公开(公告)号：US20230299318A1

公开(公告)日：2023-09-21

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: H01M8/04276 ,  H01M8/18 ,  H01M8/04186

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

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：US20230253584A1

公开(公告)日：2023-08-10

申请号：US18301935

申请日：2023-04-17

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 ,  H01M8/04298 ,  H01M8/188 ,  H01M8/04119

Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system includes a power module, an electrolyte pump, and a power control system. The power control system may include instructions to switch the redox flow battery system to an idle mode, activate an electrolyte pump when a first threshold period of time elapses, deactivate the electrolyte pump when a second threshold period of time elapses, and drain, purge, and refill one or more electrode compartments when a third threshold period of time elapses.

公开(公告)号：US20210143455A1

公开(公告)日：2021-05-13

申请号：US17081695

申请日：2020-10-27

Applicant: ESS TECH, INC.

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

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

Abstract: A rebalancing reactor for a redox flow battery system may include a plurality of reactor vessels arranged in stages, each vessel of the plurality of reactor vessels housing a catalyst bed. In one example, the rebalancing reactor is fluidly coupled to an electrolyte storage tank and configured to flow electrolyte through the plurality of reactor vessels, enabling a chemical rebalancing of electrolyte in the redox flow battery cell.

公开(公告)号：US11728497B2

公开(公告)日：2023-08-15

申请号：US17081695

申请日：2020-10-27

Applicant: ESS TECH, INC.

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

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

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

Abstract: A rebalancing reactor for a redox flow battery system may include a plurality of reactor vessels arranged in stages, each vessel of the plurality of reactor vessels housing a catalyst bed. In one example, the rebalancing reactor is fluidly coupled to an electrolyte storage tank and configured to flow electrolyte through the plurality of reactor vessels, enabling a chemical rebalancing of electrolyte in the redox flow battery cell.

公开(公告)号：US20230253583A1

公开(公告)日：2023-08-10

申请号：US18301927

申请日：2023-04-17

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 ,  H01M8/04298 ,  H01M8/188 ,  H01M8/04119

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, responsive to switching the redox flow battery system to an idle mode, initiating a first timer monitoring a first threshold period of time. An electrolyte pump may be activated when the first threshold period of time elapses, the electrolyte pump driving circulation of electrolytes through one or more electrode compartments.

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：US20210359315A1

公开(公告)日：2021-11-18

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 ,  H01M8/04119 ,  H01M8/18 ,  H01M8/04298

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.