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1. (WO2018056630) SECONDARY BATTERY

Pub. No.:    WO/2018/056630    International Application No.:    PCT/KR2017/010043
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Thu Sep 14 01:59:59 CEST 2017
IPC: H01M 2/12
H01M 10/04
H01M 10/0587
Applicants: SAMSUNG SDI CO., LTD.
삼성에스디아이 주식회사
Inventors: LEE, Chiyoung
이치영
BYUN, Sangwon
변상원
JANG, Myungjae
장명재
Title: SECONDARY BATTERY
Abstract:
A secondary battery according to one embodiment of the present invention comprises: an electrode assembly having a first electrode, a separator, and a second electrode; a case accommodating the electrode assembly and having an opening with one side open for inserting the electrode assembly; a cap assembly fixedly installed in the opening of the case; a vent hole which is formed on a bottom plate of the case and has side walls which are formed in a multi-step structure; and a vent member installed in the vent hole, wherein the depth of the vent hole is greater than the thickness of the bottom plate.