Patent ID: 6767667
Filing Date: 2004-07-27
Classification: H01M,Y02E,Y02P

Abstract:
A sealed battery, accommodating a battery element of flat shape, said battery element comprising:a positive electrode and a negative electrode being laminated onto each other with a separator interposed between them and being would together; and a battery case containing said positive and negative electrode, comprising: a front wall, a back wall, and two parallel side walls perpendicular to and connecting said front wall and said back wall said walls surrounding an inside of said battery case having a top and a bottom, wherein a portion of said front wall is recessed and protrudes into the inside of said battery case, and wherein said recessed portion is curved so that the distance from said recessed portion to the top of said battery case is less at a horizontal center between said sides than at a point horizontally nearer to either of said sides.