Pole and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a pole and a battery. The mounting section is fixedly connected to one end of the limiting section, the size of the outer contour of the mounting section is smaller than that of the outer contour of the limiting section, a sunken part is constructed at the end, away from the limiting section, of the mounting section and is formed by sinking a part of area on the end face of the mounting section towards the direction close to the limiting section, the wall thickness of the sunken part is H, H is larger than or equal to 0.8 mm and smaller than or equal to 3 mm, and H is larger than or equal to 3 mm. And the sunken part is suitable for providing an accommodating space for a tab on the pole group. The sunken part is formed on the end surface of the mounting section to accommodate the pole lug on the pole group, so that the overall height of the pole post and the pole group after being welded can be reduced, the volume utilization rate of the battery is improved, and the wall thickness of the sunken part is limited to be in a range of 0.8-3mm, so that the welding of the mounting section and the welding ring can be ensured, the pole post is fixed, and the mounting efficiency is improved. And the overweight of the pole can be avoided, so that the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a terminal post and a battery. Background Art

[0002] A battery mainly includes a housing, a cover plate and a pole group, etc. Among them, the cover plate is arranged on the opening end of the housing to seal the housing, and the pole group is placed inside the housing and connected to the terminal post on the cover plate through a pole ear.

[0003] Most of the cover plates in the prior art are riveted cover plates. The terminal post of the traditional riveted cover plate is composed of a terminal post terminal and a riveting block. The terminal post terminal is riveted on the cover plate body through the riveting block. There are many parts, the assembly process is complex, the processing cost is high, and the terminal post formed by riveting occupies more space, and the volume utilization rate of the battery is relatively low. Summary of the Utility Model

[0004] In view of this, the utility model provides a terminal post and a battery to solve the problem of relatively low volume utilization rate of the battery.

[0005] In a first aspect, the utility model provides a terminal post, including: a limiting section; an installation section fixedly connected to one end of the limiting section, the outer contour dimension of the installation section is smaller than that of the limiting section, a concave portion is constructed at one end of the installation section away from the limiting section, the concave portion is recessed from a partial area on the end face of the installation section towards the direction close to the limiting section, the wall thickness of the concave portion is H, where 0.8mm ≤ H ≤ 3mm, and the concave portion is suitable for providing a receiving space for the pole ear on the pole group.

[0006] Beneficial Effects: By setting that the terminal post is composed of a limiting section and an installation section and the outer contour of the installation section is smaller than that of the limiting section, it is convenient to insert the installation section into the installation hole on the cover plate. By constructing a concave portion on the end face of the installation section to accommodate the pole ear on the pole group, compared with the traditional terminal post that contacts the pole group through a plane, the terminal post in this embodiment can reduce the overall height after welding the terminal post and the pole group, thereby improving the volume utilization rate of the battery. Moreover, the outer contour of the limiting section is larger than that of the installation section, so that the end area of the limiting section is larger, thereby increasing the contact area between the limiting section and the busbar, that is, increasing the contact area between the terminal post and the busbar, realizing the improvement of the current-carrying capacity of the terminal post, which is beneficial to improving the battery performance. At the same time, by limiting the wall thickness H of the concave portion to take values in the range of 0.8mm to 3mm, it can not only ensure the welding of the installation section and the welding ring to fix the terminal post, but also avoid the excessive weight of the terminal post, thereby reducing the cost as much as possible and ensuring the forming effect.

[0007] In an optional embodiment, the recessed depth of the concave portion is t1, where the value range of t1 is: 0.1mm ≤ t1 ≤ 6mm.

[0008] Beneficial effects: By setting the depression depth t1 of the depression part to be within the range of 0.1 mm to 6 mm, it can not only ensure that the depression part provides enough accommodation space for the tab, and avoid the excessive weight of the terminal post, which is beneficial to improving the volumetric energy density of the battery, but also avoid the excessive height dimension of the terminal post to improve the battery volume utilization rate.

[0009] In an alternative embodiment, the distance between the outer contour of the projection of the mounting section on the limiting section and the outer contour of the limiting section is W, where the value range of W is: 1 mm ≤ W ≤ 5 mm.

