Patent ID: 8906529

Claim:
An electrical power system, comprising: a source of electrical power; and a redox flow battery system coupled to the source of electrical power, and configured to receive electrical power from the source of electrical power and provide electrical power to an electrical load, the redox flow battery system comprising: a first tank for storing a catholyte reactant; a second tank for storing an anolyte reactant; and a first redox flow battery stack assembly coupled to the first tank and the second tank, the first redox battery stack assembly comprising: a first plurality of cells arranged along a first reactant flow path, the first reactant flow path having a first end and a second end, wherein an outlet of a first one of the first plurality of cells is coupled to an inlet of a second one of the first plurality of cells, the first one of the first plurality of cells having a first at least one of: a structural configuration and a material configuration, according to a first position along the first reactant flow path, the second one of the first plurality of cells having a second at least one of: a structural configuration and a material configuration, according to a second position of the second one of the first plurality of cells along the first reactant flow path, wherein the first at least one and the second at least one of: the structural configuration and the material configuration are different based on the first position and the second position along the reactant flow path so as to improve a total energy efficiency of the redox flow battery system.