Polar poles, polar pole structure, and battery

Abstract

This application provides a pole column, a pole column structure, and a battery, the pole column comprising a first pole column portion 111 and a second pole column portion 112, the first pole column portion comprising a first end 1111 and a second end 1113 distributed along the axial direction, a first flange 1114 protruding from the outer circumference of the first pole column portion, with a gap between the first flange and the second end in the axial direction. A fitting groove 1121 is provided at one end of the second pole column portion along the axial direction, the first end is located in the fitting groove and fitted and connected to the second pole column portion. A second flange 1125 protruding from the outer circumference of the second pole column portion, with a gap between the second end of the second pole column, away from the first pole column, and the second flange in the axial direction, a first connecting groove is provided in the second flange, at least a portion of the first flange is located in the first connecting groove and fitted and connected to the second flange. [Effect] The pole column of this invention improves the bonding force between the first pole column portion and the second pole column portion, thereby improving the technical problem of the first pole column portion and the second pole column portion being easily separated.

Description

Technical Field

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[0001] This application claims the priority of a Chinese utility model application with the application number 202422195807.7 filed with the Chinese Patent Office on September 6, 2024, and incorporates all the contents described in that application.

[0002] This application relates to the field of battery technology, specifically to pole posts, pole post structures, and batteries.

Background Art

[0003] In related technologies, the pole post of a battery is usually formed by connecting copper and aluminum materials through pressing to improve the electrical performance of the pole post. However, when using such a connection method of copper and aluminum materials by pressing, the bonding force of the bonding surface between the copper and aluminum materials is relatively low, and the copper and aluminum materials are likely to separate, which may affect the electrical performance of the pole post.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The embodiments of this application provide a pole post, a pole post structure, and a battery, thereby improving the technical problem that in a pole post connected by different materials, the bonding force between different materials is relatively low and prone to separation, which affects the electrical performance of the pole post.

Means for Solving the Problems

[0005] As a first aspect, the embodiments of this application provide a pole post, and the pole post is a first pole post part including a first end and a second end distributed along the axial direction, a first flange is convexly provided on the outer periphery of the first pole post part, and the first flange and the second end have a gap in the axial direction, and the first pole post part The second pole column portion includes a fitting groove provided at one end along the axial direction, the first end located in the fitting groove and fitted and connected to the second pole column portion, a second flange protruding from the outer circumference of the second pole column portion, the second flange and one end of the second pole column away from the first pole column having a gap in the axial direction, a first connecting groove being opened in the second flange, and at least a portion of the first flange located in the first connecting groove and fitted and connected to the second flange.

[0006] In one embodiment, the second flange includes a connecting portion and a curved portion that surround and form the first connecting groove, the connecting portion is provided as a protrusion on the outer circumference of the second pole column, the first flange is located on one side of the connecting portion in the direction from the first end to the second end, and the curved portion covers the end of the first flange portion that is away from the axis of the first pole column.

[0007] In one embodiment, one end of the curved portion is connected to the connecting portion, and the other end of the curved portion extends to the opposite side of the first flange from the connecting portion.

[0008] In one embodiment, the thickness of the second flange in the axial direction is h1, the height of the second flange in its protruding direction is c, and the height of the curved portion in the protruding direction of the second flange is d, where if c > h1, d ≥ 2 / 3c, and if c ≤ h1, d ≥ 0.5 mm.

[0009] In one embodiment, the first flange includes a first fitting portion located between the curved portion and the connecting portion, wherein the axial thickness of the first fitting portion is b, and b ≥ 0.5 mm.

[0010] In one embodiment, the axial thickness of the second flange is h1, and the axial thickness of the curved portion is h2, where h2 / h1 ≥ 30%.

[0011] In one embodiment, a second connecting groove is provided on the side of the first flange facing the second flange.

[0012] The second flange includes a connecting portion and a second fitting portion that surround and form the connecting groove, the connecting portion is provided as a protrusion on the outer circumference of the second pole column, the first flange is located on one side of the connecting portion in the direction from the first end to the second end, and the second fitting portion is located in the second connecting groove.

