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:
Mar. 25, 2003
Filed:
Nov. 16, 2000
Hiromi Suzuki, Tokyo, JP;
Shigetomi Morita, Kanagawa, JP;
NEC Tokin Corporation, , JP;
Abstract
A secondary battery has a disconnect assembly for cutting off a current path when a pressure in the battery is abnormal, disposed in an open end of an outer casing. The disconnect assembly includes a rupture disk sealing the open end of the outer casing, a cap electrically connected to a portion of a surface of the rupture disk and serving as an outer terminal of the battery, a weld plate joined to a portion of another surface of the rupture disk and serving as an inner terminal of the battery and having vent holes, and an insulating gasket sealing a gap between the rupture disk and the outer casing and holding the rupture disk and the weld plate in an electrically insulated fashion, except for a space around a junction between the rupture disk and the weld plate. A portion of the rupture disk and the weld plate are so joined that the diffusion of atoms at a junction interface is in an initial stage. An ultrasonic welding machine is used to carry out the above joining.