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公开(公告)号：US11228052B2
公开(公告)日：2022-01-18
申请号：US15965627
申请日：2018-04-27
Applicant: ESS TECH, INC.
Inventor： Yang Song , Kenneth Kiyoshi Fisher , Timothy McDonald
IPC: H01M8/18 , H01M8/04082 , H01M8/04089 , H01M8/04007 , H01M8/2455 , H01M8/0202 , H01M8/0289 , H01M8/2484
Abstract: A multi-chambered electrolyte storage tank for a redox flow battery system, may include first and second electrolyte chambers, and a bulkhead, wherein the first and second electrolyte chambers are fluidly coupled to first and second sides of a redox flow battery cell, respectively, the first and second electrolyte chambers include first and second liquid electrolyte volumes, respectively, and the first and second liquid electrolyte volumes are separated by the bulkhead positioned therebetween. In this way, manufacturing and operational complexity of a redox flow battery system can be reduced.
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公开(公告)号：US20210359332A1
公开(公告)日：2021-11-18
申请号：US17308913
申请日：2021-05-05
Applicant: ESS Tech, Inc.
Inventor： Sean Casey , Craig Evans , Thiago Groberg , Yang Song
IPC: H01M8/248 , H01M8/18 , H01M8/0247
Abstract: Methods and systems are provided for a redox flow battery system. In one example, the redox flow battery system includes a cell stack compressed between terminal structures defining ends of the redox flow battery. The cell stack may be formed of a plurality of cells where each cell includes a deformable positive electrode in contact with a first face of a membrane separator and a negative electrode configured to be less compressible than the positive electrode and arranged at a second face of the membrane separator.
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公开(公告)号：US20210135270A1
公开(公告)日：2021-05-06
申请号：US17080702
申请日：2020-10-26
Applicant: ESS TECH, INC.
Inventor： Yang Song , Brady Thompson , Timothy J. McDonald
IPC: H01M8/18 , H01M4/52 , H01M8/04858 , H01M8/04537
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.
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公开(公告)号：US10811993B2
公开(公告)日：2020-10-20
申请号：US15844250
申请日：2017-12-15
Applicant: ESS TECH, INC.
Inventor： Aaron Vanderzaden
Abstract: Systems and methods for operating a power conversion system that includes a sole DC/DC converter are described. The systems and methods reduce a total number of DC/DC converters in a power system that includes an electric energy storage device and a photovoltaic array. The system and method provide for transferring electrical charge from the photovoltaic array and the electric energy storage device to an alternating current stationary electrical grid via a DC bus and an inverter.
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公开(公告)号：US20200052317A1
公开(公告)日：2020-02-13
申请号：US16536213
申请日：2019-08-08
Applicant: ESS TECH, INC.
Inventor： Yang Song
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.
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Patent Agency Ranking
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.
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公开(公告)号：US09865895B2
公开(公告)日：2018-01-09
申请号：US14201244
申请日：2014-03-07
Applicant: ESS TECH, INC.
Inventor： Craig E. Evans , Yang Song
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.
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公开(公告)号：US09806366B2
公开(公告)日：2017-10-31
申请号：US15297011
申请日：2016-10-18
Applicant: ESS TECH, INC.
Inventor： Yang Song , Craig E. Evans
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.
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公开(公告)号：US20170200936A1
公开(公告)日：2017-07-13
申请号：US15476795
申请日：2017-03-31
Applicant: ESS TECH, INC.
Inventor： Craig Evans , Yang Song
IPC: H01M2/36 , H01M8/20 , H01M8/04186 , H01M8/18
CPC classification number: H01M2/362 , H01M2/361 , H01M8/04186 , H01M8/188 , H01M8/20 , Y02E60/528 , Y10T137/4757
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.
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公开(公告)号：US09685651B2
公开(公告)日：2017-06-20
申请号：US14019491
申请日：2013-09-05
Applicant: ESS TECH, INC.
Inventor： Craig Evans , Yang Song
CPC classification number: H01M2/362 , H01M2/361 , H01M8/04186 , H01M8/188 , H01M8/20 , Y02E60/528 , Y10T137/4757
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.
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