Lead structure and battery

Abstract

A lead member, comprising a terminal post connection section and a tab connection section. The terminal post connection section has a first segment and a second segment connected to each other, the width of the first segment being less than the width of the second segment. The tab connection section is bent and connected to a side of the first segment along the width direction thereof, and is spaced apart from the second segment. Along the extension direction of the terminal post connection section, opposing sides of the tab connection section and the second segment transition smoothly.

Description

Pin structure and battery

[0001] This application claims priority to Chinese Patent Application No. 202422895091.1, filed with the Chinese Patent Office on November 26, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to a pin component and a battery. Background Technology

[0003] In related technologies, the electrode post and the tab of the core package are electrically connected by a lead member. Typically, the lead member is fabricated into a complex shape (e.g., L-shape) and bent to give it greater spatial compatibility, facilitating the connection of the electrode post and tab at different spatial locations, thereby achieving electrical connection between the tab and the electrode post. Invention Overview

[0004] However, the pin components of this structure have corners, especially at the inner corners, where stress concentration occurs, making the pin components prone to cracking and affecting their structural strength and current carrying capacity.

[0005] This application provides a pin component, which includes a terminal connection segment and a tab connection segment. The terminal connection segment has a first segment and a second segment connected to each other, the width of the first segment being smaller than the width of the second segment; the tab connection segment is bent and connected to one side of the first segment along its width direction, and is spaced apart from the second segment, and the tab connection segment and the second segment smoothly transition on opposite sides along the extending direction of the terminal connection segment.

[0006] In one possible implementation, the opposite sides of the tab connecting section and the second section define an arc-shaped transition section, and the transition is smooth through the arc-shaped transition section. The orthographic projection of the arc-shaped transition section along the thickness direction of the pole connecting section is an arc.

[0007] In one possible implementation, the orthographic projection of the arcuate transition section along the thickness direction of the pole connecting segment is an arc.

[0008] In one possible implementation, the radius of the arc is R, which satisfies 1mm≤R≤3mm.

[0009] In one possible implementation, the tab connecting segment includes a main body segment and a bent segment, the tab connecting segment being bent and connected to a first segment via the bent segment, the main body segment being connected to the end of the bent segment away from the first segment, and the bent segment and the second segment having a smooth transition on opposite sides.

[0010] In one possible implementation, the main body segment includes a first straight segment, a second straight segment, and a connecting segment, wherein the first straight segment is connected to the end of the bent segment away from the first segment, the connecting segment is connected to the end of the first straight segment away from the bent segment, and the second straight segment is connected to the end of the connecting segment away from the first straight segment.

[0011] The first segment is disposed opposite to the connecting segment, and the first segment, the bent segment, the first straight segment and the connecting segment define an avoidance groove.

[0012] In one possible implementation, both the first straight section and the bent section smoothly transition along the sides near the second section.

[0013] In one possible implementation, the first straight section has a first side surface near the second section, and the orthographic projection of the first side surface along the thickness direction of the tab connecting section is a concave arc.

[0014] In one possible implementation, the width of the first straight section gradually increases from the middle to both ends along the extending direction of the tab connection segment.

[0015] In one possible implementation, the second section is provided with pole mounting holes.

[0016] In one possible implementation, the pole mounting hole includes a first hole segment and a second hole segment, the second hole segment being closer to the tab connection segment than the first hole segment, and the cross-sectional area of ​​the first hole segment being larger than the cross-sectional area of ​​the second hole segment, so as to form a step between the first hole segment and the second hole segment.

[0017] This application also provides a battery that includes pin components of any of the above-described possible implementations. Beneficial effects

[0018] In one possible implementation of this application, the electrode connection segment includes a first segment and a second segment. The first segment connects the second segment to the electrode connection segment. The narrower first segment uses less material, which helps to meet lightweight design requirements, while the wider second segment facilitates connection to the electrode. By making the opposite sides of the electrode connection segment and the second segment smoothly transition, the stress distribution in the connection area on the opposite sides of the electrode connection segment and the second segment is more uniform, thereby improving the technical problem of stress concentration at the inner corner of the lead component causing cracking. Attached Figure Description

[0019] Figure 1 is a perspective view of the pin component provided in an embodiment of this application from a first perspective;

[0020] Figure 2 is a perspective view of the pin component provided in the embodiment of this application from a second perspective.

