| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery easy to handle, low in transmittance and covered with an armoring film for increasing weight and volume energy by forming the armoring film with a laminated film comprising Al layers and resin layers and by providing plural Al layers each of which has a specific thickness. SOLUTION: An armoring film has plural Al layers, each having a thickness of 20μm or less. The armoring film is formed of a five-layer laminated film composed of resin layers 11, 12, 13 and aluminum layers 21, 22. Preferably, the thickness of the resin layer 11 located on the outside surface side of this battery is, in particular, around 1-50μm, that of the resin layer 13 located on the inside surface side of the battery is, in particular, around 10-100μm, and that of the intermediate resin layer 12 interposed between the aluminum layers 21, 22 is, in particular, 20μm or less. The resin of the resin layer 13 is preferably a thermoplastic resin, such as polyethylene for the purpose of sealing by heat-welding, the resins for the resin layers 11, 12 are preferably a thermoplastic resin and a thermosetting resin, respectively. The Al layers 21, 22 may be formed of a rolled Al foil, and deposition or plating may be applied to the resin films of the resin layers 11, 12, 13. |
