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:
Apr. 16, 2013
Filed:
Aug. 14, 2009
Yoshiaki Kumashiro, Mito, JP;
Yoshimi Yanai, Kitaibaraki, JP;
Eiji Seki, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a charging/discharging unit provided with: a lithium secondary battery, a voltage detecting sensor for detecting a voltage and a current detecting sensor; the charging/discharging control unit is further provided with a controller, and a discharging element for performing a constant voltage discharging operation of 3 V. A voltage, V, of the battery when a discharging operation is terminated (t=0) is measured by the voltage detecting sensor. If V≦3.6 V, within a rest time during which the battery is not charged/discharged until a next charging operation, a voltage, V, of the battery when a time, t, has elapsed is measured by the voltage detecting sensor. If this voltage charge is in a range of V-V≧0.2 V, then the constant voltage discharging operation of 3 V is carried out for a time duration longer than or equal to 1 hour.