US 11,949,134 B2
Redox flow battery arrays and methods for state of charge balancing
Andrew Klassen, Vancouver (CA); David Genders, Vancouver (CA); and Matthew Harper, Vancouver (CA)
Assigned to Invinity Energy Systems (Canada) Corporation, Vancouver (CA)
Appl. No. 17/631,983
Filed by INVINITY ENERGY SYSTEMS (CANADA) CORPORATION, Vancouver (CA)
PCT Filed Jul. 29, 2020, PCT No. PCT/US2020/044075
§ 371(c)(1), (2) Date Feb. 1, 2022,
PCT Pub. No. WO2021/025925, PCT Pub. Date Feb. 11, 2021.
Claims priority of provisional application 62/882,071, filed on Aug. 2, 2019.
Prior Publication US 2022/0285709 A1, Sep. 8, 2022
Int. Cl. H01M 8/04746 (2016.01); H01M 8/04082 (2016.01); H01M 8/04186 (2016.01); H01M 8/04537 (2016.01); H01M 8/18 (2006.01); H01M 8/2455 (2016.01)
CPC H01M 8/04753 (2013.01) [H01M 8/04186 (2013.01); H01M 8/04201 (2013.01); H01M 8/04559 (2013.01); H01M 8/04589 (2013.01); H01M 8/04619 (2013.01); H01M 8/188 (2013.01); H01M 8/2455 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A redox flow battery array comprising:
at least two flow battery unit strings electrically connected in parallel wherein each flow battery unit string comprises at least one flow battery unit comprising:
a flow battery string comprising at least one flow battery cell wherein each cell comprises an anode and a cathode, and is configured to receive flow battery unit electrolytes comprising an anolyte and a catholyte;
an anolyte tank and a catholyte tank for storage of the anolyte and the catholyte of the flow battery unit electrolytes respectively;
an anolyte circuit comprising a supply line and a return line connecting the anolyte tank to the anodes in flow battery cells in the flow battery string;
a catholyte circuit comprising a supply line and a return line connecting the catholyte tank to cathodes in the flow battery cells in the flow battery string; and
a state-of-charge measuring device capable of measuring the state of charge of the flow battery unit electrolytes in the flow battery unit;
a flow regulator in at least one of the anolyte and the catholyte circuits for regulating flow of at least one of the anolyte and the catholyte therethrough in at least one of the flow battery units in the at least two flow battery unit strings;
a controllable bi-directional power converter electrically connected to each of the at least two flow battery unit strings; and
a controller with inputs connected to each of the state-of-charge measuring devices in the flow battery units and with an output connected to the flow regulator wherein the output of the controller controls the flow regulator so as to regulate the flow of at least one of the anolyte and the catholyte to the anodes and the cathodes in the flow battery cells in the flow battery string in accordance with the states of charge of the flow battery unit electrolytes in the flow battery units and thereby balance the state-of charge in the at least two flow battery unit strings.