Laminate and photovoltaic power generation system

Abstract

To provide a laminate comprising an installation surface and a back sheet of the bottom of a photovoltaic power generation device, in which a gap is less likely to occur between the installation surface and the back sheet.SOLUTION: A laminate 1 comprises an installation surface 3, an elastic material 4, and a back sheet 6 of the bottom of a photovoltaic power generation device 5. The elastic material 4 is fixed in a state of being placed on the installation surface 3. The back sheet 6 is fixed in a state of being placed on the elastic material 4.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a laminate comprising an installation surface and a backsheet constituting the bottom of a photovoltaic power generation device, and to a photovoltaic power generation system comprising an installation surface and a photovoltaic power generation device. [Background technology]

[0002] In recent years, as shown in Figures 1 and 2, a fiber-containing sheet 400 is placed on the ground 2, and a solar power generation device 401 is placed on the upper surface of the fiber-containing sheet 400. Patent Document 1 discloses the use of a nonwoven fabric for weed control as the fiber-containing sheet 400. Patent Document 2 discloses the use of a solar cell laminate 100 attached to a paved road 1 via an adhesive layer 5. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility model registration No. 3232136 [Patent Document 2] JP 2013-38228 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the above-mentioned conventional fiber-containing sheet 400 and installation surfaces such as the paved road 1 are generally reinforced with fibers or paved with asphalt or the like, and therefore have a low linear expansion coefficient. On the other hand, the back sheet 402 and the solar cell laminate 100 constituting the bottom of the solar power generation device 401 are usually not fiber-reinforced, etc., and have a high linear expansion coefficient, for the purpose of ensuring the flexibility of the solar power generation device, etc. For this reason, the back sheet 402 and the solar cell laminate 100 of the solar power generation device 401 experience thermal expansion and contraction different from that of the installation surface (the fiber-containing sheet 400 or the paved road 1) due to temperature changes.

[0005] 1, when a fiber-containing sheet 400 and a back sheet 402 of a photovoltaic power generation device 401 are bonded with an adhesive 403, a large shear stress occurs between the fiber-containing sheet 400 and the back sheet 402 due to the difference in thermal expansion and contraction. As a result, the back sheet 402 peels off from the fiber-containing sheet 400, and a gap occurs between the fiber-containing sheet 400 and the back sheet 402, making it difficult to stably fix the photovoltaic power generation device 401 for a long period of time. This phenomenon can also occur when the photovoltaic power generation device 401 is placed on an installation surface made of asphalt, metal, hard resin, ceramic, or the like.

[0006] Furthermore, as shown in FIG. 2, when the solar power generation device 401 and the fiber-containing sheet 400 are partially fixed to each other by fixing means such as stakes 404 penetrating the solar power generation device 401 and the fiber-containing sheet 400, wind can enter the gap between the fiber-reinforced sheet 400 and the back sheet 402, causing the solar power generation device 401 to vibrate, resulting in a decrease in the power generation efficiency of the solar power generation device 401 and damage to the power generation cells and wiring.

[0007] Furthermore, with recent technological progress, photovoltaic power generation devices are being considered for enlargement due to their light weight. Conventional rigid photovoltaic power generation devices are difficult to install, work, and transport due to their weight when they are enlarged. For this reason, there is a demand for enlarged flexible photovoltaic power generation devices. However, when a flexible photovoltaic power generation device is enlarged, the deformation due to thermal expansion and contraction of the entire sheet is large compared to when a rigid photovoltaic power generation device is enlarged, and the deformation due to thermal expansion and contraction occurs particularly prominently in the back sheet, which is mainly made of flexible resin material.

[0008] The present invention has been made in consideration of the above-mentioned matters, and its object is to provide a laminate having an installation surface and a back sheet that forms the bottom of a solar power generation device, in which gaps are unlikely to occur between the installation surface and the back sheet.

[0009] A further object of the present invention is to provide a solar power generation system comprising a solar power generation device having a bottom formed by an installation surface and a back sheet, in which gaps are unlikely to occur between the installation surface and the back sheet. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0011] Item 1. Installation surface and An elastic body; A back sheet that constitutes a bottom portion of the solar power generation device, The elastic body is fixed in a state in which it is placed on the installation surface, The back sheet is a laminate that is placed on and fixed to the upper surface of the elastic body.

[0012] Item 2. The laminate according to item 1, wherein the elastic body has a longitudinal elastic modulus of 0.1 MPa or more and 1000 MPa or less.

[0013] Item 3. The laminate according to item 1, wherein a ratio (Eb / Ea) of a transverse elastic modulus Ea of the back sheet to a transverse elastic modulus Eb of the elastic body is 0.002 or more and 0.1 or less.

[0014] Item 4. The laminate according to item 1, wherein the elastic body has a transverse elastic modulus of 0.05 MPa or more and 1000 MPa or less.

[0015] Item 5. The installation surface is made of a fiber-containing sheet, 5. The laminate according to any one of items 1 to 4, wherein the shear peel strength between the fiber-containing sheet and the back sheet via the elastic body is 0.1 N / cm or more.

[0016] Item 6. The installation surface is made of a fiber-containing sheet, 6. The laminate according to any one of items 1 to 5, wherein the elastic body has a linear expansion coefficient larger than that of the fiber-containing sheet and smaller than that of the back sheet.

[0017] Item 7. The solar power generation device includes the back sheet, a power generation unit, a barrier sheet, and a sealant, the barrier sheet is disposed on the opposite side to the back sheet in a thickness direction of the solar power generating device, the power generating section includes a power generating cell which is a photoelectric conversion element utilizing a photovoltaic effect, and is disposed between the back sheet and the barrier sheet; the sealant is filled in a space around the power generating unit between the barrier sheet and the back sheet, 7. The laminate according to any one of items 1 to 6, wherein the sealant has a transverse elastic modulus of 0.01 MPa or more and 500 MPa or less.

[0018] Section 8. Installation surface and An elastic body; A solar power generation device is provided. A solar power generation system in which the elastic body is placed and fixed on the installation surface, and a back sheet constituting the bottom of the solar power generation device is placed and fixed on the upper surface of the elastic body. Effect of the Invention

[0019] According to the laminate and photovoltaic power generation system of the present invention, a gap is unlikely to occur between the installation surface and the back sheet that constitutes the bottom of the photovoltaic power generation device. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a side view of a conventional solar power generation system. [Diagram 2] FIG. 1 is a side view of a conventional solar power generation system. [Diagram 3] 1 is a plan view of a solar power generation system including a laminate according to an embodiment of the present invention. [Figure 4] 1 is a side view of a solar power generation system including a laminate according to an embodiment of the present invention. [Diagram 5]1A is a cross-sectional view of a solar power generation device, FIG. 1B is an enlarged view of part a in FIG. 1A, and FIG. 1C is a cross-sectional view showing the power generation section cut along line AA in FIG. 1A. [Figure 6] FIG. 11 is a side view of a solar power generation system according to a modified example of the present invention. [Figure 7] FIG. 11 is a side view of a solar power generation system according to a modified example of the present invention. [Figure 8] FIG. 11 is a cross-sectional view of a solar power generation system according to a modified example of the present invention. [Figure 9] FIG. 9 is an exploded perspective view of the solar power generation system shown in FIG. 8. [Figure 10] Fig. 10(A) is an enlarged view of a portion corresponding to portion A in Fig. 8. Fig. 10(B) is an enlarged view of portion B in Fig. 10(A). [Figure 11] 11(A) is a cross-sectional view showing a state in which a sealant, a power generation layer, and a barrier sheet are attached to a building board, and (B) is a cross-sectional view of a solar power generation system according to a modified example. [Figure 12] FIG. 11 is a plan view of a solar power generation system according to a modified example of the present invention. [Figure 13] 13 is a cross-sectional view taken along line aa in FIG. 12. [Figure 14] FIG. 11 is a plan view of a solar power generation system according to a modified example of the present invention. [Figure 15] 15 is a cross-sectional view taken along line aa in FIG. 14. [Figure 16] FIG. 16(A) is a cross-sectional view of the fixture, and FIG. 16(B) is an enlarged view of part C in FIG. 16(A). [Figure 17] FIG. 17(A) is a cross-sectional view of the fixture, and FIG. 17(B) is an enlarged view of portion D in FIG. 17(A). [Figure 18] FIG. 11 is a plan view of a solar power generation system according to a modified example of the present invention. [Figure 19] 19 is a schematic cross-sectional view taken along line aa in FIG. 18. [Figure 20] 20(A) to (G) are cross-sectional views of the fixture. [Figure 21]21(A) to (F) are views showing the fixture, with the upper views of FIG. 21(A) to (F) being plan views of the fixture, and the lower views of FIG. 21(A) to (F) being cross-sectional views of the fixture. [Figure 22] FIG. 11 is a perspective view of a portion of a solar power generation system according to a modified example of the present invention. [Figure 23] 23A is a cross-sectional view taken along line aa in FIG. 22, and FIG. 23B is a cross-sectional view taken along line bb in FIG. [Figure 24] FIG. [Diagram 25] 10A to 10C are cross-sectional views illustrating a procedure for peeling off a solar power generation device from an installation surface in a solar power generation system according to a modified example of the present invention. [Figure 26] FIG. 11 is a plan view of a solar power generation system according to a modified example of the present invention. [Figure 27] FIG. 11 is a plan view of a solar power generation system according to a modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 3 is a plan view of a solar power generation system 100 including a laminated body 1 according to an embodiment of the present invention. Fig. 4 is a side view of a solar power generation system 100 including a laminated body 1 according to an embodiment of the present invention. Fig. 5(A) is a cross-sectional view showing a part of the solar power generation system 100. Fig. 5(B) is an enlarged view of part a in Fig. 5(A). Fig. 5(C) is a cross-sectional view showing a state in which a power generation unit 10 described below is cut along line AA in Fig. 5(A).

[0022] (Overall configuration of the photovoltaic power generation system 100 and the laminate 1) The solar power generation system 100 according to this embodiment includes an installation surface 3, an elastic body 4, and a solar power generation device 5. The laminate 1 according to this embodiment constitutes a part of the solar power generation system 100, and includes the installation surface 3, the elastic body 4, and a back sheet 6 that constitutes the bottom of the solar power generation device 5.

[0023] (Installation surface 3) The installation surface 3 is composed of a fiber-containing sheet (hereinafter, the reference symbol 3 of the installation surface will be used as the reference symbol for the fiber-containing sheet as appropriate). The fiber-containing sheet 3 is placed on the ground 2 for the purpose of weed prevention, and is fixed to the ground 2 using stakes 7 that penetrate the fiber-containing sheet 3 and have their tips embedded in the ground. The number and installation positions of the stakes 7 are not particularly limited, and can be set arbitrarily as long as they can fix the fiber-containing sheet 3. The elastic body 4 is placed on the installation surface (the upper surface of the fiber-containing sheet 3). The back sheet 6 is placed on the upper surface of the elastic body 4.

[0024] (Solar power generation device 5) The solar power generation device 5 is formed in a sheet shape and can generate power by receiving sunlight. In this specification, "sheet-like" refers to a shape in which the thickness of the object is 10% or less of the maximum length between the outer edges in a planar view. When the shape in a planar view is rectangular, "the maximum length between the outer edges in a planar view" refers to the length of the diagonal. When the shape in a planar view is circular, "the maximum length between the outer edges in a planar view" refers to the length of the diameter. In this specification, "sheet-like" also includes membrane-like, foil-like, film-like, etc.

[0025] The solar power generation device 5 is formed in a generally rectangular shape when viewed from above. However, in the present invention, the shape of the solar power generation device 5 may be, for example, a generally circular shape when viewed from above, an elliptical shape when viewed from above, a polygonal shape when viewed from above, or the like, and is not particularly limited.

[0026] As shown in Fig. 5(A), the solar power generation device 5 is a device that generates electricity when light is incident on its light-receiving surface, and includes the above-mentioned back sheet 6, power generation section 10, barrier sheet 11, sealant 12, and sealing edge material 13. The barrier sheet 11 constitutes the light-receiving surface 6 of the solar power generation device 5, and is disposed on the opposite side of the back sheet 6 in the thickness direction of the solar power generation device 5. The power generation section 10 is disposed between the back sheet 6 and the barrier sheet 11. The sealant 12 is filled in the space around the power generation section 10 between the barrier sheet 11 and the back sheet 6. The sealing edge material 13 seals the space between the outer periphery 14 of the back sheet 6 and the outer periphery 15 of the barrier sheet 11.

[0027] The photovoltaic power generation device 5 has flexibility. In this specification, "having flexibility" means a property that an object can bend. The bending strength of the photovoltaic power generation device 5 according to this embodiment is not particularly limited, but is preferably 10 MPa or more, more preferably 20 MPa or more, and more preferably 50 MPa or more. The bending strength of the photovoltaic power generation device 5 is preferably 200 MPa or less, more preferably 150 MPa or less, and more preferably 50 MPa or less. The photovoltaic power generation device 5 may be defined by a bending modulus, which is preferably 100 MPa or more, and more preferably 500 MPa or more. On the other hand, the bending modulus of the photovoltaic power generation device 5 is preferably 10000 MPa or more, and more preferably 5000 MPa or less. When the photovoltaic power generation device 5 is defined by the bending modulus of elasticity, the bending strength may not be included in the above range. The bending strength and bending modulus of elasticity of the photovoltaic power generation device 5 are measured in accordance with JIS K 7171. In this way, the solar power generation device 5 has flexibility, so that it can conform to the shape of the installation surface 3, and further, when installed, it is less likely to flap about due to wind or the like.

