公开(公告)号：US11710843B2

公开(公告)日：2023-07-25

申请号：US17308862

申请日：2021-05-05

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：US11682912B2

公开(公告)日：2023-06-20

申请号：US17238099

申请日：2021-04-22

Applicant: ESS TECH, INC.

Inventor： Aaron Vanderzanden ,  Steve Ernst

IPC: H02J7/04 ,  H02J7/16 ,  H02J7/00 ,  H01M8/18

CPC classification number: H02J7/0013 ,  H01M8/188 ,  H02J7/0042

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：US11664512B2

公开(公告)日：2023-05-30

申请号：US17308890

申请日：2021-05-05

Applicant: ESS Tech, Inc.

Inventor： Yang Song ,  Timothy J. McDonald ,  Kenneth Fisher

IPC: H01M8/04276 ,  H01M8/04298 ,  H01M8/18 ,  H01M8/04119

CPC classification number: H01M8/04283 ,  H01M8/04119 ,  H01M8/04298 ,  H01M8/188

Abstract: Methods and systems are provided for a redox flow battery system. In one example, a method of operating a redox flow battery system includes switching the redox flow battery system to an idle mode and completely draining electrolytes from one or more electrode compartments of the redox flow battery system. The one or more electrode compartments may be purged with a gas and refilled with fresh electrolytes.

公开(公告)号：US20230021439A1

公开(公告)日：2023-01-26

申请号：US17936781

申请日：2022-09-29

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

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：US20230014628A1

公开(公告)日：2023-01-19

申请号：US17935370

申请日：2022-09-26

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：US11527771B2

公开(公告)日：2022-12-13

申请号：US17151611

申请日：2021-01-18

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M4/02 ,  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：US20220352536A1

公开(公告)日：2022-11-03

申请号：US17812971

申请日：2022-07-15

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

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：US11264631B2

公开(公告)日：2022-03-01

申请号：US16536216

申请日：2019-08-08

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

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

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.

公开(公告)号：US11233299B2

公开(公告)日：2022-01-25

申请号：US16548500

申请日：2019-08-22

Applicant: ESS TECH, INC.

Inventor： Craig Evans ,  Yang Song

IPC: H01M50/60 ,  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：US20210359331A1

公开(公告)日：2021-11-18

申请号：US17209084

申请日：2021-03-22

Applicant: ESS Tech, Inc.

Inventor： Sean Casey ,  Craig Evans

IPC: H01M8/248 ,  H01M8/18

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system has a set of pressure plates with a sub-stack separator plate arranged between the first pressure plate and the second pressure plate and a first cell stack positioned between the first pressure plate and the sub-stack separator plate. The redox flow battery system may further include a second cell stack positioned between the second pressure plate and the sub-stack separator plate.