[0013] In one embodiment, the axial thickness of the second flange is h1, and the width of the second connecting groove in the direction of projection of the first flange is e, where h1 > e ≥ 0.5 mm.

[0014] In one embodiment, the second pole column portion includes a first fitting layer located on one side of the first pole column portion and a second fitting layer located on the outer circumference of the first pole column portion, the first fitting layer and the second fitting layer surround each other to form the fitting groove, and the thickness of both the first fitting layer and the second fitting layer is 0.5 mm or more.

[0015] In one embodiment, a recessed groove is formed on the side of the second pole column opposite to the first pole column, and the groove depth of the recessed groove is 1.2 mm or more.

[0016] In one embodiment, a stepped groove is provided on the outer circumference of the second pole column, and the stepped groove is located at one end of the second pole column opposite to the first pole column and extends along the circumferential direction of the second pole column.

[0017] In one embodiment, the depth of the stairwell is L1, where L1 ≥ 0.4 mm. The width of the stairwell in the axial direction is L2, where L2 ≥ 0.5 mm.

[0018] In one embodiment, the material of the first pole column is aluminum, and the material of the second pole column is copper.

[0019] In a second aspect, the embodiment of the present application provides a pole column structure, the pole column structure is, The pole column described above includes a first pole column portion and a second pole column portion, the first pole column portion includes a first end and a second end distributed along the axial direction, a first flange is provided on the outer circumference of the first pole column portion, there is a gap between the first flange and the second end in the axial direction, a fitting groove is provided on one end of the second pole column portion along the axial direction, the first end is located in the fitting groove and fitted and connected to the second pole column portion, a second flange is provided on the outer circumference of the second pole column portion, there is a gap between one end of the second pole column away from the first pole column and the second flange in the axial direction, a first connecting groove is provided in the second flange, at least a part of the first flange is located in the first connecting groove and fitted and connected to the second flange, An insulating component is fitted over the outer circumference of the pole post, includes a housing groove, and the first flange and second flange of the pole post are located within the housing groove. The system includes a welding ring placed over the outer circumference of the aforementioned insulating component.

[0020] In a fourth aspect, an embodiment of the present application provides a battery, the battery including a cover assembly. [Effects of the Invention]

[0021] In the embodiment of the present invention, a fitting groove is provided at one end of the second pole column along the axial direction, so that the first end of the first pole column is positioned in the fitting groove and fitted and connected to the second pole column. As a result, the second pole column covers the first end of the first pole column, improving the coupling surface between the first and second pole column, improving the stability of the connection between the first and second pole column, and reducing the interfacial resistance between the first and second pole column.

[0022] Moreover, a first flange is protrudingly provided on the outer periphery of the first pole column portion, so that the first flange and the second end of the first pole column have a gap in the axial direction. At the same time, a second flange is protrudingly provided on the outer periphery of the second pole column portion, so that one end of the second pole column, which is away from the first pole column, and the second flange have a gap in the axial direction. Further, a first connection groove is formed in the second flange, so that the first flange and the second flange can approach each other. When the first end of the first pole column portion is located in the fitting groove and is fitted and connected to the second pole column portion, at least a part of the first flange is located in the first connection groove and is fitted and connected to the second flange. Thereby, the bonding force between the first pole column portion and the second pole column portion is improved, and thus the technical problem that the first pole column portion and the second pole column portion of the pole column are likely to separate is improved.

Brief Description of the Drawings

[0023] To more clearly explain the technical solution in the embodiment of the present application, the drawings used in the description of the embodiment are briefly described below. Obviously, the drawings in the following description are only part of the embodiments of the present application. For those skilled in the art, other drawings can also be obtained from these drawings without inventive efforts.

