Patent ID: 9159505
Filing Date: 2015-10-13
Classification: B23K,H01G,H01M,Y02E,Y02P

Abstract:
1. An electric storage device, comprising: an electrode assembly including a positive electrode foil and a negative electrode foil, which are laminated into a multilayer in a mutually insulated state, the electrode assembly having at least one protrusion portion, the protrusion portion being formed of an end portion of any one of the positive electrode foil and the negative electrode foil and protruding in a laminated state in a first direction from a side end of another electrode foil; a current collector including a platelike contact portion in contact with the protrusion portion, the platelike contact portion extending in a second direction perpendicular to the first direction; and a metal material including an opposing face opposed to the protrusion portion, the metal material being configured such that the protrusion portion is interposed between the platelike contact portion of the current collector and the metal material in a third direction perpendicular to the first and second directions, wherein at least an end region in the second direction of the opposing face is displaced in a direction away from the platelike contact portion of the current collector more than a central region in the second direction of the opposing face is displaced, and wherein a shape of the metal material and a shape of the current collector are asymmetric, such that, in an overlapping portion of the metal material and the current collector in the third direction, the end region of the opposing face inclines with respect to the central region of the opposing face, whereas the platelike contact portion extends parallel to the central region of the opposing face.