Solar cell module

• US 10,454,413 B2
• Filed: 03/11/2016
• Issued: 10/22/2019
• Est. Priority Date: 03/13/2015
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Maekawa, Akimichi, Irikawa, Junpei, Ishiguro, Tasuku, Hashimoto, Haruhisa, Kanno, Hiroshi
• Primary Examiner(s): Golden, Andrew J
• Application Number:
  US15/067,181
• Publication Number:
  US 20160268964A1
• Time in Patent Office: 1,320 Days
• Field of Search: 136243-265
• CPC Class Codes: B32B 2457/12 Photovoltaic modules
• CPC Class Codes: H01L 31/0488 Double glass encapsulation, e.g. photovoltaic cells arranged between front and rear glass sheets
• CPC Class Codes: H01L 31/0516 specially adapted for interconnection of back-contact solar cells
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: H01L 31/056 the light-reflecting means being of the back surface reflector [BSR] type
• CPC Class Codes: H02S 40/22 Light-reflecting or light-concentrating means directly associated with the PV cell or integrated with the PV cell H01L31/054
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

A solar cell module includes a first solar cell, a second solar cell disposed with a gap from the first solar cell, and a light reflection sheet bridging between the first solar cell and the second solar cell across the gap. The light reflection sheet is at least partially bent between the first and second solar cells.

Claims

1. A solar cell module comprising:

a first solar cell;

a second solar cell disposed with a gap from the first solar cell such that the first and second solar cells are arranged in a first direction;

a third solar cell disposed such that the first and third solar cells are arranged in a second direction intersecting with the first direction; and

a light reflection sheet bridging between the first solar cell and the second solar cell across the gap, the light reflection sheet comprising a resin base member and a light reflection film provided on a light receiving side of the resin base member;

front and back protective members, wherein the first to third solar cells and the light reflection sheet are provided between the front and back protective members;

front-side and back-side bonding members sealing the first to third solar cells and the light reflection sheet between the front and back protective members, such that in an area corresponding to the gap, the front protective member, the front-side bonding member, the light reflection sheet, and the back-side bonding member are provided in the recited order, wherein

each of the first solar cell, the second solar cell, and the third solar cell comprises finger electrodes on a light receiving surface thereof, each of the finger electrodes extending in the first direction,

the resin base member is bonded to both the light receiving surface and a side surface of each of the first solar cell and the second solar cell,

the light reflection film is electrically insulated from the first solar cell and the second solar cell by the resin base member interposed between the light reflection film and the light receiving surfaces of the first and second solar cells in a thickness direction of the solar cells,

one end of the light reflection sheet in the first direction is provided on the light receiving surface of the first solar cell such that an end surface of the one end of the light reflection sheet in the first direction is spaced apart from and faces an end surface of the finger electrode of the first solar cell, and

the other end of the light reflection sheet in the first direction is provided on the light receiving surface of the second solar cell such that an end surface of the other end of the light reflection sheet in the first direction is spaced apart from and faces an end surface of the finger electrode of the second solar cell,

the light reflection film has an uneven shape including concave and convex parts such that the uneven shape of the light reflection film is provided in the area corresponding to the gap and in areas corresponding to the light receiving surfaces of the first and second solar cells,

a portion of the light reflection sheet corresponding to the gap is at least partially curved in a single arcuate shape, as seen in a cross-section of the light reflection sheet,

the front-side bonding member is in direct contact with the front protective member and is in direct contact with the concave parts of the light reflection film which is recessed toward the back-side bonding member, and

in a plan view of the solar cell module, the front-side bonding member is overlapped with the light reflection sheet and the first and second solar cells.

2. The solar cell module according to claim 1, wherein

in the curved portion, a back surface of the light reflection sheet enters into the gap beyond an extension of the light receiving surface of the first solar cell to which the light reflection sheet is attached.

3. The solar cell module according to claim 2, wherein

in the curved portion, a light receiving surface of the light reflection sheet also enters into the gap beyond the extension of the light receiving surface of the first solar cell.

4. The solar cell module according to claim 1, wherein

the portion of the light reflection sheet corresponding to the gap is entirely curved.

5. The solar cell module according to claim 1, wherein

the light reflection sheet comprises light reflection members connected to one another.

6. The solar cell module according to claim 1, wherein

the light reflection sheet further includes an adhesive on a back surface of the resin base member such that the resin base member of the light reflection sheet is bonded to the first solar cell and the second solar cell with the adhesive, and

a thickness of the light reflection sheet in a first portion lateral to an end of the first solar cell is larger than that in a second portion at a center position between the first solar cell and the second solar cell.

7. The solar cell module according to claim 6, wherein

a thickness of the adhesive at a corner of the end of the first solar cell is smaller than that in the second portion.

