REDOX FLOW BATTERY SYSTEM AND METHOD FOR OPERATING REDOX FLOW BATTERY

摘要

Provided are a redox flow battery system and a method for operating a redox flow battery that suppress overcharge and overdischarge of an electrolyte. A redox flow battery system includes a pump that supplies an electrolyte to a battery cell by circulation, a pump controller that controls a flow rate of the pump, and a measurement unit that measures at least two parameters selected from among an inlet-side state of charge of the electrolyte supplied to the battery cell, an outlet-side state of charge of the electrolyte drained from the battery cell, and a charge/discharge current input to/output from the battery cell. The pump controller includes a pump flow-rate computation unit that calculates a charge/discharge efficiency of the battery cell from the parameters measured by the measurement unit and, based on the charge/discharge efficiency, determines the flow rate of the pump so that the electrolyte drained from the battery cell is neither overcharged nor overdischarged. The pump controller also includes a pump flow-rate instruction unit that sets in the pump the flow rate determined by the pump flow-rate computation unit.