Top cover assembly, battery and electric equipment

Abstract

The invention provides a top cover assembly, a battery and electric equipment. Comprising a top cover and lower plastic. The top cover is provided with at least one hot melting hole which comprises a first hot melting hole; the lower plastic comprises a lower plastic body and at least one hot melting column which are connected, the lower plastic body and the top cover are stacked, the at least one hot melting column protrudes relative to the lower plastic body, the at least one hot melting column is fixedly connected with the hot melting hole through a hot melting technology so that the lower plastic body can be attached to the top cover, and the at least one hot melting column comprises a first hot melting column; the first hot melting column is located in the first hot melting hole; the top cover assembly further comprises a connecting piece, the connecting piece is located on the side, away from the top cover, of the lower plastic, the connecting piece is used for being connected with a tab of the electrode assembly in a welded mode, and in the thickness direction of the top cover assembly, the projection of the first hot melting column on the lower plastic body falls within the projection range of the connecting piece on the lower plastic body. According to the technical scheme, the lower plastic and the top cover can be well attached.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a top cover assembly, a battery and an electrical device. Background Art

[0002] With the development of clean energy, batteries with recyclable characteristics are becoming more and more popular. The battery includes an electrode assembly, a shell and a top cover assembly. The electrode assembly is located in a receiving space formed by the shell and the top cover assembly. The top cover assembly includes a top cover, a lower plastic and an explosion-proof valve, and the top cover and the lower plastic are stacked. However, due to the low strength and easy deformation of the lower plastic, the lower plastic and the top cover cannot fit well. Summary of the invention

[0003] The embodiments of the present application provide a top cover assembly, a battery and an electrical device, which can achieve a better fit between the lower plastic and the top cover.

[0004] In a first aspect, the present application provides a top cover assembly, the top cover assembly comprising a top cover and a lower plastic; The top cover comprises a first surface, the top cover is provided with at least one hot melt hole, the opening of the at least one hot melt hole is located on the first surface, and the at least one hot melt hole comprises a first hot melt hole; The lower plastic includes a lower plastic body and at least one hot melt column, the lower plastic body and the top cover are stacked, the lower plastic body includes a second surface, the second surface is arranged opposite to the first surface, the at least one hot melt column is connected to the lower plastic body and is protruded relative to the second surface, the at least one hot melt column is fixedly connected to the at least one hot melt hole through a hot melt process, so that the lower plastic body and the top cover are fitted, the at least one hot melt column includes a first hot melt column, and the first hot melt column is located in the first hot melt hole; The top cover assembly also includes a connecting piece, which is located on the side of the lower plastic away from the top cover, and is used for welding to the pole ear of the electrode assembly. In the thickness direction of the top cover assembly, the projection of the first hot melt column on the lower plastic body falls within the projection range of the connecting piece on the lower plastic body.

[0005] It can be understood that by arranging a hot melt column on the lower plastic and a hot melt hole on the top cover, and fixing the hot melt column and the hot melt hole through a hot melt process, when the hot melt column is deformed by hot melt through the hot melt process, it can be tightly fitted together with the hole wall of the hot melt hole of the top cover, thereby increasing the connection stability and reliability between the hot melt column and the hot melt hole, so that the lower plastic body and the top cover can also be fitted together more closely, thereby enhancing the connection strength between the lower plastic and the top cover, and realizing a fixed connection between the lower plastic and the top cover.

[0006] Since the connecting piece needs to be connected to the pole column and welded to the tab of the electrode assembly to form an electrical connection path between the pole column and the tab of the electrode assembly. However, this welding process will cause the temperature in the area where the connecting piece is located to be too high during welding, which easily leads to the lower plastic being heated and deformed. Therefore, in order to prevent the lower plastic from bending and deforming due to excessive welding heat during the welding process, and to make the first heat-melting column covered by the projection of the connecting piece on the lower plastic in the thickness direction of the top cover assembly, the first heat-melting column can be arranged in the area where the lower plastic is prone to heat-induced deformation, thereby effectively strengthening the connection strength between the lower plastic and the top cover, and avoiding the problems of the lower plastic collapsing and the top cover assembly failing due to the heat-induced deformation of the lower plastic.

[0007] In a possible implementation manner, the at least one heat-melting hole further includes a second heat-melting hole, and the at least one heat-melting column further includes a second heat-melting column, and the second heat-melting column is located in the second heat-melting hole; The lower plastic further includes a central boss, the central boss is connected to the lower plastic body and protrudes relative to the surface of the lower plastic body facing away from the top cover. In the thickness direction of the lower plastic, the projection of the second heat-melting column on the lower plastic body is adjacent to the projection of the central boss on the lower plastic body and is spaced in the length direction of the lower plastic.

[0008] In a possible implementation manner, the at least one heat-melting hole further includes a third heat-melting hole, and the at least one heat-melting column further includes a third heat-melting column, and the third heat-melting column is located in the third heat-melting hole; The lower plastic further includes an edge boss, the edge boss is connected to the lower plastic body and protrudes relative to the surface of the lower plastic body facing away from the top cover. The edge boss is located at the end of the lower plastic body in the length direction. In the thickness direction of the lower plastic, the projection of the third heat-melting column on the lower plastic body falls within the projection range of the edge boss on the lower plastic body.

[0009] In a possible implementation manner, each of the heat-melting holes includes a first sub-hole, a second sub-hole, and a third sub-hole. The opening of the first sub-hole is located on the first surface, and the first sub-hole, the second sub-hole, and the third sub-hole are sequentially connected and coaxially arranged in the thickness direction of the lower plastic; The dimension of the first sub-hole in the length direction of the top cover is smaller than the dimension of the third sub-hole in the length direction of the top cover, and the dimension of the second sub-hole in the length direction of the top cover gradually increases from the direction of the first sub-hole to the direction of the third sub-hole; Each of the heat-melting columns is filled in the first sub-hole, the second sub-hole, and the third sub-hole.

[0010] In a possible implementation, the top cover is further provided with a glue storage groove, the opening of the glue storage groove is located on the first surface, the glue storage groove is disposed around the periphery of the first sub-hole and communicates with the first sub-hole, and the depth of the glue storage groove is less than the depth of the first sub-hole.

[0011] In a possible implementation, the top cover is provided with an explosion-proof hole, and the explosion-proof hole penetrates through the top cover along the thickness direction of the top cover; In the thickness direction of the top cover assembly, the projection of the central boss on the lower plastic body overlaps partially with the projection of the explosion-proof hole on the lower plastic body.

[0012] In a possible implementation, the top cover is provided with a positioning hole, the opening of the positioning hole is located on the first surface, and in the length direction of the top cover, the positioning hole is disposed between the first hot melt hole and the third hot melt hole and arranged in sequence; The lower plastic also includes a positioning post, and the positioning post is inserted into the positioning hole.

[0013] In a possible implementation, the top cover is provided with a first pole hole, and the first pole hole penetrates through the top cover along the thickness direction of the top cover; In the width direction of the top cover, the distance between the central axis of the second hot melt hole and the central axis of the first pole hole is different from the distance between the central axis of the positioning hole and the central axis of the first pole hole.

[0014] In a possible implementation, the top cover is provided with a first pole hole, and the first pole hole penetrates through the top cover along the thickness direction of the top cover; In the width direction of the top cover, the distance between the central axis of the first hot melt hole and the central axis of the first pole hole is different from the distance between the central axis of the positioning hole and the central axis of the first pole hole.

[0015] In a possible implementation, the top cover is provided with a first pole hole, and the first pole hole penetrates through the top cover along the thickness direction of the top cover; The third hot melt hole is located at the end of the length direction of the top cover, and in the width direction of the top cover, the distance between the central axis of the third hot melt hole and the central axis of the first pole hole is different from the distance between the central axis of the positioning hole and the central axis of the first pole hole.

[0016] In a possible embodiment, the top cover also includes a third surface, the third surface and the first surface are arranged opposite to each other in the thickness direction of the top cover, the top cover is recessed from the first surface toward the third surface to form an extension portion, the extension portion is arranged around the outer edge of the top cover, and the extension portion is used to be welded to the shell.

[0017] In a second aspect, the present application also provides a battery, comprising an electrode assembly, a shell and a top cover assembly as described above, wherein the top cover assembly is connected to the shell and is arranged together with the shell to form a receiving space, and the electrode assembly is located in the receiving space.

[0018] In a possible implementation, the electrode assembly includes a battery cell, the battery cell includes two first side surfaces and two second side surfaces, the two first side surfaces are arranged opposite to each other along a width direction of the battery, the two second side surfaces are arranged opposite to each other along a length direction of the battery, each of the first side surfaces is connected between the two second side surfaces, and an area of ​​the first side surface is greater than an area of ​​the second side surface; The housing comprises two first side portions, the two first side portions are arranged opposite to each other and spaced apart along the width direction of the battery, and each of the first side portions is arranged opposite to one of the first side surfaces along the width direction of the battery; The first side portion includes a main body portion and a welding portion, the welding portion is connected to one side of the main body portion along the height direction of the battery, the end of the welding portion away from the main body portion is welded to the top cover, the thickness of the welding portion is greater than the thickness of the main body portion, and in the width direction of the shell, the welding portion and the projection of the battery cell on the first side portion are spaced apart.

