Thin flat cell construction having a gas-permeable coated perforated anode

• US 3,901,732 A
• Filed: 07/18/1974
• Issued: 08/26/1975
• Est. Priority Date: 07/18/1974
• Status: Expired due to Term

• Current Assignee: Eveready Battery Company Incorporated (Energizer Holdings, Inc.)
• Original Assignee: Thomas A. Reilly, Tibor Kalnoki Kis
• Inventors: Kalnoki Kis, Tibor, Reilly, Thomas A.
• Primary Examiner(s): Skapars, Anthony
• Application Number:
  US05/489,843
• Time in Patent Office: 404 Days
• Field of Search: 136/111,108,107,177,179,163,10,175
• US Class Current: 429/82
• 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 thin flat cell employing a perforated anode (zinc sheet), a cathode (manganese dioxide), an electrolyte (ammonium chloride) and a cathode collector (steel); said anode being coated with a gas-permeable electrolyte-impermeable polymeric material which allows the venting of undesirable gases formed within the cell while preventing any electrolyte loss from said cell.

Claims

1. A THIN, FLAT CELL HAVING A METAL ANODE, A CATHODE OF DEPOLARIZER MIX, A SEPARATOR BETWEEN SAID ANODE AND SAID CATHODE, AN ELECTROLYTE IN CONTACT WITH SAID ANODE AND SAID CATHODE, AND A CATHODE COLLECTOR, SAID ANODE HAVING A PLURALITY OF OPENINGS FOR VENTING UNDESIRABLE GASES FORMED WITHIN CELL AND HAVING ON ITS OUTER SURFACE A SUBSTANTIALLY CONTINUOUS LAYER OF A GAS PERMEABLE, ELECTROLYTE-IMPERMEABLE PAINT, AND WHEREIN SAID CATHODE, SAID SEPARATOR AND SAID ELECTROLYTE ARE WITHIN AND BOUNDED BY A PERIPHERAL FRAME OF ELECTROLYTE-IMPRMEBLE SEALING MATERIAL, SAID FRAME BEING MARGINALLY ADHERED TO SAID ANODE AND SAID CATHODE COLLECTOR.

2. The cell of claim 1 wherein the cathOde collector has a plurality of openings for venting undesirable gases formed within the cell and has on at least one of its surfaces a substantially continuous layer of a gas-permeable, electrolyte-impermeable conductive paint.

3. The cell of claim 1 wherein the openings in said anode are sized between about 78 square microns and about 65,000 square microns.

4. The cell of claim 3 wherein the openings are sized between about 4,200 square microns and about 25,000 square microns.

5. The cell of claim 1 wherein said anode is zinc, said cathode comprises manganese dioxide, and said electrolyte comprises ammonium chloride.

6. The cell of claim 1 wherein said anode is zinc, said cathode comprises manganese dioxide, and said electrolyte comprises zinc chloride.

7. The cell of claim 2 wherein the openings in said cathode collector are sized between about 78 square microns and about 65, 000 square microns, said anode is zinc, said cathode comprises manganese dioxide and said electrolyte comprises ammonium chloride.

8. The cell of claim 2 wherein the openings in said cathode collector are sized between about 78 square microns and about 65, 000 square microns, said anode is zinc, said cathode comprises manganese dioxide and said electrolyte comprises zinc chloride.

9. A multicell battery comprising an outer negative electrode, an outer positive electrode;

at least one duplex electrode between the outer positive electrode and the outer negative electrode;

a separator and an electrolyte between each positive and negative electrode; and

a cathode collector secured to the outer side of the positive electrode;

said outer negative electrode having a plurality of openings for venting undesirable gases formed within the cell and having on its outer surface a substantially continuous layer of a gas-permeable, electrolyte-impermeable paint;

said duplex electrode comprising a positive electrode bonded to a porous negative electrode via a conductive layer, and all of said components of said battery secured together so as to maintain a relatively low electrical resistance contact between said individual cell components.

10. The battery of claim 9 wherein the cathode collector has a plurality of openings for venting undesirable gases formed within the cell and has on at least one surface a substantially continuous layer of a gas-permeable, electrolyte-impermeable conductive paint.

11. The battery of claim 9 wherein the openings in said negative electrode are sized between about 78 square microns and about 65, 000 square microns.

12. The battery of claim 11 wherein the openings are sized between about 4,200 square microns and about 25,000 square microns.

13. The battery of claim 9 wherein each anode is zinc, each cathode comprises manganese dioxide, and each electrolyte comprises ammonium chloride.

14. The battery of claim 9 wherein each anode is zinc, each cathode comprises manganese dioxide and each electrolyte comprises zinc chloride.

15. The battery of claim 10 wherein the openings in said cathode collector are sized between about 78 square microns and about 65, 000 square microns, each anode is zinc, each cathode comprises manganese dioxide and each electrolyte comprises ammonium chloride.

16. The battery of claim 10 wherein the openings in said cathode collector are sized between about 78 square microns and about 65, 000 square microns, each anode is zinc, each cathode comprises manganese dioxide and each electrolyte comprises zinc chloride.

17. A thin, flat cell having a sheet metal anode;

a cathode of depolarizer mix;

a separator between said anode and said cathode, an electrolyte in contact with said anode and said cathode; and

a cathode collector;

said anode having a plurality of openings for venting undesirable gases formed within the cell and having on its outer surface a substantially continuous layer of a gas-permeable, electrolyte-impermeable paint, And wherein all of said components of said cell are secured together so as to maintain a relatively low electrical resistance contact between said individual cell components.

18. The cell of claim 17 wherein the cathode collector has a plurality of openings for venting undesirable gases formed within the cell and has on at least one surface a substantially continuous layer of a gas-permeable, electrolyte-impermeable conductive paint.

19. The cell of claim 17 wherein the openings in said anode are sized between about 78 square microns and about 65,000 square microns.

20. The cell of claim 19 wherein the openings are sized between about 4,200 square microns and about 25,000 square microns.

21. The cell of claim 17 wherein said anode is zinc, said cathode comprises manganese dioxide, and said electrolyte comprises ammonium chloride.

22. The cell of claim 17 wherein said anode is zinc, said cathode comprises manganese dioxide, and said electrolyte comprises zinc chloride.

23. The cell of claim 18 wherein the openings in said cathode collector are sized between about 78 square microns and about 65, 000 square microns, said anode is zinc, said cathode comprises manganese dioxide and said electrolyte comprises ammonium chloride.

24. The cell of claim 18 wherein the openings in said cathode collector are sized between about 78 square microns and about 65, 000 square microns, said anode is zinc, said cathode comprises manganese dioxide and said electrolyte comprises zinc chloride.