Tab switching structure

Abstract

The utility model relates to the technical field of tab switching, in particular to a tab switching structure. The tab connection structure comprises a tab connection middle piece, and the tab connection middle piece comprises a connection end part for connecting a positive tab, a connection end part for connecting a positive pole of a circuit, and a middle piece for integrally connecting the connection end part and the connection end part. According to the utility model, the tab extending out of the battery is matched with the positive electrode and the negative electrode of the circuit board in a switching manner, specifically, the connecting end part of the tab switching middle piece is connected with the positive tab, and the switching end part is adjusted to a proper position according to actual requirements by matching with the middle structure, so that the adjustment of the tab distance can be realized; therefore, the tab spacing of the battery is conveniently matched with the positive and negative electrodes of the circuit board. The use value is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of tab transfer, in particular to a tab transfer structure. Background Art

[0002] As an important part of the raw materials of lithium batteries, tabs, as metal conductors that extend the positive and negative electrodes of the battery cell from the inside, play a role in guiding current. Referring to the accompanying drawings of the specification Figure 1 , a battery generally consists of an aluminum tab and a nickel tab. Usually, the positive electrode is the aluminum tab and the negative electrode is the nickel tab.

[0003] When designing a battery, there is a certain distance between the aluminum tab and the nickel tab, which is called the tab spacing. The battery with a certain tab spacing is subsequently welded to the circuit board and assembled in the terminal application. This requires that the tab spacing of this battery matches the welding distance of the circuit board. However, during the battery production process, due to process factors and design convenience considerations, the tab spacing cannot completely match the positive and negative electrodes of the circuit board. This results in that the battery with a certain tab spacing cannot be welded and assembled to the circuit board in the terminal application subsequently. To solve this technical problem, it is currently known to match the positive and negative electrodes of the circuit board by means of tab transfer extending outside the battery. However, generally, the tab transferred is the positive tab because the aluminum tab of the positive electrode is relatively soft. After welding the circuit board, the circuit board will fold back to the top seal position of the battery. If the aluminum material is repeatedly folded back, it is easy to break. Summary of the Utility Model

[0004] Aiming at the technical problems existing in the prior art, the utility model discloses a tab transfer structure to solve the technical problems that the tab spacing of a single battery does not match the positive and negative electrodes of the circuit board, and the positive tab is easily broken.

[0005] The utility model provides a tab transfer structure, which includes: a tab transfer intermediate piece. The tab connection intermediate piece includes: a connection end for connecting the positive tab, a transfer end for connecting the positive electrode of the circuit, and an intermediate piece integrally connecting the connection end and the transfer end.

[0006] Optionally, the connection end is used to overlap on the positive tab and is welded.

[0007] Optionally, the welding connection is laser welding or resistance welding.

[0008] Optionally, the diameter of the laser welding or resistance welding solder joint is between 0.2 and 0.5 mm. The laser solder joints or resistance solder joints are arranged in 1 to 2 rows. When the solder joints are arranged in 2 rows, they are arranged in parallel.

[0009] Optionally, the width of the connection end is 2 to 5 mm.

[0010] Optionally, the width of the transition end is 2-5 mm.

[0011] Optionally, the intermediate member includes an intermediate connecting piece, and the intermediate connecting piece is fixed in parallel at a top thermal packaging position between the positive electrode tab and the negative electrode tab.

[0012] Optionally, the width of the middle connecting piece is 2-4 mm.

[0013] Optionally, the tab transfer intermediate sheet is integrated as a whole by metal stamping.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model can realize the conversion of the pole lug spacing by the pole lug transfer intermediate piece, which is helpful for the butt welding with the positive and negative poles of the fixed circuit board, and effectively solves the problem of the mismatch between the pole lug spacing of a single battery and the positive and negative poles of the circuit board; at the same time, the pole lug transfer intermediate piece enables the pole lug transfer intermediate piece extending out of the battery to reduce the bending deformation of the positive pole lug when the circuit board is folded back to the top sealing position of the battery after welding the circuit board, so as to avoid the situation that the positive pole lug of aluminum material is easy to break due to repeated folding; the utility model covers the transfer methods of different pole lug spacings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the electrode ear in the prior art;

[0017] Figure 2 This is a structural diagram of the tab transfer intermediate sheet of the utility model;

[0018] Figure 3 The first embodiment of the tab transfer structure;

[0019] Figure 4 The second embodiment of the tab transfer structure in Example 1;

[0020] Figure 5 The third embodiment of the tab transfer structure in Example 1;

[0021] Figure 6 The fourth embodiment of the tab transfer structure in Example 1;

[0022] Figure 7 This is the fifth method of the tab transfer structure in Example 1.

