METHOD FOR EVALUATING MOISTURE PERMEABILITY OF EXTERNAL MATERIAL FOR POWER STORAGE DEVICE, QUALITY MANAGEMENT METHOD FOR EXTERNAL MATERIAL FOR POWER STORAGE DEVICE, EXTERIOR MATERIAL FOR POWER STORAGE DEVICE, AND METHOD FOR MANUFACTURING POWER STORAGE DEVICE

To provide a new method for evaluating moisture permeability of an external material for a power storage device.SOLUTION: A method for evaluating moisture permeability of an external material for a power storage device includes: a step of preparing an exterior material for a power storage device composed of a laminate having at least a base material layer, a barrier layer and a heat fusible resin layer in this order from outside; a sealing step of sealing a solid-state water absorption agent in a package obtained by heat fusing the heat fusible resin layers on the peripheral edge part of the exterior material for the power storage device; placing the package in which the solid-state water absorption agent is sealed in an environment containing moisture; and a moisture content measurement step of measuring a moisture content that the solid-state water absorption agent in the package absorbs.SELECTED DRAWING: None 【課題】蓄電デバイス用外装材の水分透過性の新規な評価方法を提供する。【解決手段】蓄電デバイス用外装材の水分透過性の評価方法であって、外側から順に、少なくとも、基材層と、バリア層と、熱融着性樹脂層とを備える積層体から構成された蓄電デバイス用外装材を用意する工程と、前記蓄電デバイス用外装材の周縁部において前記熱融着性樹脂層同士を熱融着させて得られる包装体中に、固体状水分吸収剤を密封する密封工程と、前記固体状水分吸収剤が密封された前記包装体を、水分を含む環境に置く工程と、前記包装体中の前記固体状水分吸収剤が吸収した水分量を測定する、水分量測定工程と、を備える、蓄電デバイス用外装材の水分透過性の評価方法。【選択図】なし