Abstract: Cell frame 20 includes: frame body 21 having an opening 22, frame body 21 including through-hole 31 for passage of a fluid containing an active material, through-hole 31 penetrating from one surface of frame body 21 to the other surface thereof around opening 22, and groove-like slit 35 formed in one surface or the other surface and connecting through-hole 31 and opening 22; and rotor 40 made of an insulating material, rotor 40 received in slit 35 and forced to rotate by the flow of the fluid through slit 35 between through-hole 31 and opening 22.

Abstract: Redox flow battery 1 includes cell stack 2, first positive-electrode tank 11, second positive-electrode tank 12, first negative-electrode tank 21, and second negative-electrode tank 22. Cell stack 2 is divided into a plurality of cell groups 3, each of which consists of a plurality of cells 4. The plurality of cell groups 3 are connected to first and second positive-electrode tanks 11, 12 such that a positive-electrode fluid containing positive-electrode active material flows in parallel through the plurality of cell groups 3, and are connected to first and second negative-electrode tanks 21, 22 such that a negative-electrode fluid containing negative-electrode active material flows in parallel through the plurality of cell groups 3. The plurality of cells 4 in each cell group 3 are connected to each other such that the positive-electrode fluid flows in series through a plurality of positive cells 5 and such that the negative-electrode fluid flows in series through a plurality of negative cells 6.

Abstract: Redox flow battery 1 includes cell stack 2, first positive-electrode tank 11, second positive-electrode tank 12, first negative-electrode tank 21, and second negative-electrode tank 22. Cell stack 2 is divided into a plurality of cell groups 3, each of which consists of a plurality of cells 4. The plurality of cell groups 3 are connected to first and second positive-electrode tanks 11, 12 such that a positive-electrode fluid containing positive-electrode active material flows in parallel through the plurality of cell groups 3, and are connected to first and second negative-electrode tanks 21, 22 such that a negative-electrode fluid containing negative-electrode active material flows in parallel through the plurality of cell groups 3. The plurality of cells 4 in each cell group 3 are connected to each other such that the positive-electrode fluid flows in series through a plurality of positive cells 5 and such that the negative-electrode fluid flows in series through a plurality of negative cells 6.