Secondary battery and electric device
By setting an inclined structure on the pole assembly hole wall and surface of the secondary battery, the use of low-cost copper-aluminum composite materials and the improvement of space utilization are achieved, and the problems of high costs and low space utilization in the prior art are solved.
Patent Information
- Application Number
- CN202323240044.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2033-11-29
AI Technical Summary
The existing secondary batteries have high requirements for bonding strength of the electrode column copper-aluminum composite surface, resulting in high preparation costs and inability to reduce the size, limiting the space utilization rate.
By providing an inclined structure on the assembly hole wall and the surface of the pole column, the pole column is under pressure, a low-cost copper-aluminum composite material is used, and the space utilization is increased by adjustment of the space components.
The preparation cost of the pole column composite structure is reduced and the space utilization is improved. Through the decomposition force of the inclined structure, it can adapt to the installation of pole columns of different sizes and shapes, thereby enhancing stability and support.
Smart Images
Figure CN222282131U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of battery technology, and specifically relates to secondary batteries and electrical devices. Background Art
[0002] Currently, the poles of secondary batteries generally adopt riveting or injection molding structures, and the vertically distributed components are fastened by the tension of the poles. This structure has high requirements on the bonding strength of the copper-aluminum composite surface of the negative pole, and can only use high-stability but high-cost friction welding technology, which leaves no room for further size reduction, thus resulting in high cost and high space utilization limitations. Utility Model Content
[0003] Purpose of the utility model: The embodiments of the present application provide a secondary battery and an electrical device, which put the copper-aluminum joint surface of the pole under pressure, thereby reducing costs and improving space utilization.
[0004] Technical solution: The secondary battery described in the embodiment of the present application includes: a shell having a receiving cavity; an electrode assembly, the electrode assembly is arranged in the receiving cavity; a top cover assembly, the top cover assembly is connected to the shell and covers the receiving cavity; the top cover assembly includes:
[0005] A top cover sheet, wherein the top cover sheet is provided with an assembly hole, and the axial direction of the assembly hole is a first direction X; the assembly hole has a hole wall, and the hole wall includes a first surface and a second surface connected to each other, and the first surface and the second surface are arranged obliquely relative to the first direction X;
[0006] A pole, the pole is passed through the assembly hole, and there is a gap between the pole and the hole wall;
[0007] A spacing component, the spacing component is arranged in the gap and abuts against the hole wall and the pole;
[0008] The pole includes a first side surface and a second side surface connected to each other; the first side surface is arranged toward the first surface, the second side surface is arranged toward the second surface, and the first side surface and the second side surface are arranged obliquely relative to the first direction X.
[0009] In some embodiments, the radial direction along the assembly hole is a second direction Y, and the second direction Y intersects with the first direction X;
[0010] The interval between the first surfaces in the second direction Y decreases along the first direction X, and the interval between the second surfaces in the second direction Y increases along the first direction X.
[0011] In some embodiments, the top cover assembly satisfies at least one of the following features:
[0012] a) an angle α is formed between the first surface and the second surface, and the angle α satisfies: 90°≤α<180°;
[0013] b) An angle β is formed between the first side surface and the second side surface, and the angle β satisfies: 90°≤β<180°.
[0014] In some embodiments, the spacing assembly includes an insulating member and a sealing member, a first gap is defined between the first side surface and the first surface, a second gap is defined between the second side surface and the second surface, and the first gap is connected to the second gap to form the gap;
[0015] The insulating member is disposed in the first gap, and the insulating member abuts against both the first surface and the first side surface; the sealing member is disposed in the second gap, and the sealing member abuts against both the second surface and the second side surface.
[0016] In some embodiments, the spacing assembly includes an insulating member and a sealing member, a first gap is defined between the first side surface and the first surface, a second gap is defined between the second side surface and the second surface, and the first gap is connected to the second gap to form the gap;
[0017] The insulating member is arranged in the first gap and the second gap, and the insulating member abuts against the first surface, the first side surface, the second surface and the second side surface; the sealing member is arranged in the second gap, and the sealing member abuts against the second surface and the second side surface.
[0018] In some embodiments, the spacing assembly includes an insulating member and a sealing member, a first gap is defined between the first side surface and the first surface, a second gap is defined between the second side surface and the second surface, and the first gap is connected to the second gap to form the gap;
[0019] The insulating member is arranged in the first gap, and the insulating member abuts against both the first surface and the first side surface; the sealing member is arranged in the first gap and the second gap, and the sealing member abuts against both the first surface, the first side surface, the second surface and the second side surface.
