Pole, pole structure and battery

Abstract

The utility model provides a pole, a pole structure and a battery, the pole comprises a first pole part and a second pole part, the first pole part comprises a first end and a second end which are axially distributed, the periphery of the first pole part is convexly provided with a first flange, and the first flange and the second end are spaced in the axial direction; an embedding groove is formed in one end of the second pole part along the axial direction, and the first end is positioned in the embedding groove and is connected with the second pole part in an embedding manner; a second flange is convexly arranged on the periphery of the second pole part, an interval is formed between one end, far away from the first pole, of the second pole and the second flange in the axial direction, the second flange is provided with a first connecting groove, and at least part of the first flange is located in the first connecting groove and is connected with the second flange in an embedded manner. According to the pole provided by the embodiment of the invention, the binding force between the first pole part and the second pole part can be improved, so that the technical problem that the first pole part and the second pole part of the pole are easy to separate is solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pole, a pole structure and a battery. Background Art

[0002] In related art, battery terminals are often formed by stamping together copper and aluminum materials to achieve better electrical performance. However, this method of stamping copper and aluminum together results in low bonding strength between the copper and aluminum surfaces, making them susceptible to separation, which in turn affects the electrical performance of the terminal. Utility Model Content

[0003] The embodiments of the present application provide a pole, a pole structure, and a battery, which can improve the technical problem that when poles are connected together using different materials, the bonding force between the different materials is low, separation occurs easily, and the electrical performance of the pole is affected.

[0004] In a first aspect, an embodiment of the present application provides a pole, comprising:

[0005] The first pole portion includes a first end and a second end distributed in an axial direction, a first flange is protruded from the outer periphery of the first pole portion, and a gap is formed between the first flange and the second end in the axial direction;

[0006] The second pole portion has an engaging groove at one end along the axial direction, the first end is located in the engaging groove and is engaged with the second pole portion; a second flange is protruded from the outer periphery of the second pole portion, in the axial direction, an end of the second pole away from the first pole is spaced from the second flange, the second flange has a first connecting groove, the first flange is at least partially located in the first connecting groove and is engaged with the second flange.

[0007] In one embodiment, the second flange includes a connecting portion and an undercut portion that enclose the first connecting groove, the connecting portion is protruding from the outer periphery of the second pole portion, the first flange is located on one side of the connecting portion along the direction from the first end to the second end, and the undercut portion is covered on the end of the first flange portion away from the axis of the first pole portion.

[0008] In one embodiment, one end of the undercut portion is connected to the connecting portion, and the other end of the undercut portion extends to a side of the first flange away from the connecting portion.

[0009] 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 undercut portion in the protruding direction of the second flange is d, wherein when c>h1, d≥2 / 3c; when c≤h1, d≥0.5mm.

[0010] In one embodiment, the first flange includes a first embedded portion located between the undercut portion and the connecting portion, and a thickness of the first embedded portion in the axial direction is b, where b is ≥ 0.5 mm.

[0011] In one embodiment, the thickness of the second flange in the axial direction is h1, and the thickness of the undercut portion in the axial direction is h2, wherein h2 / h1≥30%.

[0012] In one embodiment, a second connecting groove is formed on a side of the first flange facing the second flange;

[0013] The second flange includes a connecting portion and a second embedded portion that enclose the connecting groove, the connecting portion is protruding from the outer periphery of the second pole portion, the first flange is located on one side of the connecting portion along the direction from the first end to the second end, and the second embedded portion is located in the second connecting groove.

[0014] In one embodiment, the thickness of the second flange in the axial direction is h1, and the width of the second connecting groove in the protruding direction of the first flange is e, wherein h1>e≥0.5 mm.

[0015] In one embodiment, the second pole portion includes a first interlocking layer located at one end away from the first pole portion, and a second interlocking layer located on the outer periphery of the first pole portion, the first interlocking layer and the second interlocking layer enclose the interlocking groove, and the thickness of the first interlocking layer and the second interlocking layer are both greater than or equal to 0.5 mm.

[0016] In one embodiment, a side of the second pole portion facing away from the first pole portion is recessed to form a recessed groove, and a depth of the recessed groove is greater than or equal to 1.2 mm.

