Sumitomo Electric Industries, Limited

Hideki Miyawaki

Yongrong Dong

Yoshiyasu Kawagoe

Yasuhiro Naitou

A bipolar plate to be arranged opposite to an electrode that is supplied with an electrolyte solution to cause a battery reaction includes a plurality of groove portions in which the electrolyte solution flows and rib portions that each separate the adjacent groove portions on at least one of its front and back surfaces. A specific rib portion including a contact surface to be brought into contact with the electrode and one or more recessed portions that are open in the contact surface is included among the rib portions.

Bipolar plate, cell frame, battery cell, cell stack, and redox flow battery

A redox flow battery includes a battery cell to which a positive electrolyte and a negative electrolyte are supplied, and an electrical quantity measurement system configured to measure a quantity of electricity when a predetermined amount of electrolyte is discharged, for at least one of the positive electrolyte and the negative electrolyte. The electrical quantity measurement system includes 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.

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

Provided is a method of operating an RF battery in which charging and discharging are performed by circulating and supplying a positive electrode electrolyte in a positive electrode tank to a positive electrode and circulating and supplying a negative electrode electrolyte in a negative electrode tank to a negative electrode. The positive electrode electrolyte contains manganese ions and added metal ions. The negative electrode electrolyte contains at least one species of metal ions selected from the group consisting of titanium ions, vanadium ions, and chromium ions. The added metal ions are at least one selected from the group consisting of cadmium ions, tin ions, antimony ions, lead ions, and bismuth ions. The method of operating an RF battery includes a dissolution step in which, when metal precipitates, formed by reduction of the added metal ions which have moved from the positive electrode electrolyte to a circulating pathway of the negative electrode electrolyte, are contained in the circulating pathway of the negative electrode electrolyte, the metal precipitates are dissolved and ionized in the positive electrode electrolyte.

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Osaka, Japan

Hideki Miyawaki