Redox flow battery, electrical quantity measurement system, and electrical quantity measurement method

An electrical quantity measurement system which is configured to measure a quantity of electricity when a predetermined amount of electrolyte is discharged, for at least one of a positive electrolyte and a negative electrolyte supplied to a battery cell of a redox flow battery, the electrical quantity measurement system comprising:

• an electrolytic cell having a working electrode to which one of the positive electrolyte and the negative electrolyte, in which the quantity of electricity is to be measured, is supplied, and a counter electrode to which the other electrolyte, which is not to be measured, is supplied;
• a standard electrode disposed, outside the electrolytic cell, so as to be in contact with the one electrolyte to be measured;
• and
• a measurement device configured to apply, to the electrolytic cell, a voltage that is set on the basis of a potential of the standard electrode and capable of performing total electrolysis of the one electrolyte contained in the working electrode and measure the quantity of electricity of the one electrolyte.

An electrical quantity measurement method comprising:

• a step of supplying one of a positive electrolyte and a negative electrolyte supplied to a battery cell of a redox flow battery to a working electrode which constitutes an electrolytic cell that is independent from the battery cell, and supplying the other electrolyte to a counter electrode which constitutes the electrolytic cell;
• and
• a step of measuring a quantity of electricity when the one electrolyte contained in the working electrode is discharged by applying a set voltage to the electrolytic cell having the electrolytes supplied thereto,
• wherein the set voltage is a voltage that is based on a potential of a standard electrode disposed, outside the electrolytic cell, so as to be in contact with the one electrolyte and capable of performing total electrolysis of the one electrolyte contained in the working electrode.