公开(公告)号：US20210143455A1

公开(公告)日：2021-05-13

申请号：US17081695

申请日：2020-10-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Timothy J. McDonald ,  Kenneth Fisher ,  Sean Kissick

IPC: H01M8/04276 ,  H01M8/04186 ,  H01M8/18

Abstract: A rebalancing reactor for a redox flow battery system may include a plurality of reactor vessels arranged in stages, each vessel of the plurality of reactor vessels housing a catalyst bed. In one example, the rebalancing reactor is fluidly coupled to an electrolyte storage tank and configured to flow electrolyte through the plurality of reactor vessels, enabling a chemical rebalancing of electrolyte in the redox flow battery cell.

公开(公告)号：US20240194921A1

公开(公告)日：2024-06-13

申请号：US18065576

申请日：2022-12-13

Applicant: ESS TECH, INC.

Inventor： Sean Kissick ,  Yang Song ,  Timothy J McDonald

IPC: H01M8/18 ,  H01M8/04089 ,  H01M8/04537 ,  H01M8/04746

CPC classification number: H01M8/188 ,  H01M8/04089 ,  H01M8/04611 ,  H01M8/04753

Abstract: Systems and methods are provided for rebalancing cells in a redox flow battery. In one example, a method of operating a rebalancing cell in a redox flow battery system includes measuring a state-of-charge (SOC) of a redox flow battery in the redox flow battery system, calculating an electrolyte concentration from the measured SOC of the redox flow battery, and maintaining a rebalancing reaction rate at the rebalancing cell. In one example, maintaining the rebalancing includes, responsive to a change in the electrolyte concentration, adjusting an electrolyte flow rate to the rebalancing cell and adjusting a hydrogen flow rate to the rebalancing cell.

公开(公告)号：US20230299318A1

公开(公告)日：2023-09-21

申请号：US18324044

申请日：2023-05-25

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Timothy J. McDonald ,  Kenneth Fisher ,  Sean Kissick

IPC: H01M8/04276 ,  H01M8/18 ,  H01M8/04186

CPC classification number: H01M8/04276 ,  H01M8/188 ,  H01M8/04186

Abstract: A method for a redox flow battery system may include 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. Hydrogen gas may be injected into the electrolyte upstream of the multi-stage rebalancing reactor via a gas line and a metal ion of the electrolyte may be chemically reduced 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.

公开(公告)号：US20240063416A1

公开(公告)日：2024-02-22

申请号：US17821400

申请日：2022-08-22

Applicant: ESS Tech, Inc.

Inventor： Sean Kissick ,  Yang Song ,  Timothy J. McDonald

IPC: H01M8/18 ,  H01M8/22

CPC classification number: H01M8/188 ,  H01M8/225

Abstract: Systems and methods are provided for rebalancing cells in a redox flow battery. In one example, a rebalancing cell system includes a first rebalancing cell in series fluidic communication with a second rebalancing cell and a hydrogen source, the first rebalancing cell includes a first electrode assembly stack with hydrogen flow paths extending therethrough and having a higher pressure than an electrolyte in the first electrode assembly stack. Further, the second rebalancing cell includes a second electrode assembly stack with hydrogen flow paths that extend therethrough and have a higher pressure than an electrolyte in the second electrode assembly stack.

公开(公告)号：US20240055643A1

公开(公告)日：2024-02-15

申请号：US18358877

申请日：2023-07-25

Applicant: ESS TECH, INC.

Inventor： Sean Kissick ,  Timothy J. McDonald ,  Yang Song

IPC: H01M8/18 ,  H01M8/04276 ,  H01M8/0438 ,  H01M8/04746 ,  F17C5/06

CPC classification number: H01M8/188 ,  H01M8/04276 ,  H01M8/04425 ,  H01M8/04776 ,  F17C5/06 ,  F17C2201/018 ,  F17C2205/0134 ,  F17C2223/031 ,  F17C2225/033 ,  F17C2205/0332 ,  F17C2250/043 ,  F17C2221/012 ,  F17C2250/0647 ,  F17C2250/03

Abstract: Systems and methods are provided for managing health of electrolytes of redox flow battery system. Components of the system may include a redox rebalancing cells and a gas storage system. The redox rebalancing cell may be operated by plating iron on a plating electrode, treating a negative electrolyte of the redox flow battery system with the plated iron and returning the negative electrolyte to an electrolyte tank. The gas storage system may include a set of expandable gas storage tanks coupled to at least one electrolyte storage tank and an electrolyte rebalancing system of the redox flow battery system.

