US 11,749,827 B2
Method for iron preformation in redox flow batteries
Yang Song, West Linn, OR (US); Brady Thompson, Canby, OR (US); and Timothy J. McDonald, Portland, OR (US)
Assigned to ESS TECH, INC., Wilsonville, OR (US)
Filed by ESS TECH, INC., Wilsonville, OR (US)
Filed on Oct. 26, 2020, as Appl. No. 17/80,702.
Claims priority of provisional application 62/929,634, filed on Nov. 1, 2019.
Prior Publication US 2021/0135270 A1, May 6, 2021
Int. Cl. H01M 8/18 (2006.01); H01M 8/04537 (2016.01); H01M 8/04858 (2016.01); H01M 4/52 (2010.01)
CPC H01M 8/188 (2013.01) [H01M 4/521 (2013.01); H01M 8/04604 (2013.01); H01M 8/04895 (2013.01)] 8 Claims
 
1. A method for a redox flow battery, the method comprising:
in a first condition, discharging the redox flow battery and then, in response to a battery charge capacity falling below a battery cycling charging threshold, charging the redox flow battery without entering an idle mode of the redox flow battery; and
in a second condition, in response to the battery charge capacity falling below a system conditioning charging threshold, charging the redox flow battery, including preforming an iron plating amount at a negative electrode of the redox flow battery, and thereafter entering the idle mode, including adjusting each of an electrolyte pH and an electrolyte state of charge (SOC) imbalance, wherein the system conditioning charging threshold is lower than the battery cycling charging threshold.