公开(公告)号：US20210075039A1

公开(公告)日：2021-03-11

申请号：US17099191

申请日：2020-11-16

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Timothy J. McDonald ,  Thiago Groberg

IPC: H01M8/04537 ,  H01M8/18 ,  H01M8/04858 ,  H01M8/04955

Abstract: Systems and methods for operating an electric energy storage device are described. The systems and methods may generate a state of charge estimate that is based on negative electrode plating. An overall state of charge may be determined from the state of charge estimate that is based on negative electrode plating and a state of charge estimate that is not based on negative electrode plating.

公开(公告)号：US20200052319A1

公开(公告)日：2020-02-13

申请号：US16536237

申请日：2019-08-08

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M4/36 ,  H01M4/58

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：US20200006744A1

公开(公告)日：2020-01-02

申请号：US16548500

申请日：2019-08-22

Applicant: ESS TECH, INC.

Inventor： Craig Evans ,  Yang Song

IPC: H01M2/36 ,  H01M8/18 ,  H01M8/20 ,  H01M8/04186

Abstract: In one example, a system for a flow cell for a flow battery, comprising: a first flow field; and a polymeric frame, comprising: a top face; a bottom face, opposite the top face; a first side; a second side, opposite the first side; a first electrolyte inlet located on the top face and the first side of the polymeric frame; a first electrolyte outlet located on the top face and the second side of the polymeric frame; a first electrolyte inlet flow path located within the polymeric frame and coupled to the first electrolyte inlet; and a first electrolyte outlet flow path located within the polymeric frame and coupled to the first electrolyte outlet. In this way, shunt currents may be minimized by increasing the length and/or reducing the cross-sectional area of the electrolyte inlet and electrolyte outlet flow paths.

公开(公告)号：US10439197B2

公开(公告)日：2019-10-08

申请号：US15476795

申请日：2017-03-31

Applicant: ESS TECH, INC.

Inventor： Craig Evans ,  Yang Song

IPC: H01M2/36 ,  H01M8/18 ,  H01M8/20 ,  H01M8/04186

Abstract: In one example, a system for a flow cell for a flow battery, comprising: a first flow field; and a polymeric frame, comprising: a top face; a bottom face, opposite the top face; a first side; a second side, opposite the first side; a first electrolyte inlet located on the top face and the first side of the polymeric frame; a first electrolyte outlet located on the top face and the second side of the polymeric frame; a first electrolyte inlet flow path located within the polymeric frame and coupled to the first electrolyte inlet; and a first electrolyte outlet flow path located within the polymeric frame and coupled to the first electrolyte outlet. In this way, shunt currents may be minimized by increasing the length and/or reducing the cross-sectional area of the electrolyte inlet and electrolyte outlet flow paths.

公开(公告)号：US10403919B2

公开(公告)日：2019-09-03

申请号：US15711879

申请日：2017-09-21

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/20 ,  H01M8/18

Abstract: An iron redox flow battery system, comprising a redox electrode, a plating electrolyte tank, a plating electrode, a redox electrolyte tank with additional acid additives that may be introduced into the electrolytes in response to electrolyte pH. The acid additives may act to suppress undesired chemical reactions that create losses within the battery and may be added in response to sensor indications of these reactions.

公开(公告)号：US10181615B2

公开(公告)日：2019-01-15

申请号：US15182543

申请日：2016-06-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/02 ,  H01M8/18 ,  H01M8/20 ,  H01M8/06 ,  H01M8/00

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：US20180316036A1

公开(公告)日：2018-11-01

申请号：US15965671

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Kenneth Kiyoshi Fisher ,  Timothy McDonald

IPC: H01M8/18 ,  H01M8/04276 ,  H01M8/04119 ,  H01M4/86 ,  H01M2/36

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：US20180309149A1

公开(公告)日：2018-10-25

申请号：US16000724

申请日：2018-06-05

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/18 ,  H01M8/00 ,  H01M8/20 ,  H01M8/06

CPC classification number: H01M8/188 ,  H01M8/004 ,  H01M8/0693 ,  H01M8/20 ,  Y02E60/528

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：US20170179516A1

公开(公告)日：2017-06-22

申请号：US15436593

申请日：2017-02-17

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

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

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.