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：US11677093B2

公开(公告)日：2023-06-13

申请号：US17308913

申请日：2021-05-05

Applicant: ESS Tech, Inc.

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

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

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

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system includes a cell stack compressed between terminal structures defining ends of the redox flow battery. The cell stack may be formed of a plurality of cells where each cell includes a deformable positive electrode in contact with a first face of a membrane separator and a negative electrode configured to be less compressible than the positive electrode and arranged at a second face of the membrane separator.

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：US20230073599A1

公开(公告)日：2023-03-09

申请号：US17823932

申请日：2022-08-31

Applicant: ESS TECH, INC.

Inventor： Sean Casey

IPC: H01M8/18 ,  H01M4/86 ,  H01M4/88

Abstract: Systems and methods are provided for mechanical pretreatment of bipolar plates, for example, for plating electrodes in redox flow batteries. In one example, a method for disrupting surfaces of a bipolar plate may include pressing the bipolar plate between imprint plates, and removing the pressed bipolar plate from the imprint plates prior to use in a redox flow battery. In some examples, the pressed bipolar plate may include negative indentations from at least one of the imprint plates. In some examples, the imprint plates may be patterned meshes, such that the negative indentations may include patterns of asymmetric protrusions. In this way, the bipolar plate may be pretreated via pressing so as to reduce wear to manufacturing equipment (relative to other mechanical pretreatment processes, for example) while maintaining electrochemical performance of the redox flow battery.

公开(公告)号：US20210359332A1

公开(公告)日：2021-11-18

申请号：US17308913

申请日：2021-05-05

Applicant: ESS Tech, Inc.

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

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

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system includes a cell stack compressed between terminal structures defining ends of the redox flow battery. The cell stack may be formed of a plurality of cells where each cell includes a deformable positive electrode in contact with a first face of a membrane separator and a negative electrode configured to be less compressible than the positive electrode and arranged at a second face of the membrane separator.

公开(公告)号：US20240186556A1

公开(公告)日：2024-06-06

申请号：US18527038

申请日：2023-12-01

Applicant: ESS TECH, INC.

Inventor： Sean Casey

IPC: H01M8/18 ,  H01M4/88 ,  H01M8/0267 ,  H01M50/489

CPC classification number: H01M8/188 ,  H01M4/8864 ,  H01M4/8882 ,  H01M4/8896 ,  H01M8/0267 ,  H01M50/489

Abstract: Systems and methods are provided for an electrode assembly. In one example, a method for fabricating the electrode assembly includes co-extruding a first layer, comprising a conductive thermoplastic, with a second layer, comprising a nonconductive thermoplastic, to form a stack. The stack may be pressed between a set of rollers and cooled to provide a bipolar plate with an integrated negative electrode spacer bonded to a surface of the bipolar plate.

公开(公告)号：US11855312B2

公开(公告)日：2023-12-26

申请号：US17653620

申请日：2022-03-04

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 ,  H01M4/8803 ,  H01M4/8817 ,  H01M4/8828 ,  H01M8/0239 ,  H01M8/0245 ,  H01M8/188 ,  H01M8/20 ,  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：US20220399561A1

公开(公告)日：2022-12-15

申请号：US17821759

申请日：2022-08-23

Applicant: ESS TECH, INC.

Inventor： Sean Casey ,  Craig Evans

IPC: H01M8/248 ,  H01M8/18

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system has a first redox flow battery and a second redox flow battery, stacked above and in contact with the first redox flow battery along a vertical axis of the redox flow battery system. The second redox flow battery may be coupled to the first redox flow battery via nesting detents. Furthermore, operation of the first redox flow battery and the second redox flow battery may be adjustable according to a power demand.

公开(公告)号：US20220231309A1

公开(公告)日：2022-07-21

申请号：US17653620

申请日：2022-03-04

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

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：US11374236B2

公开(公告)日：2022-06-28

申请号：US15601560

申请日：2017-05-22

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

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.