[0028] (Back seat 6) The back sheet 6 has a barrier property against water vapor and a protective property against external forces. The back sheet 6 may be light-transmitting, but is not necessarily required to be light-transmitting.

[0029] In this specification, the term "translucent" means that the light transmittance is 10% or more with respect to the peak wavelength of the light before incidence.

[0030] The back sheet 6 has flexibility. The modulus of longitudinal elasticity (modulus of longitudinal elasticity) of the back sheet 6 is preferably 2400 MPa or more, more preferably 3000 MPa or more. The modulus of longitudinal elasticity (modulus of longitudinal elasticity) of the back sheet 6 is preferably 4200 MPa or less, more preferably 3100 MPa or less. Examples of the material of the back sheet 6 include synthetic resins such as thermoplastic resins, thermosetting resins, general-purpose plastics, engineering plastics, and vinyl resins (e.g., polyvinyl chloride). Examples of the material of the back sheet 6 that may be used include natural resins, rubber, metals, carbon, and pulp, in addition to synthetic resins.

[0031] The thickness of the back sheet 6 is preferably 50 μm or more, and more preferably 100 μm or more, and is preferably 2000 μm or less, and more preferably 1000 μm or less.

[0032] The back sheet 6 is adhered to the upper surface of the elastic body 4 using an adhesive 8, and is fixed in a state in which it is placed on the upper surface of the elastic body 4.

[0033] The adhesive 8 may be, for example, a resin composition containing at least one selected from vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin, cyanoacrylate resin, acrylic resin, chloroprene rubber, styrene, butadiene rubber, polyurethane resin, silicone resin, and modified silicone resin. The adhesive 8 of the present invention is not limited to the above-mentioned resin composition. The adhesive 8 preferably has a viscosity of 800 cP or more, but the viscosity of the adhesive may be less than 800 cP. The laminate 1 may be provided with an adhesive elastic resin that serves both as the adhesive 8 and the elastic body 4.

[0034] (Power Generation Section 10) The power generation section 10 includes a power generation cell 20, which is a photoelectric conversion element that utilizes the photovoltaic effect. In this embodiment, the power generation section 10 is configured as a photoelectric conversion unit in which a plurality of power generation cells 20 are arranged in the surface direction of the solar power generation device 5 (for example, in the longitudinal direction or width direction of the solar power generation device 5). Note that the power generation section 10 may be configured with a single power generation cell 20.

[0035] (Power generating cell 20) The power generating cell 20 includes a light-transmitting substrate 21, a light-transmitting conductive layer 22, a power generating layer 23, and an electrode 24. The light-transmitting substrate 21, the light-transmitting conductive layer 22, the power generating layer 23, and the electrode 24 are laminated in this order along a direction from the barrier sheet 11 toward the back sheet 6. In other words, they are disposed so that the light-transmitting substrate 21 faces the barrier sheet 11, and the electrode 24 faces the back sheet 6.

[0036] (Translucent base material 21) The translucent base material 21 supports the translucent conductive layer 22, the power generation layer 23, and the electrode 24. The translucent base material 21 has translucency. The translucency of the translucent base material 21 may be such that the light transmittance is 10% or more with respect to the peak wavelength of the light before incidence, but is preferably 50% or more, and more preferably 80% or more. In this specification, a light transmittance of 80% or more with respect to the peak wavelength of the light before incidence is defined as "transparent."

[0037] Examples of materials for the light-transmitting substrate 21 include inorganic materials, organic materials, and metal materials. Examples of inorganic materials include quartz glass and non-alkali glass. Examples of organic materials include plastics such as polyethylene terephthalate (PET), polyethylene naphthalene (PEN), polyethylene, polyimide, polyamide, polyamideimide, liquid crystal polymer, and cycloolefin polymer, as well as polymer films. Examples of metal materials include stainless steel, aluminum, titanium, and silicon.

[0038] There are no particular limitations on the thickness of the light-transmitting substrate 21 as long as it can support the light-transmitting conductive layer 22, the power generation layer 23, and the electrodes 24, and the thickness may be, for example, 10 μm or more and 300 μm or less.

[0039] The light-transmitting base material 21 is a base material that is required in the manufacturing process of the power generating cell 20, but is not necessarily a necessary component. The light-transmitting base material 21 may be used, for example, only during the manufacturing process of the solar power generation device 5, or may be removed after or during the manufacturing process. When removed, a base material that does not have light-transmitting properties may be used instead of the light-transmitting base material 21.

[0040] (Transparent conductive layer 22) The transparent conductive layer 22 is a layer having electrical conductivity and functions as a cathode. The transparent conductive layer 22 has light transmitting properties. The transparent conductive layer 22 is preferably transparent.

[0041] Examples of the transparent conductive layer 22 include transparent materials such as indium tin oxide (ITO), fluorine-doped tin oxide (FTO), NESA film, etc. The transparent conductive layer 22 is formed on the surface of the transparent substrate by, for example, a sputtering method, an ion plating method, a plating method, a coating method, etc.

[0042] The light-transmitting conductive layer 22 may be configured to have light-transmitting properties by forming a light-transmitting pattern using an opaque material. Examples of the opaque material include platinum, gold, silver, copper, aluminum, rhodium, indium, titanium, nickel, tin, zinc, and alloys containing these. Examples of the light-transmitting pattern include a lattice shape, a line shape, a wavy line shape, a honeycomb shape, and a round hole shape.

[0043] The thickness of the transparent conductive layer 22 is preferably, for example, 30 nm or more and 300 nm or less. When the transparent conductive layer 22 is 30 nm or more and 300 nm or less, good conductivity can be obtained while maintaining high flexibility.

[0044] (Power Generation Layer 23) The power generation layer 23 is a layer that causes photoelectric conversion by irradiation with light, and generates electrons and holes from excitons generated by absorbing light. As shown in Fig. 5(B), the power generation layer 23 includes a hole transport layer 30, a photoelectric conversion layer 31, and an electron transport layer 32. The hole transport layer 30, the photoelectric conversion layer 31, and the electron transport layer 32 are stacked in this order along the direction from the translucent conductive layer 22 toward the electrode 24.

[0045] (Hole transport layer 30) The hole transport layer 30 extracts holes generated in the photoelectric conversion layer 31 to the light-transmitting conductive layer 22, and prevents electrons generated in the photoelectric conversion layer 31 from moving to the light-transmitting conductive layer 22. For example, a metal oxide can be used as the material of the hole transport layer 30. For example, titanium oxide, molybdenum oxide, vanadium oxide, zinc oxide, nickel oxide, lithium oxide, calcium oxide, cesium oxide, aluminum oxide, etc. may be used as the metal oxide. In addition, delafossite type compound semiconductor (CuGaO2), copper oxide, copper thiocyanate (CuSCN), vanadium pentoxide (VO5), graphene oxide, etc. may also be used. In addition, a p-type organic semiconductor or a p-type inorganic semiconductor may also be used as the material of the hole transport layer 30.

[0046] The thickness of the hole transport layer 30 is, for example, preferably 1 nm to 1000 nm, more preferably 10 nm to 500 nm, and even more preferably 10 nm to 50 nm. If the thickness of the hole transport layer 30 is 1 nm to 1000 nm, the transport of holes can be realized.

[0047] (Photoelectric conversion layer 31) The photoelectric conversion layer 31 (photoactive layer) is a layer that converts absorbed light into electricity. There are no particular limitations on the material of the photoelectric conversion layer 31 as long as it can convert absorbed light into electricity, and for example, amorphous silicon, perovskite, non-silicon-based materials (semiconductor material CIGS), etc. are used. The photoelectric conversion layer 31 may also have a tandem-type laminated structure that combines these materials. The photoelectric conversion layer 31 using a non-silicon-based material uses the semiconductor material CIGS containing copper (Cu), indium (In), gallium (Ga), and selenium (Se), which makes it easy to reduce the thickness of the photoelectric conversion layer.

[0048] In the following, a photoelectric conversion layer using perovskite will be described as an example of the photoelectric conversion layer 31. The photoelectric conversion layer 31 containing a perovskite compound has an advantage that the dependency of the power generation efficiency on the angle of incident light (hereinafter, sometimes referred to as the incidence angle dependency) is relatively low. As a result, in this embodiment, a higher power generation efficiency can be obtained.

[0049] A perovskite compound is a structure having a perovskite crystal structure or a crystal similar thereto. The perovskite crystal structure is represented by the composition formula ABX3. In this composition formula, for example, A represents an organic cation, B represents a metal cation, and X represents a halogen anion. However, the A site, B site, and X site are not limited to these.

[0050] The organic group of the organic cation constituting the A site is not particularly limited, and examples thereof include alkylammonium derivatives, formamidinium derivatives, etc. The organic cation constituting the A site may be of one type or of two or more types.

[0051] The metal of the metal cation constituting the B site is not particularly limited, and examples thereof include Cu, Ni, Mn, Fe, Co, Pd, Ge, Sn, Pb, Eu, etc. The metal cation constituting the B site may be one type or two or more types.

[0052] The halogen of the halogen anion constituting the X site is not particularly limited, and examples thereof include F, Cl, Br, and I. The halogen anion constituting the X site may be of one type or of two or more types.

[0053] The thickness of the photoelectric conversion layer 31 is, for example, preferably 1 nm or more and 1,000,000 nm or less, more preferably 100 nm or more and 50,000 nm or less, and further preferably 300 nm or more and 1,000 nm or less. When the thickness of the photoelectric conversion layer 31 is 1 nm or more and 1,000,000 nm or less, the photoelectric conversion efficiency is improved.

[0054] (Electron transport layer 32) The electron transport layer 32 extracts electrons generated in the photoelectric conversion layer 31 to the electrode 24, and prevents holes generated in the photoelectric conversion layer 31 from moving to the electrode 24. The electron transport layer 32 preferably contains, for example, either a halogen compound or a metal oxide.

[0055] Examples of halogen compounds include lithium halides (LiF, LiCl, LiBr, LiI) and sodium halides (NaF, NaCl, NaBr, NaI). Examples of elements constituting metal oxides include titanium, molybdenum, vanadium, zinc, nickel, lithium, potassium, cesium, aluminum, niobium, tin, and barium. In addition, an n-type organic semiconductor or an n-type inorganic semiconductor can also be used as the material of the electron transport layer 32.

[0056] The thickness of the electron transport layer 32 is, for example, preferably 1 nm or more and 1000 nm or less, more preferably 10 nm or more and 500 nm or less, and even more preferably 10 nm or more and 50 nm or less. If the thickness of the electron transport layer 32 is 1 nm or more and 1000 nm or less, electron transport can be realized.

[0057] (electrode 24) The electrode 24 is conductive and functions as an anode. The electrode 24 can extract electrons from the photoelectric conversion layer 31 in response to the photoelectric conversion caused by the photoelectric conversion layer 31. The electrode 24 may be light-transmitting or may be made of a non-light-transmitting material. Examples of materials for the electrode 24 include platinum, gold, silver, copper, aluminum, rhodium, indium, titanium, nickel, tin, zinc, and alloys containing these metals.

[0058] (Barrier sheet 11) The barrier sheet 11 is disposed on the opposite side to the back sheet 6 in the thickness direction of the solar power generation device 5. The barrier sheet 11 includes a light receiving surface of the solar power generation device 5. The barrier sheet 11 is light transmissive. The barrier sheet 11 is preferably transparent. The barrier sheet 11 has a barrier property against water vapor and a protective property against external forces.

[0059] The barrier sheet 11 is flexible. The material used for the barrier sheet 11 preferably has a modulus of longitudinal elasticity (modulus of longitudinal elasticity) of 100 Pa or more and 10,000 MPa or less, and more preferably 1,000 MPa or more and 5,000 MPa or less. Specific examples of the material for the barrier sheet 11 include plastic films, vinyl films, etc.

[0060] The thickness of the barrier sheet 11 is preferably 50 μm or more, and more preferably 100 μm or more. The thickness of the barrier sheet 11 is preferably 2000 μm or less, and more preferably 1000 μm or less. When the thickness of the barrier sheet 11 is 50 μm or more and 2000 μm or less, the bending strength of the solar power generation device 5 can be easily set to 50 MPa or more and 150 MPa or less.

[0061] (Sealant 12) The sealant 12 is filled between the barrier sheet 11 and the back sheet 6 with the power generation layer 23 disposed between the barrier sheet 11 and the back sheet 6. The sealant 12 prevents water from entering the power generation layer 23 from around the power generation layer 23. The sealant 12 is translucent and is preferably transparent. It is not necessary for the sealant 12 to cover the entire power generation section 10. For example, if a part of the power generation section 10 is exposed from the sealant 12, the exposed part may be covered with a sealing edge material 13 or the like.

[0062] Examples of materials for the sealant 12 include ethylene vinyl acetate (EVA), polyolefin, butyl rubber, silicone resin, polyvinyl butyral, acrylic resin, polyisobutylene resin, SBS resin, SIBS resin, and epoxy resin.

