Laminar batteries

• US 4,172,184 A
• Filed: 09/05/1978
• Issued: 10/23/1979
• Est. Priority Date: 09/05/1978
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Hoffman, Arnold, Norland, Kenneth S., Bloom, Stanley M.
• Primary Examiner(s): LeFevour, Charles F.
• Application Number:
  US05/939,847
• Time in Patent Office: 413 Days
• Field of Search: 429/222, 429/245, 429/162, 204/50 R, 204/292, 204/2.1, 427/123
• US Class Current: 429/162
• CPC Class Codes: H01M 4/12 of consumable metal or alloy electrodes use of alloy compositions as active materials H01M4/38
• CPC Class Codes: H01M 6/12 with flat electrodes

Abstract

A stable high capacity battery employs a lead foil having cadmium plated on at least one side thereof to a thickness of about 0.1 to 3 mils as the anode.

Claims

1. A thin, substantially pinhole free cadmium battery anode comprising a lead foil having cadmium plated on at least one side thereof to a thickness of about 0.1 to 3 mils.

2. The electrode of claim 1 wherein said foil has a thickness of 0.3 to 1 mils.

3. The foil of claim 2 wherein said foil has a thickness of 3.0-10 mils and said cadmium has a thickness of 0.1-3 mils.

4. The electrode of claim 1 wherein said cadmium is plated on both sides of the lead foil, each cadmium layer having said thickness.

5. A primary battery cell comprising the anode of claim 1, a cathode and an electrolyte.

6. The battery cell of claim 5 wherein said cathode is a dry patch cathode.

7. The battery cell of claim 5 wherein said cathode is a planar cathode current carrying on one surface thereof in order, a first cathode stratum and a second cathode stratum, said first cathode stratum being of the dry patch cathode type and comprising a particular dispersion of cathode active particles in a binder matrix, said binder matrix being insoluble in and permeable to an aqueous electrolyte and bonded to said cathode collector, said second cathode stratum being substantially coextensive with said first cathode stratum and comprising a slurry of said cathode active particles dispersed and comprising a slurry of said cathode active particles dispersed in an aqueous electrolyte and adhered to said first cathode stratum.

8. The battery cell of claim 7 having a planar electrolyte ion permeable separator positioned between said anode and said cathode.

9. The battery cell of claim 5 wherein said electrolyte comprises cadmium chloride.

10. A battery comprising a plurality of the battery cells of claim 5 electrically interconnected.

11. A flat laminar battery in accordance with claim 10.

12. The flat laminar battery of claim 11 having a planar electrolyte ion permeable separator positioned between the anode and the cathode of each cell.

13. A laminar electrical cell comprising a cadmium anode consisting of lead foil plated on at least one side with cadmium, a cathode comprising a slurry of manganese dioxide and carbon in an aqueous electrolyte, and an electrolyte permeable separator between a cadmium plated surface of said foil confronting said separator and said slurry cathode.

14. The cell of claim 13, in which said aqueous electrolyte comprises cadmium chloride in water.

15. The cell of claim 13, in which said aqueous electrolyte comprises ammonium chloride and cadmium chloride.