[0019] In a possible implementation manner, the first side portion further includes a transition portion, wherein the transition portion is connected between the welding portion and the main body portion, and a thickness of the transition portion gradually increases from the main body portion toward the welding portion.

[0020] In a third aspect, the present application also provides an electrical device, wherein the electrical device comprises the battery as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application; Figure 2 is a structural schematic diagram of a battery provided in an embodiment of the present application; Figure 3a is along Figure 2 A schematic diagram of a partial structure of a battery obtained by cutting along the cutting line AA shown; Figure 3b yes Figure 2A schematic diagram of a partial structure of a battery housing shown; Figure 4 yes Figure 3a The enlarged structural diagram of the S region is shown; Figure 5 is a schematic structural diagram of a top cover assembly provided in an embodiment of the present application; Figure 6 yes Figure 5 An exploded structural diagram of the top cover assembly shown; Figure 7 yes Figure 5 A schematic structural diagram of an angle of a top cover of the top cover assembly shown; Figure 8 yes Figure 5 A schematic structural diagram of the top cover of the top cover assembly shown in FIG. 1 from another angle; Figure 9 yes Figure 5 A schematic structural diagram of a top cover of the top cover assembly shown in FIG. 1 from another angle; Figure 10 is along Figure 8 A schematic cross-sectional view of a partial structure of a top cover obtained by cutting along the cutting line BB shown; Figure 11 is along Figure 8 A schematic cross-sectional view of another partial structure of the top cover obtained by cutting along the cutting line BB shown; Figure 12 is along Figure 8 A schematic cross-sectional view of a partial structure of a top cover obtained by cutting along the cutting line CC shown; Figure 13 is along Figure 5 A schematic cross-sectional view of a partial structure of a top cover assembly obtained by cutting along the cutting line EE shown; Figure 14 yes Figure 5 A schematic structural diagram of the lower plastic of the top cover assembly at an angle shown; Figure 15 is along Figure 5 A schematic cross-sectional view of a partial structure of a top cover assembly obtained by cutting along the cutting line FF shown; Figure 16 is along Figure 5 A schematic cross-sectional view of another partial structure of the top cover assembly obtained by cutting along the cutting line FF shown; Figure 17 is along Figure 5 The cross-sectional schematic diagram of another partial structure of the top cover assembly obtained by cutting along the cutting line GG shown.

[0022] Reference numerals: Energy storage system 400, power conversion device 410, first user load 420, second user load 430, electrical equipment 300, battery 200, top cover assembly 100, housing 210, electrode assembly 220, first side portion 2110, second side portion 2120, main body portion 2130, welding portion 2140, transition portion 2150, top cover 10, upper plastic 20, lower plastic 30, terminal post 40, connecting piece 51, sealing ring 52, pressing ring 53, limiting body 54, support member 60, heat insulation sheet 70, explosion-proof valve assembly 80, first surface 101, third surface 102, first terminal post hole 11, explosion-proof hole 12, mounting table 103, groove 104, positioning hole 13, hot melt hole Q, second hot melt hole 14, first sub-hole Q1, second sub-hole Q2, third sub-hole Q3, glue-containing groove 15, first hot melt hole 16, third hot melt hole 18, extension portion 106, explosion-proof valve 81, explosion-proof valve protection sheet 82, lower plastic body 31, positioning post 32, second surface 311, fourth surface 312, second terminal post hole 33, central boss 34, edge boss 35, hot melt post T, second hot melt post 36, first hot melt post 37, third hot melt post 38. Detailed implementation manners

[0023] For the convenience of understanding, first, the terms involved in the embodiments of the present application are explained.

[0024] And / or: It is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0025] Multiple: It means two or more than two.

[0026] Connection: It should be understood in a broad sense. For example, when A is connected to B, it can be that A is directly connected to B, or A is indirectly connected to B through an intermediate medium.

[0027] Next, the specific implementation manners of the present application will be clearly described with reference to the accompanying drawings.

[0028] The embodiments of the present application provide a top cover assembly, a battery, and electrical equipment.

[0029] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the energy utilization rate, it is necessary to store one form of energy in the same or converted into another form of energy through a medium or device, and then release it in a specific energy form based on future application needs. As is well known, the current generation of green electricity generally relies on photovoltaics, wind power, water potential, etc. However, wind energy and solar energy generally have problems such as strong intermittency and large volatility, which will cause grid instability, insufficient electricity during peak electricity consumption, and too much electricity during low electricity consumption. The unstable voltage will also damage the power. Therefore, the problem of "abandoning wind and light" may be caused by insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage is required. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and the energy is converted back into electrical energy and released when needed. Simply put, energy storage is similar to a large "portable power bank". When photovoltaics and wind energy are sufficient, electrical energy is stored, and the stored electrical energy is released when needed.

[0030] Taking electrochemical energy storage as an example, the embodiments of the present application provide an electrical device. A set of chemical batteries are provided inside the electrical device, which mainly uses the chemical elements in the chemical batteries as energy storage media. The charge and discharge process is accompanied by chemical reactions or changes in the energy storage media. Simply put, the electrical energy generated by wind energy and solar energy is stored in the chemical batteries, and the stored electricity is released when the external electricity usage reaches the peak, or transferred to places with a shortage of electricity for further use.

[0031] Currently, the application scenarios of energy storage are relatively wide, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The types of corresponding electrical devices include: The large energy storage container applied to the grid side energy storage scenario can be used as a high-quality active and reactive power regulation power source in the grid, realizing the load matching of electrical energy in time and space, enhancing the consumption capacity of renewable energy, and being of great significance in grid system standby, alleviating the power supply pressure during peak loads, and peak shaving and frequency modulation.

[0032] The small and medium-sized energy storage cabinets applied to the industrial and commercial energy storage scenarios on the user side and the household small energy storage boxes applied to the household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Since there is a large price difference in electricity charges at the peak and valley positions according to the electricity consumption demand, after users have electrical equipment, in order to reduce costs, they usually charge the energy storage cabinet / box during the low electricity price period; during the peak electricity price period, the electricity in the electrical equipment is released for use to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the existence of household electrical equipment is equivalent to providing a backup power source for users themselves and the grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0033] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the energy storage system 400 provided by the embodiments of the present application. The embodiments of the present application are described by taking the household energy storage scenario in the user-side energy storage as an example, and the electrical equipment 300 of the present application is not limited to the household energy storage scenario.

[0034] The embodiments of the present application provide an energy storage system 400, which includes an electric energy conversion device 410, a first user load 420, a second user load 430, and an electrical equipment 300. The electrical equipment 300 is a small energy storage box and can be installed on an outdoor wall in a wall-mounted manner. Specifically, the photovoltaic panel can convert solar energy into electric energy during the low electricity price period, and the electrical equipment 300 is used to store the electric energy and supply street lamps and household appliances for use during the high electricity price period, or supply power when the power grid is powered off / out of power.

[0035] Among them, the electrical equipment 300 may include, but is not limited to, single cells, battery modules, battery packs, battery systems, etc. When the electrical equipment 300 includes multiple batteries 200, the multiple batteries 200 are electrically connected and are all located inside the housing of the electrical equipment 300, and they can be protected by the housing from external environmental interference. Exemplarily, the multiple batteries 200 are arranged at intervals. The multiple batteries 200 can be connected in series, or in parallel, or in a mixed connection of series and parallel to achieve a larger capacity and power. The embodiments of the present application are described by taking the electrical equipment 300 including the battery 200 as an example, but it should be understood that the electrical equipment 300 is not limited thereto.

[0036] Optionally, the battery 200 can be a secondary battery, which refers to a battery cell that can be activated by charging after the battery cell is discharged and can be used continuously. The battery 200 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the present application does not make specific limitations thereto.

[0037] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of a battery 200 provided by the embodiments of the present application.

[0038] For the convenience of description below, the length direction of the battery 200 is defined as the X direction, the width direction of the battery 200 is defined as the Y direction, and the height direction of the battery 200 is defined as the Z direction. The X direction, the Y direction, and the Z direction are perpendicular to each other pairwise.

[0039] The battery 200 may include a top cover assembly 100, a shell 210, and an electrode assembly 220. The top cover assembly 100 is connected to the shell 210, and is surrounded by the shell 210 to form a receiving space, and the electrode assembly 220 is located in the receiving space. Exemplarily, the top cover assembly 100 can be welded to the shell 210 by welding. The shell 210 can be made of a metal material, such as an aluminum alloy. The battery 200 can be a cylindrical battery 200 or a square battery 200, etc.

[0040] Among them, the electrode assembly 220 may include at least two battery cells (not shown). At least two battery cells are arranged in sequence along the thickness direction of the battery 200. The provision of multiple battery cells can increase the capacity of the battery 200, so that the battery 200 can be used for a long time, thereby increasing the applicable scenarios of the battery 200. Each battery cell may include a winding core, a first pole ear and a second pole ear. The first pole ear and the second pole ear are both connected to the winding core. The polarity of the first pole ear and the second pole ear are opposite, one is a positive pole ear and the other is a negative pole ear.

[0041] The battery cell may include two first side surfaces and two second side surfaces. The two first side surfaces may be spaced apart along the Y direction. The two second side surfaces may be spaced apart along the X direction. Each first side surface is connected between the two second side surfaces. The area of ​​the first side surface is greater than the area of ​​the second side surface. That is, the first side surface is the larger surface in the battery cell.

