Top cover assembly, battery and electric equipment

Abstract

The invention provides a top cover assembly, a battery and electric equipment. The top cover assembly comprises lower plastic, a first pole and a first connecting piece, the lower plastic further comprises a lower plastic body and at least one convex rib, the lower plastic body is provided with a first through hole, the first through hole penetrates through the lower plastic body in the thickness direction of the lower plastic, and the at least one convex rib is fixedly connected to the lower plastic body and is spaced from the first through hole; the first pole penetrates through the first through hole; the first connecting piece is connected to the first pole, the first connecting piece is further used for being connected with a first tab of an electrode assembly in a welded mode so that the first pole and the electrode assembly can be electrically connected through the first connecting piece, and the first connecting piece and the lower plastic body are arranged in a stacked mode and are adjacent to at least one convex rib; the first connecting piece linearly extends along the width direction of the top cover assembly, and the center line of the first connecting piece in the length direction of the top cover assembly is deviated from the center line of the first pole. According to the technical scheme, battery failure can be avoided.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a top cover assembly, a battery, and an electrical device. Background Art

[0002] With the development of green energy and the enhancement of people's environmental awareness, batteries with recyclable characteristics are more and more widely used. A battery includes a battery cell, a housing, and a top cover assembly. The battery cell is located in the accommodation space formed by enclosing the housing and the top cover assembly. The top cover assembly includes a pole post and a connecting piece. The pole post and the connecting piece are welded together, and the connecting piece is also welded to the tab of the battery cell, so that the pole post and the battery cell are electrically connected through the connecting piece. At present, the connection between the connecting piece and the tab of the battery cell is likely to cause battery failure. Summary of the Invention

[0003] Embodiments of this application provide a top cover assembly, a battery, and an electrical device, which can avoid battery failure.

[0004] In a first aspect, this application provides a top cover assembly, which includes:

[0005] A lower plastic, which further includes a lower plastic body and at least one rib. The lower plastic body is provided with a first through hole that penetrates the lower plastic body along the thickness direction of the lower plastic. The at least one rib is fixedly connected to the lower plastic body and is spaced from the first through hole;

[0006] A first pole post, which penetrates through the first through hole; and

[0007] A first connecting piece, which is connected to the first pole post. The first connecting piece is also used for welding to the first tab of the electrode assembly, so that the first pole post and the electrode assembly are electrically connected through the first connecting piece. The first connecting piece is stacked with the lower plastic body and is adjacent to the at least one rib. The first connecting piece extends linearly along the width direction of the top cover assembly, and the center line of the first connecting piece in the length direction of the top cover assembly is offset relative to the center line of the first pole post.

[0008] It can be understood that in the top cover assembly of the related art, the connecting piece has a pole connection area for connecting with the pole and an ear connection area for connecting with the tab. The pole connection area and the ear connection area are arranged in a dislocation manner in the length direction of the top cover assembly, and have a small projection overlapping area or no projection overlapping area in the width direction of the top cover assembly. This causes the current to flow obliquely only along the inclination direction of the ear connection area relative to the pole connection area (i.e., the direction inclined to the width direction of the top cover assembly) during the process of flowing from the pole connection area to the ear connection area. The current flow path is long, resulting in low energy efficiency of the battery.

[0009] In this embodiment, since the first connecting piece has a certain area for connecting with the first pole and a certain area for connecting with the first tab. Therefore, when the first connecting piece is linearly extended along the width direction of the top cover assembly, the two areas, namely the area for connecting with the first pole and the area for connecting with the first tab in the first connecting piece, can be arranged in the same column or approximately in the same column along the width direction of the top cover assembly. That is, in the first connecting piece, the two areas, namely the area for connecting with the first pole and the area for connecting with the first tab, can have a certain projection overlapping area in the width direction of the top cover assembly. That is to say, in the first connecting piece, the area for connecting with the first tab can have a smaller inclination or no inclination relative to the area for connecting with the first pole. This enables the current to flow in a straight line direction parallel or approximately parallel to the width direction of the top cover assembly during the process of flowing from the area for connecting with the first tab to the area for connecting with the first pole. Thus, compared with the oblique flow (the direction inclined to the width direction of the top cover assembly) in the related art, the current flow direction parallel or approximately parallel to the width direction of the top cover assembly in this embodiment can shorten the current flow path to the greatest extent, reduce the along - the - way loss of electric energy and the manufacturing cost, and improve the energy efficiency of the battery.

[0010] In addition, since the first connecting piece needs to be connected to both the first pole and the first tab of the electrode assembly. Therefore, eccentrically setting the center line of the first pole and the center line of the first connecting piece in the length direction of the top cover assembly can, on the basis of ensuring the connection area and connection strength between the first pole and the first connecting piece, enable the area for connecting with the first pole and the area for welding with the first tab in the first connecting piece to be distributed as much as possible on the left and right sides of the first connecting piece and arranged in a staggered manner, so as to avoid the problem that when welding the first connecting piece and the first tab, due to the too long length of the first tab, the area that needs to be connected to the first pole in the first connecting piece is blocked, resulting in difficulty in connecting the first connecting piece and the first pole, which is beneficial to avoiding battery failure. In addition, the eccentric setting can also meet the spacing between the first pole and other poles, as well as the spacing between the first tab and other tabs, and avoid interference between each tab and the lower plastic.

[0011] In addition, by arranging at least one rib adjacent to the first connecting piece, at least one rib can also be used for anti-misassembly of the first pole and the first connecting piece, thereby improving the assembly efficiency and assembly accuracy of the top cover assembly.

[0012] In a possible implementation manner, the at least one rib includes a first rib and a second rib, and the dimensions of the first rib and the second rib in the width direction of the lower plastic are different;

[0013] The first rib and the second rib are both fixedly connected to the surface of the lower plastic body facing the first connecting piece, and are located on opposite sides of the first through hole in the length direction of the lower plastic. The first rib and the second rib both extend in the width direction of the lower plastic, and are opposite and spaced apart in the length direction of the lower plastic. In the length direction of the lower plastic, the first connecting piece is located between the first rib and the second rib, and the distance between the first rib and the first through hole is different from the distance between the second rib and the first through hole.

[0014] In a possible implementation manner, in the length direction of the lower plastic, the distance between the first rib and the first side of the first connecting piece is 0.5 mm - 9 mm;

[0015] In the length direction of the lower plastic, the distance between the second rib and the second side of the first connecting piece is 0.5 mm - 9 mm.

[0016] In a possible implementation manner, the top cover assembly further includes a first heat insulation sheet, the first heat insulation sheet is located between the lower plastic body and the first connecting piece, the first heat insulation sheet is provided with a first through hole, a first avoidance hole and a second avoidance hole, the first through hole, the first avoidance hole and the second avoidance hole all penetrate through the first heat insulation sheet along the thickness direction of the first heat insulation sheet, the first through hole is penetrated by the first pole, the first avoidance hole is penetrated by the first rib, the size of the first avoidance hole is adapted to the size of the first rib, the second avoidance hole is penetrated by the second rib, and the size of the second avoidance hole is adapted to the size of the second rib;

[0017] The projection of the first connecting piece on the lower plastic in the thickness direction of the top cover assembly falls within the projection range of the first heat insulation sheet on the lower plastic in the thickness direction of the top cover assembly.

[0018] In a possible implementation manner, the top cover assembly further includes a first heat insulation sheet, the first heat insulation sheet is located between the lower plastic body and the first connecting piece, and is penetrated by the first rib and the second rib, and the projection of the first connecting piece on the lower plastic in the thickness direction of the top cover assembly falls within the projection of the first heat insulation sheet on the lower plastic in the thickness direction of the top cover assembly.

[0019] In a possible implementation manner, the at least one rib includes a first rib, a second rib, a third rib, a fourth rib and a fifth rib, and the first rib, the second rib, the third rib, the fourth rib and the fifth rib are all arranged around the first through hole;

[0020] Both the first rib and the second rib are located on one side of the lower plastic in the width direction, both the first rib and the second rib extend along the length direction of the lower plastic, and are opposite and spaced apart in the length direction of the lower plastic;

[0021] Both the third rib and the fourth rib are located on the other side of the lower plastic in the width direction, both the third rib and the fourth rib extend along the length direction of the lower plastic, and are opposite and spaced apart in the length direction of the lower plastic, the third rib is also opposite and spaced apart from the first rib in the width direction of the lower plastic, and the fourth rib is also opposite and spaced apart from the second rib in the width direction of the lower plastic;

[0022] The fifth rib extends along the width direction of the lower plastic, and in the width direction of the lower plastic, the first rib, the fifth rib and the third rib are arranged in sequence;

[0023] The first connecting piece is located in the gap area between the second rib, the fourth rib and the fifth rib, and abuts against the fifth rib.

[0024] In a possible implementation manner, the top cover assembly further includes two first heat insulation sheets;

[0025] One first heat insulation sheet is located between the lower plastic body and one first tab connecting portion, and is located on the side of the first rib and the second rib away from the first through hole, and the projection of one first tab connecting portion on the lower plastic in the thickness direction of the top cover assembly falls within the projection of one first heat insulation sheet on the lower plastic in the thickness direction of the top cover assembly;

[0026] Another of the first thermal insulation sheets is located between the lower plastic body and another of the first pole ear connecting portions, and is located on the side of the third rib and the fourth rib away from the first through hole, and a projection of another of the first pole ear connecting portions on the lower plastic along the thickness direction of the top cover assembly falls within the range of a projection of another of the first thermal insulation sheets on the lower plastic along the thickness direction of the top cover assembly.

[0027] In a possible implementation manner, in the first pole, a radius of a connection between the first pole and the first connecting piece is R1;

[0028] In the width direction of the lower plastic, a distance L5 between the first rib and the center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1+0.5mm)≤L5≤(R1+5mm);

[0029] In the width direction of the lower plastic, a distance L6 between the second convex rib and the center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1+0.5mm)≤L6≤(R1+5mm);

[0030] In the width direction of the lower plastic, a distance L7 between the third rib and a center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1+0.5mm)≤L7≤(R1+5mm);

[0031] In the width direction of the lower plastic, a distance L8 between the fourth rib and a center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1+0.5mm)≤L8≤(R1+5mm);

[0032] In the length direction of the lower plastic, a distance L9 between the fifth rib and the first edge of the first connecting piece is 0.5 mm-9 mm.

[0033] In a possible embodiment, the lower plastic also includes a retaining wall, which is arranged around the outer edge of the lower plastic body and protrudes relative to the surface of the lower plastic body toward the first connecting piece. The retaining wall and the lower plastic body are arranged to form a receiving groove, and the first thermal insulation sheet, part of the first pole and part of the first connecting piece are all located in the receiving groove.

[0034] In a possible implementation, the lower plastic also includes a first boss and a second boss. Both the first boss and the second boss are fixedly connected to the lower plastic body and protrude from the surface of the lower plastic body facing the first connecting piece. The first boss and the second boss are respectively located at two ends of the lower plastic body in the length direction and are connected to the retaining wall. At least one first recess is provided on one side of the first boss facing the first connecting piece, and at least one second recess is provided on one side of the second boss facing the first connecting piece. At least one of the first recesses and at least one of the second recesses are both used to avoid the electrode assembly.

[0035] In a possible implementation, on the surface of each first tab connecting portion facing the electrode assembly, it is recessed towards the top cover relative to the surface of the first pole connecting portion facing the electrode assembly. A part of the first pole is located in the gap area between the first pole connecting portion and the lower plastic and is welded to the first pole connecting portion.

[0036] In a possible implementation, the lower plastic includes a first side surface, which is the end surface at one end of the lower plastic in the length direction. The first pole connecting portion includes a first side and a second side. The first side and the second side are oppositely arranged in the length direction of the top cover assembly, and the first side is closer to the first side surface than the second side.

[0037] The first connecting piece further includes an array of indentations. The array of indentations is provided on the surface of the first pole connecting portion facing away from the lower plastic. The minimum distance along the length direction of the top cover assembly between the array of indentations and the first side is less than the minimum distance along the length direction of the top cover assembly between the array of indentations and the second side. The projection of the first pole on the first connecting piece in the thickness direction of the top cover assembly falls within the area enclosed by the array of indentations on the first connecting piece.

[0038] In a possible implementation, the weld mark of the first pole connecting portion is a solid weld mark.

[0039] In a possible implementation, the top cover assembly further includes a second pole. The second pole is an integral structure and includes a second column body, a second base, and a second connecting piece.

[0040] The second column body passes through the lower plastic and is spaced from the first pole in the length direction of the top cover assembly.

[0041] The second base is coaxially arranged with the second column body and is connected between the second column body and the second connecting piece.

[0042] The second connecting piece is stacked with the lower plastic and extends linearly along the width direction of the top cover assembly. The second connecting piece includes two second tab connecting parts, and the two second tab connecting parts are respectively located on both sides of the second base. The two second tab connecting parts are used for welding connection with the second tab of the electrode assembly, so that the second connecting piece is electrically connected to the electrode assembly.

[0043] In a possible implementation manner, the center line of the second connecting piece in the length direction of the top cover assembly is offset relative to the center line of the second column;

[0044] The distance between the center line of the first pole column and the center line of the second column is greater than the distance between the center line of the first connecting piece in the length direction of the top cover assembly and the center line of the second connecting piece in the length direction of the top cover assembly.

[0045] In a possible implementation manner, the second pole column is a solid structure, or the second pole column is provided with a cavity, and the opening of the cavity is located on the surface of the second connecting piece away from the second column. The cavity extends from the second connecting piece through the second base to the second column.

[0046] In a second aspect, the present application further provides a battery, which includes an electrode assembly, a housing, and the top cover assembly as described above. The top cover assembly is connected to the housing and encloses a receiving space with the housing, and the electrode assembly is located in the receiving space.

[0047] In a third aspect, the present application further provides an electrical device, which includes the battery as described above. Description of the Drawings

[0048] Figure 1 is a schematic structural diagram of an energy storage system provided by an embodiment of the present application;

[0049] Figure 2 is a schematic structural diagram of a battery provided by an embodiment of the present application;

[0050] Figure 3 is a schematic structural diagram of a top cover assembly provided by a first embodiment of the present application;

[0051] Figure 4 is Figure 3 the exploded structural diagram of the top cover assembly shown;

[0052] Figure 5 is Figure 3 a schematic structural diagram of one angle of the top cover of the top cover assembly shown;

[0053] Figure 6 isFigure 3 A schematic structural diagram of the top cover of the top cover assembly shown in FIG. 1 from another angle;

[0054] Figure 7 is along Figure 3 A schematic cross-sectional view of a partial structure obtained by cutting along the cutting line AA shown;

[0055] Figure 8 yes Figure 3 A schematic structural diagram of the lower plastic of the top cover assembly at an angle shown;

[0056] Figure 9 yes Figure 3 A schematic structural diagram of the lower plastic of the top cover assembly from another angle;

[0057] Figure 10 is along Figure 3 A schematic cross-sectional view of another partial structure obtained by cutting along the cutting line AA shown;

[0058] Figure 11 yes Figure 3 A schematic structural diagram of an angle of a first pole of the top cover assembly shown;

[0059] Figure 12 yes Figure 3 The schematic diagram of the structure of the first upper plastic of the top cover assembly at an angle is shown;

[0060] Figure 13 yes Figure 3 A schematic structural diagram of the first upper plastic of the top cover assembly from another angle;

[0061] Figure 14 yes Figure 3 A schematic structural diagram of a first pressure ring of the top cover assembly at an angle shown;

[0062] Figure 15 yes Figure 3 A schematic structural diagram of a first sealing ring of the top cover assembly at an angle shown;

[0063] Figure 16 yes Figure 3 A schematic structural diagram of the top cover assembly from another angle shown;

[0064] Figure 17 yes Figure 16 A schematic structural diagram of a first connecting piece of the top cover assembly shown;

[0065] Figure 18 is along Figure 3 A schematic cross-sectional view of another partial structure obtained by cutting along the cutting line BB shown;

[0066] Figure 19 yesFigure 17 A structural schematic diagram of the first connecting piece shown;

[0067] Figure 20 yes Figure 16 A schematic structural diagram of the first thermal insulation sheet shown;

[0068] Figure 21 is along Figure 3 A schematic cross-sectional view of another partial structure obtained by cutting along the cutting line AA shown;

[0069] Figure 22 yes Figure 3 A schematic structural diagram of an angle of a second pole of the top cover assembly shown;

[0070] Figure 23 is along Figure 3 A schematic cross-sectional view of another partial structure obtained by cutting along the cutting line CC shown;

[0071] Figure 24 yes Figure 16 A schematic structural diagram of a second thermal insulation sheet shown;

[0072] Figure 25 yes Figure 3 A schematic structural diagram of an angle of the second upper plastic of the top cover assembly shown;

[0073] Figure 26 yes Figure 3 A schematic structural diagram of the second upper plastic of the top cover assembly from another angle;

[0074] Figure 27 yes Figure 3 A schematic structural diagram of an angle of the second pressure ring of the top cover assembly shown;

[0075] Figure 28 yes Figure 3 A schematic structural diagram of a second sealing ring of the top cover assembly at an angle shown;

[0076] Figure 29a is a structural schematic diagram of a top cover assembly provided in a second embodiment of the present application at an angle;

[0077] Figure 29b is a structural schematic diagram of the top cover assembly 100 provided in the second embodiment of the present application from another angle;

[0078] Figure 29c yes Figure 29b An enlarged schematic diagram of region F is shown;

[0079] Figure 30 is a schematic diagram of the structure of the lower plastic of the top cover assembly shown in FIG. 29;

[0080] Figure 31 It is a schematic structural diagram of the second pole column of the top cover assembly shown in Figure 29.

