| abstract |
The present invention provides a battery capable of preventing the ingress of moisture even when the seal width is narrowed.n n n The battery element provided with the positive electrode and the negative electrode is housed in the film-like exterior member 20. The exterior member 20 includes a metal layer 21, a resin layer 23 provided on the battery element side of the metal layer 21 through an adhesive layer 22, and the resin layer 23 of the metal layer 21. On the opposite side, the resin layer 25 provided through the said adhesive bond layer 24 is provided. The adhesive layer 22 has a water transmittance at a thickness of 25 μm of 800 g / m 2 · day or less at 40 ° C. and 90% RH, and a thickness of 10 μm or less. This prevents the intrusion of moisture into the battery even if the seal width is narrowed.n n n n Separator, electrolyte layer, protective tape, exterior member, seal portion, metal layer, adhesive layer |