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Copper strip welding method and lithium cell adopting the copper polar ear

A lithium battery and copper electrode technology, which is applied to battery pack components, circuits, electrical components, etc., can solve the problems of difficult welding of copper tabs and high production costs, and achieve the effects of simple production process, saving resources and reducing production costs

Inactive Publication Date: 2012-10-17
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unfortunately, because copper lugs are difficult to weld, the industry currently generally uses rare metal nickel strips that are scarce in resources as the tab 7, resulting in high production costs.

Method used

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  • Copper strip welding method and lithium cell adopting the copper polar ear
  • Copper strip welding method and lithium cell adopting the copper polar ear
  • Copper strip welding method and lithium cell adopting the copper polar ear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, a kind of welding method of copper strip, as image 3 shown, including the following steps:

[0035] The first step: place the copper strip to be welded on the conductive metal piece to be welded;

[0036] The second step: place another nickel strip on the copper strip to be welded;

[0037] Step 3: use spot welding equipment to spot weld the nickel strip, and weld the nickel strip, copper strip and the metal parts to be welded together. The welding current for spot welding is 100-150KA, the welding time and pulse width are 1-2 3ms, preferably: welding current 115-135KA, welding time and pulse width 1.5-2.5ms.

[0038] Step 4: Cut off the excess nickel strip at the weld.

Embodiment 2

[0039] Embodiment 2, a lithium battery using copper tabs, such as Figure 4 with Figure 5 As shown, it includes a battery cover plate assembly, a battery case 9, an electrolyte (not labeled in the figure), and a cell unit 8 wound by positive and negative electrodes and separator paper, and a nickel sheet (or nickel strip) 4 . Wherein the battery cover plate assembly includes a pressure plate 1, a cover plate 5, a connector 2 and a sealing insulator 3. The pressure plate 1 can be a copper plate, a steel plate or a conductive alloy plate. One of the negative tabs, the positive tab or the negative tab uses copper tabs 7 , and the sealing insulator 3 is located between the cover plate 5 and the pressure plate 1 to insulate them. The welding method of the copper tab 7 is to overlap the pressing plate 1 located inside the cover plate 5 and the nickel sheet 4 of the copper tab 7 in order and weld them together by spot welding. The welding current of the spot welding is 100-150KA. ...

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Abstract

The invention discloses a lithium battery adopting a copper tab, which comprises a battery cover assembly and a cell unit. The battery cover assembly comprises a pressure plate, a cover plate, a connecting member and a sealing insulation member. The pressure plate is positioned on the inner side of the cover plate and the sealing insulation member is positioned between the cover plate and the pressure plate for the insulating isolation therebetween. The positive plate and the negative plate of the cell unit are respectively connected with a positive tab and a negative tab. At least one of the positive tab and the negative tab is a copper tab. The lithium battery also comprises a nickel sheet and a pressure plate positioned on the inner side of the cover plate. One copper tab and the positioned are sequentially overlapped with each other and then are welded together through spot welding. According to the invention, copper strips can be conveniently welded and the rickets problem when the copper tab is welded with a pressure plate is solved. Meanwhile, the production cost of the lithium battery is reduced.

Description

technical field [0001] The invention relates to a copper strip welding method, in particular to a copper tab welding method in a lithium battery and a lithium battery using the copper tab. Background technique [0002] Because copper has good electrical conductivity, it has been widely used in various electrical places. However, copper is difficult to solder, which limits its application to a large extent. For example, a lithium battery is a high-capacity, high-power battery that has been widely used in various small devices, especially mobile phones, laptop computers, portable power tools, and the like. Such as figure 1 As shown, a lithium-ion battery is generally composed of a battery cover assembly, a battery case, an electrolyte, and a battery unit wound by positive and negative electrodes and separator paper. The structure of the battery cover plate assembly includes a pressure plate 1 , a connecting piece 2 , a cover plate 5 and a sealing insulating piece 3 , and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/007B23K9/23B23K9/32B23K9/095H01M2/26H01M2/04H01M50/147H01M50/531
CPCY02E60/10
Inventor 吴抗叶利华王雁斌
Owner ZHENGZHOU BAK BATTERY CO LTD
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