Solar power generation equipment

Abstract

To provide a photovoltaic power generation device having high durability even when fixed by drilling holes in the photovoltaic power generation device. [Solution] A solar power generation device having a power generation unit, a sealing layer that seals the entire power generation unit, a front sheet laminated on the light-receiving surface of the sealing layer, a back sheet laminated on the surface of the sealing layer opposite the light-receiving surface, through holes that are arranged along at least one side of the front sheet and penetrate the front sheet at multiple points, and a fixing member that passes through the through holes, wherein the power generation unit and the sealing layer are laminated inside the peripheral edge of the front sheet, the front sheet covers the entire light-receiving surface and side surface of the sealing layer, and the through holes do not come into contact with the sealing layer.

Description

[Technical Field]

[0001] The present invention relates to a solar power generation device. [Background technology]

[0002] Rigid solar cell panels made of silicon semiconductors have traditionally been widely used as solar cells. However, due to their relatively heavy weight, conventional solar cell panels cannot be installed on some structures with low load-bearing capacity. Furthermore, even on suitable installation surfaces, they cannot be installed in areas with low load-bearing capacity, resulting in ineffective utilization of the installation surface area. Therefore, in recent years, flexible solar cells using heat-resistant polymer materials such as polyimide and polyester, or metal foil as a base material, have been attracting attention. Flexible solar cells offer advantages such as thinness and light weight, making them easy to transport and install, and being shock-resistant. They can also be installed on folded-plate roofs, which previously were difficult to install due to their low load-bearing capacity. While a method for installing photovoltaic sheets using flexible solar cells has not yet been established, Patent Document 1 discloses a solar cell sheet that is sewn with threads to secure the sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-181566 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when a flexible solar cell is fixed using a thread-like material as in Patent Document 1 or by punching holes with a tacker, stapler, or the like, there is a problem that the durability of the flexible solar cell is reduced.

[0005] An object of the present invention is to provide a photovoltaic power generation device that is highly durable even when fixed by drilling holes in the photovoltaic power generation device. [Means for solving the problem]

[0006] The present invention includes the following Disclosures 1 to 8. The present invention will be described in detail below. [Disclosure 1] A power generation unit; a sealing layer that seals the entire power generation section; a front sheet laminated on the light-receiving surface side of the sealing layer; a back sheet laminated on a surface of the sealing layer opposite to the light-receiving surface; through holes provided along at least one side of the front sheet and penetrating the front sheet at a plurality of locations; A solar power generation device having a fixing member passing through the through hole, the power generation unit and the sealing layer are laminated inside the peripheral edge portion of the front sheet, the front sheet covers the entire light-receiving surface and side surfaces of the sealing layer, The solar power generation device, wherein the through-hole is not in contact with the sealing layer. [Disclosure 2] The solar power generation device according to Disclosure 1, further comprising a frame member disposed on the front sheet so as to surround the portion of the front sheet that contacts the side surface of the sealing layer. [Disclosure 3] 3. The photovoltaic power generation device according to claim 1 or 2, wherein the minimum distance between the sealing layer and the through hole is 1 mm or more. [Disclosure 4] The solar power generation device according to Disclosure 1 or 2, wherein the minimum distance between the power generation section and the through hole is 5 mm or more. [Disclosure 5] a sheet-like member on the side opposite to the light receiving surface of the front sheet and the back sheet; The photovoltaic power generation device according to any one of Disclosures 1 to 4, wherein the through-hole penetrates the front sheet and the sheet-like member. [Disclosure 6] the power generation unit and the sealing layer are laminated inside the peripheral edge of the back sheet, a surface of the back sheet on the light-receiving side and a surface of the front sheet on the opposite side to the light-receiving side are in contact with each other; The photovoltaic power generation device according to any one of Disclosures 1 to 5, wherein the through-hole passes through the front sheet and the back sheet. [Disclosure 7] The photovoltaic power generation device according to any one of Disclosures 1 to 6, wherein the fixing member is a thread-like member. [Disclosure 8] The solar power generation device according to Disclosure 7, wherein the diameter of the filamentous member after immersion in water is 1.05 times or more when the diameter of the filamentous member in a dry state is 1. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a photovoltaic power generation device that is highly durable even when fixed by drilling holes in the photovoltaic power generation device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view schematically illustrating an example of a solar power generation device of the present invention. [Figure 2] 1 is a top view schematically illustrating an example of a solar power generation device according to the present invention. [Figure 3] FIG. 10 is a cross-sectional view schematically illustrating another example of the solar power generation device of the present invention. [Figure 4] FIG. 10 is a cross-sectional view schematically illustrating another example of the solar power generation device of the present invention. [Figure 5] FIG. 10 is a cross-sectional view schematically illustrating another example of the solar power generation device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in more detail below by giving specific embodiments, but the present invention is not limited to these embodiments.

