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Patent Searching and Data


Title:
BATTERY CONTROL METHOD
Document Type and Number:
Japanese Patent JP3701755
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To judge the end of a battery life properly by observing the charging time of respective batteries each time, and determining the end of the battery life when the number of occurrence, in which the charging time is smaller than a predetermined value, exceeds a predetermined number of times.
SOLUTION: When the reduction of a remaining battery amount is detected, the battery is transferred to a charging device so as to start charging. The charging amount of the battery during charging is detected, and when the battery is fully charged, a charging completion time is recorded. A required time for charging is obtained from a charging start time and the completion time, this time is compared with a reference time for judging the end of the battery life, and when this time is smaller than the reference time, the life judgement number of times is renewed. This number of times is compared with a reference value, and when this number is larger than the reference value, the use start date of the battery is read so as to judged whether the elapsed time is larger than a predetermined lifetime or not. When the elapsed time passes the lifetime, the operating time of the battery is read, and the operating time is smaller than the predetermined time expressing the lifetime, the end of the battery life is determined.


Inventors:
Koji Shimada
Application Number:
JP1996000307230
Publication Date:
October 05, 2005
Filing Date:
November 01, 1996
Export Citation:
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Assignee:
UMC Japan Co., Ltd.
International Classes:
G01R31/36; B60L3/00; B60L11/18; H01M10/42; H02J7/02; H02J7/04; (IPC1-7): H01M10/42; B60L3/00; B60L11/18; G01R31/36; H02J7/02; H02J7/04
Domestic Patent References:
JP8289416A
JP3284130A
JP3239125A
JP2294231A
JP10066266A
JP7176333A
JP6178406A
JP3001458A
Attorney, Agent or Firm:
Youichi Oshima