Novel bipolar plate for vanadium battery and preparation method of novel bipolar plate

Abstract

The invention relates to the field of the manufacture of vanadium batteries, in particular to a novel bipolar plate for a vanadium battery and a preparation method of the novel bipolar plate and solves the problems of great physical internal resistance, low voltage efficiency, uneven voltage of a single piece and the like of the battery in the prior art. The bipolar plate disclosed by the invention consists of four parts, namely a carbon material, a grid-shaped two-side through-hole resin plate, a conductive filler and a carbon material. The grid-shaped two-side through-hole resin plate and the conductive filler are used as a framework layer to be firstly manufactured into a low conductive plastic plate through a hot-press method. Then, the composite carbon materials on both sides of the low conductive plastic plate are subjected to hot press molding again so as to obtain the novel high conductive bipolar plate for the vanadium battery. According to the working requirements of the vanadium battery, for most of the existing bipolar plates, the process of using multiple steps of mixing or stirring and the like is simplified, the preparation process is simple, and only the production device namely a hot press is adopted to complete processing. The bipolar plate disclosed by the invention has high electric conductivity, the contact resistance between electrodes and the bipolar plate is very little, the physical internal resistance of the vanadium battery can be greatly reduced, the energy capacity of the vanadium battery can be increased, and therefore, the cost of the vanadium battery is reduced.

Description

technical field

[0001] The invention relates to the field of vanadium battery manufacturing, in particular to a novel bipolar plate for a vanadium battery and a preparation method thereof. Background technique

[0002] Vanadium battery, the full name of vanadium ion redox flow battery, is a new type of green battery. The bipolar plate is one of the key components of the all-vanadium redox flow battery. It plays the role of connecting the positive and negative electrodes of different single cells and conducting the internal circuit of the battery. It is required to have good electrical conductivity, high mechanical strength, and electrochemical corrosion resistance. performance. At present, the bipolar plates that can be used in vanadium batteries include graphite plates: high cost, difficult processing, and small size; metal plates: not resistant to corrosion, high cost; conductive plastics: low cost, poor conductivity, and low mechanical strength. To meet the commercializ...

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