[0010] (Embodiment 1) FIG. 1 is a cross-sectional view showing a schematic example of a solar power generation device of the present invention, and FIG. 2 is a top view showing a schematic example of a solar power generation device of the present invention. The solar power generation device 1 of the first embodiment includes a power generation unit 11, a sealing layer 12 that seals the entire power generation unit 11, a front sheet 13 laminated on the light-receiving surface of the sealing layer 12, and a back sheet 14 laminated on the surface of the sealing layer 12 opposite the light-receiving surface. The sealing layer 12, the power generation unit 11, and the back sheet 14 are laminated inside the peripheral edge of the front sheet 13; that is, the peripheral edge of the front sheet 13 is located outside the peripheral edges of the sealing layer 12, the power generation unit 11, and the back sheet 14. The front sheet 13 covers the entire light-receiving surface and side surface of the sealing layer 12 and the side surface of the back sheet 14, and has through holes 3 at multiple locations along at least one edge. The through holes 3 also penetrate the sheet-like member 2 arranged on the side opposite the light-receiving surface of the front sheet 13 and the back sheet 14, and a fixing member 4 passes through the through holes 3 to fix the solar power generation device 1 to the sheet-like member 2. Furthermore, the through-holes 3 are arranged so as not to come into contact with the sealing layer 12 . The light-receiving surface here refers to the surface on which light is incident when the solar power generation device is installed.

[0011] The inventors investigated the cause of the reduced durability of conventional flexible solar cells when they are sewn and fixed, and discovered that this is due to through-holes formed during fixation passing through the sealing layer. In flexible solar cells, the sealing layer places importance on adhesion to layers in contact with the sealing layer, and water vapor barrier performance must often be compromised to some extent. When through-holes are formed through a sealing layer with poor water vapor barrier performance, moisture penetrates through the sealing layer in contact with the through-hole and reaches the power generation section, causing deterioration of the power generation section. In the present invention, the through-holes do not come into contact with the sealing layer, i.e., no sealing layer is provided at the fixing portion of the solar power generation device, thereby suppressing moisture penetration through the through-holes and improving durability. Furthermore, by covering the entire light-receiving surface and side surfaces of the sealing layer with a front sheet, the sealing layer is not exposed to the outside, further improving durability.

[0012] The power generating section is a section that converts sunlight into electricity, and is composed of a substrate, an electrode, a counter electrode, a photoelectric conversion layer, an electron transport layer, a hole transport layer, etc., and has at least an electrode, a photoelectric conversion layer, and a counter electrode. In this specification, the term "layer" refers not only to a layer having a clear boundary but also to a layer having a concentration gradient in which the contained elements gradually change. Elemental analysis of a layer can be performed, for example, by performing FE-TEM / EDS line analysis measurement of a cross section of a solar cell to confirm the element distribution of a specific element. Furthermore, in this specification, the term "layer" refers not only to a flat thin-film layer but also to a layer that can form a complex, intricate structure together with other layers.

[0013] Examples of the substrate include resin films made of heat-resistant polymers such as polyimide and polyester, metal foils, thin glass sheets, etc. Among these, PET resin films are preferred from the viewpoints of cost and heat resistance.

[0014] The materials for the electrodes and counter electrodes are not particularly limited, and examples thereof include FTO (fluorine-doped tin oxide), ITO (tin-doped indium oxide), AZO (aluminum zinc oxide), IZO (indium zinc oxide), GZO (gallium zinc oxide), sodium, sodium-potassium alloy, lithium, magnesium, aluminum, magnesium-silver mixture, magnesium-indium mixture, aluminum-lithium alloy, Al / Al2O3 mixture, and Al / LiF mixture. Other examples include gold, silver, titanium, molybdenum, tantalum, tungsten, carbon, nickel, and chromium. These materials may be used alone or in combination.

