公开(公告)号：US12283730B2

公开(公告)日：2025-04-22

申请号：US17229719

申请日：2021-04-13

Applicant: ESS Tech, Inc.

Inventor： Yang Song

IPC: H01M8/18 ,  H01M4/36 ,  H01M4/58 ,  H01M8/02 ,  H01M8/1018

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：US20240194922A1

公开(公告)日：2024-06-13

申请号：US18537673

申请日：2023-12-12

Applicant: ESS TECH, INC.

Inventor： Thiago Groberg ,  Craig Evans

IPC: H01M8/18 ,  F04D25/02 ,  F04D29/28 ,  F04D29/42 ,  F04D29/66 ,  H01M8/04082 ,  H01M8/04089 ,  H01M8/06

CPC classification number: H01M8/188 ,  F04D25/02 ,  F04D29/281 ,  F04D29/4206 ,  F04D29/662 ,  H01M8/04089 ,  H01M8/04201 ,  H01M8/0693

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.

公开(公告)号：US20240162722A1

公开(公告)日：2024-05-16

申请号：US18504908

申请日：2023-11-08

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig Evans ,  Timothy J. McDonald

IPC: H02J7/00 ,  H01M8/04858 ,  H01M8/04992 ,  H01M8/18

CPC classification number: H02J7/0013 ,  H01M8/04895 ,  H01M8/04992 ,  H01M8/188 ,  H02J7/0068

Abstract: Systems and methods are provided for operating a battery power module. In one example, the method may include constraining an electrical parameter of the battery power module to be constant among a plurality of battery stacks of the battery power module and determining current setpoints for each of the plurality of battery stacks of the battery power module based on an estimated overpotential of each of the plurality of battery stacks of the battery power module.

公开(公告)号：US20240151572A1

公开(公告)日：2024-05-09

申请号：US18481083

申请日：2023-10-04

Applicant: ESS TECH, INC.

Inventor： Joseph M. Cooley

IPC: G01F23/28 ,  G01F23/284 ,  G01F23/2962 ,  H01M8/04082 ,  H01M8/04298 ,  H01M8/18

CPC classification number: G01F23/28 ,  G01F23/284 ,  G01F23/2962 ,  H01M8/04201 ,  H01M8/04298 ,  H01M8/188

Abstract: Systems and methods are provided for a non-contact level sensor system for a liquid tank. The non-contact level sensor system includes a non-contact level sensor positioned above a maximum level of liquid in the liquid tank, a float configured to float on a surface of the liquid and reflect and/or scatter energy emitted by the non-contact level sensor. The position of the float in a plane perpendicular to the energy emitted by the non-contact level sensor is confined within a housing, and the vertical distance between the float and the non-contact level sensor is related to an amount of liquid inside the liquid tank.

公开(公告)号：US11929534B2

公开(公告)日：2024-03-12

申请号：US17070852

申请日：2020-10-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Brady Thompson

IPC: H01M8/18

CPC classification number: H01M8/188

Abstract: A method for a redox flow battery may include, interrupting cycling of the redox flow battery, including charging the redox flow battery to a threshold charge condition, draining positive and negative electrolyte from the redox flow battery, circulating a wash solution through the redox flow battery, and returning the positive and negative electrolyte to the redox flow battery, and resuming cycling of the redox flow battery. In this way, contamination of the redox flow battery system can be reduced, thereby prolonging the life and increasing performance of the redox flow battery system.

公开(公告)号：US20240063410A1

公开(公告)日：2024-02-22

申请号：US18495580

申请日：2023-10-26

Applicant: ESS TECH, INC.

Inventor： Isaac Walker-Stern ,  Aaron Vanderzanden

IPC: H01M8/04186 ,  H01M8/04276 ,  H01M8/04537 ,  H01M8/04955 ,  H01M8/18

CPC classification number: H01M8/04186 ,  H01M8/04276 ,  H01M8/04574 ,  H01M8/04955 ,  H01M8/188

Abstract: Systems and methods for operating an electric energy storage device are described. The systems and methods may reduce a voltage potential between a ground reference and terminals of an electric energy storage device. By lowering the voltage potential, a possibility of unintentionally discharging the electrical energy storage device to ground may be reduced.

公开(公告)号：US20240047707A1

公开(公告)日：2024-02-08

申请号：US18486073

申请日：2023-10-12

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 ,  H01M8/188 ,  H01M8/0239 ,  H01M4/8817 ,  H01M4/8803 ,  H01M8/20 ,  H01M4/8828 ,  H01M8/0245 ,  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：US11764369B2

公开(公告)日：2023-09-19

申请号：US17650513

申请日：2022-02-09

Applicant: ESS Tech, Inc.

Inventor： Yang Song ,  Yan Wu ,  Brady Thompson

IPC: H01M8/0247 ,  H01M8/0228 ,  H01M8/18

CPC classification number: H01M8/0247 ,  H01M8/0228 ,  H01M8/188

Abstract: Systems and methods are provided for electrochemical and/or chemical pretreatment of bipolar plates, for example, for plating electrodes in redox flow batteries. In one example, a method may include pretreating a bipolar plate for the redox flow battery by disrupting a surface of the bipolar plate. In some examples, pretreating the bipolar plate may include positioning the bipolar plate within the redox flow battery, and thereafter charging the redox flow battery at multiple discrete plating current densities for each of one or more initial charging cycles to electrochemically etch the surface. In additional or alternative examples, pretreating the bipolar plate may include soaking the bipolar plate in solution to chemically treat the surface. In this way, the bipolar plate may be pretreated via electrochemical etching and/or chemical treatment so as to reduce electrochemical performance losses and dendrite formation in the redox flow battery.

公开(公告)号：US20230282862A1

公开(公告)日：2023-09-07

申请号：US18316977

申请日：2023-05-12

Applicant: ESS TECH, INC.

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

IPC: H01M8/18 ,  H01M8/2455

CPC classification number: H01M8/188 ,  H01M8/2455

Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a cell stack assembly interposed by two endplates and comprising a plurality of mated membrane frame plates and bipolar frame plates forming, at a mated interface, a plurality of negative and positive flow channels configured to distribute negative and positive electrolyte into a plurality of bipolar plates. In the battery a membrane is coupled to each of the plurality of membrane frame plates and positioned sequentially between two of the bipolar plates included in the plurality of bipolar plates.

公开(公告)号：US20230268541A1

公开(公告)日：2023-08-24

申请号：US18311111

申请日：2023-05-02

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

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

CPC classification number: H01M8/188 ,  H01M4/663 ,  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.