公开(公告)号：US20200052318A1

公开(公告)日：2020-02-13

申请号：US16536216

申请日：2019-08-08

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

IPC: H01M8/18 ,  H01M8/0202 ,  H01M4/66 ,  H01M2/16

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：US20180316033A1

公开(公告)日：2018-11-01

申请号：US15965728

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans

IPC: H01M8/0662 ,  H01M8/18 ,  H01M8/2455 ,  H01M8/04276

Abstract: A rebalancing reactor for a redox flow battery system may include a first side through which hydrogen gas is flowed, a second side through which electrolyte from the redox flow battery system is flowed, and a porous layer separating and fluidly coupled to the first side and the second side, wherein, the hydrogen gas and the electrolyte are fluidly contacted at a surface of the porous layer, and a pressure drop across the second side is less than a pressure drop across the porous layer. In this way, rebalancing of electrolyte charges in a redox flow battery system may be performed with increased efficiency and cost effectiveness as compared to conventional rebalancing reactors.

公开(公告)号：US20180233834A1

公开(公告)日：2018-08-16

申请号：US15891277

申请日：2018-02-07

Applicant: ESS TECH, INC

Inventor： Craig E. Evans ,  Sean Casey

IPC: H01R4/48 ,  H01M8/2485 ,  H01M8/248 ,  H01M8/0258 ,  H01M10/04 ,  H01M2/20

Abstract: A leaf spring compression system comprising a mechanical assembly for securing a plurality of leaf springs on a battery cell stack of a flow battery system is disclosed. The cell stack may, comprise: a plurality of cells stacked together to form a flow battery; and a compression system comprising at least two tie rods extending through the plurality of cells clamping a spring acting at opposite ends to compress the cells together, the spring contacting at least two fulcrum elements positioned between the tie rods. In this way, the compression system may exert uniform loading on the battery cell stack, while minimizing deflection of pressure plates attached to the cell stack.

公开(公告)号：US20180013164A1

公开(公告)日：2018-01-11

申请号：US15711879

申请日：2017-09-21

Applicant: ESS TECH, INC.

Inventor： Craig E. Evans ,  Yang Song

IPC: H01M8/18 ,  H01M8/20

CPC classification number: H01M8/188 ,  H01M8/20 ,  H01M2300/0002 ,  H01M2300/0005 ,  Y02E60/528

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：US20170256803A1

公开(公告)日：2017-09-07

申请号：US15601560

申请日：2017-05-22

Applicant: ESS TECH, INC.

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

IPC: H01M8/0258 ,  H01M8/18

CPC classification number: H01M8/0258 ,  H01M4/8803 ,  H01M4/8817 ,  H01M4/8828 ,  H01M8/0239 ,  H01M8/0245 ,  H01M8/188 ,  H01M8/20 ,  Y02E60/528

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：US20170040630A1

公开(公告)日：2017-02-09

申请号：US15297011

申请日：2016-10-18

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

IPC: H01M8/06 ,  H01M8/18 ,  H01M8/20

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

Abstract: A redox flow battery system is provided. The system includes a positive electrode in fluid communication with a positive electrolyte comprising a first metal ion and a negative electrode in fluid communication with a negative electrolyte comprising a second metal ion. An electrically insulating ion conducting surface is provided separating the positive electrode from the negative electrode. Further, the system includes a catalyst surface in fluid communication with the first metal ion, the second metal ion, or a combination thereof, and hydrogen gas, wherein the hydrogen gas and the first metal ion, the second metal ion, or a combination thereof are fluidly contacted at the catalyst surface.

Abstract translation: 提供氧化还原液流电池系统。 该系统包括与包含与包含第二金属离子的负电解质流体连通的第一金属离子和负极的正电解质流体连通的正电极。 提供了将正极与负极分离的电绝缘离子传导表面。 此外，该系统包括与第一金属离子，第二金属离子或其组合流体连通的催化剂表面和氢气，其中氢气和第一金属离子，第二金属离子或其组合 在催化剂表面流体接触。

公开(公告)号：US20160293992A1

公开(公告)日：2016-10-06

申请号：US15182543

申请日：2016-06-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans

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

CPC classification number: H01M8/188 ,  H01M8/004 ,  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.

Abstract translation: 在氧化还原液流电池系统中重新平衡电解质的方法包括将在氧化还原液流电池系统的负极侧产生的氢气引导到催化剂表面，并且在催化剂表面处将氢气与包含金属离子的电解液流体接触，其中 金属离子被催化剂表面的氢气化学还原，并且电解质的电荷状态和电解液的pH保持基本平衡。

公开(公告)号：US12266829B2

公开(公告)日：2025-04-01

申请号：US18324044

申请日：2023-05-25

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Craig E. Evans ,  Timothy J. McDonald ,  Kenneth Fisher ,  Sean Kissick

IPC: H01M8/04 ,  H01M8/04186 ,  H01M8/04276 ,  H01M8/18

Abstract: A method for a redox flow battery system may include flowing an electrolyte from an electrolyte storage tank to a multi-stage rebalancing reactor, the multi-stage rebalancing reactor comprising reactor vessels grouped to form stages. Hydrogen gas may be injected into the electrolyte upstream of the multi-stage rebalancing reactor via a gas line and a metal ion of the electrolyte may be chemically reduced by oxidizing the hydrogen gas at a catalyst bed of each of the reactor vessels to maintain a charge balance of the electrolyte and a pH of the electrolyte within a predetermined range.

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：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.