[0017] In one embodiment, a step groove is formed on the outer circumference of the second pole portion. The step groove is located at an end of the second pole portion away from the first pole portion and extends along the circumference of the second pole portion.

[0018] In one embodiment, the depth of the step groove is L1, L1 ≥ 0.4 mm; the width of the step groove in the axial direction is L2, L2 ≥ 0.5 mm.

[0019] In one embodiment, the first pole portion is made of aluminum; and the second pole portion is made of copper.

[0020] In a second aspect, an embodiment of the present application provides a pole structure, including:

[0021] The pole is the pole as described above, the pole comprising a first pole portion and a second pole portion, the first pole portion comprising a first end and a second end distributed in an axial direction, a first flange protruding from the outer periphery of the first pole portion, and a gap between the first flange and the second end in the axial direction; an engaging groove is provided at one end of the second pole portion in the axial direction, the first end is located in the engaging groove and is engaged with the second pole portion; a second flange is protruding from the outer periphery of the second pole portion, and a gap is formed between the end of the second pole away from the first pole and the second flange in the axial direction, the second flange is provided with a first connecting groove, the first flange is at least partially located in the first connecting groove and is engaged with the second flange;

[0022] an insulating member, sleeved on the outer circumference of the pole, the insulating member comprising a receiving groove, the first flange and the second flange of the pole being located in the receiving groove;

[0023] The welding ring is sleeved on the outer circumference of the insulating member.

[0024] In a fourth aspect, an embodiment of the present application provides a battery comprising the top cover assembly as described above.

[0025] Beneficial effects of the embodiments of the present application:

[0026] In an embodiment of the present application, an interlocking groove is provided at one end of the second pole portion along the axial direction, so that the first end of the first pole portion is located in the interlocking groove and is interlocked and connected with the second pole portion. The second pole portion can cover the first end of the first pole portion to increase the bonding surface between the first pole portion and the second pole portion, which is beneficial to improving the connection stability between the first pole portion and the second pole portion while reducing the interface resistance between the first pole portion and the second pole portion.

[0027] On this basis, a first flange is protruded from the outer periphery of the first pole portion, so that the first flange is spaced axially from the second end of the first pole. Simultaneously, a second flange is protruded from the outer periphery of the second pole portion, so that the end of the second pole away from the first pole is spaced axially from the second flange. A first connecting groove is formed in the second flange, so that the first and second flanges can be brought closer together. When the first end of the first pole portion is located in the fitting groove and fitted with the second pole portion, the first flange is at least partially located in the first connecting groove and fitted with the second flange, thereby improving the bonding force between the first and second pole portions and alleviating the technical problem of the first and second pole portions of the pole being easily separated. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 1 is a schematic structural diagram of an embodiment of a pole provided in an embodiment of the present application;

[0030] Figure 2 for Figure 1 Cross-sectional view along AA direction;

[0031] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 A cross-sectional view of another embodiment of a pole provided in an embodiment of the present application, wherein the cross-sectional view is parallel to the axial direction of the pole;

[0033] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0034] Figure 6 A schematic structural diagram of an embodiment of a pole structure provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the exploded structure of an embodiment of the pole structure provided in the embodiment of the present application;

[0036] Figure 8 A cross-sectional view of another embodiment of a pole provided in an embodiment of the present application, wherein the cross-sectional view is parallel to the axial direction of the pole;

[0037] Figure 9 for Figure 8 Enlarged view of point C in the middle.

[0038] 1. Top cover assembly; 10. Pole structure; 11. Pole; 111. First pole portion; 1111. First end; 1112. Groove; 1113. Second end; 1114. First flange; 1115. First embedded portion; 1116. Second connecting groove; 112. Second pole portion; 1121. Fitting groove; 1122. First fitting layer; 1123. Sink; 1124. Second fitting layer; 1125. Second flange; 1126. First connecting groove; 1127. Connecting portion; 1128. Undercut portion; 1129. Second embedded portion; 114. Step groove; 12. Insulator; 121. Accommodating groove; 13. Welding ring; 115. Slot. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, 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 work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0040] In related art, battery terminals are often formed by stamping together copper and aluminum materials to achieve better electrical performance. However, this method of stamping copper and aluminum together results in low bonding strength between the copper and aluminum surfaces, making them susceptible to separation, which in turn affects the electrical performance of the terminal.

