Patents by Inventor Kohei HONKURA
Kohei HONKURA 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).
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Publication number: 20230204675Abstract: A method for diagnosing a battery pack having a configuration in which a plurality of cells are connected in series uses a system for obtaining detected data including the current and temperature of the battery pack and the voltage of each cell. An electric charge capacity and a state of charge (SOC) of each cell is calculated using the current and the temperature, the voltage of each cell, an open circuit voltage (OCV)-SOC function, and an OCV-resistance table. An amount of unbalance, which is an estimated value of the SOC, and the resistance for each cell when the battery pack is fully charged is calculated; and the energy capacity of the battery pack using the electric charge capacity, the amount of unbalance, and the resistances are calculated. As a result, the energy capacity of the battery pack can be calculated accurately, even in an unbalanced state.Type: ApplicationFiled: July 20, 2021Publication date: June 29, 2023Inventors: Takeshi INOUE, Shigeki HIRASAWA, Tetsuya ISHIMARU, Kohei HONKURA, Shigeki MAKINO, Jun KAWAJI
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Publication number: 20220236329Abstract: A battery controller is designed to: estimate a state of health of a battery/batteries on the basis of battery data including a relation between a DC resistance component and a state of charge and a relation between a polarization resistance component and the state of charge; and controls the battery/batteries by referring to the battery data and extracting the relation between the DC resistance component and the state of charge and the relation between the polarization resistance component and the state of charge on the basis of the estimated current state of health of the battery/batteries.Type: ApplicationFiled: June 4, 2020Publication date: July 28, 2022Applicant: Vehicle Energy Japan Inc.Inventors: Kohei HONKURA, Kei SAKABE
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Patent number: 10700389Abstract: A battery control device capable of controlling the deterioration speed of the characteristics of a secondary battery on the basis of the internal resistances of the positive and negative electrodes. The battery control device comprises: a storage unit for holding beforehand a data table DT2 indicating the rate of increase in the resistance of the positive and negative electrodes; and a DT1 calculation unit calculating a data table DT1 representing the correlations among the temperature, the battery state-of-charge and the upper limit current, and the correlations among the temperature, the battery state-of-charge and the lower limit current on the basis of DT2, a positive electrode state-of-charge, a negative electrode state-of-charge, a battery state-of-charge, and an allowed range for the rate of increase in the battery resistance. The battery control device controls the current of the secondary battery on the basis of DT1 calculated by the DT1 calculation unit.Type: GrantFiled: June 22, 2016Date of Patent: June 30, 2020Assignee: HITACHI, LTD.Inventor: Kohei Honkura
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Publication number: 20190386511Abstract: A power management system is provided with: a power supply facility equipped with an electricity storage unit; a user facility using stored power; and an integrated control device for controlling the supply of the stored power on the basis of stored-power use request information from the user facility. The power supply facility specifies the available capacity and time zone of the electricity storage unit to the integrated control device. The user facility specifies, to the integrated control device, a use request amount and a use request time zone when using the stored power. The integrated control device controls the use of the electricity storage unit so as to satisfy the use request amount and the use request time zone specified by the user and the available capacity and time zone specified by the provider.Type: ApplicationFiled: November 28, 2017Publication date: December 19, 2019Inventors: Hirofumi TAKAHASHI, Youhei KAWAHARA, Kohei HONKURA, Masatoshi SUGIMASA, Shinsuke ANDOU
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Patent number: 10483779Abstract: To accurately determine a deterioration state of a secondary battery with respect to a practical current value. Provided are a state determination device of a secondary battery, a state determination method of a secondary battery, a secondary battery system, and a charge and discharge control apparatus having the state determination device. In the state determination device of the secondary battery having a positive electrode and a negative electrode, a capacity reduction parameter group A is determined based on charge and discharge characteristics per reference quantity of the positive electrode and the negative electrode and a current value A, and a resistance increase parameter group B is determined based on the charge and discharge characteristics per reference quantity of the positive electrode and the negative electrode, the capacity reduction parameter group A, and a current value B which is larger than the current value A.Type: GrantFiled: September 25, 2013Date of Patent: November 19, 2019Assignee: HITACHI, LTD.Inventors: Kohei Honkura, Yutaka Okuyama
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Patent number: 10418827Abstract: An electricity storage system includes: a plurality of rechargeable batteries connected in parallel; and a control unit that controls the rechargeable batteries. The control unit detects a deactivation target rechargeable battery of which charge or discharge need to be deactivated, of the rechargeable batteries, electrically separates and deactivates the deactivation target rechargeable battery from a load in a case where a charging rate of the deactivation target rechargeable battery is lower than a predetermined charging rate, and performs control such that a temperature of the deactivated rechargeable battery is within a predetermined temperature range. In this manner, it is possible to disperse ions inside a battery such that it is possible to recover performance of the battery.Type: GrantFiled: December 27, 2016Date of Patent: September 17, 2019Assignee: Hitachi, Ltd.Inventors: Seogchul Shin, Kohei Honkura, Takashi Kamijoh, Yuuji Nagashima
