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:
Nov. 05, 2002
Filed:
Sep. 17, 1999
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
The present invention provides a lead acid storage battery keeping sufficient cycle life even under vibrating conditions. The lead acid storage battery of the present invention includes an assembly element that is obtained by alternately laying positive electrode plates, each positive electrode plate having an expanded grid, and negative electrode plates, each negative electrode plate being accommodated in a bag-like separator, one upon another. The separator is provided by folding a fine porous synthetic resin sheet and sealing left and right overlapping sides of the folded sheet to have a bag-like shape. The separator has a plurality of vertical ribs that are formed in parallel to one another on an outer surface of the separator and that are located in a central portion of the separator occupying a most part of its width. The separator further has small rib areas that extend along a length of the bag-like separator and that are arranged on left and right sides thereof. Each of the small rib areas includes a large number of small ribs that intersect a left or right side end of the positive electrode plate.