Flexible photovoltaic modules having junction box supporting flaps
View Patent ↗Provided are flexible photovoltaic modules having flaps for supporting junction boxes. Junction boxes are used for making electrical connections to photovoltaic cells sealed inside the modules. A flap may be formed by one or two flexible sealing sheets extending beyond the boundary of the photovoltaic cells. A junction box is attached to the front surface of the flap. In certain embodiments, a flap is formed by one sealing sheet, such as a back side sheet. Materials of the back side sheet may be different from materials of the front side sheet and be selected to ensure support to the junction box. Additional support to the junction box may be provided by extending one of its edges in between the two sealing sheets. This edge extension or other features may be used for mechanical protection of electrical leads extending between the junction box and photovoltaic cells.
1. A flexible photovoltaic module comprising:
a front side flexible sealing sheet having a front sheet edge;
a back side flexible sealing sheet sealed with respect to the flexible front side flexible sealing sheet to form a sealed space, wherein an edge seal defines at least a part of the boundary of the sealed space;
one or more flexible photovoltaic cells positioned in the sealed space between the front side flexible sealing sheet and the back side flexible sealing sheet;
an electrical lead electrically connected to the one or more flexible photovoltaic cells and extending outside of the sealed space and through the front sheet edge and the edge seal;
a flap attached to the sealed space and extending on the opposite side of the front sheet edge with respect to the sealed space; and
a junction box attached to the flap, wherein the electrical lead protrudes through the front sheet edge and into the junction box and wherein at least a portion of the junction box is in direct contact with the edge seal.
2. The flexible photovoltaic module of claim 1 , wherein the back side flexible sealing sheet extends beyond the front sheet edge with respect to the sealed space to form at least a portion of the flap.
3. The flexible photovoltaic module of claim 2 , wherein the flap further comprises a top portion attached to a portion of the back side flexible sealing sheet extending beyond the front sheet edge with respect to the sealed space.
4. The flexible photovoltaic module of claim 3 ,
wherein the top portion and the back side flexible sealing sheet comprise a multilayered film comprising a first layer and a second layer; and
wherein the first layer of the multilayered film of the top portion is facing and attached to the first layer of the multilayered film of the back side flexible sealing sheet.
5. The flexible photovoltaic module of claim 2 , wherein the back side flexible sealing sheet has a different composition than the front side flexible sealing sheet.
6. The flexible photovoltaic module of claim 5 , wherein the back side flexible sealing sheet does not contain a fluoro-polymer.
7. The flexible photovoltaic module of claim 5 , wherein the back side flexible sealing sheet comprises one or more materials selected from the group consisting of polypropyelene, ethylene propylene diene monomer, and santoprene.
8. The flexible photovoltaic module of claim 1 , wherein the front side the flap is free from fluorine.
9. The flexible photovoltaic module of claim 1 , wherein a thickness of the back side flexible sealing sheet is less than 40 mils.
10. The flexible photovoltaic module of claim 1 , further comprising an adhesive provided on a back surface of the back side flexible sealing sheet.
11. The flexible photovoltaic module of claim 1 , further comprising a base sheet attached to a back surface of the back side flexible sealing sheet and extending outside of boundaries of the back side flexible sealing sheet.
12. The flexible photovoltaic module of claim 1 , further comprising a puncture resistant structure extending above the electrical lead at least at a location where the electrical lead protrudes through the front sheet edge.
13. The flexible photovoltaic module of claim 12 , wherein the puncture resistant structure comprises a polyethylene terephthalate film.
14. The flexible photovoltaic module of claim 12 , wherein the puncture resistant structure extends into the junction box.
15. The flexible photovoltaic module of claim 12 , wherein the puncture resistant structure extends in between the front side flexible sealing sheet and the back side flexible sealing sheet.
16. The flexible photovoltaic module of claim 1 , further comprises an adhesive bonding the junction box to the back side flexible sealing sheet.
17. The flexible photovoltaic module of claim 1 , wherein a gap between the junction box and the front sheet edge is filled with a sealant.
18. The flexible photovoltaic module of claim 1 , wherein the junction box extends over the front sheet edge of the front side flexible sealing sheet.
19. The flexible photovoltaic module of claim 1 , wherein a front surface of the flap has a light reflecting color.
20. A flexible photovoltaic module comprising:
a front side flexible sealing sheet having a front sheet edge;
a back side flexible sealing sheet sealed with respect to the flexible front side flexible sealing sheet to form a sealed space, wherein an edge seal defines at least a part of the boundary of the sealed space;
one or more flexible photovoltaic cells positioned in the sealed space between the front side flexible sealing sheet and the back side flexible sealing sheet;
an electrical lead electrically connected to the one or more flexible photovoltaic cells and extending outside of the sealed space and through the front sheet edge and the edge seal;
a flap attached to the sealed space and extending on the opposite side of the front sheet edge with respect to the sealed space; and
a junction box attached to the flap, wherein the electrical lead protrudes through the front sheet edge and into the junction box, wherein at least a portion of the junction box is in direct contact with the edge seal, and wherein the junction box comprises a tapered edge extending into at least a part of the edge seal.