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.

公开(公告)号：US20250015333A1

公开(公告)日：2025-01-09

申请号：US18889239

申请日：2024-09-18

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  G06V40/12 ,  G06V40/13 ,  H01M8/04186 ,  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：US20240396067A1

公开(公告)日：2024-11-28

申请号：US18792266

申请日：2024-08-01

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Timothy J. McDonald ,  Alexandria Behr

IPC: H01M8/06 ,  H01M8/04186 ,  H01M8/0444 ,  H01M8/04746 ,  H01M8/18

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：US20240387848A1

公开(公告)日：2024-11-21

申请号：US18612325

申请日：2024-03-21

Applicant: ESS TECH, INC.

Inventor： Yan Wu ,  Karana Dunn ,  Yang Song

IPC: H01M8/1039 ,  H01M8/04186 ,  H01M8/10 ,  H01M8/106 ,  H01M8/18

Abstract: Membranes for flow battery cells are provided herein. In one example, a membrane for a flow battery system includes a microporous substrate having a first surface and a second surface, opposite the first surface, and a coating of ion-conducting polymer on the first surface and the second surface, wherein one or more pores of the microporous substrate are at least partially filled with the ion-conducting polymer.

公开(公告)号：US12080931B2

公开(公告)日：2024-09-03

申请号：US18295213

申请日：2023-04-03

Applicant: ESS TECH, INC.

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

IPC: H01M8/18 ,  H01M8/0247 ,  H01M8/242 ,  H01M8/248

CPC classification number: H01M8/188 ,  H01M8/0247 ,  H01M8/242 ,  H01M8/248

Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a cell stack assembly having a plate assembly positioned on a lateral side of the cell stack assembly and comprising an elastic flange including a recess mated with a section of a conductive plate and compliant in at least one of a lateral direction and a vertical direction, and a plate frame coupled to the elastic flange.