[0042] It should be noted that Figure 2 The purpose of the above description is only to schematically describe the connection relationship between the top cover assembly 100, the housing 210 and the electrode assembly 220, and it does not specifically limit the connection position, specific structure and quantity of each component. The structure shown in the embodiment of the present application does not constitute a specific limitation on the battery 200. In other embodiments of the present application, the battery 200 may include Figure 2 More or fewer components may be shown, or some components may be combined or separated, or the components may be arranged differently. Figure 2 The components shown may be implemented in hardware, software or a combination of software and hardware.

[0043] Please refer to Figure 2 , Figure 3a , Figure 3b and Figure 4 , Figure 3a is along Figure 2 The schematic diagram of the partial structure of the battery 200 obtained by cutting along the cutting line AA shown in FIG. Figure 3b yes Figure 2 The schematic diagram of the partial structure of the housing 210 of the battery 200 shown in FIG. Figure 4 yes Figure 3a Schematic diagram of the enlarged structure of the S region shown.

[0044] The housing 210 may include two first side portions 2110 and two second side portions 2120. The two first side portions 2110 are opposite and spaced apart along the Y direction. The two second side portions 2120 are opposite and spaced apart along the X direction. Each first side portion 2110 is connected between the two second side portions 2120. Each first side portion 2110 is disposed opposite to a first side surface of the battery cell along the Y direction.

[0045] The first side portion 2110 may include a main body portion 2130 and a welding portion 2140. The welding portion 2140 is connected to one side of the main body portion 2130 along the Z direction. One end of the welding portion 2140 away from the main body portion 2130 may cooperate with the second side portion 2120 to jointly enclose an opening for installing the top cover assembly 100. One end of the welding portion 2140 away from the main body portion 2130 may be welded to the top cover assembly 100. The thickness of the welding portion 2140 may be greater than the thickness of the main body portion 2130. In the width direction of the housing 210 (the illustrated Y direction), the welding portion 2140 is spaced apart from the projection of the battery cell on the first side portion 2110. That is, the welding portion 2140 is spaced apart from the projection of the battery cell on the first side portion 2110 along the width direction of the housing 210. That is, the bottom height of the welding portion 2140 is higher than the height of the battery cell.

[0046] Wherein, the extension dimension of the main body portion 2130 along the Z direction may be greater than the extension dimension of the welding portion 2140 along the Z direction, so that the housing 210 has a lighter weight on the basis of improving the structural strength and connection stability through the welding portion 2140. In addition, the welding portion 2140 protrudes towards one side of the space enclosed by the housing 210 relative to the main body portion 2130, which can make the shape of the appearance surface of the battery 200 more regular, facilitate arranging multiple batteries 200 close to each other during use, and reduce the gap. Exemplarily, the thickness of the main body portion 2130 may be 0.6 mm, and the thickness of the welding portion 2140 may be 0.8 mm. In addition, as Figure 3b shown, the welding portion 2140 may be limited between two transition rounded corners R in the length direction of the housing 210 (the illustrated X direction).

[0047] It can be understood that since only the mouth area of the housing 210 is welded to the top cover assembly 100, the mouth area of the first side portion 2110 of the housing 210, which is disposed opposite to the large surface of the battery cell, is designed as a thickened area, and the non-mouth area is designed as a non-thickened area. On the basis of minimizing costs, the structural strength of the thickened position can be improved by increasing the local thickness of the welding area between the first side portion 2110 and the top cover assembly 100, so as to ensure that there is a large connection area at the welding joint between the housing 210 and the top cover assembly 100, improve the connection strength, make the connection between the top cover 10 and the housing 210 stable and reliable, and extend the weld life between the top cover 10 and the housing 210. Moreover, only thickening the mouth area of the first side portion 2110 will not reduce the available space inside the housing 210, which is beneficial to ensuring the space utilization rate inside the housing 210. In addition, the area of the first side portion 2110 in the housing 210 is relatively large, and not thickening the non-mouth area of the large surface can achieve the maximum cost reduction.

[0048] Please continue to refer to Figure 3a and Figure 4 , the first side portion 2110 further includes a transition portion 2150, and the transition portion 2150 is connected between the welding portion 2140 and the main body portion 2130. The thickness of the transition portion 2150 gradually increases from the main body portion 2130 to the direction of the welding portion 2140.

[0049] It can be understood that by connecting the transition portion 2150 between the welding portion 2140 and the main body portion 2130 and making the transition portion 2150 have a gradually changing thickness structure, it can smoothly transition from the main body portion 2130 with a smaller thickness to the welding portion 2140 with a larger thickness, which is beneficial to dispersing the stress received by the housing 210 and avoiding the problem of stress concentration at the connection due to too rapid thickness change.

[0050] Please refer to in combination with Figure 5 and Figure 6 , Figure 5 is a schematic structural diagram of the top cover assembly 100 provided by the embodiment of the present application, Figure 6 is Figure 5 the exploded structural diagram of the top cover assembly 100 shown in

[0051] In this embodiment, the top cover assembly 100 may include a top cover 10, an upper plastic 20, a lower plastic 30, a terminal 40, a connecting piece 51, a sealing ring 52, a pressure ring 53, a limiting body 54, a support member 60, a heat insulation sheet 70, and an explosion-proof valve assembly 80.

[0052] The upper plastic 20 and the lower plastic 30 are both installed on the top cover 10. The upper plastic 20 is installed on one side of the top cover 10 in the thickness direction (the Z direction shown in the figure), and the lower plastic 30 is installed on the other side of the top cover 10 in the thickness direction. Moreover, the lower plastic 30 and the upper plastic 20 protrude respectively from two opposite surfaces of the top cover 10 in the thickness direction. Among them, the number of the upper plastics 20 can be two. The two upper plastics 20 are installed at intervals on both sides of the top cover 10 in the length direction (the X direction shown in the figure).

[0053] The terminal post 40 is installed on the top cover 10, the upper plastic 20 and the lower plastic 30, and is insulated from the top cover 10 through the upper plastic 20, the lower plastic 30 and the sealing ring 52. The terminal post 40 can also be used as the electrode lead-out of the battery 200 to realize the electrical connection between the battery 200 and external devices. Among them, the number of the terminal posts 40 can be two. The two terminal posts 40 can be the negative terminal post and the positive terminal post respectively. The two terminal posts 40 can be arranged at intervals in the length direction of the top cover 10. Each terminal post 40 is installed on the lower plastic 30, the top cover 10 and one upper plastic 20.

[0054] The connecting piece 51 is located on the side of the lower plastic 30 facing away from the top cover 10, is connected to the terminal post 40, and is also welded to the tab of the electrode assembly 220 to realize the electrical connection between the terminal post 40 and the electrode assembly 220. Among them, the number of the connecting pieces 51 can be two. The two connecting pieces 51 can be the positive connecting piece and the negative connecting piece respectively. The two connecting pieces 51 can be arranged at intervals in the length direction (the X direction shown in the figure) of the lower plastic 30. Each connecting piece 51 is connected to one terminal post 40.

[0055] The sealing ring 52 is sleeved on the outside of the terminal post 40, and is located between the lower plastic 30 and the terminal post 40, as well as between the top cover 10 and the terminal post 40. The sealing ring 52 can be used to seal the gap between the top cover 10 and the terminal post 40, and prevent the electrolyte from invading here, which may lead to the reduction of the insulation between the top cover 10 and the terminal post 40 and the safety of the electrode assembly 220. Among them, the number of the sealing rings 52 can be two. Among the two sealing rings 52, one sealing ring 52 is sleeved on the positive terminal post, and the other sealing ring 52 is sleeved on the negative terminal post.

[0056] The pressure ring 53 is installed on the upper plastic 20, is sleeved on the outside of the terminal post 40, and is electrically connected to the terminal post 40. Among them, the number of the pressure rings 53 can be two. The two pressure rings 53 are respectively installed on the two upper plastics 20 and are respectively electrically connected to the two terminal posts 40.

[0057] The limiting body 54 is inserted through the upper plastic 20 and is located between the pressing ring 53 and the top cover 10. Among them, the number of the limiting bodies 54 can be multiple. Multiple limiting bodies 54 are inserted through the two upper plastics 20 at intervals and are located between the top cover 10 and the two pressing rings 53. Exemplarily, the number of the limiting bodies 54 can be six. Among them, three limiting bodies 54 are inserted through one upper plastic 20 at intervals and are located between the top cover 10 and one pressing ring 53. The other three limiting bodies 54 are inserted through the other upper plastic 20 at intervals and are located between the top cover 10 and the other pressing ring 53.

[0058] The support member 60 is installed on the lower plastic 30 and is located between the lower plastic 30 and the top cover 10. The support member 60 abuts against the lower plastic 30 and can support the top cover 10. When the battery cell undergoes thermal runaway, the support member 60 can support between the battery cell and the top cover 10, keep a certain distance between the two, prevent the battery cell from floating up close to the top cover 10, and further inhibit the electric spark from splashing out of the explosion-proof valve 81, reducing the risk of the battery cell catching fire. Exemplarily, the number of the support members 60 can be two. The two support members 60 can be opposite and spaced apart in the Y direction. Each support member 60 is installed on the lower plastic 30 and is used to support the top cover 10.

