公开(公告)号：US20210313811A1

公开(公告)日：2021-10-07

申请号：US17238099

申请日：2021-04-22

Applicant: ESS TECH, INC.

Inventor： Aaron Vanderzanden ,  Steve Ernst

IPC: H02J7/00 ,  H01M8/18

Abstract: Systems and methods for operating an electric energy storage system are described. The systems and methods include ways of coupling electric energy storage cell stacks to an electric conductor or bus. The coupling is performed to reduce current flow through contactors and to increase a life span of the contactors.

公开(公告)号：US20210313589A1

公开(公告)日：2021-10-07

申请号：US17235810

申请日：2021-04-20

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song ,  Jeffrey Chen

IPC: H01M4/88 ,  H01M8/0239 ,  H01M8/0245 ,  H01M8/18 ,  H01M8/20

Abstract: An electrode for use in an all-iron redox flow battery is provided. In one example, the electrode may include a plastic mesh; and a coating on the plastic mesh. The coating may be a hydrophilic coating or a conductive coating and the electrode may have an electrode reaction potential is less than 0.8V. Further, a method of manufacturing a coated plastic mesh electrode for use in an all-iron redox flow battery is provided. In one example method, the steps include fabricating a plastic mesh, treating the plastic mesh by applying a solvent treatment or a plasma treatment or a mechanical abrasion treatment; coating the plastic mesh with a material selected from: carbon inks, metal oxides, and hydrophilic polymers.

公开(公告)号：US20210234184A1

公开(公告)日：2021-07-29

申请号：US17229719

申请日：2021-04-13

Applicant: ESS Tech, Inc.

Inventor： Yang Song

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：US20210210775A1

公开(公告)日：2021-07-08

申请号：US17153766

申请日：2021-01-20

Applicant: ESS Tech, Inc.

Inventor： Isaac Walker-Stern ,  Aaron Vanderzanden

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

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：US20210143463A1

公开(公告)日：2021-05-13

申请号：US17151611

申请日：2021-01-18

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：US10586996B2

公开(公告)日：2020-03-10

申请号：US15436593

申请日：2017-02-17

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/18 ,  H01M8/04186 ,  H01M8/04791 ,  H01M8/04701 ,  H01M8/20

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：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.