Redox flow battery

A redox flow battery comprising:

• at least one series circuit in which at least two or more cell stacks each including at least one cell are electrically connected in series, wherein
• the at least one cell is divided into a first chamber and a second chamber by a membrane, a first electrolyte circulates in the first chamber, and a second electrolyte circulates in the second chamber,
• a first circulation passage which includes the first chamber in the passage and through which the first electrolyte circulates and a second circulation passage which includes the second chamber in the passage and through which the second electrolyte circulates are individually provided for each of the at least two or more cell stacks,
• each of the at least two or more cell stacks includes a cell stack input terminal and a cell stack output terminal,
• a bypass circuit that electrically bypasses the cell stack is provided for each of the at least two or more cell stacks,
• each of the bypass circuits includes a bypass circuit input terminal and a bypass circuit output terminal,
• an input switch that switches between the cell stack input terminal and the bypass circuit input terminal and an output switch that switches between the cell stack output terminal and the bypass circuit output terminal are provided for each of the at least two or more cell stacks,
• the at least one series circuit includes at least two or more series circuits in which series circuits are electrically connected in parallel,
• a connection circuit in which the at least two or more series circuits are electrically connected in parallel is provided, and
• a first diode that allows a current to flow to only the series circuit from the connection circuit, a second diode that allows a current to flow to only the connection circuit from the series circuit, and a changeover switch that connects the connection circuit to either the first diode or the second diode are provided between the connection circuit and each of the at least two or more series circuits.