Seiko Electronic Components Ltd.

Hiroaki Aihara

Toyoo Harada

Kazutoshi Takeda

Nobuo Kamata

Tatsuo Arakawa

Iwao Kishi

A flat cell is sealed along the confronting peripheral inner surfaces of positive and negative terminal plates. A pair of sealing films are disposed on the respective peripheral inner surfaces. Each sealing film is comprised of a first thermoplastic layer composed of maleic acid modified polyethylene thermally secured to the peripheral inner surface, a second intermediate thermoplastic layer composed of high-density polyethylene and a third thermoplastic layer composed of maleic acid modified polyethylene so that the confronting third layers of the pair of sealing films are thermally secured to each other to seal the flat cell.

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Sendai, Japan

Hiroaki Aihara