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Patent number: 10224731Abstract: A positive electrode potential and a negative electrode potential during charge or discharge of a secondary battery are determined, based on potentials of a positive electrode and a negative electrode in an open circuit state corresponding to a SOC of the secondary battery, and internal resistances of the positive electrode and the negative electrode corresponding to the SOC of the secondary battery, and a current of the secondary battery is controlled such that the positive electrode potential and the negative electrode potential fall within a predetermined range.Type: GrantFiled: October 15, 2015Date of Patent: March 5, 2019Assignee: Hitachi, Ltd.Inventor: Kohei Honkura
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Publication number: 20180219263Abstract: A battery control device capable of controlling the deterioration speed of the characteristics of a secondary battery on the basis of the internal resistances of the positive and negative electrodes. The battery control device comprises: a storage unit for holding beforehand a data table DT2 indicating the rate of increase in the resistance of the positive and negative electrodes; and a DT1 calculation unit calculating a data table DT1 representing the correlations among the temperature, the battery state-of-charge and the upper limit current, and the correlations among the temperature, the battery state-of-charge and the lower limit current on the basis of DT2, a positive electrode state-of-charge, a negative electrode state-of-charge, a battery state-of-charge, and an allowed range for the rate of increase in the battery resistance. The battery control device controls the current of the secondary battery on the basis of DT1 calculated by the DT1 calculation unit.Type: ApplicationFiled: June 22, 2016Publication date: August 2, 2018Applicant: HITACHI, LTD.Inventor: Kohei HONKURA
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Patent number: 9787119Abstract: Provided are: an electric storage device having improved reliability in charging a storage battery; and a charging method. This electric storage device is provided with: an SOC calculation section which calculates a charge rate when a battery voltage reached a predetermined value, in the cases where the battery voltage reached the predetermined value when a lithium ion storage battery is being charged; a voltage difference calculation section, which calculates a battery voltage difference corresponding to a difference between the charge rate and a charge rate at which lithium is deposited; a charge complete voltage calculation means, which calculates a charge complete voltage by adding the voltage difference to the battery voltage obtained when the battery voltage reached the predetermined value; and a charge control means, which completes the charging of the lithium ion storage battery in the cases where the battery voltage reached the charge complete voltage.Type: GrantFiled: December 14, 2012Date of Patent: October 10, 2017Assignee: Hitachi Maxwell, Ltd.Inventors: Shin Yamauchi, Kohei Honkura, Hirofumi Takahashi, Takashi Kamijoh, Mitsuhiro Kishimi
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Publication number: 20170187202Abstract: An electricity storage system includes: a plurality of rechargeable batteries connected in parallel; and a control unit that controls the rechargeable batteries. The control unit detects a deactivation target rechargeable battery of which charge or discharge need to be deactivated, of the rechargeable batteries, electrically separates and deactivates the deactivation target rechargeable battery from a load in a case where a charging rate of the deactivation target rechargeable battery is lower than a predetermined charging rate, and performs control such that a temperature of the deactivated rechargeable battery is within a predetermined temperature range. In this manner, it is possible to disperse ions inside a battery such that it is possible to recover performance of the battery.Type: ApplicationFiled: December 27, 2016Publication date: June 29, 2017Inventors: Seogchul SHIN, Kohei HONKURA, Takashi KAMIJOH, Yuuji NAGASHIMA
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Publication number: 20160204639Abstract: To accurately determine a deterioration state of a secondary battery with respect to a practical current value. Provided are a state determination device of a secondary battery, a state determination method of a secondary battery, a secondary battery system, and a charge and discharge control apparatus having the state determination device. In the state determination device of the secondary battery having a positive electrode and a negative electrode, a capacity reduction parameter group A is determined based on charge and discharge characteristics per reference quantity of the positive electrode and the negative electrode and a current value A, and a resistance increase parameter group B is determined based on the charge and discharge characteristics per reference quantity of the positive electrode and the negative electrode, the capacity reduction parameter group A, and a current value B which is larger than the current value A.Type: ApplicationFiled: September 25, 2013Publication date: July 14, 2016Applicant: HITACHI, LTD.Inventors: Kohei HONKURA, Yutaka OKUYAMA
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Publication number: 20160118816Abstract: A positive electrode potential and a negative electrode potential during charge or discharge of a secondary battery are determined, based on potentials of a positive electrode and a negative electrode in an open circuit state corresponding to a SOC of the secondary battery, and internal resistances of the positive electrode and the negative electrode corresponding to the SOC of the secondary battery, and a current of the secondary battery is controlled such that the positive electrode potential and the negative electrode potential fall within a predetermined range.Type: ApplicationFiled: October 15, 2015Publication date: April 28, 2016Inventor: Kohei HONKURA
