公开(公告)号：EP4184674A1

公开(公告)日：2023-05-24

申请号：EP21880369.0

申请日：2021-10-01

申请人： LG Energy Solution, Ltd.

发明人： MIN, Geon Woo ,  LIM, Jae Won ,  CHO, Kyung Wook ,  LEE, Yong Gon ,  LEE, Je Jun ,  HWANGBO, Kwang Su ,  CHO, Min Su ,  KIM, Min Gyu ,  CHAE, Sang Hak

IPC分类号： H01M50/169 ,  H01M50/153 ,  H01M50/109 ,  H01M50/172 ,  H01M10/04

摘要： The present invention provides a button-type secondary battery comprising: an electrode assembly in which electrodes and a separator are wound in a state of being stacked and from which electrode tabs having different polarities protrude from top and bottom surfaces thereof, respectively; a can comprising a bottom part placed below when the electrode assembly is mounted and connected to one electrode tab and a sidewall vertically extending along a circumference of the bottom part; and a top cap assembly provided with a terminal part connected to the other electrode tab and a plate coupled to be insulated from the terminal part and having an edge coupled to an upper end of the sidewall, wherein, when the electrode assembly is mounted in the can, the top cap assembly is coupled to close the can, wherein an end of an edge of the plate is welded to be coupled after being seated on a point that meets the upper end of the sidewall.
In the present invention having the above configuration, since the welding is performed after being seated on the point at which the end of the edge of the plate meets the upper end of the sidewall, the welding may be more stably performed to improve the welding quality.