Bipolarity current collector and preparation method

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...

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 is easy to cause the edges of the two current collectors to contact, resulting in a short circuit of the battery. The existence of these problems will increase the safety hazard of high-voltage batteries.

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