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Lithium battery and preparation method therefor

A lithium battery and cell technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problem of positive electrode/negative electrode coiling, restricting the development of thinner batteries, positive electrode/negative electrode lug and production The core operation is difficult and other problems, to achieve the effect of reducing the thickness

Active Publication Date: 2016-01-20
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to propose a kind of lithium battery and preparation method thereof, to solve existing in the prior art if the area of ​​the powder area is smaller than the area of ​​the non-powder area, the phenomenon of positive electrode sheet / negative electrode sheet curling is serious, the electrode sheet is cut, The operation of spot welding the positive tab / negative tab and making the core is very difficult, and it is difficult to effectively control and mass produce, which limits the technical problems of the battery to a thinner direction

Method used

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  • Lithium battery and preparation method therefor
  • Lithium battery and preparation method therefor
  • Lithium battery and preparation method therefor

Examples

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Effect test

Embodiment 1

[0029] Such as Figure 1-3 As shown, a lithium battery includes a flat wound cell. The wound cell includes two plates, a positive plate 1 and a negative plate 2, respectively, and a separator 3 is arranged between the two plates. ;

[0030] The end of the pole plate is provided with a spot welding empty foil area 4 for connecting the tab 5, the front of the pole plate is the powder area 6, the back includes the powder area 6 and the non-powder area 7, and the non-powder area 7 on the back of the electrode plate is located Spot welding between the empty foil area 4 and the powder area 6, and the area of ​​the non-powder area 7 is not greater than the area of ​​the powder area 6;

[0031] The ends of the two pole plates face oppositely, and the two tabs 5 are arranged at the two ends of the wound cell in the width direction, and are respectively located at the top and bottom of the wound cell.

[0032] In the lithium battery provided by the foregoing embodiment, the area of ​​the non-...

Embodiment 2

[0035] Such as Figure 1-3 As shown, a lithium battery includes a flat wound cell. The wound cell includes two plates, a positive plate 1 and a negative plate 2, respectively, and a separator 3 is arranged between the two plates. ;

[0036] The end of the pole plate is provided with a spot welding empty foil area 4 for connecting the tab 5, the front of the pole plate is the powder area 6, the back includes the powder area 6 and the non-powder area 7, and the non-powder area 7 on the back of the electrode plate is located Spot welding between the empty foil area 4 and the powder area 6, and the area of ​​the non-powder area 7 is not greater than the area of ​​the powder area 6;

[0037] The ends of the two pole plates face oppositely, and the two tabs 5 are arranged at the two ends of the wound cell in the width direction, and are respectively located at the top and bottom of the wound cell.

[0038] The head end of the diaphragm 3 is located inside the wound cell, and the end of th...

Embodiment 3

[0045] Such as Figure 1-4 As shown, a method for preparing a lithium battery includes the following steps:

[0046] Prepare positive plate 1 and negative plate 2; reserve spot welding empty foil area 4 at the end of the plate, the front of the plate is powder area 6, the back part is powder area 6, reserved non-powder area 7, non-powder area 7 Located between the powder area 6 and the spot welding empty foil area 4, and the width of the non-powder area 7 is not greater than the width of the powder area 6, the powder area 6 of the positive plate 1 is coated with positive electrode powder, and the spot welding empty foil area 4 is connected to the positive electrode Ears, the powder area 6 of the positive plate 1 is coated with negative powder, and the empty foil area 4 is spot welded to connect the negative ear;

[0047] Winding molding: Wrap the middle of the separator 3 into an S shape including two openings. Place the beginning ends of the positive electrode plate 1 and the neg...

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Abstract

The invention discloses a lithium battery and a preparation method therefor. The lithium battery comprises a tabular winding type electric core; a non-powder region on the back surface of a polar plate is positioned between a point-welding empty foil region and a powder region; the area of the non-powder region is not larger than that of the powder region; the tail ends of the two polar plates are opposite in directions; two tabs are arranged at the two ends of the winding type electric core in the width direction, and the two tabs are positioned on the top and at the bottom of the winding type electric core respectively. According to the lithium battery and the preparation method therefor provided by the invention, the situation that the pole pieces are rolled and wound caused by the over-large area of the non-powder region, so that the slitting of the pole pieces, the point welding of the tabs and the manufacturing of the coiled cores are not affected; and meanwhile, by adoption of the staggered manner of the tabs and the non-powder region, the thickness of the overall winding type electric core is reduced, so that the preparation method is suitable for the production of thinner lithium batteries, in particular suitable for mass production of polymer ultra-thin batteries with thicknesses of less than 1.0 mm.

Description

Technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular to a lithium battery and a preparation method thereof. Background technique [0002] The soft-packed lithium-ion battery has the advantages of light weight, good safety performance, and can be customized to any size, so it is used in mobile electronic devices such as Bluetooth, 2G / 3G / 4G mobile phones, medical products, wearable products, bank payment products, and portable mobile power supplies. The application in other fields is increasingly widespread. [0003] Ultra-thinning is an important direction for the development of electronic products. Therefore, the ultra-thinning of electronic products inevitably requires the ultra-thinning of batteries. With the development of science and technology, the application fields of ultra-thin polymer lithium batteries are becoming more and more extensive, such as the use of bank payment USB shields, credit cards and wearable ...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M4/72H01M2/26H01M10/0525H01M50/536H01M50/538
CPCH01M4/72H01M10/0525H01M10/0587H01M50/531Y02E60/10Y02P70/50
Inventor 田华葛辉明吕正中余小文刘金成
Owner EVE ENERGY CO LTD
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