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:
Aug. 31, 1999
Filed:
Jun. 20, 1997
Sony Corporation, Tokyo, JP;
Abstract
A cell evaluating method for evaluating characteristics of a secondary cell which can be repeatedly charged and which includes a step of detecting a cell voltage after a predetermined first charge operation for the cell is started, a step of, if the detected cell voltage is smaller than a reference voltage, proceeding to a second charge operation different from the predetermined first charge operation, and a step of evaluating a state of the cell. Moreover, the cell evaluating method includes a step of carrying out a first cell voltage detection after a first predetermined period of time has passed since a halt of the charge or discharge of a cell, a step of carrying out a second cell voltage detection after a second predetermined period of time has passed, and a step of evaluating, if the difference between the results of the first and second detections is not smaller than a predetermined value, that an internal short circuit occurs in the cell.