Battery pin, secondary battery, and battery mounting apparatus

Abstract

A battery pin, a secondary battery, and a battery mounting apparatus. A first connecting section (20) in the battery pin is disposed on a top cover and is connected to a pole; a second connecting section (30) is connected to the first connecting section (20) and is provided with a first slot (310) and a connecting part (320); a first tab part (120) is penetratingly disposed in the first slot (310), and the connecting part (320) is connected to a second tab part (130). A preset included angle is formed between the first connecting section (20) and the second connecting section (30), and when the first slot (310) passes through the first tab part (120), the connecting part (320) is located between a side surface of a cell package (10) and the second tab part (130).

Description

Battery pin, secondary battery, and battery mounting device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 27, 2023, with application number 2023235912553. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery pin, a secondary battery, and a battery mounting device. Background Art

[0003] With the development of battery technology, batteries are being used in an increasingly wide range of applications. Batteries can be categorized by shape into cylindrical and prismatic batteries. Currently, in prismatic batteries, pins are typically used to connect the battery's top cover and tabs, with the pins and tabs connected via ultrasonic welding. To achieve the desired welding effect, the tabs must first be pre-welded and trimmed, and then the trimmed tabs and pins must be final welded. After welding, the pins must be bent toward the core package. The connection between the pins and tabs requires four steps: pre-welding, tab trimming, final welding, and bending the pins. Technical issues

[0004] After welding is completed, the pins need to be bent toward the core package, which can easily cause the tabs to be inserted upside down. The pins are heavy and the assembly gap between the pins and the tabs is large. The connection between the pins and the tabs requires four processes: pre-welding, cutting the tabs, final welding, and bending the pins. There are many processes, and each process requires corresponding tooling and fixtures, which is costly. Technical Solutions

[0005] In a first aspect, the present application provides a battery pin for use in a secondary battery. The secondary battery includes a core pack and a top cover disposed on the core pack, wherein the top cover is provided with a pole, and a tab is provided on one side of the core pack. The tab includes a first tab portion connected to the core pack and a second tab portion connected to the first tab portion. The battery pin includes:

[0006] A first connecting section, the first connecting section is arranged on the top cover, and the first connecting section is connected to the pole;

[0007] The second connecting section is connected to the first connecting section, the second connecting section is provided with a first slot and a connecting portion, the first pole ear portion is passed through the first slot, the connecting portion is located between one side surface of the core package and the second pole ear portion, and the connecting portion is connected to the second pole ear portion; a preset angle is formed between the first connecting section and the second connecting section.

[0008] In a second aspect, the present application provides a secondary battery, comprising a core pack, a top cover provided on the core pack, and a battery pin provided in the present application;

[0009] The top cover is provided with a pole, and a pole ear is provided on one side of the core package, and the pole ear includes a first pole ear portion connected to the core package and a second pole ear portion connected to the first pole ear portion;

[0010] The battery pins are connected to the pole and the second pole ear respectively.

[0011] In a third aspect, the present application provides a battery mounting device, including a mounting fixture, which is applied to the secondary battery provided in the present application; the mounting fixture includes a first support plate and a second support plate, the first support plate being connected to the second support plate;

[0012] The first support plate is used to reshape the second pole lug portion, and the first support plate is also used to support the connecting portion so as to connect the reshaped second pole lug portion to the connecting portion;

[0013] The second support plate is used to limit the side of the connecting part. Beneficial effects

[0014] The beneficial effects of the battery pin, secondary battery and battery installation device provided by the present application are: by optimizing the design of the battery pin, by providing a first slot for penetrating the first pole ear portion in the second connecting section, the second connecting section can be embedded in the first pole ear portion, and the connecting portion of the second connecting section can establish an electrical connection with the second pole ear portion, thereby reducing the assembly gap between the pin and the pole ear, and because when the first pole ear portion is penetrated by the first slot, the connecting portion is located between the side surface of the core package and the second pole ear portion, thereby preventing the pole ear from being inserted upside down; at the same time, by providing the first slot, the weight of the pin is reduced, the cost is reduced, and by providing a preset angle between the first connecting section and the second connecting section, when the second connecting section is assembled on the pole ear, the first connecting section can be quickly assembled on the pole column, so that the pole ear and the pole column are electrically connected, simplifying the assembly process of the pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic structural diagram of a battery pin provided by the present application from one perspective;