[0021] Figure 3 is a front view of the pin component provided in an embodiment of this application;

[0022] Figure 4 is a left view of the pin component provided in an embodiment of this application;

[0023] Figure 5 is a top view of the pin component provided in an embodiment of this application;

[0024] Figure 6 is a schematic diagram of the arc-shaped transition portion provided in an embodiment of this application;

[0025] Figure 7 is a schematic diagram of the battery structure provided in an embodiment of this application;

[0026] Figure 8 is a schematic diagram of the battery structure after the casing is removed, according to an embodiment of this application.

[0027] Figure 9 is a left view of the battery shown in Figure 8;

[0028] Figure 10 is a structural schematic diagram of the end cap assembly provided in an embodiment of this application;

[0029] Figure 11 is a top view of the end cap assembly shown in Figure 10;

[0030] Figure 12 is a cross-sectional view of Figure 11 along AA;

[0031] Figure 13 is an enlarged view of part A in Figure 12.

[0032] Explanation of reference numerals in the attached drawings: 100, battery; 10, end cap assembly; 11, end cap; 12, terminal post; 121, flange; 13, lead member; 131, electrode tab connection section; 1311, main body section; 13111, first straight section; 131111, first side surface; 13112, second straight section; 13113, connecting section; 1312, bending section; 1313, clearance groove; 133, first... 134. Second side surface; 135. Arc-shaped transition section; 132. Pole post connection section; 1321. First section; 1322. Second section; 13221. Pole post mounting hole; 132211. First hole section; 132212. Second hole section; 20. Housing; 30. Core package; 31. Main body; 32. Pole tab; 321. Straight area; 322. Bending area; X. Extension direction of pole post connection section. Embodiments of the present invention

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operation, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] In the description of the embodiments of this application, words such as "example" or "for example" are used to indicate exemplification, illustration, or description. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0039] In the description of the embodiments in this application, "perpendicular" is not strictly perpendicular, and a certain degree of error is allowed. Similarly, "parallel" is not strictly parallel, and a certain degree of error is allowed.

[0040] The lead assembly is one of the core components of a battery. It is used to make electrical connections between the terminals and the tabs of the cell pack. A crack in the lead assembly can lead to unstable or interrupted electrical connections, affecting the normal operation of the battery. At the same time, unstable electrical connections may cause uneven current distribution, resulting in local overheating. Long-term overheating will accelerate battery aging and may even lead to thermal runaway.

[0041] In related technologies, the positions of the terminals and tabs differ in space. Typically, the lead components are machined into complex shapes (e.g., L-shapes) and bent to ensure high spatial compatibility, facilitating the connection between terminals and tabs at different spatial locations to achieve electrical connection between the tabs and terminals. However, this structure results in corners on the sides of the lead components (i.e., the inner corners mentioned later), where stress concentration occurs, making the lead components prone to cracking.

[0042] Therefore, this application provides a pin component 13. The pin component 13 can be a positive pin component for electrically connecting the positive terminal and the positive tab, or it can be a negative pin component for electrically connecting the negative terminal and the negative tab. The material of the pin component 13 can be varied. For example, the material of the pin component 13 includes, but is not limited to, copper, nickel, steel, and their alloys. The specific structure of the pin component 13 will be described in detail below with reference to the accompanying drawings.

[0043] Referring to Figures 1 to 5, the pin component 13 includes a pole connection section 132 and a tab connection section 131. The pole connection section 132 is used to connect the pole 12 (mentioned later), and the tab connection section 131 is used to connect the tab 32 of the core package 30 (mentioned later), so that the pole 12 and the tab 32 are electrically connected through the pin component 13.