[0020] In some embodiments, a first groove is disposed on the second surface, the first groove is recessed in a direction away from the sealing member, and at least a portion of the sealing member is located in the first groove.
[0021] In some embodiments, the groove has a bottom surface, and the bottom surface is a plane or an arc surface.
[0022] In some embodiments, the pole includes a first pole portion and a second pole portion sequentially arranged along the first direction X;
[0023] The first pole portion includes a first body and a first extension portion connected to the first body, the first extension portion protrudes from the first body along a second direction Y; the first extension portion forms the second side surface toward the outer periphery of the second surface;
[0024] The second pole portion includes a second body and a second extension portion connected to the second body, the second body is connected to the first body, the second extension portion protrudes from the second body along a second direction Y and is connected to the first extension portion; the first extension portion is connected to the outer periphery of the first surface toward the outer periphery of the second extension portion toward the first surface, and forms the first side surface.
[0025] In some embodiments, a second groove is disposed on a side of the second body away from the first body, and the second groove is recessed toward the first body.
[0026] In some embodiments, the present application also provides an electrical device, including the secondary battery.
[0027] Beneficial effect: The secondary battery of the embodiment of the present application comprises: a shell, the shell having a accommodating cavity; an electrode assembly, the electrode assembly is arranged in the accommodating cavity; a top cover assembly, the top cover assembly is connected to the shell and covers the accommodating cavity; the top cover assembly comprises: a top cover sheet, the top cover sheet is provided with an assembly hole, and the axial direction along the assembly hole is a first direction X; the assembly hole has a hole wall, the hole wall comprises a first surface and a second surface connected to each other, and the first surface and the second surface are inclined relative to the first direction X; a pole, the pole is passed through the assembly hole, and there is a gap between the pole and the hole wall; a spacer assembly, the spacer assembly is arranged in the gap and abuts against the hole wall and the pole; wherein the pole comprises a first side surface and a second side surface connected to each other; the first side surface is arranged toward the first surface, and the second side surface is arranged toward the second surface, and the first side surface and the second side surface are inclined relative to the first direction X. In the secondary battery provided by the present application, since the hole wall of the assembly hole and the surface of the pole are both inclined, the pole can be clamped in the assembly hole by the top cover sheet, so that the pole is under pressure relative to the top cover sheet, which can reduce the preparation cost of the pole composite structure; at the same time, since the pole is inclined relative to the surface of the assembly hole, the size of the pole in the first direction X can be reduced, and the force in the first direction X can be decomposed to change the setting and distribution direction of the spacer assembly, thereby effectively increasing the height space utilization rate.
[0028] The electric device of the embodiment of the present application may include all the technical features and beneficial effects of the above-mentioned secondary battery, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0030] Figure 1 A schematic diagram of the structure of the top cover assembly provided in an embodiment of the present application;
[0031] Figure 2 A schematic diagram of a pole structure provided in an embodiment of the present application;
[0032] Figure 3 A schematic diagram of the structure of a top cover assembly provided in an embodiment of the present application;
[0033] Figure 4 A schematic diagram of another top cover assembly structure provided in an embodiment of the present application;
[0034] Figure 5 A schematic diagram of a structural surface of another top cover assembly provided in an embodiment of the present application;
[0035] Figure 6 A schematic diagram of the first groove structure provided in an embodiment of the present application;
[0036] Figure 7 A partial schematic diagram of a hole wall provided in an embodiment of the present application;
[0037] Figure 8 A schematic diagram of the secondary battery structure provided in an embodiment of the present application;
[0038] Figure markings: 1-top cover assembly, 2-electrode assembly, 3-shell, 31-accommodating cavity, 10-top cover sheet, 101-assembly hole, 102-hole wall, 1021-first surface, 1022-second surface, 1023-first groove, 1024-bottom surface, 20-pole, 21-first pole part, 22-second pole part, 211-first body, 212-first extension part, 221-second body, 222-second extension part, 201-first side, 202-second side, 2211-second groove, 30-gap, 301-first gap, 302-second gap, 40-spacer assembly, 401-insulating member, 402-sealing member. DETAILED DESCRIPTION
[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0040] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.
[0041] The applicant noted that the negative electrode of the current secondary battery mainly adopts copper-aluminum friction welding electrode, and generally uses the tension of the electrode to fasten the vertically distributed components such as plastic, top cover, and sealing ring; this type of structure has high requirements on the bonding strength of the copper-aluminum composite surface of the negative electrode, and can only use high-stability but high-cost friction welding process, and there is no room for further reduction in the size of the electrode; thus resulting in higher battery preparation costs and high space utilization limitations.
