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    Methods and systems for pretreating bipolar plate and use thereof in redox flow battery
    121.
    发明授权
    Methods and systems for pretreating bipolar plate and use thereof in redox flow battery 有权

    公开(公告)号：US11764369B2

    公开(公告)日：2023-09-19

    申请号：US17650513

    申请日：2022-02-09

    Applicant: ESS Tech, Inc.

    Inventor： Yang Song ,  Yan Wu ,  Brady Thompson

    IPC: H01M8/0247 ,  H01M8/0228 ,  H01M8/18

    CPC classification number: H01M8/0247 ,  H01M8/0228 ,  H01M8/188

    Abstract: Systems and methods are provided for electrochemical and/or chemical pretreatment of bipolar plates, for example, for plating electrodes in redox flow batteries. In one example, a method may include pretreating a bipolar plate for the redox flow battery by disrupting a surface of the bipolar plate. In some examples, pretreating the bipolar plate may include positioning the bipolar plate within the redox flow battery, and thereafter charging the redox flow battery at multiple discrete plating current densities for each of one or more initial charging cycles to electrochemically etch the surface. In additional or alternative examples, pretreating the bipolar plate may include soaking the bipolar plate in solution to chemically treat the surface. In this way, the bipolar plate may be pretreated via electrochemical etching and/or chemical treatment so as to reduce electrochemical performance losses and dendrite formation in the redox flow battery.

    REDOX FLOW BATTERY AND BATTERY SYSTEM
    122.
    发明公开
    REDOX FLOW BATTERY AND BATTERY SYSTEM 审中-公开

    公开(公告)号：US20230282862A1

    公开(公告)日：2023-09-07

    申请号：US18316977

    申请日：2023-05-12

    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.

    ELECTRODE ASSEMBLY FOR A REDOX FLOW BATTERY
    123.
    发明公开
    ELECTRODE ASSEMBLY FOR A REDOX FLOW BATTERY 审中-公开

    公开(公告)号：US20230261238A1

    公开(公告)日：2023-08-17

    申请号：US18296170

    申请日：2023-04-05

    Applicant: ESS TECH, INC.

    Inventor： Sean Casey ,  Craig Evans ,  Thiago Groberg ,  Yang Song

    IPC: H01M8/248 ,  H01M8/0247 ,  H01M8/18

    CPC classification number: H01M8/248 ,  H01M8/0247 ,  H01M8/188

    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.

    Internally manifolded flow cell for an all-iron hybrid flow battery
    127.
    发明授权
    Internally manifolded flow cell for an all-iron hybrid flow battery 有权

    公开(公告)号：US11715840B2

    公开(公告)日：2023-08-01

    申请号：US17450970

    申请日：2021-10-14

    Applicant: ESS Tech, Inc.

    Inventor： Craig Evans ,  Yang Song

    IPC: H01M8/18 ,  H01M8/20 ,  H01M50/60 ,  H01M8/04186

    CPC classification number: H01M8/188 ,  H01M8/04186 ,  H01M8/20 ,  H01M50/60 ,  Y02E60/50 ,  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.

    Redox flow battery and battery system
    128.
    发明授权
    Redox flow battery and battery system 有权

    公开(公告)号：US11502321B2

    公开(公告)日：2022-11-15

    申请号：US17308843

    申请日：2021-05-05

    Applicant: ESS Tech, Inc.

    Inventor： Sean Casey ,  Craig Evans ,  Thiago Groberg ,  Yang Song

    IPC: H01M8/18 ,  H01M8/0438

    Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a set of pressure plates having a first pressure plate at a first terminal end and a second pressure plate at a second terminal end, the second terminal end and the first terminal end positioned on opposing longitudinal sides of the redox flow battery. The redox flow battery further includes a first cell stack positioned longitudinally between the first pressure plate and the second pressure plate, each of the first and second pressure plates includes a plurality stacking detents on a first flange and a plurality of stacking protrusions on a second flange, and the first flange and the second flange arranged on opposing vertical sides of the redox flow battery.

    Methods and system for a battery
    129.
    发明授权
    Methods and system for a battery 有权

    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.

    REDOX FLOW BATTERY AND BATTERY SYSTEM
    130.
    发明申请
    REDOX FLOW BATTERY AND BATTERY SYSTEM 有权

    公开(公告)号：US20210359329A1

    公开(公告)日：2021-11-18

    申请号：US17308873

    申请日：2021-05-05

    Applicant: ESS Tech, Inc.

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

    IPC: H01M8/18 ,  H01M8/248 ,  H01M8/242 ,  H01M8/0247

    Abstract: A redox flow battery and battery system are provided. In one example, the redox flow battery includes a cell stack assembly having a plate assembly positioned on a lateral side of the cell stack assembly and comprising an elastic flange including a recess mated with a section of a conductive plate and compliant in at least one of a lateral direction and a vertical direction, and a plate frame coupled to the elastic flange.

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