space within the battery pack and preventing liquid or gas leakage, thereby achieving a sealing effect. Specific materials for the sealant include, but are not limited to, foam, silicone, and rubber.

[0051] In certain embodiments, the angle between the first side wall 111 and the top plate 112, the angle between the second side wall 113 and the top plate 112, and the angle between the third side wall 122 and the bottom plate 121 can be selected as needed, and this application does not impose specific limitations. In certain embodiments, the angle between the first side wall 111 and the top plate 112 can be an obtuse angle or a right angle, the angle between the second side wall 113 and the top plate 112 can be an obtuse angle or a right angle, and the angle between the third side wall 122 and the bottom plate 121 can be an acute angle, a right angle, or an obtuse angle. In some embodiments, the angle between the first side wall 111 and the top plate 112 is an obtuse angle, and the angle between the second side wall 113 and the top plate 112 is an obtuse angle, so that when gradually moving away from the top plate 112, the distance between the first side wall 111 and the second side wall 113 of the first cover body 110 gradually increases, so that the interface of the first cover body 110 forms a trumpet shape, and the first connecting piece 114 follows the top plate 112, the first side wall 111 and the second side wall 113, and also forms a trumpet shape. The trumpet-shaped structural design allows the first connecting piece 114 and the second connecting piece 123 to be directly fastened together in the stacking direction to form a laminated structure, which can realize the rapid assembly of the first cover body 110 and the second cover body 120.

[0052] In certain embodiments, as shown in Figures 1 to 5, the edges of the first cover 110 and the second cover 120 are each provided with a first flange 150. The first flange 150 is provided around the upper cover assembly 100 and is provided coplanarly with the bottom plate 121. The first flange 150 is configured to connect to the battery pack case 200. The provision of the first flange 150 facilitates the installation of the battery pack upper cover assembly 100 and the case 200, making assembly and disassembly more convenient. In certain embodiments, the first flange 150 is provided with a fixing hole 140, into which a fixing member 130, such as a bolt, is inserted to achieve a fixed connection between the battery pack upper cover assembly 100 and the case 200.

[0053] In certain embodiments, as shown in FIG2 , the ends of the first connecting piece 114 are respectively stacked with the first flange 150 on the second cover 120. That is, the ends of the first connecting piece 114 extend further toward the sides until they overlap with the first flange 150 on the second cover 120. This further increases the contact area between the first cover 110 and the second cover 120, thereby enhancing the connection strength. In certain embodiments, the first connecting piece 114 is located above the second connecting piece 123; in some embodiments, the second connecting piece 123 is located above the first connecting piece 114. In the drawings of this application, the first connecting piece 114 is located above the second connecting piece 123 as an example for illustration.

[0054] In some embodiments, the first cover 110 and the second cover 120 are both integrally formed. In some embodiments, in the upper cover assembly 100, the top plate 112, the first side wall 111, the second side wall 113, the first connecting piece 114, and the first flange 150 of the first cover 110 are integrally formed, and the bottom plate 121, the third side wall 122, the second connecting piece 123, and the first flange 150 of the second cover 120 are integrally formed. All of these can be formed by stamping, which is convenient to manufacture and has low production costs, greatly improving the structural strength of the upper cover assembly 100.

[0055] In certain embodiments, the upper cover assembly 100 also employs an optimized arc transition connection scheme, such as an arc transition connection between the top plate 112 and the first side wall 111, an arc transition connection between the top plate 112 and the second side wall 113, an arc transition connection between the first flange 150 and the first side wall 111, and an arc transition connection between the first flange 150 and the third side wall 122. This can reduce stress concentration, further improve the structural strength of the upper cover assembly 100, reduce modal conditions, and minimize deformation during vibration. When the upper cover assembly 100 is used in a battery pack, it can prevent the upper cover assembly 100 from forming pressure contact with the upper surface of the internal battery module or the aluminum bar, which could cause insulation failure, thereby improving the safety and reliability of the battery module.

[0056] In certain embodiments, as shown in Figures 2 and 3, the surface of the first cover 110 is provided with a plurality of recessed portions 115, which helps to improve the structural strength of the first cover 110, thereby improving the structural reliability of the upper cover assembly 100. The recessed portions 115 can be formed by stamping, which can be quickly formed on the first cover 110, is simple to process, and has high structural strength. At the same time, this method is more material-efficient than the method of protruding reinforcing ribs on the surface of the first cover plate, does not increase the weight of the first cover plate, and is conducive to improving the structural strength while facilitating the lightweight design of the upper cover assembly 100.

[0057] In some embodiments, the recessed portions 115 may be regularly or irregularly arranged on the first cover 110 , such as being arranged in parallel or crosswise arrangement, or arranged to form any other pattern, which is not specifically limited here. In certain embodiments, as shown in Figure 3, the recessed portion 115 may include a first recessed portion 1151, a second recessed portion 1152 and a third recessed portion 1153. The first recessed portion 1151, the second recessed portion 1152 and the third recessed portion 1153 are all extended in a long strip shape, and the extension direction is perpendicular to the first direction Y and along the surface of the first cover body 110; the first recessed portion 1151 starts from the connection between the first side wall 111 and the first flange 150, passes through the entire first side wall 111 and ends at the top plate 112, the second recessed portion 1152 starts from the connection between the second side wall 113 and the first flange 150, passes through the entire second side wall 113 and ends at the top plate 112, the third recessed portion 1153 is located on the top plate 112 and its two ends extend to the first side wall 111 and the second side wall 113 respectively, and the recessed portions 115 are evenly spaced along the first direction Y. In certain embodiments, a group of first recessed portions 1151 and second recessed portions 1152 is disposed between two adjacent third recessed portions 1153 .