[0010] Beneficial effects: By setting the distance W between the outer contour of the projection of the mounting section on the limiting section and the outer contour of the limiting section to be within the range of 1 mm to 5 mm, it can not only ensure that the terminal post has sufficient support strength after being assembled with the cover plate, but also can improve the current-carrying capacity of the terminal post as much as possible, and can also reduce unnecessary material use, avoid excessive material waste, reduce the weight of the terminal post, and reduce the cost of the terminal post.

[0011] In an alternative embodiment, the value range of the thickness t2 of the limiting section is: 0.5 mm ≤ t2 ≤ 4 mm.

[0012] Beneficial effects: By setting the thickness t2 of the limiting section to be within the range of 0.5 mm to 4 mm, it can not only ensure that the limiting section has sufficient strength to compress the sealing ring to improve the sealing performance, but also avoid the excessive weight of the terminal post, thereby reducing the cost.

[0013] In an alternative embodiment, a positioning hole is provided at one end of the limiting section away from the mounting section, and the value range of the diameter of the positioning hole is: 0.5 mm - 4 mm.

[0014] Beneficial effects: By setting the diameter of the positioning hole to be within the range of 0.5 mm - 4 mm, it can not only ensure that the positioning hole has sufficient size to provide positioning for the welding equipment, but also can improve the current-carrying capacity of the terminal post as much as possible.

[0015] In an alternative embodiment, the value range of the depth of the positioning hole is: 0.1 mm - 3 mm.

[0016] Beneficial effects: By setting the depth of the positioning hole to be within the range of 0.1 mm - 3 mm, it can not only ensure that the positioning hole has sufficient size to avoid misjudgment of the positioning of the welding equipment, but also ensure that the terminal post has sufficient structural strength, thereby ensuring the safety of the battery.

[0017] In an alternative embodiment, the cross-section of the limiting section is circular or rectangular or racetrack-shaped.

[0018] Beneficial effects: A circle, a rectangle, and a runway shape are all simple in structure, easy to form, and have good stability.

[0019] In an alternative embodiment, the outer contour of the mounting section is circular, rectangular, or runway-shaped; and / or, the cross-section of the recessed portion is circular, rectangular, or runway-shaped.

[0020] In an alternative embodiment, the material of the pole column is a single metal, or the material of the pole column is a composite metal.

[0021] Beneficial effects: Selecting a single metal is convenient, has a lower cost, and is easy to process. The composite metal has good electrical conductivity, corrosion resistance, a lighter weight, and higher strength, which is beneficial to further improving the performance of the battery.

[0022] In a second aspect, the present utility model further provides a battery, including: a housing provided with an open end; a pole group installed inside the housing; a cover plate assembly provided at the open end of the housing to close the housing. The cover plate assembly includes a cover plate, and an installation hole is provided on the cover plate. The above-mentioned pole column passes through the installation hole through the installation section, and the limiting section of the pole column is located on one side of the cover plate. Since the battery includes a pole column and has the same effects as the pole column, they will not be elaborated here. Description of the Drawings

[0023] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of a pole column according to an embodiment of the present utility model;

[0025] Figure 2 For Figure 1 The schematic structural diagram of the bottom view of the pole column shown;

[0026] Figure 3 For Figure 1 The top view of the pole column shown;

[0027] Figure 4 For Figure 1 The cross-sectional view in the A-A direction in

[0028] Figure 5 It is a schematic structural diagram of another pole column according to an embodiment of the present utility model;

[0029] Figure 6 ForFigure 5 Schematic structural diagram of the bottom view of the pole post shown

[0030] Figure 7 Top view of a cover plate assembly according to an embodiment of the present invention

[0031] Figure 8 is Figure 7 Cross-sectional view taken along the B-B direction in

[0032] Figure 9 is Figure 7 Exploded view of the cover plate assembly shown

[0033] Explanation of reference numerals in the drawings:

[0034] 1. Pole post; 101. Limiting section; 102. Mounting section; 103. Depression; 104. Positioning hole; 2. Cover plate; 201. Mounting hole; 3. Upper plastic; 4. Sealing ring; 5. Welding ring; 6. Lower plastic Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention

[0036] Next, in conjunction with Figures 1 to 9 , the embodiments of the present invention will be described

