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. 19, 2009
Filed:
Oct. 05, 2006
Hiroshi Nakazawa, Tokyo, JP;
Hiroshi Nakazawa, Tokyo, JP;
Densei-Lambda Kabushiki Kaisha, Shingawa-ku, Tokyo, JP;
Abstract
There is provided an uninterruptible power supply system capable of preventing life shortening of a lithium-ion secondary battery attributable to its overcharge over the whole period of its use. At the start of use of the lithium-ion secondary battery, a charging voltage is set comparatively low. On the other hand, as the lithium-ion secondary batterycomes closer to an end of its life, its charging voltage becomes higher. A charging control meansvariably sets the charging voltage applied to the lithium-ion secondary batteryso as to realize a discharge duration thereof may become slightly longer than a backup time required for the system and hence life shortening of the lithium-ion secondary batteryattributable to overcharge can be prevented.