[0063] The transverse elastic modulus of the sealant 12 is preferably 0.01 to 500 MPa, more preferably 0.05 to 250 MPa, and even more preferably 0.1 to 100 MPa. In this manner, the sealant 12 deforms in the planar direction in response to thermal expansion and contraction caused by the temperature difference between the back sheet 6 and the barrier sheet 11. This makes it possible to prevent the back sheet 6 and the barrier sheet 11 from peeling off from the sealant 12 due to shear stress caused by thermal expansion and contraction. The "transverse elastic modulus" referred to in this application is a value calculated from the longitudinal elastic modulus (longitudinal elastic modulus) and Poisson's ratio obtained by, for example, a tensile test method.

[0064] From another viewpoint, the viscosity of the sealant 12 can also be specified. The viscosity of the sealant 12 is preferably 11000 mPa·S or more and 700000 mPa·S or less, more preferably 26000 mPa·S or more and 450000 mPa·S or less, and even more preferably 40000 mPa·S or more and 110000 mPa·S or less.

[0065] In this case, examples of the material of the sealant 12 include polyolefin, butyl rubber, silicone resin, polyvinyl butyral, acrylic resin, polyisobutylene resin, etc. In this specification, the "viscosity" is a value measured at an environmental temperature of 23°C in accordance with the rotational viscometer method of JIS Z8803.

[0066] The back sheet 6 and the barrier sheet 11 are bonded via the sealant 12, and the adhesive strength is preferably 0.1 N / 10 mm or more and 10 N / 10 mm or less in a peel test. In particular, when the solar power generation device 5 is installed in a bent state, the shear stress generated in the solar power generation device 5 becomes larger, so by adopting an adhesive strength in the above range in the peel test, peeling can be effectively suppressed for a long period of time. The peel test is performed in accordance with JIS Z 0237.

[0067] From the viewpoint of enhancing the effect of preventing peeling, the thickness of the sealant 12 is preferably 10 μm or more, more preferably 30 μm or more, and even more preferably 50 μm or more. On the other hand, the thickness of the sealant 12 is preferably 300 μm or less, more preferably 200 μm or less, and even more preferably 100 μm or less. By making the thickness of the sealant 12 10 μm or more, it is possible to sufficiently secure the escape allowance for the shear stress during thermal expansion and contraction. By making the thickness of the sealant 12 300 μm or less, it is possible to reduce the weight of the solar power generation device 5, thereby improving the workability and workability.

[0068] (Sealing edge material 13) The sealing edge material 13 seals the gap between the outer peripheral edge 14 of the back sheet 6 and the outer peripheral edge 15 of the barrier sheet 11 with the power generating cells 20 and the sealant 12 disposed between the back sheet 6 and the barrier sheet 11. The outer peripheral edge of the solar power generation device 5 is formed by the sealing edge material 13. As shown in FIG. 5(A), the sealing edge material 13 includes a first adhesive portion 40, a second adhesive portion 41, and a sealing portion 42 connecting the first adhesive portion 40 and the second adhesive portion 41. The first adhesive portion 40 is adhered to the front surface (upper surface in the figure) of the barrier sheet 11. The second adhesive portion 41 is adhered to the rear surface (lower surface in the figure) of the back sheet 6. The first adhesive portion 40, the sealing portion 42, and the second adhesive portion 41 are integrally formed.

[0069] Examples of the material for the sealing edge material 13 include tape materials made of butyl rubber, silicone rubber, and the like.

[0070] In this embodiment, the sealing edge material 13 is not necessarily required. For example, instead of the sealing edge material 13, the edge of the barrier sheet 11 may be folded toward the back sheet 6 and the folded tip may be joined to the back sheet 6. This makes the sealing edge material 13 unnecessary.

[0071] (Action of the solar power generation device 5) According to the above-described solar power generation device 5, when light is irradiated onto the solar power generation device 5 from the front side (barrier sheet 11 side), the photoelectric conversion layer 31 of the power generation layer 23 absorbs the light and performs photoelectric conversion, generating electrons and holes in the photoelectric conversion layer 31. The electrons are extracted to the electrode 24 (anode) via the electron transport layer 32, and the holes are extracted to the translucent conductive layer 22 (cathode) via the hole transport layer 30, causing a current to flow from the translucent conductive layer 22 to the electrode 24 (i.e., power generation is performed).

[0072] In the photoelectric conversion unit constituting the power generation section 10, an extension 24a is provided on the electrode 24 (anode) of each power generation cell 20 (FIG. 5(C)). The extension 24a of the electrode 24 extends toward the translucent conductive layer 22 (cathode). In two adjacent power generation cells 20, 20, the extension 24a of the electrode 24 of one cell 20 is joined to the translucent conductive layer 22 of the other cell 20. Due to this joining, while the solar power generation device 5 is irradiated with light, a current flows from the translucent conductive layer 22A at one end of the power generation section 10 (photoelectric conversion unit) to the electrode 24A at the other end of the power generation section 10 (the current flow is indicated by an arrow in FIG. 5(C)). The current is taken out via a power distribution line (not shown).

[0073] By configuring the power generation section 10 from the above-mentioned photoelectric conversion unit, even if a malfunction occurs in some of the power generation cells 20, the amount of electricity extracted from the power generation section 10 can be stabilized.

[0074] Instead of providing the extension 24a on the electrode 24 (anode) of each power generating cell 20, an extension extending toward the electrode 24 (anode) may be provided on the translucent conductive layer 22 (cathode) of each power generating cell 20. In this case, between two adjacent power generating cells 20, 20, the extension of the translucent conductive layer 22 of one cell 70 is joined to the electrode 24 of the other cell 70. In this manner, the same effect as above can be obtained.

[0075] Furthermore, when the power generation section 10 is provided with a translucent base material 21, from the viewpoint of facilitating the manufacture of the power generation section 10, it is preferable to support the translucent conductive layer 22, the power generation layer 23 and the electrodes 24 of each power generation cell 20 on a common translucent base material 21, as shown in Figure 5 (C).

[0076] Furthermore, when the power generating section 10 is composed of one power generating cell 20, the current flowing from the electrode 24 to the translucent conductive layer 22 is taken out via a power distribution line.

[0077] The solar power generation device 5 may include a plurality of power generation units 10. In this case, the plurality of power generation units 10 are arranged in the planar direction of the solar power generation device 5 and are electrically connected in series or in parallel.

[0078] When the power generation sections 10 are composed of photoelectric conversion units, in order to connect a plurality of power generation sections 10 in series, the translucent conductive layer 22A at an end of one of the power generation sections 10 and the electrode 24A at an end of the other power generation section 10 are connected via a power distribution line in two adjacent power generation sections 10, 10. When connecting a plurality of power generation sections 10 in parallel, the translucent conductive layers 22A, 12A at the ends of two adjacent power generation sections 10, 10 and the electrodes 24A, 24A at the ends of the two adjacent power generation sections 10, 10 are connected via power distribution lines, respectively.

[0079] Furthermore, when the power generation unit 10 is composed of one power generation cell 20, in order to connect a plurality of power generation units 10 in series, the translucent conductive layer 22 of one of the power generation units 10 and the electrode 24 of the other power generation unit 10 are connected via a power distribution line in two adjacent power generation units 10, 10. When connecting a plurality of power generation units 10 in parallel, the translucent conductive layers 22, 12 of two adjacent power generation units 10, 10 and the electrodes 24, 14 of the two adjacent power generation units are connected via power distribution lines, respectively.

[0080] Whether the power generation section 10 is composed of the above-mentioned photoelectric conversion unit or one power generation cell 20, the distance between adjacent power generation sections 10, 10 may be more than 0 mm, and is preferably 2 mm or more, more preferably 10 mm or more, and even more preferably 15 mm or more. The distance between adjacent power generation sections 10, 10 is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 20 mm or less.

[0081] (Fiber-containing sheet 3) The fiber-containing sheet 3 constituting the installation surface is a sheet containing fiber and has a light-shielding property. The fiber-containing sheet 3 blocks sunlight, thereby preventing vegetation from growing on the ground 2. The tensile strength of the fiber-containing sheet 3 is preferably 1 N / cm or more and 10,000 N / cm or less. The thickness of the fiber-containing sheet 3 is preferably, for example, 0.1 mm or more and 100 mm or less.

[0082] A fiber-reinforced sheet in which the periphery of the fibers is covered with a resin, or a nonwoven fabric can be used as the fiber-containing sheet 3. In this case, examples of the material of the fibers contained in the fiber-containing sheet 3 include polyethylene, polypropylene, polyester, polylactic acid, polyolefin, asphalt, and silica sand.

[0083] (Elastic body 4) The elastic body 4 is a sheet formed from an elastic material. The transverse elastic modulus (transverse elastic modulus) of the elastic body 4 is preferably 0.05 MPa or more, more preferably 0.1 MPa or more, more preferably 0.5 MPa or more, more preferably 1 MPa or more, more preferably 5 MPa or more, and more preferably 10 MPa or more. The transverse elastic modulus (transverse elastic modulus) of the elastic body 4 is preferably 1000 MPa or less, more preferably 500 MPa or less, more preferably 400 MPa or less, more preferably 300 MPa or less, more preferably 200 MPa or less, more preferably 100 MPa or less, and more preferably 50 MPa or less. The viscosity of the elastic body 4 is preferably 0.1 Pa·s or more, more preferably 0.5 Pa·s or more, more preferably 1 Pa·s or more, more preferably 10 Pa·s or more, more preferably 100 Pa·s or more, and more preferably 500 Pa·s or more. The viscosity of the elastic body 4 is preferably 10000 Pa·s or less, more preferably 5000 Pa·s or less, more preferably 4000 Pa·s or less, more preferably 3000 Pa·s or less, more preferably 2000 Pa·s or less, more preferably 1000 Pa·s or less, and more preferably 800 Pa·s or less. As an elastic material for forming the elastic body 4, for example, a resin composition containing at least one selected from vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin, cyanoacrylate resin, acrylic resin, chloroprene rubber, styrene, butadiene rubber, polyurethane resin, silicone resin, and modified silicone resin can be used. The thickness of the elastic body 4 is preferably, for example, 0.1 mm or more and 100 mm or less.

[0084] The elastic body 4 is adhered to the upper surface (installation surface) of the fiber-containing sheet 3 using an adhesive 40, and is fixed in a state in which it is placed on the upper surface (installation surface) of the fiber-containing sheet 3.

[0085] The adhesive 40 may be, for example, a resin composition containing at least one selected from vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin, cyanoacrylate resin, acrylic resin, chloroprene rubber, styrene, butadiene rubber, polyurethane resin, silicone resin, and modified silicone resin. Note that the present invention does not limit the adhesive 40 to the above-mentioned resin composition. In addition, the adhesive preferably has a viscosity of 800 cP or more, but the viscosity of the adhesive may be less than 800 cP.

[0086] As long as the back sheet 6 and the installation surface 3 can be bonded via the elastic body 4, the elastic body 4 does not necessarily have to be in a sheet shape, and the elastic body 4 may be shaped to partially bond the back sheet 6 to the installation surface 3 (for example, the elastic body 4 may be shaped to bond only the peripheral portion of the back sheet 6 to the installation surface 3). From the viewpoint of actively deforming the elastic body 4 in accordance with the deformation of the back sheet 6 due to thermal expansion and contraction, it is preferable that the back sheet 6 and the installation surface 3 are bonded only via the elastic body 4. On the other hand, in consideration of workability, from the viewpoint of achieving temporary temporary fixation, fixation with relatively weak strength, and partial fixation, a member other than the elastic body 4 may be provided to bond the back sheet 6 and the installation surface 3, but in this case, it is necessary to consider that the member other than the elastic body 4 does not hinder the deformation of the back sheet. An elastic body may be provided as a coating / adhesive layer on the installation surface or the back of the back sheet of the solar power generation device, and the two may be bonded to each other. In addition, an adhesive elastic resin that serves both as the adhesive 40 and the elastic body 4 may be provided on the laminate 1.

[0087] The ratio (Eb / Ea) of the transverse elastic modulus Ea of the back sheet to the transverse elastic modulus Eb of the elastic body 4 is preferably 0.002 or more, more preferably 0.004 or more, more preferably 0.006 or more, more preferably 0.008 or more, more preferably 0.01 or more, more preferably 0.015 or more, more preferably 0.02 or more, more preferably 0.03 or more. The ratio (Eb / Ea) is preferably 0.1 or less, more preferably 0.05 or less, more preferably 0.045 or less, more preferably 0.04 or less, more preferably 0.035 or less.

[0088] (Action and effect) According to the laminate 1 and the solar power generation system 100 of this embodiment, the elastic body 4 is disposed between the fiber-containing sheet 3 and the back sheet 6, and the elastic body 4 is deformed three-dimensionally in response to thermal expansion and contraction of the fiber-containing sheet 3 and the back sheet 6 due to temperature changes (i.e., on the fiber-containing sheet 3 side of the elastic body 4, deformation occurs according to the thermal expansion and contraction of the fiber-containing sheet 3, and on the back sheet 6 side of the elastic body 4, deformation occurs according to the thermal expansion and contraction of the back sheet 6). This makes it possible to avoid the generation of large shear stress between the sheets (corresponding to between the fiber-containing sheet 3 and the elastic body 4 or between the elastic body 4 and the back sheet 6), so that the sheets 3 and 6 are unlikely to peel off. Therefore, according to the laminate 1 and the solar power generation system 100, gaps are unlikely to occur between the fiber-containing sheet 3 and the back sheet 6 that constitute the installation surface, and the solar power generation device 5 can be stably fixed for a long period of time.

