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:
May. 20, 1997
Filed:
Mar. 15, 1995
Takashi Imaseki, Zushi, JP;
Nissan Motor Co., Ltd., Kanagawa-ken, JP;
Abstract
A charging and discharging control device for a secondary battery includes a secondary battery, a controller, a charging unit for charging the battery, a ON/OFF switch between the battery and the charging unit and a control switch for controlling the discharge current. At charging the battery, the ON/OFF switch is turned on and a voltage Ve of the secondary battery is compared with a charge stop voltage Vmax by the controller. If Ve.gtoreq.Vmax, the charging operation is ended. At discharging, the control is turned on and the voltage Ve is compared with a discharge stop voltage Vmin. If Ve.ltoreq.Vmin, the discharging operation is ended. Corresponding to charging/discharging history of the battery, the controller corrects the voltage Vmin so as to be increased and the voltage Vmax so as to be decreased, whereby the life span of the secondary battery can be extended.