Patents by Inventor Yoshiyuki Nakatamari

Yoshiyuki Nakatamari 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).

  • Charging method and charger
    Patent number: 8344700
    Abstract: A charging method for charging a secondary battery includes the steps of: (a) performing constant-current charging with a first current; and (b) when a voltage of a secondary battery reaches a first voltage, performing constant-voltage charging at the first voltage. When a temperature of the secondary battery is equal to or higher than a reference temperature in step (a), step (b) includes the steps of (b1) when the voltage of the secondary battery reaches a second voltage lower than the first voltage, performing constant-voltage charging at the second voltage, (b2) after step (b1) and when the temperature of the secondary battery falls below the reference temperature, performing charging with a second current, and (b3) when the voltage of the secondary battery reaches the first voltage, performing constant-voltage charging at the first voltage.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: January 1, 2013
    Assignee: Panasonic Corporation
    Inventors: Takeaki Nagashima, Yoshiyuki Nakatamari
  • CHARGING METHOD, CHARGING DEVICE, AND BATTERY PACK
    Publication number: 20110025272
    Abstract: A charging method is a method for charging assembled cells formed by connecting two or more cells in series. Specifically, constant-current charging is performed on the assembled cells, and when the inter-terminal voltage value of one of the cells reaches a first voltage value, the charging current value is reduced from the first current value to a second current value, and constant-current charging in which the charging current value is the second current value is performed on the assembled cells.
    Type: Application
    Filed: March 24, 2009
    Publication date: February 3, 2011
    Inventors: Takeaki Nagashima, Yoshiyuki Nakatamari
  • CHARGING METHOD AND CHARGER
    Publication number: 20100194351
    Abstract: A charging method for charging a secondary battery includes the steps of: (a) performing constant-current charging with a first current; and (b) when a voltage of a secondary battery reaches a first voltage, performing constant-voltage charging at the first voltage. When a temperature of the secondary battery is equal to or higher than a reference temperature in step (a), step (b) includes the steps of (b1) when the voltage of the secondary battery reaches a second voltage lower than the first voltage, performing constant-voltage charging at the second voltage, (b2) after step (b1) and when the temperature of the secondary battery falls below the reference temperature, performing charging with a second current, and (b3) when the voltage of the secondary battery reaches the first voltage, performing constant-voltage charging at the first voltage.
    Type: Application
    Filed: March 3, 2009
    Publication date: August 5, 2010
    Inventors: Takeaki Nagashima, Yoshiyuki Nakatamari