Battery cell and battery module including the same

A battery cell according to the present disclosure can include a battery case that has an electrode assembly mounted therein. The battery case can include a sealing part having a structure in which the outer peripheral side is sealed by heat fusion. An electrode lead that is electrically connected to the electrode tab can be included in the electrode assembly. The electrode lead can protrude outward from the battery case via the sealing part. A lead film can be located between the electrode lead and the sealing part. A protective member can be in contact with at least a part of an outer surface of the electrode lead. The size of the protective member can vary based on the temperature of the electrode lead.