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|1. (WO2018056630) SECONDARY BATTERY|
|Applicants:||SAMSUNG SDI CO., LTD.
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.