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公开(公告)号：US20230236251A1
公开(公告)日：2023-07-27
申请号：US18002288
申请日：2021-06-25
Inventor： SHINYA NISHIKAWA , TAKASHI IIDA , TOMOKAZU SADA
IPC: G01R31/367 , G01R31/3835
CPC classification number: G01R31/367 , G01R31/3835 , H01M2010/4278
Abstract: In an arithmetic system, a data acquisition unit acquires operation data at least including a voltage of a battery mounted on an identical product (for example, an electrically-driven vehicle of an identical vehicle type) and a state of charge (SOC) from a plurality of individuals of the product via a network. A detector statistically processes the plurality of pieces of acquired operation data to detect an individual on which a battery different from specifications of the product is mounted.
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公开(公告)号：US20210318386A1
公开(公告)日：2021-10-14
申请号：US17261101
申请日：2019-06-12
Inventor： YUSUKE ITAKURA , CHANGHUI YANG , SHINYA NISHIKAWA , TOHRU WATANABE
IPC: G01R31/388 , G01R31/392 , B60L58/20
Abstract: Provided is a controller configured: to calculate, among voltages detected from a plurality of cells, a voltage difference between the voltage detected from one cell of the plurality of cells, the one cell to be detected, and a representative voltage at each of a first time and a second time, the representative voltage based on the voltage detected from at least one cell of the plurality of cells, the at least one cell to be compared; and when a discrepancy between the voltage difference at the first time and the voltage difference at the second time is equal to or more than a threshold, to determine that an abnormality has occurred in the one cell to be detected. The controller refers to a state-of-charge versus open-circuit-voltage (SOC-OCV) curve of the one cell to be detected in accordance with a state-of-health (SOH) of the one cell to be detected, so as to estimate an SOC as initial capacitance reference of the one cell to be detected in correspondence to the voltage detected from the one cell to be detected. The controller introduces a linear function using an SOC as initial capacitance reference as an input variable, using an OCV as an output variable, and having a predetermined inclination, and applies the SOC as initial capacitance reference of the one cell to be detected that the controller has estimated to the linear function, so as to derive an OCV. Then, in place of the voltage detected from the one cell to be detected, the controller uses the OCV that the controller has derived, so as to calculate the voltage difference at the first time and the voltage difference at the second time.
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公开(公告)号：US20190181663A1
公开(公告)日：2019-06-13
申请号：US16275242
申请日：2019-02-13
Inventor： SHINYA NISHIKAWA , YUSUKE ITAKURA , TAKASHI IIDA
IPC: H02J7/00 , G01R31/396 , G01R31/3835
Abstract: A smoothing unit smooths a detected voltage of each power storage block based on previous data during a certain period. A calculator calculates a difference between a smoothing voltage of one power storage block in the n power storage blocks and a representative value of the smoothing voltages of the other power storage blocks or all the power storage blocks. A determination unit determines a power storage block whose difference against the representative value enlarges more than or equal to a set value during a predetermined period as a power storage block containing an abnormal power storage cell.
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公开(公告)号：US20250076403A1
公开(公告)日：2025-03-06
申请号：US18725861
申请日：2023-01-06
Inventor： MUTSUHIKO TAKEDA , SHINYA NISHIKAWA
IPC: G01R31/396 , B60L3/00 , G01R31/3842 , G01R31/52 , H01M4/58 , H01M10/0525 , H01M10/42 , H01M10/48
Abstract: A data acquirer acquires voltage data and current data of a plurality of cells in a battery pack including the plurality of cells connected in series, or voltage data and current data of a plurality of parallel cell blocks in a battery pack including the plurality of parallel cell blocks each including a plurality of cells connected in parallel. Based on the voltage data and the current data of each of the cells or each of the parallel cell blocks, a dV/dQ estimator estimates dV/dQ indicating a differential value of the voltage with respect to the capacity of each of the cells or each of the parallel cell blocks. A determiner determines whether or not a micro-short circuit has occurred in the battery pack based on a change in variation of characteristic points of dV/dQ between the plurality of cells or the plurality of parallel cell blocks.
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公开(公告)号：US20250020731A1
公开(公告)日：2025-01-16
申请号：US18711877
申请日：2022-11-01
Inventor： SHINYA NISHIKAWA , YUSUKE ITAKURA , MUTSUHIKO TAKEDA , TAKASHI IIDA
IPC: G01R31/396 , G01K1/02 , G01K3/14 , G01R31/3835 , G01R31/52
Abstract: A battery abnormality detection system includes the following constituents. A battery data acquisition unit acquires voltages of one of a plurality of cells and a plurality of parallel cell blocks in a battery pack and temperatures at a plurality of observation points respectively measured by a plurality of temperature sensors provided in the battery pack. A determination unit determines presence or absence of an abnormality in one of a specific cell and a specific parallel cell block, based on a transition of a voltage of the one of the specific cell and the specific parallel cell block in a predetermined period in the battery pack and on a difference between a temperature change at a first observation point and a temperature change at a second observation point in the predetermined period in the battery pack.