[0081] Reference numerals:

[0082] 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, top cover 10, first upper plastic 21, second upper plastic 22, lower plastic 30, first pole column 41, second pole column 42, first connecting piece 50, first sealing ring 61, second sealing ring 62, first pressing ring 71, second pressing ring 72, first limiting body 73, second limiting body 74, explosion-proof valve assembly 80, first surface 101, second surface 102, first hole 103, second hole 104, first installation groove 105, second installation groove 106, first limiting hole 107, second limiting hole 108, explosion-proof hole 11, installation table 12, groove 13, positioning hole 14, explosion-proof valve 81, explosion-proof valve protection piece 82, lower plastic body 31, third surface 311, fourth surface 312, first through hole 313, second through hole 314, positioning column 315, first thinning groove 316, second thinning groove 317, rib 32, first rib 32a, second rib 32b, third rib 32c, fourth rib 32d, retaining wall 33, receiving groove Q, first boss 34, second boss 35, first side surface 318, second side surface 319, first column body 411, first base 412, first sub-column 4111, second sub-column 4112, first upper plastic body 211, first convex part 212, third through hole 213, third installation groove 2111, first guiding inclined surface 2121, second gap W2, fourth through hole 711, third limiting hole 712, first sub-part 611, second sub-part 612, first pole column connecting part 51, first pole ear connecting part 52, first front surface 521, first back surface 522, first side 511, second side 512, array of indentations 53, weld mark T1 of first pole column connecting part 51, weld mark T2 of first pole ear connecting part 52, first heat insulation piece 91, first through hole 911, first avoiding hole 912, second avoiding hole 913, second column body 421, second base 422, second connecting piece 423, third sub-column 4211, fourth sub-column 4212, third gap W3, second pole ear connecting part 4231, second heat insulation piece 92, second through hole 921, third avoiding hole 922, fourth avoiding hole 923, second upper plastic body 221, second convex part 222, fifth through hole 223, fourth installation groove 2211, second guiding inclined surface 2221, fourth gap W4, sixth through hole 721, fourth limiting hole 722, third sub-part 621, fourth sub-part 622, fifth rib 32i, sixth rib 32j, seventh rib 32k, eighth rib 32l, ninth rib 32m, tenth rib 32n, first concave part 341, second concave part 351, cavity 424, distance H1 between first pole column connecting part 51 and lower plastic 30 in the thickness direction of top cover assembly 100, distance H2 between first pole ear connecting part 52 and lower plastic 30 in the thickness direction of top cover assembly 100The minimum distance S1 between the array of indentations 53 and the first side 511 along the length direction of the top cover assembly 100, the minimum distance S2 between the array of indentations 53 and the second side 512 along the length direction of the top cover assembly 100, the center line O1 of the first connecting piece 50 in the X direction, the center line O2 of the first pole 41, the center line O3 of the second connecting piece 423 in the X direction, the center line O4 of the second cylinder 421, the flange 425, the distance L1 between the first rib and the first connecting piece, the distance L2 between the second rib and the first connecting piece, the distance L3 between the third rib and the second connecting piece, the distance L4 between the fourth rib and the second connecting piece, the distance L5 between the first rib and the center line of the first through hole in the lower plastic in the length direction, the distance L6 between the second rib and the center line of the first through hole in the lower plastic in the length direction, the distance L7 between the third rib and the center line of the first through hole in the lower plastic in the length direction, the distance L8 between the fourth rib and the center line of the first through hole in the lower plastic in the length direction, the distance L9 between the fifth rib and the first connecting piece, the distance L10 between the sixth rib and the center line of the second through hole in the lower plastic in the length direction, the distance L11 between the seventh rib and the center line of the second through hole in the lower plastic in the length direction, the distance L12 between the eighth rib and the center line of the second through hole in the lower plastic in the length direction, the distance L13 between the ninth rib and the center line of the second through hole in the lower plastic in the length direction, the distance L14 between the tenth rib and the second connecting piece. Detailed Embodiment

[0083] For ease of understanding, the terms related to the embodiments of the present application will be explained first.

[0084] And / or: It is merely 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.

[0085] Multiple: It means two or more than two.

[0086] Connection: It should be understood in a broad sense. For example, the connection between A and B can be that A is directly connected to B, or A is indirectly connected to B through an intermediate medium.

[0087] Next, the specific embodiments of the present application will be clearly described in conjunction with the accompanying drawings.

[0088] The embodiments of the present application provide a top cover assembly, a battery, and an electrical device.

[0089] 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. During peak electricity consumption, there is not enough electricity, and during off-peak electricity consumption, there is too much electricity. 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 "power bank". When photovoltaics and wind energy are sufficient, electrical energy is stored, and the stored electrical energy is released when needed.

[0090] Taking electrochemical energy storage as an example, an embodiment of the present application provides an electrical device. A set of chemical batteries are provided inside the electrical device. It mainly uses the chemical elements in the chemical batteries as the energy storage medium. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage medium. 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.

[0091] 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:

[0092] 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.

[0093] The small and medium-sized energy storage cabinets applied to the industrial and commercial energy storage scenario on the user side and the household small energy storage boxes applied to the household energy storage scenario on the user side mainly operate in the mode of "peak shaving and valley filling". Since there is a large price difference in electricity bills 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 bills. In addition, in remote areas and areas with high incidence of natural disasters such as earthquakes and hurricanes, the presence of household electrical equipment is equivalent to users providing a backup power source for themselves and the grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0094] 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 take the household energy storage scenario in the user-side energy storage as an example for illustration, and the electrical equipment 300 of the present application is not limited to the household energy storage scenario.

[0095] 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 electrical energy during the low electricity price period, and the electrical equipment 300 is used to store the electrical 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 / blacked out.

[0096] 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 a plurality of batteries 200, the plurality of batteries 200 are electrically connected and are all located inside the housing of the electrical equipment 300, and can be protected by the housing from external environmental interference. Exemplarily, the plurality of batteries 200 are arranged at intervals. The plurality of batteries 200 can be connected in series, or in parallel, or in a series and parallel hybrid connection to achieve a larger capacity and power. The embodiments of the present application take the electrical equipment 300 including batteries as an example for illustration, but it should be understood that the electrical equipment 300 is not limited thereto.

[0097] 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.

[0098] The battery 200 may include a top cover assembly 100, a housing 210, and an electrode assembly 220. The top cover assembly 100 is connected to the housing 210 and encloses a receiving space with the housing 210, and the electrode assembly 220 is located in the receiving space. Exemplarily, the top cover assembly 100 can be welded to the housing 210 by welding. The housing 210 can be made of a metal material, such as aluminum alloy, etc. The battery 200 can be a cylindrical battery or a square battery, etc.

[0099] Among them, the electrode assembly 220 may include at least two electrode cores (not shown in the figure). The at least two electrode cores are arranged in sequence along the thickness direction of the battery 200. The setting of multiple electrode cores can increase the capacity of the battery 200, so that the battery 200 can be used for a long time, and further increase the applicable scenarios of the battery 200. Each electrode core may include a wound core, a first tab and a second tab. Both the first tab and the second tab are connected to the wound core. The polarities of the first tab and the second tab are opposite, one is the positive tab and the other is the negative tab.

[0100] In a specific application scenario, the number of electrode cores may be four. The four electrode cores are grouped in pairs to form two cell groups. The two cell groups are arranged along the thickness direction of the battery 200. In each cell group, the first tab of one electrode core is connected to the first tab of another electrode core, and the second tab of one electrode core is connected to the second tab of another electrode core, so as to form the first tab and the second tab of the cell group. In the two cell groups, all the first tabs can be welded to the first connecting piece 50 of the top cover assembly 100, and all the second tabs can be welded to the second connecting piece 423 of the top cover assembly 100, so as to realize the extraction of the same-sex electrodes of the four electrode cores.

[0101] Exemplarily, in the same electrode core, all layers of the first tab can be connected together by ultrasonic welding, and all layers of the second tab can be connected together by ultrasonic welding. In the same cell group, the first tabs of all electrode cores can be connected together by ultrasonic welding to form the first tab of the cell group. The second tabs of all electrode cores can be connected together by ultrasonic welding to form the second tab of the cell group. Between each cell group and the first connecting piece 50 and between each cell group and the second connecting piece 423, the first tab of each cell group can be connected to the first connecting piece 50 by laser welding, and the second tab of each cell group can be connected to the second connecting piece 423 by laser welding. In summary, the first tab and the second tab can be pre-welded by ultrasonic first, and then laser welded to the first connecting piece 50 and the second connecting piece 423 respectively, which is beneficial to avoid the problem of low welding yield caused by ultrasonic welding, improve the welding yield, and increase the reliability of the connection of each component in the top cover assembly 100.

[0102] It should be noted that Figure 2 the purpose is only to schematically describe the connection relationship between the top cover assembly 100, the housing 210 and the electrode assembly 220, and does not specifically limit the connection positions, specific structures and quantities of each component. And the structure schematically shown in the embodiments of the present application does not specifically limit the battery 200. In other embodiments of the present application, the battery 200 may include more or fewer components than Figure 2 shown, or combine some components, or split some components, or have different component arrangements. Figure 2The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0103] The structure of the top cover assembly 100 provided by the embodiments of the present application will be described in detail below through two embodiments.

[0104] First Embodiment:

[0105] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural diagram of the top cover assembly 100 provided by the first embodiment of the present application, Figure 4 is Figure 3 a schematic exploded structural diagram of the top cover assembly 100 shown.

[0106] For ease of description below, the length direction of the top cover assembly 100 is defined as the X direction, the width direction of the top cover assembly 100 is defined as the Y direction, and the thickness direction of the top cover assembly 100 is defined as the Z direction. The X direction, Y direction, and Z direction are perpendicular to each other in pairs.

[0107] In this embodiment, the top cover assembly 100 may include a top cover 10, a first upper plastic 21, a second upper plastic 22, a lower plastic 30, a first pole 41, a second pole 42, a first connecting piece 50, a first sealing ring 61, a second sealing ring 62, a first pressing ring 71, a second pressing ring 72, a first limiting body 73, a second limiting body 74, and an explosion-proof valve assembly 80.

[0108] The first upper plastic 21, the second upper plastic 22, and the lower plastic 30 are all installed on the top cover 10. The first upper plastic 21 and the second upper plastic 22 are on the same side of the top cover 10 and are also respectively on both sides of the length direction (illustrated as the X direction) of the top cover 10. The lower plastic 30 is on the other side of the top cover 10 away from the first upper plastic 21 and away from the second upper plastic 22. The lower plastic 30 protrudes from the two surfaces opposite to each other in the thickness direction of the top cover 10 with respect to the first upper plastic 21 and the lower plastic 30 with respect to the second upper plastic 22 respectively.

[0109] The first terminal post 41 is installed on the top cover 10, the first upper plastic 21 and the lower plastic 30, and is insulated from the top cover 10 through the first upper plastic 21, the lower plastic 30, and the first sealing ring 61. The second terminal post 42 is installed on the top cover 10, the second upper plastic 22 and the lower plastic 30, and is insulated from the top cover 10 through the second upper plastic 22, the second sealing ring 62 and the lower plastic 30. The first terminal post 41 and the second terminal post 42 can also be used as the electrode leads of the battery 200 to achieve the electrical connection between the battery 200 and external devices. Among them, the first terminal post 41 can be one of the positive terminal post and the negative terminal post, and the second terminal post 42 can be the other of the positive terminal post and the negative terminal post. Hereinafter, the case where the first terminal post 41 is the negative terminal post and the second terminal post 42 is the positive terminal post will be taken as an example to illustrate the structure of the terminal post, but it should be understood that this is not limiting.

[0110] The first connecting piece 50 is connected to the first terminal post 41 and is also welded to all the first pole tabs of the electrode assembly 220 to achieve the electrical connection between the first terminal post 41 and the electrode assembly 220. The second terminal post 42 may include a second connecting piece 423. The second connecting piece 423 is welded to all the second pole tabs of the electrode assembly 220 to achieve the electrical connection between the second terminal post 42 and the electrode assembly 220.

[0111] The first sealing ring 61 is sleeved on the outside of the first terminal post 41 and is located between the lower plastic 30 and the first terminal post 41, and between the top cover 10 and the first terminal post 41. The first sealing ring 61 can be used to seal the gap between the top cover 10 and the first terminal post 41 to prevent the electrolyte from invading here, which may cause the reduction of the insulation between the top cover 10 and the first terminal post 41 and the safety of the electrode assembly 220. The second sealing ring 62 is sleeved on the outside of the second terminal post 42 and is located between the lower plastic 30 and the second terminal post 42, and between the top cover 10 and the second terminal post 42. The second sealing ring 62 can be used to seal the gap between the top cover 10 and the second terminal post 42 to prevent the electrolyte from invading here, which may cause the reduction of the insulation between the top cover 10 and the second terminal post 42 and the safety of the battery cell.

[0112] The first pressing ring 71 is installed on the first upper plastic 21, sleeved on the outside of the first terminal post 41, and is electrically connected to the first terminal post 41. The second pressing ring 72 is installed on the second upper plastic 22, sleeved on the outside of the second terminal post 42, and is electrically connected to the second terminal post 42.

[0113] The first limiting body 73 is inserted through the first upper plastic 21 and is located between the first pressing ring 71 and the top cover 10. The second limiting body 74 is inserted through the second upper plastic 22 and is located between the second pressing ring 72 and the top cover 10. Among them, the number of the first limiting bodies 73 can be multiple. Multiple first limiting bodies 73 are inserted through the first upper plastic 21 at intervals and are located between the top cover 10 and the first pressing ring 71. The number of the second limiting bodies 74 can be multiple. Multiple second limiting bodies 74 are inserted through the second upper plastic 22 at intervals and are located between the top cover 10 and the second pressing ring 72.

[0114] 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.

[0115] The following will describe in detail the structures of the components in the top cover assembly 100 and the assembly relationships between the components with reference to the drawings.

[0116] Please refer to Figure 5 , Figure 5 which is Figure 3 a schematic structural view of the top cover 10 of the top cover assembly 100 shown at an angle.

[0117] The top cover 10 may include a first surface 101 and a second surface 102. The second surface 102 and the first surface 101 are arranged opposite to each other in the thickness direction (the illustrated Z direction) of the top cover 10. Among them, the first surface 101 may face away from the electrode assembly 220, and the second surface 102 may face the electrode assembly 220.

[0118] The top cover 10 may be provided with a first hole 103 and a second hole 104. The first hole 103 and the second hole 104 may be arranged at intervals in the length direction of the top cover 10. The first hole 103 and the second hole 104 may both penetrate the top cover 10 along the thickness direction of the top cover 10. That is, the first hole 103 and the second hole 104 may both penetrate the first surface 101 and the second surface 102.

[0119] The top cover 10 may be provided with a first installation groove 105 and a second installation groove 106. The first installation groove 105 and the second installation groove 106 may be spaced apart in the length direction of the top cover 10. The openings of the first installation groove 105 and the second installation groove 106 may both be located on the first surface 101. The first installation groove 105 may be recessed from the first surface 101 into the interior of the top cover 10 and is coaxially arranged with the first hole 103. The cross-sectional width of the first installation groove 105 in the thickness direction of the top cover 10 may be greater than the cross-sectional width of the first hole 103 in the thickness direction of the top cover 10. The second installation groove 106 may be recessed from the second surface 102 into the interior of the top cover 10 and is coaxially arranged with the second hole 104. The cross-sectional width of the second installation groove 106 in the thickness direction of the top cover 10 may be greater than the cross-sectional width of the second hole 104 in the thickness direction of the top cover 10. Wherein, the first installation groove 105 and the second installation groove 106 may both be blind grooves.

[0120] The top cover 10 may be provided with a first limiting hole 107 and a second limiting hole 108. The opening of the first limiting hole 107 may be located on the bottom wall of the first installation groove 105. Wherein, the bottom wall of the first installation groove 105 and the opening of the first installation groove 105 are oppositely arranged in the thickness direction of the top cover 10. The first limiting hole 107 may be recessed from the bottom wall of the first installation groove 105 into the interior of the top cover 10. The first limiting hole 107 may be located at the outer edge of the first hole 103. The opening of the second limiting hole 108 may be located on the bottom wall of the second installation groove 106. Wherein, the bottom wall of the second installation groove 106 and the opening of the second installation groove 106 are oppositely arranged in the thickness direction of the top cover 10. The second limiting hole 108 may be recessed from the bottom wall of the second installation groove 106 into the interior of the top cover 10. The second limiting hole 108 may be located at the outer edge of the second hole 104.

[0121] Wherein, both the first limiting hole 107 and the second limiting hole 108 are blind holes. The number of the first limiting holes 107 may be multiple. The structures of the multiple first limiting holes 107 may be similar, the same or different. The multiple first limiting holes 107 may be spaced apart on the bottom wall of the first installation groove 105. The number of the second limiting holes 108 may be multiple. The structures of the multiple second limiting holes 108 may be similar, the same or different. The multiple second limiting holes 108 may be spaced apart on the bottom wall of the second installation groove 106. Further, the multiple first limiting holes 107 may also be spaced apart along the circumferential direction of the first hole 103. The multiple second limiting holes 108 may also be spaced apart along the circumferential direction of the second hole 104. Exemplarily, the number of the first limiting holes 107 may be three. The three first limiting holes 107 may be spaced apart on the bottom wall of the first installation groove 105. The number of the second limiting holes 108 may be three. The three second limiting holes 108 may be spaced apart on the bottom wall of the second installation groove 106.

[0122] Please refer to Figure 5 and Figure 6 , Figure 6 yes Figure 3 The schematic structural diagram of the top cover 10 of the top cover assembly 100 is shown at another angle.

[0123] The top cover 10 may be provided with explosion-proof holes 11. The explosion-proof holes 11 may penetrate the top cover 10 along the thickness direction of the top cover 10, and are also located between the first installation groove 105 and the second installation groove 106.

[0124] The top cover 10 may be provided with a mounting platform 12 and a groove 13. The mounting platform 12 may be provided on the first surface 101 and protrude in a direction away from the top cover 10 relative to the first surface 101. The mounting platform 12 may also be provided around the outer edge of the explosion-proof hole 11. The opening of the groove 13 may be located on the second surface 102. The groove 13 may be formed by being recessed from the second surface 102 toward the inside of the top cover 10. The groove 13 may be coaxially provided and connected with the explosion-proof hole 11. The cross-sectional width of the groove 13 along the thickness direction of the top cover 10 may be greater than the cross-sectional width of the explosion-proof hole 11 along the thickness direction of the top cover 10.

[0125] The top cover 10 may be provided with a positioning hole 14. The opening of the positioning hole 14 may be located on the second surface 102. The positioning hole 14 may be formed by being recessed from the second surface 102 to the inside of the top cover 10. The positioning hole 14 may be a blind hole. There may be multiple positioning holes 14. The structures of the multiple positioning holes 14 may be similar, identical or different. The multiple positioning holes 14 may be arranged at intervals on the top cover 10. Exemplarily, the number of the positioning holes 14 may be four. The four positioning holes 14 are respectively arranged at the four corners of the top cover 10.