[0024] [Figure 1] It is a schematic diagram showing the structure of an embodiment related to the pole column provided in the embodiment of the present application. [Figure 2] It is a cross-sectional view taken along the A-A direction in FIG. 1. [Figure 3] It is an enlarged view of part A in FIG. 2. [Figure 4] It is a cross-sectional view of another embodiment related to the pole column provided in the embodiment of the present application, where the cross-section is parallel to the axial direction of the pole column. [Figure 5] It is an enlarged view of part B in FIG. 4. [Figure 6] It is a schematic diagram showing the structure of an embodiment related to the pole column structure provided in the embodiment of the present application. [Figure 7] It is a schematic diagram showing the exploded structure of an embodiment related to the pole column structure provided in the embodiment of the present application. [Figure 8]This is a cross-sectional view of another embodiment relating to the pole column provided in the embodiment of the present application, where the cross-section is parallel to the axial direction of the pole column. [Figure 9] This is a magnified view of section C in Figure 8. [Modes for carrying out the invention]

[0025] The technical concepts in the embodiments of this application will be described clearly and completely below, with reference to the drawings of the embodiments. Clearly, the embodiments described are only a selection of the embodiments of this application, not all of them. All other embodiments that a person skilled in the art could obtain based on the embodiments of this application without creative effort are included within the scope of this application. Furthermore, it should be understood that the specific embodiments described herein are for illustrative and interpretive purposes only, and not limiting, this application. In this application, unless otherwise stated, directional terms used, such as “up” and “down,” generally refer to the top and bottom of the device in its actual use or operating state, and specifically to the direction in the drawings. On the other hand, “inside” and “outside” are expressions relative to the contour of the device.

[0026] In related technologies, the electrode posts of batteries are usually formed by joining copper and aluminum materials through press forming to improve their electrical performance. However, using this method of joining copper and aluminum materials by press forming results in relatively low bonding strength at the joint surface between the copper and aluminum materials, making them prone to separation, which may in turn affect the electrical performance of the electrode posts.

[0027] To address the above issues, embodiments of the present invention provide a pole, a pole structure, a cover assembly, and a battery.

[0028] Figure 1 is a schematic diagram showing the structure of one embodiment of a pole column provided in an embodiment of the present application. Figure 2 is a cross-sectional view along the AA direction in Figure 1. As shown in Figures 1 and 2, the pole column 11 includes a first pole column portion 111 and a second pole column portion 112, and the first pole column portion 111 is connected to the second pole column portion 112. The first pole column portion 111 includes a first end 1111 and a second end 1113 distributed along the axial direction, and a fitting groove 1121 is provided at one end of the second pole column portion 112 along the axial direction, and the first end 1111 of the first pole column portion 111 is located in the fitting groove 1121 and is fitted and connected to the second pole column portion 112, thereby connecting the first pole column portion 111 and the second pole column portion 112 to each other.

[0029] Here, the pole 11 may be a negative pole 11 or a positive pole 11. When the pole 11 is used in a battery, the first pole portion 111 of the pole 11 is used to connect to a busbar, thereby electrically connecting the battery to the busbar. The second pole portion 112 is used to connect to a connecting sheet (not shown), and the connecting sheet is used to connect to the pole tabs of the battery, thereby electrically connecting the winding core of the battery to the pole 11.

[0030] Furthermore, the materials of the first pole column 111 and the second pole column 112 may be different. Here, the material of the first pole column 111 and the busbar may be the same, and the material of the second pole column 112 and the connecting sheet may be the same, thereby improving the electrical performance of the pole column 11. Specifically, the material of the first pole column 111 may be aluminum, and the material of the second pole column 112 may be copper.

[0031] In some embodiments, as shown in Figure 3, a first flange 1114 may be provided protruding from the outer circumference of the first pole column 111, and there is a gap between the first flange 1114 and the second end 1113 in the axial direction of the first pole column 111. At the same time, a second flange 1125 is provided protruding from the outer circumference of the second pole column 112, and there is a gap between the second end of the second pole column 11 away from the first pole column 11 and the second flange 1125 in the axial direction of the first pole column 111, and a first connecting groove 1126 is provided in the second flange 1125. When the first end 1111 of the first pole column 111 is located in the fitting groove 1121 and fitted and connected to the second pole column 112, at least a portion of the first flange 1114 is located in the first connecting groove 1126 and fitted and connected to the second flange 1125.