[0058] In order to verify the structural strength of the upper cover assembly 100 provided in the embodiment of the present application, finite element model simulation analysis was performed on the structure before and after improvement respectively. The material of the structural parts was selected as GMY. During the simulation process, the structural parts were fixed on the platform, and random vibration conditions were applied to the platform for structural verification.

[0059] Figures 8 and 9 are schematic diagrams of the simulation analysis results for the battery pack cover with an integrated structure. It can be seen from the figure that the battery pack with an integrated structure has two failure points at the connection between the first cover and the second cover, that is, the maximum stress at the two points reached 141.84 MPa and 46.53 MPa respectively, both of which are much higher than the evaluated strength of 33.3 MPa.

[0060] Figure 10 is a simulation analysis result diagram of the X-direction stress of the upper cover assembly 100 proposed in this embodiment. The simulation results show that compared with the results of Figures 8 and 9, the failure phenomenon in the structure disappears, and the maximum stress in the X-direction is only 1.16 MPa. Figure 11 is a simulation analysis result diagram of the Y-direction stress of the upper cover assembly 100 proposed in this embodiment. The simulation results show that compared with the results of Figures 8 and 9, the failure phenomenon in the structure disappears, and the maximum stress in the Y-direction is only 0.06 MPa. In addition, the technicians also conducted a simulation analysis of the Z-direction stress of the upper cover assembly 100, and the maximum stress in the Z-direction was only 0.62 MPa. The simulation results show that the entire upper cover assembly 100 has no failure areas, and fully meets the structural strength requirements under relatively harsh working conditions.

[0061] As shown in Figures 6 and 7, a battery pack provided in one embodiment of the present application includes a housing 200, a top cover assembly 100, and a battery module. The specific description of the top cover assembly 100 is referenced in the above embodiments of the present application and will not be repeated here. The top cover assembly 100 snaps onto the opening of the housing 200 to enclose a storage space, within which the battery is disposed.

[0062] In certain embodiments, the upper cover assembly 100 is surrounded by a first flange 150, and the opening side of the box body 200 is surrounded by a second flange 210. The first flange 150 and the second flange 210 are stacked, and fixing holes 140 are provided on the first flange 150 and the second flange 210. Bolts and other fixing parts pass through the fixing holes 140 to fasten the first flange 150 and the second flange 210, thereby achieving a fixed connection between the upper cover assembly 100 and the box body 200.

[0063] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0065] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "example," "specific example," or "certain examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A battery pack, comprising an upper cover assembly, wherein the upper cover assembly comprises: A first cover body, having a first connecting piece at one end thereof along a first direction; A second cover body, having a second connecting piece at one end along the first direction, wherein the first connecting piece is stacked on top of the second connecting piece or the second connecting piece is stacked on top of the first connecting piece; as well as A fixing member is configured to fix the first connecting piece and the second connecting piece.

2. The battery pack as claimed in claim 1, wherein the fixing member is a bolt, the first connecting plate and the second connecting plate are both provided with fixing holes, the fixing hole on the first connecting plate is arranged opposite to the fixing hole on the second connecting plate, and the bolt passes through the fixing hole to fasten the first connecting plate and the second connecting plate. 3 . The battery pack according to claim 1 , wherein along the first direction, a size of the second cover is L2, a size of the first cover is L1, and the following condition is satisfied: 0.15≤L2 / L1≤0.

3. 4 . The battery pack according to claim 1 , wherein along the first direction, a size of the first connecting piece is L3, a size of the first cover is L1, and the following condition is satisfied: 0.02≤L3 / L1≤0.

05. The battery pack as claimed in claim 1 , wherein the first connecting piece and the second connecting piece have the same size.

6. The battery pack as claimed in claim 1, wherein the second cover body comprises a bottom plate and a third side wall, the third side wall is located at one end of the bottom plate along the first direction, and the angle between the edge of the second connecting piece facing the first cover body and the third side wall is α, satisfying: α≤10°. 7 . The battery pack as claimed in claim 6 , wherein a through hole is formed on the third side wall. 8 . The battery pack as claimed in claim 1 , wherein a sealing member is disposed between the first connecting sheet and the second connecting sheet, and the first connecting sheet and the second connecting sheet are both connected to the sealing member.

9. The battery pack as claimed in claim 1, wherein the first cover body comprises a first side wall, a top plate, and a second side wall connected in sequence along a second direction, the angle between the first side wall and the top plate is an obtuse angle, and the angle between the second side wall and the top plate is an obtuse angle; the second direction intersects with the first direction and is parallel to the top plate.

10. The battery pack according to claim 1, further comprising: The box body, the upper cover assembly is buckled on the opening of the box body to enclose and form a containing space; as well as The battery is arranged in the accommodating space.

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