[0016] FIG2 is a schematic structural diagram of the battery pins provided in this application from another perspective;

[0017] FIG3 is a schematic diagram of the assembly structure of the battery pins provided in this application;

[0018] FIG4 is a schematic diagram of the exploded structure of the battery installation device provided in this application;

[0019] FIG5 is a schematic diagram of the application structure of the battery installation device provided in this application.

[0020] Reference numerals:

[0021] 10. Core package; 110. Tab; 120. First tab portion; 130. Second tab portion; 132. First tab subsection; 134. Second tab subsection; 20. First connecting section; 210. Mounting hole; 30. Second connecting section; 310. First slot; 320. Connecting portion; 322. First connecting area; 324. Second connecting area; 40. Transition section; 50. First support plate; 60. Second support plate. Modes for Carrying Out the Invention

[0022] In one embodiment, as shown in Figures 1 to 4, a battery pin is provided, which is applied to a secondary battery. The secondary battery includes a core pack 10 and a top cover arranged on the core pack 10, the top cover is provided with a pole, and a pole ear 110 is provided on one side of the core pack 10. The pole ear 110 includes a first pole ear portion 120 connected to the core pack 10 and a second pole ear portion 130 connected to the first pole ear portion 120; the battery pin includes a first connecting segment 20 and a second connecting segment 30; the first connecting segment 20 is provided on the top cover, and the first connecting segment 20 is connected to the pole; the second connecting segment 30 is connected to the first connecting segment 20, and the second connecting segment 30 is provided with a first slot 310 and a connecting portion 320, the first pole ear portion 120 is passed through the first slot 310, the connecting portion 320 is located between one side of the core pack 10 and the second pole ear portion 130, and the connecting portion 320 is connected to the second pole ear portion 130; a preset angle is formed between the first connecting segment 20 and the second connecting segment 30.

[0023] The secondary battery can be, but is not limited to, a lithium battery. For example, the secondary battery can be a prismatic lithium battery. The secondary battery can include a core pack 10 and a top cover. The core pack 10 is generally prismatic in structure. The top cover is disposed on the top surface of the core pack 10. For example, the top cover can be mounted on the top surface of the core pack 10 by snapping. The top cover is provided with poles; illustratively, a positive pole is disposed adjacent to a first end of the top cover, and a negative pole is disposed adjacent to a second end of the top cover.

[0024] A tab 110 is provided on one side of the core package 10. For example, if the core package 10 is in the shape of a rectangular parallelepiped, the core package 10 includes two wide sides and two narrow sides, and the area of ​​the wide sides is greater than the area of ​​the narrow sides. Thus, the tab 110 is provided on the narrow side of the core package 10. For example, the tab 110 includes a positive tab 110 and a negative tab 110. The positive tab 110 is provided on the first narrow side of the core package 10, and the negative tab 110 is provided on the second narrow side of the core package 10. Furthermore, a battery pin may be provided between the positive tab 110 and the positive electrode post to establish an electrical connection between the positive tab 110 and the positive electrode post, and another battery pin may be provided between the negative tab 110 and the negative electrode post to establish an electrical connection between the negative tab 110 and the negative electrode post.

[0025] The tab 110 includes a first tab portion 120 and a second tab portion 130. The first tab portion 120 is disposed between a side surface of the core package 10 and the second tab portion 130. The first tab portion 120 extends from a side surface of the core package 10 to support the second tab portion 130. The second tab portion 130 is used to electrically connect to the battery tab 110.

