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. 21, 2000
Filed:
Mar. 31, 1998
Seiichi Hikata, Annaka, JP;
Natsuki Toyota, Takasaki, JP;
Toshiba Battery Co., Ltd., Tokyo, JP;
Abstract
An object of the present invention is to improve the alkaline dry cell performance by modifying a positive cell case. An alkaline dry cell comprises a can as both of a terminal and a cell case 1 for accommodating a power generating element, prepared by drawing processing of a cold rolled steel material preliminarily applied with nickel-plating on both sides so as to form a can, having a conductive film formed in an inner surface portion contacting with a positive electrode compound, wherein the area of the portion with the conductive film is in the range of 75% to 90% with respect to the area of the whole portion contacting with the positive electrode compound in the inner surface. Since the conductive film is provided, the increase of the contact resistance can be prevented so as to improve the short-circuit current and the storage property. With less than 75% conductive film area, the above-mentioned effect cannot be achieved sufficiently. On the other hand, with more than 90% area, the filler compound can be separated in the dry cell production. Therefore, the above range is appropriate.