公开(公告)号：US09614244B2

公开(公告)日：2017-04-04

申请号：US14019488

申请日：2013-09-05

Applicant: ESS TECH, INC.

Inventor： Craig Evans ,  Yang Song

IPC: H01M8/20 ,  H01M8/0258 ,  H01M8/0247 ,  H01M8/18

CPC classification number: H01M8/188 ,  H01M8/20 ,  Y02E60/528

Abstract: A system for a flow cell for a hybrid flow battery, comprising: a redox plate comprising a plurality of electrolyte flow channels; conductive inserts attached to the redox plate between adjacent electrolyte flow channels; a redox electrode attached to a surface of the redox plate; a plating electrode, comprising: a plurality of folded fins with an oscillating cross-section, the plurality of folded fins comprising: a first planar surface; a second planar surface, parallel to the first planar surface; a plurality of ridges intersecting the first and second planar surfaces such that the plurality of ridges divide the first planar surface into a first plurality of strips, and divide the second planar surface into a second plurality of strips; and a membrane barrier. In this way, the capacity and performance of hybrid flow batteries may be maximized, through decreasing the reaction kinetics, mass transport and ohmic resistance losses at both electrodes.

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：US12255370B2

公开(公告)日：2025-03-18

申请号：US18296170

申请日：2023-04-05

Applicant: ESS TECH, INC.

Inventor： Sean Casey ,  Craig Evans ,  Thiago Groberg ,  Yang Song

IPC: H01M8/248 ,  H01M8/0247 ,  H01M8/18

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system includes a cell stack compressed between terminal structures defining ends of the redox flow battery. The cell stack may be formed of a plurality of cells where each cell includes a deformable positive electrode in contact with a first face of a membrane separator and a negative electrode configured to be less compressible than the positive electrode and arranged at a second face of the membrane separator.

公开(公告)号：US12191548B2

公开(公告)日：2025-01-07

申请号：US17929623

申请日：2022-09-02

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M8/06 ,  H01M8/22

Abstract: A hybrid redox fuel cell system includes a hybrid redox fuel cell including an anode side through which a reductant is flowed and a cathode side through which liquid electrolyte is flowed, and a trickle bed reactor including a catalyst bed fluidly connected to the cathode side of the hybrid redox fuel cell. Furthermore, the liquid electrolyte includes a metal ion at a higher oxidation state and the metal ion at a lower oxidation state, and power is generated at the hybrid redox fuel cell by way of 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.

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：US12160025B2

公开(公告)日：2024-12-03

申请号：US17821759

申请日：2022-08-23

Applicant: ESS TECH, INC.

Inventor： Sean Casey ,  Craig Evans

IPC: H01M8/248 ,  H01M8/18

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system has a first redox flow battery and a second redox flow battery, stacked above and in contact with the first redox flow battery along a vertical axis of the redox flow battery system. The second redox flow battery may be coupled to the first redox flow battery via nesting detents. Furthermore, operation of the first redox flow battery and the second redox flow battery may be adjustable according to a power demand.

公开(公告)号：US20240396064A1

公开(公告)日：2024-11-28

申请号：US18674401

申请日：2024-05-24

Applicant: ESS TECH, INC.

Inventor： Craig Evans

IPC: H01M8/04276 ,  H01M8/04082 ,  H01M8/0444 ,  H01M8/04537 ,  H01M8/04746 ,  H01M8/18

Abstract: Systems and methods are provided for a redox flow battery system. In one example, the redox flow battery system includes an electrolyte storage tank having a first chamber and a second chamber, and a mixing valve fluidically coupling the first chamber to the second chamber. The mixing valve may be selectively opened according to predetermined duty cycles to allow exchange of electrolyte between the first chamber and the second chamber.

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：US20240266555A1

公开(公告)日：2024-08-08

申请号：US18412269

申请日：2024-01-12

Applicant: ESS TECH, INC.

Inventor： Sean Casey

IPC: H01M8/0221 ,  H01M4/86 ,  H01M4/88 ,  H01M4/90 ,  H01M4/96 ,  H01M8/0252 ,  H01M8/0258 ,  H01M8/18

CPC classification number: H01M8/0221 ,  H01M4/8652 ,  H01M4/88 ,  H01M4/9041 ,  H01M4/96 ,  H01M8/0252 ,  H01M8/0258 ,  H01M2004/8694 ,  H01M8/188

Abstract: Systems and methods are provided for an electrode assembly. In one example, the electrode assembly includes a bipolar plate and a negative electrode spacer fixedly coupled to a surface of the bipolar plate. The negative electrode spacer may comprise an array of discrete structures protruding from the surface of the bipolar plate.