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:
Sep. 21, 2004
Filed:
Feb. 13, 2003
Tomohiro Kawaguchi, Shizuoka, JP;
Shuji Satake, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
Measuring device measures a terminal voltage of the battery in an open circuit state in a specific cycle after completion of a charge or discharge of the battery and collecting device collects the measured terminal voltage. Computing device computes a voltage value, to which a power approximation expression asymptotically approaches, as an assumed open circuit voltage of each time period from the collected terminal voltage, wherein the power approximation expression has an exponent of −0.5 or about −0.5 and is determined on the basis of the terminal voltage of each time period of a plurality of predetermined time periods. The assumed open circuit voltage of a time period, in which its difference from the assumed open circuit voltage of a neighboring time period becomes minimum, is estimated as an open circuit voltage.