To solve the problems, a battery case of a secondary battery according to an embodiment of the invention includes: a cup portion having an accommodation space configured to house an electrode assembly in which electrodes and separators are stacked; a sealing portion extending outward from the cup portion; and a vent portion attached to a hole formed by piercing at least one of the sealing portion and the cup portion, through which gas passes. The vent portion includes: a molten layer comprising a thermoplastic resin that melts when heat is applied; and a thermosetting layer laminated on one surface of the molten layer and comprising a thermosetting resin that does not melt under heat.
Area Code: KR
Application Number: CN202080051406.6
