公开(公告)号：US20250006966A1

公开(公告)日：2025-01-02

申请号：US18829070

申请日：2024-09-09

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M4/90 ,  H01M8/06

Abstract: A hybrid redox fuel cell system includes a hybrid redox fuel cell and an electrochemical cell. The hybrid redox fuel cell includes an anode side through which hydrogen is flowed and a cathode side through which liquid electrolyte is flowed, the liquid electrolyte including a metal ion at a higher oxidation state and the metal ion at a lower oxidation state. An anode side of the electrochemical cell is fluidly connected to the cathode side of the hybrid redox fuel cell. At the hybrid redox fuel cell, power is generated by reducing the metal ion at the higher oxidation state to the lower oxidation state at the cathode side while oxidizing the reductant at the anode side. At the anode side of the electrochemical cell, the metal ion at the lower oxidation state is oxidized to the higher oxidation state while the power is generated.

公开(公告)号：US20240421335A1

公开(公告)日：2024-12-19

申请号：US18821833

申请日：2024-08-30

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Kenneth Kiyoshi Fisher ,  Timothy McDonald

IPC: H01M8/18 ,  H01M8/0202 ,  H01M8/0289 ,  H01M8/04007 ,  H01M8/04082 ,  H01M8/04089 ,  H01M8/2455 ,  H01M8/2484

Abstract: A multi-chambered electrolyte storage tank for a redox flow battery system, may include first and second electrolyte chambers, and a bulkhead, wherein the first and second electrolyte chambers are fluidly coupled to first and second sides of a redox flow battery cell, respectively, the first and second electrolyte chambers include first and second liquid electrolyte volumes, respectively, and the first and second liquid electrolyte volumes are separated by the bulkhead positioned therebetween. In this way, manufacturing and operational complexity of a redox flow battery system can be reduced.

公开(公告)号：US12087981B2

公开(公告)日：2024-09-10

申请号：US18361626

申请日：2023-07-28

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Timothy J. McDonald ,  Alexandria Behr

IPC: H01M8/06 ,  H01M8/04186 ,  H01M8/0444 ,  H01M8/04746 ,  H01M8/18

CPC classification number: H01M8/0693 ,  H01M8/04186 ,  H01M8/0444 ,  H01M8/04753 ,  H01M8/188

Abstract: Methods and systems are provided for a rebalancing reactor of a flow battery system. In one example, a pH of a battery electrolyte may be maintained by the rebalancing reactor by applying a negative potential to a catalyst bed of the rebalancing reactor. A performance of the rebalancing reactor may further be maintained by treating the catalyst bed with deionized water.

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：US20240234760A9

公开(公告)日：2024-07-11

申请号：US18465841

申请日：2023-09-12

Applicant: ESS TECH, INC.

Inventor： Joseph Michael Cooley ,  Yang Song

IPC: H01M8/04276 ,  F16K11/00 ,  H01M8/0289 ,  H01M8/043 ,  H01M8/04746 ,  H01M8/18

CPC classification number: H01M8/04276 ,  F16K11/00 ,  H01M8/0289 ,  H01M8/043 ,  H01M8/04746 ,  H01M8/188

Abstract: Systems and methods are provided for a redox flow battery system. In one example, the redox flow battery system includes an electrolyte sump tank positioned below cell stacks of the redox flow battery system. The electrolyte sump tank may be configured to receive electrolyte from the cell stacks during operation of the redox flow battery system in a stand-by mode. The redox flow battery system may further include three-way valves arranged in a flow path of the electrolyte between the cell stacks and the electrolyte sump tank to control a flow of the electrolyte to the electrolyte sump tank.

公开(公告)号：US20240136551A1

公开(公告)日：2024-04-25

申请号：US18465841

申请日：2023-09-11

Applicant: ESS TECH, INC.