[0032] According to the pole column 11 provided in the embodiment of the present application, a fitting groove 1121 is provided at one end of the second pole column portion 112 that is aligned with the axial direction of the first pole column portion 111. As a result, the first end 1111 of the first pole column portion 111 is positioned in the fitting groove 1121 and fitted and connected to the second pole column portion 112. This causes the second pole column portion 112 to cover the first end 1111 of the first pole column portion 111, improving the coupling surface between the first pole column portion 111 and the second pole column portion 112, improving the stability of the connection between the first pole column portion 111 and the second pole column portion 112, and contributing to reducing the interfacial resistance between the first pole column portion 111 and the second pole column portion 112.

[0033] Furthermore, a first flange 1114 is provided protruding from the outer circumference of the first pole column 111, so that the first flange 1114 and the second end 1113 of the first pole column 11 are spaced apart in the axial direction of the first pole column 111. At the same time, a second flange 1125 is provided protruding from the outer circumference of the second pole column 112, so that one end of the second pole column 11 away from the first pole column 11 and the second flange 1125 are spaced apart in the axial direction of the first pole column 111. In addition, a first connecting groove 1126 is provided in the second flange 1125, so that the first flange 1114 and the second flange 1125 can move closer to each other. When the first end 1111 of the first pole column portion 111 is located in the fitting groove 1121 and fitted and connected to the second pole column portion 112, at least a portion of the first flange 1114 is located in the first connecting groove 1126 and fitted and connected to the second flange 1125. This improves the bonding force between the first pole column portion 111 and the second pole column portion 112, and reduces the risk of separation of the first pole column portion 111 and the second pole column portion 112 of the pole column 11.

[0034] In some embodiments, as shown in Figure 3, the second flange 1125 of the second pole column 112 may include a connecting portion 1127 and a curved portion 1128 that surround it and form a first connecting groove 1126. Here, the connecting portion 1127 of the second flange 1125 is convex on the outer circumference of the second pole column 112, the first flange 1114 is located on one side of the connecting portion 1127 in the direction from the first end 1111 to the second end 1113 of the first pole column 111, and the curved portion 1128 covers the end of the first flange 1114 that is away from the axis of the first pole column 111. The curved portion 1128 of the second flange 1125 covers the end of the first flange 1114 that is away from the axis of the first pole column 111, thereby increasing the fitting strength between the first flange 1114 and the second flange 1125 and further reducing the risk of separation between the first pole column 111 and the second pole column 112.

[0035] Here, one end of the curved portion 1128 of the second flange 1125 is connected to the connecting portion 1127, and the other end of the curved portion 1128 may extend to the opposite side of the first flange 1114 from the connecting portion 1127. This further improves the covering effect of the curved portion 1128 over the first flange 1114 and makes the connection between the first flange 1114 and the second flange 1125 more stable.

[0036] Continuing to refer to Figure 3, the thickness of the second flange 1125 in the axial direction of the first pole portion 111 is h1, the height of the second flange 1125 in its protruding direction is c, and the height of the curved portion 1128 in the protruding direction of the second flange 1125 is d. Here, if c > h1, then d ≥ 2 / 3c may also be the case, which gives the curved portion 1128 higher strength, and consequently the fitting strength between the first flange 1114 and the second flange 1125 is higher. The ratio of d to c may be 0.7, 0.8, 0.9, etc., and may be set specifically according to the structure of the first flange 1114 and the second flange 1125.

[0037] If c ≤ h1, d ≥ 0.5 mm may also be the case, which gives the curved portion 1128 higher strength, and consequently, the fitting strength between the first flange 1114 and the second flange 1125 is higher. d may also be 0.6 mm, 0.7 mm, 0.8 mm, etc., and may be set specifically according to the structure of the first flange 1114 and the second flange 1125.

[0038] Furthermore, as shown in Figure 3, the thickness of the curved portion 1128 in the axial direction of the first pole column portion 111 is h2, and h2 / h1 may be ≥ 30%, thereby increasing the dimensions of the curved portion 1128 as much as possible, thereby increasing the strength of the curved portion 1128, and consequently further increasing the fitting strength between the first flange 1114 and the second flange 1125. Here, the ratio of h2 to h1 may be 40%, 50%, 70%, etc., and may be set specifically according to the structure of the first flange 1114 and the second flange 1125.

