Assembling structure of battery assembly, cylindrical battery and battery module

Abstract

The utility model provides an assembly structure of a battery assembly, a cylindrical battery and a battery module, and relates to the field of batteries. The assembling structure is applied to a battery assembly with a first direction and a second direction which are perpendicular to each other. The pole piece of the battery assembly is connected with the pole column through the tab; the assembly structure comprises a shell and an insulation pad which is provided with a pad body, a folding part and a pole hole, the gasket body is arranged between the tab and the shell along the first direction and is connected with the folding part; the folding part is arranged in the direction, far away from the pole column, of the insulation pad, is folded towards the pole piece side and is in contact with the pole piece and the shell in the second direction; the pole extends in the first direction through the pole hole. By using the assembly structure of the battery assembly provided by the invention, the assembly of the battery assembly is realized, and the manufacturing cost of the battery can be reduced while the assembly yield of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an assembly structure of a battery component, a cylindrical battery and a battery module. Background Art

[0002] The development of the new energy industry is closely related to batteries. Currently, there are roughly three types of battery cell forms in the industry: square batteries, soft-pack batteries, and cylindrical batteries. Studies have shown that large cylindrical batteries are safer than square and soft-pack batteries, can reduce the impact on adjacent cells, and can improve fast charging and battery life. The most important thing is that the production cost is greatly reduced. With the development of the new energy industry, large cylindrical batteries have received widespread attention due to their advantages in shape and volume.

[0003] At present, in the packaging process of cylindrical batteries, a flat gasket is generally used to separate the electrode assembly from the packaging shell. Due to its shape, the flat gasket affects the quality of the overall packaged battery and increases the production cost of the battery. Utility Model Content

[0004] In view of the above problems, the purpose of the embodiments of the present application is to provide an assembly structure of a battery assembly, a cylindrical battery and a battery module. Through the setting of insulating pads, the energy density is maximized, and the assembly accuracy and stability are improved, thereby solving the problems of space waste, assembly accuracy and stability that may be encountered in the battery assembly manufacturing process.

[0005] In the first aspect, an embodiment of the present application provides an assembly structure of a battery assembly, and the assembly structure is applied to a battery assembly having a first direction and a second direction perpendicular to each other; the pole piece of the battery assembly is connected to the pole post through a pole ear; the assembly structure includes: a shell and an insulating gasket having a gasket body, a folded portion and a pole post hole; the gasket body is arranged between the pole ear and the shell along the first direction and is connected to the folded portion; the folded portion is arranged in the direction of the insulating gasket away from the pole post, folded toward the pole piece side, and in contact with the pole piece and the shell in the second direction; the pole extends in the first direction through the pole post hole.

[0006] In the above-mentioned implementation process, the assembly structure of the battery assembly provided in the embodiment of the present application includes an insulating pad and a shell, etc. Due to the folding design of the insulating pad, the folding portion of the insulating pad is folded toward the pole piece side of the battery assembly, which can completely wrap the exposed area of ​​the pole ear, thereby avoiding the contact between the pole ear and the shell, and reducing the process of rubber wrapping the pole ear; and the setting of the folding portion effectively avoids the assembly interference caused by the rounded corners of the shell. Therefore, the use of the assembly structure of the battery assembly provided in the embodiment of the present application can not only improve the assembly yield of the battery, but also reduce the battery manufacturing cost.

[0007] Optionally, in an embodiment of the present application, the folding portion includes a connecting surface and a folding edge; the connecting surface is arranged between the gasket body and the folding edge, and connects the gasket body and the folding edge.

[0008] Optionally, in an embodiment of the present application, the connecting surface is a conical surface.

[0009] In the above implementation process, the embodiment of the present application sets the connecting part as a conical surface, which not only improves the stability and reliability of the assembly, but also can effectively solve the problems that may arise in the assembly process, such as interference, friction, etc., thereby further improving the efficiency and yield of the assembly.

[0010] Optionally, in an embodiment of the present application, the thickness of the folded edge ranges from 0.2 mm to 1 mm.

