Patent ID: 7794873
Filing Date: 2010-09-14
Classification: H01M,Y02E,Y02P

Abstract:
1. A battery comprising a strip shaped electrode group, said electrode group comprising a first electrode, a second electrode, and a separator interposed therebetween, said first electrode having a strip shaped first current collector and a first active material layer carried on one surface of the first current collector, said first active material layer facing said separator, said second electrode having a strip shaped second current collector and a second active material layer carried on one surface of the second current collector, said second active material layer facing said separator, wherein: said electrode group is folded in a zigzag pattern to form a laminate having a plurality of flat portions, a plurality of first bent portions located on a first end side of said plurality of flat portions in which said first current collector is located on the outermost side, and a plurality of second bent portions located on a second end side that is opposite to said first end side in which said second current collector is located on the outermost side, on at least one of said first end side and said second end side, said bent portions are displaced gradually in one direction from one endmost bent portion on one side toward the other endmost bent portion on the other side, in a predetermined direction perpendicular to the thickness direction of said laminate and said first current collector and said second current collector are exposed to said first end side and said second end side, respectively, and said laminate has a first terminal covering said first current collector exposed to said first end side, and a second terminal covering said second current collector exposed to said second end side.