[0039] Continuing to refer to Figure 3, the first flange 1114 includes a first fitting portion 1115 located between the curved portion 1128 and the connecting portion 1127. The thickness of the first fitting portion 1115 in the axial direction of the first pole column portion 111 is b, where b ≥ 0.5 mm. This increases the strength of the first fitting portion 1115 and, consequently, the fitting strength between the first flange 1114 and the second flange 1125. The thickness b of the first fitting portion 1115 in the axial direction of the first pole column portion 111 may be 0.6 mm, 0.7 mm, 0.8 mm, etc., and may be specifically set according to the structure of the first flange 1114 and the second flange 1125.

[0040] In other embodiments, as shown in Figures 4 and 5, the second flange 1125 includes a connecting portion 1127 and a second fitting portion 1129 that surround and form a first connecting groove 1126, and the connecting portion 1127 may protrude from the outer circumference of the second pole column 112. The first flange 1114 is located on one side of the connecting portion 1127 in the direction from the first end 1111 to the second end 1113 of the first pole column 111. When the first end 1111 of the first pole column 111 is located in the fitting groove 1121 and fitted and connected to the second pole column 112, at least a portion of the first flange 1114 is located within the first connecting groove 1126 formed by the connecting portion 1127 and the second fitting portion 1129 of the second flange 1125.

[0041] Here, a second connecting groove 1116 may be made on the side of the first flange 1114 facing the second flange 1125, and this second connecting groove 1116 is located at the end of the first flange 1114 away from the first pole portion 111. At the same time, the second fitting portion 1129 of the second flange 1125 may be located in the second connecting groove 1116, thereby further increasing the connection strength between the first flange 1114 and the second flange 1125.

[0042] In some embodiments, referring again to Figure 5, the thickness of the second flange 1125 in the axial direction of the first pole column 111 is h1, and the width of the second connecting groove 1116 in the protruding direction of the first flange 1114 is e, where h1 > e ≥ 0.5 mm. This results in a relatively high bonding strength between the first flange 1114 and the second flange 1125, and consequently improves the stability of the connection between the first pole column 111 and the second pole column 112.

[0043] As shown in Figure 2, the second pole column portion 112 includes a first fitting layer 1122 located on one side of the first pole column portion 111 and a second fitting layer 1124 located on the outer circumference of the first pole column portion 111, with the first fitting layer 1122 and the second fitting layer 1124 surrounding each other to form a fitting groove 1121. Here, the thicknesses of both the first fitting layer 1122 and the second fitting layer 1124 may be 0.5 mm or more, thereby improving the strength and welding performance of the second pole column portion 112. Here, the thicknesses of the first fitting layer 1122 and the second fitting layer 1124 may be the same or different. The thicknesses of the first fitting layer 1122 and the second fitting layer 1124 may be 0.6 mm, 0.7 mm, or 0.8 mm, and are not limited thereto.

[0044] Furthermore, as shown in Figure 2, a recessed groove 1123 may be formed on the side of the second pole column 112 opposite to the first pole column 111, with a groove depth of 1.2 mm or more, thereby reducing the weight of the second pole column 11. Here, the groove depth of the recessed groove 1123 may be 1.3 mm, 1.5 mm, 1.6 mm, etc., and may be set specifically according to the structure of the pole column 11.

[0045] Specifically, a recessed groove 1112 is formed on the end face of the first end 1111 of the first pole column 11, thereby increasing the surface area of ​​the joint between the first pole column portion 111 and the second pole column portion 112. Here, the positions of the recessed groove 1112 and the recessed groove 1123 correspond, which helps to keep the thickness of the first fitting layer 1122 of the second pole column portion 112 as uniform as possible, and makes it easier to form the recessed groove 1123 on the side of the second fitting layer 1124 opposite to the first pole column portion 111.

[0046] In some embodiments, as shown in Figures 8 and 9, a stepped groove 114 may be opened on the outer circumference of the second pole column 112, and the stepped groove 114 is located at one end of the second pole column 112 opposite to the first pole column 111 and extends in the circumferential direction of the second pole column 112. This allows the connecting sheet to be fitted into the stepped groove 114 when the pole column 11 is welded to the connecting sheet, enabling quick positioning of the connecting sheet and the second pole column 112 of the pole column 11.