[0044] The pole connecting section 132 has a first section 1321 and a second section 1322 that are connected to each other. The first section 1321 and the second section 1322 can be arranged along the extension direction of the pole connecting section 131 (X direction in the figure). The second section 1322 is located on one side of the width direction of the pole connecting section 131.

[0045] The width of the first segment 1321 is smaller than the width of the second segment 1322. It should be noted that the extension direction of the pole connecting segment 132 can be understood as the length direction of the pole connecting segment 132, and the direction perpendicular to the extension direction of the pole connecting segment 132 can be understood as the width direction of the pole connecting segment 132 (Y direction in the figure). The dimension of the first segment 1321 along the width direction of the pole connecting segment 132 is the width of the first segment 1321. The dimension of the second segment 1322 along the width direction of the pole connecting segment 132 is the width of the second segment 1322.

[0046] The tab connecting section 131 is bent and connected to one side of the first section 1321 along its width direction. It should be understood that, through the bending connection, there is an angle between the tab connecting section 131 and the pole connecting section 132.

[0047] Along the extending direction of the electrode connection segment 132, the opposite sides of the tab connection segment 131 and the second segment 1322 smoothly transition. The opposite sides of the tab connection segment 131 and the second segment 1322 can be understood as the two side surfaces of the tab connection segment 131 and the second segment 1322 that are close to each other. As shown in Figure 1, at the inner corner D of the lead member 13, the second segment 1322 has a first side surface 133 close to the tab connection segment 131, and the tab connection segment 131 has a second side surface 134 close to the second segment 1322. The first side surface 133 and the second side surface 134 are the opposite sides of the tab connection segment 131 and the second segment 1322. It can be understood that the smooth transition between the opposite sides of the tab connection segment 131 and the second segment 1322 means that, through processing, the first side surface 133 and the second side surface 134 do not have abrupt changes at the connection point, achieving a smooth connection.

[0048] By making the terminal connection section 132 include a first section 1321 and a second section 1322, with the first section 1321 connecting the second section 1322 to the tab connection section 131, the first section being narrower than 1321 and requiring less material helps to meet the lightweight design of the lead member 13, while the second section 1322 being wider facilitates connection with the terminal 12. However, this will cause a sudden change in stress at the connection between the first section 1321 and the second section 1322, exacerbating the stress concentration at the inner corner D position on the lead member 13 side.

[0049] In the above embodiment, by making the tab connection section 131 and the second section 1322 smoothly transition on opposite sides, the stress distribution in the connection area on opposite sides of the tab connection section 131 and the second section 1322 is more uniform, thereby improving the stress concentration at the inner corner D position of the pin member 13, so that the pin member 13 is less likely to crack, thus reducing the risk of the pin member 13 cracking.

[0050] Referring to Figure 4, in some embodiments, the included angle α between the pole connecting section 132 and the tab connecting section 131 ranges from 87° to 92°. It should be understood that a smaller included angle between the pole connecting section 132 and the tab connecting section 131 represents a larger bending radius, while a larger included angle represents a smaller bending radius. Excessive bending radius leads to more severe material deformation at the bend, making the bend prone to cracking or breakage. Insufficient bending radius allows the lead member 13 to undergo plastic deformation under stress, reducing its load-bearing capacity and stiffness. Therefore, an included angle between the pole connecting section 132 and the tab connecting section 131 ranging from 87° to 92° minimizes the risk of cracking or breakage in the lead member 13, while also ensuring high load-bearing capacity and stiffness.

[0051] For example, the included angle between the pole connection section 132 and the tab connection section 131 can be 87°, 87.5°, 88°, 88.5°, 90°, 90.5°, 91°, 91.5°, 92° and any value between these.

[0052] Referring to Figures 1 and 2, and in conjunction with Figure 5, an arc-shaped transition portion 135 is defined on the opposite sides of the tab connecting section 131 and the second section 1322. The transition is smooth through the arc-shaped transition portion 135. Along the thickness direction of the pole connecting section 132 (Z direction in the figure), the orthographic projection of the arc-shaped transition portion 135 is an arc; in other words, the arc-shaped transition portion 135 is an arc surface. This configuration, compared to a curved transition portion, allows the arc-shaped transition portion 135 to evenly distribute stress in the connection area on the opposite sides of the tab connecting section 131 and the second section 1322, reducing the risk of the lead member 13 cracking.

