公开(公告)号：US11929534B2

公开(公告)日：2024-03-12

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

CPC classification number: H01M8/188

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：US20240047707A1

公开(公告)日：2024-02-08

申请号：US18486073

申请日：2023-10-12

Applicant: ESS TECH, INC.

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

IPC: H01M8/0258 ,  H01M8/18 ,  H01M8/0239 ,  H01M4/88 ,  H01M8/20 ,  H01M8/0245

CPC classification number: H01M8/0258 ,  H01M8/188 ,  H01M8/0239 ,  H01M4/8817 ,  H01M4/8803 ,  H01M8/20 ,  H01M4/8828 ,  H01M8/0245 ,  Y02E60/50

Abstract: A redox flow battery may include: a membrane interposed between a first electrode positioned at a first side of the membrane and a second electrode positioned at a second side of the membrane opposite to the first side; a first flow field plate comprising a plurality of positive flow field ribs, each of the plurality of positive flow field ribs contacting the first electrode at first supporting regions on the first side; and the second electrode, including an electrode spacer positioned between the membrane and a second flow field plate, the electrode spacer comprising a plurality of main ribs, each of the plurality of main ribs contacting the second flow field plate at second supporting regions on the second side, each of the second supporting regions aligned opposite to one of the plurality of first supporting regions. As such, a current density distribution at a plating surface may be reduced.

公开(公告)号：US20230282862A1

公开(公告)日：2023-09-07

申请号：US18316977

申请日：2023-05-12

Applicant: ESS TECH, INC.

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

IPC: H01M8/18 ,  H01M8/2455

CPC classification number: H01M8/188 ,  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 and comprising a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates. In the battery a membrane is coupled to each of the plurality of membrane frame plates and positioned sequentially between two of the bipolar plates included in the plurality of bipolar plates.

公开(公告)号：US20230268541A1

公开(公告)日：2023-08-24

申请号：US18311111

申请日：2023-05-02

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

IPC: H01M8/18 ,  H01M4/66 ,  H01M8/0202 ,  H01M50/46

CPC classification number: H01M8/188 ,  H01M4/663 ,  H01M8/0202 ,  H01M50/46

Abstract: Methods and systems are provided for manufacturing a bipolar plate for a redox flow battery. In one example, the bipolar plate is fabricated by a roll-to-roll process. The bipolar plate includes a non-conductive substrate that is coupled to a negative electrode on a first surface and coupled to a positive electrode on a second surface, the first surface opposite of the second surface.

公开(公告)号：US20230253601A1

公开(公告)日：2023-08-10

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：US11688874B2

公开(公告)日：2023-06-27

申请号：US17234462

申请日：2021-04-19

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

IPC: H01M8/18 ,  H01M4/66 ,  H01M8/0202 ,  H01M50/46

CPC classification number: H01M8/188 ,  H01M4/663 ,  H01M8/0202 ,  H01M50/46

Abstract: Methods and systems are provided for manufacturing a bipolar plate for a redox flow battery. In one example, the bipolar plate is fabricated by a roll-to-roll process. The bipolar plate includes a non-conductive substrate that is coupled to a negative electrode on a first surface and coupled to a positive electrode on a second surface, the first surface opposite of the second surface.

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：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.