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. 23, 2002
Filed:
Nov. 09, 1999
Akiyoshi Takada, Shiga, JP;
Kinji Saijo, Yamaguchi, JP;
Kazuo Yoshida, Yamaguchi, JP;
Nobuyuki Yoshimoto, Yamaguchi, JP;
Yoshihiko Isobe, Yamaguchi, JP;
Other;
Abstract
The object of the present invention is to provide a closed battery capable of rapidly releasing the internal pressure thereof and at the same time disconnecting the current to effectively prevent itself from temperature rising and exploding so that in such a completely closed battery it may assure the safety and reliability thereof, when the internal pressure is elevated due to short circuit, overcharge, reverse charge, or the like. A valve element is provided with a slit between the circumference thereof and a metal substrate . When the internal pressure of a battery is elevated, the valve element is smoothly raised up together with a metal foil from a bending fulcrum portion to thereby cut a lead wire or permit a braze portion to detach from the lead wire , thus disconnecting the current reliably. Then, the metal foil which usually closes the slit formed around the circumference of the valve element is allowed to burst stably and accurately at a prescribed pressure to thereby form a valve opening portion so that the internal gas of the battery can be discharged.