Patent ID: 8367243
Filing Date: 2013-02-05
Classification: H01M,Y02E,Y02P

Abstract:
1. A lithium secondary battery comprising an electrode assembly accommodated in a battery case, said electrode assembly including a positive electrode and a negative electrode which are assembled together with a separator interposing between said both electrodes, each of said electrodes including an active material mixture layer portion and an active material mixture layer-free portion which are arranged on a surface of a metal foil in a width direction of said metal foil corresponding to an axial direction of said electrode assembly and extended in a length direction of said metal foil lying at right angles to said width direction, wherein said active material mixture layer free-portion is arranged at one end side of said metal foil in said width direction to be a part of collector, wherein said active material mixture layer-free portion has an edge with distortion throughout its length and thereby has a deviation between a straight line linking two corners on both extreme ends of said active material mixture layer-free portion in said length direction of said metal foil and said edge with distortion of said active material mixture layer-free portion at a middle point of said straight line in said length direction of said metal foil, wherein a relationship of B B B each of A