[0126] See also Figure 7 , Figure 7 is along Figure 3 The cross-sectional schematic diagram of a partial structure obtained by cutting along the cutting line AA shown.

[0127] 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 13 of the top cover 10 and cover the opening of the explosion-proof hole 11 located on the second surface 102 of the top cover 10. The explosion-proof valve protection sheet 82 may be connected to the mounting platform 12 of the top cover 10 and cover the opening of the explosion-proof hole 11 located on the first surface 101 of the top cover 10. The explosion-proof valve protection sheet 82 may also cover the explosion-proof valve 81.

[0128] Combined with reference Figure 3 and Figure 8 , Figure 8 yes Figure 3Schematic structural diagram of the lower plastic 30 of the top cover assembly 100 shown at a certain angle.

[0129] The lower plastic 30 can be stacked with the top cover 10. The lower plastic 30 can include a first side surface 318 and a second side surface 319. The first side surface 318 and the second side surface 319 can be oppositely arranged in the length direction of the lower plastic 30. That is, the first side surface 318 is the end face at one end of the length direction of the lower plastic 30, and the second side surface 319 is the end face at the other end of the length direction of the lower plastic 30.

[0130] The lower plastic 30 can include a lower plastic body 31. The lower plastic body 31 is located on one side in the thickness direction of the top cover 10 and is fixedly connected to the top cover 10 to achieve the fixed connection between the lower plastic 30 and the top cover 10. The lower plastic body 31 can include a third surface 311 and a fourth surface 312. The fourth surface 312 can be arranged opposite to the third surface 311 in the thickness direction (illustrated Z direction) of the lower plastic 30. Among them, the third surface 311 can face the top cover 10, and the fourth surface 312 can face the electrode assembly 220.

[0131] The lower plastic body 31 can be provided with a first through hole 313 and a second through hole 314. The first through hole 313 and the second through hole 314 can be oppositely and spaced apart in the length direction (illustrated X direction) of the lower plastic 30 and both penetrate the lower plastic body 31 in the thickness direction of the lower plastic 30. That is, the first through hole 313 and the second through hole 314 can both penetrate the third surface 311 and the fourth surface 312. Among them, the first through hole 313 can be communicated with the first hole 103 of the top cover 10, and the second through hole 314 can be communicated with the second hole 104 of the top cover 10.

[0132] The lower plastic body 31 can be provided with positioning columns 315. The positioning columns 315 can be arranged on the third surface 311 and protrude in the direction towards the top cover 10 relative to the third surface 311. The positioning columns 315 can be installed in the positioning holes 14 of the top cover 10 to achieve the fixed connection between the lower plastic 30 and the top cover 10. Among them, the shape of the positioning columns 315 can be adapted to the shape of the positioning holes 14 of the top cover 10. The number of the positioning columns 315 can be multiple. The structures of the multiple positioning columns 315 can be similar, the same or different. The multiple positioning columns 315 can be spaced apart on the lower plastic body 31. Exemplarily, the number of the positioning columns 315 can be four. The four positioning columns 315 are respectively arranged at the four corners of the lower plastic body 31. Each positioning column 315 is installed in a positioning hole 14 of the top cover 10.

[0133] Please refer to Figure 8 and Figure 9 , Figure 9 is Figure 3 schematic structural diagram of the lower plastic 30 of the top cover assembly 100 shown at another angle.

[0134] The lower plastic body 31 may be provided with a first thinning groove 316 and a second thinning groove 317. The first thinning groove 316 and the second thinning groove 317 may be spaced apart in the length direction of the lower plastic 30. The openings of the first thinning groove 316 and the second thinning groove 317 may both be located on the fourth surface 312. The first thinning groove 316 and the second thinning groove 317 may both be recessed from the fourth surface 312 into the interior of the lower plastic 30. The first thinning groove 316 may be coaxially arranged and communicated with the first through hole 313. The cross-sectional width of the first thinning groove 316 in the thickness direction of the lower plastic 30 may be greater than the cross-sectional width of the first through hole 313 in the thickness direction of the lower plastic 30. The second thinning groove 317 may be coaxially arranged and communicated with the second through hole 314. The cross-sectional width of the second thinning groove 317 in the thickness direction of the lower plastic 30 may be greater than the cross-sectional width of the second through hole 314 in the thickness direction of the lower plastic 30.

[0135] It can be understood that by providing the first thinning groove 316 and the second thinning groove 317, on the basis of ensuring the strength of the lower plastic 30, the thickness of the lower plastic 30 can be thinned and the weight can be reduced, which is beneficial to the miniaturization and lightness of the top cover assembly 100.

[0136] The distance between the bottom wall of the first thinning groove 316 and the third surface 311, and / or, the distance between the bottom wall of the second thinning groove 317 and the third surface 311 may be in the range of 0.1 mm - 0.7 mm (including the end values 0.1 mm and 0.7 mm).

[0137] Wherein, the bottom wall of the first thinning groove 316 may be oppositely arranged to the opening of the first thinning groove 316 in the thickness direction of the lower plastic 30. The bottom wall of the second thinning groove 317 may be oppositely arranged to the opening of the second thinning groove 317 in the thickness direction of the lower plastic 30. Exemplarily, the distance between the bottom wall of the first thinning groove 316 and the third surface 311, and the distance between the bottom wall of the second thinning groove 317 and the third surface 311 may both be 0.3 mm.

[0138] It can be understood that if the distance between the bottom wall of each thinning groove and the third surface 311 is set to be less than 0.1 mm, the lower plastic 30 will not have the Z-direction bearing capacity at the positions where each thinning groove is provided, which easily leads to the failure of the top cover assembly 100. Moreover, it will also increase the manufacturing difficulty of the lower plastic 30. If the distance between the bottom wall of each thinning groove and the third surface 311 is set to be greater than 0.7 mm, the step wall of the lower plastic 30 will be too thin, resulting in a significant decrease in the sealing performance between the lower plastic 30 and each sealing ring during assembly. Therefore, setting the distance between the bottom wall of each thinning groove and the third surface 311 between 0.1 mm and 0.7 mm can fully avoid the aforementioned problems and improve the working reliability of the top cover assembly 100.

[0139] Please refer to Figure 9 , the lower plastic 30 may further include at least one rib 32. The at least one rib 32 is fixedly connected to the fourth surface 312 of the lower plastic body 31, protrudes toward the electrode assembly 220 relative to the fourth surface 312 of the lower plastic body 31, and is disposed close to the first through hole 313.

[0140] Specifically, the at least one rib 32 may include a first rib 32a and a second rib 32b. Both the first rib 32a and the second rib 32b are fixedly connected to the fourth surface 312 of the lower plastic body 31, protrude toward the electrode assembly 220 relative to the fourth surface 312 of the lower plastic body 31, and are both located at the outer edge of the first through hole 313. The first rib 32a and the second rib 32b may both extend along the width direction (the illustrated Y direction) of the lower plastic 30, and are opposite and spaced apart in the length direction of the lower plastic 30. The first rib 32a and the second rib 32b may be located on opposite sides of the first through hole 313 in the length direction of the lower plastic 30. In the length direction of the lower plastic 30, the distance between the center line of the first rib 32a and the first through hole 313 is different from the distance between the center line of the second rib 32b and the second through hole 314. That is, in the length direction of the lower plastic 30, the distance between the first rib 32a and the first through hole 313 is different from the distance between the second rib 32b and the first through hole 313. The length of the first rib 32a may be different from the length of the second rib 32b. That is, the dimension of the first rib 32a along the width direction of the lower plastic 30 is not equal to the dimension of the second rib 32b along the width direction of the lower plastic 30.

[0141] Exemplarily, in the length direction of the lower plastic 30, the distance between the center line of the first rib 32a and the first through hole 313 is less than the distance between the center line of the second rib 32b and the second through hole 314. That is, in the length direction of the lower plastic 30, the distance between the first rib 32a and the first through hole 313 is less than the distance between the second rib 32b and the first through hole 313, and the first rib 32a is closer to the first through hole 313 than the second rib 32b. The length of the first rib 32a may be less than the length of the second rib 32b. That is, the dimension of the first rib 32a in the width direction of the lower plastic 30 is less than the dimension of the second rib 32b in the width direction of the lower plastic 30. Of course, in other embodiments, the length of the first rib 32a may also be greater than the length of the second rib 32b or the same as the length of the second rib 32b, and this is not strictly limited.

[0142] The lower plastic 30 may further include a third rib 32c and a fourth rib 32d. Both the third rib 32c and the fourth rib 32d are fixedly connected to the fourth surface 312 of the lower plastic body 31, and both protrude from the fourth surface 312 of the lower plastic body 31 toward the electrode assembly 220, and are both located at the outer edge of the second through hole 314. The third rib 32c and the fourth rib 32d may both extend in the width direction (the illustrated Y direction) of the lower plastic 30, and are opposite and spaced apart in the length direction of the lower plastic 30. The third rib 32c may be symmetrically arranged with the first rib 32a, and the fourth rib 32d may be symmetrically arranged with the second rib 32b. The third rib 32c and the fourth rib 32d may be located on opposite sides of the second through hole 314 in the length direction of the lower plastic 30. In the length direction of the lower plastic 30, the distance between the center line of the third rib 32c and the second through hole 314 is different from the distance between the center line of the fourth rib 32d and the second through hole 314. That is, in the length direction of the lower plastic 30, the distance between the third rib 32c and the second through hole 314 is different from the distance between the fourth rib 32d and the second through hole 314. The length of the third rib 32c may be different from the length of the fourth rib 32d. That is, the dimension of the third rib 32c in the width direction of the lower plastic 30 is not equal to the dimension of the fourth rib 32d in the width direction of the lower plastic 30.

[0143] Exemplarily, in the length direction of the lower plastic 30, the distance between the center line of the third rib 32c and the second through hole 314 is less than the distance between the center line of the fourth rib 32d and the second through hole 314. That is, in the length direction of the lower plastic 30, the distance between the third rib 32c and the second through hole 314 is less than the distance between the fourth rib 32d and the second through hole 314, and the third rib 32c is closer to the second through hole 314 than the fourth rib 32d. The length of the third rib 32c can be less than the length of the fourth rib 32d. That is, the dimension of the third rib 32c in the width direction of the lower plastic 30 is less than the dimension of the fourth rib 32d in the width direction of the lower plastic 30. Of course, in other embodiments, the length of the third rib 32c can also be greater than the length of the fourth rib 32d, or the same as the length of the fourth rib 32d, and this is not strictly limited.

[0144] Please continue to refer to Figure 9 , the lower plastic 30 may further include a retaining wall 33. The retaining wall 33 may be disposed around the outer edge of the lower plastic body 31 and protrude relative to the fourth surface 312 of the lower plastic body 31. The retaining wall 33 and the lower plastic body 31 may enclose a receiving groove Q. At least part of the first rib 32a, at least part of the second rib 32b, at least part of the third rib 32c, and at least part of the fourth rib 32d may all be located in the receiving groove Q.

[0145] The lower plastic 30 may further include a first boss 34 and a second boss 35. The first boss 34 and the second boss 35 may both be fixedly connected to the lower plastic body 31 and protrude relative to the fourth surface 312 of the lower plastic body 31. The first boss 34 and the second boss 35 may be respectively located at both ends of the lower plastic body 31 in the length direction and are both connected to the retaining wall 33. The protruding height of the first boss 34 relative to the fourth surface 312 of the lower plastic body 31 and the protruding height of the second boss 35 relative to the fourth surface 312 of the lower plastic body 31 may be the same and are both greater than the protruding height of the retaining wall 33 relative to the lower plastic body 31. The first boss 34 and the second boss 35 may be used to abut against the electrode assembly 220.

[0146] It can be understood that by providing the first boss 34 and the second boss 35 on the lower plastic body 31, the distance between the electrode assembly 220 and the lower plastic body 31, and the distance between the electrode assembly 220 and the top cover 10 can be increased. Furthermore, when the electrode assembly 220 is out of thermal control, the probability that the electric spark in the electrode assembly 220 splashes outside the battery 200 through the explosion-proof hole 11 can be reduced, and the safety performance of the battery 200 can be improved.

[0147] The connected lower plastic body 31, retaining wall 33 and first boss 34 may jointly form a first side surface 318 of the lower plastic 30. The connected lower plastic body 31, retaining wall 33 and second boss 35 may jointly form a second side surface 319 of the lower plastic 30. In some other embodiments, the first side surface 318 and the second side surface 319 may also be independently formed by the lower plastic body 31, which is not strictly limited.

[0148] The above describes the structure of the top cover 10, the lower plastic 30 and the explosion-proof valve assembly 80. The following describes in detail the structure and assembly of the first pole 41 and the components near the first pole 41, such as the first upper plastic 21, the first pressure ring 71, the first sealing ring 61, the first connecting piece 50, etc.

[0149] Please refer to Figure 10 and Figure 11 , Figure 10 is along Figure 3 The cross-sectional schematic diagram of another partial structure obtained by cutting along the cutting line AA shown in FIG. Figure 11 yes Figure 3 The structure diagram of the first pole 41 of the top cover assembly 100 is shown at an angle.

[0150] The first pole 41 can be inserted through the top cover 10 and the lower plastic 30, and is arranged near the first side 318 of the lower plastic 30 relative to the second pole 42. Specifically, the first pole 41 can include a first column 411 and a first base 412. The first column 411 and the first base 412 can be coaxially arranged and connected. Exemplarily, the material of the first column 411 can be aluminum. The material of the first base 412 can be copper.

[0151] The first cylinder 411 can pass through the first hole 103 of the top cover 10 and the first through hole 313 of the lower plastic 30. A part of the first cylinder 411 can protrude in a direction away from the top cover 10 relative to the first surface 101 of the top cover 10. Specifically, the first cylinder 411 can include a first sub-cylinder 4111 and a second sub-cylinder 4112. The first sub-cylinder 4111 and the second sub-cylinder 4112 can be coaxially arranged and connected. The first sub-cylinder 4111 can be connected between the second sub-cylinder 4112 and the first base 412. That is, in the height direction of the first pole 41, the first base 412, the first sub-cylinder 4111, and the second sub-cylinder 4112 can be connected in sequence. The cross-sectional width of the first sub-cylinder 4111 in the height direction of the first pole 41 (the illustrated Z direction) can be greater than the cross-sectional width of the second sub-cylinder 4112 in the height direction of the first pole 41 and less than the cross-sectional width of the first base 412 in the height direction of the first pole 41. That is, the projection of the first cylinder 411 in the height direction of the first pole 41 can entirely fall on the first base 412. The first sub-cylinder 4111 can be located in the first hole 103 of the top cover 10 and the first through hole 313 of the lower plastic 30. A part of the second sub-cylinder 4112 can be located in the first hole 103 of the top cover 10, and the remaining part of the second sub-cylinder 4112 can protrude relative to the first surface 101 of the top cover 10.

[0152] The first base 412 can be located on the side of the lower plastic 30 away from the top cover 10 (i.e., the side of the fourth surface 312 of the lower plastic 30), and a first gap W1 can be formed between the first base 412 and the lower plastic 30. The first gap W1 can be arranged around the first cylinder 411. That is, in the thickness direction of the top cover assembly 100 (the illustrated Z direction), the first gap W1 can be located between the top cover 10 and the lower plastic 30 and surround the outside of the first cylinder 411. Among them, the projection of the first base 412 on the lower plastic 30 in the thickness direction of the top cover assembly 100 (the illustrated Z direction) can partially fall on the lower plastic 30. That is, in the thickness direction of the top cover assembly 100, there can be a certain overlapping area between the first base 412 and the lower plastic 30.

[0153] In the length direction of the top cover assembly 100, the first base 412 can also be located between the first rib 32a and the second rib 32b of the lower plastic 30. And, in the length direction of the top cover assembly 100, the distance between the first base 412 and the first rib 32a of the lower plastic 30 can be less than the distance between the first base 412 and the second rib 32b of the lower plastic 30. That is, the first base 412 can be arranged close to the first rib 32a and away from the second rib 32b, so that the whole first pole 41 is more biased towards the first rib 32a.

[0154] Please refer to Figure 10 、 Figure 12 and Figure 13, Figure 12 is Figure 3 A schematic structural view of a first upper plastic 21 of the top cover assembly 100 shown at an angle. Figure 13 is Figure 3 A schematic structural view of the first upper plastic 21 of the top cover assembly 100 shown at another angle.

[0155] The first upper plastic 21 can be sleeved on the first pole column 41 and is located between the top cover 10 and the first pole column 41. Specifically, the first upper plastic 21 can include a first upper plastic body 211 and a first convex portion 212. The first upper plastic body 211 can be coaxially arranged and connected with the first convex portion 212. The cross-sectional width of the first upper plastic body 211 in the thickness direction of the first upper plastic 21 (the illustrated X direction) can be greater than the cross-sectional width of the first convex portion 212 in the thickness direction of the top cover 10.

[0156] The first upper plastic 21 can be provided with a third through hole 213. The third through hole 213 can penetrate the first upper plastic 21 in the thickness direction of the first upper plastic 21 (the illustrated Z direction). That is, the third through hole 213 can penetrate the first upper plastic body 211 and the first convex portion 212 in the thickness direction of the first upper plastic 21. Among them, part of the first sub-column 4111 and at least part of the second sub-column 4112 of the first pole column 41 can be located in the third through hole 213.

[0157] The first upper plastic body 211 can be installed in the first installation groove 105 of the top cover 10. Part of the first upper plastic body 211 is located in the first installation groove 105 of the top cover 10, and the remaining part of the first upper plastic body 211 protrudes from the first surface 101 of the top cover 10 in a direction away from the lower plastic 30. That is, the first upper plastic body 211 can be located on the side of the top cover 10 away from the lower plastic 30 and is also sleeved on the outside of the first column body 411 of the first pole column 41.

