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：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：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.