[0089] From the viewpoint of suppressing the stress generated in the laminate 1 due to thermal expansion and contraction, the longitudinal elastic modulus of the elastic body 4 is preferably 0.1 MPa or more, more preferably 1 MPa or more, more preferably 10 MPa or more, and even more preferably 100 MPa or more. In addition, the longitudinal elastic modulus is preferably 1000 MPa or less, more preferably 500 MPa or less, and more preferably 250 MPa or less. From the viewpoint of suppressing the generated stress, it is preferable to lower the longitudinal elastic modulus of the elastic body 4, but since the shape retention force of the elastic body 4 decreases as the longitudinal elastic modulus of the elastic body 4 decreases, it is preferable that the longitudinal elastic modulus of the elastic body 4 is 0.1 MPa or more as described above. Furthermore, since the stress generated in the elastic body 4 increases as the longitudinal elastic modulus of the elastic body 4 increases, it is preferable that the longitudinal elastic modulus of the elastic body 4 is 1000 MPa or less as described above.

[0090] It is also preferable that the linear expansion coefficient of the elastic body 4 is greater than that of the fiber-containing sheet 3 and less than that of the back sheet 6. In this way, the shear stress generated between the sheets can be kept small. In this case, the linear expansion coefficient of the fiber-containing sheet 3 is set to 1×10 -6 / ℃ or more 1000×10 -6 ° C. or less, and the linear expansion coefficient of the elastic body 4 is preferably 10×10 -6 / ℃ or more 1000×10 -6 ° C. or less and smaller than the linear expansion coefficient of the back sheet 6.

[0091] From the viewpoint of stably maintaining the bond between the fiber-containing sheet 3 and the elastic body 4 via the elastic body 4, it is preferable that the shear peel strength between the fiber-containing sheet 3 and the back sheet 6 via the elastic body 4 is 0.1 N / cm or more. The above shear peel strength is a value measured by the method of JIS K6850, and the above shear peel strength of 0.1 N / cm or more can be achieved, for example, by appropriately selecting the materials of the fiber-containing sheet 3 and the adhesive 40. When measuring the above shear peel strength, it is preferable to measure at an environmental temperature higher than the usage environment temperature, and it is preferable to measure at an environmental temperature such as 90°C. On the other hand, when it is clear that the usage environment temperature is a constant low temperature, it is preferable to measure near the usage environment temperature.

[0092] (Modification) The present invention is not limited to the above-described embodiment, and various modifications can be made. Modifications of the present invention will be described below (in the following, the same reference numerals as in the above-described embodiment are used for configurations common to the above-described embodiment, and detailed descriptions thereof will be omitted).

[0093] For example, the solar power generation system of the present invention can be modified as shown in FIG. 6. The solar power generation system 200 shown in FIG. 6 is laid on the ground 2 and includes a fiber-containing sheet 3 constituting an installation surface, an elastic body 4, and a solar power generation device 5. The solar power generation system 200 is partially configured by a laminate 201, and the laminate 201 includes the fiber-containing sheet 3, the elastic body 4, and a back sheet 6 constituting the bottom of the solar power generation device 5. In the solar power generation system 200, the elastic body 4 is bonded to the upper surface (installation surface) of the fiber-containing sheet 3 using an adhesive 40, and the back sheet 6 is bonded to the upper surface of the elastic body 4 using an adhesive 8. In addition, the tip side of a stake 202 penetrating the solar power generation device 5, the elastic body 4, and the fiber-containing sheet 3 is embedded in the ground, thereby fixing the solar power generation device 5, the elastic body 4, and the fiber-containing sheet 3. As a result, the positions of the fiber-containing sheet 3, the elastic body 4, and the solar power generation device 5 are stably maintained.

[0094] The solar power generation system of the present invention can be modified as shown in Fig. 7. The solar power generation system 300 shown in Fig. 7 is laid on the ground 2, and includes a fiber-containing sheet 3 constituting an installation surface, an elastic body 301, and a solar power generation device 5. A part of the solar power generation system 300 is formed of a laminate 302, and the laminate 302 includes the fiber-containing sheet 3, the elastic body 301, and a back sheet 6 constituting the bottom of the solar power generation device 5.

[0095] The elastic body 301 is formed from a material having elasticity and adhesiveness. Since the elastic body 301 has adhesiveness, the elastic body 301 is fixed in a state in which it is placed on the upper surface (installation surface) of the fiber-containing sheet 3, and the back sheet 6 is fixed in a state in which it is placed on the upper surface of the elastic body 301. As a material for the elastic body 301, for example, a resin composition containing at least one selected from vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin, cyanoacrylate resin, acrylic resin, chloroprene rubber, styrene, butadiene rubber, polyurethane resin, silicone resin, and modified silicone resin can be used. The thickness of the elastic body 301 is, for example, 0.1 mm or more, preferably 1 mm or more, and more preferably 5 mm or more, and 100 mm or less, more preferably 50 mm or less, and even more preferably 10 mm or less. In addition, from the viewpoint of maintaining a stable bond between the fiber-containing sheet 3 and the back sheet 6 via the elastic body 301, it is preferable that the shear peel strength between the fiber-containing sheet 3 and the back sheet 6 via the elastic body 301 is 0.1 N / cm or more (the above shear peel strength is a value measured by the method of JIS K6850).

[0096] According to the laminate 302 and the photovoltaic power generation system 300, the elastic body 301 disposed between the fiber-containing sheet 3 and the back sheet 6 has elasticity, so that the elastic body 301 undergoes three-dimensional deformation in response to thermal expansion and contraction of the fiber-containing sheet 3 and the back sheet 6 due to temperature changes (i.e., on the fiber-containing sheet 3 side of the elastic body 301, deformation occurs in response to thermal expansion and contraction of the fiber-containing sheet 3, and on the back sheet 6 side of the elastic body 301, deformation occurs in response to thermal expansion and contraction of the back sheet 6). This makes it difficult for gaps to occur between the sheets (corresponding to between the fiber-containing sheet 3 and the elastic body 301 or between the elastic body 301 and the back sheet 6), and the photovoltaic power generation device 5 can be stably fixed for a long period of time. In addition, the elastic body 301 has adhesiveness, so that the fiber-containing sheet 3, the elastic body 301, and the back sheet 6 can be easily joined together. In the illustrated example, a pile 303 is used that penetrates the solar power generation device 5, the elastic body 301, and the fiber-containing sheet 3 and is driven into the ground, but the pile 303 may be omitted and a pile 7 that penetrates the fiber-containing sheet 3 and is driven into the ground may be used, as in the example of Figure 4.

[0097] In the illustrated solar power generation systems 100, 200, 300 (FIGS. 3, 4, 6, 7), three sets of "elastic body 4 or 301 and solar power generation device 5" are provided on one fiber-containing sheet 3, but a plurality of sets other than three of "elastic body 4 or 301 and solar power generation device 5" may be provided on one fiber-containing sheet 3. Also, one set of "elastic body 4 or 301 and solar power generation device 5" may be provided on one fiber-containing sheet 3. When a plurality of sets of "elastic body 4 or 301 and solar power generation device 5" are provided on one fiber-containing sheet 3, each of the laminates 1, 201, 302 includes one fiber-containing sheet 3, a plurality of elastic bodies 4 or 301 placed on the upper surface of the one fiber-containing sheet 3, and a back sheet 6 placed on the upper surface of each elastic body 4 or 301. Furthermore, when a set of "elastic body 4 or 301 and solar power generation device 5" is provided on one fiber-containing sheet 3, the laminates 1, 201, 302 each comprise one fiber-containing sheet 3, one elastic body 4 or 301 placed on the upper surface of the one fiber-containing sheet 3, and one back sheet 6 placed on the upper surface of the one elastic body 4 or 301.

[0098] 3, 4, 6, and 7 show an example in which the solar power generation systems 100, 200, and 300 are laid on the ground 2, but the solar power generation systems 100, 200, and 300 may be laid on the surface of a roof. In this case, the laminate 1 constituting the solar power generation system 100, the laminate 201 constituting the solar power generation system 200, and the laminate 302 constituting the solar power generation system 300 are provided with a fiber-containing sheet 3 placed on the surface of the roof, an elastic body 4 or 301 placed on the upper surface (installation surface) of the fiber-containing sheet 3, and a back sheet 6 of the solar power generation device 5 placed on the upper surface of the elastic body 4 or 301. For example, the fiber-containing sheet 3 is fixed to the surface of the roof using a stake or the like that penetrates the fiber-containing sheet 3 and has its tip embedded in the roof. Alternatively, the above-mentioned stake may be omitted, and the tip of the stake that penetrates the solar power generation device 5, the elastic body 4, and the fiber-containing sheet 3 may be embedded in the roof. The elastic body 4 included in the laminate 1, 201 (FIGS. 4 and 6) is fixed in a state in which it is placed on the upper surface of the fiber-reinforced sheet 3 by being adhered to the upper surface of the fiber-reinforced sheet 3 using an adhesive 40. The back sheet 6 included in the laminate 1, 201 (FIGS. 4 and 6) is fixed in a state in which it is placed on the upper surface of the elastic body 4 by being adhered to the upper surface of the elastic body 4 using an adhesive 8. In the laminate 302 (FIG. 7), the elastic body 301 has adhesiveness, so that the elastic body 301 is fixed in a state in which it is placed on the upper surface of the fiber-containing sheet 3, and the back sheet 6 is fixed in a state in which it is placed on the upper surface of the elastic body 301.

[0099] The installation surface 3 may be a surface parallel to a horizontal plane (a surface perpendicular to the direction in which gravity acts) or may be a surface intersecting the horizontal plane at an angle. The installation surface 3 intersecting the horizontal plane at an angle includes an inclined surface that forms a predetermined inclination angle θ (0°<θ<90°) with respect to the horizontal plane and a vertical surface perpendicular to the horizontal plane. The installation surface 3 may be a flat surface or a curved surface, and the surface state may be smooth or may be rough or have irregularities. The installation surface 3 is formed of, for example, metal, hard or soft resin, asphalt, concrete, ceramic, etc. In the case where the surface has irregularities, the maximum bending radius of the solar power generation device 5 is preferably 50 mm or more, more preferably 75 mm or more, and even more preferably 100 mm or more. By setting the bending radius to the above or more, the solar power generation device 5 can be adapted to various installation surfaces while suppressing damage to the solar power generation device 5.

[0100] The installation surface 3 may also be formed by the surface of a building material. Examples of building materials include roofing materials, wall materials (metal siding materials, ceramic siding materials, sandwich panels, etc.), partitions, door materials, fence materials, flooring materials, window glass, balconies, etc. Examples of roofing materials include roofing materials used for folded plate roofs, slate roofs, roof decks, tile roofing, vertical flat roofing, etc. The roof may be vertically or horizontally roofed.

[0101] The method of mounting on the roof can be selected according to the type of installation on the roof and the design of the roof. Installation on the roof may involve lifting the rolled solar power generation device 5 onto the roof and then unfolding it to install it. Alternatively, the rolled solar power generation device 5 may be placed on the ground or on the outside of the roof, and the rolled solar power generation device 5 may be gradually pulled out from the roll body and pulled up onto the roof to install it.

[0102] The building in which the solar power generation device 5 is used may be a non-residential building or a residential building. Examples of non-residential buildings include stores, warehouses, factories, assembly halls, gymnasiums, and parking lots. Examples of residential buildings include wooden houses, steel-framed houses, reinforced concrete houses, and aluminum houses. However, among these, in the case of a non-residential building that is a large-scale building, it is preferable to make the solar power generation device 5 long. In this case, it is preferable that the longitudinal length of the solar power generation device 5 is three times or more the width direction length of the solar power generation device 5. For example, the longitudinal length of the solar power generation device 5 is 10 times or more, more specifically, 15 times or more, and even more specifically, 20 times or more, the width direction length. There is no particular limit to the lower limit of the longitudinal length of the solar power generation device 5, but it is preferable that it is, for example, 100 times or less, more specifically, 50 times or less, the width direction length.

[0103] 8 shows a solar power generation system 400 in which an installation surface 3 is constructed of an exterior material (a building material that forms the outer surface of a building) (hereinafter, the reference symbol 3 of the installation surface will be used as the reference symbol for the exterior material as appropriate). The exterior material 3 has a plurality of protrusions 51 extending in one direction, spaced apart in a direction perpendicular to the one direction. Examples of the exterior material 3 include roofing materials, wall materials (metal siding materials, ceramic siding materials, sandwich panels, etc.), partitions, door materials, and fence materials. In this embodiment, the exterior material 3 is a roofing material.

[0104] The solar power generation device 5 thus configured is bent at two points to correspond to the recessed corner formed by the valley portion 50 and the protrusion portion 51, as shown in Fig. 8. The solar power generation device 5 is flexible, so the bending work can be easily performed. The elastic body 4 or 301 (not shown) is placed on the exterior material 3 (installation surface) and fixed thereto. The back sheet (not shown) constituting the bottom of the solar power generation device 5 is placed on the upper surface of the elastic body 4 or 301 and fixed thereto.

