All-vanadium redox flow battery composite terminal electrode and preparation method thereof

Abstract

The invention discloses an all-vanadium redox flow battery composite terminal electrode and a preparation method thereof. The composite terminal electrode comprises a carbon felt, an electrode slice,an insulating plate outer frame slice and a copper electrode slice. A hollow cavity which is through front and back is formed in the middle of the insulating plate outer frame slice; the electrode slice is fused in the hollow cavity of the insulating plate outer frame slice; the electrode slice, the insulating plate outer frame slice, the copper electrode slice, the insulating plate outer frame slice and the electrode slice are sequentially stacked in an inner cavity of the die; a hot pressing die is used for preparing a terminal electrode blank; and the carbon felt is welded on the surface ofthe electrode slice on the terminal electrode blank through a resistance welding machine. The preparation method comprises the following steps of: cutting and preparing the terminal electrode blank assembly, carrying out hot press molding on the terminal electrode blank, machining a terminal electrode blank, and welding the carbon felt layer to prepare the composite terminal electrode. The surface contact resistance is effectively reduced, the voltage efficiency of the flow battery is improved, the assembly process is simplified, and the assembly sealing risk is reduced.

Description

technical field [0001] The invention relates to the technical field of manufacturing an all-vanadium redox flow battery, in particular to a composite terminal electrode of an all-vanadium redox flow battery and a preparation method thereof. Background technique [0002] Flow energy storage battery is a low-cost, high-efficiency, and environment-friendly flow energy storage battery, which has the advantages of high energy density and current efficiency, simple and easy-to-operate device, long service life, and low cost. At present, the mainstream flow batteries mainly include all-vanadium flow batteries and zinc-bromine flow batteries, which are mainly used in power grid peak shaving, renewable energy power generation such as wind energy and solar energy, and electric vehicles. Among them, the all-vanadium redox flow battery is a relatively mature type of market expansion. [0003] The bipolar plate is one of the key components of the flow battery, which plays the role of co...

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Problems solved by technology

like figure 1 As shown, the terminal electrode structure in the prior art is a split structure, that is, the carbon felt, the pole plate and the copper electrode are physically pressed together to achieve mutual contact and conduction. The contact resistance of this structure is extremely large, and the assembly is complicated. Prone to defects, while assembled with gaps, prone to liquid leakage

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