[0037] According to an embodiment of the present invention, on the one hand, a pole post is provided. As shown in Figures 1 to 6 , the pole post includes a limiting section 101 and a mounting section 102. The mounting section 102 is fixedly connected to one end of the limiting section 101. The size of the outer contour of the mounting section 102 is smaller than the size of the outer contour of the limiting section 101. A depression 103 is formed at one end of the mounting section 102 away from the limiting section 101. The depression 103 is formed by partial areas on the end surface of the mounting section 102 recessing towards the direction close to the limiting section 101. The wall thickness of the depression 103 is H, where 0.8 mm ≤ H ≤ 3 mm. The depression 103 is adapted to provide a receiving space for the pole ear on the pole group. Herein, the wall thickness of the depression 103 refers to the thickness of the solid part on the mounting section 102 corresponding to the depression 103 in the direction perpendicular to the center line of the pole post; the outer contour refers to the outer contour line on the cross-section perpendicular to the center line of the pole post

[0038] It should be noted that the terminal post is installed on the cover plate 2. An installation hole 201 is provided on the cover plate 2. The installation section 102 of the terminal post 1 passes through the installation hole 201. The limiting section 101 is located on one side of the cover plate 2. The surface of the limiting section 101 away from the installation section 102 is used for welding with the busbar. After the installation section 102 passes through the installation hole 201, it is welded and fixed with a welding ring 5. The welding ring 5 is located on the side of the cover plate 2 away from the limiting section 101. One end of the installation section 102 provided with a recess 103 faces the inside of the battery case. The tab on the electrode group inside the case extends into the recess 103 and is electrically connected to the terminal post.

[0039] Applying the terminal post of this embodiment, by setting the terminal post 1 to be composed of a limiting section 101 and an installation section 102 and the outer contour of the installation section 102 is smaller than the outer contour of the limiting section 101, it is convenient to insert the installation section 102 into the installation hole 201 on the cover plate 2. By constructing a recess 103 on the end face of the installation section 102 to accommodate the tab on the electrode group, compared with the traditional terminal post that contacts the electrode group through a plane, the terminal post of this embodiment can reduce the overall height after welding the terminal post and the electrode group, thereby improving the battery volume utilization rate. Moreover, the outer contour of the limiting section 101 is larger than the outer contour of the installation section 102, making the end area of the limiting section 101 larger, so that the contact area between the limiting section 101 and the busbar can be increased, that is, the contact area between the terminal post and the busbar is increased, realizing the improvement of the current-carrying capacity of the terminal post, which is beneficial to improving the battery performance. At the same time, by limiting the wall thickness H of the recess 103 to take values in the range of 0.8 mm to 3 mm, it can not only ensure the welding of the installation section 102 and the welding ring 5 to fix the terminal post 1, but also avoid the excessive weight of the terminal post, thereby reducing the cost as much as possible and ensuring the forming effect.

[0040] Among them, if the wall thickness of the recess 103 is less than 0.8 mm, the thickness of the solid part on the installation section 102 corresponding to the recess 103 is too small and will be melted when welded with the welding ring 5, and it cannot be welded with the welding ring 5; if the wall thickness of the recess 103 is greater than 3 mm, the thickness of the solid part on the installation section 102 corresponding to the recess 103 is too large, resulting in an excessive weight of the terminal post, a higher cost, and a poor stamping forming effect.

[0041] Preferably, the wall thickness H of the recess 103 takes values in the range of 0.9 mm - 1.5 mm, which can further improve the welding reliability between the installation section 102 and the welding ring 5, further reduce the cost, and ensure the forming effect.

[0042] Preferably, the installation section 102 and the limiting section 101 are integrally formed and can be stamped.

