Patent ID: 8507118
Filing Date: 2013-08-13
Classification: B23K,H01M,Y02E,Y02P,Y10T

Abstract:
1. A secondary battery comprising: a jelly roll that includes a positive electrode and a negative electrode wound via a separator; a case housing the jelly roll; a lid that seals the case; and electrically conductive input/output members via which charge/discharge power is input and output between the jelly roll and an external load, wherein: the electrically conductive input/output members include, at least; a positive electrode current collector plate with one end thereof connected to the positive electrode; a negative electrode current collector plate with one end thereof connected to the negative electrode; a positive electrode external conductive member with one end thereof connected to another end of the positive electrode current collector plate and another end thereof extending to an outer side of the lid; a negative electrode external conductive member with one end thereof connected to another end of the negative electrode current collector plate and another end thereof extending to the outer side of the lid; the one end of the positive electrode external conductive member and the one end of the negative electrode external conductive member are respectively swage-fused to the other end of the positive electrode current collector plate and the other end of the negative electrode current collector plate; and an oxide layer is formed at a surface of each swage-fused area, wherein the one end of the swage-fused positive electrode external conductive member and the one end of the swage-fused negative electrode external conductive member each include a staged portion passing through the positive electrode current collector plate or the negative electrode current collector plate and projecting out through a surface of the positive electrode current collector plate or the negative electrode current collector plate; and the positive electrode external conductive member is fused with the positive electrode current collector plate at the staged portion and the negative electrode external conductive member is fused with the negative electrode current collector plate at the staged portion, with the oxide layer formed at the surface of each swage-fused area.