Patents by Inventor Kimiaki Ishidu

Kimiaki Ishidu 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).

  • Apparatus for calculating polarization voltage of secondary battery and apparatus for estimating state of charge of the same
    Patent number: 8415954
    Abstract: There is provided an apparatus that calculates a polarization voltage of a secondary battery. A temperature sensor detects a temperature of the secondary battery; a voltage sensor detects a voltage of the secondary battery; and a current sensor detects an electric current of the secondary battery. A battery ECU calculates a polarization voltage based on the electric current and adaptively sets an upper limit value and a lower limit value of the polarization voltage according to a temperature characteristic of the secondary battery. The calculated polarization voltage is compared with an upper limit value and a lower limit value, whereby the polarization voltage is corrected. An SOC is estimated based on the corrected polarization voltage.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: April 9, 2013
    Assignee: Primearth EV Energy Co., Ltd.
    Inventors: Naoshi Akamine, Kimiaki Ishidu
  • APPARATUS FOR CALCULATING POLARIZATION VOLTAGE OF SECONDARY BATTERY AND APPARATUS FOR ESTIMATING STATE OF CHARGE OF THE SAME
    Publication number: 20110156713
    Abstract: There is provided an apparatus that calculates a polarization voltage of a secondary battery. A temperature sensor detects a temperature of the secondary batter; a voltage sensor detects a voltage of the secondary battery; and a current sensor detect an electric current of the secondary battery. A battery ECU calculates a polarization voltage based on the electric current and adaptively sets an upper limit value and a lower limit value of the polarization voltage according to a temperature characteristic of the secondary battery. The calculated polarization voltage is compared with an upper limit value and a lower limit value, whereby the polarization voltage is corrected. An SOC is estimated based on the corrected polarization voltage.
    Type: Application
    Filed: November 29, 2010
    Publication date: June 30, 2011
    Applicant: PRIMEARTH EV ENERGY CO., LTD.
    Inventors: Naoshi Akamine, Kimiaki Ishidu