[0043] In one embodiment, further combined with Figure 4As shown, the depression depth of the depression part 103 is t1, where the value range of t1 is: 0.1mm ≤ t1 ≤ 6mm. It should be noted that the depression depth of the depression part 103 refers to the distance of depression of the depression part 103 along the extension direction of the center line of the terminal post. Among them, the extension direction of the center line of the terminal post is also along the height direction of the terminal post, that is, along Figure 4 the "up and down" direction indicated by the arrow in Figure 4 . If the depression depth t1 of the depression part 103 is less than 0.1mm, the depression depth is too small, and the accommodation space provided by the depression part 103 for the tab may be insufficient, and the thickness of the solid part of the terminal post corresponding to the depression part 103 in the height direction thereof will be increased accordingly, the weight of the terminal post will be increased, and the overall weight of the battery will be increased, which is not conducive to improving the volume energy density of the battery; if the depression depth t1 of the depression part 103 is greater than 6mm, the depression depth is too large, and in order to ensure that the terminal post can be formed, the height of the terminal post needs to be increased, occupying too much internal space of the battery, resulting in a decrease in the volume utilization rate of the battery. Therefore, by setting the depression depth t1 of the depression part 103 to be within the range of 0.1mm to 6mm, it can not only ensure that the depression part 103 provides sufficient accommodation space for the tab and avoid excessive weight of the terminal post, which is beneficial to improving the volume energy density of the battery, but also avoid too large a height dimension of the terminal post to improve the volume utilization rate of the battery.

[0044] Preferably, the value range of the depression depth t1 of the depression part 103 is 2mm - 4mm, which can further avoid excessive weight of the terminal post 1 while ensuring that the depression part 103 provides accommodation space for the tab, and further ensure the volume energy density and volume utilization rate of the battery.

[0045] In one embodiment, the distance between the outer contour of the projection of the installation section 102 on the limiting section 101 and the outer contour of the limiting section 101 is W, where the value range of W is: 1 mm ≤ W ≤ 5 mm. It should be noted that the outer contour of the limiting section 101 is larger than the outer contour of the installation section 102, and the outer contour of the projection of the installation section 102 on the limiting section 101 is located inside the outer contour of the limiting section 101, that is, on the side of the outer contour of the limiting section 101 facing the direction of its center. The part where the limiting section 101 is larger than the installation section 102 forms an annular flange, and W is the width of the annular ring. This part is used to abut against the cover plate 2 after the pole column is assembled to the cover plate. If W is less than 1 mm, the ring width is too small, and the strength after assembly is insufficient, and the pole column is likely to be deformed or detached from the cover plate 2; the part of the limiting section 101 corresponding to the installation section 102 (that is, the remaining part after removing the flange) is the part where the pole column 1 participates in current conduction. When the outer contour size of the limiting section 101 is determined, the larger the flange size, the smaller the cross-sectional size of the part of the pole column 1 participating in current conduction, which is not conducive to improving the current-carrying capacity of the pole column 1; when the size of the installation section 102 is certain, the larger the flange size, the greater the weight of the pole column and the higher the cost. If W is greater than 5 mm, the flange size is too large, wasting materials, and the pole column is too heavy and the cost is high. Therefore, by setting the distance W between the outer contour of the projection of the installation section 102 on the limiting section 101 and the outer contour of the limiting section 101 to be within the range of 1 mm to 5 mm, it can not only ensure that the pole column 1 has sufficient support strength after being assembled with the cover plate 2, but also can improve the current-carrying capacity of the pole column as much as possible, reduce unnecessary material use, avoid waste of materials, reduce the weight of the pole column, and reduce the cost of the pole column.

[0046] Preferably, the value range of the distance W between the outer contour of the projection of the installation section 102 on the limiting section 101 and the outer contour of the limiting section 101 is 2 mm - 4 mm, which can further reduce the use of materials, reduce the weight of the pole column, and reduce the cost of the pole column on the basis of ensuring that the pole column 1 has sufficient strength.

[0047] In one embodiment, the value range of the thickness t2 of the limiting section 101 is: 0.5 mm ≤ t2 ≤ 4 mm. Wherein, the thickness of the limiting section 101 refers to the dimension along the extension direction of the center line of the limiting section 101, that is, along Figure 4The dimension in the "up and down" direction indicated by the arrow. It should be noted that a upper plastic 3 and a sealing ring 4 are provided between the terminal post 1 and the cover plate 2 to achieve the insulated and sealed connection between the terminal post 1 and the cover plate 2. After the terminal post 1 and the cover plate 2 are assembled, the terminal post 1 compresses the sealing ring 4. If the height of the limiting section 101 is less than 0.5 mm, the height of the limiting section 101 is too small and the strength of the limiting section 101 is insufficient, which affects the compression amount of the sealing ring 4 and thus affects the sealing performance of the battery; if the height of the limiting section 101 is greater than 4 mm, the height of the limiting section 101 is too large, the weight of the terminal post increases, and the cost is relatively high, so it is not recommended to use. Therefore, by setting the thickness t2 of the limiting section 101 to be within the range of 0.5 mm to 4 mm, it can not only ensure that the limiting section 101 has sufficient strength to compress the sealing ring 4 to improve the sealing performance, but also avoid the excessive weight of the terminal post, thereby reducing the cost.

