公开(公告)号：US20220352536A1

公开(公告)日：2022-11-03

申请号：US17812971

申请日：2022-07-15

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M4/58 ,  H01M4/36 ,  H01M8/02

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery is adapted with an additive included in a battery electrolyte and an anion exchange membrane separator dividing positive electrolyte from negative electrolyte. An overall system cost of the battery system may be reduced while a storage capacity, energy density and performance may be increased.

公开(公告)号：US11264631B2

公开(公告)日：2022-03-01

申请号：US16536216

申请日：2019-08-08

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

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

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：US20210242483A1

公开(公告)日：2021-08-05

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

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：US10777913B2

公开(公告)日：2020-09-15

申请号：US15891277

申请日：2018-02-07

Applicant: ESS TECH, INC

Inventor： Craig E. Evans ,  Sean Casey

IPC: H01M10/04 ,  H01M2/20 ,  H01M8/0258 ,  H01M8/248 ,  H01M8/2485 ,  H01R4/48 ,  H01M8/18

Abstract: A leaf spring compression system comprising a mechanical assembly for securing a plurality of leaf springs on a battery cell stack of a flow battery system is disclosed. The cell stack may, comprise: a plurality of cells stacked together to form a flow battery; and a compression system comprising at least two tie rods extending through the plurality of cells clamping a spring acting at opposite ends to compress the cells together, the spring contacting at least two fulcrum elements positioned between the tie rods. In this way, the compression system may exert uniform loading on the battery cell stack, while minimizing deflection of pressure plates attached to the cell stack.

公开(公告)号：US20200052319A1

公开(公告)日：2020-02-13

申请号：US16536237

申请日：2019-08-08

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M4/36 ,  H01M4/58

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery is adapted with an additive included in a battery electrolyte and an anion exchange membrane separator dividing positive electrolyte from negative electrolyte. An overall system cost of the battery system may be reduced while a storage capacity, energy density and performance may be increased.

公开(公告)号：US10403919B2

公开(公告)日：2019-09-03

申请号：US15711879

申请日：2017-09-21

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/20 ,  H01M8/18

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：US10181615B2

公开(公告)日：2019-01-15

申请号：US15182543

申请日：2016-06-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/02 ,  H01M8/18 ,  H01M8/20 ,  H01M8/06 ,  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：US20180309149A1

公开(公告)日：2018-10-25

申请号：US16000724

申请日：2018-06-05

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

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

CPC classification number: H01M8/188 ,  H01M8/004 ,  H01M8/0693 ,  H01M8/20 ,  Y02E60/528

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：US20170179516A1

公开(公告)日：2017-06-22

申请号：US15436593

申请日：2017-02-17

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/18 ,  H01M8/04791 ,  H01M8/04701 ,  H01M8/04186

Abstract: A method of operating an iron redox flow battery system may comprise fluidly coupling a plating electrode of an iron redox flow battery cell to a plating electrolyte; fluidly coupling a redox electrode of the iron redox flow battery cell to a redox electrolyte; fluidly coupling a ductile plating additive to one or both of the plating electrolyte and the redox electrolyte; and increasing an amount of the ductile plating additive to the plating electrolyte in response to an increase in the plating stress at the plating electrode. In this way, ductile Fe can be plated on the negative electrode, and the performance, reliability and efficiency of the iron redox flow battery can be maintained. In addition, iron can be more rapidly produced and plated at the plating electrode, thereby achieving a higher charging rate for all iron flow batteries.

公开(公告)号：US12176590B2

公开(公告)日：2024-12-24

申请号：US17645293

申请日：2021-12-20

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.