Solar cell module

1. A solar cell module comprising:

an upper substrate;

a lower substrate opposite the upper substrate;

a plurality of solar cells positioned between the upper substrate and the lower substrate,

each of the plurality of solar cells including:

a semiconductor substrate having two first edges extending in a first direction, two second edges extending in a second direction crossing the first direction, and four chamfer edges positioned at which the two first side edges and two second side edges meet each other and extending in a different direction crossing the first and second directions,

a plurality of front electrodes extending in the first direction on a front surface of the semiconductor substrate, and

a plurality of back electrodes extending in the first direction on a back surface of the semiconductor substrate;

a plurality of wiring members electrically connecting two adjacent solar cells of the plurality of solar cells in serial and forming a plurality of solar cell strings, the plurality of wiring members extending in the second direction and electrically connected to the plurality of front electrodes of a first cell of the plurality of solar cells and electrically connected to the plurality of back electrodes of a second cell adjacent to the first cell of the plurality of solar cells;

a transparent upper passivation layer positioned between the upper substrate and the plurality of solar cells;

a transparent lower passivation layer positioned between the plurality of solar cells and the lower substrate; and

a connection terminal configured to connect two adjacent solar cell strings of the plurality of solar cells,

wherein each cross section of the plurality of wiring members has a circle shape or an oval shape, each width of the plurality of wiring members is 0.15 mm to 0.53 mm, and a number of the plurality of wiring members connected to one surface of each solar cell of the plurality of solar cells is 7 to 33,

a cross section of the connection terminal has a rectangular plane shape so that a width of the connection terminal is greater than a thickness of the connection terminal,

the width and the thickness of the connection terminal are greater than each width and thickness of the plurality of wiring members,

the connection terminal is overlapped and connected to the plurality of wiring members connected to each outmost cell of the two adjacent solar cell strings, and

the plurality of wiring members electrically connected to the plurality of front electrodes and the plurality of wiring members electrically connected to the plurality of back electrodes are aligned to overlap each other, wherein the semiconductor substrate is interposed between the plurality of wiring members electrically connected to the plurality of front electrodes and the plurality of wiring members electrically connected to the plurality of back electrodes.

2. The solar cell module of claim 1 , further comprising a cover member configured to cover the connection terminal,

wherein a surface of the cover member is an inclined surface including uneven portions.

3. The solar cell module of claim 2 , wherein the cover member is positioned between the upper substrate and the lower substrate and is packaged by the upper and lower passivation layers.

4. The solar cell module of claim 2 , wherein the cover member is positioned on a surface of the upper substrate.

5. The solar cell module of claim 2 , wherein the cover member is formed by coating a surface of the connection terminal.

6. The solar cell module of claim 1 , wherein the connection terminal is formed of the same material as an electrode of one solar cell or is formed of the same material as the plurality of wiring members.

7. The solar cell module of claim 1 , wherein the connection terminal has a shape different from the plurality of wiring members, and

each of the connection terminal and the plurality of wiring members includes a core layer and a coating layer coating the core layer.

8. The solar cell module of claim 1 , wherein the plurality of wiring members each have a width of 0.24 mm to 0.53 mm, and 10 to 18 wiring members connect the two adjacent solar cells.

9. The solar cell module of claim 8 , wherein one end of each wiring member is connected to the plurality of front electrodes formed on the front surface of a first solar cell of the two adjacent solar cells, and the other end is connected to the plurality of back electrodes formed on the back surface of a second solar cell of the two adjacent solar cells.

10. The solar cell module of claim 1 , wherein the plurality of wiring members, numbering two times more than a number of wiring members used to connect the two adjacent solar cells, are connected to the connection terminal.

11. The solar cell module of claim 7 , wherein the plurality of wiring members have the circle cross-section.

12. The solar cell module of claim 1 , wherein the number of the plurality of wiring members is 7 to 30.

13. The solar cell module of claim 1 , wherein the number of the plurality of wiring members is 9 to 23.

14. The solar cell module of claim 1 , wherein the number of the plurality of wiring members is 10 to 18.

15. The solar cell module of claim 1 , wherein each width of the plurality of wiring members is 0.24 mm to 0.53 mm.

16. The solar cell module of claim 1 , wherein the plurality of front electrodes include:

a plurality of front fingers extended in the first direction crossing the plurality of wiring members; and

a plurality of pads formed at crossings of the plurality of front fingers and the plurality of wiring members.

17. The solar cell module of claim 16 , further comprising a plurality of connection electrodes connected to the plurality of front fingers in the second direction crossing the plurality of front fingers, and

wherein the plurality of wiring members are positioned on the plurality of connection electrodes.

18. The solar cell module of claim 17 , wherein a width of the plurality of pads is more than each width of the plurality of front fingers and the connection electrodes.

19. The solar cell module of claim 1 , wherein the plurality of front electrodes of each cell of the plurality of solar cells includes a plurality of finger electrodes extending in the first direction, and a plurality of connection electrodes extending in the second direction crossing the first direction,

each of the plurality of connection electrodes is overlapped and connected to a respective one of the plurality of wiring members, and

the transparent upper passivation layer and the transparent lower passivation layer are directly contacted to the plurality of solar cells.

20. The solar cell module of claim 19 , wherein each of the plurality of connection electrodes is electrically connected to the plurality of finger electrodes.

21. The solar cell module of claim 19 , further comprising a plurality of pads selectively formed at crossings of the plurality of finger electrodes and the plurality of connection electrodes, and having widths greater than a width of each of the plurality of finger electrodes.