The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2005
Filed:
Nov. 05, 2002
Tetsuya Kanou, Fukushima, JP;
Yuichi Watakabe, Tochigi, JP;
Koji Miyata, Tochigi, JP;
Kiyoshi Takahashi, Tochigi, JP;
Masanobu Narita, Tochigi, JP;
Tetsuya Kanou, Fukushima, JP;
Yuichi Watakabe, Tochigi, JP;
Koji Miyata, Tochigi, JP;
Kiyoshi Takahashi, Tochigi, JP;
Masanobu Narita, Tochigi, JP;
The Furukawa Battery Co., Ltd., Yokohama, JP;
Abstract
In order to monitor a state of a battery, a threshold value of an internal impedance of the battery is first determined. It is prepared an approximate expression indicating a correlation between a residual capacity of the battery and an internal impedance of the battery which is greater than the threshold value. The internal impedance of the battery is then measured. When the measured internal impedance is the threshold value or less, the residual capacity is determined as an initial value. When the measured internal impedance is greater than the threshold value, the residual capacity is monitored with the approximate expression.