[0041] In order to improve the above problems, embodiments of the present application provide a pole, a pole structure, a top cover assembly, and a battery.

[0042] Figure 1 A schematic structural diagram of an embodiment of a pole provided in an embodiment of the present application. Figure 2 for Figure 1 The cross-sectional view along the AA direction. Figure 1 and Figure 2 As shown, the pole 11 includes a first pole portion 111 and a second pole portion 112, which are connected. The first pole portion 111 includes a first end 1111 and a second end 1113 distributed along the axial direction. The second pole portion 112 is provided with an interlocking groove 1121 at one axial end. The first end 1111 of the first pole portion 111 is located in the interlocking groove 1121 and is interlocked with the second pole portion 112, thereby connecting the first pole portion 111 and the second pole portion 112 together.

[0043] The electrode 11 can be either a negative electrode or a positive electrode. When used in a battery, the first electrode portion 111 of the electrode 11 is connected to a busbar, thereby electrically connecting the battery to the busbar. The second electrode portion 112 is connected to a connecting piece (not shown), which is used to connect to the battery's tab, thereby electrically connecting the battery's core to the electrode 11.

[0044] Furthermore, the material of the first pole portion 111 can be different from the material of the second pole portion 112. Specifically, the material of the first pole portion 111 can be the same as that of the busbar, and the material of the second pole portion 112 can be the same as that of the connecting piece, to improve the electrical performance of the pole 11. Specifically, the material of the first pole portion 111 can be aluminum, and the material of the second pole portion 112 can be copper.

[0045] In some embodiments, as Figure 3 As shown, a first flange 1114 can be provided protrudingly on the outer periphery of the first pole portion 111. In the axial direction of the first pole portion 111, the first flange 1114 is spaced apart from the second end 1113. Simultaneously, a second flange 1125 can be provided protrudingly on the outer periphery of the second pole portion 112. In the axial direction of the first pole portion 111, the end of the second pole 11 away from the first pole 11 is spaced apart from the second flange 1125. Furthermore, a first connecting groove 1126 is defined in the second flange 1125. When the first end 1111 of the first pole portion 111 is located in the fitting groove 1121 and is fitted and connected to the second pole portion 112, the first flange 1114 is at least partially located within the first fitting groove 1126 and is fitted and connected to the second flange 1125.

[0046] The pole 11 provided in the embodiment of the present application is provided with an interlocking groove 1121 at one end of the second pole portion 112 along the axial direction of the first pole portion 111, so that the first end 1111 of the first pole portion 111 is located in the interlocking groove 1121 and is interlocked and connected with the second pole portion 112. The second pole portion 112 can cover the first end 1111 of the first pole portion 111, so as to improve the bonding surface between the first pole portion 111 and the second pole portion 112, which is beneficial to improving the connection stability between the first pole portion 111 and the second pole portion 112 while reducing the interface resistance between the first pole portion 111 and the second pole portion 112.

[0047] On this basis, a first flange 1114 is protruded from the outer periphery of the first pole portion 111 , so that a gap exists between the first flange 1114 and the second end 1113 of the first pole 11 in the axial direction of the first pole portion 111 . At the same time, a second flange 1125 is protruded from the outer periphery of the second pole portion 112, so that there is a gap between the end of the second pole 11 away from the first pole 11 and the second flange 1125 in the axial direction of the first pole portion 111, and a first connecting groove 1126 is opened on the second flange 1125, which can make the first flange 1114 and the second flange 1125 close to each other. When the first end 1111 of the first pole portion 111 is located in the fitting groove 1121 and is fitted and connected to the second pole portion 112, the first flange 1114 is at least partially located in the first connecting groove 1126 and is fitted and connected to the second flange 1125, thereby improving the bonding force between the first pole portion 111 and the second pole portion 112 and reducing the risk of separation between the first pole portion 111 and the second pole portion 112 of the pole 11.

