公开(公告)号：US20210359327A1

公开(公告)日：2021-11-18

申请号：US17308845

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, the cell stack assembly includes a plurality of mated membrane frame plates and bipolar frame plates. For each pair of mated membrane and bipolar frame plates a negative shunt channel and a positive shunt channel are formed and the negative and positive shunt channels are in fluidic communication with a plurality of inlet and outlet distribution channels that are in fluidic communication with at least one bipolar plate.

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：US11043679B2

公开(公告)日：2021-06-22

申请号：US14984416

申请日：2015-12-30

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song ,  Jeffrey Chen

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

Abstract: An electrode for use in an all-iron redox flow battery is provided. In one example, the electrode may include a plastic mesh; and a coating on the plastic mesh. The coating may be a hydrophilic coating or a conductive coating and the electrode may have an electrode reaction potential is less than 0.8V. Further, a method of manufacturing a coated plastic mesh electrode for use in an all-iron redox flow battery is provided. In one example method, the steps include fabricating a plastic mesh, treating the plastic mesh by applying a solvent treatment or a plasma treatment or a mechanical abrasion treatment; coating the plastic mesh with a material selected from: carbon inks, metal oxides, and hydrophilic polymers.

公开(公告)号：US10923753B2

公开(公告)日：2021-02-16

申请号：US16201974

申请日：2018-11-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M4/02 ,  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：US10680268B2

公开(公告)日：2020-06-09

申请号：US16196332

申请日：2018-11-20

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/18

Abstract: Methods and systems are provided which maintain the positive and negative electrolyte pH and stability of a redox flow battery through the use of electrochemical rebalancing cells. The electrochemical cells may be activated by applying an electrical load to affect changes to the pH of the electrolytes. The use of the electrochemical cells improves long term performance stability redox flow batteries by decreasing and/or eliminating Fe(OH)3 precipitation formation.

公开(公告)号：US10680263B2

公开(公告)日：2020-06-09

申请号：US15965709

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Evan Doremus ,  Thiago Groberg

IPC: H01M8/18 ,  H01M8/04746 ,  H01M8/04537 ,  H01M8/04082 ,  H01M8/04186

Abstract: A method of operating a redox flow battery, may include maintaining a positive electrode compartment pressure greater than a negative electrode compartment pressure, and maintaining a cross-over pressure less than a membrane break-through pressure, wherein the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure. In this way, ionic resistance across the separator can be maintained at a lower level by reducing gas bubbles trapped therein while reducing separator break-through, thereby increasing performance of the redox flow battery system.

公开(公告)号：US20200052310A1

公开(公告)日：2020-02-13

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 ,  H01M8/0226 ,  H01M8/0221 ,  H01M8/0215

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：US20190097253A1

公开(公告)日：2019-03-28

申请号：US16201974

申请日：2018-11-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/20 ,  H01M8/00

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：US20190088973A1

公开(公告)日：2019-03-21

申请号：US16196332

申请日：2018-11-20

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/18

Abstract: Methods and systems are provided which maintain the positive and negative electrolyte pH and stability of a redox flow battery through the use of electrochemical rebalancing cells. The electrochemical cells may be activated by applying an electrical load to affect changes to the pH of the electrolytes. The use of the electrochemical cells improves long term performance stability redox flow batteries by decreasing and/or eliminating Fe(OH)3 precipitation formation.

公开(公告)号：US20180316035A1

公开(公告)日：2018-11-01

申请号：US15965627

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Kenneth Kiyoshi Fisher ,  Timothy McDonald

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

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.