Title:
FULL CHARGE DETERMINING METHOD FOR BATTERY
Document Type and Number:
Japanese Patent JP3947952
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent degradation of detection accuracy caused by sensor error and dispersion of a battery characteristic to eliminate determination failure, by determining full charge of a battery based on variation amount of voltage per unit charge amount.
SOLUTION: Full charge is determined when voltage variation rate per unit charge amount is in a region larger than a prescribed positive threshold and the voltage variation rate has a substantially positive peak, and the full charge is not determined in a region smaller than the positive threshold. Therefore, a problem that terminal voltage of a battery varies due to variation of charge voltage, the voltage variation rate dV/dAh has a positive peak, and thus the full charge is erroneously determined can be dissolved. In addition, the full charge is determined when the voltage variation rate dV/dAh is null or a prescribed negative value, the full charge is not determined in a region where this voltage variation rate is null to the positive threshold. Thus, full charge can be determined even at high temperature.
Inventors:
Takafumi Yamashita
Tetsuya Kobayashi
Tetsuya Kobayashi
Application Number:
JP11975699A
Publication Date:
July 25, 2007
Filing Date:
April 27, 1999
Export Citation:
Assignee:
株式会社デンソー
International Classes:
H01M10/48; H02J7/10; H01M10/44; (IPC1-7): H01M10/44; H01M10/48; H02J7/10
Domestic Patent References:
| JP54161030A | ||||
| JP5083876A | ||||
| JP9243717A | ||||
| JP7014612A | ||||
| JP7240234A | ||||
| JP7288936A |
Attorney, Agent or Firm:
Hiroshi Okawa
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