[0015] The thickness of the electrode and the counter electrode is not particularly limited, but a preferred lower limit is 10 nm and a preferred upper limit is 1000 nm. If the thickness is 10 nm or more, the resistance can be reduced while the electrode functions. If the thickness is 1000 nm or less, the light transmittance can be further improved. A more preferred lower limit of the thickness of the electrode and the counter electrode is 50 nm and a more preferred upper limit is 500 nm.

[0016] The photoelectric conversion layer preferably contains an organic-inorganic perovskite compound. The organic-inorganic perovskite compound is a compound represented by the general formula AMX (where A is an organic base compound and / or an alkali metal, M is a lead or tin atom, and X is a halogen atom), and a solar cell containing such an organic-inorganic perovskite compound is also called an organic-inorganic hybrid solar cell. By using the organic-inorganic perovskite compound in the photoelectric conversion layer of the power generation section, the photoelectric conversion efficiency of the solar power generation device can be further improved.

[0017] The above A is an organic base compound and / or an alkali metal. Specific examples of the organic base compound include methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine, dipentylamine, dihexylamine, trimethylamine, triethylamine, tripropylamine, tributylamine, tripentylamine, trihexylamine, ethylmethylamine, methylpropylamine, butylmethylamine, methylpentylamine, hexylmethylamine, ethylpropylamine, ethylbutylamine, formamidine, acetamidine, guanidine, imidazole, azole, pyrrole, aziridine, azirine, azetidine, azeto, azole, imidazoline, carbazole, and ions thereof (e.g., methylammonium (CHNH)), phenethylammonium, and the like. Of these, methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, formamidine, acetamidine, ions thereof, and phenethylammonium are preferred, and methylamine, ethylamine, propylamine, formamidine, and ions thereof are more preferred. Examples of the alkali metal include lithium, sodium, potassium, rubidium, and cesium.

[0018] The metal atom M is a lead or tin atom. These metal atoms may be used alone or in combination of two or more.

[0019] The X is a halogen atom, and examples of the halogen atom include chlorine, bromine, iodine, sulfur, and selenium. These halogen atoms may be used alone or in combination of two or more. By including a halogen in the structure, the organic-inorganic perovskite compound becomes soluble in organic solvents, enabling application to inexpensive printing methods and the like. In particular, X is preferably iodine, since this narrows the energy band gap of the organic-inorganic perovskite compound.

[0020] The organic-inorganic perovskite compound preferably has a cubic structure in which a metal atom M is located at the body center, an organic base compound or alkali metal A is located at each vertex, and a halogen atom X is located at the face center. Although the details are not clear, it is presumed that the above structure allows the orientation of the octahedra within the crystal lattice to be easily changed, thereby increasing the mobility of electrons in the organic-inorganic perovskite compound and improving the photoelectric conversion efficiency of solar cells.

[0021] The organic-inorganic perovskite compound is preferably a crystalline semiconductor. By crystalline semiconductor, we mean a semiconductor from which a scattering peak can be detected by measuring an X-ray scattering intensity distribution. When the organic-inorganic perovskite compound is a crystalline semiconductor, the mobility of electrons in the organic-inorganic perovskite compound increases, improving the photoelectric conversion efficiency of the solar power generation device.

[0022] The degree of crystallinity can also be evaluated as an index of crystallization by separating the scattering peaks derived from crystalline materials and the halo derived from amorphous parts detected by X-ray scattering intensity distribution measurement through fitting, determining the intensity integrals of each, and calculating the ratio of the crystalline part to the whole. The preferred lower limit of the crystallinity of the organic-inorganic perovskite compound is 30%. A crystallinity of 30% or more increases the electron mobility in the organic-inorganic perovskite compound, improving the photoelectric conversion efficiency of the solar cell. A more preferred lower limit of the crystallinity is 50%, and an even more preferred lower limit is 70%. Methods for increasing the crystallinity of the organic-inorganic perovskite compound include, for example, thermal annealing, irradiation with high-intensity light such as laser, and plasma irradiation.

