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:
Apr. 28, 2009
Filed:
Jul. 08, 2004
Noriyasu Iwane, Tokyo, JP;
Yuichi Watanabe, Tokyo, JP;
Takezo Sugimura, Tokyo, JP;
Toshiyuki Satoh, Tokyo, JP;
Atsushi Kimura, Tokyo, JP;
Fumikazu Iwahana, Tokyo, JP;
Katsumi Inaniwa, Yokohama, JP;
Tetsuya Kanou, Yokohama, JP;
Noriyasu Iwane, Tokyo, JP;
Yuichi Watanabe, Tokyo, JP;
Takezo Sugimura, Tokyo, JP;
Toshiyuki Satoh, Tokyo, JP;
Atsushi Kimura, Tokyo, JP;
Fumikazu Iwahana, Tokyo, JP;
Katsumi Inaniwa, Yokohama, JP;
Tetsuya Kanou, Yokohama, JP;
The Furukawa Electric Co., Ltd, Tokyo, JP;
Abstract
The method for calculating charged rate of a secondary battery is intended to calculate charged rate of a secondary battery which supplies electric power to loads, and comprises the step to measure voltage of the secondary battery more than once in a predetermined period of time after termination of charge or discharge, the step to determine the coefficients of a quadric or more exponential damping function which approximates the time characteristic of the open circuit voltage of the secondary battery by recursive calculation with the plural measured voltage values, and the step to calculate a convergent value of the open circuit voltage of the secondary battery from at least the exponential damping function with the coefficients determined above. Therefore, precise charged rate of the secondary battery can be calculated from the precise convergent value of the open circuit voltage.