[0105] The elastic body 4 or 301 (not shown) may be attached to the exterior material 3, and the solar power generation device 5 may be attached to the elastic body 4 or 301 (not shown) by adhesion, bolting, screwing, magnetic adhesion, pinning, or fixing with a dedicated metal fitting. An example of a dedicated metal fitting is a pair of rails extending in the water flow direction. The pair of rails is fixed to the upper end of the protrusion 51 of the exterior material 3, for example, and the end of the solar power generation device 5 and the end of the elastic body 4 or 301 (not shown) are inserted into the rails.

[0106] 8, the solar power generation device 5 has two bent portions 52. Therefore, compared to, for example, fixing one planar solar power generation device 5 to each flat surface (slope of convex portion 51, valley portion 50) of the exterior material 3, it is possible to provide at least the power generation section 10 in the portion corresponding to the bent portion 52, thereby improving power generation efficiency. On the other hand, as described above, even if the bent portion 52 is present, peeling at the interface between layers can be suppressed for a long period of time.

[0107] The bent portion 52 is a bent portion in the solar power generation device 5. The bent portion 52 may be bent, for example, as shown in Fig. 10, but is not limited thereto and may be curved. In this specification, "bent" refers to an aspect in which the radius of curvature at the inside corner is 10 mm or less. "Curved" refers to an aspect in which the radius of curvature at the inside corner is more than 10 mm.

[0108] The angle θ of the bent portion 52 may be smaller than 180°, but is, for example, 90° or more, more preferably 120° or more, and further preferably 160° or more. In the illustrated example, the solar power generation device 5 has two bent portions 52, but there may be one, or three or more. The "angle" here means the smaller of the two angles between two different surfaces.

[0109] The bent portion 52 may be formed by bending the planar solar power generation device 5 during installation, or may be formed in a shape that is bent in advance during manufacturing. Bending on-site can improve the degree of freedom in installation. By bending during manufacturing, shear stress occurs in the sealant of the front sheet and back sheet when they are bent and fixed, but this value can be minimized.

[0110] A cable is connected to the solar power generation device 5 for outputting electricity generated by the power generation unit 10 to an external device such as a power conditioner. The cable may be taken out from either the back sheet 6 or the barrier sheet 11, but from the viewpoint of improving the appearance, it is preferable that the cable be taken out from the back sheet 6. On the other hand, from the viewpoint of maintainability, it is preferable that the cable be taken out from the barrier sheet 11.

[0111] In the above-described photovoltaic power generation system 400, the transverse elastic modulus (modulus of transverse elasticity) of the sealant 12 is set to 500 MPa or less, or the viscosity of the sealant 12 is set to 11000 mPa·S or more and 700000 mPa·S or less, so that even if the barrier sheet 11 and the back sheet 6 expand or contract in the planar direction, peeling can be suppressed at the interface between the barrier sheet 11 and the sealant 12 and at the interface between the back sheet 6 and the sealant 12. For example, as shown in FIG. 10, when the photovoltaic power generation device 5 is bent toward the front side, the barrier sheet 11 may be compressed and the back sheet 6 may be stretched. At this time, a part of the barrier sheet 11 and a part of the back sheet 6 are displaced in the planar direction, so that the sealant 12 follows each of the barrier sheet 11 and the back sheet 6 as shown in FIG. 10(B). However, since the sealant 12 is easily deformed, peeling can be suppressed at the interface between each layer.

[0112] The peel strength of the back sheet 6 to the sealant 12 is preferably 0.1 N / mm or more, more preferably 0.5 N / mm or more, and even more preferably 0.8 N / mm or more. The peel strength of the barrier sheet 11 to the sealant 12 is preferably 0.1 N / mm or more, more preferably 0.5 N / mm or more, and even more preferably 0.8 N / mm or more.

[0113] The "peel strength" referred to here is the measurement result obtained in a 90° peel test conforming to JIS K6854-1. The 90° peel test is performed under the following conditions: peel speed: 300 mm / min, measurement temperature: room temperature (25°C), and atmosphere: atmospheric pressure.

[0114] By setting the peel strength of the back sheet 6 to the sealant 12 to be 0.1 N / mm or more as described above, peeling is unlikely to occur at the interface between the back sheet 6 and the sealant 12 even if an external force is applied to the back sheet 6.

[0115] Furthermore, since the peel strength of the barrier sheet 11 to the sealant 12 is 0.1 N / mm or more as described above, peeling at the interface between the barrier sheet 11 and the sealant 12 is less likely to occur even if an external force is applied to the barrier sheet 11.

[0116] Moreover, the above-mentioned solar power generation system 400 can be modified as shown in Fig. 11. In a solar power generation system 500 shown in Fig. 11, a back sheet 6 is made of a building board (hereinafter, the reference numeral 6 of the back sheet is used as the reference numeral of the building board as appropriate).

[0117] The building board 6 may be a roofing material, a wall material (metal siding material, ceramic siding material, sandwich panel, etc.), a partition, a door material, a fence material, etc. Examples of roofing materials include uneven roofing materials (uneven exterior materials) used for folded plate roofs, slate roofs, roof decks, tile roofing, vertical flat roofing, etc. The roof may be vertically or horizontally roofed. The building board 6 shown in FIG. 11 has the same shape as the exterior material 3 shown in FIG. 8 and FIG. 9, so a detailed description will be omitted.

[0118] The building board 6 is made of a metal plate. Examples of the metal plate include a painted steel plate, a stainless steel plate, an iron plate, a Galvalume steel plate (registered trademark), a copper plate, and an enamel plate.

[0119] The barrier sheet 11, the power generation section 10, and the sealant 12 are fixed to one surface of the building board 6. In this modification, the barrier sheet 11, the power generation section 10, and the sealant 12 are attached and fixed to the upper surface of the building board 6 to form a solar power generation device 5, as shown in Fig. 11(B) . In this modification, the barrier sheet 11, the power generation section 10, and the sealant 12 are fixed to one surface of the building board 6 by the self-adhesive force of the sealant 12.

[0120] Furthermore, in the above-described solar power generation device 5, since the back sheet 6 includes a building board, peeling at the interface can be suppressed even in the case of a building board with irregularities.

[0121] Furthermore, since the back sheet 6 includes a metal plate, the solar power generation device 5 can have high strength.

[0122] In the present invention, the members constituting the installation surface 3 are not limited to the above-mentioned building materials, and the installation surface 3 may be the ground (for example, the surface of a paved road or the slope of a mountain), the slope of a bank, or the surface of a structure such as an automobile, a train, or a ship. The material of the members constituting the installation surface 3 is also not particularly limited, and may be, for example, metal, hard resin, asphalt, or concrete.

[0123] The solar power generation system of the present invention can be modified as shown in Figs. 12 and 13. The solar power generation system 600 shown in Figs. 12 and 13 includes a cover member 60 on the frame of the solar power generation device 5. The cover member 60 has an ultraviolet ray blocking property, and has a shape in which one width side 61 and the other width side 62 are bent in the opposite direction to the width middle part 63. The cover member 60 is provided so that the one width side 61 is along the surface of the outer edge part 64 of the solar power generation device 5, the width middle part 63 is along the outer periphery 65 of the solar power generation device 5, and the other width side 62 is along the installation surface 3 on the outside of the solar power generation device 5, thereby covering the upper side of the outer edge part 64 of the solar power generation device 5 and the area between the outer periphery 65 of the solar power generation device 5 and the installation surface 3. The "outer edge part of the solar power generation device" means a part of the solar power generation device 5 having a predetermined width from the outer periphery 65 of the solar power generation device 5.

[0124] According to the above-described solar power generation system 600, the cover member 60 is provided with a "portion (corresponding to one widthwise side portion 61) covering the upper side of the outer edge portion 64 of the solar power generation device 5," so that even if a gap (not shown) occurs between the cover member 60 and the outer peripheral edge 65 of the solar power generation device 5 (even if the widthwise middle portion 63 of the cover member 60 is not in close contact with the outer peripheral edge 65), ultraviolet rays can be prevented from being irradiated onto the elastic body 4 or 301.

[0125] The material of the cover member 60 is not particularly limited as long as it has ultraviolet ray blocking properties, but for example, a frame made of a metal such as aluminum can be used as the cover member 60. When the cover member 60 is a metal frame, the cover member 60 is fixed to the installation surface 3 using bolts, adhesive, or the like.

[0126] As shown in FIG. 12, it is preferable to provide the cover member 60 so that the entire circumference of the solar power generation device 5 is surrounded by the cover member 60. In this way, deterioration of the entire elastic body 4 or 301 can be prevented. In order to surround the entire circumference of the solar power generation device 5 with the cover member 60, a linear cover member 60 may be provided for each side of the solar power generation device 5 as shown in FIG. 12, or a ring-shaped cover member 60 that surrounds the entire circumference of the solar power generation device 5 may be provided. The present invention does not exclude a case where the entire circumference of the solar power generation device 5 is not surrounded by the cover member 60 (i.e., a case where the cover member 60 is provided only on a part of the circumference of the solar power generation device 5). Even in this case, ultraviolet rays can be prevented from being irradiated to the elastic body 4 or 301 at the location where the cover member 60 is provided, so deterioration of the elastic body 4 or 301 can be prevented.

[0127] It is preferable that the cover member 60 presses the solar power generation device 5 moderately, and the contact pressure between the cover member 60 and the solar power generation device 5 is 0.5 MPa or more, more preferably 1 MPa or more, even more preferably 2.5 MPa or more, and 25 MPa or less, more preferably 15 MPa or less, even more preferably 10 MPa or less. The pressure may be measured using pressure-sensitive paper or the like. By setting the pressure within the above range, it is possible to reinforce the fixing of the solar power generation device 5 and suppress flapping of the ends of the solar power generation device 5 due to wind, etc., without inhibiting the deformation of the solar power generation device 5.

[0128] From the viewpoint of improving the watertightness from the edge of the solar power generation device 5, a continuous convex portion may be provided on the portion of the cover member 60 that comes into contact with the solar power generation device 5. The convex portion compresses the peripheral portion of the solar power generation device 5, and the contact pressure caused by the compression can improve the watertightness of the solar power generation device 5, allowing it to be installed stably for a longer period of time.

[0129] The crushing allowance of the solar power generation device 5 due to the convex portion is preferably 1% or more, more preferably 5% or more, and even more preferably 10% or more, and is 25% or less, more preferably 20% or less, and even more preferably 15% or less, when the thickness of the solar power generation device 5 is 100%.

[0130] By setting the thickness within the above range, deformation of the solar power generation device 5 is not hindered while the water stoppage property is appropriately improved.

[0131] The solar power generation system of the present invention can be modified as shown in Fig. 14 and Fig. 15. A solar power generation system 700 shown in Fig. 14 and Fig. 15 includes, in addition to an installation surface 3, an elastic body 4 or 301, and a solar power generation device 5, a plurality of fasteners 71 for fastening the solar power generation device 5 to a fixed object 70 constituting the installation surface 3. In the following, a case where the fixed object 70 is the ground will be described, but the present invention does not limit the fixed object 70 to the ground.

[0132] (fixture 71) Each of the fixing devices 71 is made of resin and includes a pressing portion 72 having a pressing surface 72a that presses the solar power generation device 5 against a fixing target 70 (ground), and an embedding portion 73 that is integral with the pressing portion 72 and has a portion 73a that is embedded in the fixing target 70 (ground). Examples of resin that can be used to form the fixing devices 70 include polyethylene, polyvinyl chloride, ABS, polypropylene, PPS, and polycarbonate.

[0133] From the viewpoint of suppressing damage to the photovoltaic power generation device 5 due to pressing of the pressing portion 72, it is preferable that the corner 72c between the pressing surface 72a and the side surface 72b of the pressing portion 72 has a rounded shape as shown in Figures 16(A) and 16(B). Alternatively, from the same viewpoint, the corner 72c between the pressing surface 72a and the side surface 72b of the pressing portion 72 may be chamfered as shown in Figures 17(A) and 17(B). In the above case, the ratio (r / T×100%) of the radius of curvature r (FIG. 16B) of the corner 72c to the thickness T of the pressing part 72 in the extension direction J of the embedded part 73, or the ratio (t1 / T×100%, t2 / T×100%) of the widths t1 and t2 (FIG. 17B) of the chamfer in the directions J and K to the thickness T is preferably 1% to 100%, more preferably 5% to 75%, and more preferably 10% to 50%. The width t1 of the chamfer means the width of the chamfer of the corner 72c in the extension direction J of the embedded part 73, and the width t2 of the chamfer means the width of the chamfer of the corner 72c in the direction K perpendicular to the extension direction J of the embedded part 73. The radius of curvature r or the widths t1 and t2 of the chamfer are preferably 0.1 mm or more and 15 mm or less, more preferably 0.5 mm or more and 10 mm or less, and even more preferably 1 mm or more and 5 mm or less.

[0134] Moreover, by the pressing portion 72 pressing the solar power generation device 5 in a planar manner (i.e., by the pressing surface 72a of the pressing portion 72 pressing the solar power generation device 5), the fixing force per unit area applied from the fixing device 70 to the solar power generation device 5 can be kept small. Therefore, damage to the solar power generation device 5 by the fixing device 70 can be suppressed. In order to reliably obtain this effect, it is preferable that the ratio (S2 / S1×100%) of the area S2 of the pressing surface 72a of each pressing portion 72 to the area S1 of the upper surface of the solar power generation device 5 is 0.1% or more, more preferably 1% or more, and further preferably 5% or more, and the ratio (ΣS2 / S1×100%) of the "total ΣS2 of the areas S2 of the pressing surfaces 72a of all pressing portions 72 provided in the solar power generation system 700" to the area S1 of the upper surface of the solar power generation device 5 is 5% or more, more preferably 10%, and further preferably 20%.