[0026] The battery pin can be divided into a first connecting segment 20 and a second connecting segment 30 connecting the first connecting segment 20. A preset angle is formed between the first connecting segment 20 and the second connecting segment 30. The value of the preset angle can be determined based on the angle between the top cover and the side of the core package 10, as well as the length of the first connecting portion 320 extending from the side of the core package 10. For example, the preset angle can be set between 85° and 95°. By setting the preset angle between the first connecting segment 20 and the second connecting segment 30, the second connecting segment 30 can be assembled with the second terminal lug 130, and the first connecting segment 20 can be assembled with the first terminal lug 120. It should be noted that the first connecting segment 20 and the second connecting segment 30 are integrally formed. For example, the first connecting segment 20 and the second connecting segment 30 can be formed by a single bending process based on the preset angle.

[0027] The first connecting section 20 can be attached to the top cover and is used to electrically connect to the pole. For example, the first connecting section 20 can be sleeved onto the pole and locked to the top cover, thereby securing the first connecting section 20 to the pole and establishing an electrical connection between the first connecting section 20 and the pole.

[0028] The second connecting segment 30 is provided with a first slot 310 for receiving the first tab 120. For example, the first slot 310 can be a slit-like opening. The provision of the first slot 310 in the second connecting segment 30 can reduce the overall weight of the battery tab 110 and improve the battery's mass energy density. The second connecting segment 30 is also provided with connecting portions 320. For example, the connecting portions 320 can be located on either side of the first slot 310. During assembly, the second connecting segment 30 is inserted into the first tab 120, with the first tab 120 passing through the first slot 310. This allows the connecting portions 320 to be positioned between the second tab 130 and the corresponding side surface of the core pack 10, thereby connecting the second tab 130 to the connecting portions 320. For example, the second tab 130 can be fixedly mounted to the connecting portion 320 of the second connecting segment 30 by welding, thereby achieving electrical connection between the second tab 130 and the connecting portions 320.

[0029] In the embodiment provided in the present application, a first connecting section 20 is provided on the top cover, and the first connecting section 20 is connected to the pole; the second connecting section 30 is connected to the first connecting section 20, and the second connecting section 30 is provided with a first slot 310 and a connecting portion 320, the first pole ear portion 120 is passed through the first slot 310, and the connecting portion 320 is located between one side of the core package 10 and the second pole ear portion 130, and the connecting portion 320 is connected to the second pole ear portion 130; a preset angle is formed between the first connecting section 20 and the second connecting section 30, so as to realize convenient and reliable assembly of the battery pins. The present application optimizes the design of the battery pin and provides a first slot 310 for penetrating the first pole ear portion 120 in the second connecting section 30, so that the second connecting section 30 can be embedded in the first pole ear portion 120, and the connecting portion 320 of the second connecting section 30 can establish an electrical connection with the second pole ear portion 130, thereby reducing the assembly gap between the pin and the pole ear 110. Moreover, since the first pole ear portion 120 is penetrated by the first slot 310, the connecting portion 320 is located between the side surface of the core package 10 and the second pole ear portion 130, thereby preventing the pole ear 110 from being inserted upside down. At the same time, by providing the first slot 310, the weight of the pin is reduced and the cost is reduced. By providing a preset angle between the first connecting section 20 and the second connecting section 30, when the second connecting section 30 is assembled on the pole ear 110, the first connecting section 20 can be quickly assembled on the pole column, so that the pole ear 110 is electrically connected to the pole column, thereby simplifying the assembly process of the pin.

[0030] In one embodiment, as shown in Figures 2 and 3, the connecting portion 320 is provided with a first connecting area 322 and a second connecting area 324; the second pole ear portion 130 includes a first pole ear division 132 and a second pole ear division 134; the first slot 310 is located between the first connecting area 322 and the second connecting area 324, the first connecting area 322 is connected to the first pole ear division 132, and the second connecting area 324 is connected to the second pole ear division 134.

