Laminar cells and batteries

• US 4,389,470 A
• Filed: 08/24/1981
• Issued: 06/21/1983
• Est. Priority Date: 08/24/1981
• Status: Expired due to Fees

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Plasse, Paul A.
• Primary Examiner(s): Lefevour, Charles F.
• Application Number:
  US06/295,268
• Time in Patent Office: 666 Days
• Field of Search: 429/152, 429/162, 429/144, 429/145, 429/199-201, 429/229-231, 429/224, 429/178
• US Class Current: 429/152
• CPC Class Codes: H01M 6/48 with bipolar electrodes

Abstract

A laminar battery comprising an end terminal formed with a pocket to accept internal components without requiring additional edge thickness in the seal area, incorporating as the separator in at least the cell immediately adjacent the pocketed end terminal a layer of cellophane together with a layer of paper on the side of the cellophane confronting the cathode.

Claims

1. A battery comprising a stack of laminar cells terminated at one end by an end terminal formed with a pocket, said end terminal comprising an external metal collector sheet laminated to a sheet of conductive plastic confronting the cell components, said cells each comprising at least one electrode comprising a slurry of electrochemically active particles in an aqueous electrolyte, a second electrode, and a separator between said slurry electrode and said second electrode, in which at least the separator in the cell adjacent said pocketed end terminal comprises a layer of regenerated cellulose in contact with said second electrode and a layer of porous bibulous material over said regenerated cellulose layer and in contact with said slurry electrode to limit migration of electrolyte from said slurry electrode.

2. The battery of claim 1, in which said porous bibulous material consists essentially of paper.

3. The battery of claim 1, in which the separators in all of the cells each comprise a layer of cellophane in contact with said second electrode and a layer of porous bibulous material over said regenerated cellulose layer.

4. A laminar electrical cell, comprising a powdered zinc anode adhered to a conductive substrate by a binder, a cathode slurry of manganese dioxide and carbon particles in an aqueous solution of electrolyte containing NH₄ Cl and ZnCl₂, and a composite separator between said anode and said cathode slurry, said separator comprising a layer of regenerated cellulose in contact with said anode and a layer of porous bibulous material over said regenerated cellulose layer and in contact with said cathode slurry to limit migration of electrolyte from said cathode slurry.

5. The cell of claim 4, in which said porous bibulous material is paper.