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. 29, 2004
Filed:
Feb. 27, 2002
Yasuhiko Ikeda, Itano-gun, JP;
Masao Takee, Itano-gun, JP;
Teruhiko Imoto, Itano-gun, JP;
Masao Inoue, Tokushima, JP;
Tetsuyuki Murata, Naruto, JP;
Atsutoshi Ako, Itano-gun, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
In a rectangular alkaline storage battery, the sides of negative cores of negative electrode plates , which are disposed at the outermost positions of the group of electrode plates and oppose an outer casing can , are exposed. The pore ratios (ratio of total area taken up by pores to area of electrode plate) of the exposed cores must be made lower than those of the other unexposed cores. The pore ratio of the exposed negative core is specified as falling within a range of 10% to 40%. As a result, the negative electrode plates are improved in binding strength, thereby inhibiting exfoliation of an active material. Further, there can be obtained a large rectangular alkaline storage battery which has superior permeability for a gas which would arise in the battery, an improved capacity ratio, and greater volumetric energy density.