[0031] The connecting portion 320 can be divided into a first connecting area 322 and a second connecting area 324. The first connecting area 322 and the second connecting area 324 have the same shape and size. The first connecting area 322 is located on one side of the first slot 310, and the second connecting area 324 is located on the other side of the first slot 310. For example, a slit opening can be provided in the second connecting section 30, thereby forming the first slot 310. The first connecting area 322 is formed on the first side of the slit opening, and the second connecting area 324 is formed on the second side of the slit opening.

[0032] The second pole tab portion 130 can be divided into a second pole tab portion 134 of the first pole tab portion 132. The first pole tab portion 132 is connected to the first connection area 322 and is used to connect to the first connection area 322; the second pole tab portion 134 is connected to the second connection area 324 and is used to connect to the second connection area 324. For example, the first tab portion 132 can be flattened and attached to the first connection area 322 by ultrasonic flattening, and the second tab portion 134 can be flattened and attached to the connection area; then, the first tab portion 132 can be welded to the first connection area 322, and the second tab portion 134 can be welded to the second connection area 324 by welding, so as to establish an electrical connection between the first connection area 322 and the first tab portion 132, and between the second connection area 324 and the second tab portion 134, thereby eliminating the need for pre-welding and cutting of the battery tab 110, reducing the number of steps, simplifying the pin assembly process, and reducing costs.

[0033] In one example, the area of ​​the first connection region 322 is greater than or equal to the area of ​​the first tab portion 132 ; and the area of ​​the second connection region 324 is greater than or equal to the area of ​​the second tab portion 134 .

[0034] By setting the area of ​​the first connection region 322 to be greater than or equal to the area of ​​the first tab sub-portion 132, the first connection region 322 can completely cover the first tab sub-portion 132, and the first tab sub-portion 132 can be completely disposed on the first connection region 322, thereby preventing the first tab sub-portion 132 from being exposed from the first connection region 322 and contacting the core package 10, thereby preventing the first tab sub-portion 132 from being inserted upside down. By setting the area of ​​the second connection region 324 to be greater than or equal to the area of ​​the second tab sub-portion 134, thereby allowing the second connection region 324 to completely cover the second tab sub-portion 134, the second tab sub-portion 134 can be completely disposed on the second connection region 324, thereby preventing the second tab sub-portion 134 from being exposed from the second connection region 324 and contacting the core package 10, thereby preventing the second tab sub-portion 134 from being inserted upside down.

[0035] In one example, the first tab portion 132 is attached to the first connection region 322 , and the second tab portion 134 is attached to the second connection region 324 .

[0036] For example, the first tab section 132 can be flattened and attached to the first connection area 322 by ultrasonic flattening, so that the first connection area 322 can completely cover the first tab section 132, and then the first tab section 132 can be mounted and fixed to the first connection area 322 by welding, thereby achieving electrical connection between the first connection area 322 and the first tab section 132. In addition, the second tab section 134 can be flattened and attached to the second connection area 324 by ultrasonic flattening, so that the second connection area 324 can completely cover the second tab section 134, and then the second tab section 134 can be mounted and fixed to the second connection area 324 by welding, thereby achieving electrical connection between the second connection area 324 and the second tab section 134.

[0037] During the assembly process of the battery pin, the second connecting section 30 is embedded in the first pole ear portion 120, and the first pole ear portion 120 is penetrated through the first slot 310 of the second connecting section 30, and the first pole ear portion 132 is attached to the first connection area 322, and the second pole ear portion 134 is attached to the second connection area 324, so as to realize the electrical connection between the first pole ear portion 132 and the first connection area 322, and the electrical connection between the second pole ear portion 134 and the second connection area 324, thereby reducing the assembly gap between the pin and the pole ear 110, and because the first pole ear portion 132 can be attached to the first connection area 322, and the second pole ear portion 134 can be attached to the second connection area 324, the pole ear 110 can be prevented from being inserted upside down; at the same time, by setting the first slot 310 between the first connection area 322 and the second connection area 324, the pin weight is reduced, the cost is reduced, and when assembling the battery pin, there is no need to match the A-type or B-type core package 10, thereby simplifying the assembly process.

