Regeneration of flow battery

A method for regenerating a flow battery, the flow battery including a redox flow cell and a supply/storage system external of the redox flow cell, the supply/storage system including first and second electrolytes for circulation through the redox flow cell, the first electrolyte is a liquid electrolyte having electrochemically active species with multiple, reversible oxidation states, wherein the electrochemically active species can form a solid precipitate blockage in the redox flow cell, the method comprising:

• identifying whether there is a solid precipitate blockage in the redox flow cell;
• in response to identifying that there is a solid precipitate blockage, initiating a regeneration mode that reduces an oxidation state of electrochemically active species in the liquid electrolyte to dissolve, in situ, the solid precipitate blockage.