[0011] In the above implementation process, the thickness range of the folded edge is set within the range of 0.2 mm to 1 mm, which provides greater flexibility and applicability for the assembly structure. The optional thickness within this range can be selected according to the specific assembly needs and the design requirements of the battery assembly to achieve the best assembly effect.

[0012] Optionally, in an embodiment of the present application, the folded edge includes a plurality of raised points; the raised points are arranged on a side of the folded edge close to the shell.

[0013] In the above implementation process, the setting of the raised points of the folded edge plays an important role in fixing the support, reducing the structural size, improving the energy density and ensuring the assembly accuracy, providing key support for improving the performance of the battery assembly.

[0014] Optionally, in an embodiment of the present application, the assembly structure also includes a sealing pin having a first cylinder and a second cylinder along a first direction; the pole includes a first pole ring and a second pole ring; the diameter of the first cylinder is equal to the inner diameter of the first pole ring, and the first cylinder is configured to be clamped in a first cavity formed by the first pole ring; the diameter of the second cylinder is equal to the inner diameter of the second pole ring, and the second cylinder is configured to be clamped in a second cavity formed by the inner wall of the second pole ring; the sealing pin is configured to seal the injection hole.

[0015] In the above-mentioned implementation process, the battery assembly structure provided by the embodiment of the present application includes a sealing pin. When the first cylinder of the sealing pin is clamped in the first cavity formed by the first ring of the pole, the second cylinder is clamped in the second cavity formed by the inner wall of the second ring of the pole; during the sealing process, the sealing pin is exerted with a force to squeeze the center ring, so that the sealing pin is compressed and deformed to form a seal for the injection hole, which can reduce the risk of electrolyte leakage from the injection hole and improve the safety of the cylindrical battery using the assembly structure of the present application during use.

[0016] Optionally, in an embodiment of the present application, the assembly structure further includes an insulating member; the insulating member is sleeved between the shell and the pole to isolate the pole, the insulating pad and the shell.

[0017] In the above implementation process, the assembly structure provided by the embodiment of the application also includes an insulating member sleeved between the shell, the insulating pad and the pole. Through the cooperation of the insulating member, the shell and the pole can be insulated and isolated.

[0018] Optionally, in an embodiment of the present application, the material of the insulating pad includes PP, PI or PPS material.

[0019] In the above implementation process, the material of the insulating pad includes PP, PI or PPS material. PP, polypropylene, is a common plastic material. The insulating pad provided in the present application manufactured with PP as the material has good mechanical properties and chemical stability. PI, polyimide, is a high-performance engineering plastic. The insulating pad provided in the present application manufactured with PI as the material has excellent high temperature resistance, chemical stability and mechanical properties. PPS, polyphenylene sulfide, is a high temperature and chemical corrosion resistant engineering plastic. The insulating pad provided in the present application manufactured with PPS as the material has good stability and better high temperature resistance.

[0020] A second aspect of the present application provides a cylindrical battery, which includes a cylindrical battery assembly and the assembly structure provided by the first aspect of the present application.

[0021] A third aspect of the present application provides a battery module, which includes the cylindrical battery provided in the second aspect of the present application.

[0022] The embodiments of the present application provide an assembly structure of a battery assembly, a cylindrical battery, and a battery module. The assembly structure of the battery assembly includes an insulating pad and a shell. The insulating pad adopts an optional thickness range and a small hemispherical protrusion design. The insulating pad is embedded in the cylindrical shell, and the protrusion design provides a stable support, maximizes space utilization, reduces height waste, and improves energy density. On the other hand, the protrusion design also avoids the concentricity deviation that may occur during the assembly process, and improves the assembly accuracy and stability.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A partial cross-sectional view of a packaged battery assembly provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the package provided in the embodiment of the present application;

[0027] Figure 3 A schematic diagram of the structure of the insulating pad provided in the embodiment of the present application;

[0028] Figure 4 A partial cross-sectional view of an assembly structure without a bare battery cell provided in an embodiment of the present application;