8. The solar cell module according to claim 1, further comprising a wiring member electrically connecting the first solar cell with the third solar cell, wherein

the wiring member and the light reflection sheet are not overlapped with each other.

9. The solar cell module according to claim 1, wherein

a height between the concave and convex parts of the uneven shape of the light reflection film is smaller than a height of the curve of the curved portion of the light reflection sheet.

10. The solar cell module according to claim 1, wherein

the portion of the light reflection sheet corresponding to the gap includes only one minimum point as a lowest point in the gap, as seen in the cross-section of the light reflection sheet.

21. The solar cell module according to claim 1, wherein

the front-side bonding member is formed of ethylene-vinyl acetate (EVA) or polyolefin.

22. The solar cell module according to claim 1, wherein

the front-side bonding member is formed of ethylene-vinyl acetate (EVA) or polyolefin;

and

the front protective member is formed of a glass substrate.

23. The solar cell module according to claim 22, wherein

the light reflection film is formed of metal.

11. A solar cell module comprising:

a first solar cell;

a second solar cell disposed with a gap from the first solar cell such that the first and second solar cells are arranged in a first direction;

a third solar cell disposed such that the first and third solar cells are arranged in a second direction intersecting with the first direction; and

a light reflection sheet bridging between the first solar cell and the second solar cell across the gap, the light reflection sheet comprising a resin base member and a light reflection film provided on a back side of the resin base member, the back side being opposite to a light receiving side;

front and back protective members, wherein the first to third solar cells and the light reflection sheet are provided between the front and back protective members;

front-side and back-side bonding members sealing the first to third solar cells and the light reflection sheet between the front and back protective members, such that in an area corresponding to the gap, the back protective member, the back-side bonding member, the light reflection sheet, and the front-side bonding member are provided in the recited order, wherein

each of the first solar cell, the second solar cell, and the third solar cell comprises finger electrodes on a back surface thereof, each of the finger electrodes extending in the first direction,

the resin base member is bonded to both the back surface and a side surface of each of the first solar cell and the second solar cell,

the light reflection film is electrically insulated from the first solar cell and the second solar cell by the resin base member interposed between the light reflection film and the back surfaces of the first and second solar cells in a thickness direction of the solar cells,

one end of the light reflection sheet in the first direction is provided on the back surface of the first solar cell such that an end surface of the one end of the light reflection sheet in the first direction is spaced apart from and faces an end surface of the finger electrode of the first solar cell,

the other end of the light reflection sheet in the first direction is provided on the back surface of the second solar cell such that an end surface of the other end of the light reflection sheet in the first direction is spaced apart from and faces an end surface of the finger electrode of the second solar cell,

the light reflection film has an uneven shape including concave and convex parts such that the uneven shape of the light reflection film is provided in the area corresponding to the gap and in areas corresponding to the back surfaces of the first and second solar cells,

a portion of the light reflection sheet corresponding to the gap is at least partially curved in a single arcuate shape, as seen in a cross-section of the light reflection sheet,

the back-side bonding member is in direct contact with the back protective member and is in direct contact with the concave parts of the light reflection film which is recessed toward the front-side bonding member, and

in a plan view of the solar cell module, the back-side bonding member is overlapped with the light reflection sheet and the first and second solar cells.

12. The solar cell module according to claim 11, wherein

in the curved portion, a light receiving surface of the light reflection sheet enters into the gap beyond an extension of the back surface of the first solar cell to which the light reflection sheet is attached.

13. The solar cell module according to claim 12, wherein

in the curved portion, a back surface of the light reflection sheet also enters into the gap beyond the extension of the back surface of the first solar cell.

14. The solar cell module according to claim 11, wherein

the portion of the light reflection sheet corresponding to the gap is entirely curved.

15. The solar cell module according to claim 11, wherein

the light reflection sheet comprises light reflection members connected to one another.

16. The solar cell module according to claim 11, wherein

the light reflection sheet further includes an adhesive on a front surface of the resin base member such that the resin base member of the light reflection sheet is bonded to the first solar cell and the second solar cell with the adhesive, and

a thickness of the light reflection sheet in a first portion lateral to an end of the first solar cell is larger than that in a second portion at a center position between the first solar cell and the second solar cell.

17. The solar cell module according to claim 16, wherein

a thickness of the adhesive at a corner of the end of the first solar cell is smaller than that in the second portion.

18. The solar cell module according to claim 11, further comprising a wiring member electrically connecting the first solar cell with the third solar cell, wherein

the wiring member and the light reflection sheet are not overlapped with each other.

19. The solar cell module according to claim 11, wherein

a height between the concave and convex parts of the uneven shape of the light reflection film is smaller than a height of the curve of the curved portion of the light reflection sheet.

20. The solar cell module according to claim 11, wherein

the portion of the light reflection sheet corresponding to the gap includes only one maximum point as a highest point in the gap, as seen in the cross-section of the light reflection sheet.