Flat cell
AssigneeSeiko Electronic Components Ltd.
InventorsNobuo Kamata, Iwao Kishi, Toyoo Harada, Kazutoshi Takeda, Hiroaki Aihara, Tatsuo Arakawa
Life of this patent
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Abstract
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.
Claims29
A flat cell comprising:
- a positive terminal plate having an inner surface;
- a positive material in contact with the inner surface of the positive terminal plate;
- a negative material opposed to the positive material;
- a separator interposed between the positive material and the negative material, said separator containing an electrolyte;
- a negative terminal plate having an inner surface in contact with the negative material, the negative terminal plate being confronted with the positive terminal plate at their peripheral portions;
- and sealing means for sealing the confronted peripheral portions of the positive and negative terminal plates with each other, said sealing means comprising a positive sealing member formed on the peripheral portion of the positive terminal plate and a negative sealing member formed on the peripheral portion of the negative terminal plate, said positive sealing member and said negative sealing member being composed of a two-material three-layer film formed of a maleic acid modified polyethylene resin layer/a high-density polyethylene resin layer/a maleic acid modified polyethylene resin layer.
A flat cell as claimed in claim 11;
- wherein the positive material comprises a positive mixture sheet formed of manganese dioxide (MnO.sub.2), an electrically conductive material and a binder.
A flat cell comprising:
- a positive terminal substrate having central and peripheral inner surfaces;
- a negative terminal substrate having a central inner surface spaced apart from the central inner surface of the positive terminal substrate and a peripheral inner surface confronting the peripheral inner surface of the positive terminal substrate;
- a positive electrode disposed in contact with the central inner surface of the positive terminal substrate;
- a negative electrode disposed in contact with the central inner surface of the negative terminal substrate in opposed relation to the positive electrode;
- a separator interposed between the opposed positive and negative electrodes;
- and a pair of sealing films disposed on the respective peripheral inner surfaces of the positive and negative terminal substrates in confronting relation with each other, each sealing film being comprised of a first thermoplastic layer having a relatively low melting temperature and a relatively large adhesive capacity so that the first layer is thermally secured to the peripheral inner surface, a second thermoplastic layer formed on the first layer and having a relatively high melting temperature and a relatively small adhesive capacity, and a third thermoplastic layer formed on the second layer and having a relatively low melting temperature and a relatively large adhesive capacity so that the confronting third layers of the pair of sealing films are thermally secured with each other to seal the flat cell.
Dependencies are inferred from the claim text.