[0053] In some embodiments, the orthographic projection of the arc-shaped transition portion 135 along the thickness direction of the electrode connection segment 132 is an arc line; in other words, the arc-shaped transition portion 135 is an arc surface. Compared to other forms of arc-shaped transition portions 135, the arc surface allows stress to be evenly distributed in the connection area on the opposite sides of the electrode connection segment 131 and the second segment 1322, greatly reducing the risk of the lead member 13 cracking.

[0054] Referring to Figure 6, in some embodiments, the radius of the arc is R, satisfying 1mm ≤ R ≤ 3mm. When the radius of the arc is greater than or equal to 1 mm, the arc-shaped transition portion 135 can disperse stress, making the lead member 13 less prone to cracking. When the radius of the arc is less than or equal to 13 mm, it is beneficial to reduce the size of the lead member 13. A smaller lead member 13 used in the battery 100 has a smaller volume and weight, which is beneficial to improving the energy density of the battery 100. Therefore, when the radius of the arc is between 1mm and 3mm, the lead member 13 is less prone to cracking and also helps to improve the energy density of the battery 100.

[0055] For example, the radius of the arc can be 1mm, 1.3mm, 1.4mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.9mm, 3mm, and any value between these values.

[0056] Referring to FIG2, in some embodiments, the tab connection segment 131 includes a main body segment 1311 and a bent segment 1312. The tab connection segment 131 is bent and connected to the first segment 1321 through the bent segment 1312. The main body segment 1311 is connected to the end of the bent segment 1312 away from the first segment 1321. The opposite sides of the bent segment 1312 and the second segment 1322 are smoothly transitioned.

[0057] Understandably, the second side surface 134 includes the side surface of the bent section 1312, and at the inner corner D, the side surface of the bent section 1312 smoothly transitions with the first side surface 131111 of the second section 1322. By making the opposite sides of the bent section 1312 and the second section 1322 smoothly transition, the processing difficulty of the transition between the first side surface 133 and the second side surface 134 can be reduced, and the fabrication difficulty of the lead member 13 can be reduced.

[0058] Referring to Figures 2 to 4, in some embodiments, the main body segment 1311 includes a first straight segment 13111, a second straight segment 13112, and a connecting segment 13113. The first straight segment 13111 and the second straight segment 13112 are arranged along the thickness direction (Z direction in the figure) of the pole connecting segment 132 and connected sequentially. Specifically, the first straight segment 13111 is connected to the end of the bent segment 1312 away from the first segment 1321, the connecting segment 13113 is connected to the end of the first straight segment 13111 away from the bent segment 1312, and the second straight segment 13112 is connected to the end of the connecting segment 13113 away from the first straight segment 13111.

[0059] The first segment 1321 is disposed opposite to the connecting segment 13113, and the first segment 1321, the bent segment 1312, the first straight segment 13111 and the connecting segment 13113 define the clearance groove 1313.

[0060] The clearance groove 1313 can avoid the tab 32 of the core package 30, reducing the pressure of the tab connecting section 131 on the tab 32.

[0061] Referring to Figure 9, when the core package 30 is a wound electrode assembly and the tab 32 has a bending area 322, the relief groove 1313 can especially avoid the bending area 322 of the tab 32, reducing the risk of the bending area 322 of the tab 32 cracking.

[0062] In some embodiments, the first straight segment 13111 and the bent segment 1312 smoothly transition near the side of the second segment 1322. It is understood that the second side surface 134 may also include the side of the first straight segment 13111.

[0063] In the above embodiment, the first straight section 13111 and the bent section 1312 smoothly transition on the side near the second section 1322, making the side stress of the bent section 1312 and the first straight section 13111 more uniform, reducing the risk of the pin component 13 cracking.

