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：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.

公开(公告)号：US11888201B2

公开(公告)日：2024-01-30

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

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：US20240030471A1

公开(公告)日：2024-01-25

申请号：US18480426

申请日：2023-10-03

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

IPC: H01M8/0662 ,  H01M8/04276 ,  H01M8/2455 ,  H01M8/18 ,  H01M8/04186

CPC classification number: H01M8/0687 ,  H01M8/04276 ,  H01M8/2455 ,  H01M8/188 ,  H01M8/04186 ,  Y02E60/50

Abstract: A rebalancing reactor for a redox flow battery system may include a first side through which hydrogen gas is flowed, a second side through which electrolyte from the redox flow battery system is flowed, and a porous layer separating and fluidly coupled to the first side and the second side, wherein, the hydrogen gas and the electrolyte are fluidly contacted at a surface of the porous layer, and a pressure drop across the second side is less than a pressure drop across the porous layer. In this way, rebalancing of electrolyte charges in a redox flow battery system may be performed with increased efficiency and cost effectiveness as compared to conventional rebalancing reactors.

公开(公告)号：US20230411643A1

公开(公告)日：2023-12-21

申请号：US18458905

申请日：2023-08-30

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 ,  H01M8/188 ,  H01M8/0215 ,  H01M8/0221 ,  H01M8/0226

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：US11670792B2

公开(公告)日：2023-06-06

申请号：US17308873

申请日：2021-05-05

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.

公开(公告)号：US20230064696A1

公开(公告)日：2023-03-02

申请号：US18049987

申请日：2022-10-26

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：US11296347B2

公开(公告)日：2022-04-05

申请号：US15965722

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  G06K9/00 ,  H01M8/04537 ,  H01M8/04858 ,  H01M8/06 ,  H01M8/04186

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：US09865895B2

公开(公告)日：2018-01-09

申请号：US14201244

申请日：2014-03-07

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/18 ,  H01M8/20

CPC classification number: H01M8/188 ,  H01M8/20 ,  H01M2300/0002 ,  H01M2300/0005 ,  Y02E60/528

Abstract: An iron redox flow battery system, comprising a redox electrode, a plating electrolyte tank, a plating electrode, a redox electrolyte tank with additional acid additives that may be introduced into the electrolytes in response to electrolyte pH. The acid additives may act to suppress undesired chemical reactions that create losses within the battery and may be added in response to sensor indications of these reactions.

公开(公告)号：US09806366B2

公开(公告)日：2017-10-31

申请号：US15297011

申请日：2016-10-18

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M4/00 ,  H01M8/06 ,  H01M8/18 ,  H01M8/20

CPC classification number: H01M8/0693 ,  H01M8/188 ,  H01M8/20 ,  Y02E60/528

Abstract: A redox flow battery system is provided. The system includes a positive electrode in fluid communication with a positive electrolyte comprising a first metal ion and a negative electrode in fluid communication with a negative electrolyte comprising a second metal ion. An electrically insulating ion conducting surface is provided separating the positive electrode from the negative electrode. Further, the system includes a catalyst surface in fluid communication with the first metal ion, the second metal ion, or a combination thereof, and hydrogen gas, wherein the hydrogen gas and the first metal ion, the second metal ion, or a combination thereof are fluidly contacted at the catalyst surface.