Bipolar plate of redox flow battery

Abstract

The invention discloses a bipolar plate of a redox flow battery. The bipolar plate mainly comprises three components, namely engineering plastic side frames, a conductive bipolar plate running through the side frames and a gasket clamped between the two side frames, wherein the engineering plastic side frames are made of engineering plastic with better corrosion resistance, a flow passage for prolonging the contact distance between electrolyte and conductive graphite is engraved at an inlet and outlet, and the electrolyte can enter into and exit from the battery via the flow passage; the conductive bipolar plate adopts a high-density graphite plate, and diversion grooves which are suitable for distribution of the electrolyte of the redox flow battery are engraved on the two sides of the graphite plate; the gasket is made of the engineering plastic with better corrosion resistance, the inlet and outlet which is consistent with that on the side frames is engraved on the gasket, and the three components are bonded through silicon rubber and other glue with the better corrosion resistance to form the sandwich bipolar plate: the graphite bipolar plate and the gasket are arranged in the middle, and the two side frames are arranged on the upper side and the lower side. The bipolar plate disclosed by the invention can be suitable for the redox flow batteries taking graphite felts as electrodes and taking carbon cloth as the electrodes.

Description

technical field [0001] The invention relates to a device for converting chemical energy into electric energy, especially for processing and manufacturing bipolar plates of liquid flow batteries. Background technique [0002] All vanadium redox flow battery (VRB for short) uses a vanadium electrolyte system, and the positive and negative active materials exist in the redox electrolyte. The all-vanadium redox flow battery system includes two electrolyte storage tanks with vanadium ions in different oxidation states, which are positive electrode V(IV) / V(V) and negative electrode V(II) / V(III) redox electrode pairs . The electrolyte is circulated between the storage tank and the stack by a pump. The stack consists of multiple battery packs, each pack having two half-cell sections separated by a proton exchange membrane. In a half-cell stack, an electrochemical reaction is carried out on carbon plate electrodes, generating an electric current to charge and discharge the battery...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a device with the advantages of simple structure, convenient manufacture, reliable sealing, pressure resistance during the assembly process of the stack, and flexible and adjustable active area of ​​the stack, which overcomes the difficulty of processing large-area graphite plates, Fragile shortcomings, and can be applied to flow battery bipolar plates with graphite felt as electrodes and carbon cloth as electrodes

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