Patent ID: 8673470
Filing Date: 2014-03-18
Classification: H01M,Y02E,Y02P,Y02T

Abstract:
1. A secondary cell, comprising: an electrode roll in which a positive foil on which a positive-electrode material is coated and a negative foil on which a negative-electrode material is coated are wound through a separator into a flat shape around a winding core; a case in which the electrode roll is housed; a cover which seals the case; a positive terminal and a negative terminal provided on the cover; a positive electrode current collector plate that is electrically connected to the positive foil of the electrode roll and the positive terminal and held by the cover; and a negative electrode current collector plate that is electrically connected to the negative foil of the electrode roll and the negative terminal and held by the cover, wherein: the positive electrode current collector plate and the negative electrode current collector plate are each connected to the winding core, the winding core includes a wide portion at a cover side of the winding core, the winding core includes first projections that project from both end faces of the wide portion of the winding core, the first projections project along a winding axis direction of the electrode roll, and one of the first projections is engaged with a current collector plate connection portion of the positive electrode current collector plate, and another of the first projections is engaged with a current collector plate connection portion of the negative electrode current collector plate so as to fix the first projections and each of the positive and negative electrode current collector plates.