| abstract |
The present invention provides a battery packaging material which is thin and has excellent moldability, curls after molding are also effectively suppressed, and can impart sufficient surface insulation to a battery. At least, it is composed of a laminate comprising a polyester film layer, an aluminum alloy foil layer and a heat-sealable resin layer in this order, and the thickness of the polyester film layer is 23 µm or more and 27 µm or less, and the aluminum alloy foil layer is The thickness is 33 μm or more and 37 μm or less, the thickness of the heat-fusible resin layer is 55 μm or more and 65 μm or less, the thickness of the laminate is 130 μm or less, and the insulation of the surface of the polyester film layer side A battery packaging material having a breakdown voltage of 13 kV or more. |