Inventor： Joseph Michael Cooley ,  Yang Song

IPC: H01M8/04276 ,  F16K11/00 ,  H01M8/0289 ,  H01M8/043 ,  H01M8/04746 ,  H01M8/18

CPC classification number: H01M8/04276 ,  F16K11/00 ,  H01M8/0289 ,  H01M8/043 ,  H01M8/04746 ,  H01M8/188

Abstract: Systems and methods are provided for a redox flow battery system. In one example, the redox flow battery system includes an electrolyte sump tank positioned below cell stacks of the redox flow battery system. The electrolyte sump tank may be configured to receive electrolyte from the cell stacks during operation of the redox flow battery system in a stand-by mode. The redox flow battery system may further include three-way valves arranged in a flow path of the electrolyte between the cell stacks and the electrolyte sump tank to control a flow of the electrolyte to the electrolyte sump tank.

公开(公告)号：US20230378505A1

公开(公告)日：2023-11-23

申请号：US18361626

申请日：2023-07-28

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Timothy J. McDonald ,  Alexandria Behr

IPC: H01M8/06 ,  H01M8/18 ,  H01M8/0444 ,  H01M8/04746 ,  H01M8/04186

CPC classification number: H01M8/0693 ,  H01M8/188 ,  H01M8/0444 ,  H01M8/04753 ,  H01M8/04186

Abstract: Methods and systems are provided for a rebalancing reactor of a flow battery system. In one example, a pH of a battery electrolyte may be maintained by the rebalancing reactor by applying a negative potential to a catalyst bed of the rebalancing reactor. A performance of the rebalancing reactor may further be maintained by treating the catalyst bed with deionized water.

公开(公告)号：US20230378482A1

公开(公告)日：2023-11-23

申请号：US18363576

申请日：2023-08-01

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Yan Wu ,  Brady Thompson

IPC: H01M8/0247 ,  H01M8/0228 ,  H01M8/18

CPC classification number: H01M8/0247 ,  H01M8/0228 ,  H01M8/188

Abstract: Systems and methods are provided for electrochemical and/or chemical pretreatment of bipolar plates, for example, for plating electrodes in redox flow batteries. In one example, a method may include pretreating a bipolar plate for the redox flow battery by disrupting a surface of the bipolar plate. In some examples, pretreating the bipolar plate may include positioning the bipolar plate within the redox flow battery, and thereafter charging the redox flow battery at multiple discrete plating current densities for each of one or more initial charging cycles to electrochemically etch the surface. In additional or alternative examples, pretreating the bipolar plate may include soaking the bipolar plate in solution to chemically treat the surface. In this way, the bipolar plate may be pretreated via electrochemical etching and/or chemical treatment so as to reduce electrochemical performance losses and dendrite formation in the redox flow battery.

公开(公告)号：US20230253583A1

公开(公告)日：2023-08-10

申请号：US18301927

申请日：2023-04-17

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Timothy J. McDonald ,  Kenneth Fisher

IPC: H01M8/04276 ,  H01M8/04298 ,  H01M8/18 ,  H01M8/04119

CPC classification number: H01M8/04283 ,  H01M8/04298 ,  H01M8/188 ,  H01M8/04119

Abstract: Methods and systems are provided for a redox flow battery system. In one example, a method of operating a redox flow battery system includes, responsive to switching the redox flow battery system to an idle mode, initiating a first timer monitoring a first threshold period of time. An electrolyte pump may be activated when the first threshold period of time elapses, the electrolyte pump driving circulation of electrolytes through one or more electrode compartments.

公开(公告)号：US20230246218A1

公开(公告)日：2023-08-03

申请号：US18162596

申请日：2023-01-31

Applicant: ESS TECH, INC.

Inventor： Neal Walters Kuperman ,  Yang Song

IPC: H01M8/18 ,  H01M10/44

CPC classification number: H01M8/188 ,  H01M10/44 ,  H01M2004/029

Abstract: Systems and methods are provided for a redox flow battery. In one example, a method for the redox flow battery includes operating the redox flow battery in a short-term idle mode by discharging a current density as a pulse of a duration shorter than a duration of the short term idle mode. By discharging the current density, a plating surface at a negative electrode of the redox flow battery system may be maintained.