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    SYSTEMS AND METHODS FOR FLOWING, STORING, AND REBALANCING ELECTROLYTE IN REDOX FLOW BATTERY SYSTEM
    73.
    发明申请
    SYSTEMS AND METHODS FOR FLOWING, STORING, AND REBALANCING ELECTROLYTE IN REDOX FLOW BATTERY SYSTEM 有权

    公开(公告)号：US20230062739A1

    公开(公告)日：2023-03-02

    申请号：US17816316

    申请日：2022-07-29

    Applicant: ESS TECH, INC.

    Inventor： Yang Song ,  Craig Evans

    IPC: H01M8/18 ,  H01M8/2465 ,  H01M8/1016 ,  H01M8/0438

    Abstract: Systems and methods are provided for electrolyte distribution, rebalancing, and storage in a redox flow battery system. In one example, the redox flow battery system may include a plurality of redox flow battery cells and a plurality of storage tanks respectively fluidically coupled thereto, wherein a gauge pressure in each of the plurality of storage tanks may be maintained below a relatively low pressure (for example, below 2 psi). In some examples, the redox flow battery system may further include a plurality of rebalancing cells respectively fluidically coupled to the plurality of storage tanks, each of the plurality of rebalancing cells including a stack of internally shorted electrode assemblies. In this way, the redox flow battery system may be operated at less than the relatively low pressure, such that multiple space effective (for example, prismatic and relatively small) storage tanks may be included.

    METHODS AND SYSTEMS FOR PRETREATING BIPOLAR PLATE AND USE THEREOF IN REDOX FLOW BATTERY
    75.
    发明申请
    METHODS AND SYSTEMS FOR PRETREATING BIPOLAR PLATE AND USE THEREOF IN REDOX FLOW BATTERY 有权

    公开(公告)号：US20220278340A1

    公开(公告)日：2022-09-01

    申请号：US17650513

    申请日：2022-02-09

    Applicant: ESS Tech, Inc.

    Inventor： Yang Song ,  Yan Wu ,  Brady Thompson

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

    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.

    INTERNALLY MANIFOLDED FLOW CELL FOR AN ALL-IRON HYBRID FLOW BATTERY
    78.
    发明申请
    INTERNALLY MANIFOLDED FLOW CELL FOR AN ALL-IRON HYBRID FLOW BATTERY 有权

    公开(公告)号：US20220037751A1

    公开(公告)日：2022-02-03

    申请号：US17450970

    申请日：2021-10-14

    Applicant: ESS Tech, Inc.

    Inventor： Craig Evans ,  Yang Song

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

    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.

    ELECTRODE ASSEMBLY FOR A REDOX FLOW BATTERY
    80.
    发明申请
    ELECTRODE ASSEMBLY FOR A REDOX FLOW BATTERY 有权

    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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