[0135] In order to reliably obtain the above-mentioned effects, the ratio (S2 / S4×100%) of the area S2 of the pressing surface 72a of each pressing portion 72 to the area S4 (S4=S1-ΣS3) obtained by subtracting the sum ΣS3 of the areas S3 of the power generating units 10 of the solar power generating device 5 from the area S1 of the upper surface of the solar power generating device 5 is preferably 10% or more, more preferably 50% or more, and even more preferably 80% or more. Note that it is not necessarily necessary to adjust the ratio (S2 / S1×100%) and the ratio (ΣS2 / S1×100%) to the above values ​​and adjust the ratio (S2 / S4×100%) to the above value at the same time, and it is acceptable to adjust only one of them.

[0136] As a means for improving the strength of the fixture 70, the material of the fixture 70 may be a composite reinforced material containing reinforcing fibers in a resin.

[0137] The material of the reinforcing fiber contained in the composite reinforcing material is not particularly limited, and examples thereof include glass fiber, carbon fiber, aramid fiber, and metal fiber. The fiber content is preferably 5% or more by volume, more preferably 15% or more, and more preferably 30% or more. This allows the fixing device 70 to have an appropriate strength. On the other hand, by setting the reinforcing fiber content to 80% or less by volume, more preferably 70% or less, and even more preferably 60% or less, the moldability can be imparted. The average fiber length of the reinforcing fiber is preferably 100% or less, more preferably 75% or less, and more preferably 50% or less of the diameter of the pressing parts 72, 71 (the maximum diameter when the diameter of the pressing part 72 changes in the stretching direction J). The diameter of the pressing part 72 refers to the diameter of the pressing part 72, if the cross-sectional shape of the pressing part 72 is circular, and refers to the diameter of the circumscribed circle of the cross-section of the pressing part 72 if the cross-sectional shape of the pressing part 72 is not circular.

[0138] Furthermore, the solar power generation system of the present invention can be modified as shown in Fig. 18 and Fig. 19. A solar power generation system 800 shown in Fig. 18 and Fig. 19 includes, in addition to an installation surface 3, an elastic body 4 or 301, and a solar power generation device 5, a fastener 81 for fastening the solar power generation device 5 to a fixed object 80. In the following, a case where the fixed object 80 is the ground will be described, but the fixed object 80 of the present invention is not limited to the ground.

[0139] (fixture 81) As shown in FIG. 19, the fixture 81 includes an exposed portion 82 exposed from the target 80, and an embedded portion 83 formed integrally with the exposed portion 82 and embedded in the target 80. The exposed portion 82 constitutes the installation surface 3, and is bonded to a surface 85 on the opposite side of the light receiving surface 84 of the solar power generation device 5 via an elastic body 4 or 301. FIG. 18 shows an example in which the fixtures 81 are provided at the four corners and the center of each side of the solar power generation device 5, but the number and positions of the fixtures 81 are not limited to the illustrated example. Any number of fixtures 81 may be provided at any position as long as the solar power generation device 5 can be fixed. A plurality of fixtures 81 may be provided at equal intervals in the longitudinal direction X and the width direction Y of the solar power generation device 5.

[0140] The material of the fastener 81 is not particularly limited, but it is preferable to form the fastener 81 using, for example, a resin. In this way, even if the fastener 81 is scattered, damage to the surrounding area caused by the fastener 81 can be suppressed. For example, polypropylene, polyvinyl chloride, and polyphenylene sulfide can be used as the resin for forming the fastener 81. The fastener 81 may also be formed using a fiber-reinforced resin. In addition, from the viewpoint of weather resistance, the color of the fastener 81 is preferably black.

[0141] (Buried part 83) The buried portion 83 extends downward from the center of gravity of the exposed portion 82, and is buried in the fixed object 80 (the ground). In this embodiment, the buried portion 83 has a cylindrical shape, but the shape of the buried portion 83 is not particularly limited as long as it can be buried in the fixed object 80. For example, the buried portion 83 may be a rectangular column.

[0142] As shown in Fig. 20(A) and Fig. 20(B), the embedded part 83 may include a cylindrical or plate-shaped main body part 86 extending from the exposed part 82, and one or more protruding parts 87 protruding in an annular shape from the outer circumferential surface of the main body part 86. When the embedded part 83 is provided with a plurality of protruding parts 87 as shown in Fig. 20(A), the plurality of protruding parts 87 are provided at intervals in the longitudinal direction of the main body part 86. When one protruding part 87 is provided as shown in Fig. 20(B), the protruding part 87 is provided, for example, at the end of the main body part 86 opposite to the exposed part 82 (the lower end part of the main body part 86). When the above-mentioned protruding part 87 is provided, it is preferable to increase the outer diameter of the protruding part 87 toward the exposed part 82 (upper side). In this way, it is possible to achieve both ease of insertion of the embedded part 83 into the fixed object 80 and difficulty of the embedded part 83 coming out of the fixed object 80.

[0143] 20(C), the embedded portion 83 may include a cylindrical main body portion 88 extending from the exposed portion 82, and a helical screw portion 89 formed on the outer circumferential surface of the main body portion 88. In this case, the embedded portion 83 is embedded in the fixed object 80 by screwing the embedded portion 83 into the fixed object 3.

[0144] 20(D), 20(E), 20(F), and 20(G), the embedded portion 83 may include a cylindrical main body 90 extending from the exposed portion 82. This can ensure a large contact area between the embedded portion 83 and the target 80, thereby improving the force with which the fixing device 81 fixes the solar power generation device 5 to the target 80.

[0145] 20(E), the embedded portion 83 may further include one or more protruding portions 91 protruding in an annular shape from the inner peripheral surface of the main body portion 90. As shown in FIG. 20(F), the embedded portion 83 may further include one or more protruding portions 92 protruding in an annular shape from the outer peripheral surface of the main body portion 90. As shown in FIG. 20(G), the embedded portion 83 may further include one or more protruding portions 91, 92 protruding in an annular shape from the inner peripheral surface and the outer peripheral surface of the main body portion 90. In this way, the force with which the fixing device 81 fixes the solar power generation device 5 can be further improved.

[0146] Furthermore, when protrusions 91 are provided on the inner circumferential surface of main body 90 (FIGS. 20(E) and 20(G)), it is preferable to provide protrusions 91 so that the inner diameter of protrusions 91 becomes smaller toward exposed portion 82 (upper side). Furthermore, when protrusions 92 are provided on the outer circumferential surface of main body 90 (FIGS. 20(F) and 20(G)), it is preferable to provide protrusions 92 so that the outer diameter of protrusions 92 becomes larger toward exposed portion 82 (upper side).

[0147] The length L of the embedded portion 83 is not particularly limited, but is preferably 10 mm or more, more preferably 25 mm or more, and more preferably 100 mm or more. The length L of the embedded portion 83 is preferably 500 mm or less, and more preferably 200 mm or less.

[0148] The portion of the buried portion 83 extending from the exposed portion 82 may be formed so that its diameter does not change in the stretching direction J, or may be formed so that its diameter gradually changes in the stretching direction J (for example, it may be formed so that the lower end is tapered). The above-mentioned "portion of the buried portion 83 extending from the exposed portion 82" corresponds to the entire buried portion 83 in the example of FIG. 19, and the main body portions 86, 88, and 90 in the examples of FIGS. 20(A), 20(B), 20(C), 20(D), 20(E), 20(F), and 20(G). The above-mentioned diameter refers to the diameter or outer diameter of the "portion of the buried portion 83 extending from the exposed portion 82" if it is columnar or cylindrical, and refers to the diameter of the circumscribing circle of the cross section of the "portion of the buried portion 83 extending from the exposed portion 82" if it is not columnar or cylindrical. The above-mentioned cross section refers to a cross section in a direction K perpendicular to the extension direction J of the embedded portion 83.

[0149] Furthermore, the diameter of the portion of embedded portion 83 extending from exposed portion 82 is not particularly limited, but is preferably 10 mm or more, and more preferably 15 mm or more. Furthermore, the diameter of the portion of embedded portion 83 extending from exposed portion 82 is preferably 200 mm or less, and more preferably 150 mm or less. When the cross section of embedded portion 83 changes in extension direction J, the above diameter means the maximum diameter of "the portion of embedded portion 83 extending from exposed portion 82."

[0150] (Exposed part 82) The exposed portion 82 is bonded to the lower surface of the back sheet 10, which forms the surface 85 of the solar power generation device 5, via the elastic body 4. The diameter of the exposed portion 82 at the lower end is larger than the above-mentioned "diameter of the portion of the buried portion 83 extending from the buried portion 82."

[0151] In the illustrated example, the cross-sectional shape of the exposed portion 82 is circular (FIGS. 18 and 21(A)), but the cross-sectional shape of the exposed portion 82 is not particularly limited as long as the exposed portion 82 can be bonded to the solar power generation device 5 by the elastic body 4. For example, the cross-sectional shape of the exposed portion 82 may be a hexagon (FIG. 21(B)), a square with sharp corners (FIG. 21(C)), a square with rounded corners (FIG. 21(D)), a cross shape (FIG. 21(E)), or a swastika shape (FIG. 21(F)). The cross-sectional shape of the exposed portion 82 refers to the shape of the cross section of the exposed portion 82 in a direction K perpendicular to the extension direction J of the embedded portion 83.

[0152] The diameter of the upper end of exposed portion 82 bonded to surface 85 of solar power generation device 5 is not particularly limited, but is preferably 30 mm or more, and more preferably 50 mm or more, from the viewpoint of widely and firmly bonding surface 85 of solar power generation device 5 to exposed portion 82. The diameter of exposed portion 82 at the upper end is preferably 500 mm or less, and more preferably 200 mm or less. Note that the above "diameter at the upper end of exposed portion 82" refers to the diameter of the cross section if the cross section at the upper end of exposed portion 82 (i.e., the upper surface of exposed portion 82) has a circular shape, and refers to the diameter of the circumscribing circle of the cross section if the cross section at the upper end of exposed portion 82 (i.e., the upper surface of exposed portion 82) is not circular.

[0153] The area of ​​the cross section at the upper end of the exposed portion 82 (i.e., the upper surface of the exposed portion 82) is not particularly limited, but is preferably 650 mm 2 More preferably, it is 2000 mm 2 The area of ​​the cross section at the upper end of the exposed portion 82 (i.e., the upper surface of the exposed portion 82) is not particularly limited, but is preferably 200,000 mm 2 More preferably, 20,000 mm 2 The following is the result.

[0154] The ratio between the above "diameter at the upper end of exposed portion 82" and the above "diameter of the portion of buried portion 83 extending from exposed portion 82 (maximum diameter if the diameter changes in extension direction J of buried portion 83)" is not particularly limited, but in order to widely and firmly bond surface 85 of solar power generation device 5 to exposed portion 82, the above "diameter at the upper end of exposed portion 82" is preferably 1.1 times or more, and more preferably 1.8 times or more, of the above "diameter of the portion of buried portion 83 extending from exposed portion 82". In addition, the above "diameter at the upper end of exposed portion 82" is preferably 2.5 times or less of the above "diameter of the portion of buried portion 83 extending from pressing portion 82".

[0155] In addition, in order to maintain stable adhesion between the solar power generation device 5 and the exposed portions 82, it is preferable that the ratio (S2 / S1 x 100%) of the area S2 of the cross-section at the upper end of each exposed portion 82 (i.e., the upper surface of each exposed portion 82) to the area S1 of the surface 85 of the solar power generation device 5 be 0.1% or more, more preferably 1% or more, and even more preferably 5% or more, and the ratio (ΣS2 / S1 x 100%) of the "total ΣS2 of the cross-sectional areas S2 at the upper ends of all exposed portions 82 provided on the fixing structure 2" to the area S1 of the surface 85 of the solar power generation device 5 be 5% or more, more preferably 10%, and even more preferably 20%.

[0156] In order to stably maintain adhesion between the solar power generation device 5 and the exposed portions 82, the ratio (S2 / S4×100%) of the area S2 of the cross section at the upper end of each exposed portion 82 (i.e., the upper surface of each exposed portion 82) to the area S4 (S4=S1-ΣS3) obtained by subtracting the sum ΣS3 of the areas S3 of the power generation sections 10 of the solar power generation device 5 from the area S1 of the surface 85 of the solar power generation device 5 is preferably 10% or more, more preferably 50% or more, and even more preferably 80% or more. Note that it is not necessary to adjust the ratio (S2 / S1×100%) and the ratio (ΣS2 / S1×100%) to the above values ​​and adjust the ratio (S2 / S4×100%) to the above value at the same time, and it is also possible to adjust only one of them.

[0157] (Action and effect) According to this embodiment, the exposed portion 82 of the fixture 81 is adhered to the surface 85 opposite the light-receiving surface 84 of the solar power generation device 5, and therefore the fixture 81 does not block the light directed toward the light-receiving surface 84 of the solar power generation device 5. Therefore, it is possible to prevent the fixture 81 from reducing the amount of power generated by the solar power generation device 5.

