| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of short-circuiting by providing a three resin layer configuration, and composing an intermediate layer in the three resin layers of resin whose melting point is higher than those of the rest layers. SOLUTION: A sealant 1 is constituted of an inner layer 1a, an intermediate layer 1b and an outer layer 1c. The inner layer 1a faces a lead 2, the outer layer 1c faces an external member 3 made of a laminated film, and they 1a, 1c are interposed between the lead 2 and the member 3. For example, the inner and outer layers 1a, 1c are made of ionomer whose melting point is about 89 deg.C while the intermediate layer 1b are made of polyethylene telephtalate whose melting poingt is about 260 deg.C. Namely, the melting point of the intermediate layer 1b is higher than those of the layers 1a, 1c by about 171 deg.C. Accordingly, when the inner and outer layers are melted and fused to the lead 2 of electrode and the external member 3, the intermediate layer 1b is not melted and remains as an insulation layer so as to prevent generation of direct contact between a metal foil of laminated film and the lead of the electrode.
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