[0059] The heat insulation sheet 70 is located between the lower plastic 30 and the connecting piece 51 to play a good heat insulation role. Among them, the number of the heat insulation sheets 70 can be four. Two of the heat insulation sheets 70 are located between the top cover 10 and one connecting piece 51, and the other two heat insulation sheets 70 are located between the top cover 10 and the other connecting piece 51.

[0060] The explosion-proof valve assembly 80 is installed on the top cover 10 and is used for the pressure relief protection of the battery 200.

[0061] The structures of the components in the top cover assembly 100 and the assembly relationships between the components will be described in detail below with reference to the accompanying drawings.

[0062] Please refer to Figure 7 、 Figure 8 and Figure 9 , Figure 7 which is Figure 5 a schematic structural diagram of the top cover 10 of the top cover assembly 100 shown in a certain angle, Figure 8 which is Figure 5 a schematic structural diagram of the top cover 10 of the top cover assembly 100 shown in another angle, Figure 9 which is Figure 5 a schematic structural diagram of the top cover 10 of the top cover assembly 100 shown in yet another angle.

[0063] The top cover 10 may include a first surface 101 and a third surface 102. The first surface 101 and the third surface 102 may be arranged opposite to each other in the thickness direction of the top cover 10 (the illustrated Z direction). Among them, the first surface 101 may face the lower plastic 30, and the third surface 102 may face away from the lower plastic 30.

[0064] The top cover 10 may be provided with a first pole hole 11. The first pole hole 11 may penetrate through the top cover 10 along the thickness direction of the top cover 10 and may be used for the pole 40 to pass through. Among them, the number of the first pole holes 11 may be two. The two first pole holes 11 may be spaced apart in the length direction of the top cover 10 (the illustrated X direction). The two first pole holes 11 may be respectively used for the positive pole 40 and the negative pole 40 to pass through.

[0065] The top cover 10 may also be provided with an explosion-proof hole 12. The explosion-proof hole 12 penetrates through the top cover 10 along the thickness direction of the top cover 10 and is spaced apart from the first pole hole 11. Exemplarily, the explosion-proof hole 12 may be located between the two first pole holes 11. Further, the top cover 10 may be provided with a mounting table 103 and a groove 104. The mounting table 103 may be provided on the third surface 102 and protrude from the third surface 102 in a direction away from the top cover 10. The mounting table 103 may also be disposed around the outer edge of the explosion-proof hole 12. The opening of the groove 104 may be located on the first surface 101. The groove 104 may be recessed from the first surface 101 into the interior of the top cover 10. The groove 104 may be coaxially arranged with and communicate with the explosion-proof hole 12.

[0066] The top cover 10 may also be provided with a positioning hole 13. The opening of the positioning hole 13 may be located on the first surface 101. The positioning hole 13 may be recessed from the first surface 101 into the interior of the top cover 10. The positioning hole 13 may be located on a side of the first pole hole 11 away from the explosion-proof hole 12 and be spaced apart from both the first pole hole 11 and the explosion-proof hole 12. The positioning hole 13 may be a blind hole.

[0067] Among them, the number of the positioning holes 13 may be multiple. The structures of the multiple positioning holes 13 may be similar, the same or different. The multiple positioning holes 13 may be distributed on both sides in the length direction of the top cover 10 and on both sides in the width direction of the top cover 10 (the illustrated Y direction). The multiple positioning holes 13 may be spaced apart from both the explosion-proof hole 12 and the two first pole holes 11.

[0068] Exemplarily, the number of the positioning holes 13 may be four. Among the four positioning holes 13, they may be divided into two groups of positioning holes 13 with two positioning holes 13 in each group. The two groups of positioning holes 13 may be respectively located on both sides in the length direction of the top cover 10 (such as symmetrically distributed). Among the two positioning holes 13 in the same group of positioning holes 13, the two positioning holes 13 may also be respectively located on both sides in the width direction of the top cover 10 (such as symmetrically distributed).

[0069] The top cover 10 may also be provided with at least one hot melt hole Q. The opening of the at least one hot melt hole Q may be located on the first surface 101. The at least one hot melt hole Q may be recessed from the first surface 101 toward the inside of the top cover 10. The recessed depth of the at least one hot melt hole Q relative to the first surface 101 may be greater than the recessed depth of the positioning hole 13 relative to the first surface 101.

[0070] Please refer to Figure 8 and Figure 10 , Figure 10 is along Figure 8 The cross-sectional schematic diagram of a partial structure of the top cover 10 obtained by cutting along the cutting line BB is shown.

[0071] Each hot melt hole Q may include a first sub-hole Q1, a second sub-hole Q2 and a third sub-hole Q3. The opening of the first sub-hole Q1 is located on the first surface 101. The first sub-hole Q1, the second sub-hole Q2 and the third sub-hole Q3 may be connected in sequence and coaxially arranged. The dimension H1 of the first sub-hole Q1 along the length direction of the top cover 10 (the X direction in the figure) is smaller than the dimension H3 of the third sub-hole Q3 along the length direction of the top cover 10, and the dimension H2 of the second sub-hole Q2 along the length direction of the top cover 10 may gradually increase from the first sub-hole Q1 to the third sub-hole Q3.

[0072] In a possible implementation, Figure 10 As shown, the top cover 10 may also be provided with a glue containing groove 15. The opening of the glue containing groove 15 may be located on the first surface 101. The glue containing groove 15 may be formed by being recessed from the first surface 101 to the inside of the top cover 10. The glue containing groove 15 may be arranged around the opening of the hot melt hole Q and communicated with the hot melt hole Q. Exemplarily, the glue containing groove 15 may be arranged around the periphery of the first sub-hole Q1 and communicated with the first sub-hole Q1. The depth of the glue containing groove 15 may be less than the depth of the first sub-hole Q1.

[0073] Please refer to Figure 8 , Figure 9 and Figure 10 In an embodiment of the present application, at least one hot melt hole Q may include at least one or more of the first hot melt hole 16, the second hot melt hole 14, and the third hot melt hole 18. Exemplarily, at least one hot melt hole Q may include the first hot melt hole 16, or include the first hot melt hole 16 and the second hot melt hole 14, or include the first hot melt hole 16, the second hot melt hole 14, and the third hot melt hole 18.

[0074] The opening of the second hot melt hole 14 may be located on the first surface 101. The second hot melt hole 14 may be recessed from the first surface 101 into the interior of the top cover 10. The recessed depth of the second hot melt hole 14 relative to the first surface 101 may be greater than the recessed depth of the positioning hole 13 relative to the first surface 101. The second hot melt hole 14 may be located between the first pole hole 11 and the explosion-proof hole 12, and is spaced from both the first pole hole 11 and the explosion-proof hole 12. The second hot melt hole 14 may be adjacent to the explosion-proof hole 12. The second hot melt hole 14 may be a blind hole. Among them, the second hot melt hole 14 may include a first sub-hole Q1, a second sub-hole Q2, and a third sub-hole Q3. A glue receiving groove 15 is disposed around the outside of the first sub-hole Q1 of the second hot melt hole 14.

[0075] In the width direction of the top cover 10, the distance D1 between the central axis O1 of the second hot melt hole 14 and the central axis R of the first pole hole 11 may be different from the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11. In this way, the positioning hole 13 for positioning and the second hot melt hole 14 for fixing can be quickly distinguished according to the different distances from the first pole hole 11, which plays a certain anti-fooling role and avoids the problem of misassembly between various holes, and is beneficial to improving the assembly efficiency and assembly accuracy of the top cover assembly 100. Exemplarily, the distance D1 between the central axis O1 of the second hot melt hole 14 and the central axis R of the first pole hole 11 may be greater than the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11. Of course, in some other embodiments, the distance D1 between the central axis O1 of the second hot melt hole 14 and the central axis R of the first pole hole 11 may also be less than or equal to the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11, and this is not strictly limited.

[0076] Among them, the number of the second hot melt holes 14 may be multiple. The structures of the multiple second hot melt holes 14 may be similar, the same, or different. The multiple second hot melt holes 14 may be distributed on both sides of the explosion-proof hole 12 along the length direction of the top cover 10 and on both sides of the explosion-proof hole 12 along the width direction of the top cover 10.

[0077] Exemplarily, the number of the second hot melt holes 14 may be four. Among the four second hot melt holes 14, they may be divided into two first hole groups with two second hot melt holes 14 in each group. The two first hole groups may be respectively located on both sides of the explosion-proof hole 12 along the length direction of the top cover 10 (such as symmetrically distributed). Among the two second hot melt holes 14 in the same first hole group, the two second hot melt holes 14 may also be respectively located on both sides of the explosion-proof hole 12 along the width direction of the top cover 10 (such as symmetrically distributed).

[0078] Please refer to Figure 8 、 Figure 9And Figure 11 , Figure 11 is a schematic cross-sectional view of another partial structure of the top cover 10 obtained by cutting along the cutting line B-B shown in Figure 8 .