[0048] In some embodiments, as Figure 3 As shown, the second flange 1125 of the second pole portion 112 can include a connecting portion 1127 and an undercut portion 1128 that enclose and form a first connecting groove 1126. The connecting portion 1127 of the second flange 1125 is protruding from the outer periphery of the second pole portion 112. The first flange 1114 is located on one side of the connecting portion 1127 along the direction from the first end 1111 to the second end 1113 of the first pole portion 111. The undercut portion 1128 covers the end of the first flange 1114 away from the axis of the first pole portion 111. By having the undercut portion 1128 of the second flange 1125 cover the end of the first flange 1114 away from the axis of the first pole portion 111, the fit strength between the first flange 1114 and the second flange 1125 is improved, further reducing the risk of separation between the first pole portion 111 and the second pole portion 112.

[0049] Among them, one end of the undercut portion 1128 of the second flange 1125 can be connected to the connecting portion 1127, and the other end of the undercut portion 1128 can be extended to the side of the first flange 1114 away from the connecting portion 1127, so as to further improve the covering effect of the undercut portion 1128 on the first flange 1114, so as to make the connection between the first flange 1114 and the second flange 1125 more stable.

[0050] Continue to refer to Figure 3The thickness of second flange 1125 in the axial direction of first pole portion 111 is h1, the height of second flange 1125 along its protruding direction is c, and the height of undercut portion 1128 in the protruding direction of second flange 1125 is d. When c>h1, d can be set to ≥ 2 / 3c, thereby increasing the strength of undercut portion 1128 and the fit strength between first flange 1114 and second flange 1125. The ratio of d to c can be 0.7, 0.8, 0.9, etc., depending on the structure of first flange 1114 and second flange 1125.

[0051] When c ≤ h1, d ≥ 0.5 mm can be used to increase the strength of undercut portion 1128 and enhance the fit between first flange 1114 and second flange 1125. d can be 0.6 mm, 0.7 mm, 0.8 mm, etc., depending on the structure of first flange 1114 and second flange 1125.

[0052] In addition, if Figure 3 As shown, the thickness of the undercut portion 1128 in the axial direction of the first pole portion 111 is h2. The ratio h2 / h1 can be ≥ 30%, thereby maximizing the size of the undercut portion 1128 and increasing its strength, thereby further improving the fit between the first flange 1114 and the second flange 1125. The ratio of h2 to h1 can be 40%, 50%, 70%, etc., depending on the structure of the first flange 1114 and the second flange 1125.

[0053] Continue to refer to Figure 3 The first flange 1114 includes a first embedded portion 1115 located between the undercut portion 1128 and the connecting portion 1127. The thickness b of the first embedded portion 1115 in the axial direction of the first pole portion 111 is set to be 0.6 mm, 0.7 mm, 0.8 mm, etc., depending on the structure of the first flange 1114 and the second flange 1125.

[0054] In other embodiments, Figure 4 and Figure 5As shown, the second flange 1125 can include a connecting portion 1127 and a second embedded portion 1129 that enclose a first connecting groove 1126. The connecting portion 1127 is protruding from the outer periphery of the second pole portion 112. The first flange 1114 is located on one side of the connecting portion 1127 along a direction from the first end 1111 to the second end 1113 of the first pole portion 111. When the first end 1111 of the first pole portion 111 is located in the embedding groove 1121 and is embedded and connected to the second pole portion 112, the first flange 1114 is at least partially located within the first connecting groove 1126 enclosed by the connecting portion 1127 and the second embedded portion 1129 of the second flange 1125.

[0055] A second connecting groove 1116 may be defined on the side of the first flange 1114 facing the second flange 1125. The second connecting groove 1116 is located at an end of the first flange 1114 away from the first pole portion 111. Furthermore, the second embedding portion 1129 of the second flange 1125 may be located in the second connecting groove 1116, thereby further enhancing the connection strength between the first flange 1114 and the second flange 1125.

[0056] In some embodiments, continue to refer to Figure 5 The thickness of the second flange 1125 in the axial direction of the first pole portion 111 is h1, and the width of the second connecting groove 1116 in the extending direction of the first flange 1114 is e, wherein h1>e≥0.5mm can be made, so that the first flange 1114 and the second flange 1125 have a higher bonding strength, thereby improving the connection stability between the first pole portion 111 and the second pole portion 112.

