Patents by Inventor Masahiko Mitsui

Masahiko Mitsui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220397611
    Abstract: A battery capacity estimation system executes a charging and discharging process (S1), an alternating current impedance acquiring process (S2 and S3), and a battery capacity estimating process (S4 to S6). The charging and discharging process involves charging and discharging a target secondary battery. The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, by applying an alternating current signal within a specific frequency range to the target secondary battery after completion of the charging and discharging in the charging and discharging process and before a predetermined maximum waiting time elapses. The battery capacity estimating step involves estimating a battery capacity of the target secondary battery based on the measurement result of the alternating current impedance.
    Type: Application
    Filed: August 23, 2022
    Publication date: December 15, 2022
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiko Mitsui, Junta Izumi, Juni Yasoshima
  • Patent number: 11480618
    Abstract: A battery capacity estimation system executes a charging and discharging process (S1), an alternating current impedance acquiring process (S2 and S3), and a battery capacity estimating process (S4 to S6). The charging and discharging process involves charging and discharging a target secondary battery. The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, by applying an alternating current signal within a specific frequency range to the target secondary battery after completion of the charging and discharging in the charging and discharging process and before a predetermined maximum waiting time elapses. The battery capacity estimating step involves estimating a battery capacity of the target secondary battery based on the measurement result of the alternating current impedance.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: October 25, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko Mitsui, Junta Izumi, Juni Yasoshima
  • Publication number: 20220311250
    Abstract: A control device classifies a plurality of batteries included in a battery string into a first battery (e.g., Ni-MH) and a second battery (e.g., LiB). When a predetermined first condition is satisfied, the control device connects, to a power supply circuit, only the first battery among the batteries included in the battery string. When a predetermined second condition is satisfied, the control device connects, to the power supply circuit, only the second battery among the batteries included in the battery string.
    Type: Application
    Filed: March 16, 2022
    Publication date: September 29, 2022
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Masahiko Mitsui
  • Patent number: 11366168
    Abstract: An analysis device determines, by the Maharanobis-Taguchi system using a plurality of explanatory variables, to which of a first group and a second group a module representing a nickel metal hydride battery will belong when the module is subjected to capacity restoration processing, the first group being defined as a group of modules of which battery capacity is lower than a reference capacity, the second group being defined as a group of modules of which battery capacity is higher than a reference capacity. The plurality of explanatory variables include a plurality of feature values extracted from a Nyquist plot of the module. The plurality of feature values include at least two AC impedance real number components plotted in a semicircular portion, at least two AC impedance imaginary number components plotted in the semicircular portion, and at least one AC impedance imaginary number component plotted in a linear portion.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: June 21, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko Mitsui, Junta Izumi
  • Patent number: 11327118
    Abstract: A battery capacity estimation method includes first to third steps. The first step involves obtaining information about a Nyquist plot by a predetermined AC-IR measurement. The second step involves obtaining image data of a Nyquist diagram that is obtained when the AC-IR measurement is performed at a predetermined first temperature, based on the information about the Nyquist plot obtained in the first step and on an ambient temperature at which the AC-IR measurement is performed in the first step. The third step involves inputting the image data of the Nyquist diagram obtained in the second step to an input layer of a pre-trained neural network model, to obtain a battery capacity estimate value of a battery to be measured.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: May 10, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junta Izumi, Masahiko Mitsui, Juni Yasoshima
  • Publication number: 20220120818
    Abstract: A battery capacity estimation system executes a charging and discharging process (S1), an alternating current impedance acquiring process (S2 and S3), and a battery capacity estimating process (S4 to S6). The charging and discharging process involves charging and discharging a target secondary battery. The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, by applying an alternating current signal within a specific frequency range to the target secondary battery after completion of the charging and discharging in the charging and discharging process and before a predetermined maximum waiting time elapses. The battery capacity estimating step involves estimating a battery capacity of the target secondary battery based on the measurement result of the alternating current impedance.
