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, 2008
Filed:
Jan. 13, 2003
Masumi Katsumoto, Fujisawa, JP;
Hideki Kasahara, Naka-gun, JP;
Satoshi Yoneyama, Hiratsuka, JP;
Yoshihiro Boki, Fujisawa, JP;
Masaharu Miyahisa, Fujisawa, JP;
Hideyuki Kumakiri, Chigasaki, JP;
Masumi Katsumoto, Fujisawa, JP;
Hideki Kasahara, Naka-gun, JP;
Satoshi Yoneyama, Hiratsuka, JP;
Yoshihiro Boki, Fujisawa, JP;
Masaharu Miyahisa, Fujisawa, JP;
Hideyuki Kumakiri, Chigasaki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
After accommodating an electrode group in a battery case having a substantially square transverse cross section, making an opening head of the battery case into a cylindrical shape through compression molding, an annular groove is formed by pressing a groove-forming roller sideways against a side surface of the opening head while rotating the battery case with a pressing force being kept applied to the battery case in an axial direction from the opening portion side, or alternatively pressing the groove-forming roller against the opening head from the side surface thereof and concurrently displacing the groove-forming roller in a direction toward the opening portion of the battery case while rotating the battery case. After having an annular supporting portion that bulges inward of the battery case support an opening-sealing member, the opening-sealing member is fixed through caulking by bending the opening end portion of the battery case inward, whereby a battery is manufactured.