[0023] The photoelectric conversion layer may further contain an organic or inorganic semiconductor in addition to the organic-inorganic perovskite compound, as long as the effects of the present invention are not impaired. The organic or inorganic semiconductor may function as a hole transport layer or an electron transport layer. Examples of the organic semiconductor include compounds having a thiophene skeleton such as poly(3-alkylthiophene). Other examples include conductive polymers having a polyparaphenylene vinylene skeleton, a polyvinyl carbazole skeleton, a polyaniline skeleton, a polyacetylene skeleton, etc. Further examples include compounds having a porphyrin skeleton such as a phthalocyanine skeleton, a naphthalocyanine skeleton, a pentacene skeleton, or a benzoporphyrin skeleton, a spirobifluorene skeleton, etc. Also included are carbon-containing materials such as carbon nanotubes, graphene, and fullerenes, which may be surface-modified.

[0024] Examples of the inorganic semiconductor include titanium oxide, zinc oxide, indium oxide, tin oxide, gallium oxide, tin sulfide, indium sulfide, zinc sulfide, CuSCN, Cu2O, CuI, MoO3, V2O5, WO3, MoS2, MoSe2, and Cu2S.

[0025] When the photoelectric conversion layer contains the organic-inorganic perovskite compound and the organic semiconductor or inorganic semiconductor, it may be a laminate in which a thin-film organic semiconductor or inorganic semiconductor portion is laminated with a thin-film organic-inorganic perovskite compound portion, or a composite film in which an organic semiconductor or inorganic semiconductor portion is composited with an organic-inorganic perovskite compound portion. A laminate is preferred in that it can be produced easily, and a composite film is preferred in that it can improve the charge separation efficiency in the organic semiconductor or inorganic semiconductor.

[0026] The thickness of the thin-film organic-inorganic perovskite compound portion is preferably 5 nm at the lower limit and 5000 nm at the upper limit. If the thickness is 5 nm or more, sufficient light absorption is possible, resulting in high photoelectric conversion efficiency. If the thickness is 5000 nm or less, the occurrence of regions where charge separation is not possible can be suppressed, leading to improved photoelectric conversion efficiency. The lower limit of the thickness is more preferably 10 nm, the upper limit is more preferably 1000 nm, the lower limit is even more preferably 20 nm, and the upper limit is even more preferably 500 nm.

[0027] When the photoelectric conversion layer is a composite film in which an organic semiconductor or inorganic semiconductor portion is combined with an organic-inorganic perovskite compound portion, the preferred lower limit of the thickness of the composite film is 30 nm, and the preferred upper limit is 3000 nm. If the thickness is 30 nm or more, sufficient light absorption is achieved, resulting in high photoelectric conversion efficiency. If the thickness is 3000 nm or less, charges can more easily reach the electrode, resulting in high photoelectric conversion efficiency. A more preferred lower limit of the thickness is 40 nm, and a more preferred upper limit is 2000 nm, with an even more preferred lower limit being 50 nm and an even more preferred upper limit being 1000 nm.

[0028] The method for forming the photoelectric conversion layer is not particularly limited, and examples thereof include vacuum deposition, sputtering, chemical vapor deposition (CVD), electrochemical deposition, and printing. Among these, the use of printing allows for the easy formation of large-area solar cells that can exhibit high photoelectric conversion efficiency. Examples of printing methods include spin coating and casting, and examples of methods using printing include roll-to-roll methods.

[0029] The power generating section may have an electron transport layer between the cathode electrode or the counter electrode and the photoelectric conversion layer. The material for the electron transport layer is not particularly limited, and examples thereof include N-type conductive polymers, N-type low-molecular-weight organic semiconductors, N-type metal oxides, N-type metal sulfides, alkali metal halides, alkali metals, surfactants, and the like. Specific examples thereof include cyano group-containing polyphenylene vinylene, boron-containing polymers, bathocuproine, bathophenanthrene, hydroxyquinolinatoaluminum, oxadiazole compounds, benzimidazole compounds, naphthalenetetracarboxylic acid compounds, perylene derivatives, phosphine oxide compounds, phosphine sulfide compounds, fluoro group-containing phthalocyanines, titanium oxide, zinc oxide, indium oxide, tin oxide, gallium oxide, tin sulfide, indium sulfide, and zinc sulfide.

