A liquid flow half-cell and a flow battery stack having the same

Abstract

The invention provides a flow half-cell and a flow cell stack with the same. The flow half-cell comprises a flow frame, a porous electrode and a bipolar plate, wherein the flow frame is provided with side frames and an electrode receiving cavity formed by the side frames; the porous electrode is embedded into the electrode receiving cavity of the flow frame and provided with a first flow channel for an electrolyte solution to flow; the bipolar plate is arranged on one side of the flow frame and is parallel to the porous electrode; an electrolyte guide inlet and an electrolyte guide outlet are arranged in the positions of the bipolar plate corresponding to the side frames; a second flow channel for the electrolyte solution to flow is formed in the surface of the bipolar plate facing to the porous electrode; and the electrolyte guide inlet and the electrolyte guide outlet are communicated with the second flow channel. The electrolyte solution is guided by the first flow channel of the porous electrode and the second flow channel of the bipolar plate, so that the surface area of permeation of the electrolyte solution to an entity part of the porous electrode is increased, the flow resistance of the porous electrode on the electrolyte solution in the flowing process is reduced, the flow pressure difference for the electrolyte solution in the flowing process is effectively reduced, and the charge and discharge efficiency of the flow cell is improved.

Description

Technical field [0001] The present invention relates to the design field of flow batteries, and in particular to a flow half-cell and a flow battery stack having the same. Background technique [0002] The all-vanadium redox flow battery is an electrochemical reaction device that performs redox with vanadium ion electrolytes of different valences, which can efficiently realize the mutual conversion between chemical energy and electrical energy. This type of battery has the advantages of long service life, high energy conversion efficiency, good safety, and environmental friendliness. It can be used in large-scale energy storage systems supporting wind power and photovoltaic power generation. It is the main choice for grid peak-shaving and valley-filling and load balancing. one. Therefore, in recent years, all-vanadium redox flow batteries have gradually become the focus of research on large-capacity energy storage batteries. [0003] All vanadium redox flow batteries use vanadium...

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Problems solved by technology

[0004] The flow of electrolyte in the existing flow battery stack generally depends on the permeation and mass transfer of porous electrodes. The efficiency of the battery system is reduced; on the other hand, the electrolyte flow inside the battery stack is uneven and the concentration polarization is large, which causes the internal loss of the battery stack, thereby reducing the voltage efficiency of the battery

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