| 摘要 |
Provided is a battery capable of preventing the entry of water even if a sealing width is reduced. A battery element comprising a cathode and an anode is accommodated in a film-shaped casing. The casing includes a metal layer, a resin layer disposed on a side of the metal layer closer to the battery element with an adhesive layer in between, and a resin layer disposed on a side of the metal layer opposite to the side where the resin layer is formed with an adhesive layer in between. The adhesive layer has a water vapor transmission rate of 800 g/m2.day or less for a thickness of 25 mum at 40° C. and 90% RH and a thickness of 10 mum or less. Thereby, even if the sealing width is reduced, the entry of water into the battery can be prevented.
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