DETECTION METHOD OF STATE OF CHARGE OF FLOW BATTERY

A detection method of a state of charge of a flow battery, comprising: providing a flow battery, executing a preliminary step, and executing a detection step; the preliminary step includes providing a detection device, operating the flow battery with at least one full charge and full discharge in a time interval, and obtaining a waveform according to the signal which is corresponding to a plurality of measured values and a plurality of time values in the time interval; defining the state of charge (SoC) values according to the waveform and obtaining a curve corresponding to the measured values and the plurality of state of charge values; the detection step includes detecting a negative electrode electrolyte and outputting the signal by the detection device; obtaining a value according to the signal; through the curve, one of the state of charge values corresponding to the value is obtained.