[0029] Figure markings: battery assembly-A; pole ear-a; pole piece-b; pole-c; pole first ring-c1; pole second ring-c2; battery-200; first direction-Z, second direction-C; assembly structure-100; shell-120; insulating gasket-110; gasket body-111; folded portion-112; pole hole-113; connecting surface-1121; folded edge-1122; raised point-1123; sealing pin-130; first cylinder-131; second cylinder-132; insulating member-140; upper insulating member-141; sealing gasket-142; lower insulating member-143. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The development of the new energy industry is closely related to batteries. At present, there are roughly three types of battery cell forms in the industry: square batteries, soft-pack batteries and cylindrical batteries. Studies have shown that large cylindrical batteries are safer than square and soft-pack batteries, can reduce the impact on adjacent cells, can improve fast charging and battery life, and most importantly, greatly reduce production costs. With the development of the new energy industry, large cylindrical batteries have received widespread attention due to their advantages in shape and volume. At present, in the packaging process of cylindrical batteries, flat gaskets are generally used to separate the electrode assembly from the packaging shell.

[0037] During the research, the applicant found that the flat gasket between the current electrode assembly and the shell is fixed between the electrode assembly and the shell by a riveting process. Since the flat gasket is fixed by a riveting process, the shell increases a certain thickness in the height direction, thereby reducing the available space inside the shell; at the same time, due to the tooling gap and assembly error, the concentricity of the flat gasket and the shell may be offset, thereby increasing the defective rate of the product; in addition, since the current flat gasket is basically a flat design, it is impossible to effectively isolate the winding core tab and the shell. In order to prevent the tab from contacting the battery shell, the tab needs to be encapsulated. Since the automation of this process is difficult, the battery production efficiency is affected, and the production cost of the battery is also increased.

[0038] Based on this, the embodiments of the present application provide an assembly structure of a battery assembly, a cylindrical battery and a battery module, wherein an insulating pad is arranged between the pole ear of the battery assembly and the outer shell of the battery assembly, and the setting of the insulating pad can separate the pole ear and the outer shell; and can extend to the outside of the pole piece, contact with the pole piece, and wrap the pole ear, so that there is no need to perform treatment such as encapsulation on the pole ear, thereby reducing the manufacturing cost of the battery.

[0039] Please see Figure 1 , Figure 1 A partial cross-sectional view of an assembled battery provided in an embodiment of the present application; Figure 1 See on the basis of Figure 2 , Figure 2 A schematic diagram of a packaged battery provided in an embodiment of the present application.

[0040] like Figure 2 As shown, the battery assembly A provided in the embodiment of the present application has a first direction Z and a second direction C that are perpendicular to each other. The assembly structure 100 of the battery assembly A provided in the present application is applied to the battery assembly A, and after the structure is adaptively adjusted, it can be used for packaging battery assemblies A of other shapes such as cylindrical batteries, and the battery 200 is formed after packaging.

[0041] Please see Figure 1 The assembly structure 100 provided in the embodiment of the present application includes: a shell 120 and an insulating gasket 110 having a gasket body 111, a folded portion 112 and a pole hole 113.

[0042] The gasket body 111 is disposed between the pole tab a and the housing 120 along the first direction Z and is connected to the folded portion 112 .

[0043] The folded portion 112 is arranged in a direction where the insulating pad 110 is away from the pole c, folded toward the pole piece b, and in contact with the pole piece b and the housing 120 in the second direction C. After packaging, a part of the folded portion 112 exists between the housing 120 and the pole piece b, thereby achieving full wrapping or full coverage of the pole lug a of the battery assembly A.

[0044] The pole c extends toward the first direction Z through the pole hole 113 .

[0045] The battery assembly A is assembled using the assembly structure 100 of the battery assembly A provided in the embodiment of the present application. The insulating pad 110 is sleeved on the pole c of the battery assembly A and is arranged between the outer shell and the pole ear a. The pole c of the battery assembly A extends to the outside of the battery through the pole hole 113 of the insulating pad 110.

