Patent ID: 8337572
Filing Date: 2012-12-25
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A battery comprising: an electrode group comprising a first electrode, a second electrode, and a separator interposed therebetween that are wound or laminated; and a first current collector plate electrically connected to the first electrode, wherein: the first electrode includes a first electrode core member and a first electrode material mixture layer formed on the first electrode core member, the second electrode includes a second electrode core member and a second electrode material mixture layer formed on the second electrode core member, one end portion of the first electrode is protruding from an end portion of the second electrode and an end portion of the separator at one end surface of said electrode group, and the protruding end portion of the first electrode has an exposed portion of the first electrode core member, said exposed portion of the first electrode core member is welded to a connection portion on one surface of the first current collector plate, and an insulating layer is formed in an area except for a reverse face portion of said connection portion on another surface opposed to said one surface of the first current collector plate, and is not in direct contact with a battery case.