US 12,266,829 B2
Multi-stage rebalancing reactor for redox flow battery system
Yang Song, West Linn, OR (US); Craig E. Evans, West Linn, OR (US); Timothy J. McDonald, Portland, OR (US); Kenneth Fisher, Portland, OR (US); and Sean Kissick, Portland, OR (US)
Assigned to ESS TECH, INC., Wilsonville, OR (US)
Filed by ESS TECH, INC., Wilsonville, OR (US)
Filed on May 25, 2023, as Appl. No. 18/324,044.
Application 18/324,044 is a continuation of application No. 17/081,695, filed on Oct. 27, 2020, granted, now 11,728,497.
Claims priority of provisional application 62/933,000, filed on Nov. 8, 2019.
Prior Publication US 2023/0299318 A1, Sep. 21, 2023
Int. Cl. H01M 8/04 (2016.01); H01M 8/04186 (2016.01); H01M 8/04276 (2016.01); H01M 8/18 (2006.01)
CPC H01M 8/04276 (2013.01) [H01M 8/04186 (2013.01); H01M 8/188 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method for a redox flow battery system, comprising:
flowing an electrolyte from an electrolyte storage tank to a multi-stage rebalancing reactor, the multi-stage rebalancing reactor comprising reactor vessels grouped to form stages, wherein the reactor vessels in a first stage of the stages are fluidly coupled to reactor vessels in a second stage of the stages, the second stage downstream of the first stage;
injecting hydrogen gas into the electrolyte upstream of the multi-stage rebalancing reactor via a gas line configured to siphon hydrogen gas from a head space of the electrolyte storage tank, wherein injecting hydrogen gas into the electrolyte includes injecting the hydrogen gas at each of the first stage and the second stage via a first injector and a second injector arranged upstream of each of the first stage and the second stage; and
chemically reducing a metal ion of the electrolyte by oxidizing the hydrogen gas at a catalyst bed of each of the reactor vessels to maintain a charge balance of the electrolyte and a pH of the electrolyte within a predetermined range.