[0038] In one embodiment, as shown in FIG3 , the first connecting section 20 is provided with a mounting hole 210 , and the mounting hole 210 is sleeved on the pole.

[0039] The mounting hole 210 may be, but is not limited to, a circular or elliptical hole. It should be noted that the shape and size of the mounting hole 210 may be determined based on the shape and size of the pole. For example, if the pole is cylindrical, the mounting hole 210 may be circular, and the size of the mounting hole 210 may be larger than the size of the pole, thereby enabling the mounting hole 210 of the first connecting section 20 to be sleeved onto the pole.

[0040] During battery pin assembly, the first slot 310 of the second connecting segment 30 is aligned with the first tab 120, and the mounting hole 210 of the first connecting segment 20 is aligned with the terminal. The mounting hole 210 of the first connecting segment 20 is then sleeved onto the terminal, allowing the second connecting segment 30 to be embedded in the first tab 120. The first slot 310 of the second connecting segment 30 penetrates the first tab 120. Fasteners can be used to fasten the first connecting segment 20 to the terminal, achieving a mounting connection between the first connecting segment 20 and the terminal. The second tab 130 can be welded to the connecting portion 320 of the second connecting segment 30, achieving a mounting connection between the connecting portion 320 and the second tab 130. This simplifies the pin assembly process, reduces the assembly gap between the pin and the tab 110, improves the volume utilization of the core pack 10, and prevents the tab 110 from being inserted upside down. The provision of the first slot 310 reduces pin weight, reduces costs, and increases the available assembly space within the battery, thereby increasing battery capacity.

[0041] In one embodiment, as shown in FIG. 3 , the width of the first slot 310 is greater than the thickness of the first pole lug portion 120 , and the depth of the first slot 310 is greater than or equal to the height of the first pole lug portion 120 .

[0042] The width of the first slot 310 refers to the width of the slit opening provided in the second connecting section 30, and the depth of the first slot 310 refers to the depth of the slit opening provided in the second connecting section 30. The first pole ear portion 120 may have a sheet-like structure, the thickness of the first pole ear portion 120 is the sheet-like thickness, and the height of the first pole ear portion 120 refers to the distance from the bottom end to the top end of the first pole ear portion 120.

[0043] By setting the width of the first slot 310 to be greater than the thickness of the first tab 120, when the second connecting segment 30 is inserted into the first tab 120, the first tab 120 can be inserted into the first slot 310, while also reducing the weight of the battery pins. By setting the depth of the first slot 310 to be greater than or equal to the height of the first tab 120, after the second connecting segment 30 is inserted into the first tab 120, the connecting portion 320 in the second connecting segment 30 can completely cover the second tab 130, thereby electrically connecting the second tab 130 and the connecting portion 320, while also preventing the second tab 130 from being inserted upside down.

[0044] In one embodiment, the battery pin further includes a transition section 40 ; the transition section 40 is disposed between the first connecting section and the second connecting section.

[0045] The transition section 40 is an arc transition section 40, which is arranged between the first connecting section and the second connecting section, thereby making an arc transition between the first connecting section and the second connecting section, thereby improving the connection strength between the first connecting section and the second connecting section, thereby enhancing the strength of the battery pin.

[0046] In one embodiment, the first connecting section 20 is perpendicular to the second connecting section 30 .

[0047] Taking into account that the side surface of the core package 10 is perpendicular to the top surface of the core package 10, the angle between the first connecting segment 20 and the second connecting segment 30 is set to 90°. When the second connecting segment 30 is assembled on the pole ear 110, the first connecting segment 20 can be quickly assembled on the pole, so that the pole ear 110 establishes an electrical connection with the pole, simplifying the assembly process of the pin.

