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. 07, 2004
Filed:
May. 28, 2002
Youichi Arai, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
A discharge current and terminal voltage of the battery are periodically measured while a rush current flows into a predetermined constant load of the loads. The rush current first monotonically increases from zero to a peak value and subsequently monotonically decreases from the peak value to a steady value. A first approximate expression of a current-voltage characteristic for the increasing discharge current and a second approximate expression of a current-voltage characteristic for the decreasing discharge current are computed. An intermediate value of two values of the terminal voltage change per unit current change at points corresponding to the peak values of the first and second approximate expressions excluding a voltage drop caused by a concentration polarization component is computed when the first and second approximate expressions include the voltage drop. The intermediate value computed is measured as the pure resistance of the battery.