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:
Dec. 13, 2011
Filed:
Dec. 03, 2007
Noriyasu Iwane, Tokyo, JP;
Yuichi Watanabe, Tokyo, JP;
Toshiyuki Sato, Tokyo, JP;
Atsushi Kimura, Tokyo, JP;
Fumikazu Iwahana, Tokyo, JP;
Noriyasu Iwane, Tokyo, JP;
Yuichi Watanabe, Tokyo, JP;
Toshiyuki Sato, Tokyo, JP;
Atsushi Kimura, Tokyo, JP;
Fumikazu Iwahana, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
A method for estimating a remaining electrical charge or a remaining capacity of a battery that supplies power to a load, the method including: using, at a controller of a battery system, an approximate exponential decay function including a plurality of exponential function terms of time and a plurality of coefficients; stopping, at the battery system, a charge or discharge operation of the battery for a predetermined time; measuring, at a sensor of the battery system, a voltage of the battery at a plurality of instances during the predetermined time; obtaining, at the controller of the battery system, a relationship between the voltage of the battery and time; determining, at the controller of the battery system, the coefficients based on the obtained relationship between the voltage of the battery and the time.