[0158] The first upper plastic body 211 can be provided with a third installation groove 2111. The opening of the third installation groove 2111 can be located on the surface of the first upper plastic body 211 facing away from the first convex portion 212. The third installation groove 2111 can be recessed from the surface of the first upper plastic body 211 facing away from the first convex portion 212 into the interior of the first upper plastic 21. The third installation groove 2111 can be coaxially arranged with the third through hole 213. The cross-sectional width of the third installation groove 2111 in the thickness direction of the first upper plastic 21 can be greater than the cross-sectional width of the third through hole 213 in the thickness direction of the top cover 10.

[0159] One end of the first protrusion 212 is fixedly connected to the first upper plastic body 211, and the other end of the first protrusion 212 extends in a direction away from the first upper plastic body 211. The first protrusion 212 can be located in the first hole 103 of the top cover 10, and is also arranged around the outer side of the first column 411 of the first pole 41. A first guide slope 2121 can be provided at one end of the first protrusion 212 away from the first upper plastic body 211. The first guide slope 2121 can form a part of the outer surface of the first protrusion 212, and is inclined from the top cover 10 to the direction of the first pole 41. A second gap W2 can be formed between the first guide slope 2121 and the inner wall of the first hole 103. Exemplarily, the first guide slope 2121 can be arranged around the end of the first protrusion 212 away from the first upper plastic body 211 along the circumferential direction of the first protrusion 212.

[0160] It can be understood that, by forming the first guiding slope 2121 at one end of the first protrusion 212 away from the first upper plastic body 211, when the first upper plastic 21 is assembled with the top cover 10, the guiding effect of the first guiding slope 2121 can be utilized to enable the first protrusion 212 to quickly slide into the first hole 103 of the top cover 10, thereby realizing rapid assembly between the first upper plastic 21 and the top cover 10, reducing the assembly time of the top cover assembly 100, and improving the assembly efficiency of the top cover assembly 100.

[0161] Please refer to Figure 10 and Figure 14 , Figure 14 yes Figure 3 The schematic diagram of the structure of the first pressure ring 71 of the top cover assembly 100 is shown at an angle.

[0162] The first pressing ring 71 can be installed in the third installation groove 2111 of the first upper plastic body 211, and sleeved on the outside of the first column 411 of the first pole 41, and electrically connected to the first pole 41. Part of the first pressing ring 71 can be located in the third installation groove 2111 of the first upper plastic body 211, and the remaining part of the first pressing ring 71 can be protruded in a direction away from the first protrusion 212 relative to the surface of the first upper plastic body 211 away from the first protrusion 212.

[0163] The first pressing ring 71 may be provided with a fourth through hole 711. The fourth through hole 711 may penetrate the first pressing ring 71 along the thickness direction (Z direction in the figure) of the first pressing ring 71. The first pressing ring 71 may surround the second sub-column 4112 of the first pole 41. That is, the second sub-column 4112 of the first pole 41 may be located in the fourth through hole 711.

[0164] The first pressing ring 71 may be provided with a third limiting hole 712. The opening of the third limiting hole 712 may be located on the surface of the first pressing ring 71 facing the first upper plastic 21. The third limiting hole 712 may be recessed from the surface of the first pressing ring 71 facing the first upper plastic 21 towards the inside of the first pressing ring 71. The third limiting hole 712 may be located at the outer edge of the fourth through hole 711. Among them, the third limiting hole 712 is a blind hole. The number of the third limiting holes 712 may be multiple. The structures of the multiple third limiting holes 712 may be similar, the same or different. The multiple third limiting holes 712 may be arranged at intervals on the surface of the first pressing ring 71 facing the first upper plastic 21. Further, the multiple third limiting holes 712 may also be arranged at intervals along the circumferential direction of the fourth through hole 711.

[0165] Exemplarily, the number of the third limiting holes 712 may be six. The six third limiting holes 712 may be arranged at intervals on the surface of the first pressing ring 71 facing the first upper plastic 21, and are located on the periphery of the fourth through hole 711, and are sequentially arranged along the circumferential direction of the fourth through hole 711.

[0166] Please refer to Figure 3 and Figure 4 , the first limiting body 73 may penetrate through the first upper plastic 21. One end of the first limiting body 73 is located in the first limiting hole 107 of the top cover 10, and the other end of the first limiting body 73 is located in the third limiting hole 712 of the top cover 10. The first limiting body 73 may be used to support the first pressing ring 71 and limit the circumferential rotation of the first pressing ring 71 relative to the first upper plastic 21. Exemplarily, the number of the first limiting bodies 73 may be six. The six first limiting bodies 73 may penetrate through the first upper plastic 21 and are arranged at intervals between the top cover 10 and the first pressing ring 71.

[0167] In this embodiment, the first sealing ring 61 may have good elastic deformation performance. It may undergo elastic deformation under pressure and rebound after the pressure is removed. The first sealing ring 61 may include a first state and a second state. When the first sealing ring 61 is in the first state, the first sealing ring 61 is separated from both the lower plastic 30 and the top cover 10. When the first sealing ring 61 is in the second state, the first sealing ring 61 is sleeved on the outer side of the first column body 411 of the first pole 41 and is located in the first gap W1 between the first hole 103 of the top cover 10, the first through hole 313 of the lower plastic 30 and the first base 412 of the lower plastic 30 and the first pole 41. That is, when the first sealing ring 61 is in the first state, the first sealing ring 61 is in an uncompressed natural state. When the first sealing ring 61 is in the second state, the first sealing ring 61 is in a compressed state under pressure. The following will be described by taking the first sealing ring 61 in the second state as an example, but it should be understood that this is not limited thereto.

[0168] Please refer to Figure 10, the first sealing ring 61 can be sleeved outside the first column body 411 of the first pole column 41 and is located in the first clearance W1 between the first hole 103 of the top cover 10, the first through hole 313 of the lower plastic 30 and the first base 412 of the lower plastic 30 and the first pole column 41. The first sealing ring 61 located in the first clearance W1 is in interference fit with the lower plastic 30 in the thickness direction (the illustrated Z direction) of the top cover assembly 100. Exemplarily, the interference amount of the first sealing ring 61 located in the first clearance W1 and the lower plastic 30 in the thickness direction of the top cover assembly 100 can be 0.1 mm.

[0169] It can be understood that in the related art, when the top cover assembly is assembled, the insulation resistance value between the first pole column and the top cover can be greater than 200 MΩ, which enables good insulation performance between the first pole column and the top cover. However, when the top cover assembly contacts the electrolyte, the electrolyte will invade the area where the first pole column of the top cover assembly is located. Due to error problems such as manufacturing tolerances of various components in the top cover assembly and assembly tolerances during assembly, a gap will be formed between the radial direction of the first sealing ring and the inner wall of the first through hole of the lower plastic. When there is electrolyte in this gap, it is easy to sharply reduce the insulation performance between the top cover and the first pole column, resulting in a reduction in the safety of the battery cell. Moreover, when there is an unsealed gap between the upper plastic and the first sealing ring, foreign matters such as intermediate metal chips or water vapor are likely to invade this gap, further reducing the insulation between the first pole column and the top cover.

[0170] Therefore, in the embodiments of the present application, by making part of the first sealing ring 61 located in the first clearance W1 between the lower plastic 30 and the first base 412 of the first pole column 41 in the thickness direction of the top cover assembly 100, and making the first sealing ring 61 located in the first clearance W1 be in interference fit with the lower plastic 30 in the thickness direction of the top cover assembly 100. It can enable the first sealing ring 61 to effectively seal the first clearance W1 between the lower plastic 30 and the top cover 10, block the flow path of the electrolyte from entering between the first pole column 41 and the top cover 10 through the first clearance W1, avoid the problem that the first pole column 41 and the top cover 10 are conducted due to contact with the electrolyte, resulting in a short circuit, and is beneficial to improving the safety performance of the battery cell.

[0171] Furthermore, the first thinning groove 316 of the lower plastic 30 can form part of the first clearance W1, and the first sealing ring 61 located in the first thinning groove 316 is in interference fit with the lower plastic 30.

[0172] It can be understood that if the first thinning groove 316 is not provided on the lower plastic 30, after the lower plastic 30 and the first sealing ring 61 are assembled, the first sealing ring 61 located in the first gap W1 will be thinner, which will reduce the sealing effect between the lower plastic 30 and the first pole 41 and increase the processing difficulty of the first sealing ring 61. In addition, since the thickness of the lower plastic 30 at the position where the first thinning groove 316 is located is thinner, therefore, setting part of the first sealing ring 61 in the first thinning groove 316 can provide a certain filling and deformation space for the first sealing ring 61, avoiding the reduction of the sealing effect between the lower plastic 30 and the first pole 41 due to the excessive rebound force of the first sealing ring 61. And, after being pressed, the first sealing ring 61 can extend along its radial direction to fully contact the lower plastic 30, thereby extending the sealing surface between the lower plastic 30 and the first sealing ring 61 and improving the sealing performance between the lower plastic 30 and the first pole 41.

[0173] Moreover, in the length direction (the illustrated X direction) of the top cover assembly 100, the overlapping length of the first sealing ring 61 and the lower plastic 30 can be greater than or equal to 0.2 mm. This enables the first sealing ring 61 and the lower plastic 30 to have sufficient contact area, so that the sealing surface between the first sealing ring 61 and the lower plastic 30 can be effectively extended.

[0174] Please continue to refer to Figure 10 , the first sealing ring 61 can be in contact with the inner wall of the first hole 103 of the top cover 10, the inner wall of the first through hole 313 of the lower plastic 30, the bottom wall of the first thinning groove 316 and a part of the second surface 102 of the top cover 10. The first sealing ring 61 located in the first hole 103 of the top cover 10 is in interference fit with the top cover 10 in the radial direction of the first sealing ring 61. The first sealing ring 61 located in the first through hole 313 of the lower plastic 30 is in interference fit with the lower plastic 30 in the radial direction of the first sealing ring 61. It can be understood that on the basis of forming a primary seal between the bottom of the first sealing ring 61 and the lower plastic 30, forming a secondary seal between the top of the first sealing ring 61 and the top cover 10 can enhance the sealing performance of the first sealing ring 61 and further prevent the electrolyte inside the battery cell or the water vapor outside the battery 200 from entering the gap between the top cover 10 and the first pole 41, resulting in the problem that the top cover 10 and the first pole 41 are electrically connected.

[0175] In this embodiment, the first sealing ring 61 located in the first hole 103 of the top cover 10 can be in contact with one end of the first convex portion 212 away from the first upper plastic body 211. It can be understood that by bringing the first sealing ring 61 into contact with the first upper plastic 21, the first sealing ring 61 can cooperate with the first upper plastic 21 to isolate the top cover 10 and the first pole 41, providing good insulation between the top cover 10 and the first pole 41, effectively avoiding the problem of short circuit caused by electrical conduction between the top cover 10 and the first pole 41, and having relatively good reliability.

[0176] Furthermore, the first sealing ring 61 located in the first hole 103 of the top cover 10 can be in interference fit with one end of the first convex portion 212 away from the first upper plastic body 211. Among them, the interference amount (i.e., interference distance) of the first sealing ring 61 and the first upper plastic 21 in the thickness direction of the top cover assembly 100 can be in the range of 0.1 mm - 0.3 mm (including the end point values 0.1 mm and 0.3 mm).

[0177] The first sealing ring 61 located in the first hole 103 of the top cover 10 can also be located in the second gap W2 between the first guiding inclined surface 2121 of the first upper plastic 21 and the inner wall of the first hole 103 of the top cover 10, and cover at least part of the first guiding inclined surface 2121. It can be understood that by making part of the first sealing ring 61 located in the second gap W2 and covering at least part of the first guiding inclined surface 2121, the first sealing ring 61 can surround the bottom of the first upper plastic 21 (i.e., the end of the first convex portion 212 away from the first upper plastic body 211), increasing the upward extrusion space of the first sealing ring 61 and the sealing height of the first sealing ring 61, enabling the first sealing ring 61 to surround the bottom of the first upper plastic 21 over a larger area, preventing metal chips from moving between the top cover 10 and the first pole 41, and improving the insulation performance between the top cover 10 and the first pole 41.

[0178] Please refer to Figure 10 and Figure 15 , Figure 15 is Figure 3 a schematic structural diagram of the first sealing ring 61 of the top cover assembly 100 shown at a certain angle.

[0179] The first sealing ring 61 may include a first sub - part 611 and a second sub - part 612. The first sub - part 611 may be sleeved on the outer side of the first column body 411 of the first pole column 41. The second sub - part 612 may be circumferentially connected to the periphery of the first sub - part 611 and is coaxially arranged with the first sub - part 611. The thickness of the second sub - part 612 (i.e., the dimension of the second sub - part 612 in the Z - direction) is less than the thickness of the first sub - part 611 (i.e., the dimension of the first sub - part 611 in the Z - direction), so that a stepped surface can be formed at the connection between the second sub - part 612 and the first sub - part 611. When the first sealing ring 61 is in the first state, the first sub - part 611 may be separated from the first pole column 41, the lower plastic 30, and the top cover 10, and the second sub - part 612 may be separated from the first pole column 41, the lower plastic 30, and the top cover 10. When the first sealing ring 61 is in the second state, the first sub - part 611 may be located in the first hole 103 of the top cover 10 and the first through - hole 313 of the lower plastic 30, and the second sub - part 612 may be located in the first gap W1 between the first through - hole 313 of the lower plastic 30 and the first base 412 of the lower plastic 30 and the first pole column 41. Among them, the second sub - part 612 located in the first gap W1 may be in interference fit with the top cover 10 in the thickness direction of the top - cover assembly 100.

[0180] It can be understood that by making the first sealing ring 61 include the first sub - part 611 and the second sub - part 612 with different thicknesses, when assembling the top - cover assembly 100, by using the step formed by the first sealing ring 61, the first sealing ring 61 can be quickly and fully deformed between the lower plastic 30 and the first pole column 41, and between the top cover 10 and the first pole column 41, filling the different - sized spaces between the lower plastic 30 and the first pole column 41, and between the top cover 10 and the first pole column 41, improving the assembly efficiency and sealing performance of the top - cover assembly 100.

[0181] Please refer to Figure 10 、 Figure 16 and Figure 17 , Figure 16 which is Figure 3 a schematic structural diagram of the top - cover assembly 100 from another angle as shown, Figure 17 and Figure 16 a schematic structural diagram of the first connecting piece 50 of the top - cover assembly 100 as shown.

[0182] The first connecting piece 50 may be located on a side of the lower plastic 30 away from the top cover 10, and is disposed near the first side surface 318 of the lower plastic 30 relative to the second connecting piece 423. The first connecting piece 50 may cover the first pole 41, and be physically and electrically connected to the first pole 41, and also be physically and electrically connected to the first pole tab of the electrode assembly 220, so that the first pole 41 and the electrode assembly 220 may be electrically connected through the first connecting piece 50. That is, the projection of the first pole 41 along the thickness direction of the top cover assembly 100 may all fall on the first connecting piece 50.

[0183] The first connecting piece 50 can be connected to the first pole 41 to form an integrated structure. For example, the first connecting piece 50 can be connected to the first pole 41 by means such as integral molding to form an integrated structure. Alternatively, the first connecting piece 50 can be separately provided with the first pole 41 and fixed together by means of assembly such as welding or bonding.

[0184] Furthermore, the first connecting piece 50 may extend straightly along the Y direction, and the center line O1 of the first connecting piece 50 in the X direction may be offset relative to the center line O2 of the first pole 41. That is, the center line O1 of the first connecting piece 50 in the X direction may be eccentrically disposed toward the second side surface 319 of the lower plastic 30 relative to the center line O2 of the first pole 41. That is, the center line O1 of the first connecting piece 50 in the X direction may be eccentrically disposed relative to the center line O2 of the first pole 41. The center line O1 of the first connecting piece 50 in the X direction and the center line O2 of the first pole 41 may have a certain eccentric distance in the X direction.

[0185] It is understandable that, since the first connecting piece 50 needs to be welded to the first pole 41 and the first pole ear of the electrode assembly 220, the center line O2 of the first pole 41 and the center line O1 of the first connecting piece 50 in the X direction are eccentrically arranged, so that the area welded to the first pole 41 and the area welded to the first pole ear in the first connecting piece 50 can be distributed as much as possible on both sides of the first connecting piece 50 and staggered on the basis of ensuring the connection area and connection strength between the first pole 41 and the first connecting piece 50, so as to avoid the problem that when welding the first connecting piece 50 and the first pole ear, the area to be welded to the first pole 41 in the first connecting piece 50 is blocked due to the excessive length of the first pole ear, making it difficult to weld the first connecting piece 50 and the first pole 41. In addition, the eccentric setting can also simultaneously meet the spacing between the first pole 41 and the second pole 42, as well as the spacing between the first pole ear and the second pole ear, to avoid interference between each pole ear and the lower plastic 30.

[0186] In addition, in the length direction of the top cover assembly 100, the first connecting piece 50 can also be located between the first rib 32a and the second rib 32b of the lower plastic 30. Among them, the first rib 32a of the lower plastic 30 can protrude relative to the surface of the first connecting piece 50 facing away from the first pole 41. That is, the first rib 32a of the lower plastic 30 can be higher than the surface of the first connecting piece 50 facing away from the first pole 41 to play an anti-misassembly role. The second rib 32b of the lower plastic 30 can protrude relative to the surface of the first connecting piece 50 facing away from the first pole 41. That is, the second rib 32b of the lower plastic 30 can be higher than the surface of the first connecting piece 50 facing away from the first pole 41 to play an anti-misassembly role.

[0187] It can be understood that since the distance between the first rib 32a of the lower plastic 30 and the first through hole 313 is different from the distance between the second rib 32b and the first through hole 313. Therefore, setting the first connecting piece 50 welded to the first pole 41 between the first rib 32a and the second rib 32b of the lower plastic 30 can make the first rib 32a and the second rib 32b be used for anti-misassembly of the first connecting piece 50, which is beneficial to improving the assembly accuracy and assembly precision of the top cover assembly 100.

[0188] Furthermore, the distance between the first rib 32a and the second rib 32b in the length direction of the lower plastic 30 can be smaller than the dimension of the first connecting piece 50 along the width direction of the lower plastic 30. Thus, the first rib 32a and the second rib 32b can cooperate to limit the rotation angle of the first connecting piece 50 around the central axis of the first pole 41, preventing the problem of the top cover assembly 100 failing due to excessive rotation of the first connecting piece 50.

