The application relates to the technical field of a
vanadium redox flow battery, in particular to a circular structure reference battery for monitoring
electrode potential, which comprises an electrochemical unit and two circular units. The electrochemical unit comprises a
proton exchange membrane and
electrode assemblies symmetrically arranged on two sides of the
proton exchange membrane; the two circular units are symmetrically arranged on the two sides of the
proton exchange membrane, a closed
electrode cavity is formed between the circular unit and the proton exchange membrane, the electrode assemblies are arranged in the electrode cavity, a plurality of liquid inlet hole groups uniformly distributed in the circumferential direction are arranged on the circular unit, the plurality of liquid inlet hole groups are communicated with the circumferential edge of the electrode cavity; a liquid outlet
assembly is arranged on the circular unit, the liquid outlet
assembly is communicated with the central area of the electrode cavity, one end of the liquid outlet
assembly extends out of the circular unit,
electrolyte enters from the circumferential edge area of the electrode cavity through the plurality of liquid inlet hole groups, flows radially to the central area of the electrode cavity, and then flows out from the liquid outlet assembly. The application has the effects of providing a uniform flow field and ensuring stable and reliable signals.