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:
Jun. 01, 2010
Filed:
Mar. 13, 2003
Eiji Okutani, Itano-gun, JP;
Atsushi Obayashi, Naruto, JP;
Eiji Okutani, Itano-gun, JP;
Atsushi Obayashi, Naruto, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A closed battery, according to the invention, comprises a substantially flat box-type outer casehaving electrical conductivity, provided with an opening on one side in the longitudinal direction thereof and other peripheral sides that are closed, a spiral electrode bodyhoused in the outer case, comprising a positive electrode, a negative electrode, and a separator interposed therebetween, an electrode current collector tablarger in thickness than a core body, welded to a cut and raised piece that is cut and raised from an exposed part of the core body of one of the electrodes of the spiral electrode body, and a sealing platefor covering and sealing the opening of the outer case, wherein the outer case is sealed by laser-welding with the electrode current collector tab being clamped between the rim of the opening and the sealing plate when sealing the opening of the outer case. Under the construction described above, since the mechanical strength of the electrode current collector tab is enhanced, improvements in the performance and reliability of the closed battery can be obtained.