Patent ID: 7517608

Claim:
A redox battery energy storage system comprising: a cell including a positive compartment having positive solution, a negative compartment having negative solution, and a membrane separating the positive and negative compartments; a positive line coupled to the positive compartment to carry positive solution; a positive reservoir coupled to the positive line and having positive solution, the positive reservoir having a positive vent space for positive gas, including oxygen; a negative line coupled to the negative compartment to carry negative solution; a negative reservoir coupled to the negative line and having negative solution, the negative reservoir having a negative vent space for negative gas; an eductor; a kick-back line coupled to the negative line and to the negative reservoir to partially recirculate the negative solution, the eductor coupled to the kick-back line, the negative solution of the kick-back line to act as a motive liquid; and a positive gas draw line in fluid communication with the positive vent space and coupled to the eductor, whereby the eductor entrains positive gas from the positive vent space and mixes it into the negative solution of the kick-back line, thereby absorbing oxygen from the positive gas.