[0046] Optionally, the thickness of the insulating pad 110 provided in the embodiment of the present application can be set between 0.5 mm and 1.0 mm, which can be applied to battery assemblies A of different sizes and shapes, maximize the energy density of the battery assemblies A, and ensure the accuracy and stability during the assembly process.

[0047] pass Figure 1 and Figure 2 It can be seen that the assembly structure 100 of the battery component A provided in the embodiment of the present application includes an insulating pad 110 and a shell 120. Due to the folding design of the insulating pad 110, the folding portion 112 of the insulating pad 110 is folded toward the side of the pole piece b of the battery component A, which can completely wrap the exposed area of ​​the pole ear a, avoid the contact between the pole ear a and the shell 120, and reduce the process of rubber wrapping the pole ear a; and the setting of the folding portion 112 effectively avoids the assembly interference caused by the rounded corners of the shell 120. Therefore, the use of the assembly structure 100 of the battery component A provided in the embodiment of the present application can not only improve the assembly yield of the battery, but also reduce the battery manufacturing cost.

[0048] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the insulation pad provided in the embodiment of the present application; the folded portion 112 of the insulation pad 110 provided in the embodiment of the present application includes a connecting surface 1121 and a folded edge 1122.

[0049] like Figure 3 As shown, the connecting surface 1121 is disposed between the gasket body 111 and the folded edge 1122 , and connects the gasket body 111 and the folded edge 1122 .

[0050] Optionally, the connection surface 1121 is set as a conical surface. It is worth noting that the setting of the conical surface enables the connection surface 1121 to better adapt to the gasket body 111 and the folded edge 1122, and can avoid the rounded corners of the shell 120 during assembly, thereby reducing interference and friction during assembly, and improving the smoothness and efficiency of assembly.

[0051] Therefore, the embodiment of the present application sets the connecting portion as a conical surface, which not only improves the stability and reliability of assembly, but also can effectively solve problems that may arise during the assembly process, such as interference, friction, etc., thereby further improving the efficiency and yield of assembly.

[0052] Optionally, the thickness of the flange 1122 ranges from 0.2 mm to 1 mm. Figure 1 It can be seen that a portion of the folded edge 1122 is between the pole piece b and the shell 120 in the first direction Z, and the thickness of the folded edge 1122 is generally set in the range of 0.2mm to 1mm. A thinner folded edge 1122, such as 0.2mm, can provide more flexible bending and folding performance, which is suitable for battery components A of some special shapes or sizes, and can also reduce the amount of material used and reduce manufacturing costs. A thicker folded edge 1122, such as 1mm, can provide greater structural strength and stability, which is suitable for scenarios with high requirements on the strength and stability of the assembly structure 100. A moderate folded edge 1122, such as 0.4mm, 0.6mm, and 0.8mm, can take into account both folding performance and structural strength. Those skilled in the art can select different folded edge thicknesses according to specific needs and the characteristics of the prepared material to achieve different characteristics or performances.

[0053] Therefore, setting the thickness range of the folded edge 1122 to be within the range of 0.2 mm to 1 mm provides greater flexibility and applicability for the assembly structure 100. The optional thickness within this range can be selected according to specific assembly requirements and design requirements of the battery assembly A to achieve the best assembly effect.

[0054] Please continue to see Figure 3 In an optional embodiment, the folded edge 1122 includes a plurality of protruding points 1123 , and the protruding points 1123 are arranged on a side of the folded edge 1122 close to the shell 120 .

[0055] That is, a plurality of protruding points 1123 are provided on the side of the folded edge 1122 contacting the housing 120. Preferably, the plurality of protruding points 1123 are evenly distributed in the circumferential direction of the folded edge 1122.

