Wound lithium-ion cell and preparation method thereof

A lithium-ion, wound-type technology, applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of easy shrinkage of the diaphragm, fire and explosion, short circuit of positive and negative electrodes, etc., and achieve the effect of improving the thermal abuse safety certification test

Pending Publication Date: 2020-05-15
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the market-oriented diaphragm is easy to shrink under high temperature environment, so that the positive and negative electrodes are in direct contact with each other, resulting in an internal short circuit, which in turn causes safety accidents such as fire and explosion.

Method used

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  • Wound lithium-ion cell and preparation method thereof
  • Wound lithium-ion cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a winding lithium ion battery, comprising a positive electrode sheet 1, a negative electrode sheet 2, and a separator 3 arranged between the positive electrode sheet 1 and the negative electrode sheet 2, and the side of the separator 3 facing the negative electrode sheet 2 is provided with a bonded Layer 4, the adhesive layer 4 is located on the upper edge and the lower edge of the separator 3, two adjacent separators 3 are bonded by the adhesive layer 4 and the negative electrode sheet 2 is wrapped inside.

[0029] Further, the length of the adhesive layer 4 is greater than the length of the negative electrode sheet 2 .

[0030] Further, the thickness of the adhesive layer 4 is 1 μm, and the width of the adhesive layer 4 is 1.5 mm.

[0031] Further, the melting point of the adhesive layer 4 is 80-120° C., and the melting point of the separator 3 is higher than the melting point of the adhesive layer 4 .

[0032] Further, the adhesive layer 4 d...

Embodiment 2

[0039] This embodiment provides a winding type lithium ion battery. The difference from Embodiment 1 is the bonding layer 4. The length of the bonding layer 4 is equal to the length of the negative electrode sheet 2. The bonding layer 4 is polypropylene glue. The layer 4 has a thickness of 0.6 μm and the adhesive layer 4 has a width of 1 mm.

[0040] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0042] This embodiment provides a winding lithium ion battery. The difference from Embodiment 1 is the bonding layer 4, which is polyacrylate glue, and the thickness of the bonding layer 4 is 3 μm. The width is 1mm.

[0043] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, in particular to a wound lithium-ion cell. The lithium-ion cell comprises a positive plate, a negative plate and diaphragms arranged between the positive plate and the negative plate, bonding layers are arranged on the faces, facing the negative plate, of the diaphragms and are located at the upper edges and the lower edges ofthe diaphragms, and every two adjacent diaphragms are bonded through the corresponding bonding layer and wrap the negative plate inside. Before winding, the bonding layers on the surfaces of the diaphragms completely seal the negative plate in the diaphragms by bonding the two opposite diaphragms, so that the situation of internal short circuit caused by the direct contact of the positive plates and the negative plates due to the thermal shrinkage of the diaphragms in a high-temperature state is avoided, and the safety accidents, such as fire, explosion, etc., cannot be caused, so that the thermal abuse safety certification test of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a wound lithium ion battery core and a preparation method thereof. Background technique [0002] With the rapid development and greater market demand in fields such as mobile phones, laptop computers, charging treasures, drones, electric tools and electric vehicles, people have higher and higher requirements for the energy density, fast charging and safety performance of lithium-ion batteries . Wound-type soft-pack lithium-ion batteries are widely produced due to their mature technology, high production efficiency and high energy density. [0003] The winding soft-pack lithium-ion battery consists of positive and negative electrodes, a separator and an electrolyte. Among them, the function of the separator is to isolate the positive and negative electrodes to prevent internal short circuit caused by direct contact between the positive and negative electrodes; at t...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M10/0525H01M2/16
CPCH01M10/0587H01M10/0525H01M50/411H01M50/449Y02E60/10Y02P70/50
Inventor 张志勇贺江凡朱坤庆计阳夏小勇陶德瑜
Owner 东莞维科电池有限公司
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