[0057] like Figure 2 As shown, the second pole portion 112 includes a first interlocking layer 1122 located at one end away from the first pole portion 111, and a second interlocking layer 1124 located on the periphery of the first pole portion 111. The first interlocking layer 1122 and the second interlocking layer 1124 enclose a interlocking groove 1121, wherein the thickness of the first interlocking layer 1122 and the second interlocking layer 1124 can be greater than or equal to 0.5 mm to improve the strength and welding performance of the second pole portion 112. The thickness of the first interlocking layer 1122 and the second interlocking layer 1124 can be the same or different. The thickness of the first interlocking layer 1122 and the second interlocking layer 1124 can be 0.6 mm, 0.7 mm, or 0.8 mm, which is not limited here.

[0058] In addition, if Figure 2As shown, the side of the second pole portion 112 facing away from the first pole portion 111 can be recessed to form a recessed groove 1123, with a depth of greater than or equal to 1.2 mm, to reduce the weight of the second pole 11. The depth of the recessed groove 1123 can be 1.3 mm, 1.5 mm, 1.6 mm, etc., depending on the structure of the pole 11.

[0059] Specifically, a groove 1112 is formed in the end surface of the first end 1111 of the first pole 11, thereby increasing the area of ​​the joint surface between the first pole portion 111 and the second pole portion 112. The groove 1112 corresponds to the position of the recessed groove 1123, so that the thickness of the first interlocking layer 1122 of the second pole portion 112 is kept as uniform as possible, while facilitating the formation of the recessed groove 1123 on the side of the second interlocking layer 1124 facing away from the first pole portion 111.

[0060] In some embodiments, as Figure 8 and Figure 9 As shown, a stepped groove 114 can be formed on the outer periphery of the second pole portion 112. The stepped groove 114 is located at one end of the second pole portion 112 away from the first pole portion 111 and extends along the circumference of the second pole portion 112. Therefore, when the pole 11 is welded to the connecting piece, the connecting piece can be embedded in the stepped groove 114 to quickly position the connecting piece and the second pole portion 112 of the pole 11.

[0061] The depth of the step groove 114 is L1, and the width of the step groove 114 in the axial direction of the first pole portion 111 is L2. The depth L1 of the step groove 114 can be ≥ 0.5 mm, and the width L2 of the step groove 114 in the axial direction of the first pole portion 111 can be ≥ 0.4 mm, so that the connecting piece can be accurately embedded in the step groove 114. The depth of the step groove 114 can be 0.6 mm, 0.7 mm, or 0.8 mm. The width of the step groove 114 in the axial direction of the first pole portion 111 can be 0.5 mm, 0.6 mm, or 0.7 mm.

[0062] Specifically, a welding hole can be formed in the connecting piece, with the side of the second pole portion 112 facing away from the first pole portion 111 being located in the welding hole, and the edge of the welding hole being accommodated in the stepped groove 114 of the second pole 11, so that the connecting piece is embedded in the stepped groove 114 and the position of the connecting piece and the pole 11 is relatively stable. Afterwards, the second pole portion 112 of the pole 11 and the connecting piece can be welded together.

[0063] In some embodiments, the first pole portion 111 and the second pole portion 112 can be joined together by cold heading and stamping, thereby achieving a high bonding strength between the first pole portion 111 and the second pole portion 112. Similarly, the first flange 1114 and the second flange 1125 can also be joined together by cold heading and stamping, thereby achieving a high bonding strength between the first flange 1114 and the second flange 1125 and facilitating processing.

[0064] In addition, the first pole portion 111 and the second pole portion 112 may be waist-shaped or racetrack-shaped structures, so that the pole 11 has higher torsional strength.

[0065] An embodiment of the present application also provides a pole structure, which includes a pole. The specific structure of the pole refers to the above embodiment. Since this pole structure adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0066] like Figure 6 and Figure 7 As shown, the pole structure 10 may include a pole 11, an insulating member 12, and a welding ring 13. The structure of the pole 11 can be referred to in the above-mentioned embodiments and will not be further described here. The insulating member 12 is sleeved around the outer periphery of the pole 11 and includes a receiving groove 121. The first flange 1114 and the second flange 1125 are located within the receiving groove 121. The welding ring 13 is sleeved around the outer periphery of the insulating member 12. This allows the pole structure 10 to have a standard terminal structure, which helps improve the assembly efficiency of the pole structure 10 and the top cover.