[0158] Furthermore, the solar power generation system of the present invention can be modified as shown in Figures 22 and 23. A solar power generation system 900 shown in Figures 22 and 23 includes an installation surface 3, an elastic body 93, and a solar power generation device 5, with the elastic body 93 placed and fixed on the installation surface 3, and a back sheet constituting the bottom of the solar power generation device 5 placed and fixed on the upper surface of the elastic body 93.

[0159] Elastic body 22 and 23, the fixing material 93 is disposed in a portion avoiding the power generation unit 10, and detachably fixes the solar power generation device 5 to the installation surface 3. In this embodiment, the fixing material 93 extends along one direction of the solar power generation device 5 between the solar power generation device 5 and the installation surface 3, and is disposed at an interval in another direction perpendicular to the one direction.

[0160] In the illustrated example, the fixing members 93 extend along the short side direction of the solar power generation device 5, which has a rectangular shape in a plan view, between the solar power generation device 5 and the installation surface 3, and are arranged at intervals in the longitudinal direction. The fixing members 93 fix a portion of the solar power generation device 5 to the installation surface 3. The solar power generation device 5 is not fixed to the installation surface 3 over its entire area by the fixing members 93, and its peripheral portion is not fixed to the installation surface 3 along its entire circumference. Therefore, the solar power generation device 5 includes a non-fixed portion 94 inside the peripheral portion that is not fixed to the installation surface 3, and also includes a non-fixed portion 95 on the peripheral portion that is not fixed to the installation surface 3.

[0161] The peripheral portion means an area having a certain range from the peripheral edge (four sides 96-99 in this embodiment) that defines the outline of the solar power generation device 5. The non-fixed portion means a portion of the solar power generation device 5 that is not restricted by any member from moving in a direction away from the installation surface 3. In the non-fixed portions 95, 94, a gap may occur between the solar power generation device 5 and the installation surface 3, but this gap is about 1 mm or more and 5 mm or less.

[0162] The transverse elastic modulus (transverse elastic modulus) of the elastic body 93 is preferably 0.05 MPa or more, more preferably 0.1 MPa or more, more preferably 0.5 MPa or more, more preferably 1 MPa or more, more preferably 5 MPa or more, and more preferably 10 MPa or more. The transverse elastic modulus (transverse elastic modulus) of the elastic body 93 is preferably 1000 MPa or less, more preferably 500 MPa or less, more preferably 400 MPa or less, more preferably 300 MPa or less, more preferably 200 MPa or less, more preferably 100 MPa or less, and more preferably 50 MPa or less. The viscosity of the elastic body 93 is preferably 0.1 Pa·s or more, more preferably 0.5 Pa·s or more, more preferably 1 Pa·s or more, more preferably 10 Pa·s or more, more preferably 100 Pa·s or more, and more preferably 500 Pa·s or more. The viscosity of the elastic body 93 is preferably 10000 Pa·s or less, more preferably 5000 Pa·s or less, more preferably 4000 Pa·s or less, more preferably 3000 Pa·s or less, more preferably 2000 Pa·s or less, more preferably 1000 Pa·s or less, more preferably 800 Pa·s or less. Examples of the elastic body 93 include hook-and-loop fasteners such as Magic Tape (registered trademark), magnets, double-sided tape, and adhesives. The elastic body 93 can be used by selecting one or a combination of multiple types from these. When the elastic body 93 is made of a composite material such as a magnet or double-sided tape, the above-mentioned transverse elastic modulus (transverse elastic modulus) is measured by conducting a test in which the entire elastic body 93 is pulled in a direction along the installation surface 3. When the elastic body has a composite material, the above-mentioned viscosity is measured by a method of measuring the viscosity between layers, such as shear measurement.

[0163] The solar power generation system 900 is also characterized in that the power generation units 10 are arranged at intervals in the longitudinal direction, which is the other direction, of the solar power generation device 5, and the elastic bodies 93 are arranged at intervals in the longitudinal direction, which is the other direction, of the solar power generation device 5, so as to sandwich each power generation unit 10. This makes it possible to suppress the solar power generation device 5 from vibrating due to the influence of wind, etc., when the solar power generation device 5 is installed on the installation surface 3. It is possible to suppress a decrease in the power generation efficiency of the installed solar power generation device 5 due to vibration.

[0164] In addition, the elastic body 93 is not limited to the above-mentioned hook-and-loop fastener, magnet, double-sided tape, and adhesive, so long as it can easily fix the solar power generation device 5 to the installation surface 3 and can easily peel the solar power generation device 5 from the installation surface 3 when retrieving the solar power generation device 5.

[0165] In the illustrated example, a pair of band-shaped hook-and-loop fasteners 93A, 93B that are mutually detachable and have a predetermined width and length are used as elastic body 93. The transverse elastic modulus (transverse elastic modulus) of each of hook-and-loop fasteners 93A, 93B is preferably 0.05 MPa or more, more preferably 0.1 MPa or more, more preferably 0.5 MPa or more, more preferably 1 MPa or more, more preferably 5 MPa or more, and more preferably 10 MPa or more. Also, the transverse elastic modulus (transverse elastic modulus) of each of hook-and-loop fasteners 93A, 93B is preferably 1000 MPa or less, more preferably 500 MPa or less, more preferably 400 MPa or less, more preferably 300 MPa or less, more preferably 200 MPa or less, more preferably 100 MPa or less, and more preferably 50 MPa or less. The viscosity of each of the hook-and-loop fasteners 93A, 93B is preferably 0.1 Pa·s or more, more preferably 0.5 Pa·s or more, more preferably 1 Pa·s or more, more preferably 10 Pa·s or more, more preferably 100 Pa·s or more, and more preferably 500 Pa·s or more. The viscosity of each of the hook-and-loop fasteners 93A, 93B is preferably 10,000 Pa·s or less, more preferably 5,000 Pa·s or less, more preferably 4,000 Pa·s or less, more preferably 3,000 Pa·s or less, more preferably 2,000 Pa·s or less, more preferably 1,000 Pa·s or less, and more preferably 800 Pa·s or less. One hook-and-loop fastener 93A is fixed to the surface of the photovoltaic power generation device 5 facing the installation surface 3 using, for example, an adhesive, a pressure-sensitive adhesive, double-sided tape, or the like, and the other hook-and-loop fastener 93A is fixed to the installation surface 3 using, for example, an adhesive, a pressure-sensitive adhesive, double-sided tape, or the like.

[0166] The material of the hook and loop fasteners 93A and 93B is not particularly limited, but may be, for example, nylon, polyester, polypropylene, etc. Among them, polypropylene is preferable from the viewpoint of durability. A specific example of the hook and loop fasteners 93A and 93B may be, for example, TMSD-25 manufactured by TRSUCO.

[0167] Although there is no particular limitation on the hook and loop fastener 93A, it is preferably provided so as to extend along a pair of opposing sides of the solar power generation device 5. In this embodiment, the hook and loop fastener 93A is provided so as to extend along a pair of short sides 96, 97 of the solar power generation device 5. The hook and loop fastener 93A may abut against the pair of short sides 96, 97 of the solar power generation device 5, in other words, there may be no gap between the pair of short sides 96, 97, or the hook and loop fastener 93A may be close to the pair of short sides 96, 97 of the solar power generation device 5, in other words, there may be a gap between the pair of short sides 96, 97.

[0168] Furthermore, one hook-and-loop fastener 93A or multiple hook-and-loop fasteners 93A spaced apart from one another are provided between a pair of short sides 96, 97 of the solar power generation device 5 so as to extend parallel to the pair of short sides 96, 97. These hook-and-loop fasteners 93A are not particularly limited, but from the viewpoint of firmly fixing the solar power generation device 5 to the installation surface 3, it is preferable that they extend continuously and uninterrupted over the entire length or almost the entire length between the other pair of opposing sides of the solar power generation device 5 (between the pair of long sides 98, 99 in the illustrated example).

[0169] In addition, "parallel" means "substantially parallel," and includes not only cases where the target straight lines or surfaces do not intersect even when extended, but also cases where the target lines or surfaces intersect within a range of 10° when extended.

[0170] At least one hook and loop fastener 93A provided between a pair of short sides 96, 97 of the solar power generation device 5 is provided in a portion that avoids the power generation unit 10 (a portion that does not overlap the power generation unit 10 in a plan view), but is not particularly limited thereto. For example, the hook and loop fastener 93A is provided in a portion 101 between adjacent power generation units 10 (hereinafter referred to as a "cell boundary portion 101"). In this case, from the viewpoint of firmly fixing the solar power generation device 5 to the installation surface 3, it is preferable that the hook and loop fasteners 93A are provided at all of the cell boundary portions 101. In other words, it is preferable that the hook and loop fasteners 93A are provided at intervals in the longitudinal direction of the solar power generation device 5 so as to sandwich each power generation unit 10 from both sides. Note that the hook and loop fasteners 93A do not necessarily need to be provided at all of the cell boundary portions 101.

[0171] Due to the arrangement of hook-and-loop fasteners 93A described above, the portion of solar power generation device 5 where power generation unit 10 is located inside the periphery (the portion overlapping power generation unit 10 in a plan view) is not provided with hook-and-loop fasteners 93A, and this portion becomes non-fixed portion 94 that is not fixed to the installation surface 3. Further, the portion of solar power generation device 5 that is along a pair of long sides 98, 99 of the periphery and adjacent to power generation unit 10 is not provided with hook-and-loop fasteners 93A, and this portion becomes non-fixed portion 95 that is not fixed to the installation surface 3.

[0172] The width of the hook-and-loop fastener 93A as the elastic body 93 is not particularly limited, but is preferably 10 mm or more and 50 mm or less, and more preferably 15 mm or more and 30 mm or less. When the width of the hook-and-loop fastener 93A is within the above-mentioned numerical range, the solar power generation device 5 can be satisfactorily fixed to the installation surface 3, and the solar power generation device 5 can be easily peeled off from the installation surface 3 when retrieving the solar power generation device 5. Furthermore, it is possible to prevent the hook-and-loop fastener 93A from protruding beyond the portion where the power generation unit 10 of the solar power generation device 5 is located, and thus prevent the portion where the power generation unit 10 of the solar power generation device 5 is located from being fixed to the installation surface 3.

[0173] How to install a solar power generation system Next, an example of a construction method for installing the solar power generation device 5 according to this embodiment on the installation surface 3 will be described.

[0174] First, the worker fixes hook-and-loop fastener 93A and detachable hook-and-loop fastener 93B provided on the solar power generation device 5 as elastic body 93 to the location on the installation surface 3 where the solar power generation device 5 will be placed, at a position corresponding to hook-and-loop fastener 93A, using adhesive, pressure-sensitive adhesive, double-sided tape, etc.

[0175] Then, the worker places the photovoltaic power generation device 5 on the installation surface 3, and sequentially attaches the hook-and-loop fasteners 93A provided at intervals in the longitudinal direction of the photovoltaic power generation device 5, starting from the hook-and-loop fastener 93A at one end in the longitudinal direction (one of the short sides of a pair of short sides 96, 97) to the corresponding hook-and-loop fastener 93B on the installation surface 3. As a result, the photovoltaic power generation device 5, which is rectangular in plan view, is fixed to the installation surface 3 at a plurality of parts that avoid the power generation unit 10 of the photovoltaic power generation device 5 and are spaced apart from each other in the longitudinal direction (the other of the vertical and horizontal directions) by the elastic body 93 extending along the short side direction (one of the vertical and horizontal directions) of the photovoltaic power generation device 5. This completes the installation of the photovoltaic power generation device 5. With this method, the flexible photovoltaic power generation device 5 can be easily installed on the installation surface 3.

[0176] How to remove a solar power generation device Next, an example of a method for peeling off the solar power generation device 5 according to this embodiment from the installation surface 3 will be described.

[0177] When recovering the solar power generation device 5, as shown in Figures 22 and 25, the solar power generation device 5 is peeled off from the installation surface 3 not in the short direction in which the elastic body 93 extends, but in the longitudinal direction (the direction shown by the arrow in Figure 22) that intersects with the short direction in which the elastic body 93 extends.

[0178] Specifically, for the elastic bodies 93 arranged at intervals in the longitudinal direction of the photovoltaic power generation device 5, first, as shown in Fig. 25(A), the elastic body 93 located at one end in the longitudinal direction (one short side 96 of a pair of short sides 96, 97) is released from fixing the photovoltaic power generation device 5 to the installation surface 3, that is, the hook-and-loop fastener 93A on the photovoltaic power generation device 5 side is removed from the hook-and-loop fastener 93B on the installation surface 3 side. This makes it possible to easily peel off the non-fixed portions 15, 16 of the photovoltaic power generation device 5 adjacent to the released elastic body 93 from the installation surface 3. The portion of the photovoltaic power generation device 5 peeled off from the installation surface 3 is folded over to the opposite side at the cell boundary portion 14 where the next elastic body 93 in the longitudinal direction is located.

[0179] 25(B), the fixation of the photovoltaic power generation device 5 to the installation surface 3 by the next elastic body 93 in the longitudinal direction is released, that is, the hook-and-loop fastener 93A on the photovoltaic power generation device 5 side is removed from the hook-and-loop fastener 93B on the installation surface 3 side. This makes it possible to easily peel off the unfixed portions 15, 16 of the photovoltaic power generation device 5 adjacent to the released elastic body 93 from the installation surface 3. The portion of the photovoltaic power generation device 5 that has been peeled off from the installation surface 3 is folded over to the opposite side at the cell boundary portion 14 where the next elastic body 93 in the longitudinal direction is located.

