Secondary battery and electric device

Abstract

A secondary battery and an electric device. The secondary battery comprises: a case (3), the case having an accommodating cavity (31); an electrode assembly (2) arranged in the accommodating cavity (31); and a top cover assembly (1). The top cover assembly (1) is connected to the case (3) and covers the accommodating cavity (31). The top cover assembly (1) comprises: a top cover piece (10), wherein assembly holes (101) are formed in the top cover piece (10), each assembly hole (101) is provided with a hole wall (102), the hole wall (102) comprises a first surface (1021) and a second surface (1022) connected to each other, and the first surface (1021) and the second surface (1022) are obliquely arranged; poles (20) passing through the assembly holes (101), wherein a gap (30) is formed between each pole (20) and the corresponding hole wall (102); and spacing assemblies (40) provided in the gaps (30) and abutting against the hole walls (102) and the poles (20), wherein each pole (20) comprises a first side surface (201) and a second side surface (202) connected to each other, and the first side surface (201) and the second side surface (202) are obliquely arranged. The hole walls (102) of the assembly holes (101) and the surfaces of the poles (20) are obliquely arranged, so that the poles (20) can be hooped in the assembly holes (101) by the top cover piece (10), and the poles (20) are in a pressed working condition relative to the top cover piece (10), reducing the preparation costs.

Description

Secondary batteries and electrical devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 29, 2023, with application number 202323240044.5 and application name “Secondary Batteries and Electrical Devices”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to, but are not limited to, the field of battery technology, and specifically to secondary batteries and electrical devices. Background Art

[0003] Currently, the terminals of secondary batteries generally adopt riveted or injection-molded structures, and the tension of the terminals is used to fasten the vertically distributed components. This structure requires high bonding strength of the copper-aluminum composite surface of the negative terminal, and can only use the highly stable but high-cost friction welding process, which leaves no room for further size reduction, resulting in high cost and high space utilization limitations. SUMMARY OF THE INVENTION

[0004] The present application provides a secondary battery and an electrical device, which enable the copper-aluminum joint surface of the pole to be under pressure, thereby reducing costs and improving space utilization.

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] In a first aspect, a secondary battery is provided, comprising: a housing having a receiving cavity; an electrode assembly disposed within the receiving cavity; and a top cover assembly connected to the housing and sealing the receiving cavity; the top cover assembly comprising:

[0007] A top cover sheet, wherein the top cover sheet is provided with an assembly hole, wherein the axial direction of the assembly hole is a first direction X; the assembly hole has a hole wall, wherein 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;

[0008] A pole, the pole being passed through the assembly hole, with a gap between the pole and the hole wall;

[0009] a spacer assembly, the spacer assembly being arranged in the gap and abutting against both the hole wall and the pole;

[0010] 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.

[0011] Optionally, the radial direction along the assembly hole is a second direction Y, and the second direction Y intersects with the first direction X;

[0012] 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.

[0013] Optionally, the top cover assembly satisfies at least one of the following features:

[0014] a) an angle α is formed between the first surface and the second surface, and the angle α satisfies: 90°≤α<180°;

[0015] b) An angle β is formed between the first side surface and the second side surface, and the angle β satisfies: 90°≤β<180°.

[0016] Optionally, the spacer 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 and the second gap are connected to form the gap;

[0017] The insulating member is disposed in the first gap and abuts against both the first surface and the first side surface; the sealing member is disposed in the second gap and abuts against both the second surface and the second side surface.

[0018] Optionally, the spacer 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 and the second gap are connected to form the gap;

[0019] 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.

[0020] Optionally, the spacer 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 and the second gap are connected to form the gap;

[0021] The insulating member is arranged in the first gap and abuts against the first surface and the first side surface; the sealing member is arranged in the first gap and the second gap and abuts against the first surface, the first side surface, the second surface and the second side surface.

[0022] Optionally, a first groove is provided on the second surface, the first groove is recessed in a direction away from the sealing component, and at least a portion of the sealing component is located in the first groove.

