Laminar batteries and methods of making the same

• US 4,177,330 A
• Filed: 10/13/1978
• Issued: 12/04/1979
• Est. Priority Date: 11/18/1977
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Gordon, Michael E., Stieger, Frank
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US05/951,122
• Time in Patent Office: 417 Days
• Field of Search: 429/152, 429/153, 429/154, 429/149, 429/160, 429/162, 429/174, 429/122, 429/163
• US Class Current: 429/152
• CPC Class Codes: H01M 6/48 with bipolar electrodes

Abstract

Thin flat electrical cells and batteries comprising frames formed with a central opening for receiving wet electrical cell components and made from a two layered structure of a high melting thermoplastic material and a lower melting thermoplastic material, and methods of making the same.

Claims

1. A laminar battery comprising cells chemically isolated and electrically connected in series by conductive plastic intercell connectors and terminated by conductive plastic current collectors, and provided by liquid impervious seals formed by frames, one for each cell, having central openings to receive the wet cell components and placed between and sealed to confronting borders of the conductive plastic current collectors and intercell connectors, in which said frames each comprise at least first and second opposite surface layers essentially parallel to said conductive plastic intercell connectors and current collectors and formed of first and second different thermoplastic thermally activatable adhesive materials, said first layer being thermally activatable at a substantially lower temperature than said second layer.

4. The battery of claim 1, in which said first thermoplastic materal is a polyamide hot melt adhesive and said second thermoplastic material is a polymeric vinyl material.

5. The battery of claim 1, in which said first thermoplastic material is ethylene vinyl acetate and said second thermoplastic material is a polymeric vinyl material.

6. The laminar battery of claim 1, in which a separator extends over the opening in each of said frames between said first layer of each frame and the adjacent conductive plastic intercell connector or current collector sealed thereto, each separator extending over a portion of the adjacent frame bordering said opening and entirely within said confronting border of said intercell connectors and current collectors sealed to said frames.

2. An electrical cell, comprising a thin flat conductive plastic current collector, a first electrode extending over a central region of said current collector, a separator over said first electrode and extending beyond the borders of said first electrode but within and spaced from the borders of and in contact with said current collector, a frame formed with a central opening in registry with said first electrode, said frame comprising a laminate of first and second thermoplastic heat activatable adhesive materials, said first material being adhesively activatable at a substantially lower temperature than said second material, said first material being in contact with and fused to the borders of said current collector beyond and surrounding said separator and being in contact with said separator, a thin flat conductive plastic intercell connector having a second electrode formed thereon in a central region in registry with said first electrode, said intercell connector being located on said frame in contact with said second material and adhered thereto and said second electrode being located in said opening in said frame confronting said separator.

3. The cell of claim 2, in which the portion of said frame formed of said second material is at least twice as thick as the portion of said frame formed of said first material.