[0067] An embodiment of the present application also provides a battery, which includes a pole structure. The specific structure of the pole structure refers to the above embodiment. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0068] Among them, the battery can include a shell, an electrode assembly and a pole structure 10, the electrode assembly is installed in the shell, the pole structure is installed in the shell and electrically connected to the electrode assembly, and the pole structure can refer to the above embodiments and will not be repeated here.

[0069] The above is a detailed introduction to the embodiments of the present application. 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, based on the ideas 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 a limitation on the present application.

Claims

1. A pole, characterized in that: include: The first pole portion includes a first end and a second end distributed in an axial direction, a first flange is protruded from the outer periphery of the first pole portion, and a gap is formed between the first flange and the second end in the axial direction; The second pole portion has an engaging groove at one end along the axial direction, the first end is located in the engaging groove and is engaged with the second pole portion; a second flange is protruded from the outer periphery of the second pole portion, in the axial direction, an end of the second pole away from the first pole is spaced from the second flange, the second flange has a first connecting groove, the first flange is at least partially located in the first connecting groove and is engaged with the second flange.

2. The pole according to claim 1, characterized in that The second flange includes a connecting portion and an undercut portion that enclose the first connecting groove, the connecting portion protruding from the outer periphery of the second pole portion, the first flange is located on one side of the connecting portion along the direction from the first end to the second end, and the undercut portion covers the end of the first flange portion away from the axis of the first pole portion.

3. The pole according to claim 2, characterized in that One end of the undercut portion is connected to the connecting portion, and the other end of the undercut portion extends to a side of the first flange away from the connecting portion.

4. The pole according to claim 3, characterized in that 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 undercut portion in the protruding direction of the second flange is d, wherein when c>h1, d≥2 / 3c; when c≤h1, d≥0.5mm.

5. The pole according to claim 3, characterized in that The first flange includes a first embedded portion located between the undercut portion and the connecting portion. The thickness of the first embedded portion in the axial direction is b, and b≥0.5 mm.

6. The pole according to claim 3, characterized in that The thickness of the second flange in the axial direction is h1, and the thickness of the undercut portion in the axial direction is h2, wherein h2 / h1≥30%.

7. The pole according to claim 1, characterized in that A second connecting groove is formed on a side of the first flange facing the second flange; The second flange includes a connecting portion and a second embedded portion that enclose the connecting groove, the connecting portion is protruding from the outer periphery of the second pole portion, the first flange is located on one side of the connecting portion along the direction from the first end to the second end, and the second embedded portion is located in the second connecting groove.

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

9. The pole according to any one of claims 1 to 8, characterized in that The second pole portion includes a first embedding layer located at one end away from the first pole portion, and a second embedding layer located on the outer periphery of the first pole portion. The first embedding layer and the second embedding layer enclose the embedding groove, and the thickness of the first embedding layer and the second embedding layer are both greater than or equal to 0.5 mm.

10. The pole according to any one of claims 1 to 8, characterized in that A side of the second pole portion facing away from the first pole portion is recessed to form a recessed groove, and a depth of the recessed groove is greater than or equal to 1.2 mm.

11. The pole according to any one of claims 1 to 8, characterized in that A step groove is formed on the outer circumference of the second pole portion. The step groove is located at one end of the second pole portion away from the first pole portion and extends along the circumference of the second pole portion.

12. The pole according to claim 11, characterized in that The depth of the step groove is L1, L1≥0.4mm; the width of the step groove in the axial direction is L2, L2≥0.5mm.

13. The pole according to any one of claims 1 to 8, characterized in that The first pole portion is made of aluminum; the second pole portion is made of copper.

14. A pole structure, characterized in that: include: A pole, wherein the pole is the pole according to any one of claims 1 to 13; an insulating member, sleeved on the outer circumference of the pole, the insulating member comprising a receiving groove, the first flange and the second flange of the pole being located in the receiving groove; The welding ring is sleeved on the outer circumference of the insulating member.

15. A battery, characterized in that: The invention comprises a shell, an electrode assembly and the pole structure as claimed in claim 14, wherein the electrode assembly is installed in the shell, and the pole structure is installed in the shell and electrically connected to the electrode assembly.

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