[0079] The opening of the first hot melt hole 16 may be located on the first surface 101. The first hot melt hole 16 may be recessed from the first surface 101 into the interior of the top cover 10. The recessed depth of the first hot melt hole 16 relative to the first surface 101 may be greater than the recessed depth of the positioning hole 13 relative to the first surface 101. The first hot melt hole 16 may be located between the positioning hole 13 and the second hot melt hole 14, and is spaced from the positioning hole 13, the second hot melt hole 14, the first pole hole 11, and the explosion-proof hole 12. The first hot melt hole 16 may be adjacent to the first pole hole 11. The first hot melt hole 16 may be a blind hole. Among them, the first hot melt hole 16 may include a first sub-hole Q1, a second sub-hole Q2, and a third sub-hole Q3. Among them, a glue receiving groove 15 is disposed around the outside of the first sub-hole Q1 of the first hot melt hole 16. The first hot melt hole 16 may be covered by the projection of the connecting piece 51 on the top cover 10 in the Z direction. In this setting, the first hot melt hole 16 may be located in the connection area between the connecting piece 51 and the tab of the electrode assembly 220.

[0080] In the width direction of the top cover 10, the distance D3 between the central axis O3 of the first hot melt hole 16 and the central axis R of the first pole hole 11 may be different from the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11. In this way, the positioning hole 13 for positioning and the first hot melt hole 16 for fixing can be quickly distinguished according to the different distances from the first pole hole 11, which plays a certain anti-fooling role and avoids the problem of misassembly between various holes, which is beneficial to improving the assembly efficiency and assembly accuracy of the top cover assembly 100. Exemplarily, the distance D3 between the central axis O3 of the first hot melt hole 16 and the central axis R of the first pole hole 11 may be greater than the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11. Of course, in some other embodiments, the distance D3 between the central axis O3 of the first hot melt hole 16 and the central axis R of the first pole hole 11 may also be less than or equal to the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11, and this is not strictly limited. Further, the distance D3 between the central axis O3 of the first hot melt hole 16 and the central axis R of the first pole hole 11 may be the same as or different from the distance D1 between the central axis O1 of the second hot melt hole 14 and the central axis R of the first pole hole 11.

[0081] The number of the first hot melt holes 16 can be multiple. The structures of the multiple first hot melt holes 16 can be similar, identical or different. The multiple first hot melt holes 16 can be distributed on both sides of the length direction of the top cover 10 and on both sides of each first pole hole 11 along the width direction of the top cover 10.

[0082] Exemplarily, the number of the first heat melt holes 16 may be four. Among the four first heat melt holes 16, two first heat melt holes 16 may be grouped into two second hole groups. The two second hole groups may be located on both sides of the length direction of the top cover 10 (e.g., symmetrically distributed). Among the two first heat melt holes 16 in the same second hole group, the two first heat melt holes 16 may also be located on both sides of the first pole hole 11 along the width direction of the top cover 10 (e.g., symmetrically distributed).

[0083] Please refer to Figure 8 , Figure 9 and Figure 12 , Figure 12 is along Figure 8 The cross-sectional schematic diagram of a partial structure of the top cover 10 obtained by cutting along the cutting line CC is shown.

[0084] The opening of the third hot melt hole 18 can be located on the first surface 101. The third hot melt hole 18 can be recessed from the first surface 101 to the inside of the top cover 10. The recess depth of the third hot melt hole 18 relative to the first surface 101 can be greater than the recess depth of the positioning hole 13 relative to the first surface 101. The third hot melt hole 18 can be located at the end of the length direction of the top cover 10. The third hot melt hole 18 can also be located on the side of the positioning hole 13 away from the first hot melt hole 16, and is spaced from the positioning hole 13, the second hot melt hole 14, the first hot melt hole 16, the first pole hole 11 and the explosion-proof hole 12. The third hot melt hole 18 can be a blind hole. Among them, the third hot melt hole 18 can include a first sub-hole Q1, a second sub-hole Q2 and a third sub-hole Q3. Among them, a glue-containing groove 15 is arranged around the outer side of the first sub-hole Q1 of the third hot melt hole 18.

[0085] In the width direction of the top cover 10, the distance D4 between the central axis O4 of the third hot melt hole 18 and the central axis R of the first pole hole 11 may be different from the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11. In this way, the positioning hole 13 for positioning and the third hot melt hole 18 for fixing can be quickly distinguished according to different distances from the first pole hole 11, playing a certain anti-mistake role and avoiding the problem of misassembly between various holes, which is beneficial to improving the assembly efficiency and assembly accuracy of the top cover assembly 100. Exemplarily, the distance D4 between the central axis O4 of the third hot melt hole 18 and the central axis R of the first pole hole 11 may be less than the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11. Of course, in some other embodiments, the distance D4 between the central axis O4 of the third hot melt hole 18 and the central axis R of the first pole hole 11 may also be greater than or equal to the distance D2 between the central axis O2 of the positioning hole 13 and the central axis R of the first pole hole 11, and no strict limitation is imposed on this. Further, the distance D4 between the central axis O4 of the third hot melt hole 18 and the central axis R of the first pole hole 11 may be the same as or different from the distance D1 between the central axis O1 of the second hot melt hole 14 and the central axis R of the first pole hole 11, and may also be the same as or different from the distance D3 between the central axis O3 of the first hot melt hole 16 and the central axis R of the first pole hole 11.

[0086] Wherein, the number of the third hot melt holes 18 may be multiple. The structures of the multiple third hot melt holes 18 may be similar, the same or different. The multiple third hot melt holes 18 may be distributed on both sides in the length direction of the top cover 10 and on both sides in the width direction of the top cover 10.

[0087] Exemplarily, the number of the third hot melt holes 18 may be four. Among the four third hot melt holes 18, they may be divided into two groups of third holes with two third hot melt holes 18 in each group. The two groups of third holes may be respectively located on both sides in the length direction of the top cover 10 (such as symmetrically distributed). Among the two third hot melt holes 18 in the same group of third holes, the two third hot melt holes 18 may also be respectively located on both sides in the width direction of the top cover 10 (such as symmetrically distributed).

[0088] Please continue to refer to Figure 7 、 Figure 8 and Figure 9 , an extension part 106 is formed by the top cover 10 being recessed from the first surface 101 towards the third surface 102. The extension part 106 is connected around the outer edge of the top cover 10. The extension part 106 may be welded to the housing 210.

[0089] It can be understood that by providing a circle of extension portion 106 on the outer edge of the top cover 10, when the top cover 10 and the shell 210 are assembled, the extension portion 106 can be used as a step located on the outer edge of the top cover 10, so as to facilitate the overlap of the top cover 10 and the shell 210 and cooperate to complete the welding connection between the two, thereby improving reliability.

[0090] See also Figure 13 , Figure 13 is along Figure 5 The section line EE shown is a schematic cross-sectional view of a partial structure of the top cover assembly 100 .

[0091] The explosion-proof valve assembly 80 may include an explosion-proof valve 81 and an explosion-proof valve protection sheet 82. The explosion-proof valve 81 and the explosion-proof valve protection sheet 82 may both be mounted on the top cover 10 and arranged sequentially in the thickness direction of the top cover 10. Specifically, the explosion-proof valve 81 may be located in the groove 104 of the top cover 10 and cover the opening of the explosion-proof hole 12 located on the first surface 101 of the top cover 10. The explosion-proof valve protection sheet 82 may be connected to the mounting platform 103 of the top cover 10 and cover the opening of the explosion-proof hole 12 located on the third surface 102 of the top cover 10. The explosion-proof valve protection sheet 82 may also cover the explosion-proof valve 81.

[0092] Please refer to Figure 3a and Figure 14 , Figure 14 yes Figure 5 The structure diagram of the lower plastic 30 of the top cover assembly 100 is shown at an angle.

[0093] The lower plastic 30 may be stacked with the top cover 10. The lower plastic 30 may include a lower plastic body 31 and a positioning column 32. The lower plastic body 31 is located on one side of the thickness direction of the top cover 10. The lower plastic body 31 may include a second surface 311 and a fourth surface 312. The fourth surface 312 and the second surface 311 may be disposed opposite to each other in the thickness direction (Z direction in the figure) of the lower plastic 30. The second surface 311 may be disposed opposite to the first surface 101 of the top cover 10, and the fourth surface 312 may face the electrode assembly 220.

[0094] The lower plastic body 31 may be provided with a second pole hole 33. The second pole hole 33 may penetrate the lower plastic body 31 along the thickness direction of the lower plastic 30, and may be used for the pole 40 to pass through. The second pole hole 33 may be connected to the first pole hole 11 of the top cover 10. The number of the second pole holes 33 may be two. The two second pole holes 33 may be spaced apart in the length direction (X direction in the figure) of the lower plastic body 31. The two second pole holes 33 may be used for the positive pole 40 and the negative pole 40 to pass through, respectively.

[0095] The positioning post 32 can be fixedly connected to the lower plastic body 31 and protrude relative to the second surface 311 of the lower plastic body 31. The positioning post 32 can be spaced apart from the second pole hole 33. The positioning post 32 can be inserted into the positioning hole 13 of the lower plastic body 31 to achieve the plug-in connection between the positioning post 32 and the lower plastic body 31. The positioning post 32 can be spaced apart from the projection of the connecting piece 51 on the lower plastic 30 in the Z direction.

[0096] Wherein, the setting position of the positioning post 32 on the lower plastic body 31 can correspond to the setting position of the positioning hole 13 on the top cover 10. The shape of the positioning post 32 can be adapted to the shape of the positioning hole 13 of the top cover 10. The number of the positioning posts 32 can be the same as the number of the positioning holes 13 of the top cover 10, and both are multiple. The structures of the multiple positioning posts 32 can be similar, the same or different. The multiple positioning posts 32 can be distributed on both sides in the length direction (illustrated X direction) of the lower plastic 30 and on both sides in the width direction (illustrated Y direction) of the lower plastic 30. The multiple positioning posts 32 can be spaced apart from both of the two second pole holes 33.