[0180] 25(C), the elastic body 93 located at the other end in the longitudinal direction (the other short side 97 side of the pair of short sides 96, 97) is released from fastening the photovoltaic power generation device 5 to the installation surface 3, that is, the hook-and-loop fastener 93A on the photovoltaic power generation device 5 side is removed from the hook-and-loop fastener 93B on the installation surface 3 side. This makes it possible to peel the entire photovoltaic power generation device 5 off from the installation surface 3 and recover the photovoltaic power generation device 5.

[0181] According to this method, when the solar power generation device 5 is peeled off from the installation surface 3, the power generation unit 10 does not bend and stress is not concentrated on the power generation unit 10, so that the solar power generation device 5 can be easily peeled off from the installation surface 3 while suppressing damage to the power generation unit 10. Also, because the solar power generation device 5 can be peeled off from the installation surface 3 while being folded compactly, even in a windy environment such as on a roof, the solar power generation device 5 can be prevented from being blown by the wind, and the solar power generation device 5 can be easily peeled off from the installation surface 3.

[0182] Alternatively, as shown in FIG. 25(B), in addition to the portion of the peripheral portion of the solar power generation device 5 that is not fixed to the installation surface 3 by the elastic body 93 (non-fixed portion 95 in the above-described embodiment), the portion inside the peripheral portion of the solar power generation device 5 where the power generation unit 10 is located (non-fixed portion 94 in the above-described embodiment) may be fixed to the installation surface 3 by a weak elastic body 102.

[0183] The weak elastic body 102 may be at least one selected from the group consisting of a hook-and-loop fastener, a magnet, a double-sided tape, and an adhesive. The fixing force of the weak elastic body 102 is preferably 3 / 4 or less, more preferably 2 / 3 or less, and more preferably 1 / 2 or less of the fixing force of the elastic body 93.

[0184] In this specification, the fixing force by the elastic body 93 and the weak elastic body 102 mainly refers to the peeling force, which is preferably measured by a 90 degree peel test (JIS Z0237). The measurement method and peeling speed should be measured under the same conditions when making the above relative comparison.

[0185] The means for varying the strength of the fixing force by the elastic body 93 and the fixing force by the weak fixing material 102 is not particularly limited, but if the elastic body 93 and the weak fixing material 102 are hook-and-loop fasteners, examples of the means include making a difference in their mutual adhesive strength, or making a difference in the width of the hook-and-loop fasteners. If the elastic body 93 and the weak fixing material 102 are magnets, examples of the means include making a difference in magnetic force, or making a difference in the width of the magnets. If the elastic body 93 and the weak fixing material 102 are double-sided tape or adhesive, examples of the means include making a difference in adhesive strength, or making a difference in the width of the double-sided tape or adhesive application area.

[0186] 25, when the fixing force of the weak fixing material 102 is, for example, ½ or less of the fixing force of the elastic body 93, the photovoltaic power generation device 5 can be peeled off from the installation surface 3 as described below. That is, when the photovoltaic power generation device 5 is gradually peeled off from the installation surface 3, the fixing of the photovoltaic power generation device 5 and the installation surface 3 by the weak fixing material 102 is easily released as the photovoltaic power generation device 5 is peeled off, that is, when the photovoltaic power generation device 5 can be easily peeled off from the installation surface 3 without bending the power generation unit 10, the photovoltaic power generation device 5 is peeled off from the installation surface 3 as in the above-described embodiment.

[0187] 25, when the fixing force of the weak fixing material 102 is, for example, ½ or less of the fixing force of the elastic body 93, the photovoltaic power generation device 5 can be peeled off from the installation surface 3 as described below. In other words, when the photovoltaic power generation device 5 is gradually peeled off from the installation surface 3, if the fixing of the photovoltaic power generation device 5 and the installation surface 3 by the weak fixing material 102 does not come off easily while the photovoltaic power generation device 5 is peeled off and the power generation unit 10 is bent, the part of the photovoltaic power generation device 5 that is fixed to the installation surface 3 by the weak fixing material 102 is first peeled off from the installation surface 3. Then, similar to the above-mentioned embodiment, the photovoltaic power generation device 5 is peeled off from the installation surface 3.

[0188] This allows the solar power generation device 5 to be securely fixed to the installation surface 3 and prevents it from peeling off from the installation surface 3 when installed, and allows the solar power generation device 5 to be easily peeled off from the installation surface 3 when it is time to retrieve the solar power generation device 5.

[0189] In all the above-described embodiments, the solar power generation device 5 has a plurality of power generation units 10 arranged in a row in the longitudinal direction. As another embodiment of a solar power generation system 900, as shown in Fig. 8, the solar power generation device 5 may have a plurality of rows in the lateral direction, each row having a plurality of power generation units 10 arranged in the longitudinal direction.

[0190] The present disclosure encompasses the following.

[0191] One example of a conventional solar power generation device is a flexible solar cell module that includes a metal plate, a fluororesin sheet, a photoelectric conversion layer disposed between the metal plate and the fluororesin sheet, and an adhesive layer filled between the metal plate and the fluororesin sheet. The flexible solar cell module has flexibility.

[0192] Incidentally, since the flexible solar cell module as described above has flexibility, it may be partially bent depending on the location where it is installed.

[0193] However, when a part of a flexible solar cell module is bent, there is a concern that peeling may occur at at least one of the interface between the adhesive layer and the metal plate and the interface between the adhesive layer and the fluororesin sheet.

[0194] That is, when a part of a flexible solar cell module is bent, the fluororesin sheet and the metal plate are deformed at the bent portion, causing one to elongate and the other to shrink. At this time, since the adhesive layer is fixed to the fluororesin sheet and the metal plate, it not only follows the bending of both, but also elastically deforms following the elongation and shrinkage, while residual stress may occur in the adhesive layer. For this reason, in conventional flexible solar cell modules, there is a concern that peeling may occur at the interface between adjacent layers (hereinafter sometimes referred to as the "interface between layers") after long-term use in a manner other than in a flat state.

[0195] Another object of the present invention is to provide a photovoltaic power generation device that can suppress peeling at the interface between layers due to long-term use even in a use mode other than the flat mode.

[0196] In order to achieve the above object, the present invention encompasses a solar power generation device as described in the following item 1.

[0197] Item 1. Back sheet, a light-transmitting barrier sheet provided at a distance from the back sheet; a power generating section disposed between the back sheet and the barrier sheet; a sealant filled between the back sheet and the barrier sheet and covering at least a portion of the power generating section, A solar power generation device, wherein the sealant has a transverse elastic modulus of 400 MPa or less.

[0198] The solar power generation device according to item 1 preferably includes an embodiment according to item 2 below.

[0199] Item 2. Back sheet and a light-transmitting barrier sheet provided at a distance from the back sheet; a power generating section disposed between the back sheet and the barrier sheet; a sealant filled between the back sheet and the barrier sheet and covering at least a portion of the power generating section; Equipped with The viscosity of the sealant is 11000 mPa·S or more and 700000 mPa·S or less. Solar power generation equipment.

[0200] The solar power generation device according to item 1 or 2 preferably includes the embodiment according to item 3 below.

[0201] Item 3. The solar power generation device according to item 1 or 2, wherein the peel strength of the back sheet relative to the sealant is 0.1 N / mm or more.

[0202] The solar power generation device according to any one of items 1 to 3 preferably includes an embodiment according to item 4 below.

[0203] Item 4. The photovoltaic power generating device according to any one of Items 1 to 3, wherein a peel strength of the barrier sheet relative to the sealant is 0.1 N / mm or more.

[0204] The solar power generation device according to any one of items 1 to 4 preferably includes an embodiment according to item 5 below.

[0205] Item 5. Further comprising at least one bent portion, 5. The photovoltaic power generation device according to any one of items 1 to 4, wherein an angle of the bent portion is equal to or greater than 150° and less than 180°.

[0206] The solar power generation device according to any one of items 1 to 5 preferably includes an embodiment according to item 6 below.

[0207] Item 6. The photovoltaic power generating device according to any one of items 1 to 5, wherein a ratio of a linear expansion coefficient of the barrier sheet to that of the back sheet is 6.0 or less.

[0208] The solar power generation device according to any one of items 1 to 6 preferably includes an embodiment according to item 7 below.

[0209] Item 7. The solar power generation device according to any one of items 1 to 6, wherein the back sheet includes a metal plate.

[0210] The solar power generation device according to any one of items 1 to 7 preferably includes an embodiment according to item 8 below.

[0211] Item 8. The photovoltaic power generation device according to any one of items 1 to 7, wherein the back sheet includes a building board.

[0212] The photovoltaic power generation device of the above aspect has the advantage that peeling at the interface between layers due to long-term use can be suppressed even in usage aspects other than the flat aspect.

[0213] Conventionally, in order to fix a solar power generation device, a frame surrounding the solar power generation device is fastened to a support material using metal fittings.

[0214] If the frame is exposed on the light-receiving surface side of the photovoltaic power generation device, the frame may block light directed toward the light-receiving surface, which may result in a problem of reduced power generation by the photovoltaic power generation device.

[0215] Another object of the present invention is to provide a fixing structure for a solar power generation device that can prevent a reduction in the amount of power generated by the solar power generation device due to the fixing device, since the fixing device does not block light directed toward the light receiving surface of the solar power generation device.

[0216] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0217] Item 1. A solar power generation device that generates electricity when light is incident on a light receiving surface, one or more fasteners for fastening the solar power generation device to a fastening object; The fixing device includes an exposed portion exposed from the object to be fixed, and at least one embedded portion formed integrally with the exposed portion and embedded in the object to be fixed, A fixing structure for a solar power generation device, in which the exposed portion and a surface of the solar power generation device opposite the light receiving surface are bonded via an adhesive layer.

[0218] The fixing structure for a photovoltaic power generation device according to item 1 preferably includes the following embodiment according to item 2.

[0219] Item 2. The power generating sheet has flexibility, Item 2. The fixing structure for a solar power generating device according to item 1, wherein the power generating sheet has a bending strength of 10 MPa or more and 150 MPa or less.

[0220] The fixing structure for a photovoltaic power generation device according to item 1 or 2 preferably includes an embodiment according to item 3 below.

[0221] Item 3. The fixing structure for a solar power generation device according to item 1 or 2, wherein the fixing member is made of resin.

[0222] The fixing structure for a photovoltaic power generation device according to any one of items 1 to 3 preferably includes the embodiment described in item 4 below.

[0223] Item 4. The fixing structure for a solar power generation device according to any one of Items 1 to 3, wherein the adhesive layer is formed from a resin composition containing at least one selected from the group consisting of vinyl acetate resin, ethylene vinyl acetate resin, epoxy resin, cyanoacrylate resin, acrylic resin, chloroprene rubber, styrene, butadiene rubber, polyurethane resin, silicone resin, and modified silicone resin.

[0224] According to the above-mentioned aspect, since the exposed portion and the surface of the solar power generation device opposite to the light receiving surface are bonded, the fixture does not block the light directed toward the light receiving surface of the solar power generation device, and therefore it is possible to prevent the fixture from reducing the amount of power generated by the solar power generation device. [Explanation of symbols]

[0225] 1,201,302 Laminate 3. Fiber-containing sheets 4,93,301 Elastic body 5. Solar power generation equipment 6 Back Seat 100,200,300,400,500,600,700,800,900 Solar power generation system

Claims

1. The installation surface, An elastic body; A back sheet that constitutes a bottom portion of the solar power generation device, The elastic body is fixed in a state in which it is placed on the installation surface, The back sheet is a laminate that is placed on and fixed to the upper surface of the elastic body.

2. 2. The laminate according to claim 1, wherein the elastic body has a longitudinal elastic modulus of 0.1 MPa or more and 1000 MPa or less.

3. 2. The laminate according to claim 1, wherein a ratio (Eb / Ea) of a transverse elastic modulus Ea of the back sheet to a transverse elastic modulus Eb of the elastic body is 0.002 or more and 0.1 or less.

4. The laminate according to claim 1 , wherein the elastic body has a transverse elastic modulus of 0.05 MPa or more and 1000 MPa or less.

5. The installation surface is made of a fiber-containing sheet, 2. The laminate according to claim 1, wherein the shear peel strength between the fiber-containing sheet and the back sheet via the elastic body is 0.1 N / cm or more.

6. The installation surface is made of a fiber-containing sheet, The laminate according to claim 1 , wherein the elastic body has a linear expansion coefficient that is greater than a linear expansion coefficient of the fiber-containing sheet and less than a linear expansion coefficient of the back sheet.

7. The solar power generation device includes the back sheet, a power generation unit, a barrier sheet, and a sealant, the barrier sheet is disposed on the opposite side to the back sheet in a thickness direction of the solar power generating device, the power generating section includes a power generating cell which is a photoelectric conversion element utilizing a photovoltaic effect, and is disposed between the back sheet and the barrier sheet; the sealant is filled in a space around the power generating section between the barrier sheet and the back sheet, The laminate according to claim 1 , wherein the sealant has a transverse elastic modulus of 0.01 MPa or more and 500 MPa or less.

8. The installation surface, An elastic body; A solar power generation device is provided. A solar power generation system in which the elastic body is placed and fixed on the installation surface, and a back sheet constituting the bottom of the solar power generation device is placed and fixed on the upper surface of the elastic body.

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