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:
Apr. 04, 2000
Filed:
Aug. 04, 1998
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
There is a sealed battery including a battery case having a lid hermetically joined to the opening portion of an outer jacket, and having a structure in which an electrolyte injection hole in the battery case is hermetically sealed with a metal sealing lid. This sealed battery includes a battery case having a structure in which a metal lid is welded to the opening portion of a metal outer jacket, an electric-power generating element housed in the battery case and having a positive electrode and a negative electrode with a separator being sandwiched therebetween, an electrolyte injection hole formed in the battery case to allow an electrolyte to be injected, and a sealing lid made of a metal plate material which is seam-welded to the battery case including the electrolyte injection hole by laser welding. The sealing lid has a weld portion formed by the laser welding to have a closed loop surrounding the electrolyte injection hole so as to be seam-welded to the battery case. At least one of start and end points of the weld portion is located outside the closed loop.