[0097] Exemplarily, the number of the positioning posts 32 can be the same as the number of the positioning holes 13 of the top cover 10 and also be four. Among the four positioning posts 32, they can be divided into two groups of positioning posts according to two positioning posts 32 as a group. The two groups of positioning posts can be respectively located on both sides in the length direction of the lower plastic 30 (such as symmetrically distributed). Among the two positioning posts 32 in the same group of positioning posts, the two positioning posts 32 can also be respectively located on both sides in the width direction of the lower plastic 30 (such as symmetrically distributed).

[0098] It can be understood that by providing the positioning post 32 on the lower plastic 30 and the positioning hole 13 on the top cover 10, and making the positioning post 32 and the positioning hole 13 plugged together, the installation positioning between the lower plastic 30 and the top cover 10 can be quickly and conveniently realized, improving the assembly efficiency and assembly accuracy of the top cover assembly 100.

[0099] The lower plastic 30 can further include a central boss 34 and an edge boss 35. The central boss 34 and the edge boss 35 can both be fixedly connected to the lower plastic body 31 and both protrude relative to the fourth surface 312 of the lower plastic body 31. The central boss 34 and the edge boss 35 can both be used to abut against the electrode assembly 220.

[0100] Among them, the central boss 34 can be arranged opposite to the explosion-proof hole 12 of the top cover 10 in the Z direction. In the Z direction, the projection of the central boss 34 on the lower plastic body 31 partially overlaps with the projection of the explosion-proof hole 12 on the lower plastic body 31. That is, part of the central boss 34 can be covered by the projection of the explosion-proof hole 12 of the top cover 10 on the lower plastic 30 along the Z direction. It can be understood that the explosion-proof valve 81 installed at the explosion-proof hole 12 of the top cover 10 will exhaust when the battery cell is thermally runaway, which is the main force-bearing area when the battery 200 is thermally runaway. By setting the central boss 34 in the area where the explosion-proof hole 12 is located, the support for the top cover 10 can be enhanced, and the reliability of the top cover assembly 100 can be improved. The number of edge bosses 35 can be two. Among the two edge bosses 35, one edge boss 35 is located at one end of the length direction of the lower plastic body 31, and the other edge boss 35 is located at the other end of the length direction of the lower plastic body 31. That is, in the length direction of the lower plastic 30 , one edge boss 35 , the center boss 34 and another edge boss 35 are arranged in sequence.

[0101] Please refer to Figure 14 and Figure 15 , Figure 15 is along Figure 5 The section line FF shown is a schematic cross-sectional view of a partial structure of the top cover assembly 100.

[0102] The lower plastic 30 may further include at least one hot melt column T. The at least one hot melt column T is connected to the lower plastic body 31 and is protruding relative to the second surface 311 of the lower plastic body 31. The at least one hot melt column T may be located in at least one hot melt hole Q of the top cover 10. The at least one hot melt column T is fixedly connected to the at least one hot melt hole Q of the top cover 10 through a hot melt process so that the lower plastic body 31 fits the top cover 10. The at least one hot melt column T may include at least one or more of the first hot melt column 37, the second hot melt column 36 and the third hot melt column 38. Exemplarily, the at least one hot melt column T may include the first hot melt column 37, or include the first hot melt column 37 and the second hot melt column 36, or include the first hot melt column 37, the second hot melt column 36 and the third hot melt column 38.

[0103] The second hot melt post 36 is connected to the lower plastic body 31 and protrudes relative to the second surface 311 of the lower plastic body 31. The second hot melt post 36 can be located between the second pole hole 33 and the central boss 34 and is spaced from both the second pole hole 33 and the central boss 34. The second hot melt post 36 can be located within the second hot melt hole 14 of the top cover 10. The second hot melt post 36 and the second hot melt hole 14 of the top cover 10 are fixedly connected by a hot melting process so that the lower plastic body 31 and the top cover 10 are fitted together. The second hot melt post 36 can be adjacent to and spaced from the explosion-proof hole 12 of the top cover 10 in the projection along the Z direction on the lower plastic 30. Additionally, the second hot melt post 36 can also be spaced from the projection of the connecting piece 51 on the lower plastic 30 in the projection along the Z direction.

[0104] Among them, the setting position of the second hot melt post 36 on the lower plastic body 31 can correspond to the setting position of the second hot melt hole 14 on the top cover 10. The shape of the second hot melt post 36 after hot melting can be adapted to the shape of the second hot melt hole 14 of the top cover 10. The second hot melt post 36 can be adjacent to and spaced from the explosion-proof hole 12 of the top cover 10 in the projection along the Z direction on the lower plastic 30. Before the second hot melt post 36 and the second hot melt hole 14 are hot melt connected, the height of the second hot melt post 36 can be greater than the depth of the second hot melt hole 14 to ensure that the second hot melt post 36 after hot melting can fill the second hot melt hole 14 to the maximum extent.

[0105] It can be understood that by providing the second hot melt post 36 on the lower plastic 30 and the second hot melt hole 14 on the top cover 10 and fixedly connecting the second hot melt post 36 and the second hot melt hole 14 of the top cover 10 by a hot melting process, when the second hot melt post 36 undergoes hot melt deformation through the hot melting process, it can be closely fitted to the hole wall of the second hot melt hole 14 of the top cover 10, increasing the connection stability and reliability between the second hot melt post 36 and the second hot melt hole 14 of the top cover 10, so that the lower plastic body 31 and the top cover 10 can also be more closely fitted together, enhancing the connection strength between the lower plastic 30 and the top cover 10 and achieving the fixed connection between the lower plastic 30 and the top cover 10.

[0106] As Figure 10 and Figure 15 shown, the second hot melt post 36 can be filled in the first sub-hole Q1, the second sub-hole Q2, and the third sub-hole Q3 of the second hot melt hole 14.

[0107] It can be understood that by making the dimension H1 of the first sub-hole Q1 along the length direction of the top cover 10, the dimension H2 of the second sub-hole Q2 along the length direction of the top cover 10, and the dimension H3 of the third sub-hole Q3 along the length direction of the top cover 10 different from each other, the second hot melt hole 14 can be configured as a variable cross-section hole. The configuration of the variable cross-section hole can enable the second hot melt post 36 to be filled with the second hot melt hole 14 due to hot melt deformation when the second hot melt post 36 is hot melt connected to the second hot melt hole 14, thereby correspondingly presenting a variable cross-section structural form, which is beneficial to enhancing the bonding force between the lower plastic 30 and the top cover 10 after hot melting and improving the connection strength between the lower plastic 30 and the top cover 10.

[0108] Further, there may be a gap between the outer surface of the second hot melt post 36 and the wall of the glue-containing groove 15 communicating with the second hot melt hole 14.

[0109] It can be understood that by providing the glue-containing groove 15 and arranging the glue-containing groove 15 around the opening of the second hot melt hole 14, a certain gap space can be reserved at the opening of the second hot melt hole 14, so that when the second hot melt post 36 is hot melt connected to the second hot melt hole 14, the reserved glue-containing groove 15 can provide a flow space for the excess molten liquid caused by manufacturing tolerances, thereby further enhancing the stability and reliability of the assembly of the lower plastic 30 and the top cover 10.

[0110] In the embodiment of the present application, in the thickness direction (illustrated as the Z direction) of the lower plastic 30, the projection of the second hot melt post 36 on the lower plastic body 31 is adjacent to the projection of the central boss 34 on the lower plastic body 31 and is spaced apart in the length direction (illustrated as the X direction) of the lower plastic 30. That is, the projection of the second hot melt post 36 on the lower plastic body 31 along the thickness direction of the lower plastic 30 is adjacent to and spaced apart from the central boss 34. It can be understood that in the lower plastic 30, the peripheral area of the central boss 34 is the main stress-bearing area during the assembly of the battery 200. By arranging the second hot melt post 36 beside the central boss 34 of the lower plastic 30, the bonding force between the lower plastic 30 and the top cover 10 can be effectively improved, and the lower plastic 30 can be prevented from collapsing at the main stress point, so that the lower plastic 30 and the top cover 10 can be closely fitted.

[0111] Wherein, the number of the second hot melt posts 36 may be the same as the number of the second hot melt holes 14 of the top cover 10, and both are multiple. The multiple second hot melt posts 36 may be distributed on both sides of the central boss 34 along the length direction of the lower plastic 30, and on both sides of the central boss 34 along the length direction of the lower plastic 30.

[0112] For example, the number of the second hot melt columns 36 may be four. Among the four second hot melt columns 36, two second hot melt columns 36 may be grouped into two first column groups. The two first column groups may be located on both sides of the central boss 34 along the length direction of the lower plastic 30 (e.g., symmetrically distributed). Among the two second hot melt columns 36 in the same first column group, the two second hot melt columns 36 may also be located on both sides of the central boss 34 along the width direction of the lower plastic 30 (e.g., symmetrically distributed).

