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:
Dec. 28, 2010
Filed:
Jul. 17, 2007
Hiroshi Nakazawa, Tokyo, JP;
Masayuki Kato, Tokyo, JP;
Yasuo Nagasawa, Tokyo, JP;
TDK-Lambda Corporation, Tokyo, JP;
Abstract
A method and device for safety protection of a secondary battery capable of preventing smoking and ignition thereof. A lithium cellas a chargeable and dischargeable secondary battery, a protection circuitfor shutting down charging power Pc at the time of overcurrent, overvoltage, etc., and an electric power restriction circuitfor limiting the charging power Pc input to the lithium cellare incorporated into a battery pack. A battery charger, equipped with a stabilized electric sourceand a charging circuit, inputting the charging power Pc to the lithium cell, is connected to a previous stage of the battery pack. The electric power restriction circuitlimits the charging power Pc within a boundary value Pmax of a safety operation region for safely using the lithium cell, thereby permitting the lithium cellto operate safely under any conditions.