| abstract |
The present invention provides a secondary battery packaged by a battery packaging material, wherein the battery packaging material is an adhesive layer therein; Aluminum layer in the middle; And an aluminum laminate film including a polymer layer on the outside thereof, wherein an electrically conductive and / or thermally conductive metal foil is attached to one end or both sides of an upper end portion or a lower end portion of the battery outside of the battery packaging material. Or a secondary battery characterized by being connected to both terminals.n n n According to the present invention, by electrically connecting the terminal of the battery and the metal foil outside the packaging material, current flows through the metal foil outside the packaging material when the nail penetrates, thereby suppressing heat generation inside the battery, thereby improving battery safety. |