Patent ID: 9005805
Filing Date: 2015-04-14
Classification: B29L,H01M,Y02E,Y02T

Abstract:
1. A plate-shaped secondary battery configured to have a structure in which an electrode assembly of a cathode/separator/anode structure is mounted in a battery case in a sealed state by thermal welding, wherein a protuberance is formed at an outer edge sealed portion of an electrode assembly receiving part of the battery case such that the protuberance protrudes upward and downward from the sealed portion, and the protuberance extends along the outer edge of the electrode assembly receiving part continuously in a curved line or in a straight line in a state in which the protuberance is adjacent to the electrode assembly receiving part, wherein the protuberance has a height equivalent to 105% to 300% that of the sealed portion, wherein the protuberance has a width equivalent to 30% or less that of the sealed portion, and wherein a middle of the protuberance is spaced apart from the electrode assembly receiving part by a distance equivalent to 40% or less a width of the sealed portion.