[0023] Optionally, the groove has a bottom surface, and the bottom surface is a plane or an arc surface.

[0024] Optionally, the pole includes a first pole portion and a second pole portion sequentially arranged along the first direction X;

[0025] The first pole portion includes a first body and a first extension portion connected to the first body, the first extension portion protruding from the first body along the second direction Y; the first extension portion forms the second side surface toward the outer periphery of the second surface;

[0026] 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 the 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.

[0027] Optionally, a second groove is provided on a side of the second body away from the first body, and the second groove is recessed toward the first body.

[0028] In a second aspect, an embodiment of the present application further provides an electrical device comprising the aforementioned secondary battery. Beneficial effects

[0029] 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 component, thereby effectively increasing the height space utilization rate.

[0030] 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

[0031] FIG1 is a schematic structural diagram of a top cover assembly provided in an embodiment of the present application;

[0032] FIG2 is a schematic diagram of a pole structure provided in an embodiment of the present application;

[0033] FIG3 is a schematic diagram of the structure of a top cover assembly provided in an embodiment of the present application;

[0034] FIG4 is a schematic diagram of the structure of another top cover assembly provided in an embodiment of the present application;

[0035] FIG5 is a schematic diagram of the structure of another top cover assembly provided in an embodiment of the present application;

[0036] FIG6 is a schematic diagram of the first groove structure provided in an embodiment of the present application;

[0037] FIG7 is a partial schematic diagram of a hole wall provided in an embodiment of the present application;

[0038] FIG8 is a schematic diagram of the structure of a secondary battery provided in an embodiment of the present application;

[0039] Figure markings: 1-top cover assembly, 2-electrode assembly, 3-shell, 31-accommodating chamber, 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 portion, 22-second pole portion, 211-first body, 212-first extension portion, 221-second body, 222-second extension portion, 201-first side surface, 202-second side surface, 2211-second groove, 30-gap, 301-first gap, 302-second gap, 40-spacer assembly, 401-insulating member, 402-sealing member. Modes for Carrying Out the Invention

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. The described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0041] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0042] Currently, the negative electrode of secondary batteries mainly adopts copper-aluminum friction welding, and vertically distributed components such as plastic, top cover, and sealing ring are generally fastened by the tension of the electrode. This structure has high requirements for the bonding strength of the copper-aluminum composite surface of the negative electrode, and can only use the highly stable but high-cost friction welding process, which means that there is no room for further reduction in the size of the electrode. This leads to higher battery preparation costs and high space utilization limitations.

[0043] Therefore, it is necessary to provide a secondary battery and an electrical device to solve the above problems.

[0044] 1 , 3 and 8 , the secondary battery includes 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 disposed in the receiving cavity 31 ; and 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 spacer 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 arranged in the assembly hole 101, and a gap 30 is formed between the pole 20 and the hole wall 102; the spacer assembly 40 is arranged in the gap 30 and abuts against both 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.

[0045] It can be understood that the hole wall 102 of the assembly hole 101 is inclined relative to the first direction X, so that the assembly hole 101 is a hole with a tapered structure. Since the hole wall 102 of the assembly hole 101 is inclined, 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 the use of 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 inclined relative to the first direction X, so that the side edge of the pole 20 is conical. On the one hand, it can reduce the size of the pole 20 in the first direction X, and on the other hand, it can disperse the force on the pole 20 to a second direction Y perpendicular to the first direction X, that is, the radial direction of the assembly hole; thereby, the spacer assembly 40 distributed along the first direction X is changed to extend along the second direction Y, reducing the overall height of the spacer assembly 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 force, and provide better load dispersion ability.

