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:
Nov. 16, 2004
Filed:
Oct. 17, 2000
Hiroaki Okamoto, Yamaguchi-ken, JP;
Yoshiyuki Sugimoto, Yamaguchi-ken, JP;
Kinji Saijo, Yamaguchi-ken, JP;
Hiroaki Kawamura, Yamaguchi-ken, JP;
Toyo Kohan Co., Ltd., Tokyo, JP;
Abstract
A method of forming a protective coating on a cell safety valve element by coating the cell safety valve element with a protective film to protect metal portions thereof against corrosion, a cell safety valve element coated with a protective film, a cell sealing plate using the element, and an enclosed cell using the plate. The safety valve element comprises a coating ( ) obtained by applying an organic paint onto at least one surface of the cell safety valve element ( ) consisting of a metal base plate ( ) having a through hole ( ) drilled therein and a metal foil ( ) laminated on the metal base plate ( ) so as to block the through hole ( ). The sealing plate is formed by bringing the cell safety valve element ( ), on which a protective coating ( ) comprising an organic resin film is formed, into contact with a cell exterior can sealing plate ( ), in which the through hole ( ) acting as a safety valve port is drilled so that the through hole ( ) in the metal base plate of the cell safety valve element ( ) and the through hole ( ) in the sealing plate face each other and bonding the both at a portion around the through hole ( ) in the sealing plate to form the cell sealing plate. The enclosed cell is formed by fitting and supporting the cell sealing plate at the inner periphery of an opening of the cell exterior can in which are housed an electrode body consisting of a positive electrode, a negative electrode and a separator together with an electrolyte to block the opening in the cell exterior can.