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Publication number: 20160104924Abstract: Provided is a secondary battery system includes: a secondary battery; a temperature control device for cooling the secondary battery; a battery management unit; and a temperature detector for detecting a temperature of the secondary battery, in which the battery management unit includes an SOC calculating part for calculating a state of charge (an SOC) of the secondary battery and a potential estimating part for estimating potentials of the anode and the cathode of the secondary battery, and in which the temperature control device is operated when an operating condition is set corresponding to the potentials of the anode and the cathode is met. Thus, it is made achievable to satisfy an elongated serve life of the battery and a cost reduction of a temperature control operation at the same time.Type: ApplicationFiled: October 8, 2015Publication date: April 14, 2016Inventors: Takashi KAMIJOH, Kenji TAKEDA, Kohei HONKURA, Yuuji NAGASHIMA
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Patent number: 9252620Abstract: In order to provide a charge/discharge technology for controlling an assembled battery system without promoting degradation or reduction in the lifetime of the assembled battery system, the assembled battery system includes a function for controlling charge and discharge power of a plurality of units each including a secondary battery and a power converter as one unit, the plurality of units being electrically connected in parallel to each other. When each unit performs charge or discharge by at least one or more times, charge and discharge of the unit are controlled so as not to be performed until a predetermined pause time period elapses.Type: GrantFiled: May 24, 2012Date of Patent: February 2, 2016Assignee: Hitachi, Ltd.Inventors: Shin Yamauchi, Motoo Futami, Kohei Honkura, Hironori Sasaki, Osamu Kubota
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Publication number: 20150318717Abstract: Provided are: an electric storage device having improved reliability in charging a storage battery; and a charging method. This electric storage device is provided with: an SOC calculation section which calculates a charge rate when a battery voltage reached a predetermined value, in the cases where the battery voltage reached the predetermined value when a lithium ion storage battery is being charged; a voltage difference calculation section, which calculates a battery voltage difference corresponding to a difference between the charge rate and a charge rate at which lithium is deposited; a charge complete voltage calculation means, which calculates a charge complete voltage by adding the voltage difference to the battery voltage obtained when the battery voltage reached the predetermined value; and a charge control means, which completes the charging of the lithium ion storage battery in the cases where the battery voltage reached the charge complete voltage.Type: ApplicationFiled: December 14, 2012Publication date: November 5, 2015Inventors: Shin YAMAUCHI, Kohei HONKURA, Hirofumi TAKAHASHI, Takashi KAMIJOH, Mitsuhiro KISHIMI
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Publication number: 20140111163Abstract: In order to provide a charge/discharge technology for controlling an assembled battery system without promoting degradation or reduction in the lifetime of the assembled battery system, the assembled battery system includes a function for controlling charge and discharge power of a plurality of units each including a secondary battery and a power converter as one unit, the plurality of units being electrically connected in parallel to each other. When each unit performs charge or discharge by at least one or more times, charge and discharge of the unit are controlled so as not to be performed until a predetermined pause time period elapses.Type: ApplicationFiled: May 24, 2012Publication date: April 24, 2014Applicant: Hitachi, Ltd.Inventors: Shin Yamauchi, Motoo Futami, Kohei Honkura, Hironori Sasaki, Osamu Kubota
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Publication number: 20130017444Abstract: Disclosed is an electrode for a secondary battery having an electrode compound layer including an electrode active material formed on a current collector, in which the electrode compound layer is provided with a plurality of voids disposed along the thickness direction of the electrode compound layer, the depth of the void is 50% or more of the thickness of the electrode compound layer, the projection area of the voids is 20% or less of the entire projection area of the electrode for a secondary battery, and the length of the cross section of the void is 5 ?m to 100 ?m.Type: ApplicationFiled: July 12, 2012Publication date: January 17, 2013Applicant: HITACHI, LTD.Inventor: Kohei Honkura
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Publication number: 20120194139Abstract: A rechargeable battery system capable of suppressing the increase in the internal resistance of a lithium ion rechargeable battery and having long life is provided. A rechargeable battery system comprising rechargeable battery modules each having a plurality of lithium ion rechargeable batteries, and a charge/discharge control means for controlling assembled batteries having the rechargeable battery modules connected in parallel, in which the charge/discharge control means controls discharge, upon discharge of the lithium ion rechargeable batteries, on every lithium ion rechargeable battery modules connected in parallel is adopted.Type: ApplicationFiled: January 24, 2012Publication date: August 2, 2012Inventors: Hironori SASAKI, Kohei Honkura, Shin Yamauchi, Kenji Takeda, Tsunenori Yamamoto
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Publication number: 20110157755Abstract: A protection circuit of a secondary battery includes a thermal switching element which has an resistance that decreases along with increase of temperature and which is connected in parallel with the secondary battery.Type: ApplicationFiled: August 18, 2010Publication date: June 30, 2011Applicant: Hitachi, Ltd.Inventor: Kohei HONKURA
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Publication number: 20100145644Abstract: It is an object of the present invention to provide a technique for specifically estimating a life expectancy of a secondary battery. The technique performs the steps of: determining an accumulating portion resistance of the secondary battery from an internal resistance thereof; determining an accumulating portion resistance increase coefficient under operating conditions of the secondary battery; and estimating a life expectancy of the secondary battery from the accumulating portion resistance and the accumulating portion resistance increase coefficient.Type: ApplicationFiled: December 7, 2009Publication date: June 10, 2010Applicant: Hitachi, Ltd.Inventor: Kohei HONKURA