Cost-efficient high energy density redox flow battery

    公开(公告)号:US12283730B2

    公开(公告)日:2025-04-22

    申请号:US17229719

    申请日:2021-04-13

    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.

    NON-CONTACT LIQUID LEVEL SENSOR
    74.
    发明公开

    公开(公告)号:US20240151572A1

    公开(公告)日:2024-05-09

    申请号:US18481083

    申请日:2023-10-04

    Applicant: ESS TECH, INC.

    Inventor: Joseph M. Cooley

    Abstract: Systems and methods are provided for a non-contact level sensor system for a liquid tank. The non-contact level sensor system includes a non-contact level sensor positioned above a maximum level of liquid in the liquid tank, a float configured to float on a surface of the liquid and reflect and/or scatter energy emitted by the non-contact level sensor. The position of the float in a plane perpendicular to the energy emitted by the non-contact level sensor is confined within a housing, and the vertical distance between the float and the non-contact level sensor is related to an amount of liquid inside the liquid tank.

    Method and system for redox flow battery performance recovery

    公开(公告)号:US11929534B2

    公开(公告)日:2024-03-12

    申请号:US17070852

    申请日:2020-10-14

    Applicant: ESS TECH, INC.

    CPC classification number: H01M8/188

    Abstract: A method for a redox flow battery may include, interrupting cycling of the redox flow battery, including charging the redox flow battery to a threshold charge condition, draining positive and negative electrolyte from the redox flow battery, circulating a wash solution through the redox flow battery, and returning the positive and negative electrolyte to the redox flow battery, and resuming cycling of the redox flow battery. In this way, contamination of the redox flow battery system can be reduced, thereby prolonging the life and increasing performance of the redox flow battery system.

    ALTERNATIVE LOW COST ELECTRODES FOR HYBRID FLOW BATTERIES

    公开(公告)号:US20240047707A1

    公开(公告)日:2024-02-08

    申请号:US18486073

    申请日:2023-10-12

    Applicant: ESS TECH, INC.

    Abstract: A redox flow battery may include: a membrane interposed between a first electrode positioned at a first side of the membrane and a second electrode positioned at a second side of the membrane opposite to the first side; a first flow field plate comprising a plurality of positive flow field ribs, each of the plurality of positive flow field ribs contacting the first electrode at first supporting regions on the first side; and the second electrode, including an electrode spacer positioned between the membrane and a second flow field plate, the electrode spacer comprising a plurality of main ribs, each of the plurality of main ribs contacting the second flow field plate at second supporting regions on the second side, each of the second supporting regions aligned opposite to one of the plurality of first supporting regions. As such, a current density distribution at a plating surface may be reduced.

    Methods and systems for pretreating bipolar plate and use thereof in redox flow battery

    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.

    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
    79.
    发明公开

    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.

    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.

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