US 11,677,093 B2
Electrode assembly for a redox flow battery
Sean Casey, Portland, OR (US); Craig Evans, West Linn, OR (US); Thiago Groberg, Tigard, OR (US); and Yang Song, West Linn, OR (US)
Assigned to ESS Tech, Inc., Wilsonville, OR (US)
Filed by ESS Tech, Inc., Wilsonville, OR (US)
Filed on May 5, 2021, as Appl. No. 17/308,913.
Claims priority of provisional application 63/025,227, filed on May 15, 2020.
Prior Publication US 2021/0359332 A1, Nov. 18, 2021
Int. Cl. H01M 8/248 (2016.01); H01M 8/0247 (2016.01); H01M 8/18 (2006.01)
CPC H01M 8/248 (2013.01) [H01M 8/0247 (2013.01); H01M 8/188 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A redox flow battery, comprising:
a cell stack compressed between terminal structures defining ends of the redox flow battery, the cell stack formed of a plurality of cells, and wherein each cell of the plurality of cells includes:
a deformable positive electrode having a permeability based on a mechanical compression of the positive electrode and in face-sharing contact with a first face of a membrane separator;
a negative electrode configured to be less compressible than the positive electrode and arranged at a second face of the membrane separator opposite from the positive electrode; and
an electrolyte in contact with the positive electrode, the positive electrode having a first set of zones with a first permeability and a second set of zones with a second, lower permeability.