Patent ID: 8383261

Claim:
A film-packaged electric device comprising: an electric device element that has a positive lead, positive electrode plates, positive electrode extending portions that lead out from each of said positive electrode plates, a negative lead, negative electrode plates, negative electrode extending portions that lead out from each of said negative electrode plates, and separators, wherein said positive and negative electrode plates are alternately laminated via the separator, said positive electrode extending portions are collectively joined to said positive lead, and said negative electrode portions are collectively joined to said negative lead; a package film that has a metal layer and a heat fusion layer that is formed on one side of the metal layer, which is configured to surround the electric device element with the heat fusion layer facing inward, and configured such that the heat fusion layers that face each other in a periphery of the package film are heat-fused to each other; and a protection member arranged between a first joining portion that is a portion of the positive electrode extending portion joined to the positive electrode lead and a portion of the heat fusion layer which covers an area of at least the first joining portion, and arranged between a second joining portion that is a portion of the negative electrode extending portion joined to the negative electrode lead and a portion of the heat fusion layer which covers an area of at least the second joining portion, wherein the melting point of the protection member is lower than the melting point of the heat fusion layer.