[0030] The electron transport layer may consist of only a thin-film electron transport layer, but preferably includes a porous electron transport layer. In particular, when the photoelectric conversion layer is a composite film obtained by combining an organic semiconductor or inorganic semiconductor portion with an organic-inorganic perovskite compound portion, it is preferable that the composite film be formed on a porous electron transport layer, since a more complex composite film (more intricately intricate structure) can be obtained and the photoelectric conversion efficiency can be increased.

[0031] The thickness of the electron transport layer is preferably 1 nm at the lower limit and 2000 nm at the upper limit. A thickness of 1 nm or more ensures sufficient hole blocking. A thickness of 2000 nm or less reduces resistance during electron transport, resulting in high photoelectric conversion efficiency. The electron transport layer more preferably has a lower limit of 3 nm and a higher limit of 1000 nm, an even more preferred lower limit of 5 nm, and an even more preferred upper limit of 500 nm.

[0032] The power generating section may have a hole transport layer between the electrode serving as the anode / cathode or the counter electrode and the photoelectric conversion layer. The material of the hole transport layer is not particularly limited, and the hole transport layer may be made of an organic material. Examples of materials for the hole transport layer include p-type conductive polymers, p-type small-molecular-weight organic semiconductors, p-type metal oxides, p-type metal sulfides, and surfactants. Specific examples include compounds having a thiophene skeleton, such as poly(3-alkylthiophene). Other examples include conductive polymers having a triphenylamine skeleton, polyparaphenylenevinylene skeleton, polyvinylcarbazole skeleton, polyaniline skeleton, and polyacetylene skeleton. Further examples include compounds having a porphyrin skeleton, such as a phthalocyanine skeleton, a naphthalocyanine skeleton, a pentacene skeleton, or a benzoporphyrin skeleton; a spirobifluorene skeleton; molybdenum sulfide, tungsten sulfide, copper sulfide, tin sulfide, fluoro-group-containing phosphonic acid, carbonyl-group-containing phosphonic acid; and copper compounds, such as CuSCN and CuI.

[0033] The power generating unit may be formed on a substrate. Examples of the substrate include a resin film made of a heat-resistant polymer such as polyimide or polyester, a metal foil, or thin glass. In particular, from the viewpoint of flexibility and transparency, the substrate preferably contains polyethylene terephthalate, polyethylene, polypropylene, polyethylene naphthalate, polymethyl methacrylate, polystyrene, or polycarbonate.

[0034] The substrate preferably has a thickness of 30 μm or more and 200 μm or less. By having the thickness of the substrate within the above range, it is possible to further improve the handleability and flexibility. The thickness of the substrate is more preferably 50 μm or more, and even more preferably 70 μm or more. From the viewpoint of further improving flexibility, the thickness of the substrate is more preferably 150 μm or less, and even more preferably 100 μm or less.

[0035] The sealing material, which is the main component of the sealing layer, may be any material capable of sealing the power generation section. Specific examples of the sealing material include thermosetting resins, thermoplastic resins, and inorganic materials. Examples of the thermosetting resins and thermoplastic resins include epoxy resins, acrylic resins, silicone resins, phenolic resins, melamine resins, and urea resins. Other examples include butyl rubber, polyester, polyurethane, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl alcohol, polyvinyl acetate, ABS resin, polybutadiene, polyamide, polycarbonate, polyimide, polyisobutylene, and polyisoprene. Among these, when the power generation section includes an organic-inorganic perovskite compound in the photoelectric conversion layer, polybutadiene, polyisobutylene, polyisoprene, and butyl rubber, which are resins having at least one skeleton selected from the group consisting of polybutadiene, polyisobutylene, and polyisoprene, are preferred because they can further enhance the durability of the power generation layer over time.

[0036] From the viewpoint of a balance between the protection performance of the power generation section and flexibility, the thickness of the sealing layer is preferably 10 μm or more, more preferably 50 μm or more, and is preferably 1000 μm or less, and more preferably 700 μm or less. Here, the thickness of the sealing layer refers to the maximum thickness in the portion consisting of only the sealing layer.

