公开(公告)号：US10680263B2

公开(公告)日：2020-06-09

申请号：US15965709

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Evan Doremus ,  Thiago Groberg

IPC: H01M8/18 ,  H01M8/04746 ,  H01M8/04537 ,  H01M8/04082 ,  H01M8/04186

Abstract: A method of operating a redox flow battery, may include maintaining a positive electrode compartment pressure greater than a negative electrode compartment pressure, and maintaining a cross-over pressure less than a membrane break-through pressure, wherein the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure. In this way, ionic resistance across the separator can be maintained at a lower level by reducing gas bubbles trapped therein while reducing separator break-through, thereby increasing performance of the redox flow battery system.

公开(公告)号：US20180316031A1

公开(公告)日：2018-11-01

申请号：US15965673

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Evan Doremus

IPC: H01M8/04746 ,  H01M8/18 ,  H01M8/2455 ,  H01M8/043 ,  H01M8/04082

Abstract: Systems and methods for operating a redox flow battery system may include switching the redox flow battery system to an idle mode, wherein the idle mode includes operation of the redox flow battery system outside of a charging mode and outside of a discharge mode; in response to switching to the idle mode, repeatedly cycling operation of an electrolyte pump between an idling threshold flow rate less than a charging threshold flow rate and a deactivation threshold flow rate; and in response to switching to the charging mode, maintaining operation of the electrolyte pump at the charging threshold flow rate greater than the idling threshold flow rate. In this way, a responsiveness of the redox flow battery system to charging and discharging commands can be maintained while in idle, while reducing parasitic pumping losses due to pumping and heating, and reducing shunt current losses.

公开(公告)号：US11233257B2

公开(公告)日：2022-01-25

申请号：US15965673

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Evan Doremus

IPC: H01M8/04746 ,  H01M8/18 ,  H01M8/04082 ,  H01M8/043 ,  H01M8/2455

Abstract: Systems and methods for operating a redox flow battery system may include switching the redox flow battery system to an idle mode, wherein the idle mode includes operation of the redox flow battery system outside of a charging mode and outside of a discharge mode; in response to switching to the idle mode, repeatedly cycling operation of an electrolyte pump between an idling threshold flow rate less than a charging threshold flow rate and a deactivation threshold flow rate; and in response to switching to the charging mode, maintaining operation of the electrolyte pump at the charging threshold flow rate greater than the idling threshold flow rate. In this way, a responsiveness of the redox flow battery system to charging and discharging commands can be maintained while in idle, while reducing parasitic pumping losses due to pumping and heating, and reducing shunt current losses.

公开(公告)号：US20180316032A1

公开(公告)日：2018-11-01

申请号：US15965709

申请日：2018-04-27

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Evan Doremus ,  Thiago Groberg

IPC: H01M8/04746 ,  H01M8/18 ,  H01M8/04082 ,  H01M8/04537

Abstract: A method of operating a redox flow battery, may include maintaining a positive electrode compartment pressure greater than a negative electrode compartment pressure, and maintaining a cross-over pressure less than a membrane break-through pressure, wherein the cross-over pressure equals the negative electrode compartment pressure subtracted from the positive electrode compartment pressure. In this way, ionic resistance across the separator can be maintained at a lower level by reducing gas bubbles trapped therein while reducing separator break-through, thereby increasing performance of the redox flow battery system.