[0046] In some embodiments, referring to FIG3 , the radial direction along the assembly hole 101 is a second direction Y, which intersects the first direction X. The spacing of the first surfaces 1021 in the second direction Y decreases along the first direction X, while the spacing of the second surfaces 1022 in the second direction Y increases along the first direction X. It is understood that the junction of the first surface 1021 and the second surface 1022 can serve as the boundary between the upper and lower portions of the assembly hole 101, wherein the first surface 1021 surrounds and forms the upper half of the assembly hole 101, and the second surface 1022 surrounds and forms the lower half of the assembly hole 101. When the spacing of the first surfaces 1021 in the second direction Y decreases along the first direction X, while the spacing of the second surfaces 1022 in the second direction Y increases along the first direction X, the assembly hole 101 has a tapered structure with a larger center and smaller sides. This structure can better accommodate the assembly requirements of poles 20 of different sizes and shapes and apply pressure to the surface of the pole 20. It can also increase the contact area with the spacer assembly 40, allowing the spacer assembly to better abut against the gap 30.

[0047] In some embodiments, further referring to FIG. 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 is understood that the angle α can be any value of 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, or 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°, or 170°, or a range between any two values. Not all possible values ​​of α and β are shown in the examples of this embodiment. In other embodiments, the values ​​of α and β may differ from those described above, and the examples in this embodiment do not constitute an undue limitation.

[0048] 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. For example, when in use, the pole 20 is placed in the two-dimensional measuring instrument. The two-dimensional measuring instrument can 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 this application. In other embodiments, other methods can also be used to measure the aforementioned angle α and angle β.

[0049] 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 an excessively small α is avoided during assembly. 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 structure, and the problem of difficulty in forming the pole due to an excessively small β is avoided.

[0050] In some embodiments, further referring to Figure 3, the spacer assembly 40 includes an insulating member 401 and a sealing member 402, a first gap 301 is provided between the first side 201 and the first surface 1021, a second gap 302 is provided between the second side 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 is in contact with both the first surface 1021 and the first side 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 202.

[0051] It is understood that the insulating member 401 may be an upper plastic and the sealing member 402 may be a sealing ring. Since the assembly hole 101 has a conical structure, the upper plastic and the sealing ring can be wrapped and disposed within the gap 30. The insulating member 401 is disposed in the first gap 301 and abuts against both the first surface 1021 and the first side surface 201, respectively, to achieve an insulating effect between the pole 20 and the top cover sheet 10. The sealing member 402 is disposed in the second gap 302 and abuts against both the second surface 1022 and the second side surface 202, thereby achieving a sealing effect between the pole 20 and the top cover sheet 10. Since the insulating member 401 and the sealing member 402 abut against the corresponding surfaces and side surfaces, the insulating member 401 and the sealing member 402 can be adjusted as needed to accommodate different assembly requirements and environmental conditions.

[0052] In some embodiments, further referring to FIG4 , an 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. A 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 is understood that since the gap 30 has a first gap 301 and a second gap 302 that are connected, the insulating member 401 can be disposed in both the first gap 301 and the second gap 302. In this case, the sealing member 402 continues to engage with the lower half of the pole, while 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 of the sealing member 402.

[0053] In some embodiments, further referring to FIG5 , the insulating member 401 is disposed in the first gap 301 and abuts against both the first surface 1021 and the first side surface 201. The sealing member 402 is disposed in the first gap 301 and the second gap 302 and abuts against both the first surface 1021, the first side surface 201, the second surface 1022, and the second side surface 202. It is understood that since the gap 30 has the first gap 301 and the second gap 302 connected, the sealing member 402 can be disposed in both the first gap 301 and the second gap 302. In this case, the insulating member 401 continues to engage with the upper portion of the pole 20, and the sealing member 402 extends from the lower portion to the upper portion of the pole 20, so that the sealing member 402 is hooked by the pole 20, thereby improving the secure assembly and reliable sealing.

[0054] In some embodiments, further referring to FIG6 , a first groove 1023 is provided on the second surface 1022. 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 is understood that the first groove 1023 can provide a better sealing effect. When the sealing member 402 is located in the groove, the recessed shape can closely fit the surface of the sealing member 402. The recessed design can also increase the pressure resistance of the sealing member 402. 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.