[0037] The front sheet is placed on the outermost surface on the upper side of the flexible solar cell, and by forming a pattern such as unevenness or arcs on the surface, it serves to suppress light reflection and improve the drainage performance of the flexible solar cell surface. The material of the front sheet is not particularly limited as long as it is transparent, and examples thereof include fluorine-containing resins, vinyl chloride resins, polyethylene resins, polycarbonate resins, etc. Specific examples include polycarbonate, polyvinyl chloride, tetrafluoroethylene resin, polyvinylidene fluoride, polychlorotrifluoroethylene, etc. Among these, fluorine-containing resins are preferred because of their excellent weather resistance.

[0038] The thickness of the front sheet is not particularly limited, but from the viewpoint of the balance between light transmittance and functionality of the front sheet, it is preferably 25 μm or more, more preferably 50 μm or more, and is preferably 1000 μm or less, more preferably 300 μm or less.

[0039] The backsheet prevents the penetration of substances that cannot be prevented by the sealing layer alone, thereby enhancing the weather resistance of the flexible solar cell. In particular, with perovskite solar cells, the options for the sealing layer that comes into contact with the power generation unit are limited due to compatibility issues with the power generation unit, and commonly used resin materials with excellent water vapor permeability cannot be used. Furthermore, since moisture tends to accumulate on the installation surface of the solar power generation device, making it more susceptible to moisture-related deterioration, when an organic-inorganic perovskite compound is used in the power generation unit, it is preferable to use a material with low water vapor permeability for the backsheet. Examples of materials for the backsheet include polyethylene terephthalate.

[0040] The thickness of the back sheet is not particularly limited, but from the viewpoint of the balance between flexibility and functionality of the back sheet, it is preferably 50 μm or more, more preferably 100 μm or more, and is preferably 1000 μm or less, more preferably 500 μm or less.

[0041] The fixing member may be any member capable of penetrating the front sheet and fixing the photovoltaic power generation device to the sheet-like member, and examples thereof include thread-like members, staples, staples, and clamps. Among these, thread-like members are preferred because they are easily elastically deformable, making it easy to adjust the fixing strength by tension. In particular, photovoltaic power generation devices and sheet-like members are often laminated bodies made of various materials, often including both hard and soft layers. Therefore, the fixing strength must be appropriately adjusted. Therefore, a balanced fixation can be achieved by adjusting the tension when sewing the thread-like members. Examples of materials for the thread-like members include synthetic fibers, metal fibers, glass fibers, and carbon fibers. The thread-like members may be monofilaments or multifilaments.

[0042] The thread-like members are preferably weather-resistant, and examples of weather-resistant materials include weather-resistant nylon, PTFE, and polyester. The weather-resistant thread-like members can maintain their fixing strength for a long period of time even when installed in an outdoor exposed condition.

[0043] The filamentous member is preferably covered with a cover member. By covering the filamentous member with a cover member, even if the filamentous member itself is not weather-resistant, the fixing force can be maintained for a long period of time outdoors and the influence of water can be suppressed. Examples of the cover member include tape material and filler, and it is particularly preferable that the cover member is weather-resistant.

[0044] The cover member is preferably opaque, which makes it difficult for light to strike the thread-like members, thereby suppressing deterioration of the thread-like members due to light.

[0045] The thread-like member preferably has a thickness equivalent to 20 count or more. If the thread-like member has a thread count of 20 or more, when water comes into contact with the thread-like member, spaces are created between the threads by the water, causing the threads to expand, thereby suppressing the progress of water. The thread-like member preferably has a thread count of 10 or more, and more preferably has a thread count of 8 or more.

[0046] The diameter of the filamentous member after immersion in water is preferably 1.05 times or more when the diameter of the filamentous member in a dry state is taken as 1. By setting the diameter expansion rate of the filamentous members at or above the lower limit, when water comes into contact with the filamentous members, spaces are created between the filaments by the water, causing the filaments to expand and inhibiting the progress of water. The diameter expansion rate of the filamentous members is preferably 1.1 times or more, and even more preferably 1.15 times or more. Furthermore, from the viewpoint of preventing damage to the front sheet and sheet-like members through which the filamentous members pass, the diameter expansion rate of the filamentous members is preferably 2 times or less, more preferably 1.7 times or less, and even more preferably 1.5 times or less.