[0048] For example, a flat plate structure can be used, and multiple initial pins can be arranged in parallel on the flat plate structure. Then, by cutting the flat plate structure, multiple initial pins can be obtained at one time, and then the multiple initial pins are bent once to obtain multiple battery pins, thereby improving material utilization and production efficiency.

[0049] In one embodiment, as shown in FIG3 , a secondary battery is further provided, comprising a core pack 10, a top cover arranged on the core pack 10, and a battery pin provided in an embodiment of the present application; the top cover is provided with a pole, and a pole ear 110 is provided on one side of the core pack 10, the pole ear 110 comprising a first pole ear portion 120 connected to the core pack 10 and a second pole ear portion 130 connected to the first pole ear portion 120; the battery pins are respectively connected to the pole column and the second pole ear portion 130.

[0050] Among them, the description of the core pack 10, the top cover and the battery pins can refer to the description of the core pack 10, the top cover and the battery pins in the embodiments provided in this application, and will not be repeated here.

[0051] The first connecting section 20 is arranged on the top cover, and the first connecting section 20 is connected to the pole; the second connecting section 30 is connected to the first connecting section 20, and the second connecting section 30 is provided with a first slot 310 and a connecting portion 320, the first pole ear portion 120 is passed through the first slot 310, and the connecting portion 320 is connected to the second pole ear portion 130; a preset angle is formed between the first connecting section 20 and the second connecting section 30, so as to realize convenient and reliable assembly of the battery pins. The present application optimizes the design of the battery pin and provides a first slot 310 for penetrating the first pole ear portion 120 in the second connecting section 30, so that the second connecting section 30 can be embedded in the first pole ear portion 120, and the connecting portion 320 of the second connecting section 30 can establish an electrical connection with the second pole ear portion 130, thereby reducing the assembly gap between the pin and the pole ear 110. Moreover, since the first pole ear portion 120 is penetrated by the first slot 310, the connecting portion 320 is located between the side surface of the core package 10 and the second pole ear portion 130, thereby preventing the pole ear 110 from being inserted upside down. At the same time, by providing the first slot 310, the weight of the pin is reduced and the cost is reduced. By providing a preset angle between the first connecting section 20 and the second connecting section 30, when the second connecting section 30 is assembled on the pole ear 110, the first connecting section 20 can be quickly assembled on the pole column, so that the pole ear 110 is electrically connected to the pole column, thereby simplifying the assembly process of the pin.

[0052] It should be noted that the secondary battery may further include components such as a housing, and the secondary battery may include more components than those described in the embodiments provided in this application, or may combine multiple components, or have a different component arrangement.

[0053] In one embodiment, as shown in Figures 4 and 5, a battery mounting device is also provided, including a mounting fixture, which is applied to the secondary battery provided in the embodiment of the present application; the mounting fixture includes a first support plate 50 and a second support plate 60, and the first support plate 50 is connected to the second support plate 60; the first support plate 50 is used to shape the second pole ear portion 130, and the first support plate 50 is also used to support the connecting portion 320 to connect the shaped second pole ear portion 130 to the connecting portion 320; the second support plate 60 is used to limit the side of the connecting portion 320.

[0054] The mounting fixture shapes the tab 110 and supports and holds the battery pin, facilitating the flattening and welding of the second tab portion 130 of the tab 110 to the connecting portion 320 of the battery pin. The first support plate 50 and the second support plate 60 are an integrally formed structure. For example, the first support plate 50 is perpendicular to the second support plate 60, so that the mounting fixture is an L-shaped structure as a whole. The first support plate 50 can be used to shape the second tab portion 130. The first support plate 50 can also be used to support the connecting portion 320 of the second connecting section 30 so that the second tab portion 130 can be welded to the connecting portion 320. The second support plate 60 can be used to limit the side of the connecting portion 320 to achieve alignment and welding of the connecting portion 320 and the second tab portion 130.