[0113] Please refer to Figure 14 and Figure 16 , Figure 16 is along Figure 5 The cross-sectional schematic diagram of another partial structure of the top cover assembly 100 obtained by cutting along the cutting line FF shown.

[0114] The first hot melt column 37 is connected to the lower plastic body 31 and is protruded relative to the second surface 311 of the lower plastic body 31. The first hot melt column 37 can be located between the positioning column 32 and the second hot melt column 36, and is spaced apart from the positioning column 32, the second hot melt column 36 and the second pole hole 33. The first hot melt column 37 can be located in the first hot melt hole 16 of the top cover 10. The first hot melt column 37 is fixedly connected to the first hot melt hole 16 of the top cover 10 through a hot melt process, so that the lower plastic body 31 fits the top cover 10. The first hot melt column 37 can be adjacent to the second pole hole 33 and spaced apart.

[0115] The setting position of the first hot melt column 37 on the lower plastic body 31 may correspond to the setting position of the first hot melt hole 16 on the top cover 10. The shape of the first hot melt column 37 after hot melting may match the shape of the first hot melt hole 16 of the top cover 10. Before the first hot melt column 37 is hot-melted to the first hot melt hole 16, the height of the first hot melt column 37 may be greater than the depth of the first hot melt hole 16 to ensure that the first hot melt column 37 after hot melting can fill the first hot melt hole 16 to the maximum extent.

[0116] It can be understood that by providing a first hot melt column 37 on the lower plastic 30 and a first hot melt hole 16 on the top cover 10, and the first hot melt column 37 and the first hot melt hole 16 of the top cover 10 are fixedly connected through a hot melt process, when the first hot melt column 37 is hot-melted and deformed through the hot melt process, it can be tightly fitted together with the hole wall of the first hot melt hole 16 of the top cover 10, thereby increasing the connection stability and reliability between the first hot melt column 37 and the first hot melt hole 16 of the top cover 10, so that the lower plastic body 31 and the top cover 10 can also be more closely fitted together, thereby enhancing the connection strength between the lower plastic 30 and the top cover 10, and realizing a fixed connection between the lower plastic 30 and the top cover 10.

[0117] like Figure 11 andFigure 16 As shown, the first hot melt post 37 can be filled in the first sub-hole Q1, the second sub-hole Q2, and the third sub-hole Q3 of the first hot melt hole 16.

[0118] It can be understood that by making the dimension H1 of the first sub-hole Q1 along the length direction of the top cover 10, the dimension H2 of the second sub-hole Q2 along the length direction of the top cover 10, and the dimension H3 of the third sub-hole Q3 along the length direction of the top cover 10 different from each other, the first hot melt hole 16 can be configured as a variable cross-section hole. The configuration of the variable cross-section hole enables the first hot melt post 37 to be filled with the first hot melt hole 16 due to hot melt deformation when the first hot melt post 37 is hot melt connected to the first hot melt hole 16, thereby correspondingly presenting a variable cross-section structural form, which is beneficial to enhancing the bonding force between the lower plastic 30 and the top cover 10 after hot melting and improving the connection strength between the lower plastic 30 and the top cover 10.

[0119] Furthermore, there can be a gap between the outer surface of the first hot melt post 37 and the wall of the glue-containing groove 15 communicating with the first hot melt hole 16.

[0120] It can be understood that by providing the glue-containing groove 15 and arranging the glue-containing groove 15 around the opening of the first hot melt hole 16, a certain gap space can be reserved at the opening of the first hot melt hole 16, so that when the first hot melt post 37 is hot melt connected to the first hot melt hole 16, the reserved glue-containing groove 15 can provide a flow space for the excess molten liquid caused by manufacturing tolerances, thereby further enhancing the stability and reliability of the assembly of the lower plastic 30 and the top cover 10.

[0121] In the embodiment of the present application, in the Z direction, the projection of the first hot melt post 37 on the lower plastic body 31 falls within the projection range of the connecting piece 51 on the lower plastic body 31. That is, the first hot melt post 37 is covered by the projection of the connecting piece 51 on the lower plastic 30 in the Z direction.

[0122] It can be understood that since the connecting piece 51 needs to be connected to the pole 40 and welded to the pole ear of the electrode assembly 220 to form an electrical connection path between the pole 40 and the pole ear of the electrode assembly 220. However, such a welding process will cause the temperature in the area where the connecting piece 51 is located to be too high during welding, which is likely to cause the lower plastic 30 to be deformed by heat. Therefore, in order to prevent the lower plastic 30 from being bent and deformed due to excessive welding heat during the welding process, and to make the first hot melt post 37 be covered by the projection of the connecting piece 51 on the lower plastic 30 in the Z direction, the first hot melt post 37 can be arranged in the area where the lower plastic 30 is prone to be deformed by heat, thereby effectively strengthening the connection strength between the lower plastic 30 and the top cover 10 and avoiding the problems of the lower plastic 30 collapsing and the top cover assembly 100 failing due to the heat deformation of the lower plastic 30.

[0123] The number of the first hot melt columns 37 can be the same as the number of the first hot melt holes 16 of the top cover 10, and both can be multiple. The multiple first hot melt columns 37 can be distributed at intervals within the projection range of the multiple connecting pieces 51 on the lower plastic 30 along the Z direction. The multiple first hot melt columns 37 can be distributed on both sides of the length direction of the lower plastic 30, and on both sides of each second pole hole 33 along the width direction of the lower plastic 30.

[0124] Exemplarily, the number of the first hot melt columns 37 may be four. Among the four first hot melt columns 37, two first hot melt columns 37 may be grouped into two second column groups. The two second column groups may be located on both sides of the length direction of the lower plastic 30 (e.g., symmetrically distributed). In the two first hot melt columns 37 of the same second column group, the two first hot melt columns 37 may also be located on both sides of the second pole hole 33 along the width direction of the lower plastic 30 (e.g., symmetrically distributed). Each first hot melt column 37 may be covered by a projection of a connecting piece 51 on the lower plastic 30 along the Z direction. The two first hot melt columns 37 of the same group may be covered by the projection of the same connecting piece 51 on the lower plastic 30 along the Z direction.

[0125] Please refer to Figure 14 and Figure 17 , Figure 17 is along Figure 5 The section line GG shown is a schematic cross-sectional view of another partial structure of the top cover assembly 100 .

[0126] The third hot melt column 38 is connected to the lower plastic body 31 and is protruded relative to the second surface 311 of the lower plastic body 31. The third hot melt column 38 can be located at the end of the length direction of the lower plastic 30. The third hot melt column 38 can also be located on the side of the positioning column 32 away from the first hot melt column 37, and is spaced apart from the positioning column 32, the second hot melt column 36, the first hot melt column 37, and the second pole hole 33. The third hot melt column 38 can be located in the third hot melt hole 18 of the top cover 10. The third hot melt column 38 is fixedly connected to the third hot melt hole 18 of the top cover 10 through a hot melt process so that the lower plastic body 31 fits the top cover 10. The third hot melt column 38 can be adjacent to the second pole hole 33 and spaced apart. Further, part of the third hot melt column 38 can be located in the lower plastic body 31 and the edge boss 35.

[0127] Among them, the setting position of the third hot melt post 38 on the lower plastic body 31 can correspond to the setting position of the third hot melt hole 18 on the top cover 10. The shape of the third hot melt post 38 after hot melting can be adapted to the shape of the third hot melt hole 18 of the top cover 10. Before the third hot melt post 38 and the third hot melt post 38 are hot melt connected, the height of the third hot melt post 38 can be greater than the depth of the third hot melt post 38 to ensure that the third hot melt post 38 after hot melting can fill the third hot melt post 38 to the maximum extent.

[0128] It can be understood that by providing the third hot melt post 38 on the lower plastic 30 and the third hot melt hole 18 on the top cover 10, and fixedly connecting the third hot melt post 38 and the third hot melt hole 18 of the top cover 10 through a hot melting process, when the third hot melt post 38 undergoes hot melt deformation through the hot melting process, it can be closely attached to the hole wall of the third hot melt hole 18 of the top cover 10, increasing the connection stability and reliability between the third hot melt post 38 and the third hot melt hole 18 of the top cover 10, so that the lower plastic body 31 and the top cover 10 can also be more closely attached together, enhancing the connection strength between the lower plastic 30 and the top cover 10, and realizing the fixed connection between the lower plastic 30 and the top cover 10.

[0129] As Figure 12 and Figure 17 shown, the third hot melt post 38 can be filled in the first sub-hole Q1, the second sub-hole Q2, and the third sub-hole Q3 of the third hot melt hole 18.

[0130] It can be understood that by making the dimension H1 of the first sub-hole Q1 along the length direction of the top cover 10, the dimension H2 of the second sub-hole Q2 along the length direction of the top cover 10, and the dimension H3 of the third sub-hole Q3 along the length direction of the top cover 10 different from each other, the third hot melt hole 18 can be provided with a variable cross-section hole structure. The variable cross-section hole structure can enable the third hot melt post 38 to be filled with the third hot melt hole 18 due to hot melt deformation when the third hot melt post 38 and the third hot melt hole 18 are hot melt connected, and thus correspondingly present a variable cross-section structural form, which is beneficial to enhancing the bonding force between the lower plastic 30 and the top cover 10 after hot melting and improving the connection strength between the lower plastic 30 and the top cover 10.

