Patent ID: 9012070
Filing Date: 2015-04-21
Classification: H01M,Y02E

Abstract:
1. A secondary battery comprising: an electrode assembly; a pouch case accommodating the electrode assembly and comprising a wing portion at an end of the pouch case, the pouch case including an unsealed part and a sealed part at the wing portion of the pouch case; and an electrode tab including a first side electrically connected to the electrode assembly, and a second side drawn out from the pouch case in a first direction through the wing portion, wherein the unsealed part includes a first unsealed part at an outer periphery of the wing portion which is directed toward the second side of the electrode tab, and a second unsealed part at an inner periphery of the wing portion which is directed toward the electrode assembly, and wherein the sealed part is between the first unsealed part and the second unsealed part, and wherein a width in the first direction of the second unsealed part at a first location is greater than a width in the first direction of the second unsealed part at a second location spaced apart from the first location in a lengthwise direction perpendicular to the first direction.