Solar cell module

1. A solar cell module comprising:

a plurality of solar cells, each solar cell comprising a substrate, a back electrode comprising a plurality of openings that expose portions of a back surface of the substrate and positioned at the back surface of the substrate, and a back electrode current collector positioned at a location of at least one of the plurality of openings;

a plurality of interconnectors for electrically connecting adjacent solar cells; and

a conductive adhesive film positioned between an interconnector of the plurality of interconnectors and the back electrode current collector, and electrically connecting the interconnector and the back electrode current collector,

wherein the back electrode current collector is surrounded by the back electrode in length and width directions of the back electrode current collector,

wherein lengths of the back electrode current collector and the conductive adhesive film are longer than a length of the at least one opening, or widths of the back electrode current collector and the conductive adhesive film are larger than a width of the at least one opening,

wherein a length of the conductive adhesive film is longer than a length of the back electrode current collector,

wherein the conductive adhesive film comprises a first portion directly contacting a back surface of the back electrode current collector and a second portion positioned at the outside of the back electrode current collector in the length direction of the back electrode current collector, the second portion of the conductive adhesive film directly contacting a back surface of the back electrode positioned at the outside of the back electrode current collector in the length direction of the back electrode current collector, and

wherein a portion of the back electrode is interposed between the back electrode current collector and the second portion of the conductive adhesive film.

2. The solar cell module of claim 1 , wherein the back electrode and the back electrode current collector are made of different materials, and a thickness of the back electrode is greater than a thickness of the back electrode current collector.

3. The solar cell module of claim 2 , wherein a difference between the thickness of the back electrode and the thickness of the back electrode current collector is 5 μm to 25 μm.

4. The solar cell module of claim 2 , wherein a thickness of the first portion of the conductive adhesive film is greater than a thickness of the second portion of the conductive adhesive film.

5. The solar cell module of claim 2 , wherein a thickness of the first portion of the conductive adhesive film is substantially the same as a thickness of the second portion of the conductive adhesive film.

6. The solar cell module of claim 2 , wherein a width of the conductive adhesive film is greater than a width of the back electrode current collector.

7. The solar cell module of claim 6 , wherein the second portion of the conductive adhesive film is further positioned at the outside of the back electrode current collector in the width direction of the back electrode current collector.

8. The solar cell module of claim 1 , wherein a width of the conductive adhesive film is greater than a width of the back electrode current collector.

9. The solar cell module of claim 8 , wherein a width of the interconnector is formed smaller than the width of the conductive adhesive film.

10. The solar cell module of claim 9 , wherein the width of the interconnector is greater than or equal to the width of the back electrode current collector.

11. The solar cell module of claim 1 , wherein the portion of the back electrode is overlapped with a portion of the back electrode current collector.

12. The solar cell module of claim 1 , wherein the back electrode current collector and the conductive adhesive film have a line shape.