Abstract: The disclosure discloses a redox flow battery stack and a redox flow battery system having the same, wherein the redox flow battery stack includes: flow frames, flow plates arranged inside the flow frame, ion exchange membranes arranged between the flow plates and forming a cavity for accommodating electrolyte with the flow plate, and electrodes arranged inside the cavity, wherein two groups of flow ports are provided on the sides of the flow frame, each group of flow ports includes: a liquid inlet and a liquid outlet, and the liquid inlet and the liquid outlet in each group of flow ports are provided in the manner of one-to-one correspondence and are interconnected with a corresponding cavity; the redox flow battery stack further includes: electrolyte pipelines, the liquid inlet and the liquid outlet in each group of flow ports respectively have a corresponding electrolyte pipeline and interconnect with the corresponding electrolyte pipeline.

Abstract: The disclosure discloses a liquid flow battery system and a repairing device thereof. The repairing device, used for cleaning a battery stack of the liquid flow battery system, comprises an acid liquid storage tank (11), configured to store an acid solution; a first acid liquid pipe (12) connected with a first end of the acid liquid storage tank (11), configured to be connected with a first end of the battery stack; a second acid liquid pipe (13) connected with a second end of the acid liquid storage tank (11), configured to be connected with a second end of the battery stack; and a power device (14) arranged in the first acid liquid pipe (12) or the second acid liquid pipe (13) and configured to drive the acid solution in the acid liquid storage tank (11) to flow circularly in the first acid liquid pipe (12) and the second acid liquid pipe (13).