公开(公告)号：US20240055642A1

公开(公告)日：2024-02-15

申请号：US18358874

申请日：2023-07-25

Applicant: ESS TECH, INC.

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

IPC: H01M8/18 ,  H01M8/04276 ,  H01M4/96 ,  H01M8/04746 ,  H01M8/04858

CPC classification number: H01M8/188 ,  H01M8/04276 ,  H01M4/96 ,  H01M8/04746 ,  H01M8/04865

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：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：US11791479B2

公开(公告)日：2023-10-17

申请号：US16536259

申请日：2019-08-08

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 ,  H01M8/0215 ,  H01M8/0221 ,  H01M8/0226 ,  H01M8/188

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：US11728497B2

公开(公告)日：2023-08-15

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: H01M8/04 ,  H01M8/04276 ,  H01M8/18 ,  H01M8/04186

CPC classification number: H01M8/04276 ,  H01M8/04186 ,  H01M8/188

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：US20230246219A1

公开(公告)日：2023-08-03

申请号：US18163832

申请日：2023-02-02

Applicant: ESS TECH, INC.

Inventor： Sean Kissick ,  Yang Song

IPC: H01M8/18 ,  H01M8/04186 ,  H01M8/04082 ,  H01M8/04276 ,  H01M16/00 ,  H01M8/0656

CPC classification number: H01M8/188 ,  H01M8/04186 ,  H01M8/04201 ,  H01M8/04276 ,  H01M16/006 ,  H01M8/0656

Abstract: Systems and methods are provided for a redox flow battery system. In one example, the redox flow battery system includes one or more redox flow battery cells, a rebalancing cell receiving electrolyte from the one or more redox flow battery cells and catalyzing hydrogen reduction of metal cations in the electrolyte, and a conductive coupler connecting the rebalancing cell to an external voltage source. The conductive coupler enables application of an ion-repelling potential to a stack of electrode assemblies of the rebalancing cell during operation of the redox flow battery system.

公开(公告)号：US20230155155A1

公开(公告)日：2023-05-18

申请号：US18150751

申请日：2023-01-05

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Kenneth Kiyoshi Fisher ,  Timothy McDonald

IPC: H01M8/18 ,  H01M8/04276 ,  H01M8/04119 ,  H01M4/86 ,  H01M8/04225 ,  H01M50/60

CPC classification number: H01M8/188 ,  H01M4/86 ,  H01M8/04119 ,  H01M8/04225 ,  H01M8/04283 ,  H01M50/60 ,  H01M2004/8684 ,  H01M2004/8689 ,  Y02E60/50

Abstract: Methods and systems are provided for transporting and hydrating a redox flow battery system with a portable field hydration system. In one example, the redox flow battery system may be hydrated with the portable field hydration system in a dry state, in the absence of liquids. In this way, a redox flow battery system may be assembled and transported from a battery manufacturing facility to an end-use location off-site while the redox flow battery system is in the dry state, thereby reducing shipping costs, design complexities, as well as logistical and environmental concerns.

公开(公告)号：US20230089941A1

公开(公告)日：2023-03-23

申请号：US17929623

申请日：2022-09-02

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M8/22 ,  H01M8/06

Abstract: A hybrid redox fuel cell system includes a hybrid redox fuel cell including an anode side through which a reductant is flowed and a cathode side through which liquid electrolyte is flowed, and a trickle bed reactor including a catalyst bed fluidly connected to the cathode side of the hybrid redox fuel cell. Furthermore, the liquid electrolyte includes a metal ion at a higher oxidation state and the metal ion at a lower oxidation state, and power is generated at the hybrid redox fuel cell by way of reducing the metal ion at the higher oxidation state to the lower oxidation state at the cathode side while oxidizing the reductant at the anode side.

公开(公告)号：US20230061531A1

公开(公告)日：2023-03-02

申请号：US17816256

申请日：2022-07-29

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans

IPC: H01M8/18 ,  H01M8/04082

Abstract: Systems and methods are provided for electrolyte and current circulation in a redox flow battery system. In one example, the redox flow battery system may include a plurality of redox flow battery cells electrically coupled in series. In this way, a potential difference across the plurality of redox flow battery cells may be ramped up, such that relatively high voltage external loads may be powered by the redox flow battery system. In some examples, each of the plurality of redox flow battery cells may be fluidically isolated from one another. As such, in one example, the redox flow battery system may further include a plurality of electrolyte storage tanks respectively fluidically coupled to the plurality of redox flow battery cells. Such fluidic isolation of each of the plurality of redox flow battery cells may eliminate stack-to-stack shunting in the redox flow battery system, as well as improve a modularity thereof.

公开(公告)号：US20230028170A1

公开(公告)日：2023-01-26

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

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：US20230016796A1

公开(公告)日：2023-01-19

申请号：US17932245

申请日：2022-09-14

Applicant: ESS TECH, INC.

Inventor： Craig Evans ,  Sean Kissick ,  Yang Song

IPC: H01M8/18 ,  H01M8/0297

Abstract: Systems and methods are provided for a rebalancing cell for a redox flow battery. In one example, a rebalancing cell for a redox flow battery includes a cell enclosure and a stack of electrode assemblies enclosed by the cell enclosure, where each electrode assembly of the stack of electrode assemblies including a positive electrode interfacing with a flow field plate. A face of the flow field plate interfacing with the positive electrode has a plurality of passages including tapered inlets and outlets and partial channels configured to remove gas from electrolyte flowing therethrough.