Secondary battery

摘要

A secondary battery includes a case including an internal space, at least one electrode assembly in the case, the electrode assembly including a separator between a positive electrode plate and a negative electrode plate, and the positive and negative electrode plates including uncoated portions at edges of the electrode assembly, at least one current collector piece coupled to the uncoated portions of the electrode assembly, the at least one current collector piece being inserted into an interior region of the uncoated portions, a current collector terminal coupled to the current collector piece and protruding to an upper portion of the case, and a cap plate coupled to the upper portion of the case.

主权项

1. A secondary battery, comprising:
a case including an internal space; at least one electrode assembly in the case, the electrode assembly including a separator between a positive electrode plate and a negative electrode plate, and the positive and negative electrode plates including uncoated portions at edges of the electrode assembly; a plurality of individual current collector pieces along a same edge of the electrode assembly and coupled to the uncoated portions of the electrode assembly, each current collector piece being inserted into an interior region of the uncoated portions; a current collector terminal coupled to the current collector piece and protruding to an upper portion of the case; and a cap plate coupled to the upper portion of the case, wherein each current collector piece includes:
only one pair of first regions inserted into the interior region of the uncoated portions, the pair of first regions being spaced apart from each other to define a space therebetween, each of the first regions including an inclined surface inserted into the interior region of the uncoated portions, anda second region connecting edges of the pair of the first regions to each other, the second region connecting edges of the first regions opposite to the inclined surfaces, and wherein each first region of each current collector piece includes:a first surface facing and defining the space between the pair of the first regions,a second surface parallel to the first surface, andthe inclined surface connecting the first and second surfaces, the inclined surface defining an obtuse angle with the first surface and an acute angle with the second surface.