[0055] For example, there are two first support plates 50 and two second support plates 60. One first support plate 50 and one second support plate 60 form a first L-shaped structure, and another first support plate 50 and another second support plate 60 form a second L-shaped structure. The first L-shaped structure is used to support the first connection area 322 and to shape and laterally limit the first tab section 132; the second L-shaped structure is used to support the second connection area 324 and to shape and laterally limit the second tab section 134.

[0056] By placing the core package 10 into the installation fixture, the installation fixture regularizes the tab 110, forming the tab 110 into a first tab portion 120 and a second tab portion 130. The second connecting segment 30 is then embedded in the first tab portion 120, so that the first tab portion 120 passes through the first slot 310 of the second connecting segment 30, and the second connecting segment 30 is located between the first support plate 50 and the second tab portion 130. Based on the holding function of the installation fixture, the second tab portion 130 can be flattened and welded to the connecting portion 320 of the second connecting segment 30 using ultrasonic flattening, thereby eliminating the need for pre-welding and cutting of the tab 110, simplifying the assembly process and reducing costs.

Claims

1. A battery pin is applied to a secondary battery. The secondary battery includes a core package and a top cover disposed on the core package. The top cover is provided with a pole column, and a pole ear is disposed on one side surface of the core package. The pole ear includes a first pole ear portion connecting the core package and a second pole ear portion connecting the first pole ear portion; The battery pin includes: A first connection section, which is arranged on the top cover, and the first connection section is connected to the pole column; A second connection section, which connects the first connection section. The second connection section is provided with a first slot and a connection part. The first pole ear part penetrates through the first slot. The connection part is located between one side surface of the core package and the second pole ear part, and the connection part is connected to the second pole ear part. A preset angle is formed between the first connection section and the second connection section.

2. The battery pin according to claim 1, wherein The connection part is provided with a first connection area and a second connection area; the second pole ear part includes a first pole ear sub - part and a second pole ear sub - part; The first slot is located between the first connection area and the second connection area. The first connection area is connected to the first pole ear sub - part, and the second connection area is connected to the second pole ear sub - part.

3. The battery pin according to claim 2, wherein, The area of the first connection area is greater than or equal to the area of the first pole ear sub - part; The area of the second connection area is greater than or equal to the area of the second pole ear sub - part.

4. The battery pin according to claim 3, wherein, The first pole ear sub - part is attached to the first connection area; the second pole ear sub - part is attached to the second connection area.

5. The battery pin according to claim 1, wherein, The first connection section is provided with a mounting hole, and the mounting hole is sleeved on the pole column.

6. The battery pin according to any one of claims 1 to 5, wherein The width of the first slot is greater than the thickness of the first pole ear part, and the depth of the first slot is greater than or equal to the height of the first pole ear part.

7. The battery pin according to claim 6 further includes a transition section; the transition section is arranged between the first connection section and the second connection section.

8. A secondary battery includes a core package, a top cover arranged on the core package, and the battery pin according to any one of claims 1 to 7; The top cover is provided with a pole column, and one side surface of the core package is provided with pole ears. The pole ears include a first pole ear part connecting the core package and a second pole ear part connecting the first pole ear part; The battery pin is respectively connected to the pole column and the second pole ear part.

9. A battery installation device includes a mounting fixture, and the mounting fixture is applied to the secondary battery according to claim 8; the mounting fixture includes a first support plate and a second support plate, and the first support plate is connected to the second support plate; The first support plate is used for shaping the second pole ear part, and the first support plate is also used for supporting the connection part so that the shaped second pole ear part is connected to the connection part; The second support plate is used for performing side - limit on the connection part.

10. The battery mounting device according to claim 9, wherein, The first support plate is perpendicular to the second support plate.

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