| abstract |
The battery pack of the present invention is a power generation element that is bent by the flexible packaging material on which the battery element is placed to cover the battery element, sealing three sides of the flexible packaging material around the battery element; A hard sheath covering the power generation element, having an opening, and bonded to the soft sheath of the power generation element; And a cover fitted to the opening of the hard exterior material, wherein the hard exterior material has a three-layer structure in which an exterior layer, a metal layer, and a thermal adhesive layer are sequentially stacked, and the thermal adhesive layer is an ethylene-vinyl acetate copolymer or an ethylene-acrylic acid copolymer. , Ethyl acrylate copolymers, methyl acrylate copolymers, methacrylic acid copolymers, methyl methacrylate copolymers, polyacrylonitrile, ethylene vinyl alcohol resins, polyamide resins, polyester resins, acid-modified polypropylenes and At least one material selected from the group consisting of ionomers. |