公开(公告)号：US20210359329A1

公开(公告)日：2021-11-18

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 ,  H01M8/248 ,  H01M8/242 ,  H01M8/0247

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：US20210242479A1

公开(公告)日：2021-08-05

申请号：US17234509

申请日：2021-04-19

Applicant: ESS TECH, INC.

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

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

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：US20210143455A1

公开(公告)日：2021-05-13

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: H01M8/04276 ,  H01M8/04186 ,  H01M8/18

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：US20210135269A1

公开(公告)日：2021-05-06

申请号：US17070852

申请日：2020-10-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Brady Thompson

IPC: H01M8/18

Abstract: A method for a redox flow battery may include, interrupting cycling of the redox flow battery, including charging the redox flow battery to a threshold charge condition, draining positive and negative electrolyte from the redox flow battery, circulating a wash solution through the redox flow battery, and returning the positive and negative electrolyte to the redox flow battery, and resuming cycling of the redox flow battery. In this way, contamination of the redox flow battery system can be reduced, thereby prolonging the life and increasing performance of the redox flow battery system.

公开(公告)号：US10230125B2

公开(公告)日：2019-03-12

申请号：US14588225

申请日：2014-12-31

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：US20180316037A1

公开(公告)日：2018-11-01

申请号：US15965722

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/06 ,  H01M8/04858 ,  H01M8/04537

CPC classification number: G06K9/0002 ,  G06K9/0012

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：US20180316032A1

公开(公告)日：2018-11-01

申请号：US15965709

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Evan Doremus ,  Thiago Groberg

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

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：US20160190604A1

公开(公告)日：2016-06-30

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 ,  H01M8/18 ,  H01M8/0256 ,  H01M8/0239 ,  H01M8/0245

CPC classification number: H01M4/8803 ,  H01M4/8817 ,  H01M4/8828 ,  H01M8/0239 ,  H01M8/0245 ,  H01M8/188 ,  H01M8/20 ,  Y02E60/528

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.

Abstract translation: 提供了一种用于全铁氧化还原液流电池的电极。 在一个示例中，电极可以包括塑料网; 和塑料网上的涂层。 涂层可以是亲水性涂层或导电涂层，并且电极的电极反应电位可能小于0.8V。 此外，提供了一种制造用于全铁氧化还原液流电池的涂覆塑料网状电极的方法。 在一个示例性方法中，步骤包括制造塑料网，通过施加溶剂处理或等离子体处理或机械磨损处理来处理塑料网; 用选自：碳油墨，金属氧化物和亲水性聚合物的材料涂覆塑料网。