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Patent Agency Ranking
公开(公告)号：US20220026497A1
公开(公告)日：2022-01-27
申请号：US17311370
申请日：2019-11-13
Inventor： SHINYA NISHIKAWA , TAKASHI IIDA , TOHRU WATANABE
IPC: G01R31/3842 , G01R31/367 , G01R31/385 , H01M10/48 , G01R31/36 , H01M4/485
Abstract: A voltage of a battery cell is measured, and a current flowing through the battery cell is measured. An open circuit voltage (OCV) of the battery cell is estimated based on the measured voltage, the measured current, and an equivalent circuit model based on electrochemistry of the battery cell. At least one of a positive electrode and negative electrode of the battery cell is a mixed electrode containing a plurality of materials. The equivalent circuit model is a model including a diffusion resistance component for each of the plurality of materials for use in the positive electrode and the negative electrode.
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公开(公告)号：US20230065968A1
公开(公告)日：2023-03-02
申请号：US17759913
申请日：2020-12-28
Inventor： SHINYA NISHIKAWA , TOMOKAZU SADA , TAKASHI IIDA , MASAAKI TAKEGATA
IPC: G01R31/396 , G01R31/374 , G01R31/3828 , G01R31/387 , G01R31/392
Abstract: In a calculation system, a data acquisition unit is configured to acquire operation data of a battery, the operation data including at least voltages and currents measured by a management device at a plurality of time points, and states of charge (SOCs) estimated based on at least one of the voltages and the currents, the management device being configured to manage the battery. An extraction unit is configured to, extract, as sample data, a set of an SOC and a voltage from sets of the SOCs and the voltages the plurality of time points included in the operation data in a period in which the battery is regarded as resting, the period being specified based on the currents. An estimation unit is configured to estimate an SOC-open circuit voltage (OCV) characteristic of the battery based on the extracted sample data.
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公开(公告)号：US20220026498A1
公开(公告)日：2022-01-27
申请号：US17311373
申请日：2019-11-13
Inventor： SHINYA NISHIKAWA , TOHRU WATANABE , TAKASHI IIDA
IPC: G01R31/3842 , G01R31/367 , H02J7/00 , B60L58/12 , H01M10/48 , H01M10/44
Abstract: A voltage of a battery cell is measured, and a current flowing through the battery cell is measured. An open circuit voltage (OCV) of the battery cell is estimated based on the measured voltage, the measured current, and an equivalent circuit model based on electrochemistry of the battery cell, and a state of charge (SOC) of the battery cell is estimated based on the estimated OCV, SOC-OCV characteristics on a charge side of the battery cell, and SOC-OCV characteristics on a discharge side of the battery cell. At least one of a positive electrode and negative electrode of the battery cell is a mixed electrode containing a plurality of materials. Estimated is a current flowing through a material in which capacity-OCV characteristics are different between the charge side and the discharge side, the material being included in the plurality of materials contained in the mixed electrode, and a ratio between the SOC-OCV characteristics on the charge side and the SOC-OCV characteristics on the discharge side is determined based on the current.
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公开(公告)号：US20200169105A1
公开(公告)日：2020-05-28
申请号：US16617563
申请日：2018-04-26
Inventor： TOHRU WATANABE , KAZUFUMI NISHIKAWA , SHINYA NISHIKAWA
Abstract: In a power storage system, a management device calculates a state of power (SOP) of a whole of a plurality of power storage blocks connected in parallel based on an SOP of each of the plurality of power storage blocks to specify the calculated SOP of the whole for an upper limit level of power or current for at least one of charging and discharging controlled by a power converter. When at least one of a plurality of switches is turned off to disconnect at least one (30) of the plurality of power storage blocks, the management device calculates an SOP of a whole of the remaining power storage blocks based on a deviation in current between each of the remaining power storage blocks to determine an upper limit level of power or current flowing into the power converter.
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公开(公告)号：US20200161875A1
公开(公告)日：2020-05-21
申请号：US16617556
申请日：2018-04-26
Inventor： SHINYA NISHIKAWA , KAZUFUMI NISHIKAWA , TOHRU WATANABE
IPC: H02J7/00
Abstract: In a power storage system, a management device calculates a state of power (SOP) of a whole of a plurality of power storage blocks connected in parallel based on an SOP of each of the plurality of power storage blocks. At least one of the plurality of power storage blocks is disconnected from the power storage system, and when at least one switch is turned on to return at least one disconnected power storage block to the power storage system having the parallel-connected power storage blocks, the management device calculates an SOP of a whole of the power storage blocks after a return of the at least one power storage block based on a deviation in current between each of the power storage blocks including the at least one returned power storage block to determine an upper limit level of power or current flowing into a power converter.
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