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A lithium battery diaphragm

A lithium battery diaphragm and film layer technology, which is applied to battery pack components, circuits, separators/films/diaphragms/spacer components, etc., can solve the problems that the blocking effect cannot be achieved, and the local heating rate of the diaphragm perforation cannot be reduced. , to achieve the effect of increasing battery capacity, ensuring safety, and reducing overall weight

Active Publication Date: 2017-08-01
BENQ MATERIALS WUHU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both types have a blocking layer and a supporting layer. When the diaphragm is punctured, local heating will begin to occur. At this time, if the blocking layer of the diaphragm can quickly melt and close the pores, it can prevent the battery from exploding due to heat. However, when the local heating When the speed is greater than the melting speed, the blocking effect cannot be achieved
[0004] Today's diaphragms use aluminum oxide as coating particles to coat the base layer, which can make the diaphragm have a high heat resistance temperature, but it cannot reduce the heating rate of the perforated part of the diaphragm; when the heating rate of the perforated part of the diaphragm is greater than the melting speed of the base layer , the blocking effect cannot be achieved

Method used

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  • A lithium battery diaphragm
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Examples

Experimental program
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Effect test

Embodiment approach 1

[0040] Embodiment 1, take 1% of polyvinylidene fluoride, 5% of silicon dioxide particles with an average diameter of 20um to 30um, 95% of acetone and 4% of butanol, mix them, stir and disperse them to form a hollow silicon dioxide Particle mixture; select polyethylene porous film as the base layer; evenly coat the silica hollow particle mixture on both sides of the polyethylene porous film; after the silica hollow particle mixture is dried, a 40um silica hollow particle film layer is formed .

Embodiment approach 2

[0041] Embodiment 2: Mix 10% of polyvinylidene fluoride, 8% of silicon dioxide particles with an average diameter of 40um to 50um, 79% of acetone and 3% of ethanol, stir and disperse them to form hollow silica particles Mixture; select polyethylene porous film as the base layer; evenly coat the silicon dioxide hollow particle mixture on one side of the polyethylene porous film; after the silicon dioxide hollow particle mixture is dried, a 60um silicon dioxide hollow particle film layer is formed.

Embodiment approach 3

[0042] Embodiment 3, take 5% of polyvinylidene fluoride, 10% of polymethyl acrylate particles with an average diameter of 20um to 30um, 80% of methyl ethyl ketone and 5% of ethanol, mix them, stir and disperse them to form polymethylacrylate Ester hollow particle mixture; select polypropylene porous film as the base layer; evenly coat the polymethyl acrylate hollow particle mixture on both sides of the polyethylene porous film; after the polymethyl acrylate hollow particle mixture is dried, a 40um Polymethyl acrylate hollow particle film layer.

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Abstract

The invention discloses a lithium battery separator, which is composed of a base layer and an organic or inorganic hollow particle film layer arranged on one side of the base layer or on both sides of the base layer; the lithium battery separator consists of a hollow particle film layer Coated on the substrate, after the diaphragm is punctured, the hollow structure can reduce the overall heat conduction rate, so that the substrate can have more time to melt and close the cells, thereby playing a role of safety blocking. The lithium battery separator can ensure the safety of the battery, and at the same time, compared with the multilayer structure separator and the ceramic coating separator, the hollow particles can reduce the overall weight of the battery, and at the same time, the battery capacity can be greatly improved.

Description

technical field [0001] The invention relates to a lithium battery, in particular to a lithium battery diaphragm. Background technique [0002] Lithium-ion batteries are mainly composed of four major materials: positive electrode material, negative electrode material, electrolyte, and separator. The separator is a microporous film placed between the positive and negative electrodes of the battery, which allows lithium ions to pass through freely, while blocking the direct contact of the positive and negative electrodes to prevent short circuits. like image 3 , Figure 4 and Figure 5 As shown, when the separator is pierced by external force or the inside of the battery, a short circuit will occur inside the battery. At this time, the separator must be able to melt and close the pores immediately to block the location of the short circuit, so as to avoid the battery from thermal explosion and explosion. [0003] There are two types of separators today that can play this ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/443H01M50/449H01M50/451H01M50/457
CPCH01M50/463Y02E60/10
Inventor 陈信维
Owner BENQ MATERIALS WUHU CORP