Patent ID: 6432574
Filing Date: 2002-08-13
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
A nonaqueous electrolyte secondary battery having a cylindrically shaped battery element comprising positive and negative electrodes and a separator sandwiched between said positive and negative electrodes, each of said positive and negative electrodes having an active material free region, on which no active material is applied, said active material free region having a projecting edge region which projects or extends beyond a first side edge of said separator,wherein a first end of said cylindrically shaped battery element comprises said projecting edge region of said active material free region of one of said positive and negative electrodes, and said first end of said cylindrically shaped battery element has a depressed portion, wherein an electrode tab has a first portion engaged within and welded to said depressed portion and a second portion electrically in contact with an electrode terminal, and wherein said active material free region of said one of said positive and negative electrodes is laminated with a porous sheet having substantially the same thickness as a layer of said active material.