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A kind of lithium battery and preparation method thereof

A lithium battery and cell technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problem of positive plate/negative plate rolling, difficult operation of plate core winding, and limit the development of thinner batteries and other issues to achieve the effect of reducing the thickness

Active Publication Date: 2018-04-13
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 plate / negative plate curling is serious, the plate 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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  • A kind of lithium battery and preparation method thereof
  • A kind of lithium battery and preparation method thereof
  • A kind of lithium battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like Figure 1-3 As shown, a lithium battery includes a flat winding type battery core, the winding type battery core includes two pole plates, respectively a positive plate 1 and a negative plate 2, and a diaphragm 3 is arranged between the two pole plates ;

[0030] The ends of the pole plates are all provided with spot welding empty foil areas 4 for connecting the pole lugs 5. The front side of the pole plate is the powder area 6, and the back includes the powder area 6 and the non-powder area 7. The non-powder area 7 on the back of the pole plate is located at the Spot welding between the empty foil area 4 and the powder area 6, and the area of ​​the non-powder area 7 is not larger than the area of ​​the powder area 6;

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

[0032] In t...

Embodiment 2

[0035] like Figure 1-3 As shown, a lithium battery includes a flat winding type battery core, the winding type battery core includes two pole plates, respectively a positive plate 1 and a negative plate 2, and a diaphragm 3 is arranged between the two pole plates ;

[0036] The ends of the pole plates are all provided with spot welding empty foil areas 4 for connecting the pole lugs 5. The front side of the pole plate is the powder area 6, and the back includes the powder area 6 and the non-powder area 7. The non-powder area 7 on the back of the pole plate is located at the Spot welding between the empty foil area 4 and the powder area 6, and the area of ​​the non-powder area 7 is not larger than the area of ​​the powder area 6;

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

[0038] The ...

Embodiment 3

[0045] like Figure 1-4 As shown, a preparation method of a lithium battery includes the following steps:

[0046]Prepare the positive plate 1 and the negative plate 2; reserve the spot welding empty foil area 4 at the end of the pole plate, the front side of the pole plate is the powder area 6, the back part is the powder area 6, and the non-powder area 7 and the non-powder area 7 are reserved. It is 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 powder, and the spot welding empty foil area 4 is connected to the positive electrode ear, the powder area 6 of the positive plate 1 is coated with negative electrode powder, and the spot welding empty foil area 4 is connected to the negative electrode ear;

[0047] Winding forming: winding the middle of the diaphragm 3 into an S shape including two op...

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Abstract

The invention discloses a lithium battery and a preparation method thereof, comprising a flat winding battery core, the non-powder area on the back of the pole plate is located between the spot-welded empty foil area and the powder area, and the area of ​​the non-powder area is Not larger than the area of ​​the powder area; the ends of the two pole plates face opposite, and the two tabs are arranged at both ends of the width direction of the wound battery core, and are respectively located on the wound battery core top and bottom of . The lithium battery and the preparation method thereof provided by the present invention avoid the roll-up of the pole plate caused by the excessive area of ​​the non-powder area, and therefore, will not affect the cutting of the pole plate, spot welding of tabs and production of winding cores. At the same time, by staggering the tabs and the powder area, the thickness of the overall wound battery is reduced, which can be applied to the production of thinner lithium-ion batteries, especially for ultra-thin polymers with a thickness of less than 1.0mm. Mass production of batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery and a preparation method thereof. Background technique [0002] Soft-pack lithium-ion batteries have the advantages of light weight, good safety performance, and can be customized to any size, so they are used in mobile electronic devices such as Bluetooth, 2G / 3G / 4G mobile phones, medical products, wearable products, bank payment products, and portable power banks. and other fields are increasingly widely used. [0003] Ultra-thinning is an important direction for the development of electronic products. Therefore, the ultra-thinning of electronic products must require 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 application in bank payment USB shield, credit card and wearable products. [0004] At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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