[0189] In addition, in the length direction of the lower plastic 30, the distance L1 between the first rib 32a and the first connecting piece 50 (i.e., the distance between the first rib 32a and the first side 511 of the first connecting piece 50) can be 0.5 mm - 9 mm (including the end values 0.5 mm and 9 mm). In the length direction of the lower plastic 30, the distance L2 between the second rib 32b and the first connecting piece 50 (i.e., the distance between the second rib 32b and the second side 512 of the first connecting piece 50) can be 0.5 mm - 9 mm (including the end values 0.5 mm and 9 mm).

[0190] Hereinafter, the case where the first connecting piece 50 is welded to the first pole 41 will be taken as an example for illustration, but it should be understood that this is not limited thereto.

[0191] In this embodiment, the first connection piece 50 may include a first pole connection portion 51 and two first tab connection portions 52. The first pole connection portion 51 may cover the first base 412 of the first pole 41 and be welded to the first base 412 of the first pole 41, so that the first connection piece 50 is electrically connected to the first pole 41. The two first tab connection portions 52 are respectively fixedly connected to both sides of the first pole connection portion 51. One first tab connection portion 52, the first pole connection portion 51, and the other first tab connection portion 52 are sequentially connected in the width direction of the top cover assembly 100 and arranged in a straight line. That is, one first tab connection portion 52, the first pole connection portion 51, and the other first tab connection portion 52 are sequentially connected in the length direction (illustrated Y direction) of the first connection piece 50 and arranged in a straight line, that is, one first tab connection portion 52, the first pole connection portion 51, and the other first tab connection portion 52 are arranged along the same straight line direction in the length direction of the first connection piece 50. Among the two first tab connection portions 52, one first tab connection portion 52 is welded to the first tab of one battery cell group of the electrode assembly 220, and the other first tab connection portion 52 is welded to the first tab of the other battery cell group of the electrode assembly 220. This enables the first tabs of the two battery cell groups to be electrically connected to the first pole 41 through the first connection piece 50, and further enables the first connection piece 50 to be electrically connected to the electrode assembly 220. Among them, the center line of the first pole connection portion 51 in the X direction is coaxially arranged with the center line O1 of the first connection piece 50 in the X direction and is offset relative to the center line O2 of the first pole 41. Exemplarily, the welding method of the first pole connection portion 51 to the first pole 41 and the welding method of the first tab connection portion 52 to the first tab may both be laser welding.

[0192] It can be understood that in the top cover assembly of the related art, the connection piece has a pole connection area for connecting to the pole and a tab connection area for connecting to the tab. The pole connection area and the tab connection area are arranged in a staggered manner in the length direction of the top cover assembly, and have a small projection overlapping area or no projection overlapping area in the width direction of the top cover assembly. This causes the current to flow obliquely only along the inclined direction of the tab connection area relative to the pole connection area (i.e., the direction inclined to the width direction of the top cover assembly) during the process of flowing from the pole connection area to the tab connection area, and the current flow path is long, resulting in low energy efficiency of the battery.

[0193] In this embodiment, since the first pole connection portion 51 has a certain area connected to the first pole 41, each of the two first pole tab connection portions 52 has a certain area connected to the first pole tab. Therefore, when the first pole connection portion 51 is connected to the two first pole connection portions 51 and arranged in a straight line, the area connected to the first pole 41 and the area connected to the first pole tab in the first connecting piece 50 can be arranged in the same row or approximately in the same row along the width direction of the top cover assembly 100. That is, the area connected to the first pole 41 and the area connected to the first pole tab in the first connecting piece 50 can have a certain projected overlapping area in the width direction of the top cover assembly 100. That is, in the first connecting piece 50, the area connected to the first pole tab can have a smaller inclination or no inclination relative to the area connected to the first pole 41. This allows the current to flow in a straight line direction parallel or approximately parallel to the width direction of the top cover assembly 100 in the process of flowing from the area connected to the first pole ear to the area connected to the first pole 41. Therefore, compared with the oblique flow (the direction inclined to the width direction of the top cover assembly 100) in the related art, the current flow direction parallel or approximately parallel to the width direction of the top cover assembly 100 in this embodiment can shorten the current flow path to the greatest extent, reduce the loss of electric energy along the way and the preparation cost, and improve the energy efficiency of the battery 200.

[0194] Please refer to Figure 17 and Figure 18 , Figure 18 is along Figure 3 The cross-sectional schematic diagram of another partial structure obtained by cutting along the cutting line BB is shown.

[0195] Each first pole tab connection portion 52 may include a first front side 521 and a first back side 522. The first front side 521 and the first back side 522 may be disposed opposite to each other in the thickness direction of the first pole tab connection portion 52. The first front side 521 faces the lower plastic 30, and the first back side 522 faces the electrode assembly 220. The first pole column connection portion 51 may be recessed relative to the first front side 521 of the first pole tab connection portion 52, and protruded relative to the first back side 522 of the first pole tab connection portion 52.

[0196] In this embodiment, the first pole connection part 51 can be recessed relative to the two first ear connection parts 52 in the direction towards the electrode assembly 220. Specifically, the surface of each first ear connection part 52 facing the electrode assembly 220 is recessed in the direction towards the top cover 10 relative to the surface of the first pole connection part 51 facing the electrode assembly 220. The distance H1 between the first pole connection part 51 and the lower plastic 30 in the thickness direction of the top cover assembly 100 is greater than the distance H2 between the first ear connection part 52 and the lower plastic 30 in the thickness direction of the top cover assembly 100. The first base 412 of the first pole 41 is located in the gap area between the first pole connection part 51 and the lower plastic 30 and is welded to the first pole connection part 51.

[0197] It can be understood that by recessing the first pole connection part 51 relative to the two first ear connection parts 52 in the direction towards the electrode assembly 220, the first connection piece 50 can be made to have an uneven undulating shape as a whole. This enables a more obvious functional distinction between the first pole connection part 51 and the first ear connection part 52, thus playing a certain reminder role and effectively avoiding the problem of welding interference caused by unclear area division when the first connection piece 50 is welded to the first pole 41 and the first ear respectively. Moreover, it can also provide a larger connection area between the first pole 41 and the first connection piece 50, improving the current-carrying capacity between the first pole 41 and the first connection piece 50. In addition, since the two first ear connection parts 52 are both recessed in the direction towards the top cover 10 relative to the electrode assembly 220, the bending space of the first ear in the electrode assembly 220 can be increased.

[0198] In addition, compared with the related art where the connection piece is first welded to the ear and then to the pole. In this embodiment, the first connection piece 50 is first welded to the first pole 41 and then to the first ear. This ensures that even if the first ear is too long and covers the first pole 41, it does not affect the connection between the first connection piece 50 and the first pole 41, achieving high compatibility.

[0199] Please refer to Figure 16 、 Figure 17 and Figure 19 , Figure 19 is Figure 17 a schematic structural view of the first connection piece 50 shown in

[0200] The first pole connection part 51 may include a first side 511 and a second side 512. The first side 511 and the second side 512 may be oppositely arranged in the width direction (illustrated X direction) of the first connection piece 50, and the first side 511 and the second side 512 may also be oppositely arranged in the length direction of the top cover assembly 100. The first side 511 faces the first side surface 318 of the lower plastic 30 and is disposed close to the first side surface 318. The second side 512 faces the second side surface 319 of the lower plastic 30. In the X direction, the distance between the center line O2 of the first pole 41 and the first side 511 is different from the distance between the center line O2 of the first pole 41 and the second side 512.

[0201] Exemplarily, in the X direction, the distance between the center line O2 of the first pole 41 and the first side 511 may be less than the distance between the center line O2 of the first pole 41 and the second side 512. Thus, during the assembly process of the top cover assembly 100, the first side 511 with a shorter distance from the center line O2 of the first pole 41 can be oriented towards the first rib 32a with a shorter length, and the second side 512 with a longer distance from the center line O2 of the first pole 41 can be oriented towards the second rib 32b with a longer length for adaptive assembly. Such a setting can enable the first rib 32a and the second rib 32b with different lengths to play a certain visual reminder role during assembly, which is beneficial to avoiding the problem of assembly errors of the top cover assembly 100 caused by the first connection piece 50 rotating 180° during assembly, and improving the assembly accuracy and assembly efficiency of the top cover assembly 100.

[0202] The first connection piece 50 may further include an array of indentations 53. The array of indentations 53 may be provided on the surface of the first pole connection part 51 facing away from the lower plastic 30. The minimum distance S1 between the array of indentations 53 and the first side 511 in the length direction of the top cover assembly 100 may be less than the minimum distance S2 between the array of indentations 53 and the second side 512 in the length direction of the top cover assembly 100, so that the array of indentations 53 can be disposed more towards the first side 511 of the first pole connection part 51 as a whole and away from the second side 512 of the first pole connection part 51. Among them, the projection of the first pole 41 on the first connection piece 50 in the thickness direction of the top cover assembly 100 may fall within the area surrounded by the array of indentations 53 on the first connection piece 50.

[0203] On the one hand, the array of indentations 53 can play a positioning role, so that during the welding of the first pole connection part 51 to the first pole 41, the first pole connection part 51 and the first pole 41 can be quickly aligned, which is beneficial to improving the welding efficiency of the first pole connection part 51 and the first pole 41. On the other hand, the array of indentations 53 can improve the surface roughness of the first pole connection part 51, avoiding damage to the welding laser head due to specular reflection of the laser on the smooth surface of the first pole connection part 51 when the first pole 41 and the first pole connection part 51 are subjected to laser penetration welding. Instead, the laser can undergo diffuse reflection on the surface of the first pole connection part 51 and quickly absorb the laser energy, further improving the welding efficiency of the first pole connection part 51 and the first pole 41.

[0204] In a possible application scenario, please refer to Figure 19 , in Figure 19 , the circular area is the weld mark T1 of the first pole connection part 51, and the rectangular area is the weld mark T2 of the first tab connection part 52.

[0205] In the width direction (the illustrated Y direction) of the top cover assembly 100, the weld mark T2 of one first tab connection part 52, the weld mark T1 of the first pole connection part 51, and the weld mark T2 of the other first tab connection part 52 can be arranged in a column and spaced apart in sequence. Thus, when the current flows from the first tab connection part 52 to the first pole connection part 51, it can extend linearly along the width direction of the top cover assembly 100, which is beneficial to shortening the current flow path between the first tab connection part 52 and the first pole connection part 51 and improving the energy efficiency of the battery 200.

[0206] Among them, the weld mark T1 of the first pole connection part 51 can be a solid weld mark. It can be understood that by making the weld mark T1 of the first pole connection part 51 a solid weld mark, compared with the hollow weld ring in the related art, a larger welding area can be achieved between the first connecting piece 50 and the first pole 41, so that a more stable electrical connection can be established between the first connecting piece 50 and the first pole 41, and the overcurrent capacity between the two can be improved.

[0207] Please refer to Figure 10 , Figure 16 and Figure 20 , Figure 20 is Figure 16 the schematic structural diagram of the first heat insulation sheet 91 shown in

[0208] In this embodiment, the top cover assembly 100 may further include a first heat insulation sheet 91. The first heat insulation sheet 91 may be located between the lower plastic body 31 of the lower plastic 30 and the first connecting piece 50, and is penetrated by the first rib 32a and the second rib 32b of the lower plastic 30. That is, the first rib 32a and the second rib 32b of the lower plastic 30 may be disposed through the first heat insulation sheet 91. The first heat insulation sheet 91 may also be fixedly connected to the lower plastic 30. Wherein, the projection of the first connecting piece 50 on the lower plastic 30 in the thickness direction of the top cover assembly 100 falls within the range of the projection of the first heat insulation sheet 91 on the lower plastic 30 in the thickness direction of the top cover assembly 100, so as to ensure that the first heat insulation sheet 91 completely covers the first connecting piece 50. Exemplarily, the first heat insulation sheet 91 may be adhesively bonded on one side first and assembled with the lower plastic 30 first to improve the manufacturing efficiency of the top cover assembly 100.

[0209] Wherein, the first heat insulation sheet 91 may be made of any material with good insulation and resistance to electrolyte. Exemplarily, the material of the first heat insulation sheet 91 may be PET (Polyethylene Terephthalate), PP (Polypropylene), etc. The thickness of the first heat insulation sheet 91 may be in the range of 0.05 mm - 1.0 mm (including the end values 0.05 mm and 1.0 mm). Exemplarily, the thickness of the first heat insulation sheet 91 may be 0.4 mm.

[0210] It can be understood that since the first connecting piece 50 needs to be welded to the first pole column 41 assembled to the lower plastic 30 first and then welded to the first pole ear, and the first connecting piece 50 covers a part of the lower plastic body 31 of the lower plastic 30. Therefore, in order to avoid the problem that the lower plastic 30 melts due to the first connecting piece 50 scalding the lower plastic 30 at high temperature when welding the first connecting piece 50 to the first pole ear, adding a first heat insulation sheet 91 between the lower plastic 30 and the first connecting piece 50 can make the first heat insulation sheet 91 act as a spacer and play a good heat insulation role between the lower plastic 30 and the first connecting piece 50. And making the lengths of the first rib 32a and the second rib 32b of the lower plastic 30 different, and the first heat insulation sheet 91 is penetrated by the first rib 32a and the second rib 32b. On the one hand, it can effectively avoid interference between the first heat insulation sheet 91 and the first rib 32a, and between the first heat insulation sheet 91 and the second rib 32b, and enable the first heat insulation sheet 91, the first rib 32a, and the second rib 32b to each play their roles, with good working reliability. On the other hand, it can make the first rib 32a and the second rib 32b both match the opening length on the first heat insulation sheet 91, so as to achieve anti-fooling of the first heat insulation sheet 91 and realize efficient assembly.

[0211] In addition, if the thickness of the first heat insulation sheet 91 is less than 0.05 mm, it will cause the lower plastic 30 to be easily slightly scalded, thus having an adverse impact on the appearance performance and working reliability of the lower plastic 30. If the thickness of the first heat insulation sheet 91 is greater than 1.0 mm, it will excessively occupy the space in the height direction of the battery 200, resulting in a reduction in the capacity of the battery 200. By setting the first heat insulation sheet 91 within the range of 0.05 mm - 1.0 mm, the foregoing problems can be fully avoided, and the top cover assembly 100 can have a good service life.

[0212] Please refer to Figure 20 , the first heat insulation sheet 91 may be provided with a first through hole 911, a first avoidance hole 912, and a second avoidance hole 913. The first through hole 911, the first avoidance hole 912, and the second avoidance hole 913 may all penetrate the first heat insulation sheet 91 along the thickness direction of the first heat insulation sheet 91 (the illustrated Z direction). Among them, the first through hole 911 may communicate with the first avoidance hole 912 and be spaced apart from the second avoidance hole 913. The first through hole 911 may be used for the first pole 41 to pass through. The first avoidance hole 912 may be used for the first rib 32a of the lower plastic 30 to pass through, and the size of the first avoidance hole 912 may be adapted to the size of the first rib 32a. The second avoidance hole 913 may be used for the second rib 32b of the lower plastic 30 to pass through, and the size of the second avoidance hole 913 may be adapted to the size of the second rib 32b. Among them, the length of the first avoidance hole 912 may be different from the length of the second avoidance hole 913. That is, the dimension of the first avoidance hole 912 along the length direction of the first heat insulation sheet 91 (the illustrated Y direction) is not equal to the dimension of the second avoidance hole 913 along the length direction of the first heat insulation sheet 91.

[0213] Exemplarily, the length of the first avoidance hole 912 may be less than the length of the second avoidance hole 913. That is, the dimension of the first avoidance hole 912 along the length direction of the first heat insulation sheet 91 (the illustrated Y direction) is less than the dimension of the second avoidance hole 913 along the length direction of the first heat insulation sheet 91.

[0214] Please refer to Figure 18 , in this embodiment, the first heat insulation sheet 91, a part of the first pole 41, and a part of the first connection piece 50 are all located in the receiving groove Q of the lower plastic 30.

[0215] It is understandable that, since the lower plastic body 31 and the retaining wall 33 of the lower plastic 30 can be surrounded to form the receiving groove Q of the lower plastic 30. Therefore, the first heat insulating sheet 91, part of the first pole 41 and part of the first connecting sheet 50 are all accommodated in the receiving groove Q of the lower plastic 30, the retaining wall 33 at the periphery can be used to play a certain blocking and stopping role for the first heat insulating sheet 91, the first pole 41 and the first connecting sheet 50, so as to prevent the first heat insulating sheet 91, the first pole 41 and the first connecting sheet 50 from slipping off, thereby improving the connection strength of the top cover assembly 100. In addition, the receiving groove Q can protect the first pole ear and the second pole ear in the electrode assembly 220, and prevent the pole ears from directly rubbing against the top cover 10 during the manufacturing process.

[0216] The above describes the structure and assembly relationship of the first pole 41 and the components near the first pole 41 , and the following describes in detail the structure and assembly of the second pole 42 and the components near the second pole 42 such as the second upper plastic 22 , the second pressure ring 72 , the second sealing ring 62 .

[0217] Please refer to Figure 21 and Figure 22 , Figure 21 is along Figure 3 A schematic cross-sectional view of another partial structure obtained by cutting along the cutting line AA shown in FIG. Figure 22 yes Figure 3 The structure diagram of the second pole 42 of the top cover assembly 100 is shown at an angle.

[0218] In this embodiment, the second pole 42 can be passed through the top cover 10 and the lower plastic 30, and is arranged near the second side 319 of the lower plastic 30 relative to the first pole 41. Among them, the second pole 42 can be an integrated structure. That is, the various partial structures constituting the second pole 42 can be connected to form an integrated structure. The second pole 42 can also be a solid structure. Exemplarily, the material of the second pole 42 can be aluminum. The various partial structures constituting the second pole 42 can be an integrated structure formed by connecting by methods such as integral molding. In some other embodiments, the various partial structures constituting the second pole 42 can also be separately arranged and connected together by assembly methods such as welding and bonding.