[0048] Preferably, the value range of the thickness t2 of the limiting section 101 is 1 mm - 3 mm, which can further ensure that while the limiting section 101 has sufficient strength to compress the sealing ring 4, the size and weight of the terminal post are not too large, thereby reducing the cost.

[0049] In one embodiment, a positioning hole 104 is provided at one end of the limiting section 101 away from the installation section 102, and the value range of the diameter of the positioning hole 104 is: 0.5 mm - 4 mm. One end of the limiting section 101 away from the installation section 102 is located outside the battery housing and is used to connect with the bus bar. By providing the positioning hole 104 on the limiting section 101, it is convenient for the welding positioning of the terminal post 1 and the bus bar, improving the processing efficiency. If the diameter of the positioning hole 104 is less than 0.5 mm, the size is too small and the hole is not obvious, which is likely to cause misjudgment of the equipment positioning during assembly. If the diameter of the positioning hole 104 is greater than 4 mm, the size of the positioning hole 104 is too large, which will reduce the surface area of the end face of the terminal post 1, thereby affecting the current-carrying capacity of the terminal post. Therefore, by setting the diameter of the positioning hole 104 to be within the range of 0.5 mm to 4 mm, it can not only ensure that the positioning hole 104 has sufficient size to provide positioning for the welding equipment, but also improve the current-carrying capacity of the terminal post 1 as much as possible.

[0050] Preferably, the value range of the diameter of the positioning hole 104 is 1 mm - 3 mm, which can further ensure that while the positioning hole 104 has sufficient size to provide positioning for the welding equipment, the current-carrying capacity of the terminal post 1 is ensured.

[0051] In one embodiment, the value range of the depth of the positioning hole 104 is: 0.1 mm - 3 mm. Among them, the positioning hole 104 is a blind hole, and the depth of the positioning hole 104 refers to the depth of the positioning hole 104 along Figure 4The recessed distance in the "up and down" direction indicated by the arrow. If the depth of the positioning hole 104 is less than 0.1 mm, the size of the positioning hole 104 is too small, the hole is not obvious, and it is easy to cause misjudgment of the positioning of the welding equipment during the welding of the terminal post and the bus bar. If the depth of the positioning hole 104 is greater than 3 mm, the depth dimension of the positioning hole 104 is too large, affecting the structural strength of the terminal post 1. Therefore, by setting the depth of the positioning hole 104 to be within the range of 0.1 mm - 3 mm, it can not only ensure that the positioning hole 104 has a sufficient size to avoid misjudgment of the positioning of the welding equipment, but also ensure that the terminal post has sufficient structural strength, thus ensuring the safety of the battery.

[0052] Preferably, the value range of the depth of the positioning hole 104 is 0.5 mm - 1.5 mm, which can further ensure that the positioning hole 104 has a sufficient size to avoid misjudgment of the positioning of the welding equipment while ensuring that the terminal post 1 has sufficient structural strength.

[0053] Optionally, the cross-section of the limiting section 101 is circular or rectangular or racetrack-shaped; the outer contour of the mounting section 102 is circular or rectangular or racetrack-shaped; the cross-section of the recessed portion 103 is circular or rectangular or racetrack-shaped. The shapes of the limiting section 101, the mounting section 102, and the recessed portion 103 can each be selected from one of circular, rectangular, and racetrack-shaped. There are many choices. Circular, rectangular, and racetrack-shaped all have simple structures, are easy to form, and have good stability.

[0054] In one embodiment, further in combination with Figures 1 to 4 As shown, the shapes of the limiting section 101, the mounting section 102, and the recessed portion 103 are the same, all being rectangular, which is convenient for processing and has relatively high structural strength.

