Redox flow battery system and method for operating redox flow battery

1 . A redox flow battery system comprising:

a battery cell that performs charge-discharge by supplying an electrolyte;

a monitor cell to which the electrolyte is supplied;

a voltmeter that measures an open circuit voltage of the monitor cell;

a thermometer that measures a liquid temperature of the electrolyte; and

a controller that controls the charge-discharge of the battery cell based on the open circuit voltage,

wherein the electrolyte comprises an active material ion, and

wherein the controller is configured to correct the open circuit voltage in accordance with the liquid temperature, wherein the controller is configured to correct the open circuit voltage by:

calculating a temperature difference between the liquid temperature and a reference temperature;

calculating a change amount of a reference potential with respect to the open circuit voltage at the reference temperature using a potential temperature coefficient of the active material ion and the temperature difference; and

correcting the open circuit voltage by adding the change amount of the reference potential to the open circuit voltage.

2 . The redox flow battery system according to claim 1 , wherein the controller corrects at least an upper limit value of the open circuit voltage.

3 . The redox flow battery system according to claim 1 , wherein the electrolyte contains a vanadium ion.

4 . A redox flow battery operation method for performing charge-discharge by supplying an electrolyte comprising an active material ion to a battery cell, the method comprising:

measuring an open circuit voltage of a monitor cell to which the electrolyte is supplied;

measuring a liquid temperature of the electrolyte;

correcting the open circuit voltage in accordance with the liquid temperature; and

performing the charge-discharge of the battery cell based on the corrected open circuit voltage,

wherein correcting the open circuit voltage comprises the steps of:

calculating a temperature difference between the liquid temperature and a reference temperature;

calculating a change amount of a reference potential with respect to the open circuit voltage at the reference temperature using a potential temperature coefficient of the active material ion and the temperature difference; and

correcting the open circuit voltage by adding the change amount of the reference potential to the open circuit voltage.

5 . The redox flow battery system according to claim 2 , wherein the electrolyte contains a vanadium ion.