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:
Jan. 13, 2009
Filed:
Sep. 22, 2006
Hidekatsu Izumi, Osaka, JP;
Tadaya Okada, Osaka, JP;
Yasuo Mukai, Osaka, JP;
Michiko Fujiwara, Osaka, JP;
Shigeto Noya, Osaka, JP;
Hidekatsu Izumi, Osaka, JP;
Tadaya Okada, Osaka, JP;
Yasuo Mukai, Osaka, JP;
Michiko Fujiwara, Osaka, JP;
Shigeto Noya, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided is an alkaline dry battery allowing suppression of polarization in pulse discharge under heavy load to improve discharge characteristics, and having high reliability in safety in case of short circuit. In the positive electrode, a calcium compound having a content of iron element of 150 ppm or less is added in an amount of 0.1 to 10 mol % with respect to a positive electrode active material, a nickel oxyhydroxide powder having 2.95 or more of an average nickel valence and 8 to 18 μm of an average particle diameter is used, the weight ratio of the nickel oxyhydroxide powder and a manganese dioxide powder is in the range of 20:80 to 90:10. A zinc or zinc alloy powder used as negative electrode active material includes a first powder having a particle diameter more than 75 μm and 425 μm or less, and a second powder having a particle diameter more than 5 μm and 75 μm or less, and the weight ratio of the first powder and the second powder is in the range of 65:35 to 75:25, and the concentration of a potassium hydroxide solution is 33 to 35% by weight.