[0055] In addition, in other embodiments, further in combination with Figures 5 to 6 As shown, the shapes of the limiting section 101, the mounting section 102, and the recessed portion 103 are the same, all being circular, with high material utilization rate and convenient processing.

[0056] In addition, in other embodiments (not shown in the figure), the limiting section 101, the mounting section 102, and the recessed portion 103 can be respectively combined with different shapes, and the forming of the terminal post can also be achieved.

[0057] In one embodiment, the material of the terminal post is a single metal, which is convenient for material selection, has a low cost, and is easy to process. Optionally, the material of the terminal post 1 can be pure aluminum or pure copper, etc.

[0058] In addition, in other embodiments, the material of the terminal post is a composite metal. The composite metal has good electrical conductivity, corrosion resistance, light weight, and high strength, which is beneficial to further improving the performance of the battery. Optionally, the composite metal is a copper-aluminum composite metal, and the terminal post is a copper-aluminum composite terminal post.

[0059] The terminal post of this embodiment combines the traditional riveting block and the terminal post of the terminal post to form a single piece, that is, an independent terminal post, which can effectively reduce costs and improve the utilization rate of the battery volume.

[0060] According to an embodiment of the present invention, on the other hand, a battery is further provided, including: a housing, a battery cell group, and a cover plate assembly. The housing is provided with an open end; the battery cell group is installed inside the housing; the cover plate assembly is arranged at the open end of the housing to close the housing. The cover plate assembly includes a cover plate 2, and an installation hole 201 is provided on the cover plate 2. The above-mentioned terminal post 1 is passed through the installation hole 201 through the installation section 102, and the limiting section 101 of the terminal post 1 is located on one side of the cover plate. The structure of the cover plate assembly is as Figures 7 to 9 shown, the cover plate assembly further includes a lower plastic 6, and the lower plastic 6 is arranged on the side of the cover plate 2 away from the limiting section 101.

[0061] Optionally, the battery is a lithium-ion battery.

[0062] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A terminal post, characterized in that, Comprising: A limiting section; An installation section fixedly connected to one end of the limiting section, the outer contour dimension of the installation section being smaller than that of the limiting section. A recess is formed at one end of the installation section away from the limiting section, and the recess is formed by a partial area on the end surface of the installation section recessing towards the direction close to the limiting section. The wall thickness of the recess is H, where 0.8 mm ≤ H ≤ 3 mm, and the recess is adapted to provide a receiving space for the tab on the electrode group.

2. The terminal post according to claim 1, wherein, The recess depth of the recess is t1, where the value range of t1 is: 0.1 mm ≤ t1 ≤ 6 mm.

3. The terminal post according to claim 1, wherein, The distance between the outer contour of the projection of the installation section on the limiting section and the outer contour of the limiting section is W, where the value range of W is: 1 mm ≤ W ≤ 5 mm.

4. The terminal post according to claim 1, wherein, The thickness t2 of the limiting section has a value range of: 0.5 mm ≤ t2 ≤ 4 mm.

5. The terminal post according to claim 1, wherein A positioning hole is provided at one end of the limiting section away from the installation section, and the value range of the diameter of the positioning hole is: 0.5 mm - 4 mm.

6. The terminal post according to claim 5, characterized in that, The value range of the depth of the positioning hole is: 0.1 mm - 3 mm.

7. The pole post according to claim 1, characterized in that, The cross-section of the limiting section is circular or rectangular or racetrack-shaped.

8. The terminal post according to claim 1, wherein The outer contour of the installation section is circular or rectangular or racetrack-shaped; And / or, the cross-section of the recess is circular or rectangular or racetrack-shaped.

9. The terminal post according to any one of claims 1 to 8, characterized in that, The material of the pole column is a single metal, or the material of the pole column is a composite metal.

10. A battery, characterized in that, Comprising: A housing provided with an open end; An electrode group installed inside the housing; A cover plate assembly provided at the open end of the housing to close the housing. The cover plate assembly includes a cover plate, and an installation hole is provided on the cover plate. The pole column according to any one of claims 1 to 9 is passed through the installation hole through the installation section, and the limiting section of the pole column is located on one side of the cover plate.

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