Metal film encapsulation

• US 8,236,443 B2
• Filed: 03/16/2007
• Issued: 08/07/2012
• Est. Priority Date: 08/09/2002
• Status: Active Grant

• Current Assignee: Sapurast Research LLC
• Original Assignee: Infinite Power Solutions, Inc. (Apple Inc.)
• Inventors: Snyder, Shawn W., Neudecker, Bernd J., Brantner, Paul C.
• Primary Examiner(s): LEE, CYNTHIA K
• Application Number:
  US11/687,032
• Publication Number:
  US 20070202395A1
• Time in Patent Office: 1,971 Days
• Field of Search: None
• US Class Current: 429/136
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/50 Current conducting connections for cells or batteries
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y10T 29/49114 including adhesively bonding

Abstract

The present invention relates to metal foil encapsulation of an electrochemical device. The metal foil encapsulation may also provide contact tabs for the electrochemical device. The present invention may also include a selectively conductive bonding layer between a contact and a cell structure.

Claims

1. A battery comprising:

a first electrical contact;

a bonding layer comprising an electronically insulating material coupled with said first electrical contact and comprising an embedded electronic conductor, wherein said embedded electronic conductor contacts said first electrical contact;

a cell structure comprising a cathode, an electrolyte and an anode; and

a second electrical contact,

wherein said bonding layer and said cell structure are sandwiched between said first electrical contact and said second electrical contact.

2. The battery of claim 1, wherein said bonding layer is selectively conductive through said embedded electronic conductor.

3. The battery of claim 1, wherein said cell structure is in selective electrical contact with said first electrical contact via said embedded electronic conductor.

4. The battery of claim 1, wherein said first electrical contact further comprises a metal layer encapsulating a portion of said electrochemical device.

5. The battery of claim 1, wherein said second electrical contact further comprises a substrate.

6. The battery of claim 1, wherein said bonding layer comprises a material selected from the group comprising an adhesive material, an insulating material, plastic, glass, KEVLAR®

, reinforcement materials, and fiberglass.

7. The battery of claim 1, wherein said embedded electronic conductor is selected from the group consisting of a tab, a wire, multiple wires, a wire mesh, perforated metal, a metal coating applied to said bonding layer, and a disk.

8. The battery of claim 1, wherein said embedded electronic conductor is woven within said bonding layer.

9. The battery of claim 8, wherein said bonding layer comprises a slit within which said embedded electronic conductor is woven.

10. The battery of claim 1, wherein said second contact comprises a material selected from the group consisting of gold, platinum, stainless steel, titanium, zirconium, cobalt, aluminum, indium, nickel, copper, silver, carbon, bronze, brass, beryllium, and oxides, nitrides, and alloys thereof.

11. The battery of claim 1, wherein said embedded electronic conductor comprises a material selected from the group consisting of gold, platinum, stainless steel, titanium, zirconium, cobalt, aluminum, indium, nickel, copper, silver, bronze, brass, beryllium, and oxides, nitrides, and alloys thereof.

12. The battery of claim 1 further comprising an insulating layer on said first contact.

13. The battery of claim 12 wherein said insulating layer comprises plastic.

14. The battery of claim 1 further comprising an insulating layer on said second contact.

15. The battery of claim 14 wherein said insulating layer comprises plastic.

16. The battery of claim 1 wherein said cathode is not annealed.

17. The battery of claim 1 wherein said cathode is annealed via rapid thermal anneal.

18. The battery of claim 1 further comprising a barrier layer between said cell structure and said second contact.

19. The battery of claim 1 further comprising a contact area in said first electrical contact.

20. The battery of claim 19 wherein said contact area in said first electrical contact further comprises a lead extending from said first electrical contact.

21. The battery of claim 1 further comprising a contact area in said second electrical contact.

22. The battery of claim 21 wherein said contact area in said second electrical contact further comprises a lead extending from said second electrical contact.

