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. 13, 2004
Filed:
Aug. 02, 2002
Youichi Arai, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
A discharge current and a voltage between a pair of terminals of a battery while a rush current is flowing in a load electrically connected to the pair of the terminals. The rush current simply decreases from a peak to a constant value after the rush current simply increases up to the peak. A first approximate equation is provided for showing a correlation between the current and the voltage in a region where the discharge current is increasing. A second approximate equation is provided for showing a correlation between the current and the voltage in a region where the discharge current is decreasing. A voltage from each of the first and second approximate equations at a point where the discharge current is zero is calculated so that a deference between the two voltages at the current zero point is obtained. The difference is determined to be a total voltage drop due to a concentration polarization of the battery. A voltage drop due to the concentration polarization is calculated from the total voltage drop at any point of the discharge current in use of a relation between the concentration polarization voltage drop and the discharge current with a corresponding discharging time.