[0064] Referring to Figure 3, in some embodiments, the first straight section 13111 has a first side surface 131111 near the second section 1322. Along the thickness direction of the tab connecting section 131 (Y direction in the figure), the orthographic projection of the first side surface 131111 is a concave arc. This arrangement facilitates a smooth transition between the sides of the first straight section 13111 and the bent section 1312 near the second section 1322, reducing processing difficulty.

[0065] Referring again to Figure 3, in some embodiments, along the extending direction of the tab connecting section 131, the width of the first straight section 13111 gradually increases from the middle to both ends. Understandably, the ends of the first straight section 13111 connecting to the bent section 1312 and the first straight section 13111 connecting to the connecting section 13113 are both relatively large, while the middle portion of the first straight section 13111 is relatively narrow.

[0066] In the above embodiments, the end of the first straight section 13111 connected to the bent section 1312 is larger, and the first straight section 13111 and the bent section 1312 have a high connection strength. The end of the first straight section 13111 connected to the connecting section 13113 is larger, and the first straight section 13111 and the connecting section 13113 have a high connection strength.

[0067] As shown in Figure 3, it can be understood that the upper and lower parts of the first straight section 13111 are relatively large, while the middle part is relatively narrow.

[0068] In some embodiments, the second segment 1322 is provided with a pole mounting hole 13221. The pole mounting hole 13221 is for mounting the pole 12.

[0069] The shape of the pole mounting hole 13221 is adapted to the shape of the pole 12. The pole mounting hole 13221 can be constructed as a circle, square, ellipse, etc.

[0070] Optionally, the pole mounting hole 13221 is constructed as a round hole.

[0071] The electrode mounting hole 13221 can be configured as a blind hole or a through hole. Optionally, the electrode mounting hole 13221 can be configured as a through hole.

[0072] Among them, the pole mounting hole 13221 can be constructed as a stepped hole, a straight hole, etc.

[0073] Referring to Figures 2 and 5, and in conjunction with Figure 13, in some embodiments, the pole mounting hole 13221 is a stepped hole, which includes a first hole segment 132211 and a second hole segment 132212. The second hole segment 132212 is closer to the tab connection segment 131 than the first hole segment 132211. The cross-sectional area of ​​the first hole segment 132211 is larger than the cross-sectional area of ​​the second hole segment 132212, so that a step is formed between the first hole segment 132211 and the second hole segment 132212.

[0074] In the above embodiment, the electrode mounting hole 13221 is constructed as a stepped hole, which can increase the contact area between the hole wall of the electrode mounting hole 13221 and the electrode 12, thereby improving the connection stability between the electrode 12 and the lead member 13.

[0075] This application embodiment also provides a lead member 13, which includes a terminal connection section 132 and a tab connection section 131. The terminal connection section 132 includes a first section 1321 and a second section 1322, which are arranged along the extending direction of the terminal connection section 132. The width of the first section 1321 is smaller than that of the second section 1322. The second section 1322 is provided with a terminal mounting hole 13221. The terminal mounting hole 13221 is a stepped hole. The smaller end of the stepped hole is closer to the tab connection section 131. The tab connection section 131 includes a main body section 1311 and a bent section 1312, which is bent and connected to the terminal connection section 132 through the bent section 1312. The thickness direction of the main body section 1311 is perpendicular to the thickness direction of the terminal connection section 132. Near the inner corner D, the side of the second segment 1322 and the side of the first straight segment 13111 are connected by an arc. The opposite sides of the second segment 1322 and the first straight segment 13111 define an arc transition section with a radius between 1 mm and 3 mm.

[0076] Referring to Figures 7 to 13, and in conjunction with Figures 1 to 6, an embodiment of the present invention also provides a battery 100, which includes a housing 20, a core pack 30, and an end cap assembly 10.

[0077] The core package 30 is disposed within the housing 20. The core package 30 can be a wound electrode assembly, and it can be constructed in a flat shape. Specifically, the core package 30 may include a main body 3121 and two tabs 32 with opposite polarities. The tabs 32 can be full tabs, and along the extension direction of the winding axis of the core package 30, the two tabs 32 are respectively disposed on both sides of the main body 3121. The tabs 32 may include a straight area 321 and a bent area 322.