[0131] Furthermore, there can be a gap between the outer surface of the third hot melt post 38 and the wall of the glue receiving groove 15 communicating with the third hot melt hole 18.

[0132] It can be understood that by providing the glue storage groove 15 and arranging the glue storage groove 15 around the opening of the third hot melt hole 18, a certain gap space can be reserved at the opening of the third hot melt hole 18. When the third hot melt post 38 is hot melt connected to the third hot melt hole 18, the reserved glue storage groove 15 can provide a flow space for the excess melt caused by manufacturing tolerances, thereby further enhancing the stability and reliability of the assembly of the lower plastic 30 and the top cover 10.

[0133] In the embodiment of the present application, in the thickness direction of the lower plastic 30, the projection of the third hot melt post 38 on the lower plastic body 31 falls within the projection range of the edge boss 35 on the lower plastic body 31. That is, the third hot melt post 38 is covered by the projection of the edge boss 35 on the lower plastic body 31 in the thickness direction of the lower plastic 30.

[0134] It can be understood that in the lower plastic 30, the peripheral area of the edge boss 35 is the main stress area during the assembly of the battery 200. In addition, there are hot melt sites on the side of the edge boss 35 that are in contact with the winding core insulating film. The temperature during hot melting will cause the edge boss of the lower plastic 30 to bend and collapse. Therefore, by arranging the third hot melt post 38 in the area where the edge boss 35 of the lower plastic 30 is located, the bonding force between the lower plastic 30 and the top cover 10 can be effectively improved, and the collapse stress of the lower plastic 30 can be evenly dispersed, preventing the end of the lower plastic 30 from collapsing, enabling the lower plastic 30 and the top cover 10 to be closely fitted, and improving the assembly performance of the lower plastic 30 and the top cover 10.

[0135] Among them, the number of the third hot melt posts 38 can be the same as the number of the third hot melt holes 18 of the top cover 10, and both are multiple. The multiple third hot melt posts 38 can be distributed on both sides in the length direction of the lower plastic 30 and on both sides in the width direction of the lower plastic 30.

[0136] Exemplarily, the number of the third hot melt posts 38 can be four. Among the four third hot melt posts 38, they can be divided into two groups of third post groups with two third hot melt posts 38 in each group. The two groups of third post groups can be respectively located on both sides in the length direction of the lower plastic 30 (such as symmetrically distributed). In the two third hot melt holes 18 of the same third post group, the two third hot melt holes 18 can also be respectively located on both sides in the width direction of the lower plastic 30 (such as symmetrically distributed). Each third hot melt post 38 can be covered by the projection of an edge boss 35 on the lower plastic body 31 in the Z direction. The two third hot melt posts 38 in the same group can be covered by the projection of the same edge boss 35 on the lower plastic body 31 in the Z direction.

[0137] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A top cover assembly, characterized in that, The top cover assembly includes a top cover and a lower plastic; The top cover comprises a first surface, the top cover is provided with at least one hot melt hole, the opening of the at least one hot melt hole is located on the first surface, and the at least one hot melt hole comprises a first hot melt hole; The lower plastic includes a lower plastic body and at least one hot melt column, the lower plastic body and the top cover are stacked, the lower plastic body includes a second surface, the second surface is arranged opposite to the first surface, the at least one hot melt column is connected to the lower plastic body and is protruded relative to the second surface, the at least one hot melt column is fixedly connected to the at least one hot melt hole through a hot melt process, so that the lower plastic body and the top cover are fitted, the at least one hot melt column includes a first hot melt column, and the first hot melt column is located in the first hot melt hole; The top cover assembly also includes a connecting piece, which is located on the side of the lower plastic away from the top cover, and is used for welding to the pole ear of the electrode assembly. In the thickness direction of the top cover assembly, the projection of the first hot melt column on the lower plastic body falls within the projection range of the connecting piece on the lower plastic body.

2. The top cover assembly according to claim 1, wherein, The at least one hot melt hole further includes a second hot melt hole, and the at least one hot melt column further includes a second hot melt column, and the second hot melt column is located in the second hot melt hole; The lower plastic also includes a central boss, which is connected to the lower plastic body and protrudes relative to the surface of the lower plastic body away from the top cover. In the thickness direction of the lower plastic, the projection of the second hot melt column on the lower plastic body is adjacent to the projection of the central boss on the lower plastic body and is spaced apart in the length direction of the lower plastic.

3. The top cover assembly according to claim 2, characterized in that, The at least one hot melt hole further includes a third hot melt hole, and the at least one hot melt column further includes a third hot melt column, and the third hot melt column is located in the third hot melt hole; The lower plastic also includes an edge boss, which is connected to the lower plastic body and protrudes relative to the surface of the lower plastic body away from the top cover. The edge boss is located at the end of the lower plastic body in the length direction. In the thickness direction of the lower plastic, the projection of the third hot melt column on the lower plastic body falls within the projection range of the edge boss on the lower plastic body.

4. The top cover assembly according to claim 1 or 2, characterized in that, Each of the hot melt holes includes a first sub-hole, a second sub-hole and a third sub-hole, the opening of the first sub-hole is located on the first surface, and the first sub-hole, the second sub-hole and the third sub-hole are sequentially connected in the thickness direction of the lower plastic and are coaxially arranged; The dimension of the first sub-hole along the length direction of the top cover is smaller than the dimension of the third sub-hole along the length direction of the top cover, and the dimension of the second sub-hole along the length direction of the top cover gradually increases from the first sub-hole to the third sub-hole; Each of the hot melt columns is filled in the first sub-hole, the second sub-hole and the third sub-hole.

5. The top cover assembly according to claim 4, characterized in that, The top cover further has a glue storage groove, the opening of the glue storage groove is located on the first surface, the glue storage groove is arranged around the periphery of the first sub-hole and communicates with the first sub-hole, and the depth of the glue storage groove is less than the depth of the first sub-hole.

6. The top cover assembly according to claim 2, characterized in that, The top cover is provided with an explosion-proof hole, and the explosion-proof hole penetrates through the top cover along the thickness direction of the top cover; In the thickness direction of the top cover assembly, the projection of the central boss on the lower plastic body overlaps partially with the projection of the explosion-proof hole on the lower plastic body.

7. The top cover assembly according to claim 3, characterized in that The top cover is provided with a positioning hole, the opening of the positioning hole is located on the first surface, and in the length direction of the top cover, the positioning hole is arranged between the first hot melt hole and the third hot melt hole in sequence; The lower plastic further includes a positioning post, and the positioning post is inserted into the positioning hole.

8. The top cover assembly according to claim 7, wherein, The top cover is provided with a first pole hole, and the first pole hole penetrates through the top cover along the thickness direction of the top cover; In the width direction of the top cover, the distance between the central axis of the second hot melt hole and the central axis of the first pole hole is different from the distance between the central axis of the positioning hole and the central axis of the first pole hole.

9. The top cover assembly according to claim 7, characterized in that, The top cover is provided with a first pole hole, and the first pole hole penetrates through the top cover along the thickness direction of the top cover; In the width direction of the top cover, the distance between the central axis of the first hot melt hole and the central axis of the first pole hole is different from the distance between the central axis of the positioning hole and the central axis of the first pole hole.

10. The top cover assembly according to claim 7, characterized in that, The top cover is provided with a first pole hole, and the first pole hole penetrates through the top cover along the thickness direction of the top cover; The third hot melt hole is located at the end of the length direction of the top cover, and in the width direction of the top cover, the distance between the central axis of the third hot melt hole and the central axis of the first pole hole is different from the distance between the central axis of the positioning hole and the central axis of the first pole hole.

11. The top cover assembly according to claim 1 or 2, characterized in that, The top cover further includes a third surface, the third surface is arranged opposite to the first surface in the thickness direction of the top cover, and the top cover is recessed from the first surface towards the third surface to form an extension part, the extension part is arranged around the outer edge of the top cover, and the extension part is used for welding connection with the housing.

12. A battery, characterized in that, The battery includes an electrode assembly, a housing and the top cover assembly according to any one of claims 1-11, the top cover assembly is connected to the housing and encloses with the housing to form an accommodation space, and the electrode assembly is located in the accommodation space.

13. The battery according to claim 12, characterized in that, The electrode assembly includes an electric core, the electric core includes two first side surfaces and two second side surfaces, the two first side surfaces are arranged opposite to each other in the width direction of the battery, the two second side surfaces are arranged opposite to each other in the length direction of the battery, each first side surface is connected between the two second side surfaces, and the area of the first side surface is larger than the area of the second side surface; The housing includes two first side parts, the two first side parts are arranged opposite to each other and spaced apart in the width direction of the battery, and each first side part is arranged opposite to one first side surface in the width direction of the battery; The first side portion includes a main body portion and a welding portion. The welding portion is connected to one side of the main body portion along the height direction of the battery. One end of the welding portion away from the main body portion is welded to the top cover. The thickness of the welding portion is greater than the thickness of the main body portion. In the width direction of the housing, the welding portion and the projection of the battery cell on the first side portion are arranged at intervals.

14. The battery according to claim 13, characterized in that, The first side portion further includes a transition portion. The transition portion is connected between the welding portion and the main body portion. The thickness of the transition portion gradually increases from the main body portion towards the welding portion.

15. An electrical device, characterized in that, The electrical device includes the battery according to any one of claims 12 - 14.

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