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.

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：US20230361331A1

公开(公告)日：2023-11-09

申请号：US18352679

申请日：2023-07-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Brady Thompson ,  Timothy J. McDonald

IPC: H01M8/18 ,  H01M8/04537 ,  H01M8/04858 ,  H01M4/52

CPC classification number: H01M8/188 ,  H01M8/04604 ,  H01M8/04895 ,  H01M4/521

Abstract: Methods and systems are provided for iron preformation in a redox flow battery. In one example, a method may include, in a first condition, discharging and then charging the redox flow battery, and in a second condition, charging the redox flow battery including preforming iron metal at a negative electrode of the redox flow battery, and thereafter entering an idle mode of the redox flow battery including adjusting one or more electrolyte conditions. In some examples, each of preforming the iron metal and adjusting the one or more electrolyte conditions may increase a battery charge capacity to greater than a threshold battery charge capacity.

公开(公告)号：US11811110B2

公开(公告)日：2023-11-07

申请号：US18182892

申请日：2023-03-13

Applicant: ESS TECH, INC.

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

IPC: H01M8/04 ,  H01M8/04537 ,  H01M8/18 ,  H01M8/04955 ,  H01M8/04858

CPC classification number: H01M8/04611 ,  H01M8/04582 ,  H01M8/04932 ,  H01M8/04955 ,  H01M8/188

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：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：US20230216072A1

公开(公告)日：2023-07-06

申请号：US18182892

申请日：2023-03-13

Applicant: ESS TECH, INC.

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

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

CPC classification number: H01M8/04611 ,  H01M8/188 ,  H01M8/04932 ,  H01M8/04955 ,  H01M8/04582

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：US11631872B2

公开(公告)日：2023-04-18

申请号：US17099191

申请日：2020-11-16

Applicant: ESS TECH, INC.

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

IPC: H01M8/04 ,  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：US11201343B2

公开(公告)日：2021-12-14

申请号：US16684429

申请日：2019-11-14

Applicant: ESS TECH, INC.

Inventor： Yang Song ,  Timothy J. McDonald ,  Alexandria Behr

IPC: H01M8/06 ,  H01M8/18 ,  H01M8/0444 ,  H01M8/04746 ,  H01M8/04186

Abstract: Methods and systems are provided for a rebalancing reactor of a flow battery system. In one example, a pH of a battery electrolyte may be maintained by the rebalancing reactor by applying a negative potential to a catalyst bed of the rebalancing reactor. A performance of the rebalancing reactor may further be maintained by treating the catalyst bed with deionized water.