公开(公告)号：US20250015333A1

公开(公告)日：2025-01-09

申请号：US18889239

申请日：2024-09-18

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.

公开(公告)号：US20240396067A1

公开(公告)日：2024-11-28

申请号：US18792266

申请日：2024-08-01

Applicant: ESS TECH, INC.

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

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

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：US20240387848A1

公开(公告)日：2024-11-21

申请号：US18612325

申请日：2024-03-21

Applicant: ESS TECH, INC.

Inventor： Yan Wu ,  Karana Dunn ,  Yang Song

IPC: H01M8/1039 ,  H01M8/04186 ,  H01M8/10 ,  H01M8/106 ,  H01M8/18

Abstract: Membranes for flow battery cells are provided herein. In one example, a membrane for a flow battery system includes a microporous substrate having a first surface and a second surface, opposite the first surface, and a coating of ion-conducting polymer on the first surface and the second surface, wherein one or more pores of the microporous substrate are at least partially filled with the ion-conducting polymer.

公开(公告)号：US12095130B2

公开(公告)日：2024-09-17

申请号：US17823932

申请日：2022-08-31

Applicant: ESS TECH, INC.

Inventor： Sean Casey

IPC: H01M8/18 ,  H01M4/86 ,  H01M4/88

CPC classification number: H01M8/188 ,  H01M4/8631 ,  H01M4/8875 ,  H01M2004/8694

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：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：US12080930B2

公开(公告)日：2024-09-03

申请号：US17456948

申请日：2021-11-30

Applicant: ESS Tech, Inc.

Inventor： Yang Song ,  Kenneth Kiyoshi Fisher ,  Timothy McDonald

IPC: H01M8/18 ,  H01M8/0202 ,  H01M8/0289 ,  H01M8/04007 ,  H01M8/04082 ,  H01M8/04089 ,  H01M8/2455 ,  H01M8/2484

CPC classification number: H01M8/188 ,  H01M8/0202 ,  H01M8/0289 ,  H01M8/04037 ,  H01M8/04097 ,  H01M8/04201 ,  H01M8/2455 ,  H01M8/2484 ,  Y02E60/50

Abstract: A multi-chambered electrolyte storage tank for a redox flow battery system, may include first and second electrolyte chambers, and a bulkhead, wherein the first and second electrolyte chambers are fluidly coupled to first and second sides of a redox flow battery cell, respectively, the first and second electrolyte chambers include first and second liquid electrolyte volumes, respectively, and the first and second liquid electrolyte volumes are separated by the bulkhead positioned therebetween. In this way, manufacturing and operational complexity of a redox flow battery system can be reduced.

公开(公告)号：US20240274853A1

公开(公告)日：2024-08-15

申请号：US18410955

申请日：2024-01-11

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Gainer Phay

IPC: H01M8/18 ,  H01M8/04186 ,  H01M8/04276 ,  H01M8/0432 ,  H01M8/0444 ,  H01M8/04701 ,  H01M8/04746 ,  H01M8/04791 ,  H01M8/2455

CPC classification number: H01M8/188 ,  H01M8/04186 ,  H01M8/04276 ,  H01M8/0482 ,  H01M8/2455 ,  H01M8/0432 ,  H01M8/04477 ,  H01M8/04708 ,  H01M8/04753

Abstract: Systems and methods are provided for rebalancing electrolytes of a redox flow battery system. The redox flow battery system includes a positive electrolyte, a negative electrolyte, and a battery stack configured to receive the positive and negative electrolytes. Additionally, the battery stack includes an internal rebalancing reactor positioned internal to the battery stack and in fluid contact with the negative electrolyte.

公开(公告)号：US20240238743A1

公开(公告)日：2024-07-18

申请号：US18409674

申请日：2024-01-10

Applicant: ESS TECH, INC.

Inventor： Nicholas Chen

IPC: B01F33/453

CPC classification number: B01F33/453 ,  B01F2101/59

Abstract: Systems and methods are provided for an external electromagnetic mixing system. The external electromagnetic mixing system includes a plurality of electromagnetics spaced externally around a production tank which contains a liquid and a ferromagnetic and/or ferrimagnetic solid. The plurality of electromagnets are configured to move the ferromagnetic and/or ferrimagnetic solid within the liquid.

公开(公告)号：US20240217034A1

公开(公告)日：2024-07-04

申请号：US18395202

申请日：2023-12-22

Applicant: ESS TECH, INC.

Inventor： Nathan Imholt ,  Brady Thompson

IPC: B23K26/362 ,  B23K26/352 ,  B23K26/60 ,  B23K26/70 ,  H01M8/026 ,  H01M8/18

CPC classification number: B23K26/362 ,  B23K26/3584 ,  B23K26/60 ,  B23K26/703 ,  H01M8/026 ,  H01M8/188

Abstract: Systems and methods are provided for surface pretreatment of a bipolar plate for a battery system. In one example, a method for pretreating the bipolar plate includes extruding a material of the bipolar plate and irradiating a surface of the bipolar plate with a laser beam to etch a pattern into the surface. The method may further includes assembling the bipolar plate into a power module of the battery system.

公开(公告)号：US20240194907A1

公开(公告)日：2024-06-13

申请号：US18537641

申请日：2023-12-12

Applicant: ESS TECH, INC.

Inventor： Thiago Groberg ,  Craig Evans

IPC: H01M8/04082 ,  H01M8/0438 ,  H01M8/04746 ,  H01M8/04858

CPC classification number: H01M8/04201 ,  H01M8/04388 ,  H01M8/04753 ,  H01M8/04947 ,  H01M8/188

Abstract: Systems and methods are provided for actively directing hydrogen flow in an electrochemical cell system. The electrochemical cell system includes a component configured to receive hydrogen gas, one or more hydrogen blower assemblies positioned upstream and/or downstream of the component. The one or more hydrogen blowers include at least one sensor positioned on an outer surface of the one or more hydrogen blower assemblies and a controller including instructions to generate a notification in response to an output of the at least one sensor being outside of a target range.