Methods and systems for operating a redox flow battery system
AssigneeEss Tech, Inc.
InventorsYang Song, Evan Doremus, Thiago Groberg
Life of this patent
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Abstract
A method of operating a redox flow battery, may include maintaining a positive electrode compartment pressure greater than a negative electrode compartment pressure, and maintaining a cross-over pressure less than a membrane break-through pressure, wherein the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure. In this way, ionic resistance across the separator can be maintained at a lower level by reducing gas bubbles trapped therein while reducing separator break-through, thereby increasing performance of the redox flow battery system.
Claims19
A method of operating a redox flow battery, comprising:
- in response to an increase in an electrical resistance of the redox flow battery being greater than a threshold increase in electrical resistance, increasing a cross-over pressure by performing one or more of,
- increasing a positive electrode compartment pressure of the redox flow battery, and
- reducing a negative electrode compartment pressure of the redox flow battery, wherein
- the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure.
A redox flow battery system, comprising:
- negative and positive electrode compartments electrically separated by an ionically-permeable separator;
- wherein the ionically-permeable separator comprises a hybrid membrane, the hybrid membrane comprising a microporous membrane layer facing the negative electrode compartment and an ion-exchange membrane layer facing the positive electrode compartment;
- negative and positive electrolyte pumps supplying negative and positive electrolyte to the negative and positive electrode compartments, respectively;
- and a controller, including executable instructions residing in memory on-board the controller to:
- in response to charging the redox flow battery system, increasing a cross-over pressure by performing one or more of,
- increasing a positive electrode compartment pressure, and
- reducing a negative electrode compartment pressure, wherein
- the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure.
A method of operating a redox flow battery, including:
- maintaining a positive electrode compartment pressure greater than a negative electrode compartment pressure, and
- maintaining a cross-over pressure less than a membrane break-through pressure, wherein the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure;
- and
- in response to an increase in an electrical resistance of the redox flow battery being less than a threshold increase, reducing the cross-over pressure while maintaining the cross-over pressure greater than a lower threshold cross-over pressure.
Dependencies are inferred from the claim text.