Pin with indentation structure

Abstract

The utility model discloses a pin with an indentation structure, a pin body is used for enabling a top cover and a battery cell to be electrically connected with each other, the pin body is bent to form a welding part electrically connected with a tab of the battery cell, so that a bent transition part is formed between the pin body and the welding part, the bent transition part is of a thin-wall structure, and the thickness of the bent transition part is larger than that of the welding part. A plurality of thickening ribs distributed at intervals in the length direction of the bending transition part are formed on the inner wall of the bending transition part; the pin body is further bent to form a switching part which is electrically connected with the electrode column of the top cover. According to the utility model, fusing is facilitated to form over-current protection, and the connection stability is ensured at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a pin with an indentation structure. Background Art

[0002] A battery is a device that converts chemical energy into electrical energy. It usually includes a battery cell, a pole column, and a pin body. The pin body is fixed between the battery cell and the pole column, that is, the battery cell and the pole column are electrically connected through the pin body, so that the battery can supply power outward through the pole column. The pin body is usually an L-shaped connecting piece structure, which includes two connecting plates arranged perpendicular to each other. One connecting plate is parallel to the top cover and connected to the pole column, and the other connecting plate is located on the side of the battery cell as a tab and connected to the battery cell. This connecting plate usually needs to be bent and then connected to the battery cell, that is, the connecting plate forms a bent plate, and the bent plate is used to connect the battery cell. However, there is a problem that since the connecting plate is a plate structure, it is very easy to deform and bulge, resulting in poor contact with the battery cell, and ultimately leading to unsmooth current conduction. Content of the Utility Model

[0003] The purpose of the utility model is to design a pin with an indentation structure to solve the above-mentioned technical deficiencies.

[0004] The utility model designs a pin with an indentation structure, which includes a pin body. The pin body is used to electrically connect the top cover and the battery cell. A welding part electrically connected to the tab of the battery cell is formed by bending on the pin body, so as to form a bending transition part between the pin body and the welding part. A groove is opened along the bending line on the inner wall of the bending transition part, so that the bending transition part forms a thin-walled structure along the bending line. A plurality of thickening ribs are formed in the groove at intervals along its length direction; a transition part electrically connected to the electrode column of the top cover is also formed by bending on the pin body.

[0005] Preferably, the pin body is a conductive sheet, and the conductive sheet is bent twice to form a transition part, a bending transition part and a welding part.

[0006] Further optimization: the thickening ribs located in the groove face the pin body and the welding part respectively before and after.

[0007] Further optimization: the bending angle between the welding part and the pin body is 90 degrees.

[0008] Further optimization: both the welding part and the pin body are plate structures and have the same thickness.

[0009] Further optimization: the number of the pin bodies is two, which are respectively located on both sides of the top cover, and the corresponding transition parts are also two. A fuse hole is provided at a position where one transition part is close to the bending transition part.

[0010] Further optimization is that the fusing hole is a through hole or a blind hole.

[0011] Further optimization is that the shape of the fusing hole is rectangular.

[0012] Further optimization is that the number of the fusing holes is multiple, and they are arranged at intervals vertically and horizontally on the same straight line.

[0013] The technical effect of the present utility model is that the pin body forms a transition part and a welding part through bending. The welding part is used to connect the tab on the battery cell. The welding part is a plate structure for connecting the tab and the battery cell. The transition part is connected to the top cover through the electrode post. A bending transition part is formed between the welding part and the pin body. A groove is provided along the bending line on the inner wall of the bending part of the bending transition part, so that a thin-wall structure is formed at the bending part. The thin wall is conducive to fusing to form overcurrent protection. Multiple thickening ribs are arranged at intervals in the groove for reinforcement. On the premise of being able to fuse, it not only strengthens the connection strength of the welding part, but also prevents the welding part from bulging during connection. At the same time, it also increases the current conduction area with the battery cell tab. A fusing hole is provided on one of the transition parts. The shape of the fusing hole is rectangular, and multiple fusing holes are arranged at intervals vertically and horizontally on the same straight line. It can not only effectively perform secondary fusing, but also ensure the overall strength of the transition part, so that the transition part will not be easily bent or broken. Description of the Drawings

[0014] Figure 1 is the overall structure diagram of the present utility model;

[0015] Figure 2 is the exploded view of the overall structure of the present utility model;

[0016] Figure 3 is the structure diagram of the groove and the reinforcing rib in the present utility model.

[0017] In the figure: 1, top cover; 2, pin body; 21, transition part; 22, bending transition part; 23, welding part; 24, groove; 25, thickening rib; 26, fusing hole; 3, electrode post. Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model.

[0019] Such as Figure 1 and 2As shown, the number of pin bodies 2 of the present utility model is two, which are respectively located on both sides of the top cover 1. Each pin body 2 forms a transition part 21 and a welding part 23 after being bent. The bending angles between the transition part 21 and the pin body 2, and between the welding part 23 and the pin body 2 are both 90 degrees. Both the transition part 21 and the welding part 23 are connecting plate structures, that is, plate-like structures. The transition part 21 is attached to the bottom of the top cover 1 and fixed by the electrode post 3.

