Secondary battery

Abstract

A secondary battery includes an electrode assembly formed by sequentially stacking positive electrode plates each having a positive electrode tab formed at one side thereof, negative electrode plate each having a negative electrode tab formed at one side thereof, and separators interposed between the positive electrode plates and the negative electrode plates, for insulating the positive and negative electrode plates from each other, the positive electrode tabs being welded to each other to form a positive electrode tab group, and the negative electrode tabs being welded to each other to form a negative electrode tab group, a case having a lower case part having a space in which the electrode assembly is accommodated, and an upper case part connected to one side periphery of the lower case part and fixed to the lower case part, for hermetically sealing the space of the lower case part, the upper case part and the lower case part having sealing portions at the peripheries thereof to be sealed to each other, a positive electrode terminal welded to the positive electrode tab group, the positive electrode tab group being supported in the sealing portion and protruding outward from the case, a negative electrode terminal welded to the negative electrode tab group, the negative electrode tab group being supported in the sealing portion thereof and protruding outward from the case, and an electrolytic solution blocking member which envelops the electrode assembly. The productivity and safety of the battery can be improved.