    Type: Application
    Filed: December 23, 2021
    Publication date: April 21, 2022
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko MITSUI, Junta IZUMI, Juni YASOSHIMA
  • Patent number: 11307257
    Abstract: A trained neural network model is a neural network model which has been trained based on Nyquist plots of a plurality of modules of which full charge capacity is within a reference range. A processing system determines to which of a first group of modules of which full charge capacity is within the reference range and a second group of modules of which full charge capacity is out of the reference range a module belongs, based on discriminant analysis in which at least one feature value extracted from the Nyquist plot of the module is adopted as an explanatory variable. When the processing system determines that the module M belongs to the first group, the processing system estimates a full charge capacity of the module by using the trained neural network model.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: April 19, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junta Izumi, Masahiko Mitsui, Juni Yasoshima, Kotaro Shibuya
  • Patent number: 11221372
    Abstract: A battery performance evaluation device executes an alternating current impedance acquiring process (S1), an OCV acquiring process (S2), and an SOC estimating process (S3). The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, the alternating current impedance measured by applying an application signal to the target secondary battery within a specific frequency range. The OCV acquiring process involves acquiring an OCV of the target secondary battery. The SOC estimating process involves estimating an SOC of the target secondary battery to be 0%, if an imaginary component of the measurement result of the acquired alternating current impedance at a predetermined frequency within the specific frequency range is greater than or equal to a first threshold value and the acquired OCV value is less than or equal to a second threshold value.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: January 11, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko Mitsui, Junta Izumi, Juni Yasoshima
  • Patent number: 11215671
    Abstract: A battery information processing system includes a storage device configured to store an equivalent circuit model which expresses an AC impedance of a battery module with a plurality of circuit constants. The plurality of circuit constants include first to eighth circuit constants. The first circuit constant is a junction inductance. The second circuit constant is a junction resistance. The third circuit constant is a solution resistance and the fourth circuit constant is a charge transfer resistance. The fifth circuit constant is a CPE index of a diffusion resistance. The sixth circuit constant is a CPE constant of the diffusion resistance. The seventh circuit constant is a CPE index of an electric double layer capacitance. The eighth circuit constant is a CPE constant of the electric double layer capacitance.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: January 4, 2022
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuya Kodama, Masahiko Mitsui
  • Patent number: 11175344
    Abstract: A battery information processing system includes a storage device configured to store an equivalent circuit model which expresses an AC impedance of a battery module with a plurality of circuit constants. The plurality of circuit constants include first to eighth circuit constants. The first circuit constant is a junction inductance. The second circuit constant is a junction resistance. The third circuit constant is a solution resistance and the fourth circuit constant is a charge transfer resistance. The fifth circuit constant is a CPE index of a diffusion resistance. The sixth circuit constant is a CPE constant of the diffusion resistance. The seventh circuit constant is a CPE index of an electric double layer capacitance. The eighth circuit constant is a CPE constant of the electric double layer capacitance.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: November 16, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuya Kodama, Masahiko Mitsui
  • Patent number: 11143706
    Abstract: A battery capacity estimation method includes a first step and a second step. The first step is a step of obtaining image data of a Nyquist diagram drawn by a predetermined method, based on a Nyquist plot obtained by a predetermined AC-IR measurement. The second step is a step of obtaining a battery capacity estimate value of a battery to be measured by inputting the image data of the Nyquist diagram obtained in the first step into an input layer of a pre-trained neural network model.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: October 12, 2021
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junta Izumi, Masahiko Mitsui, Juni Yasoshima
  • Patent number: 11139461
    Abstract: A method for manufacturing a nickel-metal hydride battery includes: a first step of preparing a first nickel-metal hydride battery having a positive electrode including nickel hydroxide (Ni(OH)2); and a second step of manufacturing the second nickel-metal hydride battery by performing 600% overcharging to the prepared first nickel-metal hydride battery. The 600% overcharging is a process for supplying the first nickel-metal hydride battery with an amount of electric power of 600% of the rated capacity of the first nickel-metal hydride battery.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: October 5, 2021
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiko Mitsui, Junta Izumi, Kenji Takahashi, Hiroyuki Kaiya
  • Patent number: 10923781
    Abstract: A recovering device includes a charging chamber configured to overcharge a nickel-metal hydride battery. The charging chamber is provided with: a first water bath; a fixing device configured to fix the nickel-metal hydride battery with a portion of a container of the nickel-metal hydride battery being immersed in the water coolant in the first water bath; a pump; a dial gauge configured to detect a deformation amount of the container of the nickel-metal hydride battery; and a collection container configured to collect the gas exhausted from the exhaust valve of the nickel-metal hydride battery and exhaust the gas to outside the recovering device. The recovering device further includes a controller configured to perform the overcharging process for the nickel-metal hydride battery. The controller is configured to halt the overcharging process when the deformation amount of the container exceeds a threshold value.
    Type: Grant
    Filed: December 18, 2018
    Date of Patent: February 16, 2021
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Masahiko Mitsui, Junta Izumi, Kazuya Kodama, Kenji Kimura
  • Publication number: 20200209319
    Abstract: A battery performance evaluation device executes an alternating current impedance acquiring process (S1), an OCV acquiring process (S2), and an SOC estimating process (S3). The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, the alternating current impedance measured by applying an application signal to the target secondary battery within a specific frequency range. The OCV acquiring process involves acquiring an OCV of the target secondary battery. The SOC estimating process involves estimating an SOC of the target secondary battery to be 0%, if an imaginary component of the measurement result of the acquired alternating current impedance at a predetermined frequency within the specific frequency range is greater than or equal to a first threshold value and the acquired OCV value is less than or equal to a second threshold value.
