公开(公告)号：US20240154140A1

公开(公告)日：2024-05-09

申请号：US18495591

申请日：2023-10-26

Applicant: ESS TECH, INC.

Inventor： Samuel Ryan

IPC: H01M8/04276 ,  H01M8/0438 ,  H01M8/04858 ,  H01M8/18

CPC classification number: H01M8/04276 ,  H01M8/0438 ,  H01M8/04917 ,  H01M8/188

Abstract: Systems and methods are provided for an energy storage system. In one example, the energy storage system comprises a first tube configured to flow an electrolyte solution to a pump, a second tube extending through the first tube, the second tube hermetically sealed from an interior of the first tube, and a wire wound within the second tube configured to generate a magnetic field.

公开(公告)号：US20240063416A1

公开(公告)日：2024-02-22

申请号：US17821400

申请日：2022-08-22

Applicant: ESS Tech, Inc.

Inventor： Sean Kissick ,  Yang Song ,  Timothy J. McDonald

IPC: H01M8/18 ,  H01M8/22

CPC classification number: H01M8/188 ,  H01M8/225

Abstract: Systems and methods are provided for rebalancing cells in a redox flow battery. In one example, a rebalancing cell system includes a first rebalancing cell in series fluidic communication with a second rebalancing cell and a hydrogen source, the first rebalancing cell includes a first electrode assembly stack with hydrogen flow paths extending therethrough and having a higher pressure than an electrolyte in the first electrode assembly stack. Further, the second rebalancing cell includes a second electrode assembly stack with hydrogen flow paths that extend therethrough and have a higher pressure than an electrolyte in the second electrode assembly stack.

公开(公告)号：US20240055643A1

公开(公告)日：2024-02-15

申请号：US18358877

申请日：2023-07-25

Applicant: ESS TECH, INC.

Inventor： Sean Kissick ,  Timothy J. McDonald ,  Yang Song

IPC: H01M8/18 ,  H01M8/04276 ,  H01M8/0438 ,  H01M8/04746 ,  F17C5/06

CPC classification number: H01M8/188 ,  H01M8/04276 ,  H01M8/04425 ,  H01M8/04776 ,  F17C5/06 ,  F17C2201/018 ,  F17C2205/0134 ,  F17C2223/031 ,  F17C2225/033 ,  F17C2205/0332 ,  F17C2250/043 ,  F17C2221/012 ,  F17C2250/0647 ,  F17C2250/03

Abstract: Systems and methods are provided for managing health of electrolytes of redox flow battery system. Components of the system may include a redox rebalancing cells and a gas storage system. The redox rebalancing cell may be operated by plating iron on a plating electrode, treating a negative electrolyte of the redox flow battery system with the plated iron and returning the negative electrolyte to an electrolyte tank. The gas storage system may include a set of expandable gas storage tanks coupled to at least one electrolyte storage tank and an electrolyte rebalancing system of the redox flow battery system.

公开(公告)号：US20240039005A1

公开(公告)日：2024-02-01

申请号：US18360693

申请日：2023-07-27

Applicant: ESS TECH, INC.

Inventor： Neal Walters Kuperman ,  Yang Song

IPC: H01M4/90 ,  H01M8/18

CPC classification number: H01M4/90 ,  H01M8/188

Abstract: Systems and methods are provided for an electrolyte for a flow battery comprising a redox active species and a plurality of supporting salts dissolved in the electrolyte. The redox active species having a concentration greater than 2.0 M and the plurality of dissolved supporting salts comprising a potassium salt, and ammonium salt, a calcium salt, and a manganese salt.

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：US11764380B2

公开(公告)日：2023-09-19

申请号：US17453993

申请日：2021-11-08

Applicant: ESS Tech, Inc.

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

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

CPC classification number: H01M8/0693 ,  H01M8/0444 ,  H01M8/04186 ,  H01M8/04753 ,  H01M8/188

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：US11749827B2

公开(公告)日：2023-09-05

申请号：US17080702

申请日：2020-10-26

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Brady Thompson ,  Timothy J. McDonald

IPC: H01M8/18 ,  H01M8/04537 ,  H01M8/04858 ,  H01M4/52

CPC classification number: H01M8/188 ,  H01M4/521 ,  H01M8/04604 ,  H01M8/04895

Abstract: Methods and systems are provided for iron preformation in a redox flow battery. In one example, a method may include, in a first condition, discharging and then charging the redox flow battery, and in a second condition, charging the redox flow battery including preforming iron metal at a negative electrode of the redox flow battery, and thereafter entering an idle mode of the redox flow battery including adjusting one or more electrolyte conditions. In some examples, each of preforming the iron metal and adjusting the one or more electrolyte conditions may increase a battery charge capacity to greater than a threshold battery charge capacity.

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.