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Pole piece for button cell, button cell and preparation method of button cell

A button battery, pole piece technology, applied in secondary battery manufacturing, battery pack parts, winding/folding electrodes, etc. , Reduce the difficulty of the process and increase the effect of the effective use of space

Pending Publication Date: 2020-08-04
赣州诺威科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is one: to provide a pole piece for a button battery, which solves the problem that the bending part of the tab of the existing soft-packed button battery is easy to break the aluminum-plastic film, resulting in liquid leakage and inflation

Method used

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  • Pole piece for button cell, button cell and preparation method of button cell
  • Pole piece for button cell, button cell and preparation method of button cell
  • Pole piece for button cell, button cell and preparation method of button cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 2 As shown, a button battery pole piece, including:

[0043] Current collector 11;

[0044] The tab 12 is provided with a tab glue 13, and one end of the tab 12 has a welding area 121, and the tab 12 is welded to the current collector 11 through the welding area 121;

[0045] Wherein, at least a part of the tab glue 13 overlaps with the current collector 11 , and a bendable flexible portion 122 is formed between the welding area 121 and the tab glue 13 .

[0046] Furthermore, laser welding or ultrasonic welding can be used for welding the tab 12 and the current collector 11 , preferably ultrasonic welding is used to control the size of the welding spot 1211 more precisely. The tab glue 13 can partially overlap with the current collector 11 or fully overlap with the current collector 11. It is only necessary to ensure that the subsequent tab glue 13 can be extended to the seal of the aluminum-plastic film to play the role of insulation; preferably, Pre...

Embodiment 2

[0050] Such as Figure 3-5 As shown, a button battery includes a cell 2 wound from the pole piece 1 described in Example 1 and an aluminum-plastic film wrapped outside the cell 2, the aluminum-plastic film includes a first aluminum-plastic film and a second aluminum-plastic film Two aluminum-plastic diaphragms, the tab 12 is horizontally bent by the flexible part 122 and extends outward along the joint of the first aluminum-plastic diaphragm and the second aluminum-plastic diaphragm. Among them, the shape settings of the first aluminum-plastic diaphragm and the second aluminum-plastic diaphragm of the aluminum-plastic film can be adapted and changed according to the shape of the button battery, such as round or square, but it should be ensured that the first aluminum-plastic diaphragm and the second aluminum-plastic diaphragm The aluminum-plastic diaphragm is matched to meet the requirements of the subsequent packaging cell.

[0051] Preferably, the distance between the outwa...

Embodiment 3

[0055] The present embodiment provides a kind of preparation method of button battery, comprises the following steps:

[0056] S1, welding the tab 12 to the current collector 11 through the welding area 121;

[0057] S2, apply the tab glue 13 on the tab 12 and close to the welding area 121, make at least a part of the tab glue 13 overlap with the current collector 11, and reserve a flexible part 122 between the welding area 121 and the tab glue 13;

[0058] S3, punching the first aluminum-plastic diaphragm and the second aluminum-plastic diaphragm respectively;

[0059] S4. Place the battery cell 2 in the pit of the second aluminum-plastic diaphragm, and then cover the first aluminum-plastic diaphragm along the direction of the second aluminum-plastic diaphragm, so that the tab is bent horizontally by the flexible part 122 and Extending outward along the joint of the first aluminum-plastic film and the second aluminum-plastic film to complete the packaging of the aluminum-pla...

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Abstract

The invention provides a pole piece for a button cell, the button cell and a preparation method of the button cell. The pole piece comprises a current collector, and a tab which is provided with tab glue; one end part of the tab is provided with a welding area, and the tab is welded on the current collector through the welding area; at least one part of the tab glue is overlapped with the currentcollector, and a bendable flexible part is formed between the welding area and the tab glue. Compared with the prior art, the button cell has the advantages that at least one part of the tab glue is overlapped with the current collector, and the welding area of the tab is arranged at the end part, and thus the flexible part can be formed between the welding area and the tab glue for bending; the risk hidden danger that an aluminum-plastic film is extruded to be broken due to the fact that the tab is bent from the top to form a sharp corner is avoided due to the arrangement of the flexible part; and meanwhile, the tab is directly bent in the area of the flexible part, so that the problem that the aluminum-plastic film is punctured to cause liquid leakage and gas expansion is thoroughly solved.

Description

technical field [0001] The invention relates to the field of button batteries, in particular to a pole piece for a button battery, a button battery and a preparation method thereof. Background technique [0002] A button battery usually includes a cover, a casing and a cell. The cell is placed in the casing, and a closed space is formed by fastening the cover and the casing. Existing button batteries generally have the following two packaging methods, including hard shell packaging and soft package packaging. Among them, the encapsulation method of the hard shell mainly adopts the method of physical blockage and hard shell, but this kind of encapsulation effect is not stable. If the electrolyte is directly injected into the shell, there is a risk of electrolyte leakage. And the use of soft package, such as figure 1 As shown, the positive and negative tabs of the wound cell are usually located longitudinally at the head of the cell. When the aluminum-plastic film is package...

Claims

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Application Information

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IPC IPC(8): H01M2/26H01M2/34H01M10/04H01M50/538H01M50/572
CPCH01M10/0431H01M50/538H01M50/572Y02E60/10Y02P70/50
Inventor 叶柏青陈俊
Owner 赣州诺威科技有限公司
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