[0042] Based on this, it is necessary to provide a secondary battery and an electrical device to solve the above problems.
[0043] See also Figure 1 , Figure 3 and Figure 8The secondary battery comprises: a shell 3, an electrode assembly 2 and a top cover assembly 1; the shell 3 has a receiving cavity 31; the electrode assembly 2 is arranged in the receiving cavity 31; the top cover assembly 1 is connected to the shell 3 and covers the receiving cavity 31. The top cover assembly 1 includes: a top cover sheet 10, a pole 20 and a spacing assembly 40; the top cover sheet 10 is provided with an assembly hole 101, and the axial direction along the assembly hole 101 is a first direction X; the assembly hole 101 has a hole wall 102, and the hole wall 102 includes a first surface 1021 and a second surface 1022 connected to each other, and the first surface 1021 and the second surface 1022 are arranged obliquely relative to the first direction X; the pole 20 is passed through the assembly hole 101, and a gap 30 is provided between the pole 20 and the hole wall 102; the spacing assembly 40 is arranged in the gap 30, and abuts against the hole wall 102 and the pole 20; wherein the pole 20 includes a first side surface 201 and a second side surface 202 connected to each other; the first side surface 201 is arranged toward the first surface 1021, and the second side surface 202 is arranged toward the second surface 1022, and the first side surface 201 and the second side surface 202 are arranged obliquely relative to the first direction X.
[0044] It can be understood that the hole wall 102 of the assembly hole 101 is tilted relative to the first direction X, so that the assembly hole 101 is a hole with a conical structure. Since the hole wall 102 of the assembly hole 101 is tilted, the pole 20 can be clamped in the assembly hole 101 by the top cover sheet 10. At this time, the pole 20 is under pressure relative to the top cover sheet 10, so that various low-cost copper-aluminum composite materials can also meet the use requirements, thereby effectively reducing the preparation cost; at the same time, the first side surface 201 and the second side surface 202 of the pole 20 are tilted relative to the first direction X, so that the side of the pole 20 is in a conical shape, which can reduce the size of the pole 20 in the first direction X on the one hand, and disperse the force on the pole 20 to the second direction Y perpendicular to the first direction X, that is, the radial direction of the assembly hole; thereby, the spacing component 40 distributed along the first direction X is changed to extend along the second direction Y, reducing the overall height of the spacing component 40 in the first direction X, thereby effectively increasing the height space utilization. In addition, there is a gap 30 between the pole 20 and the hole wall 102 of the assembly hole 101. The gap 30 can make it easier for the spacing component 40 to enter the assembly hole during the assembly process, and can allow certain adjustments and changes to adapt to different assembly requirements; the spacing component 40 is between the pole 20 and the hole wall 102, and abuts against both, which can provide better stability and support, and provide a better ability to disperse loads.
[0045] In some embodiments, see Figure 3, the radial direction along the assembly hole 101 is the second direction Y, and the second direction Y intersects with the first direction X; the spacing of the first surface 1021 in the second direction Y decreases along the first direction X, and the spacing of the second surface 1022 in the second direction Y increases along the first direction X. It can be understood that the connection between the first surface 1021 and the second surface 1022 can be used as the boundary between the upper and lower parts of the assembly hole 101, wherein the first surface 1021 surrounds to form the upper half of the assembly hole 101, and the second surface 1022 surrounds to form the lower half of the assembly hole 101. When the spacing of the first surface 1021 in the second direction Y decreases along the first direction X, and the spacing of the second surface 1022 in the second direction Y increases along the first direction X, the assembly hole 101 is a tapered structure with a large center and small sides, which can better meet the requirements of assembling poles 20 of different sizes and shapes, and apply pressure to the surface of the pole 20; it can also increase the contact area between the spacing component 40, so that the spacing component better abuts against the gap 30.
[0046] In some embodiments, see further Figure 7 , an angle α is formed between the first surface 1021 and the second surface 1022, and the angle α satisfies: 90°≤α<180°; an angle β is formed between the first side surface 201 and the second side surface 202, and the angle β satisfies: 90°≤β<180°. It can be understood that the angle α can be any value of 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or a range between any two values, and the angle β can be any value of 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, or a range between any two values. Among them, not all values of α and β are shown in the example of this embodiment. In other embodiments, the values of α and β may be different from the above, and the example in this embodiment does not constitute an improper limitation thereto.
