Patent ID: 8053105
Filing Date: 2011-11-08
Classification: H01M,Y02E,Y02P

Abstract:
1. A lithium-ion secondary battery provided with an electrode body where a positive electrode plate obtained by applying positive electrode mixture mainly including positive electrode active material to a current collector and a negative electrode plate obtained by applying negative electrode mixture mainly including negative electrode active material to a current collector are disposed so as to sandwich a separator, wherein at least one of the current collectors of the positive electrode plate and the negative electrode plate is disposed such that an end portion of said at least one of the current collectors of the positive electrode plate and the negative electrode plate projects from an end face of the electrode body, an end portion of each current collector is joined to a face of a current collecting disk positioned on the side of the electrode body at a plurality of joining portions, each joining portion being arranged along a straight line on the face of the current collecting disk and being individually protruded from the face of the current collecting disk, the current collecting disk being made from the same material as the current collector and being disposed so as to face the end face of the electrode body, and at least some of the joining portions which form a plurality of joint portions, in a section along a direction of the straight line shapes, have a width-expanded shape gradually expanding in thickness from a joint end portion with a non-application portion of the electrode mixture on the current collector toward the current collecting disk.