Patent ID: 8318341

Claim:
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, the bottom and opposing sides being joined at a plurality of pouch corners; 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 at first folds of the sealing portions and cover the opposing sides of the pouch; and bent portions that extend from the wing portions at second folds of the sealing portions so as to partially cover the bottom of the pouch; wherein the second folds of the sealing portions have a smaller radii of curvature than the radii of curvature of the plurality of pouch corners.