[0047] Here, it can be understood by those skilled in the art that a two-dimensional measuring instrument, a three-dimensional measuring instrument or other instruments can be used to detect the size of the aforementioned angle α and angle β. Exemplarily, when in use, the pole 20 is placed in the two-dimensional measuring instrument, and the two-dimensional measuring instrument can be used to obtain the fitting projection line segment of the first side 201 and the second side 202 along the tangent direction of the pole 20. The operator can select the number of sampling points on the fitting projection line segment. The more sampling points, the higher the accuracy of the fitting projection line segment. Then, the two-dimensional measuring instrument can measure the angle between the first side 201 and the second side 202 based on the fitting projection line segment of the first side 201 and the second side 202; similarly, if a three-dimensional measuring instrument is used to measure the angle α, it can collect the three-dimensional coordinate parameters of the first surface 1021 and the second surface 1022, and then calculate the angle α between the first surface 1021 and the second surface 1022. Among them, usually, the first surface 1021 and the second surface 1022, as well as the first side surface 201 and the second side surface 202 are planes; if they are curved surfaces, the angle between the planes on which the line between the two end points lies can be measured as the aforementioned angle α or angle β; of course, the examples in this embodiment do not constitute an undue limitation to the present application, and in other embodiments, other methods may also be used to measure the aforementioned angle α and angle β.
[0048] It should be noted that, by limiting the range of the angle α between the first surface 1021 and the second surface 1022, the assembly hole 101 can be made into a tapered hole structure, and the problem of difficulty in installing the pole 20 due to too small α is avoided during the assembly process. By limiting the range of the angle β between the first side surface 201 and the second side surface 202, the side surface of the pole 20 can be made into a tapered surface structure, and the problem of difficulty in forming the pole due to too small β is avoided.
[0049] In some embodiments, see further Figure 3 The spacing component 40 includes an insulating member 401 and a sealing member 402. A first gap 301 is provided between the first side surface 201 and the first surface 1021, a second gap 302 is provided between the second side surface 202 and the second surface 1022, and the first gap 301 and the second gap 302 are connected to form a gap 30; the insulating member 401 is arranged in the first gap 301, and the insulating member 401 abuts against both the first surface 1021 and the first side surface 201; the sealing member 402 is arranged in the second gap 302, and the sealing member 402 abuts against both the second surface 1022 and the second side surface 202.
[0050] It can be understood that the insulating member 401 can be an upper plastic, and the sealing member 402 can be a sealing ring. Since the assembly hole 101 is a conical structure, the upper plastic and the sealing ring can be wrapped and arranged in the gap 30; wherein the insulating member 401 is arranged in the first gap 301, and abuts against the first surface 1021 and the first side surface 201 respectively, so as to achieve the insulation effect between the pole 20 and the top cover sheet 10; the sealing member 402 is arranged in the second gap 302, and the sealing member 402 abuts against the second surface 1022 and the second side surface 202, so as to achieve the sealing effect between the pole 20 and the top cover sheet 10. wherein, since the insulating member 401 and the sealing member 402 abut against the corresponding surfaces and sides, the insulating member 401 and the sealing member 402 can be adjusted as needed to adapt to different assembly requirements and environmental conditions.
[0051] In some embodiments, see further Figure 4 , the insulating member 401 is disposed in the first gap 301 and the second gap 302, and the insulating member 401 abuts against the first surface 1021, the first side surface 201, the second surface 1022 and the second side surface 202; the sealing member 402 is disposed in the second gap 302, and the sealing member 402 abuts against the second surface 1022 and the second side surface 202. It can be understood that, since the gap 30 has the first gap 301 and the second gap 302 connected, the insulating member 401 can be disposed in the first gap 301 and the second gap 302 at the same time, at which time the sealing member 402 continues to cooperate with the lower half of the pole, and the insulating member extends from the upper half to the lower half of the pole to control the size of the second gap 302 and ensure the compression amount of the sealing member 402.
[0052] In some embodiments, see further Figure 5 , the insulating member 401 is arranged in the first gap 301, and the insulating member 401 abuts against the first surface 1021 and the first side surface 201; the sealing member 402 is arranged in the first gap 301 and the second gap 302, and the sealing member 402 abuts against the first surface 1021, the first side surface 201, the second surface 1022 and the second side surface 202. It can be understood that, since the gap 30 has the first gap 301 and the second gap 302 connected, the sealing member 402 can be arranged in the first gap 301 and the second gap 302 at the same time, at this time, the insulating member 401 continues to keep matching with the upper half of the pole 20, and the sealing member 402 extends from the lower half of the pole 20 to the upper half, so that the sealing member 402 is hung by the pole 20, thereby improving the firmness of the assembly and the reliability of the seal.