[0023] List of reference numerals:

[0024] 10: positive electrode ear; 11: negative electrode ear; 12: overall structure of the battery; 13: battery top seal packaging position;

[0025] 20: Tab transfer intermediate piece; 21: Connection end; 22: Intermediate piece; 23: Transfer end. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0027] Example 1

[0028] Combination Figure 2 The present embodiment provides a tab transfer structure, which includes a tab transfer intermediate sheet, wherein the tab connection intermediate sheet includes: a connection end for connecting a positive tab, a transfer end for connecting a positive pole of a circuit, and an intermediate structure for integrally connecting the connection end and the transfer end.

[0029] Generally speaking, a battery is assembled by heat packaging with a positive electrode ear 10 (width 1~5mm) and a negative electrode ear 11 (width 1~5mm) at a certain ear spacing S1 (greater than 0mm). The width of the top heat packaging position 13 is generally 2~5mm. 0 The width of the battery body is L, and the tab transfer intermediate sheet 20 has a width greater than the body width L in several preferred embodiments of this embodiment. 0 There are also some that do not exceed the body width L 0 of.

[0030] The tab transfer intermediate piece in this embodiment is connected to the positive tab via the connecting end, and then the intermediate structure can adjust the transfer end to a suitable position according to actual matching requirements, thereby achieving adjustment of the tab spacing to match the positive and negative poles of the circuit board without the need for deformation adjustment of the positive tab.

[0031] At the same time, this method allows the tab transfer intermediate piece extending out of the battery to reduce the bending deformation of the positive tab when the circuit board is folded back to the top seal position of the battery after welding, thereby avoiding the situation where the aluminum positive tab is easily broken due to repeated folding.

[0032] The overall structure 20 of the tab transfer intermediate sheet consists of three parts, namely, a connection end, a transfer end, and a middle piece. The connection end 21 is also the left structure of the tab transfer intermediate sheet, and its width L2 is about 2-5 mm; the middle piece 22 is also the middle structure of the tab transfer intermediate sheet, and its width L2 is about 2-4 mm; the transfer end is also the right structure 23 of the tab transfer intermediate sheet, and its width L3 is about 2-5 mm. The whole is integrated by metal stamping.

[0033] Combined with Figure 1 ; S1 is the original tab spacing, combined with the attached Figure 2, S2 is the distance between the left and right structures of the tab adapter; Figures 3 - 7 ; S3 / S4 / S5 / S6 / S7 (methods 1-5 of this embodiment) are the desired spacing between the tabs after the transfer. The length of S2 can be determined based on S3 / S4 / S5 / S6 / S7 being the spacing between the tabs after the transfer.

[0034] Example 2

[0035] The difference between this embodiment and embodiment 1 is that: Figure 3 The connection end 21 of the tab transfer intermediate sheet 20 overlaps the positive tab 10, and the connection end 21 and the positive tab 10 are connected by laser welding or resistance welding. The diameter of the laser weld or resistance weld is between 0.2 and 0.5 mm, and the laser or resistance weld points are arranged in 1 to 2 rows.

[0036] The middle piece 22 is placed parallel to the top heat packaging position 13, and is laterally adhered to the surface of the top heat packaging position 13 by adhesive tape to fix the middle piece 22. In this way, the conversion of the tab spacing is achieved, which is helpful for butt welding with the positive and negative electrodes of the fixed circuit board.

[0037] And several other methods of this embodiment, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 In the same way, the conversion of the distance between the tabs is achieved, which helps to fix the butt welding of the positive and negative poles of the circuit board and reduce the possibility of the positive tab breaking due to multiple bending.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A tab transfer structure, characterized in that: include: A tab transfer intermediate sheet (20), the tab connection intermediate sheet comprising: a connection end (21) for connecting a positive tab, a transfer end (23) for connecting a positive electrode of a circuit, and an intermediate piece (22) for integrally connecting the connection end (21) and the transfer end (23); the connection end (21) is used to overlap the positive tab and be welded; the diameter of the weld point of the weld connection is between 0.2 and 0.5 mm, and the weld points are arranged in 1 to 2 rows; the width of the connection end (21) is 2 to 5 mm; the width of the transfer end (23) is 2 to 5 mm; the intermediate piece (22) comprises an intermediate connecting sheet, the intermediate connecting sheet is fixed in parallel at a top heat packaging position between the positive tab and the negative tab; the width of the intermediate connecting sheet is 2 to 4 mm.

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