Patent ID: 8852796

Claim:
A secondary battery comprising: a pouch case comprising a first case having a receiving part and a second case, wherein a side portion of the first case that has a first thickness and a side portion of the second case that has a second thickness are compressed against each other and adhere to each other wherein the side portion of the first case has a compressed area having a third thickness less than the first thickness with a width of W 1 and the side portion of the second case has a compressed area having a fourth thickness less than the second thickness with a width of W 2 that is greater than the width W 1 ; and an electrode assembly seated into the receiving part of the first case, wherein a protrusion is disposed between the receiving part and the side portion of the first case wherein the protrusion extends outwardly from the receiving part of the first case at a location adjacent an inner edge of the compressed area of the first case so that the combined thickness of the first and second case at the protrusion is greater than both the combined thickness of the first and second case in the compressed area having a width of W 1 and wherein the first and second case are formed of a metal layer and a resin layer and wherein a portion of the protrusion that extends outward from the receiving part of the first case is formed substantially entirely of the resin that forms the at least one layer of resin.