SECONDARY BATTERY WITH ENHANCED SEALING PERFORMANCE

摘要

The present invention relates to a secondary battery provided with an electrode assembly, which is embedded in an angular can, wherein the electrolyte injection port of a base plate, which is mounted on the open top of the angular can, comprises an upper portion having a chamfer structure with the diameter of the inner surface decreasing in the bottom direction, and a lower portion having a non-chamfer structure, wherein the chamfer structure comprises an uneven form so as to increase the path for leaking the electrolyte from the inside to the outside of the secondary battery. The present invention provides the secondary battery in which, when a sealing member is press-fitted into the electrolyte injection port, the sealing member is modified according to the inner surface structure of the electrolyte injection port to perform sealing.