[0219] Specifically, the second pole post 42 may include a second column body 421, a second base 422, and a second connecting piece 423. The second column body 421 and the second base 422 may be coaxially arranged and connected, and the second base 422 is connected between the second column body 421 and the second connecting piece 423. The second column body 421 may pass through the second hole 104 of the top cover 10 and the second through hole 314 of the lower plastic 30. A part of the second column body 421 may protrude in a direction away from the top cover 10 relative to the second surface 102 of the top cover 10. Specifically, the second column body 421 may include a third sub-column 4211 and a fourth sub-column 4212. The third sub-column 4211 and the fourth sub-column 4212 may be coaxially arranged and connected. The third sub-column 4211 may be connected between the fourth sub-column 4212 and the second base 422. That is, in the height direction of the second pole post 42, the second base 422, the third sub-column 4211, and the fourth sub-column 4212 may be connected in sequence. The cross-sectional width of the third sub-column 4211 along the height direction (the illustrated Z direction) of the second pole post 42 may be greater than the cross-sectional width of the fourth sub-column 4212 along the height direction of the second pole post 42 and less than the cross-sectional width of the second base 422 along the height direction of the second pole post 42. That is, the projection of the second column body 421 along the height direction of the second pole post 42 may entirely fall on the second base 422. The third sub-column 4211 may be located in the second hole 104 of the top cover 10 and the second through hole 314 of the lower plastic 30. A part of the fourth sub-column 4212 may be located in the second hole 104 of the top cover 10, and the remaining part of the fourth sub-column 4212 may protrude relative to the second surface 102 of the top cover 10.

[0220] The second base 422 may be located on a side of the lower plastic 30 away from the top cover 10 (i.e., on the side of the fourth surface 312 of the lower plastic 30), and a third gap W3 may be formed between the second base 422 and the lower plastic 30. The third gap W3 may be arranged to surround the second column body 421. That is, in the thickness direction (the illustrated Z direction) of the top cover assembly 100, the third gap W3 may be located between the top cover 10 and the lower plastic 30 and surround the outside of the second column body 421. Among them, the projection of the second base 422 on the lower plastic 30 along the thickness direction (the illustrated Z direction) of the top cover assembly 100 may partially fall on the lower plastic 30. That is, in the thickness direction of the top cover assembly 100, there may be a certain overlapping area between the second base 422 and the lower plastic 30.

[0221] Please refer to Figure 16 、 Figure 21 and Figure 22, the second connecting piece 423 can be located on the side of the lower plastic 30 away from the top cover 10 (i.e., stacked with the lower plastic 30), and cover the second base 422 and the second cylinder 421. The second connecting piece 423 can also be physically and electrically connected to the second tab of the electrode assembly 220, so that the second pole 42 and the electrode assembly 220 can be electrically connected through the second connecting piece 423. That is, the projections of the second cylinder 421 and the second base 422 in the thickness direction of the top cover assembly 100 can all fall on the first connecting piece 50.

[0222] It can be understood that by making the second pole 42 an integral structure formed by connecting the second connecting piece 423, the second cylinder 421 and the second base 422, the second connecting piece 423 can be connected to the second cylinder 421 and the second base 422 during molding, so that the welding process of the connecting piece and the pole in the related art can be cancelled. This ensures that even if the second tab is too long to cover the second cylinder 421 and / or the second base 422, it does not affect the physical and electrical connection between the second connecting piece 423 and the second cylinder 421 and the second base 422, which is conducive to achieving high compatibility.

[0223] In this embodiment, the second connecting piece 423 can extend linearly along the Y direction. The center line O3 of the second connecting piece 423 in the X direction is offset relative to the center line O4 of the second cylinder 421. That is, the center line O3 of the second connecting piece 423 in the X direction can be eccentrically arranged relative to the center line O4 of the second cylinder 421 and the center line of the second base 422 toward the second side surface 319 of the lower plastic 30. That is to say, the center line O3 of the second connecting piece 423 in the X direction can be eccentrically arranged with both the center line O4 of the second cylinder 421 and the center line of the second base 422. The center line O3 of the second connecting piece 423 in the X direction and the center line O4 of the second cylinder 421 can have a certain eccentric distance in the X direction. The center line O3 of the second connecting piece 423 in the X direction and the center line of the second base 422 can have a certain eccentric distance in the X direction.

[0224] Wherein, the distance between the center line O2 of the first pole 41 and the center line O4 of the second cylinder 421 is greater than the distance between the center line O1 of the first connecting piece 50 in the X direction and the center line O3 of the second connecting piece 423 in the X direction. That is, the deviation direction of the first connecting piece 50 relative to the first pole 41 is opposite to the deviation direction of the second connecting piece 423 relative to the second pole 42, and these two deviation directions are arranged towards each other to simultaneously satisfy the spacing between the second cylinder 421 and the first cylinder 411, as well as the spacing between the second tab and the first tab, and avoid interference between each tab and the lower plastic 30.

[0225] It can be understood that since the second connecting piece 423 needs to be welded to the second tab of the electrode assembly 220. Therefore, by eccentrically setting the center line O4 of the second cylinder 421 and the center line O3 of the second connecting piece 423 in the X direction, and the center line of the second base 422 and the center line O3 of the second connecting piece 423 in the X direction, the area of the second connecting piece 423 welded to the second tab can be staggered from the second cylinder 421 and the second base 422 as much as possible, so as to avoid the problem of interfering with the second cylinder 421 and / or the second base 422 when welding the second connecting piece 423 to the second tab due to the too long length of the second tab. In addition, the eccentric setting can also satisfy the distance between the second cylinder 421 and the first cylinder 411, as well as the distance between the second tab and the first tab, avoiding interference between the tabs and the lower plastic 30.

[0226] In addition, in the length direction of the top cover assembly 100, the second connecting piece 423 can also be located between the third rib 32c and the fourth rib 32d of the lower plastic 30. Among them, the third rib 32c of the lower plastic 30 can protrude relative to the surface of the second connecting piece 423 facing away from the second cylinder 421. That is, the third rib 32c of the lower plastic 30 can protrude above the surface of the second connecting piece 423 facing away from the second cylinder 421 to play an anti-misassembly role. The fourth rib 32d of the lower plastic 30 can protrude relative to the surface of the second connecting piece 423 facing away from the second cylinder 421. That is, the fourth rib 32d of the lower plastic 30 can protrude above the surface of the second connecting piece 423 facing away from the second cylinder 421 to play an anti-misassembly role.

[0227] It can be understood that since the distance between the third rib 32c of the lower plastic 30 and the second through hole 314 is different from the distance between the fourth rib 32d and the second through hole 314. Therefore, by setting the second connecting piece 423 between the third rib 32c and the fourth rib 32d of the lower plastic 30, the third rib 32c and the fourth rib 32d can be used for anti-misassembly of the second connecting piece 423, which is beneficial to improving the assembly accuracy and assembly precision of the top cover assembly 100.

[0228] Furthermore, the distance between the third rib 32c and the fourth rib 32d in the length direction of the lower plastic 30 can be smaller than the dimension of the second connecting piece 423 in the width direction of the lower plastic 30. Thus, the third rib 32c and the fourth rib 32d can cooperate to limit the rotation angle of the second connecting piece 423 around the central axis of the second pole column 42, preventing the problem of the top cover assembly 100 failing due to excessive rotation of the first connecting piece 50.

[0229] In addition, in the length direction of the lower plastic 30, the distance L3 between the third rib 32c and the second connecting piece 423 (i.e., the distance between the third rib 32c and the third side of the second connecting piece 423) can be 0.5 mm - 9 mm (including the end values 0.5 mm and 9 mm). In the length direction of the lower plastic 30, the distance L4 between the fourth rib 32d and the second connecting piece 423 (i.e., the distance between the fourth rib 32d and the fourth side of the second connecting piece 423) can be 0.5 mm - 9 mm (including the end values 0.5 mm and 9 mm).

[0230] In this embodiment, the second connecting pieces 423 can be arranged in a straight line in the width direction of the top cover assembly 100. The second connecting piece 423 includes two second tab connecting portions 4231. The two second tab connecting portions 4231 are respectively located on both sides of the second base 422. Among the two second tab connecting portions 4231, one second tab connecting portion 4231 is welded to the second tab of one cell group of the electrode assembly 220, and the other second tab connecting portion 4231 is welded to the second tab of the other cell group of the electrode assembly 220. This enables the second tabs of the two cell groups to be electrically connected to the second pole 42 through the second connecting piece 423, and further enables the second connecting piece 423 to be electrically connected to the electrode assembly 220. Exemplarily, the welding method between the second tab connecting portion 4231 and the second tab can be laser welding.

[0231] It can be understood that in the top cover assembly of the related art, the connecting piece has a pole connecting area for connecting to the pole and a tab connecting area for connecting to the tab. The pole connecting area and the tab connecting area are arranged offset in the length direction of the top cover assembly, and have a small projection overlapping area or no projection overlapping area in the width direction of the top cover assembly. This causes the current to flow obliquely only along the inclined direction of the tab connecting area relative to the pole connecting area (i.e., the direction inclined to the width direction of the top cover assembly) during the process of flowing from the pole connecting area to the tab connecting area. The current flow path is long, resulting in low energy efficiency of the battery.

[0232] In this embodiment, since the second connecting piece 423 has a certain area connected to the second base 422 and a certain area connected to the second tab. Therefore, when the second connecting piece 423 is arranged in a straight line, the areas of the second connecting piece 423 connected to the second base 422 and the second tab can be arranged in the same column or approximately in the same column along the width direction of the top cover assembly 100. That is, the areas of the second connecting piece 423 connected to the second column 421 and the second tab can have a certain projection overlapping area in the width direction of the top cover assembly 100. That is, in the second connecting piece 423, the area connected to the second tab can have a smaller inclination or no inclination relative to the area connected to the second base 422. This enables the current to flow in a straight line direction parallel or approximately parallel to the width direction of the top cover assembly 100 during the process of flowing from the area connected to the second tab to the area connected to the second base 422. Thus, compared with the oblique direction (the direction inclined to the width direction of the top cover assembly 100) in the related art, the current flow direction parallel or approximately parallel to the width direction of the top cover assembly 100 in this embodiment can shorten the current flow path to the greatest extent, reduce the along - the - way loss of electric energy and the manufacturing cost, and improve the energy efficiency of the battery 200.

[0233] The second connecting piece 423 may include a third side and a fourth side. The third side and the fourth side may be oppositely arranged in the width direction (the illustrated X direction) of the second connecting piece 423, and the third side and the fourth side may also be oppositely arranged in the length direction of the top cover assembly 100. The third side faces the second side surface 319 of the lower plastic 30 and is disposed close to the second side surface 319. The fourth side faces the first side surface 318 of the lower plastic 30. In the X direction, the distance between the center line O4 of the second column 421 (i.e., the center line of the second base 422) and the third side is different from the distance between the center line O4 of the second column 421 and the fourth side.

[0234] Exemplarily, in the X direction, the distance between the center line O4 of the second column 421 and the third side may be less than the distance between the center line O4 of the second column 421 and the fourth side. Thus, during the assembly process of the top cover assembly 100, the third side with a shorter distance from the center line O4 of the second column 421 can be oriented towards the shorter third rib 32c, and the fourth side with a longer distance from the center line O4 of the second column 421 can be oriented towards the longer fourth rib 32d for adaptive assembly. Such a setting can enable the third rib 32c and the fourth rib 32d with different lengths to play a certain visual reminder role during assembly, which is beneficial to avoiding the problem of assembly errors of the top cover assembly 100 caused by the second connecting piece 423 rotating 180° during assembly, and improving the assembly accuracy and assembly efficiency of the top cover assembly 100.

[0235] Please refer to Figure 22 and Figure 23 , Figure 23 is along Figure 3 The cross-sectional schematic diagram of another partial structure obtained by cutting along the cutting line CC shown.

[0236] In this embodiment, in the width direction (Y direction in the figure) of the top cover assembly 100 , the distance between the second connecting piece 423 and the fourth surface 312 of the lower plastic 30 along the thickness direction of the top cover assembly 100 is the same everywhere.

[0237] It is understandable that, since the second connecting piece 423 is integrally formed with the other parts of the second pole 42, the second connecting piece 423 can be in a straight sheet shape. This allows the distance between each position of the second connecting piece 423 and the lower plastic 30 to remain unchanged, which is beneficial to reducing the thickness of the top cover assembly 100 and achieving a thin and light top cover assembly 100.

[0238] Please refer to Figure 16 , Figure 21 and Figure 24 , Figure 24 yes Figure 16 A schematic structural diagram of the second thermal insulation sheet 92 is shown.

[0239] In this embodiment, the top cover assembly 100 may further include a second heat insulating sheet 92. The second heat insulating sheet 92 may be located between the lower plastic body 31 of the lower plastic 30 and the second connecting sheet 423, and may be passed through by the third convex rib 32c of the lower plastic 30 and the fourth convex rib 32d of the lower plastic 30. That is, the third convex rib 32c of the lower plastic 30 and the fourth convex rib 32d of the lower plastic 30 may be passed through the second heat insulating sheet 92. The second heat insulating sheet 92 may also be fixedly connected to the lower plastic 30. The projection of the second connecting sheet 423 on the lower plastic 30 along the thickness direction of the top cover assembly 100 falls within the range of the projection of the second heat insulating sheet 92 on the lower plastic 30 along the thickness direction of the top cover assembly 100, so as to ensure that the second heat insulating sheet 92 completely covers the second connecting sheet 423. Exemplarily, the second heat insulating sheet 92 may be glued on one side first and assembled with the lower plastic 30 first, so as to improve the process efficiency of the top cover assembly 100.

[0240] The second thermal insulation sheet 92 may be any material having good insulation and resistance to electrolyte. For example, the material of the second thermal insulation sheet 92 may be PET (Polyethylene Terephthalate), PP (Polypropylene), etc. The thickness of the second thermal insulation sheet 92 may be in the range of 0.05 mm to 1.0 mm (including the endpoints 0.05 mm and 1.0 mm). For example, the thickness of the second thermal insulation sheet 92 may be 0.4 mm.

[0241] It can be understood that since the second connecting piece 423 needs to be welded to the second tab, and the second connecting piece 423 will cover a part of the lower plastic body 31 of the lower plastic 30. Therefore, to avoid the problem of the lower plastic 30 melting due to the second connecting piece 423 scalding the lower plastic 30 at high temperature during the welding of the second connecting piece 423 and the second tab, a second heat insulation sheet 92 is added between the lower plastic 30 and the second connecting piece 423, so that the second heat insulation sheet 92 can act as a spacer and play a good heat insulation role between the lower plastic 30 and the second connecting piece 423. And the lengths of the third rib 32c and the fourth rib 32d of the lower plastic 30 are different, and the second heat insulation sheet 92 is penetrated by the third rib 32c and the fourth rib 32d. On the one hand, it can effectively avoid interference between the second heat insulation sheet 92 and the third rib 32c, and between the second heat insulation sheet 92 and the fourth rib 32d, enabling the second heat insulation sheet 92, the third rib 32c, and the fourth rib 32d to each play their roles and have good working reliability. On the other hand, it can make the third rib 32c and the fourth rib 32d both match the opening length on the second heat insulation sheet 92, so as to achieve anti-fooling of the second heat insulation sheet 92 and realize efficient assembly.

[0242] In addition, if the thickness of the second heat insulation sheet 92 is less than 0.05 mm, it will cause the lower plastic 30 to be easily slightly scalded, thus having an adverse impact on the appearance performance and working reliability of the lower plastic 30. If the thickness of the second heat insulation sheet 92 is greater than 1.0 mm, it will occupy too much space in the height direction of the battery 200, resulting in a reduction in the capacity of the battery 200. And setting the second heat insulation sheet 92 within the range of 0.05 mm - 1.0 mm can fully avoid the above problems and enable the top cover assembly 100 to have a good service life.

[0243] Please refer to Figure 24, the second heat insulation sheet 92 may be provided with a second through hole 921, a third avoidance hole 922 and a fourth avoidance hole 923. The second through hole 921, the third avoidance hole 922 and the fourth avoidance hole 923 may all penetrate the second heat insulation sheet 92 along the thickness direction of the second heat insulation sheet 92 (the Z direction shown in the figure). Among them, the second through hole 921 may communicate with the third avoidance hole 922 and be spaced apart from the fourth avoidance hole 923. The second through hole 921 may be used for the second pole column 42 to pass through. The third avoidance hole 922 may be used for the third rib 32c of the lower plastic 30 to pass through, and the size of the third avoidance hole 922 may be adapted to the size of the third rib 32c. The fourth avoidance hole 923 may be used for the fourth rib 32d of the lower plastic 30 to pass through, and the size of the fourth avoidance hole 923 may be adapted to the size of the fourth rib 32d. Among them, the length of the third avoidance hole 922 may be different from the length of the fourth avoidance hole 923. That is, the dimension of the third avoidance hole 922 along the length direction of the second heat insulation sheet 92 (the Y direction shown in the figure) is not equal to the dimension of the fourth avoidance hole 923 along the length direction of the second heat insulation sheet 92.

[0244] Exemplarily, the length of the third avoidance hole 922 may be less than the length of the fourth avoidance hole 923. That is, the dimension of the third avoidance hole 922 along the length direction of the second heat insulation sheet 92 (the Y direction shown in the figure) is less than the dimension of the fourth avoidance hole 923 along the length direction of the second heat insulation sheet 92.

[0245] Please refer to Figure 23 , in this embodiment, the second heat insulation sheet 92, part of the second base 422 and part of the second connecting piece 423 are all located in the receiving groove Q of the lower plastic 30.

[0246] It can be understood that since the lower plastic body 31 and the retaining wall 33 of the lower plastic 30 can enclose to form the receiving groove Q of the lower plastic 30. Therefore, by accommodating the second heat insulation sheet 92, part of the second base 422 and part of the second connecting piece 423 in the receiving groove Q of the lower plastic 30, the retaining wall 33 on the periphery can play a certain blocking and positioning role on the second heat insulation sheet 92 and the second pole column 42, avoiding the second heat insulation sheet 92 and the second pole column 42 from slipping off and improving the connection strength of the top cover assembly 100. In addition, the receiving groove Q can protect the first pole ear and the second pole ear in the electrode assembly 220 and prevent the pole ears from directly rubbing against the top cover 10 during the manufacturing process.

[0247] Please refer to in combination Figure 21 , Figure 25 and Figure 26 , Figure 25 is Figure 3 a schematic structural diagram of the second upper plastic 22 of the top cover assembly 100 shown in Figure 26 is Figure 3Schematic structural diagram of the second upper plastic part 22 of the top cover assembly 100 shown from another angle.

