Collector grid and interconnect structures for photovoltaic arrays and modules

• US 8,076,568 B2
• Filed: 03/31/2010
• Issued: 12/13/2011
• Est. Priority Date: 04/13/2006
• Status: Expired due to Fees

• Current Assignee: Solannex Incorporated
• Original Assignee: Solannex Incorporated
• Inventors: Luch, Daniel, Luch, Daniel Randolph
• Primary Examiner(s): Ridley, Basia
• Assistant Examiner(s): BERNIER, LINDSEY A
• Application Number:
  US12/798,221
• Publication Number:
  US 20100224230A1
• Time in Patent Office: 622 Days
• Field of Search: 136/244, 136/245, 136/249, 136/251, 136/256
• US Class Current: 136/244
• CPC Class Codes: H01L 31/02008 for solar cells or solar cell modules
• CPC Class Codes: H01L 31/022425 for solar cells
• CPC Class Codes: H01L 31/046 PV modules composed of a plurality of thin film solar cells deposited on the same substrate
• CPC Class Codes: H01L 31/0465 comprising particular structures for the electrical interconnection of adjacent PV cells in the module H01L31/0463 takes precedence
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

An interconnected arrangement of photovoltaic cells is achieved using laminating current collector electrodes. The electrodes comprise a pattern of conductive material extending over a first surface of sheetlike substrate material. The first surface comprises material having adhesive affinity for a selected conductive surface. Application of the electrode to the selected conductive surface brings the first surface of the sheetlike substrate into adhesive contact with the conductive surface and simultaneously brings the conductive surface into firm contact with the conductive material extending over first surface of the sheetlike substrate. Use of the laminating current collector electrodes allows facile and continuous production of expansive area interconnected photovoltaic arrays.

Claims

1. In combination, two electrically interconnected photovoltaic cells and an interconnecting component wherein,

each of said cells has transparent top light incident surface regions,

said interconnecting component comprises a polymeric sheetlike substrate having a top upward facing side and a bottom downward facing side,

a first portion of said sheetlike substrate comprises multiple transparent polymeric layers, a first of said transparent layers comprises a polymeric adhesive forming the downward facing side of said first portion, and a second of said transparent layers comprises a structural polymer overlaying at least a portion of said first adhesive layer,

said first adhesive layer positioned over at least a portion of a first cell, such that said adhesive is in direct physical contact with a transparent top light incident surface region of said first cell,

and wherein said sheetlike substrate extends beyond said first cell such that a second portion of said sheetlike substrate is positioned beneath a second of said cells,

an wherein the upward facing side of said second portion of said sheetlike substrate is formed by a layer of additional polymeric adhesive,

and wherein said structural polymer layer overlays a preponderance of the light incident surface of said first cell and does not overlay the light incident surface of said second cell.

2. The combination of claim 1 wherein said polymeric adhesive layer forming the downward facing side of the first portion is distinct from an adhesive layer contacting the light incident surface of a second cell.

3. The combination of claim 1 wherein said first layer of transparent polymeric adhesive comprises material from the group polyolefins, inomers, polyacrylics, polyacetates, polyurethanes and silicones.

4. The combination of claim 1 wherein a pattern of conductive material is positioned on said downward facing side of said first portion, said pattern extending over a preponderance of said top light incident surface of said first cell, and wherein said pattern is in direct physical contact with said top light incident surface.

5. The combination of claim 1 wherein said first layer of transparent polymeric adhesive has a thickness of 250 micrometers or less.

6. The combination of claim 1 wherein said structural polymer layer overlaying said transparent polymeric adhesive comprises material from the group polyethylene, polypropylene, biaxially oriented polypropylene (BOPP), polyethylene terepthalate (PET), polyethylene naphthalate (PEN), polycarbonate, acrylic or fluorinated polymers.

7. In combination, two electrically interconnected photovoltaic cells and an interconnecting component wherein,

each of said cells has a top light incident surface formed by a transparent conductive material and an oppositely facing bottom surface formed by a conductive material,

said interconnecting component comprises a sheetlike substrate having a top, upward facing side and a bottom downward facing side,

a first portion of said sheetlike substrate comprises multiple polymeric layers positioned beneath at least a portion of a first of said cells, and a first of said polymeric layers comprises a polymeric adhesive forming the upward facing side of said first portion, said polymeric adhesive in direct physical contact with the bottom surface of said first cell, and a second of said polymeric layers comprises a structural polymer underlying at least a portion of said first adhesive layer.

and wherein said sheetlike substrate extends beyond said first cell such that a second portion of said sheetlike substrate is positioned over a preponderance of the top light incident surface of a second of said cells,

and wherein said structural polymer layer does not extend under said second of said cells.

8. The combination of claim 7 wherein said polymeric adhesive layer forming the upward facing surface of said first portion is distinct from an adhesive layer contacting the bottom surface of a second cell.

