Patents by Inventor Kaoru Asakura

Kaoru Asakura 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).

  • Capacity estimation method, degradation estimation method and degradation estimation apparatus for lithium-ion cells, and lithium-ion batteries
    Patent number: 6586940
    Abstract: A capacity estimation method for a Li-ion cell is provided. In the method, according to a first aspect, an elapsed time from the time when charge voltage in constant current charge reaches a predetermined voltage to the time when charge condition is changed to a constant voltage mode is used for calculating an estimated capacity of said Li-ion cell. According to a second aspect, a charge current after a lapse of a predetermined time from the time when charge condition is changed to a constant voltage mode is used. According to a third aspect an elapsed time from the time when charge condition is changed to a constant voltage mode to the time when charge current becomes &agr; (0<&agr;<1) times is used.
    Type: Grant
    Filed: March 12, 2001
    Date of Patent: July 1, 2003
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Kaoru Asakura, Toshiro Hirai
  • Capacity estimation method, degradation estimation method and degradation estimation apparatus for lithium-ion cells, and lithium-ion batteries
    Publication number: 20010022518
    Abstract: A capacity estimation method for a Li-ion cell is provided. In the method, according to a first aspect, an elapsed time from the time when charge voltage in constant current charge reaches a predetermined voltage to the time when charge condition is changed to a constant voltage mode is used for calculating an estimated capacity of said Li-ion cell. According to a second aspect, a charge current after a lapse of a predetermined time from the time when charge condition is changed to a constant voltage mode is used. According to a third aspect an elapsed time from the time when charge condition is changed to a constant voltage mode to the time when charge current becomes &agr; (0<&agr;<1) times is used.
    Type: Application
    Filed: March 12, 2001
    Publication date: September 20, 2001
    Inventors: Kaoru Asakura, Toshiro Hirai