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Soft package lithium ion battery and manufacturing method thereof

A technology of lithium-ion batteries and manufacturing methods, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of accelerating the damage of bending parts, affecting the yield of batteries, and cracking of battery shells, so as to solve the problems of cracking, implementing Convenience and low cost effect

Inactive Publication Date: 2010-02-03
东莞市欣卓电讯材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bent battery does not break before liquid injection, but after liquid injection and charging, due to the action of the electrolyte, the damage of the bent part will be accelerated, causing the battery case to rupture and leak, which will greatly affect the battery life. Yield

Method used

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  • Soft package lithium ion battery and manufacturing method thereof
  • Soft package lithium ion battery and manufacturing method thereof
  • Soft package lithium ion battery and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The flexible packaging lithium ion battery of the present invention, as image 3 As shown in , it includes a battery cell 1; the battery cell 1 includes a pole core, an electrolyte, and a shell that wraps and heat-seals the pole core, and the electrolyte is sealed in the shell; after the shell wraps and heat-seals the pole core; the battery cell 1 is formed A pair of folded edges 11, a tab lead-out edge 13 and two sides 12, 14 are heat-sealed again at the bottom angle 10 where the folded edge 11 intersects with the two sides 12, 14. Positive and negative pole lugs 15 are drawn out from pole ear lead-out edge 13; Figure 4 As shown in , the battery cell 1 and the protective circuit board 4 are placed in plastic casings 30, 31, and packaged to form a soft-packed lithium-ion battery.

[0019] both sides like image 3 14 is shown on the left and 12 on the right.

[0020] Pole cores can be those known to those skilled in the art. The pole core includes a positive electro...

Embodiment 2

[0036] This example will focus on describing the manufacturing method of the lithium ion battery of the present invention.

[0037] A method for manufacturing a flexible packaging lithium-ion battery, comprising the steps of:

[0038] a) The positive electrode sheet, diaphragm, and negative electrode sheet are sequentially wound or stacked to form a pole core; the positive electrode sheet, separator, and negative electrode sheet have been described in Example 1, and are well known to those skilled in the art; no further explanation will be given.

[0039] b) After folding a casing in half, put the pole core between the two folded surfaces of the folded casing to form a tab lead-out edge 113, a pair of folded edges 11, and two sides 12, 14; put the tab lead-out edge 13 and the two The sides 12 and 14 are heat-sealed, and liquid is injected inward to form the cell 1;

[0040] Such as image 3 As shown, in order to prevent the aluminum-plastic composite film from cracking after...

Embodiment 3

[0046] In this embodiment, 100 batteries that were heat-sealed at the bottom corners were used to bend 5 times, 10 times, and 15 times, and then the number of batteries with membrane rupture and leakage was counted; the battery was bent 200 times and injected with liquid The number of broken membranes and liquid leakage; use 100 traditional batteries that have not been heat-sealed again at the bottom corners and bend them 5 times, 10 times, and 25 times, and then count the number of batteries with membrane ruptures and liquid leakage; The amount of liquid leaking from the battery membrane after the liquid injection.

[0047] As shown in the table below, it is obvious that after the bottom corner is heat-sealed, the film will not break and leak after repeated bending, which meets the needs of production and greatly improves the yield.

[0048]

[0049]

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Abstract

The invention discloses a soft package lithium ion battery, which comprises a battery cell. The battery cell comprises a pole shank, an electrolyte and a shell enwrapping and heat-sealing the pole shank, wherein the electrolyte is sealed in the shell; and after the shell enwraps and heat-seals the pole shank, the battery cell forms a pair of hems, a pole lug outlet edge and two side edges, the bottom corner at the intersection of the hems and the two side edges is a round corner which is formed through further hot pressing. The invention simultaneously discloses a method for manufacturing thesoft package battery. After the shell performs heat seal to form the battery cell, the bottom corner at the intersection of the hems and the two side edges is heat-sealed again. By adopting the schemeof the invention, the problem that the bottom corner is easy to crack in the process of manufacturing the soft package lithium ion battery is solved successfully. The method is simple, is convenientto implement, has low cost, and can practically solve the problem of complex film cracking at the bottom corner of the battery.

Description

【Technical field】 [0001] The invention relates to the field of soft packaging lithium ion batteries. 【Background technique】 [0002] Compared with hard-shell batteries, soft-pack batteries have different manufacturing processes, and the corresponding procedures are also different. The flexible packaging lithium-ion battery industry now generally adopts the process of winding or stacking the positive electrode sheet, separator, and negative electrode sheet in sequence to form the core; Then heat-seal the lead-out side of the tab and the two sides to form a flexible package battery cell with a pair of folded edges, a lead-out side of the tab and two sides. There are still a few battery manufacturers using automated production lines. Most of them are manual or semi-automatic lines. The batteries go through multiple manual processes, and the handling of each process by employees will cause damage to the battery to varying degrees. Such as figure 1 , figure 2 As shown in , t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M2/02H01M50/105H01M50/129H01M50/148H01M50/183
CPCY02E60/12Y02E60/10
Inventor 姚保同吴银华
Owner 东莞市欣卓电讯材料有限公司
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