[0248] The second upper plastic part 22 can be sleeved on the second pole column 42 and is located between the top cover 10 and the second pole column 42. Specifically, the second upper plastic part 22 can include a second upper plastic body 221 and a second convex part 222. The second upper plastic body 221 can be coaxially arranged and connected with the second convex part 222. The cross-sectional width of the second upper plastic body 221 in the thickness direction of the second upper plastic part 22 (the X direction shown in the figure) can be greater than the cross-sectional width of the second convex part 222 in the thickness direction of the top cover 10.

[0249] The second upper plastic part 22 can be provided with a fifth through hole 223. The fifth through hole 223 can penetrate the second upper plastic part 22 in the thickness direction of the second upper plastic part 22 (the Z direction shown in the figure). That is, the fifth through hole 223 can penetrate the second upper plastic body 221 and the second convex part 222 in the thickness direction of the second upper plastic part 22. Among them, part of the third sub-column 4211 and at least part of the fourth sub-column 4212 of the second pole column 42 can be located in the fifth through hole 223.

[0250] The second upper plastic body 221 can be installed in the second installation groove 106 of the top cover 10. Part of the second upper plastic body 221 is located in the second installation groove 106 of the top cover 10, and the rest of the second upper plastic body 221 protrudes from the first surface 101 of the top cover 10 in a direction away from the lower plastic part 30. That is, the second upper plastic body 221 can be located on the side of the top cover 10 away from the lower plastic part 30 and is also sleeved on the outside of the second column body 421 of the second pole column 42.

[0251] The second upper plastic body 221 can be provided with a fourth installation groove 2211. The opening of the fourth installation groove 2211 can be located on the surface of the second upper plastic body 221 facing away from the second convex part 222. The fourth installation groove 2211 can be recessed from the surface of the second upper plastic body 221 facing away from the second convex part 222 into the interior of the second upper plastic part 22. The fourth installation groove 2211 can be coaxially arranged with the fifth through hole 223. The cross-sectional width of the fourth installation groove 2211 in the thickness direction of the second upper plastic part 22 can be greater than the cross-sectional width of the fifth through hole 223 in the thickness direction of the top cover 10.

[0252] One end of the second protrusion 222 is fixedly connected to the second upper plastic body 221, and the other end of the second protrusion 222 extends in a direction away from the second upper plastic body 221. The second protrusion 222 can be located in the second hole 104 of the top cover 10, and is also arranged around the outer side of the second column 421 of the second pole 42. A second guide slope 2221 can be provided at one end of the second protrusion 222 away from the second upper plastic body 221. The second guide slope 2221 can form a part of the outer surface of the second protrusion 222, and is inclined from the top cover 10 to the direction of the second pole 42. A fourth gap W4 can be formed between the second guide slope 2221 and the inner wall of the second hole 104. Exemplarily, the second guide slope 2221 can be arranged around the end of the second protrusion 222 away from the second upper plastic body 221 along the circumferential direction of the second protrusion 222.

[0253] Please refer to Figure 21 and Figure 27 , Figure 27 yes Figure 3 The schematic diagram of the structure of the second pressure ring 72 of the top cover assembly 100 is shown at an angle.

[0254] The second pressing ring 72 can be installed in the fourth installation groove 2211 of the second upper plastic body 221, and sleeved on the outer side of the second column 421 of the second pole 42, and electrically connected to the second pole 42. Part of the second pressing ring 72 can be located in the fourth installation groove 2211 of the second upper plastic body 221, and the remaining part of the second pressing ring 72 can be protruded in a direction away from the second protrusion 222 relative to the surface of the second upper plastic body 221 away from the second protrusion 222.

[0255] The second pressing ring 72 may be provided with a sixth through hole 721. The sixth through hole 721 may penetrate the second pressing ring 72 along the thickness direction (Z direction in the figure) of the second pressing ring 72. The second pressing ring 72 may surround the fourth sub-column 4212 of the second pole 42. That is, the fourth sub-column 4212 of the second pole 42 may be located in the sixth through hole 721.

[0256] The second pressing ring 72 may be provided with a fourth limiting hole 722. The opening of the fourth limiting hole 722 may be located on the surface of the second pressing ring 72 facing the second upper plastic 22. The fourth limiting hole 722 may be formed by being recessed from the surface of the second pressing ring 72 facing the second upper plastic 22 to the inside of the second pressing ring 72. The fourth limiting hole 722 may be located at the outer edge of the sixth through hole 721. Among them, the fourth limiting hole 722 is a blind hole. The number of the fourth limiting holes 722 may be multiple. The structures of the multiple fourth limiting holes 722 may be similar, identical or different. The multiple fourth limiting holes 722 may be arranged at intervals on the surface of the second pressing ring 72 facing the second upper plastic 22. Furthermore, the multiple fourth limiting holes 722 may also be arranged at intervals along the circumferential direction of the sixth through hole 721.

[0257] Exemplarily, the number of the fourth limiting holes 722 may be six. The six fourth limiting holes 722 may be arranged at intervals on the surface of the second pressing ring 72 facing the second upper plastic 22, located on the periphery of the sixth through hole 721, and arranged in sequence along the circumferential direction of the sixth through hole 721.

[0258] Please refer to Figure 3 and Figure 4 , the second limiting body 74 may penetrate through the second upper plastic 22. One end of the second limiting body 74 is located in the second limiting hole 108 of the top cover 10, and the other end of the second limiting body 74 is located in the fourth limiting hole 722 of the top cover 10. The second limiting body 74 can be used to support the second pressing ring 72 and limit the circumferential rotation of the second pressing ring 72 relative to the second upper plastic 22. Exemplarily, the number of the second limiting bodies 74 may be six. The six second limiting bodies 74 may penetrate through the second upper plastic 22 and be arranged at intervals between the top cover 10 and the second pressing ring 72.

[0259] In this embodiment, the second sealing ring 62 may have good elastic deformation performance. It can undergo elastic deformation under pressure and rebound after the pressure is removed. The second sealing ring 62 may include a third state and a fourth state. When the second sealing ring 62 is in the third state, the second sealing ring 62 is separated from both the lower plastic 30 and the top cover 10. When the second sealing ring 62 is in the fourth state, the second sealing ring 62 is sleeved on the outer side of the second column body 421 of the second pole column 42 and is located in the third gap W3 between the second hole 104 of the top cover 10, the second through hole 314 of the lower plastic 30, and the first base 412 of the lower plastic 30 and the second pole column 42. That is, when the second sealing ring 62 is in the third state, the second sealing ring 62 is in an uncompressed natural state. When the second sealing ring 62 is in the fourth state, the second sealing ring 62 is in a compressed state under pressure. Hereinafter, the case where the second sealing ring 62 is in the fourth state will be taken as an example for description, but it should be understood that this is not limiting.

[0260] Please refer to Figure 21 , the second sealing ring 62 may be sleeved on the outer side of the second column body 421 of the second pole column 42 and is located in the third gap W3 between the second hole 104 of the top cover 10, the second through hole 314 of the lower plastic 30, and the second base 422 of the lower plastic 30 and the second pole column 42. The second sealing ring 62 located in the third gap W3 is in interference fit with the lower plastic 30 in the thickness direction (the illustrated Z direction) of the top cover assembly 100. Exemplarily, the interference amount of the second sealing ring 62 located in the third gap W3 and the lower plastic 30 in the thickness direction of the top cover assembly 100 may be 0.1 mm.

[0261] Further, the second thinning groove 317 of the lower plastic 30 can form a part of the third gap W3, and the second sealing ring 62 located in the second thinning groove 317 is in interference fit with the lower plastic 30.

[0262] In this embodiment, in the length direction (illustrated X direction) of the top cover assembly 100, the overlapping length of the second sealing ring 62 and the lower plastic 30 can be greater than or equal to 0.2 mm.

[0263] Please continue to refer to Figure 21 , the second sealing ring 62 can be in contact with the inner wall of the second hole 104 of the top cover 10, the inner wall of the second through hole 314 of the lower plastic 30, the bottom wall of the second thinning groove 317, and a part of the second surface 102 of the top cover 10. The second sealing ring 62 located in the second hole 104 of the top cover 10 is in interference fit with the top cover 10 in the radial direction of the second sealing ring 62. The second sealing ring 62 located in the second through hole 314 of the lower plastic 30 is in interference fit with the lower plastic 30 in the radial direction of the second sealing ring 62.

[0264] Among them, the second sealing ring 62 located in the second hole 104 of the top cover 10 can be in contact with one end of the second convex portion 222 away from the second upper plastic body 221. Further, the second sealing ring 62 located in the second hole 104 of the top cover 10 can be in interference fit with one end of the second convex portion 222 away from the second upper plastic body 221. The interference amount (i.e., the interference distance) of the second sealing ring 62 and the second upper plastic 22 in the thickness direction of the top cover assembly 100 can be in the range of 0.1 mm - 0.3 mm (including the end point values 0.1 mm and 0.3 mm).

[0265] The second sealing ring 62 located in the second hole 104 of the top cover 10 can also be located in the fourth gap W4 between the second guiding inclined surface 2221 of the second upper plastic 22 and the inner wall of the second hole 104 of the top cover 10, and cover at least a part of the second guiding inclined surface 2221.

[0266] Please refer to Figure 21 and Figure 28 , Figure 28 is Figure 3 a schematic structural view of the second sealing ring 62 of the top cover assembly 100 shown at an angle.

[0267] The second sealing ring 62 may include a third sub - part 621 and a fourth sub - part 622. The third sub - part 621 may be sleeved on the outer side of the second column body 421 of the second pole column 42. The fourth sub - part 622 may be circumferentially connected to the periphery of the third sub - part 621 and be coaxially arranged with the third sub - part 621. The thickness of the fourth sub - part 622 (i.e., the dimension of the fourth sub - part 622 along the Z - direction) is less than the thickness of the third sub - part 621 (i.e., the dimension of the third sub - part 621 along the Z - direction), so that a stepped surface can be formed at the connection between the fourth sub - part 622 and the third sub - part 621. When the second sealing ring 62 is in the third state, the third sub - part 621 may be separated from the second pole column 42, the lower plastic 30, and the top cover 10, and the fourth sub - part 622 may be separated from the second pole column 42, the lower plastic 30, and the top cover 10. When the second sealing ring 62 is in the fourth state, the third sub - part 621 may be located in the second hole 104 of the top cover 10 and the second through - hole 314 of the lower plastic 30, and the fourth sub - part 622 may be located in the third gap W3 between the second through - hole 314 of the lower plastic 30 and the second base 422 of the lower plastic 30 and the second pole column 42. Among them, the fourth sub - part 622 located in the third gap W3 may be in interference fit with the top cover 10 in the thickness direction of the top - cover assembly 100.

[0268] Second embodiment:

[0269] In this embodiment, the same content as the first embodiment will not be elaborated. Different from the first embodiment, the structures of the lower plastic 30, the first heat - insulating sheet 91, the second heat - insulating sheet 92, and the second pole column 42 are different, which will be specifically described in detail below. In addition, the descriptions of the structural improvements of the top - cover assembly 100 in this embodiment can be applied to the first embodiment above without conflict.

[0270] Lower plastic 30:

[0271] Please refer to Figure 29a 、 Figure 29b 、 Figure 29c and Figure 30 , Figure 29a which is a schematic structural diagram of the top - cover assembly 100 provided by the second embodiment of the present application from one angle, Figure 29b which is a schematic structural diagram of the top - cover assembly 100 provided by the second embodiment of the present application from another angle, Figure 29c is Figure 29b the enlarged schematic diagram of the F area shown in Figure 30 and is the structural diagram of the lower plastic 30 of the top - cover assembly 100 shown in FIG. 29.

[0272] The differences between the lower plastic 30 of this embodiment and the lower plastic 30 of the first embodiment will be described below, and the same parts can refer to the relevant descriptions of the first embodiment and will not be elaborated here.

[0273] At least one rib 32 of the lower plastic 30 includes a first rib 32e, a second rib 32f, a third rib 32g, a fourth rib 32h, a fifth rib 32i, a sixth rib 32j, a seventh rib 32k, an eighth rib 32l, a ninth rib 32m, and a tenth rib 32n. Among them, the first rib 32e, the second rib 32f, the third rib 32g, the fourth rib 32h, and the fifth rib 32i can all be fixedly connected to the fourth surface 312 of the lower plastic body 31, and all protrude from the fourth surface 312 of the lower plastic body 31 in the direction of the electrode assembly 220, and are all provided around the first through hole 313. The sixth rib 32j, the seventh rib 32k, the eighth rib 32l, the ninth rib 32m, and the tenth rib 32n can all be fixedly connected to the fourth surface 312 of the lower plastic body 31, and all protrude from the fourth surface 312 of the lower plastic body 31 in the direction of the electrode assembly 220, and are all provided around the second through hole 314.

[0274] Specifically, the first rib 32e and the second rib 32f can both be located on one side of the lower plastic 30 in the width direction (the illustrated Y direction). The first rib 32e and the second rib 32f both extend along the length direction of the lower plastic 30 (the illustrated X direction), and are opposite and spaced apart in the length direction of the lower plastic 30. The third rib 32g and the fourth rib 32h are both located on the other side of the lower plastic 30 in the width direction. The third rib 32g and the fourth rib 32h both extend along the length direction of the lower plastic 30, and are opposite and spaced apart in the length direction of the lower plastic 30. The third rib 32g is also opposite and spaced apart from the first rib 32e in the width direction of the lower plastic 30, and the fourth rib 32h is also opposite and spaced apart from the second rib 32f in the width direction of the lower plastic 30. The fifth rib 32i extends along the width direction of the lower plastic 30. In the width direction of the lower plastic 30 (the illustrated Y direction), the first rib 32e, the fifth rib 32i, and the third rib 32g are arranged in sequence.

[0275] Among them, the first connecting piece 50 can be located in the gap area between the second rib 32f, the fourth rib 32h, and the fifth rib 32i, and abuts against the fifth rib 32i. The length of the fifth rib 32i can be greater than the lengths of the first rib 32e, the second rib 32f, the third rib 32g, and the fourth rib 32h. Of course, in other embodiments, the length of the fifth rib 32i can also be less than the lengths of the first rib 32e, the second rib 32f, the third rib 32g, and the fourth rib 32h, or the same as the lengths of the first rib 32e, the second rib 32f, the third rib 32g, and the fourth rib 32h, and no strict limitation is made thereto.

[0276] In addition, in the width direction of the lower plastic part 30, the distance L5 between the first rib 32e and the center line D1 in the length direction of the lower plastic part 30 of the first through hole 313 satisfies the relational expression:

[0277] (R1 + 0.5 mm) ≤ L5 ≤ (R1 + 5 mm).

[0278] In the width direction of the lower plastic part 30, the distance L6 between the second rib 32f and the center line D1 in the length direction of the lower plastic part 30 of the first through hole 313 satisfies the relational expression:

[0279] (R1 + 0.5 mm) ≤ L6 ≤ (R1 + 5 mm).

[0280] In the width direction of the lower plastic part 30, the distance L7 between the third rib 32g and the center line D1 in the length direction of the lower plastic part 30 of the first through hole 313 satisfies the relational expression:

[0281] (R1 + 0.5 mm) ≤ L7 ≤ (R1 + 5 mm);

[0282] In the width direction of the lower plastic part 30, the distance L8 between the fourth rib 32h and the center line D1 in the length direction of the lower plastic part 30 of the first through hole 313 satisfies the relational expression:

[0283] (R1 + 0.5 mm) ≤ L8 ≤ (R1 + 5 mm).

[0284] In the length direction of the lower plastic part 30, the distance between the first rib 32e and the first side 511 of the first connecting piece 50 can be greater than or equal to 0.5 mm.

[0285] In the length direction of the lower plastic part 30, the distance between the second rib 32f and the second side 512 of the first connecting piece 50 can be greater than or equal to 0.5 mm.

[0286] In the length direction of the lower plastic part 30, the distance between the third rib 32g and the first side 511 of the first connecting piece 50 can be greater than or equal to 0.5 mm.

[0287] In the length direction of the lower plastic part 30, the distance between the fourth rib 32h and the second side 512 of the first connecting piece 50 can be greater than or equal to 0.5 mm.

[0288] In the length direction of the lower plastic part 30, the distance L9 between the fifth rib 32i and the first connecting piece 50 (i.e., the distance between the fifth rib 32i and the first side 511 of the first connecting piece 50) is 0.5 mm - 9 mm.

[0289] Among them, R1 is the radius at the connection between the first pole 41 and the first connecting piece 50 in the first pole 41 (i.e., the radius of the first base 412). Moreover, the above-listed dimensional ranges include the end values of both endpoints.

[0290] It can be understood that by providing a plurality of ribs and arranging the first connecting piece 50 welded to the first pole 41 between the second rib 32f, the fourth rib 32h, and the fifth rib 32i of the lower plastic 30, the second rib 32f, the fourth rib 32h, and the fifth rib 32i can cooperate and be used for anti-fooling of the first connecting piece 50, which is beneficial to preventing the problem of the top cover assembly 100 failing due to the flipping of the first connecting piece 50, and is also beneficial to improving the assembly accuracy and assembly precision of the top cover assembly 100.

[0291] The sixth rib 32j and the seventh rib 32k can both be located on one side of the width direction (illustrated Y direction) of the lower plastic 30. The sixth rib 32j and the seventh rib 32k both extend along the length direction (illustrated X direction) of the lower plastic 30, and are opposite and spaced apart in the length direction of the lower plastic 30. The eighth rib 32l and the ninth rib 32m are both located on the other side of the width direction of the lower plastic 30. The eighth rib 32l and the ninth rib 32m both extend along the length direction of the lower plastic 30, and are opposite and spaced apart in the length direction of the lower plastic 30. The eighth rib 32l is also opposite and spaced apart from the sixth rib 32j in the width direction of the lower plastic 30, and the ninth rib 32m is also opposite and spaced apart from the seventh rib 32k in the width direction of the lower plastic 30. The tenth rib 32n extends along the width direction of the lower plastic 30. In the width direction (illustrated Y direction) of the lower plastic 30, the sixth rib 32j, the tenth rib 32n, and the eighth rib 32l are arranged in sequence.