9. The combination of claim 7 wherein said polymeric adhesive layer comprises material from the group polyolefins, inomers, polyacrylics, polyacetates and silicones.

10. The combination of claim 7 wherein a pattern of conductive material is positioned on the upward facing side of said first portion and wherein said pattern is in direct physical contact with said cell bottom surface.

11. The combination of claim 7 wherein said polymeric adhesive layer has a thickness of 250 micrometers or less.

12. The combination of claim 7 wherein said structural polymer layer underlying said first polymeric layer comprises material from the group polyethylene, polypropylene, biaxially oriented polypropylene (BOPP), polyethylene terepthalate (PET), polyethylene naphthalate (PEN), polycarbonate, acrylic or fluorinated polymers.

13. In combination two electrically interconnected photovoltaic cells and an interconnecting component wherein,

each of said cells has transparent top light incident surface regions and an oppositely facing bottom surface formed by a conductive material,

said interconnecting component comprises a sheetlike substrate having a top upward facing side and a bottom downward facing side, p1 a first portion of said sheetlike substrate comprises multiple transparent polymeric layers overlaying a first of said cells,

a first of said multiple polymeric layers being formed by a transparent polymeric adhesive forming the downward facing side of said first portion in direct physical contact with said transparent top light incident surface region of a first of said cells,

said sheetlike substrate extends outwardly of said first cell such that a portion of said top upward facing side is positioned beneath a second cell,

and wherein said portion of said top upward facing side is formed by additional polymeric adhesive in direct physical contact with said bottom surface of the second cell,

and wherein said first layer of transparent polymeric adhesive overlays a preponderance of the light incident surface of said first cell and does not overlay the light incident surface of said second cell.

14. The combination of claim 13 wherein said first layer comprises a thermoplastic.

15. The combination of claim 13 wherein said first layer comprises material from the group polyolefins, inomers, polyacrylics, polyacetates, polyurethanes and silicones.

16. The combination of claim 13 wherein said interconnecting component comprises Surlyn.

17. The combination of claim 13 wherein said first layer has a thickness of 250 micrometers or less.

18. The combination of claim 13 wherein said interconnecting component comprises a layer of structural polymer overlaying said first layer.

19. The combination of claim 18 wherein said structural polymer comprises material from the group polyethylene, polypropylene, biaxially oriented polypropylene (BOPP), polyethylene terepthalate (PET), polyethylene naphthalate (PEN), polycarbonate, polyacrylic or fluorinated polymers.

20. The combination of claim 13 wherein a pattern of conductive material is positioned on said first layer, said pattern extending over a preponderance of said top light incident surface of said first cell, and wherein said pattern is in direct physical contact with said top light incident surface.

21. The combination of claim 20 wherein the conductive material of the pattern is part of a monolithic form of conductive material extending from said top light incident surface of said first cell to beneath the bottom surface of a second cell.

22. The combination of claim 20 wherein said pattern comprises a layer of metal absent polymer.

23. The combination of claim 20 wherein a portion of a surface of said pattern is formed by material comprising nickel and absent polymer, and wherein said surface is in contact with the light incident surface of said first cell.

24. The combination of claim 20 wherein said pattern comprises multiple substantially parallel conductive traces having ends distal from said second cell, and wherein the distal ends of two adjacent traces are electrically connected by metallic material such that should a first of said two traces become impaired an alternate electrical path exists such that the performance of the cell remains substantially undiminished.

25. The combination of claim 13 wherein said additional adhesive in contact with the bottom conductive surface of said second cell is distinct from adhesive material contacting the bottom conductive surface of said first cell.

26. The combination of claim 13 wherein the light incident surfaces of both said first and second cells are overlayed by a common barrier layer.

27. The combination of claim 26 wherein said common barrier layer comprises glass.

28. The combination of claim 13 wherein said top light incident surface regions comprise a transparent conductive material.

29. The combination of claim 28 wherein said transparent conductive material is a transparent conductive metal oxide.

30. The combination of claim 13 wherein said cells comprise thin film semiconductor.

31. The combination of claim 13 wherein said cells comprise a self supporting metal based foil.

32. The combination of claim 13 wherein said interconnecting component is flexible.

33. The combination of claim 13 further having an aggregate top surface, and wherein said combination is flexible at any point of said aggregate top surface.

34. The combination of claim 18 wherein said layer of structural polymer does not overlay said second cell.

35. The combination of claim 13 wherein said first layer of transparent polymeric adhesive is a cured, non-flowing material.

36. The combination of claim 20 wherein said pattern has a surface formed by a conductive polymer comprising a conductive filler in a polymer matrix.

37. The combination of claim 36 wherein said polymer matrix comprises a polymeric adhesive.

38. The combination of claim 20 further comprising additional conductive material positioned on said upward facing side portion of said substrate formed by said additional polymeric adhesive.