[0053] In some embodiments, see further Figure 6, a first groove 1023 is provided on the second surface 1022, and the first groove 1023 is recessed in a direction away from the sealing member 402, and at least a portion of the sealing member 402 is located in the first groove 1023. It can be understood that the first groove 1023 can provide a better sealing effect, and when the sealing member 402 is located in the groove, the recessed shape can fit closely with the surface of the sealing member 402, and the recessed design can also increase the pressure resistance of the sealing member 402, and when external pressure is applied to the sealing member 402, the structure of the groove can provide additional support to prevent the sealing member 402 from being squeezed, deformed or damaged.
[0054] In some embodiments, the first groove 1023 has a bottom surface 1024, and the bottom surface 1024 is a plane or an arc surface. The plane or arc surface bottom surface can provide a larger contact area, so that the contact between the seal 402 and the first groove 1023 is more uniform, which helps to improve the sealing performance between the seal 402 and the first groove 1023; in addition, the plane or arc surface bottom surface can also evenly disperse stress, thereby reducing the risk of deformation or damage of the seal 402 or the first groove 1023; and compared with complex shapes, the plane or arc surface bottom surface is easier to process and manufacture, and is also easier to cooperate and install with other components.
[0055] In some embodiments, see further Figure 2 and Figure 3 The pole 20 includes a first pole portion 21 and a second pole portion 22 arranged in sequence along the first direction X; the first pole portion 21 includes a first body 211 and a first extension portion 212 connected to the first body 211, and the first extension portion 212 protrudes from the first body 211 along the second direction Y; the first extension portion 212 forms a second side surface 202 toward the periphery of the second surface 1022; the second pole portion 22 includes a second body 221 and a second extension portion 222 connected to the second body 221, the second body 221 is connected to the first body 211, and the second extension portion 222 protrudes from the second body 221 along the second direction Y and is connected to the first extension portion 212; the periphery of the first extension portion 212 toward the first surface 1021 is connected to the periphery of the second extension portion 222 toward the first surface 1021, and forms a first side surface 201.
[0056] It can be understood that the pole 20 is made of a copper-aluminum composite material and can be formed by cold heading of various solid-phase or solid-liquid composite plates, wherein the first pole portion 21 is made of copper and the second pole portion 22 is made of aluminum; wherein the connection between the first pole portion 21 and the second pole portion 22 can enhance the structural stability of the entire pole 20, and can effectively share and transmit the force applied by the top cover sheet 10; at the same time, the protruding design of the first extension portion 212 and the second extension portion 222 can form a conical structure of the pole 20, which can increase the rigidity of the pole 20 in the second direction Y, and ensure that the pole 20 can always be in a stressed state, so as to improve the performance of the pole 20.
[0057] In some embodiments, a second groove 2211 is provided on a side of the second body 221 away from the first body 211, and the second groove 2211 is recessed toward the first body 211. It can be understood that by providing the second groove 2211, the material usage of the pole 20 can be saved and the weight of the pole 20 can be further reduced.
[0058] In some embodiments, this embodiment also provides an electrical device, including the secondary battery provided in this embodiment. Among them, the electrical device can be an application device such as a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, and an electric tool. The vehicle can be a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical devices.
[0059] The secondary battery and the electrical device provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A secondary battery, characterized in that: include: A housing (3), wherein the housing (3) has a receiving cavity (31); An electrode assembly (2), the electrode assembly (2) being arranged in the accommodating cavity (31); A top cover assembly (1), the top cover assembly (1) being connected to the shell (3) and covering the accommodating cavity (31); the top cover assembly (1) comprising: A top cover sheet (10), the top cover sheet (10) being provided with an assembly hole (101), the axial direction of the assembly hole (101) being a first direction (X); the assembly hole (101) having a hole wall (102), the hole wall (102) comprising a first surface (1021) and a second surface (1022) connected to each other, the first surface (1021) and the second surface (1022) being arranged obliquely relative to the first direction (X); A pole (20), the pole (20) being inserted into the assembly hole (101), and a gap (30) being provided between the pole (20) and the hole wall (102); A spacing component (40), the spacing component (40) being arranged in the gap (30) and abutting against both the hole wall (102) and the pole (20); The pole (20) comprises a first side surface (201) and a second side surface (202) connected to each other; the first side surface (201) is arranged toward the first surface (1021), the second side surface (202) is arranged toward the second surface (1022), and the first side surface (201) and the second side surface (202) are arranged obliquely relative to the first direction (X).