[0056] The insulating pad 110 is embedded in the shell 120, and the design of the protruding point 1123 provides the insulating pad 110 with an appropriate thickness, minimizing the gap between it and the cylindrical shell 120, thereby maximizing the use of the space of the battery assembly A, reducing the height waste caused by the gap between the insulating pad 110 and the shell 120, and improving the energy density. In other words, the assembly structure 100 of the battery assembly A provided in the embodiment of the present application can improve the energy density of the battery assembly A without changing the external dimensions, so that it can accommodate more battery cells or increase the battery capacity in the same volume.

[0057] Because in the traditional assembly process, the pole c is usually fixed to the shell 120 by riveting or other means. However, in this process, the concentricity deviation between the pole c and the shell 120 may be caused, resulting in a decrease in assembly accuracy and stability. By directly embedding the insulating pad 110 in the cylindrical shell 120, the raised point 1123 provides a stable fixed support, which is a more stable and reliable fixing point, avoiding the concentricity deviation that may occur when the pole c is in direct contact with the shell 120. The alignment and stability between the insulating pad 110 and the cylindrical shell 120 are ensured, thereby ensuring the accuracy and stability of the assembly process, making the battery assembly A more reliable in use.

[0058] Optionally, the protruding point 1123 may be set as a hemispherical protruding point 1123. Preferably, the radius of the hemispherical protrusion may be between 0.1 mm and 1 mm.

[0059] Therefore, the setting of the raised point 1123 of the folded edge 1122 plays an important role in fixing support, reducing structural size, improving energy density and ensuring assembly accuracy, providing key support for the performance improvement of battery assembly A.

[0060] Please see Figure 4 , Figure 4 A partial cross-sectional view of an assembly structure without a bare battery cell provided in an embodiment of the present application; in an optional embodiment, the assembly structure 100 also includes a sealing pin 130 having a first cylinder 131 and a second cylinder 132 along the first direction Z; the pole c includes a first pole ring c1 and a second pole ring c2.

[0061] The diameter of the first cylinder 131 is equal to the inner diameter of the first pole ring c1 , and the first cylinder 131 is configured to be clamped in a first cavity formed by the first pole ring c1 .

[0062] The diameter of the second cylinder 132 is equal to the inner diameter of the second circular ring c2 of the pole, and the second cylinder 132 is configured to be clamped in a second cavity formed by the inner wall of the second circular ring c2 of the pole.

[0063] The sealing pin 130 is configured to seal the injection hole.

[0064] It can be seen that the battery assembly structure 100 provided in the embodiment of the present application includes a sealing pin 130. When the first cylinder 131 of the sealing pin 130 is clamped in the first cavity formed by the first circular ring c1 of the pole, the second cylinder 132 is clamped in the second cavity formed by the inner wall of the second circular ring c2 of the pole; during the sealing process, the sealing pin 130 is applied with a force to squeeze the central circular ring, so that the sealing pin 130 is compressed and deformed to form a seal for the injection hole, which can reduce the risk of electrolyte leakage from the injection hole and improve the safety of the cylindrical battery using the assembly structure 100 of the present application during use.

[0065] Please continue to see Figure 4 The assembly structure 100 further includes an insulating member; the insulating member is sleeved between the shell 120 and the pole c to isolate the pole c, the insulating pad 110 and the shell 120.

[0066] In some possible embodiments, the insulating member includes an upper insulating member 141, a sealing gasket 142 and a lower insulating member 143; the upper insulating member 141 may be made of hard plastic material, the sealing gasket 142 may be made of electrolyte-resistant rubber material such as EPDM rubber, and the lower insulating member 143 may be made of soft plastic material such as PET; wherein the sealing gasket 142 is an interference fit to ensure sealing, and during the assembly process, the pole is pressed downward to compress the upper insulating member 141, the sealing gasket 142 and the lower insulating member 143. wherein the sealing gasket 142 may also be replaced by a support ring to support the pole.

[0067] It can be seen that the assembly structure 100 provided in the embodiment of the present application also includes an insulating member sleeved between the shell 120, the insulating pad 110 and the pole c. Through the cooperation of the insulating member, the shell 120 and the pole c can be insulated and isolated.

[0068] In an optional embodiment, the material of the insulating pad 110 includes PP, PI or PPS material.