[0078] The end cap assembly 10 may include an end cap 11, a pin member 13 as described in the above embodiments, and two terminals 12 with opposite polarities. The end cap 11 covers the opening of the housing 20, and the end cap 11 and housing 20 define a receiving space for accommodating the core package 30. The terminals 12 can be mounted to the end cap 11 using riveting blocks. The pin member 13 is used to achieve electrical connection between the tabs 32 and terminals 12 of the same polarity. The pin member 13 that electrically connects the positive tab to the positive terminal can be understood as a positive pin member, and the pin member 13 that electrically connects the negative tab to the negative terminal can be understood as a negative pin member.

[0079] In some embodiments, the thickness direction of the pole connecting section 132 is parallel to the thickness direction of the end cap 11 (Z direction in the figure), the thickness direction of the tab connecting section 131 is parallel to the thickness direction of the core package 30, the second straight section 13112 is welded to the straight area 321 of the tab 32, and the opening of the relief groove 1313 faces the bending area 322 of the tab 32 to avoid the bending area 322 and reduce the compression of the bending area 322 by the tab connecting section 131. The pole 12 is partially disposed in the pole mounting hole 13221.

[0080] Referring to Figure 13, in some embodiments, the outer peripheral surface of the pole post 12 is provided with a flange 121, which extends along the axial direction of the pole post 12. The pole post mounting hole 13221 is a stepped hole, and the pole post 12 abuts against the step of the pole post mounting hole 13221 through the flange 121. The pole post 12 is partially disposed in the first hole section 132211 and partially disposed in the second hole section 132212.

[0081] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A pin component, comprising: The pole connecting section has a first section and a second section that are connected to each other, wherein the width of the first section is smaller than the width of the second section; The tab connecting section is bent and connected to one side of the first section along its width direction, and is spaced apart from the second section. Along the extension direction of the pole connecting section, the opposite sides of the tab connecting section and the second section are smoothly transitioned.

2. The lead member of claim 1, wherein, The opposite sides of the electrode connecting section and the second section define an arc-shaped transition section, and the transition is smooth through the arc-shaped transition section. The orthographic projection of the arc-shaped transition section along the thickness direction of the electrode connecting section is an arc.

3. The pin component according to claim 2, wherein, Along the thickness direction of the pole connecting section, the orthographic projection of the arc-shaped transition section is a circular arc.

4. The pin member according to claim 3, wherein, The radius of the arc is R, which satisfies 1mm≤R≤3mm.

5. The pin member according to any one of claims 1-4, wherein, The electrode connecting section includes a main body section and a bent section. The electrode connecting section is bent and connected to the first section through the bent section. The main body section is connected to the end of the bent section away from the first section. The bent section and the second section have a smooth transition on opposite sides.

6. The pin member according to claim 5, wherein, The main body segment includes a first straight segment, a second straight segment, and a connecting segment. The first straight segment is connected to the end of the bent segment away from the first segment. The connecting segment is connected to the end of the first straight segment away from the bent segment. The second straight segment is connected to the end of the connecting segment away from the first straight segment. The first segment is disposed opposite to the connecting segment, and the first segment, the bent segment, the first straight segment and the connecting segment define an avoidance groove.

7. The pin member according to claim 6, wherein, The first straight section and the bent section have a smooth transition on the side near the second section.

8. The pin member according to claim 7, wherein, The first straight section has a first side surface near the second section, and the orthographic projection of the first side surface along the thickness direction of the tab connecting section is a concave arc.

9. The pin member according to claim 8, wherein, Along the extension direction of the tab connection section, from the middle to both ends of the first straight section, the width of the first straight section gradually increases.

10. The pin member according to any one of claims 1-9, wherein, The second section is provided with pole mounting holes.

11. The pin member according to claim 10, wherein, The pole mounting hole includes a first hole segment and a second hole segment. The second hole segment is closer to the tab connection segment than the first hole segment. The cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, so that a step is formed between the first hole segment and the second hole segment.

12. A battery comprising the lead member as described in any one of claims 1-11.

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