[0055] In some embodiments, the first groove 1023 has a bottom surface 1024, which is a flat surface or a circular arc surface. A flat or circular arc bottom surface can provide a larger contact area, making the contact between the seal 402 and the first groove 1023 more uniform, thereby helping to improve the sealing performance between the seal 402 and the first groove 1023. In addition, a flat or circular arc bottom surface can evenly distribute stress, thereby reducing the risk of deformation or damage to the seal 402 or the first groove 1023. Compared with complex shapes, a flat or circular arc bottom surface is easier to process and manufacture, and is also easier to mate with and install with other components.

[0056] In some embodiments, further referring to Figures 2 and 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 first extension portion 212 is connected to the periphery of the first surface 1021 and the second extension portion 222 is connected to the periphery of the first surface 1021, and forms a first side surface 201.

[0057] 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, thereby improving the performance of the pole 20.

[0058] 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 is understood that the provision of the second groove 2211 can save material usage of the pole 20 and further reduce the weight of the pole 20.

[0059] In some embodiments, this embodiment further provides an electrical device, including the secondary battery provided in this embodiment. The electrical device may 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 may be a new energy vehicle, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railway use, such as 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. The embodiments of this application do not impose any special restrictions on the above-mentioned electrical devices.

[0060] The secondary battery and electrical device provided by the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A secondary battery, wherein: include: A housing having a receiving cavity; An electrode assembly, wherein the electrode assembly is disposed 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 includes: 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; 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; A pole, the pole is passed through the assembly hole, and there is a gap between the pole and the hole wall; A spacing component, the spacing component is arranged in the gap and abuts against the hole wall and the pole; 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.

2. The secondary battery according to claim 1, wherein The radial direction along the assembly hole is a second direction, and the second direction intersects with the first direction; the spacing of the first surface in the second direction decreases along the first direction.

3. The secondary battery according to claim 1, wherein A radial direction along the assembly hole is a second direction, the second direction intersects with the first direction, and a spacing between the second surfaces in the second direction increases along the first direction.

4. The secondary battery according to claim 1, wherein A radial direction along the assembly hole is a second direction, and the second direction intersects with the first direction; The pitch of the first surfaces in the second direction decreases along the first direction, and the pitch of the second surfaces in the second direction increases along the first direction.

5. The secondary battery according to claim 1, wherein An angle α is formed between the first surface and the second surface, and the angle α satisfies: 90°≤α<180°.

6. The secondary battery according to claim 1, wherein An angle β is formed between the first side surface and the second side surface, and the angle β satisfies: 90°≤β<180°.

7. The secondary battery according to claim 1, wherein The spacing assembly includes an insulating member and a sealing member, a first gap is formed between the first side surface and the first surface, a second gap is formed between the second side surface and the second surface, and the first gap is connected with the second gap to form the gap; 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.

8. The secondary battery according to claim 1, wherein The spacing assembly includes an insulating member and a sealing member, a first gap is formed between the first side surface and the first surface, a second gap is formed between the second side surface and the second surface, and the first gap is connected with the second gap to form the gap; 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.

9. The secondary battery according to claim 1, wherein The spacing assembly includes an insulating member and a sealing member, a first gap is formed between the first side surface and the first surface, a second gap is formed between the second side surface and the second surface, and the first gap is connected with the second gap to form the gap; 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 first gap and the second gap, and the sealing member abuts against the first surface, the first side surface, the second surface, and the second side surface.

10. The secondary battery according to any one of claims 7 to 9, wherein A first groove is disposed on the second surface. The first groove is recessed in a direction away from the sealing member. At least a portion of the sealing member is located in the first groove.

11. The secondary battery according to claim 10, wherein The groove has a bottom surface, and the bottom surface is a plane.

12. The secondary battery according to claim 10, wherein The groove has a bottom surface, and the bottom surface is an arc surface.

13. The secondary battery according to claim 4, wherein The pole comprises a first pole portion and a second pole portion sequentially arranged along the first direction; 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; the first extension portion forms the second side surface toward the outer periphery of the second surface; 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 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.

14. The secondary battery according to claim 13, wherein 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 direction approaching the first body.

15. An electrical device, wherein: A secondary battery comprising the secondary battery according to any one of claims 1 to 14.

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