Bipolarity current collector and preparation method

A current collector and bipolar technology, which is applied in the field of bipolar current collector and its preparation, can solve the problems of battery short circuit, copper foil negative electrode oxidation, and increased safety hazards of high-voltage batteries, so as to increase safety and prevent short circuit Effect

Active Publication Date: 2013-07-24
BEIJING HAWAGA POWER STORAGE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the aluminum foil has holes, it will cause the copper foil negative electrode to be continuously oxidized
In addition, because the single cell is very thin, if copper-aluminum composite foil is used, it

Method used

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  • Bipolarity current collector and preparation method
  • Bipolarity current collector and preparation method
  • Bipolarity current collector and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Preparation of bipolar current collector: pre-treat the surface of the copper foil, and then coat the surface of the copper foil with an electrolyte-resistant polyurethane adhesive coating with a width smaller than that of the copper foil, dry it, and then compound on the surface of the polyurethane adhesive coating A layer of polyethylene film to prepare a polymer barrier layer with a thickness of 0.05 to 5 microns; then vacuum-evaporate aluminum to obtain an aluminum foil with a thickness of 0.01 to 30 microns on the copper foil surface with a polymer barrier layer. The obtained bipolar current collector is cut into square or circular small pieces, and the copper foil and aluminum foil on the edge of the small pieces are in conductive contact;

[0038] Preparation of insulating frame: co-extrude polyethylene terephthalate and maleic acid grafted polypropylene to obtain a double-layer film with a thickness of 10-500 microns, and open a square hole or a round hole in the ...

Embodiment 2

[0044] Prepare a high-voltage battery in the same manner as in Example 1, except that a layer of modified polyethylene with an area smaller than that of the bipolar current collector is coated on the surface of the aluminum foil during the preparation of the bipolar current collector, and dried; The polyethylene surface is coated with polyvinylidene fluoride coating containing carbon black conductive particles, dried and pressed into tablets.

Embodiment 3

[0046] A high-voltage battery was prepared in the same manner as in Example 1, except that the materials used for the insulating frame during the preparation of the composite bipolar current collector were biaxially stretched nylon and cast polypropylene, and the adhesive of the lining during the preparation of the high-voltage battery was Frame material is cast polypropylene.

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Abstract

The invention discloses a bipolarity current collector and a preparation method, which belongs to the chemical energy storage battery technical field. The provided bipolarity current collector comprises aluminum foil, a non-aluminum conducting layer and a polymer barrier layer positioned between aluminum foil and non-aluminum conducting layer; the edges of the aluminum foil and the non-aluminum conducting layer are partially or wholly conductively contacted, the width of a conductive contact area of the edges are 0.1-1.5 centimeters. The bipolarity current collector can avoid the occurrence of internal short circuit and cathode oxidation of the current copper aluminum laminated foils under the condition that a hole is existed; composite insulation frames are hot-pressed on the bipolarity current collector, and can avoid the occurrence of short circuit of the marginal part of the composite current collector, and the security of high voltage battery can be increased.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a bipolar current collector and a preparation method thereof. Background technique [0002] Energy crisis and environmental degradation have become the biggest obstacles to the development of traditional vehicles, and the development of electric vehicles is an effective means to alleviate these problems. One of the key technologies of electric vehicles is the power battery. At present, due to the advantages of high specific energy, high working voltage, long cycle life, low self-discharge, and no memory effect, lithium-ion batteries have attracted much attention as power batteries for electric vehicles. However, at present, the safety and consistency of power batteries for electric vehicles have become a technical bottleneck in the scale development of the electric vehicle industry. [0003] Internal stacking of electrodes in series to prepare high-vol...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/04
CPCY02E60/10Y02P70/50
Inventor 陈永翀李彦菊王秋平张萍韩立
Owner BEIJING HAWAGA POWER STORAGE TECH
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