公开(公告)号：US12132241B2

公开(公告)日：2024-10-29

申请号：US18505880

申请日：2023-11-09

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/00 ,  H01M8/06 ,  H01M8/20

CPC classification number: H01M8/188 ,  H01M8/004 ,  H01M8/0693 ,  H01M8/20 ,  Y02E60/50

Abstract: A method of rebalancing electrolytes in a redox flow battery system comprises directing hydrogen gas generated on the negative side of the redox flow battery system to a catalyst surface, and fluidly contacting the hydrogen gas with an electrolyte comprising a metal ion at the catalyst surface, wherein the metal ion is chemically reduced by the hydrogen gas at the catalyst surface, and a state of charge of the electrolyte and pH of the electrolyte remain substantially balanced.

公开(公告)号：US20240079625A1

公开(公告)日：2024-03-07

申请号：US18505880

申请日：2023-11-09

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/00 ,  H01M8/06 ,  H01M8/20

CPC classification number: H01M8/188 ,  H01M8/004 ,  H01M8/0693 ,  H01M8/20 ,  Y02E60/50

Abstract: A method of rebalancing electrolytes in a redox flow battery system comprises directing hydrogen gas generated on the negative side of the redox flow battery system to a catalyst surface, and fluidly contacting the hydrogen gas with an electrolyte comprising a metal ion at the catalyst surface, wherein the metal ion is chemically reduced by the hydrogen gas at the catalyst surface, and a state of charge of the electrolyte and pH of the electrolyte remain substantially balanced.

公开(公告)号：US11855312B2

公开(公告)日：2023-12-26

申请号：US17653620

申请日：2022-03-04

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Sean Casey ,  Yang Song

IPC: H01M8/0258 ,  H01M8/18 ,  H01M8/0239 ,  H01M4/88 ,  H01M8/20 ,  H01M8/0245

CPC classification number: H01M8/0258 ,  H01M4/8803 ,  H01M4/8817 ,  H01M4/8828 ,  H01M8/0239 ,  H01M8/0245 ,  H01M8/188 ,  H01M8/20 ,  Y02E60/50

Abstract: A redox flow battery may include: a membrane interposed between a first electrode positioned at a first side of the membrane and a second electrode positioned at a second side of the membrane opposite to the first side; a first flow field plate comprising a plurality of positive flow field ribs, each of the plurality of positive flow field ribs contacting the first electrode at first supporting regions on the first side; and the second electrode, including an electrode spacer positioned between the membrane and a second flow field plate, the electrode spacer comprising a plurality of main ribs, each of the plurality of main ribs contacting the second flow field plate at second supporting regions on the second side, each of the second supporting regions aligned opposite to one of the plurality of first supporting regions. As such, a current density distribution at a plating surface may be reduced.

公开(公告)号：US11791479B2

公开(公告)日：2023-10-17

申请号：US16536259

申请日：2019-08-08

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/0254 ,  H01M8/18 ,  H01M8/0215 ,  H01M8/0221 ,  H01M8/0226

CPC classification number: H01M8/0254 ,  H01M8/0215 ,  H01M8/0221 ,  H01M8/0226 ,  H01M8/188

Abstract: Methods and systems are provided for manufacturing a membrane separator for a redox flow battery. In one example, the membrane separator is fabricate by a calendering process. The membrane separator may be configured with a polymer network to provide selectivity for ion transport across the membrane separator. The membrane separator may be further adapted with an integrated spacer in contact with a negative electrolyte.

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：US20230028170A1

公开(公告)日：2023-01-26

申请号：US17937391

申请日：2022-09-30

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/20 ,  H01M8/00 ,  H01M8/06

Abstract: A method of rebalancing electrolytes in a redox flow battery system comprises directing hydrogen gas generated on the negative side of the redox flow battery system to a catalyst surface, and fluidly contacting the hydrogen gas with an electrolyte comprising a metal ion at the catalyst surface, wherein the metal ion is chemically reduced by the hydrogen gas at the catalyst surface, and a state of charge of the electrolyte and pH of the electrolyte remain substantially balanced.

公开(公告)号：US20220231309A1

公开(公告)日：2022-07-21

申请号：US17653620

申请日：2022-03-04

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Sean Casey ,  Yang Song

IPC: H01M8/0258 ,  H01M8/18 ,  H01M8/0239 ,  H01M4/88 ,  H01M8/20 ,  H01M8/0245

Abstract: A redox flow battery may include: a membrane interposed between a first electrode positioned at a first side of the membrane and a second electrode positioned at a second side of the membrane opposite to the first side; a first flow field plate comprising a plurality of positive flow field ribs, each of the plurality of positive flow field ribs contacting the first electrode at first supporting regions on the first side; and the second electrode, including an electrode spacer positioned between the membrane and a second flow field plate, the electrode spacer comprising a plurality of main ribs, each of the plurality of main ribs contacting the second flow field plate at second supporting regions on the second side, each of the second supporting regions aligned opposite to one of the plurality of first supporting regions. As such, a current density distribution at a plating surface may be reduced.

公开(公告)号：US11374236B2

公开(公告)日：2022-06-28

申请号：US15601560

申请日：2017-05-22

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Sean Casey ,  Yang Song

IPC: H01M8/0258 ,  H01M8/18 ,  H01M8/0239 ,  H01M4/88 ,  H01M8/20 ,  H01M8/0245

Abstract: A redox flow battery may include: a membrane interposed between a first electrode positioned at a first side of the membrane and a second electrode positioned at a second side of the membrane opposite to the first side; a first flow field plate comprising a plurality of positive flow field ribs, each of the plurality of positive flow field ribs contacting the first electrode at first supporting regions on the first side; and the second electrode, including an electrode spacer positioned between the membrane and a second flow field plate, the electrode spacer comprising a plurality of main ribs, each of the plurality of main ribs contacting the second flow field plate at second supporting regions on the second side, each of the second supporting regions aligned opposite to one of the plurality of first supporting regions. As such, a current density distribution at a plating surface may be reduced.

公开(公告)号：US20220149417A1

公开(公告)日：2022-05-12

申请号：US17645293

申请日：2021-12-20

Applicant: ESS Tech, Inc.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/04186 ,  G06V40/13 ,  G06V40/12 ,  H01M8/04537 ,  H01M8/04858 ,  H01M8/06

Abstract: A method of cleansing a redox flow battery system may include operating the redox flow battery system in a charge, discharge, or idle mode, and responsive to a redox flow battery capacity being less than a threshold battery capacity, mixing the positive electrolyte with the negative electrolyte. In this way, battery capacity degradation following cyclic charging and discharging of the redox flow battery system can be substantially reduced.

公开(公告)号：US20210359328A1

公开(公告)日：2021-11-18

申请号：US17308862

申请日：2021-05-05

Applicant: ESS Tech, Inc.

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

IPC: H01M8/18 ,  H01M8/2455

Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a cell stack assembly interposed by two endplates and comprising a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates. In the battery a membrane is coupled to each of the plurality of membrane frame plates and positioned sequentially between two of the bipolar plates included in the plurality of bipolar plates.