Pouch-type secondary battery

Abstract

A pouch-type secondary battery including: an electrode assembly having a first electrode plate, a second electrode plate, and a separator disposed therebetween; and a pouch case including a first case part having a pouch to house the electrode assembly, a second case part disposed over an open end of the pouch, and sealing portions to seal the second case part to the first case part. The sealing portions include wing portions that are bent to cover opposing sides of the pouch, and bent portions that are bent from the wing portions, to cover a bottom surface of the pouch.

1 . A pouch-type secondary battery, comprising:
 an electrode assembly comprising a first electrode plate, a second electrode plate and a separator disposed between the first electrode plate and the second electrode plate; and   a pouch case comprising, a pouch having a bottom and opposing sides, to house the electrode assembly, a first cover disposed upon the opposing sides of the pouch, and sealing portions to seal the first cover to the pouch,   wherein the sealing portions comprise wing portions that are folded toward the pouch, so as to cover the opposing sides of the pouch, and bent portions that extend from the wing portions, so as to partially cover the bottom of the pouch, and   wherein the wing portions have rounded edges and the wing portions are rounded to match a curvature of the sides of the pouch.   
     
     
         2 . The battery according to  claim 1 , wherein the opposing sides of the pouch are rounded. 
     
     
         3 . The battery according to  claim 1 , wherein the opposing sides of the pouch have rounded edges and the rounded edges of the wing portions face the rounded edges of the opposing sides of the pouch. 
     
     
         4 . The battery according to  claim 3 , wherein there is no separation between the rounded edges of the wing portions and the rounded edges of the opposing sides of the pouch. 
     
     
         5 . The battery according to  claim 1 , wherein the shape of the wing portions matches the shape of the opposing sides of the pouch, such that there is substantially no separation between the wing portions and the opposing sides of the pouch. 
     
     
         6 . The battery according to  claim 3 , wherein the rounded edges of the wing portions have smaller radii of curvature than the rounded edges of the opposing sides of the pouch. 
     
     
         7 . The battery according to  claim 1 , wherein the bent portions are corrugated.