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1. WO2020109969 - SOLAR CELL MODULE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

WHAT IS CLAIMED IS:

1. A solar cell module comprising a light transmissive element, a front encapsulation layer, a plurality of solar cells spaced apart from each other, a post encapsulation layer, and a back sheet disposed in a thickness direction of the solar cell module in turn, wherein the plurality of solar cells spaced apart from each other form an array, the array comprising a plurality of mutually parallel solar cell strings in the same plane perpendicular to the thickness direction, each of the solar cell strings being composed of a plurality of solar cells connected in series, and a string gap is formed between each two adjacent solar cell strings,

wherein the solar cell module further includes a light redirecting film disposed on a surface of the back sheet inside the solar cell module, and an orthogonal projection of the light redirecting film on the back sheet substantially coincides with an orthogonal projection of the string gap on the back sheet,

wherein the light redirecting film includes a concave-convex reflective structure, and the concave-convex reflective structure includes an array of abutting triangular prisms, and

wherein an angle between an orthographic projection of an orientation direction of the array of abutting triangular prisms on the back sheet and an orthographic projection of the solar cell strings on the back sheet is in a range of 45-80 degrees, and a vertical distance between a plane where apexes of the concave-convex reflective structure are located and a plane where the solar cells are located is in a range of 200 - 600 pm.

2. The solar cell module according to claim 1, wherein the angle between an orthographic projection of an orientation direction of the array of abutting triangular prisms on the back sheet and an orthographic projection of the solar cell strings on the back sheet is in a range of 60-80 degrees.

3. The solar cell module according to claim 1, wherein the vertical distance between a plane where apexes of the concave-convex reflective structure are located and a plane where the solar cells are located is in a range of 400 - 550 pm.

4. The solar cell module according to claim 1, wherein the orientation direction of the array of abutting triangular prisms is non-linearly oriented.

5. The solar cell module according to claim 1 , wherein the orientation direction of the array of abutting triangular prisms is linearly oriented.

6. The solar cell module according to claim 5, wherein the array of abutting triangular prisms is an array of parallel triangular prisms wherein one quadrilateral plane of each triangular prism is in the same plane perpendicular to the thickness direction of the solar cell module.

7. The solar cell module according to claim 6, wherein the orientation direction of the array of abutting triangular prisms is a direction perpendicular to a cross section having a smallest area of each triangular prism in the array of abutting triangular prisms.

8. The solar cell module according to claim 1, wherein a cell gap is formed between each two adjacent solar cells in each of the solar cell strings.

9. The solar cell module according to claim 1, wherein an apex angle of each triangular prism in the array of abutting triangular prisms toward the solar cells is in a range of 100 degrees - 140 degrees.

10. The solar cell module according to claim 1, wherein an apex angle of each triangular prism in the array of abutting triangular prisms toward the solar cells is in a range of 110 degrees - 130 degrees.

11. The solar cell module according to claim 1 , wherein a vertical distance from a highest point to a lowest point of the concave-convex reflective structure is between 1 and 25 pm.

12. The solar cell module according to claim 1, wherein the light redirecting film is fixed to a surface of the back sheet inside the solar cell module by an adhesive layer.

13. The solar cell module according to claim 12, wherein the adhesive layer is an

ethylene-vinyl acetate copolymer adhesive layer, a polyolefin resin adhesive layer, a

polypropylene oxide adhesive layer, a polyvinyl butyral adhesive layer, a

tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride copolymer adhesive layer, an ethyl ene-tetrafluoroethylene copolymer adhesive layer, a polyvinylidene fluoride adhesive layer, a polyurethane adhesive layer, a polymethyl methacrylate adhesive layer, a polyimide adhesive layer, an acrylic adhesive layer or an acrylate adhesive layer.

14. The solar cell module according to claim 12, wherein the adhesive layer has a thickness between 10 pm and 100 pm.

15. The solar cell module of claim 1, wherein the light redirecting film further comprises a base layer, and the concave-convex reflective structure is disposed on the base layer.

16. The solar cell module according to claim 1, wherein the base layer is a cellulose acetate butyrate layer, a cellulose acetate propionate layer, a cellulose triacetate layer, a

poly(meth)acrylate layer, a polyethylene terephthalate layer, a polyethylene naphthalate layer, a polyethersulfone layer, a polyurethane layer, a polycarbonate layer, a polyvinyl chloride layer, a syndiotactic polystyrene layer, a cyclic olefin copolymer layer or a silicone layer.

17. The solar cell module according to claim 15, wherein the base layer has a thickness between 10 pm and 100 pm.

18. The solar cell module according to claim 1, wherein the light redirecting film further comprises a light reflecting layer, wherein the light reflecting layer covers the concave-convex reflective structure and conforms to the concave-convex reflective structure.

19. The solar cell module according to claim 18, wherein the light reflecting layer is a metal layer.

20. The solar cell module according to claim 18, wherein the light reflecting layer has a thickness between 30 nm and 100 nm.

21. The solar cell module according to claim 1, wherein the light redirecting film has a total thickness between 20 pm and 150 pm.