[0292] Among them, the second connecting piece 423 can be located in the gap area between the seventh rib 32k, the ninth rib 32m, and the tenth rib 32n, and abuts against the tenth rib 32n. The length of the tenth rib 32n can be greater than the lengths of the sixth rib 32j, the seventh rib 32k, the eighth rib 32l, and the ninth rib 32m. Of course, in other embodiments, the length of the tenth rib 32n can also be less than the lengths of the sixth rib 32j, the seventh rib 32k, the eighth rib 32l, and the ninth rib 32m, or be the same as the lengths of the sixth rib 32j, the seventh rib 32k, the eighth rib 32l, and the ninth rib 32m, and no strict restrictions are imposed thereon.

[0293] In addition, in the width direction of the lower plastic 30, the distance L10 between the sixth rib 32j and the center line D2 of the second through hole 314 in the length direction of the lower plastic 30 satisfies the relationship:

[0294] (R2 + 0.5 mm) ≤ L10 ≤ (R2 + 5 mm).

[0295] In the width direction of the lower plastic 30, the distance L11 between the seventh rib 32k and the center line D2 in the length direction of the lower plastic 30 of the second through hole 314 satisfies the relational expression:

[0296] (R2 + 0.5 mm) ≤ L11 ≤ (R2 + 5 mm).

[0297] In the width direction of the lower plastic 30, the distance L12 between the eighth rib 32l and the center line D2 in the length direction of the lower plastic 30 of the second through hole 314 satisfies the relational expression:

[0298] (R2 + 0.5 mm) ≤ L12 ≤ (R2 + 5 mm);

[0299] In the width direction of the lower plastic 30, the distance L13 between the ninth rib 32m and the center line D2 in the length direction of the lower plastic 30 of the second through hole 314 satisfies the relational expression:

[0300] (R2 + 0.5 mm) ≤ L13 ≤ (R2 + 5 mm).

[0301] In the length direction of the lower plastic 30, the distance between the sixth rib 32j and the third side of the second connecting piece 423 can be greater than or equal to 0.5 mm.

[0302] In the length direction of the lower plastic 30, the distance between the seventh rib 32k and the fourth side of the second connecting piece 423 can be greater than or equal to 0.5 mm.

[0303] In the length direction of the lower plastic 30, the distance between the eighth rib 32l and the third side of the second connecting piece 423 can be greater than or equal to 0.5 mm.

[0304] In the length direction of the lower plastic 30, the distance between the ninth rib 32m and the fourth side of the second connecting piece 423 can be greater than or equal to 0.5 mm.

[0305] In the length direction of the lower plastic 30, the distance L14 between the tenth rib 32n and the second connecting piece 423 (i.e., the distance between the tenth rib 32n and the third side of the second connecting piece 423) is 0.5 mm - 9 mm.

[0306] Wherein, R2 is the radius at the connection of the second cylinder 421 and the second connecting piece 423 in the second pole column 42 (i.e., the radius of the second base 422). And, the size ranges listed above all include the end values of the two endpoints.

[0307] It is understandable that by providing a plurality of convex ribs and providing the second connecting piece 423 of the second pole 42 between the seventh convex rib 32k, the ninth convex rib 32m and the tenth convex rib 32n of the lower plastic 30, the seventh convex rib 32k, the ninth convex rib 32m and the tenth convex rib 32n can be used as a foolproof for the second connecting piece 423, which is helpful to prevent the second connecting piece 423 from being unable to be welded with the second pole tab in the electrode assembly 220 due to the change in the position of the second pole tab connecting part 4231 when the second connecting piece 423 is rotated (such as rotating 90°, 180°, etc.) during assembly. This is helpful to avoid failure of the top cover assembly 100 and improve the assembly accuracy and assembly precision of the top cover assembly 100.

[0308] Please continue to refer to Figures 29 and Figure 30 , at least one first recess 341 is provided on the side of the first boss 34 of the lower plastic 30 facing the first connecting sheet 50. The at least one first recess 341 is used to avoid the first pole tab of the electrode assembly 220. At least one second recess 351 is provided on the side of the second boss 35 of the lower plastic 30 facing the second connecting sheet 423. The at least one second recess 351 is used to avoid the second pole tab of the electrode assembly 220.

[0309] The first heat insulation sheet 91 and the second heat insulation sheet 92:

[0310] The following will describe the differences between the first thermal insulation sheet 91 of this embodiment and the first thermal insulation sheet 91 of the first embodiment, as well as the differences between the second thermal insulation sheet 92 of this embodiment and the second thermal insulation sheet 92 of the first embodiment. For the similarities, please refer to the relevant description of the first embodiment and will not be repeated here.

[0311] Please refer to Figure 29 and Figure 30 In this embodiment, the number of the first heat insulating sheets 91 can be two. Among the two first heat insulating sheets 91, one first heat insulating sheet 91 is located between the lower plastic body 31 and a first pole ear connection portion 52, and is located on the side of the first rib 32e away from the first through hole 313 and the side of the second rib 32f away from the first through hole 313, so as to avoid interference between the first heat insulating sheet 91 and the first pole 41 during assembly. The other first heat insulating sheet 91 is located between the lower plastic body 31 and the other first pole ear connection portion 52, and is located on the side of the third rib 32g away from the first through hole 313 and the side of the fourth rib 32h away from the first through hole 313, so as to avoid interference between the first heat insulating sheet 91 and the first pole 41 during assembly.

[0312] The projection of a first tab connection portion 52 on the lower plastic 30 along the Z direction falls within the range of the projection of a first thermal insulation sheet 91 on the lower plastic 30 along the Z direction;

[0313] The projection of another first tab connection part 52 on the lower plastic 30 in the Z direction falls within the range of the projection of another first heat insulation sheet 91 on the lower plastic 30 in the Z direction.

[0314] The number of the second heat insulation sheets 92 can be two. Among the two second heat insulation sheets 92, one second heat insulation sheet 92 is located between the lower plastic body 31 and a second tab connection part 4231, and is located on the side of the sixth rib 32j away from the second through hole 314 and on the side of the seventh rib 32k away from the second through hole 314, so as to avoid interference in the assembly of this second heat insulation sheet 92 with the second pole column 42. The other second heat insulation sheet 92 is located between the lower plastic body 31 and another second tab connection part 4231, and is located on the side of the eighth rib 32l away from the second through hole 314 and on the side of the ninth rib 32m away from the second through hole 314, so as to avoid interference in the assembly of this second heat insulation sheet 92 with the second pole column 42.

[0315] Wherein, the projection of a second tab connection part 4231 on the lower plastic 30 in the Z direction falls within the range of the projection of a second heat insulation sheet 92 on the lower plastic 30 in the Z direction;

[0316] The projection of another second tab connection part 4231 on the lower plastic 30 in the Z direction falls within the range of the projection of another second heat insulation sheet 92 on the lower plastic 30 in the Z direction.

[0317] Second pole column 42:

[0318] Below, the differences between the second pole column 42 of this embodiment and the second pole column 42 of the first embodiment will be described, and the same parts can refer to the relevant descriptions of the first embodiment, which will not be elaborated here.

[0319] Please refer to FIG. 29 in combination with Figure 31 , Figure 31 which is a schematic structural view of the second pole column 42 of the top cover assembly 100 shown in FIG. 29.

[0320] In this embodiment, the second pole column 42 may be provided with a cavity 424. The opening of the cavity 424 is located on the surface of the second connection piece 423 away from the second column body (not shown in the figure). The cavity 424 may extend from the second connection piece 423 through the second base (not shown in the figure) and to the second column body.

[0321] It can be understood that by making the second pole column 42 a hollow design, on the basis of ensuring the strength and electrical performance of the second pole column 42, the weight of the second pole column 42 can be reduced, thereby saving costs, improving the production efficiency of the top cover assembly 100, and making the top cover assembly 100 achieve lightweight.

[0322] Further, a flange 425 may be provided on the third side of the second connecting piece 423. The flange 425 protrudes relative to the third side of the second connecting piece 423 and protrudes in the direction of the tenth rib 32n of the downward plastic 30. By providing the flange 425, the bearing area of the second connecting piece 423 can be increased, and the second sealing ring 62 sleeved on the second pole 42 can be prevented from exceeding the edge of the second connecting piece 423, so as to better receive the second sealing ring 62.

[0323] The embodiments of the present application have been introduced in detail above. 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 and its core idea of the present application; 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 lower plastic, the lower plastic further includes a lower plastic body and at least one rib. The lower plastic body is provided with a first through hole, and the first through hole penetrates the lower plastic body along the thickness direction of the lower plastic. The at least one rib is fixedly connected to the lower plastic body and is spaced from the first through hole. A first pole, the first pole is inserted through the first through hole; and A first connecting piece, the first connecting piece is connected to the first pole. The first connecting piece is also used for welding connection with the first pole ear of the electrode assembly, so that the first pole is electrically connected to the electrode assembly through the first connecting piece. The first connecting piece is stacked with the lower plastic body and is adjacent to the at least one rib. The first connecting piece extends linearly along the width direction of the top cover assembly, and the center line of the first connecting piece in the length direction of the top cover assembly is offset relative to the center line of the first pole.

2. The top cover assembly according to claim 1, characterized in that, The first connecting piece includes a first pole connecting portion and two first pole ear connecting portions. The first pole connecting portion is connected to the first pole, so that the first connecting piece is electrically connected to the first pole. The center line of the first pole connecting portion in the length direction of the top cover assembly is coaxially arranged with the center line of the first connecting piece in the length direction of the top cover assembly and is offset relative to the center line of the first pole. The two first pole ear connecting portions are respectively fixedly connected to both sides of the first pole connecting portion in the width direction of the top cover assembly. One first pole ear connecting portion, the first pole connecting portion and the other first pole ear connecting portion are sequentially connected in the width direction of the top cover assembly and are arranged in a straight line. The two first pole ear connecting portions are used for welding connection with the first pole ear of the electrode assembly, so that the first connecting piece is electrically connected to the electrode assembly.

3. The top cover assembly according to claim 1, wherein, The at least one rib includes a first rib and a second rib, and the sizes of the first rib and the second rib along the width direction of the lower plastic are different; The first rib and the second rib are both fixedly connected to the surface of the lower plastic body facing the first connecting piece and are located on opposite sides of the first through hole along the length direction of the lower plastic. The first rib and the second rib both extend along the width direction of the lower plastic and are opposite and spaced from each other in the length direction of the lower plastic. In the length direction of the lower plastic, the first connecting piece is located between the first rib and the second rib. The distance between the first rib and the first through hole is different from the distance between the second rib and the first through hole.

4. The top cover assembly according to claim 3, characterized in that, In the length direction of the lower plastic, the distance between the first rib and the first side of the first connecting piece is 0.5 mm - 9 mm; In the length direction of the lower plastic, the distance between the second rib and the second side of the first connecting piece is 0.5 mm - 9 mm.

5. The top cover assembly according to claim 3, characterized in that The top cover assembly further includes a first heat insulating sheet, the first heat insulating sheet is located between the lower plastic body and the first connecting sheet, the first heat insulating sheet is provided with a first through hole, a first avoidance hole and a second avoidance hole, the first through hole, the first avoidance hole and the second avoidance hole all penetrate the first heat insulating sheet along the thickness direction of the first heat insulating sheet, the first through hole is penetrated by the first pole, the first avoidance hole is penetrated by the first convex rib, the size of the first avoidance hole is adapted to the size of the first convex rib, the second avoidance hole is penetrated by the second convex rib, the size of the second avoidance hole is adapted to the size of the second convex rib; The projection of the first connecting sheet on the lower plastic along the thickness direction of the top cover assembly falls within the range of the projection of the first heat insulating sheet on the lower plastic along the thickness direction of the top cover assembly.

6. The top cover assembly according to claim 1, characterized in that, The at least one convex rib includes a first convex rib, a second convex rib, a third convex rib, a fourth convex rib and a fifth convex rib, wherein the first convex rib, the second convex rib, the third convex rib, the fourth convex rib and the fifth convex rib are all arranged at the periphery of the first through hole; The first convex rib and the second convex rib are both located on one side of the lower plastic in the width direction, the first convex rib and the second convex rib extend along the length direction of the lower plastic, and are opposite and spaced apart in the length direction of the lower plastic; The third convex rib and the fourth convex rib are both located on the other side of the width direction of the lower plastic, the third convex rib and the fourth convex rib are both extended along the length direction of the lower plastic, and are arranged opposite to and spaced apart in the length direction of the lower plastic, the third convex rib is also arranged opposite to and spaced apart from the first convex rib in the width direction of the lower plastic, and the fourth convex rib is also arranged opposite to and spaced apart from the second convex rib in the width direction of the lower plastic; The fifth convex rib extends along the width direction of the lower plastic, and the first convex rib, the fifth convex rib and the third convex rib are arranged in sequence in the width direction of the lower plastic; The first connecting piece is located in a gap area between the second convex rib, the fourth convex rib and the fifth convex rib, and abuts against the fifth convex rib.

7. The top cover assembly according to claim 6, wherein The top cover assembly also includes two first heat insulation sheets; A first heat insulating sheet is located between the lower plastic body and a first pole ear connection portion, and is located on a side of the first convex rib and the second convex rib away from the first through hole, and a projection of the first pole ear connection portion on the lower plastic along the thickness direction of the top cover component falls within the range of a projection of the first heat insulating sheet on the lower plastic along the thickness direction of the top cover component; Another of the first thermal insulation sheets is located between the lower plastic body and another of the first pole ear connecting portions, and is located on the side of the third rib and the fourth rib away from the first through hole, and a projection of another of the first pole ear connecting portions on the lower plastic along the thickness direction of the top cover assembly falls within the range of a projection of another of the first thermal insulation sheets on the lower plastic along the thickness direction of the top cover assembly.

8. The top cover assembly according to claim 6, wherein, In the first pole column, the radius at the connection between the first pole column and the first connecting piece is R1; In the width direction of the lower plastic, the distance L5 between the first rib and the center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1 + 0.5 mm) ≤ L5 ≤ (R1 + 5 mm); In the width direction of the lower plastic, the distance L6 between the second rib and the center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1 + 0.5 mm) ≤ L6 ≤ (R1 + 5 mm); In the width direction of the lower plastic, the distance L7 between the third rib and the center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1 + 0.5 mm) ≤ L7 ≤ (R1 + 5 mm); In the width direction of the lower plastic, the distance L8 between the fourth rib and the center line of the first through hole in the length direction of the lower plastic satisfies the relationship: (R1 + 0.5 mm) ≤ L8 ≤ (R1 + 5 mm); In the length direction of the lower plastic, the distance between the fifth rib and the first side of the first connecting piece is 0.5 mm - 9 mm.

9. The top cover assembly according to claim 5 or 7, characterized in that, The lower plastic further includes a retaining wall, which is disposed around the outer edge of the lower plastic body and protrudes relative to the surface of the lower plastic body facing the first connecting piece. The retaining wall and the lower plastic body enclose a receiving groove, and the first heat insulating sheet, a part of the first pole column, and a part of the first connecting piece are all located in the receiving groove.

10. The top cover assembly according to claim 9, characterized in that, The lower plastic further includes a first boss and a second boss. The first boss and the second boss are both fixedly connected to the lower plastic body and protrude relative to the surface of the lower plastic body facing the first connecting piece. The first boss and the second boss are respectively located at both ends in the length direction of the lower plastic body and are connected to the retaining wall. At least one first recess is provided on the side of the first boss facing the first connecting piece, and at least one second recess is provided on the side of the second boss facing the first connecting piece. At least one first recess and at least one second recess are both used to avoid the electrode assembly.

11. The top cover assembly according to any one of claims 1-8, characterized in that On the surface of each first tab connection part facing the electrode assembly, it is recessed in the direction of the top cover relative to the surface of the first pole column connection part facing the electrode assembly. A part of the first pole column is located in the gap area between the first pole column connection part and the lower plastic and is welded to the first pole column connection part.

12. The top cover assembly according to any one of claims 1-8, characterized in that, The lower plastic includes a first side surface, which is the end surface at one end in the length direction of the lower plastic. The first pole column connection part includes a first side and a second side, and the first side and the second side are oppositely arranged in the length direction of the top cover assembly, and the first side is closer to the first side surface than the second side; The first connecting piece further includes an array of indentations, which are provided on the surface of the first pole connection portion facing away from the lower plastic. The minimum distance along the length direction of the top cover assembly between the array of indentations and the first side is less than the minimum distance along the length direction of the top cover assembly between the array of indentations and the second side. The projection of the first pole on the first connecting piece along the thickness direction of the top cover assembly falls within the area surrounded by the array of indentations on the first connecting piece.

13. The top cover assembly according to any one of claims 1-8, characterized in that, The weld mark of the first pole connection portion is a solid weld mark.

14. The top cover assembly according to any one of claims 1-8, characterized in that, The top cover assembly further includes a second pole, which is of an integral structure and includes a second cylinder body, a second base, and a second connecting piece; The second cylinder body passes through the lower plastic and is spaced from the first pole in the length direction of the top cover assembly; The second base is coaxially arranged with the second cylinder body and is connected between the second cylinder body and the second connecting piece; The second connecting piece is laminated with the lower plastic and extends linearly along the width direction of the top cover assembly. The second connecting piece includes two second pole ear connection portions, which are respectively located on both sides of the second base. The two second pole ear connection portions are used for welding connection with the second pole ears of the electrode assembly, so that the second connecting piece is electrically connected to the electrode assembly.

15. The top cover assembly according to claim 14, characterized in that, The center line of the second connecting piece in the length direction of the top cover assembly is offset relative to the center line of the second cylinder body; The distance between the center line of the first pole and the center line of the second cylinder body is greater than the distance between the center line of the first connecting piece in the length direction of the top cover assembly and the center line of the second connecting piece in the length direction of the top cover assembly.

16. The top cover assembly according to claim 14, characterized in that, The second pole is of a solid structure, or the second pole is provided with a cavity, and the opening of the cavity is located on the surface of the second connecting piece facing away from the second cylinder body. The cavity extends from the second connecting piece through the second base and to the second cylinder body.

17. A battery, characterized in that, The battery includes an electrode assembly, a housing, and the top cover assembly according to any one of claims 1-16. The top cover assembly is connected to the housing and encloses a containing space with the housing, and the electrode assembly is located in the containing space.

18. An electrical device, characterized in that, The electrical device includes the battery according to claim 17.

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