NOVELTY - The redox flow battery (1) comprises a flow reactor (2) having a line (6) for supplying an electrolytic fluid into the flow reactor and a line (8) for discharging the electrolytic fluid from the flow reactor, a first tank connected with the supply line, a second tank connected with the discharge line for receiving the electrolytic fluid, a pump (9) for circulating the electrolytic fluid, a cover disposed at the tanks, and a container closed by a cover. A separating wall is arranged in the container for forming the tanks. An opening is provided in the cover of the container.    USE - Used as a redox flow battery.    ADVANTAGE - The redox flow battery avoids electrolytic fluid loss and prevents a leakage of electrolytic fluid into the environment.    DETAILED DESCRIPTION - The redox flow battery (1) comprises a flow reactor (2) having a line (6) for supplying an electrolytic fluid into the flow reactor and a line (8) for discharging the electrolytic fluid from the flow reactor, a first tank connected with the supply line, a second tank connected with the discharge line for receiving the electrolytic fluid, a pump (9) for circulating the electrolytic fluid, a cover disposed at the tanks, and a container closed by a cover. A separating wall is arranged in the container for forming the tanks. An opening is provided in the cover of the container. An electrolytic fluid-conveying section of the battery is locally disposed above the cover of the container in a partial manner. The supply line, the discharge line, the flow reactor and a further piping of the battery and/or further electrolytic fluid-conveying devices of the battery are locally disposed above the cover of the tanks or the tanks. The cover is slantingly implemented in a funnel-shaped manner. The opening is arranged in the area of the deepest point of the cover. A bulge, in which the pump is disposed, is provided in the tank. A barrier layer is provided in the tank and floats on the surface of the electrolytic fluid. A bulkhead is arranged at one of the tank and partially laterally surrounds the electrolytic fluid-conveying section of the battery.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a redox flow battery.    Redox flow battery (1)    Flow reactor (2)    Supply line (6)    Discharge line (8)    Pump. (9)