公开(公告)号：US11502321B2

公开(公告)日：2022-11-15

申请号：US17308843

申请日：2021-05-05

Applicant: ESS Tech, Inc.

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

IPC: H01M8/18 ,  H01M8/0438

Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a set of pressure plates having a first pressure plate at a first terminal end and a second pressure plate at a second terminal end, the second terminal end and the first terminal end positioned on opposing longitudinal sides of the redox flow battery. The redox flow battery further includes a first cell stack positioned longitudinally between the first pressure plate and the second pressure plate, each of the first and second pressure plates includes a plurality stacking detents on a first flange and a plurality of stacking protrusions on a second flange, and the first flange and the second flange arranged on opposing vertical sides of the redox flow battery.

公开(公告)号：US12087984B2

公开(公告)日：2024-09-10

申请号：US17929627

申请日：2022-09-02

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/00 ,  H01M4/90 ,  H01M8/06 ,  H01M8/18

CPC classification number: H01M8/188 ,  H01M4/9016 ,  H01M8/0693

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：US20240282995A1

公开(公告)日：2024-08-22

申请号：US18641100

申请日：2024-04-19

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M8/04186

CPC classification number: H01M8/188 ,  H01M8/04194

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 catalyst bed fluidly connected to the cathode side of the hybrid redox fuel cell, the catalyst bed including a substrate layer and a catalyst layer spiral wound into a jelly roll structure. 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 from 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：US20230089941A1

公开(公告)日：2023-03-23

申请号：US17929623

申请日：2022-09-02

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M8/22 ,  H01M8/06

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：US20230061531A1

公开(公告)日：2023-03-02

申请号：US17816256

申请日：2022-07-29

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M8/04082

Abstract: Systems and methods are provided for electrolyte and current circulation in a redox flow battery system. In one example, the redox flow battery system may include a plurality of redox flow battery cells electrically coupled in series. In this way, a potential difference across the plurality of redox flow battery cells may be ramped up, such that relatively high voltage external loads may be powered by the redox flow battery system. In some examples, each of the plurality of redox flow battery cells may be fluidically isolated from one another. As such, in one example, the redox flow battery system may further include a plurality of electrolyte storage tanks respectively fluidically coupled to the plurality of redox flow battery cells. Such fluidic isolation of each of the plurality of redox flow battery cells may eliminate stack-to-stack shunting in the redox flow battery system, as well as improve a modularity thereof.

公开(公告)号：US20230016796A1

公开(公告)日：2023-01-19

申请号：US17932245

申请日：2022-09-14

Applicant: ESS TECH, INC.

Inventor： Craig Evans ,  Sean Kissick ,  Yang Song

IPC: H01M8/18 ,  H01M8/0297

Abstract: Systems and methods are provided for a rebalancing cell for a redox flow battery. In one example, a rebalancing cell for a redox flow battery includes a cell enclosure and a stack of electrode assemblies enclosed by the cell enclosure, where each electrode assembly of the stack of electrode assemblies including a positive electrode interfacing with a flow field plate. A face of the flow field plate interfacing with the positive electrode has a plurality of passages including tapered inlets and outlets and partial channels configured to remove gas from electrolyte flowing therethrough.

公开(公告)号：US20220399561A1

公开(公告)日：2022-12-15

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：US20210359326A1

公开(公告)日：2021-11-18

申请号：US17308843

申请日：2021-05-05

Applicant: ESS Tech, Inc.

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

IPC: H01M8/18 ,  H01M8/0438

Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a set of pressure plates having a first pressure plate at a first terminal end and a second pressure plate at a second terminal end, the second terminal end and the first terminal end positioned on opposing longitudinal sides of the redox flow battery. The redox flow battery further includes a first cell stack positioned longitudinally between the first pressure plate and the second pressure plate, each of the first and second pressure plates includes a plurality stacking detents on a first flange and a plurality of stacking protrusions on a second flange, and the first flange and the second flange arranged on opposing vertical sides of the redox flow battery.

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.