2. The secondary battery according to claim 1, characterized in that: A radial direction along the assembly hole (101) is a second direction (Y), and the second direction (Y) intersects with the first direction (X); The spacing of the first surfaces (1021) in the second direction (Y) decreases along the first direction (X), and the spacing of the second surfaces (1022) in the second direction (Y) increases along the first direction (X).
3. The secondary battery according to claim 1, characterized in that: The top cover assembly (1) satisfies at least one of the following features: a) an angle α is formed between the first surface (1021) and the second surface (1022), and the angle α satisfies: 90°≤α<180°; b) An angle β is formed between the first side surface (201) and the second side surface (202), and the angle β satisfies: 90°≤β<180°.
4. The secondary battery according to claim 1, characterized in that: The spacing component (40) comprises an insulating member (401) and a sealing member (402); a first gap (301) is provided between the first side surface (201) and the first surface (1021); a second gap (302) is provided between the second side surface (202) and the second surface (1022); the first gap (301) and the second gap (302) are connected to form the gap (30); The insulating member (401) is arranged in the first gap (301), and the insulating member (401) is in contact with both the first surface (1021) and the first side surface (201); the sealing member (402) is arranged in the second gap (302), and the sealing member (402) is in contact with both the second surface (1022) and the second side surface (202).
5. The secondary battery according to claim 1, characterized in that: The spacing component (40) comprises an insulating member (401) and a sealing member (402); a first gap (301) is provided between the first side surface (201) and the first surface (1021); a second gap (302) is provided between the second side surface (202) and the second surface (1022); the first gap (301) and the second gap (302) are connected to form the gap (30); The insulating member (401) is arranged in the first gap (301) and the second gap (302), and the insulating member (401) is in contact with the first surface (1021), the first side surface (201), the second surface (1022) and the second side surface (202); the sealing member (402) is arranged in the second gap (302), and the sealing member (402) is in contact with the second surface (1022) and the second side surface (202).
6. The secondary battery according to claim 1, characterized in that: The spacing component (40) comprises an insulating member (401) and a sealing member (402); a first gap (301) is provided between the first side surface (201) and the first surface (1021); a second gap (302) is provided between the second side surface (202) and the second surface (1022); the first gap (301) and the second gap (302) are connected to form the gap (30); The insulating member (401) is arranged in the first gap (301), and the insulating member (401) is in contact with both the first surface (1021) and the first side surface (201); the sealing member (402) is arranged in the first gap (301) and the second gap (302), and the sealing member (402) is in contact with both the first surface (1021), the first side surface (201), the second surface (1022), and the second side surface (202).
7. The secondary battery according to any one of claims 4 to 6, characterized in that: A first groove (1023) is provided on the second surface (1022), the first groove (1023) is recessed in a direction away from the sealing element (402), and at least a portion of the sealing element (402) is located in the first groove (1023).
8. The secondary battery according to claim 7, characterized in that: The groove (1023) has a bottom surface (1024), and the bottom surface (1024) is a plane or an arc surface.
9. The secondary battery according to claim 2, characterized in that: The pole (20) comprises a first pole portion (21) and a second pole portion (22) which are sequentially arranged along the first direction (X); The first pole portion (21) comprises a first body (211) and a first extension portion (212) connected to the first body (211), the first extension portion (212) protruding from the first body (211) along a second direction (Y); the first extension portion (212) forms the second side surface (202) toward the outer periphery of the second surface (1022); The second pole portion (22) comprises a second body (221) and a second extension portion (222) connected to the second body (221); the second body (221) is connected to the first body (211); the second extension portion (222) protrudes from the second body (221) along a second direction (Y) and is connected to the first extension portion (212); the outer periphery of the first extension portion (212) toward the first surface (1021) is connected to the outer periphery of the second extension portion (222) toward the first surface (1021), and the first side surface (201) is formed.
10. The secondary battery according to claim 9, characterized in that: A second groove (2211) is provided on a side of the second body (221) away from the first body (211), and the second groove (2211) is recessed in a direction approaching the first body (211).
11. An electrical device, characterized in that: A secondary battery comprising the secondary battery according to any one of claims 1 to 10.