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Gel electrolyte, battery cell containing same, paper shell battery and preparation method of paper shell battery

A gel electrolyte and cell technology, which is applied in the direction of electrolyte immobilization/gelation, secondary batteries, battery pack components, etc., can solve the problem of PP melting in the inner layer of aluminum-plastic film, easy generation of small holes, and poor sealing performance Good and other problems, to achieve the effect of reducing internal resistance, easy edge sealing, and reducing battery internal resistance

Pending Publication Date: 2017-05-31
HUINENG TIANJIN TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional soft-pack lithium-ion battery uses aluminum-plastic film as the outer packaging. The aluminum-plastic film is prone to small holes during the edge sealing process through heating, resulting in poor sealing. During the heating process, the inner layer pp of the aluminum-plastic film will melt, causing the Exposure of the layer leads to a short circuit, and there are easy gaps when sealing the edge, and the seal is not firm, especially at the joint between the tab and the aluminum-plastic film, there is often leakage

Method used

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  • Gel electrolyte, battery cell containing same, paper shell battery and preparation method of paper shell battery
  • Gel electrolyte, battery cell containing same, paper shell battery and preparation method of paper shell battery
  • Gel electrolyte, battery cell containing same, paper shell battery and preparation method of paper shell battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A gel electrolyte, mixed by PVDF-HFP, LiPF6 and a solvent in a mass ratio of 3:0.076:10; the viscosity is 4000 centipoise; the solvent is N-methylpyrrolidine and acetone in a mass ratio of 7:3 Mixed mixed solution; the concentration of LiPF6 electrolyte is 1mol / L.

[0048] A solid battery cell containing the above-mentioned gel electrolyte, comprising a positive electrode sheet and a negative electrode sheet; a gel electrolyte layer is provided between the positive electrode sheet and the negative electrode sheet; the positive electrode sheet and the negative electrode sheet are respectively attached to the gel The upper surface and the lower surface of the electrolyte layer; the thickness of the gel electrolyte layer is 30 μm.

[0049] Such as figure 1 , figure 2 As shown, a paper-shell thin-sheet lithium-ion battery containing the above-mentioned solid electric core includes a casing 1 and an electric core 3 packaged inside it;

[0050] The inner wall of the housi...

Embodiment 2

[0066] A gel electrolyte is formed by mixing PVDF-HFP, LiPF6 and a solvent at a mass ratio of 2.5:0.089:11; the viscosity is 3900 centipoise; the solvent is N-methylpyrrolidine and acetone at a mass ratio of 7:3 Mixed mixed solution; the concentration of LiPF6 electrolyte is 1mol / L.

[0067] A solid battery cell containing the above-mentioned gel electrolyte, comprising a positive electrode sheet and a negative electrode sheet; a gel electrolyte layer is provided between the positive electrode sheet and the negative electrode sheet; the positive electrode sheet and the negative electrode sheet are respectively attached to the gel The upper surface and the lower surface of the electrolyte layer; the thickness of the gel electrolyte layer is 35 μm.

[0068] A paper shell sheet lithium-ion battery containing the above-mentioned solid electric core, including a casing and an electric core encapsulated inside it;

[0069] An anti-corrosion layer is provided on the inner wall of th...

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Abstract

The invention provides a gel electrolyte, a battery cell containing the same, a paper shell battery and a preparation method of the paper shell battery. A paper shell thin lithium ion battery comprises a shell, a corrosion-resistant layer and a battery cell, wherein the corrosion-resistant layer is arranged on an inner wall of the shell, the battery cell is packaged in the shell, the shell material is gas-tight paper, a positive pole plate of the battery cell comprises a first substrate and a positive paste layer, a negative pole plate of the battery cell comprises a second substrate and a negative paste layer, the positive paste layer and the negative paste layer are both in close contact with the gel electrolyte, a tab is integratedly formed at one side, right opposite to the gel electrolyte, of each of the first substrate and the second substrate, and the two tabs both extend out of the shell. In the paper shell thin lithium ion battery provided by the invention, the gas-tight paper is used as outer package of the battery cell, the corrosion-resistant layer is arranged between the gas-tight paper and the battery cell, the internal resistance of the battery can be increased, the battery weight is reduced, the specific capacity is improved, and the bending frequency of the battery is increased.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a gel electrolyte, an electric core containing the electrolyte, a paper shell battery and a preparation method. Background technique [0002] With the continuous development of lithium battery technology and the continuous improvement of customers' requirements for lithium batteries, lithium-ion batteries are developing in the direction of lighter, thinner and higher capacity. Since the appearance of 18650, it has reached a peak in the field of lithium-ion batteries. In order to adapt to the development of productivity and realize the full utilization of lithium-ion batteries in various fields, researchers in this field hope to break the original shackles from all aspects, so there are thin-film batteries, high-power batteries, special-shaped batteries, etc. [0003] The existing lithium-ion battery aluminum-plastic film is difficult to seal and easy to leak, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0585H01M10/0525H01M2/02H01M2/26
CPCH01M10/0525H01M10/0565H01M10/0585H01M2300/0085H01M50/124H01M50/531Y02E60/10Y02P70/50
Inventor 刘强王琳霞韩越祖彤
Owner HUINENG TIANJIN TECH DEV CO LTD
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