[0047] Here, the depth of the stairwell 114 is L1, and the width of the stairwell 114 in the axial direction of the first pole column 111 is L2. The depth of the stairwell 114 may be set to L1 ≥ 0.5 mm, and the width of the stairwell 114 in the axial direction of the first pole column 111 may be set to L2 ≥ 0.4 mm, which makes it easier to accurately fit the connecting sheet into the stairwell 114. The depth of the stairwell 114 may be specifically 0.6 mm, 0.7 mm, or 0.8 mm. The width of the stairwell 114 in the axial direction of the first pole column 111 may be specifically 0.5 mm, 0.6 mm, or 0.7 mm.

[0048] Specifically, a welding hole is made in the connecting sheet, and the welding hole is located on the second pole column portion 112 on the opposite side from the first pole column portion 111, with the edge of the welding hole being housed within the stepped groove 114 of the second pole column 11. This allows the connecting sheet to be fitted into the stepped groove 114, stabilizing the relative positions of the connecting sheet and the pole column 11. Subsequently, the second pole column portion 112 of the pole column 11 and the connecting sheet may be welded together using a welding method.

[0049] In some embodiments, the first pole column 111 and the second pole column 112 may be fitted together by cold forging and press working, thereby providing a relatively high bonding strength between the first pole column 111 and the second pole column 112. Similarly, the first flange 1114 and the second flange 1125 may also be fitted together by cold forging and press working, thereby providing a relatively high bonding strength between the first flange 1114 and the second flange 1125, while also making the manufacturing process very easy.

[0050] Furthermore, the first pole column section 111 and the second pole column section 112 may be made into a waist-shaped or runner-shaped structure, thereby giving the pole column 11 relatively high torsional strength.

[0051] Embodiments of the present application further provide a pole column structure, which includes a pole column, and the specific structure of the pole column may be described by the above embodiments. Since the pole column structure utilizes all the technical solutions of all the above embodiments, it has at least all the effects of the inventions of the above embodiments, and therefore the explanation is omitted here.

[0052] As shown in Figures 6 and 7, the pole post structure 10 may include a pole post 11, an insulating component 12, and a welding ring 13. The structure of the pole post 11 may be described by referring to the above embodiment, and will not be explained here. The insulating component 12 is placed over the outer circumference of the pole post 11, the insulating component 12 includes a housing groove 121, the first flange 1114 and the second flange 1125 are located within the housing groove 121, and the welding ring 13 is placed over the outer circumference of the insulating component 12. This makes the pole post structure 10 a standard terminal structure and contributes to improving the assembly efficiency of the pole post structure 10 and the cover.

[0053] Embodiments of the present application further provide a battery including a pole column structure, the specific structure of which may be described by the above embodiments. Since this battery utilizes all the technical solutions of all the above embodiments, it has at least all the effects of the inventions of the above embodiments, and therefore its description is omitted here.

[0054] Here, the battery includes a housing, an electrode assembly, and a pole structure 10, the electrode assembly being mounted inside the housing, and the pole structure being mounted on the housing and electrically connected to the electrode assembly. The pole structure may be described by referring to the above embodiment, and will not be described here.

[0055] Although embodiments of the present application have been described in detail above, this specification uses specific examples to describe the principles and embodiments of the present application, and the descriptions of the above embodiments are intended solely to aid in understanding the method and core idea of ​​the present application. Furthermore, those skilled in the art will know that specific embodiments and scopes of application can be modified based on the idea of ​​the present application, and therefore, the descriptions in this specification should not be construed as limiting the present application. [Explanation of symbols]

[0056] 1: Cover Assembly 10: Polar column structure 11: Polar pillar 111:First pole part 1111: 1st end 1112: Groove 1113: 2nd end 1114: First flange 1115: 1st inset part 1116: Second connecting groove 112:Second pole column part 1121: Fitting groove 1122: First interlocking layer 1123: Submerged trench 1124: Second interlocking layer 1125: Second flange 1126: First connecting groove 1127: Connection part 1128: Curved section 1129:Second inset part 114: Stair tank 12: Insulating components 121: Storage groove 13: Welding ring

