Solar module and method of manufacturing the same
View Patent ↗A solar module includes an encapsulant and solar cells in the encapsulant. The encapsulant includes a colored encapsulant on one side of the solar cells and a transparent encapsulant on the other side of the solar cells. An interface between the colored encapsulant and the transparent encapsulant is located more on the one side than a main surface of the other side of the solar cells and located more on the other side than a center in a thickness direction of the solar cells.
1. A method of manufacturing a solar module, comprising:
preparing a stacked body in which a colored resin sheet, a solar cell, a transparent resin sheet are stacked in the recited order, in such a manner that the colored resin sheet is provided on one side of the solar cell and the transparent resin sheet is provided on the other side of the solar cell; and
heating and pressurizing the stacked body at such a temperature that a storage elastic modulus of the transparent resin sheet is 1.5 times higher than a storage elastic modulus of the colored resin sheet to obtain a laminated body in which an interface between a colored encapsulant formed from the colored resin sheet on the one side of the solar cell and a transparent encapsulant formed from the transparent resin sheet on the other side of the solar cell is located more toward the one side of the solar cell than a main surface of the other side of the solar cell and located more toward the other side of the solar cell than a center in a thickness direction of the solar cell.
2. The method of manufacturing a solar module according to claim 1 , wherein
the colored resin sheet comprises cross-linked resin, and the transparent resin sheet comprises non-cross-linked resin.
3. The method of manufacturing a solar module according to claim 2 , wherein
the colored resin sheet comprises an ethylene vinyl acetate copolymer, and the transparent resin sheet comprises a polyolefin.
4. The method of manufacturing a solar module according to claim 1 , wherein
the storage elastic modulus of the transparent resin sheet is equal to or less than 1*10 6 Pa.
5. The method of manufacturing a solar module according to claim 4 , wherein
the storage elastic modulus of the colored resin sheet is equal to or less than 5*10 5 Pa.
6. The method of manufacturing a solar module according to claim 4 , wherein
a difference between the storage elastic modulus of the transparent resin sheet and the storage elastic modulus of the colored resin sheet in the pressurizing process is equal or more than 5*10 1 Pa.
7. The method of manufacturing a solar module according to claim 1 , wherein
the temperature is within a range from 50° C. to 150° C.
8. The method of manufacturing a solar module according to claim 1 , wherein
the temperature is set to a temperature that the storage elastic modulus of the transparent resin sheet is 3 times higher than the storage elastic modulus of the colored resin sheet.
9. The method of manufacturing a solar module according to claim 3 , wherein
the colored resin sheet consists essentially of the ethylene vinyl acetate copolymer, and the transparent resin sheet consists essentially of the polyolefin.