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    ENERGY STORAGE SYSTEM, AND DEVICE FOR CONTROLLING GROUND STRUCTURE OF ENERGY STORAGE SYSTEM
    1.
    发明公开
    ENERGY STORAGE SYSTEM, AND DEVICE FOR CONTROLLING GROUND STRUCTURE OF ENERGY STORAGE SYSTEM 审中-公开

    公开(公告)号：US20240364133A1

    公开(公告)日：2024-10-31

    申请号：US18692162

    申请日：2023-01-06

    Applicant: LG ENERGY SOLUTION, LTD.

    Inventor： Jongcheol KIM ,  Byeongho MUN ,  Inho JUNG

    IPC: H02J7/35 ,  G01R31/52 ,  H02J3/32

    CPC classification number: H02J7/35 ,  G01R31/52 ,  H02J3/32 ,  H02J2300/24

    Abstract: Discussed is an energy storage system connected with a power grid, and including a photovoltaic (PV) system; a power conversion system to be connected with the power grid and selectively connected to the photovoltaic system; a first switch to selectively connect the photovoltaic system and a direct current (DC) link of the power conversion system; a first ground fault detector including a terminal connected to a ground; a second switch selectively to connect the photovoltaic system and another terminal of the first ground fault detector; and a switch controller to change a ground structure of at least one of the photovoltaic system, the power conversion system, and a battery system included in the energy storage system and to selectively connect the photovoltaic system and the DC link, by controlling the first switch and the second switch based on a power generation state of the photovoltaic system.

    SHORT-CIRCUIT CURRENT PREDICTION DEVICE AND METHOD
    2.
    发明公开
    SHORT-CIRCUIT CURRENT PREDICTION DEVICE AND METHOD 审中-公开

    公开(公告)号：US20240151778A1

    公开(公告)日：2024-05-09

    申请号：US18282098

    申请日：2022-09-06

    Applicant: LG ENERGY SOLUTION, LTD.

    Inventor： Byeongho MUN ,  Sung Shik KONG ,  Hangjin CHO

    IPC: G01R31/3842 ,  G01R31/36 ,  G01R31/367 ,  H02J7/00

    CPC classification number: G01R31/3842 ,  G01R31/3648 ,  G01R31/367 ,  H02J7/00304

    Abstract: A short-circuit current prediction method includes deriving an internal equivalent circuit of a battery that reflects a short circuit condition in a direct current (DC) circuit, derive a first equivalent circuit in consideration of electrical characteristics of the battery, deriving a second equivalent circuit in consideration of electrical characteristics of a fuse, obtain a short-circuit current prediction model by reflecting the first equivalent circuit and the second equivalent circuit based on the internal equivalent circuit, and predict the short-circuit current according to a battery voltage using the short-circuit current prediction model. Thus, high-precision short-circuit current prediction is possible in units of battery modules, racks, and systems.

    BATTERY CONDITION MONITORING DEVICE AND METHOD, AND BATTERY PROTECTION DEVICE
    3.
    发明公开
    BATTERY CONDITION MONITORING DEVICE AND METHOD, AND BATTERY PROTECTION DEVICE 审中-公开

    公开(公告)号：US20240201268A1

    公开(公告)日：2024-06-20

    申请号：US18287273

    申请日：2022-10-11

    Applicant: LG ENERGY SOLUTION, LTD.

    Inventor： Sung Shik KONG ,  Minkyu KIM ,  Byeongho MUN

    IPC: G01R31/382 ,  H02H7/18

    CPC classification number: G01R31/382 ,  H02H7/18

    Abstract: A battery protection apparatus including a first current sensor connected to a positive terminal of a battery to measure a first current value; a second current sensor connected to a negative terminal of the battery to measure a second current value; a contactor including a first contactor positioned between the positive terminal of the battery and the first current sensor and a second contactor positioned between the negative terminal of the battery and the second current sensor; and a controller for setting a representative current value among the first current value and the second current value, and determining whether the representative current value is an abnormal current, and thus, it is possible to measure battery current stably even when one current sensor fails by measuring and monitoring current using heterogeneous current sensors, and protecting the battery from abnormal current based on the representative current value of the battery.

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