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Rebalancing electrolytes in redox flow battery systems

United States Patent

December 23, 2014
View the Complete Patent at the US Patent & Trademark Office
Embodiments of redox flow battery rebalancing systems include a system for reacting an unbalanced flow battery electrolyte with a rebalance electrolyte in a first reaction cell. In some embodiments, the rebalance electrolyte may contain ferrous iron (Fe.sup.2+) which may be oxidized to ferric iron (Fe.sup.3+) in the first reaction cell. The reducing ability of the rebalance reactant may be restored in a second rebalance cell that is configured to reduce the ferric iron in the rebalance electrolyte back into ferrous iron through a reaction with metallic iron.
Chang; On Kok (San Jose, CA), Pham; Ai Quoc (Milpitas, CA)
Enervault Corporation (Sunnyvale, CA)
13/ 433,189
March 28, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH Inventions included in this patent application were made with Government support under DE-OE0000225 "Recovery Act--Flow Battery Solution for Smart Grid Renewable Energy Applications" awarded by the US Department of Energy (DOE). The Government has certain rights in these inventions.