Ribbons for use in shingled solar cells
A string of solar cells is disclosed. The sides of the solar cells have a corrugated shape which forms an opening when the solar cells are arranged in a shingled manner. The solar cells are electrically connected in series by a ribbon that passes through the opening. A wire mesh used to decrease solar cell resistance is also disclosed.
1. A device comprising:
a string of solar cells comprising
at least first and second substantially rectangular crystalline silicon solar cells electrically connected in series, each solar cell comprising front and rear surfaces each having a metallization pattern, a first long side having a corrugated shape with protruding portions and recessing portions, and a second long side; the first and second solar cells arranged in a shingled manner with the protruding portions of the first long side of the second solar cell overlapping with the second long side of the first solar cell;
an opening comprising one of the recessing portions of the first long side of the second solar cell; and
an electrically conductive ribbon passing through the opening connecting the front surface metallization pattern of the second solar cell with the rear surface metallization pattern of the first solar cell.
2. The device of claim 1 , wherein the front surface metallization pattern of each solar cell comprises a plurality of busbars oriented parallel to a short side of the solar cell; and the electrically conductive ribbon is disposed on one of the busbars of the second solar cell.
3. The device of claim 1 , wherein the electrically conductive ribbon comprises a first portion with a flat rectangular cross-sectional area and second portion with a triangular cross-sectional area.
4. The device of claim 2 , wherein a portion of the electrically conductive ribbon runs substantially parallel to the short side of the second solar cell and wherein the portion is disposed on and attached to one of the busbars of the second solar cell.
5. The device of claim 1 , wherein the front surface metallization pattern of each solar cell comprises a busbar oriented parallel to a short side of the solar cell and wherein the busbar is aligned with one of the recessing portions of the first long side of each solar cell.
6. The device of claim 1 , wherein the recessing portions of the first solar cell are not aligned with the recessing portions of the second solar cell.
7. The device of claim 1 , wherein the second long side of each solar cell is straight.
8. The device of claim 1 , wherein the second long side has a corrugated shape with protruding portions and recessing portions.
9. The device of claim 1 , comprising a third substantially rectangular crystalline silicon solar cell, the second and third solar cells arranged in a shingled manner with the protruding portions of the first long side of the third solar cell overlapping with the second long side of the second solar cell.
10. The device of claim 9 , wherein the recessing portions of the first solar cell are aligned with the recessing portion of the third solar cell and not aligned with the recessing portions of the second solar cell.
11. The device of claim 10 , wherein the front surface metallization pattern of each solar cell comprises a busbar oriented parallel to a short side of the solar cell and wherein the busbar is aligned with one of the recessing portions of the first long side of each solar cell.
12. The device of claim 11 , wherein the second long side of each solar cell is straight.
13. The device of claim 1 , comprising a second opening comprising another one of the recessing portions of the first long side of the second solar cell; and a second electrically conductive ribbon passing through the second opening connecting the front surface metallization pattern of the second solar cell with the rear surface metallization pattern of the first solar cell.