23. The battery of claim 1 further comprising at least one opening in first contact.

24. The battery of claim 1 wherein said first contact comprises a metal foil.

25. The battery of claim 1 wherein said second contact comprises a metal foil.

26. The battery of claim 1 further comprising a plurality of openings in said first contact.

27. The battery of claim 1 further comprising a second cell structure.

28. The battery of claim 24 wherein said battery further comprises a second cell structure having at least one notch and said metal foil also encapsulates said second cell structure with at least one notch, and a portion of said first contact extends over said notch providing an electrical contact tab on said first contact over the notch of said cell structure.

29. The battery of claim 1 wherein the first contact acts as a cathode element of said cell structure.

30. The battery of claim 1 wherein the first contact acts as an anode element of said cell structure.

31. The battery of claim 1 further comprising a plurality of cell structures with at least one notch in each cell structure, and stacked one upon another with at least one metal foil encapsulating each cell structure.

32. The battery of claim 1 wherein said first contact lays over said electrochemical device.

33. The battery of claim 1 wherein said first contact comprises stainless steel.

34. The battery of claim 1 wherein a portion of said first contact is coated with an insulating material.

35. The battery of claim 1 wherein said first contact is less than approximately 100 microns thick.

36. The battery of claim 1 wherein said first contact is less than approximately 50 microns thick.

37. The battery of claim 1 wherein said first contact is less than approximately 25 microns thick.

38. A battery comprising:

a first electrical contact having a contact area and a lead extending from said contact area;

a bonding layer comprising means for electronically conducting between said bonding layer and first electrical contact;

a cell structure comprising a cathode, an electrolyte and an anode; and

a second electrical contact,

wherein said bonding layer and said cell structure are sandwiched between said first electrical contact and said second electrical contact.

44. The battery of claim 38 wherein the first contact acts as a cathode element of said cell structure.

39. A battery comprising:

a first electrical contact;

a bonding layer comprising means for electronically conducting between said bonding layer and first electrical contact;

a cell structure comprising a cathode, an electrolyte and an anode; and

a second electrical contact having a contact area and a lead extending from said second electrical contact,

wherein said bonding layer and said cell structure are sandwiched between said first electrical contact and said second electrical contact.

40. A battery comprising:

a first electrical contact having at least one opening;

a bonding layer comprising means for electronically conducting between said bonding layer and first electrical contact;

a cell structure comprising a cathode, an electrolyte and an anode; and

a second electrical contact,

wherein said bonding layer and said cell structure are sandwiched between said first electrical contact and said second electrical contact.

41. A battery comprising:

a first electrical contact having a plurality of openings;

a bonding layer comprising means for electronically conducting between said bonding layer and first electrical contact;

a cell structure comprising a cathode, an electrolyte and an anode; and

a second electrical contact,

wherein said bonding layer and said cell structure are sandwiched between said first electrical contact and said second electrical contact.

42. A battery comprising:

a first electrical contact;

a bonding layer comprising means for electronically conducting between said bonding layer and first electrical contact;

a cell structure comprising a cathode, an electrolyte and an anode;

a second cell structure having at least one notch and a portion of said first electrical contact extending over said notch providing an electrical contact tab on said first electrical contact;

a metal foil that encapsulates said second cell structure; and

a second electrical contact,

wherein said bonding layer and said cell structure are sandwiched between said first electrical contact and said second electrical contact.

43. The battery of claim 42 wherein said contact tab is a lead extending from said battery.

45. A battery comprising:

a first electrical contact;

a bonding layer comprising means for electronically conducting between said bonding layer and first electrical contact.

a plurality of cell structures each comprising a cathode, an electrolyte, and an anode, each cell structure stacked upon one another with at least one metal foil encapsulating each cell structure;

at least one notch in each cell structure; and

a second electrical contact,

wherein said bonding layer and said plurality of cell structures are sandwiched between said first electrical contact and said second electrical contact.