Claims

1. A first pole column portion, including a first end and a second end distributed along the axial direction, wherein a first flange is provided protruding from the outer circumference of the first pole column portion, and the first flange and the second end are spaced apart in the axial direction, A second pole column portion, having a fitting groove at one end along the axial direction, the first end positioned in the fitting groove and fitted and connected to the second pole column portion, a second flange protruding from the outer circumference of the second pole column portion, with a gap between the end of the second pole column away from the first pole column and the second flange in the axial direction, a first connecting groove being opened in the second flange, and at least a portion of the first flange positioned within the first connecting groove and fitted and connected to the second flange, including the second pole column portion. Polar pillar.

2. The second flange includes a connecting portion and a curved portion that surround and form the first connecting groove, the connecting portion protruding from the outer circumference of the second pole column, the first flange is located on one side of the connecting portion in the direction from the first end to the second end, and the curved portion covers the end of the first flange that is away from the axis of the first pole column. The pole column according to claim 1.

3. One end of the curved portion is connected to the connecting portion, and the other end of the curved portion extends to the opposite side of the first flange from the connecting portion. The pole column according to claim 2.

4. The thickness of the second flange in the axial direction is h1, the height of the second flange in its protruding direction is c, and the height of the curved portion in the protruding direction of the second flange is d, where if c > h1, then d ≥ 2 / 3c, and if c ≤ h1, then d ≥ 0.5 mm. The pole post according to claim 3.

5. The first flange includes a first fitting portion located between the curved portion and the connecting portion, wherein the axial thickness of the first fitting portion is b, and b ≥ 0.5 mm. The pole post according to claim 3.

6. The thickness of the second flange in the axial direction is h1, and the thickness of the curved portion in the axial direction is h2, where h2 / h1 ≥ 30%. The pole post according to claim 3.

7. A second connecting groove is provided on the side of the first flange facing the second flange. The second flange includes a connecting portion and a second fitting portion that surround and form the connecting groove, the connecting portion is provided as a protrusion on the outer circumference of the second pole column, the first flange is located on one side of the connecting portion in the direction from the first end to the second end, and the second fitting portion is located in the second connecting groove. The pole column according to claim 1.

8. The thickness of the second flange in the axial direction is h1, and the width of the second connecting groove in the direction of projection of the first flange is e, where h1 > e ≥ 0.5 mm. The pole post according to claim 7.

9. The second pole column portion includes a first fitting layer located on one side of the first pole column portion and a second fitting layer located on the outer circumference of the first pole column portion, the first fitting layer and the second fitting layer surround each other to form the fitting groove, and the thickness of both the first fitting layer and the second fitting layer is 0.5 mm or more. A pole column according to any one of claims 1 to 8.

10. A recessed groove is formed on the side of the second pole column opposite to the first pole column, and the groove depth of the recessed groove is 1.2 mm or more. A pole column according to any one of claims 1 to 8.

11. A stepped groove is provided on the outer circumference of the second pole column, and the stepped groove is located at one end of the second pole column opposite to the first pole column and extends along the circumferential direction of the second pole column. A pole column according to any one of claims 1 to 8.

12. The depth of the step tub is L1, where L1 ≥ 0.4 mm, and the width of the step tub in the axial direction is L2, where L2 ≥ 0.5 mm. The pole column according to claim 11.

13. The material of the first pole column is aluminum, and the material of the second pole column is copper. A pole column according to any one of claims 1 to 8.

14. A pole column according to any one of claims 1 to 8, An insulating component is fitted over the outer circumference of the pole post, includes a housing groove, and the first flange and second flange of the pole post are located within the housing groove. The insulating component includes a welding ring placed over its outer circumference, Polar column structure.

15. The invention comprises a housing, an electrode assembly, and a pole column structure according to claim 14, wherein the electrode assembly is mounted inside the housing, and the pole column structure is mounted inside the housing and electrically connected to the electrode assembly. battery.

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