For improving the energy efficiency of a cell of a redox flow battery it is desired that the electrolyte liquid flows to the greatest possible extent through the electrode and that there are no flow paths or leakages around the electrode. In order to achieve this, a frame of a cell of a redox flow battery is proposed, said frame having an opening 8 which is bordered by a rim 6, wherein on the rim 6, a first flow blocker 11 is arranged which extends into the opening 8, and a second flow blocker 16 is arranged in the distribution channel 9 in the region of the distribution channel's inflow region for supplying electrolyte liquid into the cell, or in the outflow region for discharging electrolyte liquid, wherein said flow blocker restricts the distribution channel 9 toward the opening 8.