    Type: Application
    Filed: December 20, 2019
    Publication date: July 2, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko MITSUI, Junta Izumi, Juni Yasoshima
  • Publication number: 20200209320
    Abstract: A battery capacity estimation system executes a charging and discharging process (S1), an alternating current impedance acquiring process (S2 and S3), and a battery capacity estimating process (S4 to S6). The charging and discharging process involves charging and discharging a target secondary battery. The alternating current impedance acquiring process involves acquiring a measurement result of an alternating current impedance of a target secondary battery, by applying an alternating current signal within a specific frequency range to the target secondary battery after completion of the charging and discharging in the charging and discharging process and before a predetermined maximum waiting time elapses. The battery capacity estimating step involves estimating a battery capacity of the target secondary battery based on the measurement result of the alternating current impedance.
    Type: Application
    Filed: December 20, 2019
    Publication date: July 2, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko MITSUI, Junta IZUMI, Juni YASOSHIMA
  • Publication number: 20200200825
    Abstract: A battery capacity estimation method includes first to third steps. The first step involves obtaining information about a Nyquist plot by a predetermined AC-IR measurement. The second step involves obtaining image data of a Nyquist diagram that is obtained when the AC-IR measurement is performed at a predetermined first temperature, based on the information about the Nyquist plot obtained in the first step and on an ambient temperature at which the AC-IR measurement is performed in the first step. The third step involves inputting the image data of the Nyquist diagram obtained in the second step to an input layer of a pre-trained neural network model, to obtain a battery capacity estimate value of a battery to be measured.
    Type: Application
    Filed: December 18, 2019
    Publication date: June 25, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junta IZUMI, Masahiko MITSUI, Juni YASOSHIMA
  • Publication number: 20200200826
    Abstract: A battery capacity estimation method includes a first step and a second step. The first step is a step of obtaining image data of a Nyquist diagram drawn by a predetermined method, based on a Nyquist plot obtained by a predetermined AC-IR measurement. The second step is a step of obtaining a battery capacity estimate value of a battery to be measured by inputting the image data of the Nyquist diagram obtained in the first step into an input layer of a pre-trained neural network model.
    Type: Application
    Filed: December 18, 2019
    Publication date: June 25, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junta IZUMI, Masahiko MITSUI, Juni YASOSHIMA
  • Patent number: 10605871
    Abstract: A method for determining a state of a rechargeable battery includes obtaining a complex impedance measured by applying AC voltage or AC current to a rechargeable battery that is subject to determination and determining a state of the rechargeable battery based on the obtained complex impedance. The determining a state of the rechargeable battery includes determining whether or not a first capacity shift is occurring based on a comparison of a value of the complex impedance at a predetermined frequency with a first determination value used to determine a negative electrode capacity shift, and when determined that the first capacity shift is not occurring, determining whether or not a second capacity shift is occurring based on a comparison of a gradient of the complex impedance with respect to a real axis in a diffusion resistance region with a second determination value used to determine a positive electrode capacity shift.
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: March 31, 2020
    Assignees: PRIMEARTH EV ENERGY CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroshi Matsuno, Shinichiro Ito, Yasushi Nakagiri, Daisuke Koba, Tamotsu Fukuma, Junta Izumi, Kazuya Kodama, Masahiko Mitsui
  • Publication number: 20200049771
    Abstract: An analysis device determines, by the Maharanobis-Taguchi system using a plurality of explanatory variables, to which of a first group and a second group a module representing a nickel metal hydride battery will belong when the module is subjected to capacity restoration processing, the first group being defined as a group of modules of which battery capacity is lower than a reference capacity, the second group being defined as a group of modules of which battery capacity is higher than a reference capacity. The plurality of explanatory variables include a plurality of feature values extracted from a Nyquist plot of the module. The plurality of feature values include at least two AC impedance real number components plotted in a semicircular portion, at least two AC impedance imaginary number components plotted in the semicircular portion, and at least one AC impedance imaginary number component plotted in a linear portion.
    Type: Application
    Filed: July 22, 2019
    Publication date: February 13, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masahiko MITSUI, Junta Izumi
  • Publication number: 20200041570
    Abstract: A trained neural network model is a neural network model which has been trained based on Nyquist plots of a plurality of modules of which full charge capacity is within a reference range. A processing system determines to which of a first group of modules of which full charge capacity is within the reference range and a second group of modules of which full charge capacity is out of the reference range a module belongs, based on discriminant analysis in which at least one feature value extracted from the Nyquist plot of the module is adopted as an explanatory variable. When the processing system determines that the module M belongs to the first group, the processing system estimates a full charge capacity of the module by using the trained neural network model.
    Type: Application
    Filed: July 23, 2019
    Publication date: February 6, 2020
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Junta IZUMI, Masahiko MITSUI, Juni YASOSHIMA, Kotaro SHIBUYA