公开(公告)号：US12266829B2

公开(公告)日：2025-04-01

申请号：US18324044

申请日：2023-05-25

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Timothy J. McDonald ,  Kenneth Fisher ,  Sean Kissick

IPC: H01M8/04 ,  H01M8/04186 ,  H01M8/04276 ,  H01M8/18

Abstract: A method for a redox flow battery system may include 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. Hydrogen gas may be injected into the electrolyte upstream of the multi-stage rebalancing reactor via a gas line and a metal ion of the electrolyte may be chemically reduced 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.

公开(公告)号：US20240243328A1

公开(公告)日：2024-07-18

申请号：US18409691

申请日：2024-01-10

Applicant: ESS TECH, INC.

Inventor： Joseph Brindle ,  Sean Kissick ,  Timothy J McDonald ,  Yang Song

IPC: H01M8/18 ,  H01M16/00

CPC classification number: H01M8/188 ,  H01M16/006

Abstract: Systems and methods are provided for maintaining electrolyte health of a redox flow battery system. The redox flow battery system comprising a redox flow battery cell having a positive electrode compartment and a negative electrolyte compartment, an electrolyte storage tank storing positive and negative electrolyte, the positive and negative electrolyte circulated between the electrolyte storage tank and respective positive and negative electrode compartments. The redox flow battery system further comprises a rebalancing battery including a positive electrode arranged in a flow path of the positive electrolyte and a negative electrode arranged in a flow path of the negative electrolyte.

公开(公告)号：US20240055642A1

公开(公告)日：2024-02-15

申请号：US18358874

申请日：2023-07-25

Applicant: ESS TECH, INC.

Inventor： Sean Kissick ,  Timothy J. McDonald ,  Yang Song

IPC: H01M8/18 ,  H01M8/04276 ,  H01M4/96 ,  H01M8/04746 ,  H01M8/04858

CPC classification number: H01M8/188 ,  H01M8/04276 ,  H01M4/96 ,  H01M8/04746 ,  H01M8/04865

Abstract: Systems and methods are provided for managing health of electrolytes of redox flow battery system. Components of the system may include a redox rebalancing cells and a gas storage system. The redox rebalancing cell may be operated by plating iron on a plating electrode, treating a negative electrolyte of the redox flow battery system with the plated iron and returning the negative electrolyte to an electrolyte tank. The gas storage system may include a set of expandable gas storage tanks coupled to at least one electrolyte storage tank and an electrolyte rebalancing system of the redox flow battery system.

公开(公告)号：US11728497B2

公开(公告)日：2023-08-15

申请号：US17081695

申请日：2020-10-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Timothy J. McDonald ,  Kenneth Fisher ,  Sean Kissick

IPC: H01M8/04 ,  H01M8/04276 ,  H01M8/18 ,  H01M8/04186

CPC classification number: H01M8/04276 ,  H01M8/04186 ,  H01M8/188

Abstract: A rebalancing reactor for a redox flow battery system may include a plurality of reactor vessels arranged in stages, each vessel of the plurality of reactor vessels housing a catalyst bed. In one example, the rebalancing reactor is fluidly coupled to an electrolyte storage tank and configured to flow electrolyte through the plurality of reactor vessels, enabling a chemical rebalancing of electrolyte in the redox flow battery cell.

公开(公告)号：US20230246219A1

公开(公告)日：2023-08-03

申请号：US18163832

申请日：2023-02-02

Applicant: ESS TECH, INC.

Inventor： Sean Kissick ,  Yang Song

IPC: H01M8/18 ,  H01M8/04186 ,  H01M8/04082 ,  H01M8/04276 ,  H01M16/00 ,  H01M8/0656

CPC classification number: H01M8/188 ,  H01M8/04186 ,  H01M8/04201 ,  H01M8/04276 ,  H01M16/006 ,  H01M8/0656

Abstract: Systems and methods are provided for a redox flow battery system. In one example, the redox flow battery system includes one or more redox flow battery cells, a rebalancing cell receiving electrolyte from the one or more redox flow battery cells and catalyzing hydrogen reduction of metal cations in the electrolyte, and a conductive coupler connecting the rebalancing cell to an external voltage source. The conductive coupler enables application of an ion-repelling potential to a stack of electrode assemblies of the rebalancing cell during operation of the redox flow battery system.