[0069] PP, polypropylene, is a common plastic material. The insulating pad 110 provided in the present application manufactured with PP as the material has good mechanical properties and chemical stability. PI, polyimide, is a high-performance engineering plastic. The insulating pad 110 provided in the present application manufactured with PI as the material has excellent high temperature resistance, chemical stability and mechanical properties. PPS, polyphenylene sulfide, is a high temperature resistant and chemical corrosion resistant engineering plastic. The insulating pad 110 provided in the present application manufactured with PPS as the material has good stability and better high temperature resistance.

[0070] The cylindrical battery of the second aspect of the present application comprises the assembly structure 100 of the battery assembly of the first aspect and a cylindrical battery assembly. The cylindrical battery has at least all the beneficial effects brought by the technical solution of the assembly structure embodiment of the battery assembly.

[0071] The battery module power battery module of the third aspect of the present application includes the cylindrical battery of the second aspect, and also has at least all the beneficial effects brought about by the technical solution of the assembly structure embodiment of the above-mentioned battery assembly.

[0072] In summary, the assembly structure of the battery assembly provided in the embodiment of the present application effectively reduces the height waste caused by the gap between the insulating pad and the shell by embedding the insulating pad in the cylindrical shell and adopting a small hemispherical protrusion design, thereby maximizing the use of the space of the battery assembly. And it is possible to increase the energy density of the battery assembly without changing the external dimensions. The stable support of the folded edge protrusion design of the insulating pad avoids the concentricity deviation that may occur in the traditional assembly process, ensures the alignment and stability between the insulating pad and the cylindrical shell, thereby improving the accuracy and stability of the assembly process, making the battery assembly more reliable during the assembly process.

[0073] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery assembly assembly structure, characterized in that: The assembly structure is applied to a battery assembly having a first direction and a second direction perpendicular to each other; the pole piece of the battery assembly is connected to the pole via a pole ear; the assembly structure comprises: a shell and an insulating gasket having a gasket body, a folded portion and a pole hole; The gasket body is disposed between the pole lug and the housing along the first direction and is connected to the folded portion; The folding portion is arranged in a direction where the insulating pad is away from the pole, folded toward the pole piece, and in contact with the pole piece and the housing in the second direction; The pole extends toward the first direction through the pole hole.

2. The assembly structure according to claim 1, characterized in that: The folding portion includes a connecting surface and a folding edge; The connecting surface is arranged between the gasket body and the folded edge, and connects the gasket body and the folded edge.

3. The assembly structure according to claim 2, characterized in that: The connecting surface is a conical surface.

4. The assembly structure according to claim 2, characterized in that: The thickness of the folded edge ranges from 0.2 mm to 1 mm.

5. The assembly structure according to claim 2, characterized in that: The folded edge includes a plurality of raised points; The protruding point is arranged on a side of the folded edge close to the shell.

6. The assembly structure according to claim 1, characterized in that: The assembly structure further comprises a sealing nail having a first cylinder and a second cylinder along the first direction; the pole comprises a first pole ring and a second pole ring; The diameter of the first cylinder is equal to the inner diameter of the first circular ring of the pole, and the first cylinder is configured to be clamped in a first cavity formed by the first circular ring of the pole; The diameter of the second cylinder is equal to the inner diameter of the second circular ring of the pole, and the second cylinder is configured to be clamped in a second cavity formed by the inner wall of the second circular ring of the pole; The sealing nail is configured to seal the liquid injection hole.

7. The assembly structure according to claim 6, characterized in that: The assembly structure also includes an insulating member; The insulating member is sleeved between the shell and the pole to isolate the pole, the insulating pad and the shell.

8. The assembly structure according to claim 1, characterized in that: The material of the insulating pad includes PP, PI or PPS material.

9. A cylindrical battery, characterized in that: The cylindrical battery comprises: a cylindrical battery assembly and an assembly structure as described in any one of claims 1-8.

10. A battery module, characterized in that: The battery module includes the cylindrical battery according to claim 9.

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