[0020] As Figure 3 As shown, a bending transition part 22 is formed between the welding part 23 and the pin body 2. A groove 24 is provided along the bending line at the center of the inner wall of the bending transition part 22, so that the bending transition part 22 is a thin-walled structure, thereby connecting the welding part 23 and the pin body 2. That is, the welding part 23 and the pin body 2 are connected by the bent thin-walled structure. The groove 24 is arranged along the length direction of the central position of the thin-walled structure. The thickness of the bending transition part 22 gradually decreases from the middle to both sides where the welding part 23 is located. A plurality of thickening ribs 25 are distributed at intervals along the bending line in the groove 24. The thickening ribs 25 and the thin-walled structure are integrally designed. It can be understood that the thickening ribs 25 extend from the bottom of the groove 24. The thickening ribs 25 are respectively connected to the two side surfaces of the groove 24 before and after, that is, the thickening ribs 25 face the welding part 23 and the pin body 2 before and after respectively, so that the thin-walled structure forms local thickening, which not only does not affect the fusing caused by overload protection, but also strengthens the bending strength of the welding part 23, making the welding part 23 not easily deformed.

[0021] The bottom surface of the groove 24 is an arc transition surface, so as to avoid forming a right-angle edge at the connection between the pin body 2 and the welding part 23, so as to damage the pin body 2.

[0022] The pin body 2 is also a plate structure, and its thickness is the same as that of the welding part. The two pin bodies 2 are respectively used as the positive electrode and the negative electrode. Two electrode posts 3 are correspondingly provided on the top cover 1. The electrode posts 3 penetrate through the top cover 1. The two electrode posts 3 are arranged in one-to-one correspondence with the pin body 2. One of the electrode posts 3 is correspondingly used as the positive electrode, and the other electrode post 3 is used as the negative electrode. The transition parts 21 are correspondingly two. One transition part 21 is connected and fixed between the positive electrode post 3 and the pin body 2 used as the positive electrode, and the other transition part 21 is used as the negative electrode and fixed between the negative electrode post 3 and the pin body 2.

[0023] The transfer part 21 is provided with a mounting hole through which the electrode post 3 passes. One of the transfer parts 21 is provided with a fusing hole 26 near the pole ear part 22. The fusing hole 26 is a rectangular through hole or blind hole. The number of fusing holes 26 is multiple and arranged in a straight line. By arranging multiple fusing holes 26, a weakened area where high temperature or overcurrent fusing can occur is formed between the transfer part 21 and the pole ear part 22. In this embodiment, the fusing hole 26 is a rectangular through hole, and the number is three. The fusing holes 26 are distributed at intervals vertically and horizontally on the same straight line, that is, the middle fusing hole 26 is arranged vertically, and symmetrically arranged and horizontally arranged fusing holes 26 are distributed on both sides of it. Different from the conventional long-strip single fusing hole 26, in the present utility model, the connection strength between the transfer part 21 and the pin body 2 is ensured without affecting the fusing effect. In addition, there is another conventional fusing hole 26, the number of which is multiple, the shapes are the same and evenly distributed at equal intervals along a straight line. This kind of fusing hole 26 results in a poor strength of the fusing area and is easy to break or bend. In the present utility model, the grooving 24 serves as the primary fusing part, and the fusing hole 26 serves as the secondary fusing, realizing fusing at two parts, that is, double fusing insurance, to ensure the safe operation of the battery.

[0024] The present utility model is not limited to the above best implementation mode. Anyone can obtain other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in its shape or structure, as long as it has the same or similar technical solutions as the present application, it falls within the protection scope of the present utility model.

Claims

1. A pin with an indentation structure, comprising a pin body (2), and the pin body (2) is used to electrically connect the top cover (1) and the battery cell to each other. Characterized in that, A welding part (23) electrically connected to the tab of the battery cell is formed by bending on the pin body (2), so as to form a bending transition part (22) between the pin body (2) and the welding part (23). A grooving (24) is opened along the bending line on the inner wall of the bending transition part (22), so that the bending transition part (22) forms a thin-wall structure along the bending line. A plurality of thickening ribs (25) are formed in the grooving (24) and are distributed at intervals along its length direction; A transfer part (21) electrically connected to the electrode post (3) of the top cover (1) is also formed by bending on the pin body (2).

2. A pin with an indentation structure according to claim 1, Characterized in that, The pin body (2) is a conductive sheet, and the conductive sheet forms a transfer part (21), a bending transition part (22) and a welding part (23) after being bent twice.

3. A pin with an indentation structure according to claim 2, Characterized in that, The thickening ribs (25) are distributed at intervals along the bending line in the grooving (24).

4. A pin with an indentation structure according to claim 3, Characterized in that, The thickening ribs (25) located in the grooving (24) face the pin body (2) and the welding part (23) respectively before and after.

5. A pin with an indentation structure according to claim 4, Characterized in that, The bending angle between the welding part (23) and the pin body (2) is 90 degrees.

6. A pin with an indentation structure according to claim 5, Characterized in that, Both the welding part (23) and the pin body (2) are plate structures and have the same thickness.

7. A pin with an indentation structure according to claim 6, Characterized in that, The number of the pin bodies (2) is two, which are respectively located on both sides of the top cover (1), and the corresponding transfer parts (21) are also two. A fusing hole (26) is provided near the bending part of one of the transfer parts (21).

8. A pin with an indentation structure according to claim 7, Characterized in that, The fusing hole (26) is a through hole or a blind hole.

9. A pin with an indentation structure according to claim 8, Characterized in that, The shape of the fusing hole (26) is rectangular.

10. A pin with an indentation structure according to claim 9, Characterized in that, The number of the fusing holes (26) is multiple, and they are arranged at intervals vertically and horizontally on the same straight line.

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