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:
Jul. 12, 2011
Filed:
Mar. 04, 2008
Masahiko Hayakawa, Fukushima, JP;
Masahiko Hayakawa, Fukushima, JP;
Sony Corporation, Tokyo, JP;
Abstract
A battery pack includes a secondary cell, a selection unit, a judging unit, an elapsed time period comparing unit, and a control unit. The selection unit selects either a first operation state or a second operation state. The control unit controls the selection unit to switch from the first operation state to the second operation state when the elapsed time period is longer than a predetermined time period. The control unit also controls the selection unit to switch from a second operation state to a first operation state either (a) when judged as being in an used state by the judging unit while the second operation is selected (b) when a voltage of the second cell becomes equal to or less than a second voltage threshold value which is smaller than a first voltage threshold value while the second operation state is selected.