[0047] The sheet-like member corresponds to the installation location of the solar power generation device of the present invention. Examples of the sheet-like member include a resin sheet, a fiber-reinforced sheet, a metal thin film laminated sheet, and a fiber sheet. Among these, a fiber sheet is preferred because of its good drainage of water such as rain, and it is more preferable that it contains inorganic fibers from the viewpoint of improving strength. On the other hand, since a fiber sheet is permeable to water vapor, when the sheet-like member is a fiber sheet, it is preferable to use a back sheet with low water vapor permeability.

[0048] The sheet member may be adhered to the back sheet and the front sheet. The front sheet and the back sheet are bonded to the sheet-like member, thereby further increasing the fixing force.

[0049] When the sheet-like member is sewn with the thread-like member, it has through-holes that communicate with the through-holes of the front seat, but when it is fixed with the tacker or the like, the staples of the tacker do not need to penetrate the sheet-like member as long as the solar power generation device can be fixed, so the sheet-like member does not necessarily need to have through-holes. Also, when the solar power generation device is fixed with the tacker or the like, the installation member and installation location for the solar power generation device are not limited to a sheet-like member.

[0050] The thickness of the sheet-like member is not particularly limited, but from the viewpoint of ensuring strength, it is preferably 0.2 mm or more, more preferably 0.5 mm or more, and even more preferably 1 mm or more, and from the viewpoint of ensuring flexibility, it is preferably 5 mm or less, more preferably 4 mm or less, and even more preferably 3 mm or less.

[0051] The through holes are formed by the passage of the fixing member, and the diameter of the through holes is approximately the same as the diameter of the fixing member. Because the through holes formed by the passage of the fixing member have a diameter approximately the same as the diameter of the fixing member, it is possible to prevent moisture from entering the through holes from the outside. Furthermore, from the viewpoint of facilitating the passage of the fixing member, the front sheet and the sheet-like member may have holes smaller in diameter than the fixing member at positions where the fixing member passes. By providing holes smaller in diameter than the fixing member in advance in the portions where the fixing member will pass, the formed through holes compress the fixing member, reducing the gap between the fixing member and the through holes, thereby further preventing moisture from entering.

[0052] In the solar power generation device of the present invention, the minimum distance between the sealing layer and the through hole is preferably 1 mm or more. When the minimum distance between the sealing layer and the through-hole is equal to or greater than the above lower limit, moisture is less likely to penetrate into the sealing layer, thereby improving durability. The minimum distance between the sealing layer and the through-hole is more preferably 2 mm or more, and even more preferably 3 mm or more. There is no particular upper limit to the minimum distance between the sealing layer and the through-hole, but from the viewpoint of further improving the area efficiency of power generation, it is preferably 10 mm or less.

[0053] In the solar power generation device of the present invention, it is preferable that the minimum distance between the power generation section and the through hole is 5 mm or more. When the minimum distance between the power generation section and the through hole is equal to or greater than the above lower limit, moisture is less likely to penetrate into the sealing layer, thereby improving durability. The minimum distance between the power generation section and the through hole is more preferably 10 mm or more, and even more preferably 20 mm or more. There is no particular upper limit to the minimum distance between the power generation section and the through hole, but from the perspective of further improving the area efficiency of power generation, it is preferably 100 mm or less.

[0054] The manufacturing method for the power generation unit, sealing layer, front sheet, and back sheet portions of the solar power generation device of the present invention is not particularly limited, but a method of sandwiching and laminating the power generation unit between the sealing layers of a sheet (sheet A) having a sealing layer laminated inside the edge of the front sheet and a sheet (sheet B) having a sealing layer laminated on the back sheet is preferred, as this method makes it easy to manufacture over a large area.

[0055] A roll-to-roll method can be used, for example, to laminate the sheet A, the power generation section, and the sheet B. By using the roll-to-roll method, large-area solar cells can be continuously produced.

[0056] (Embodiment 2) FIG. 3 is a cross-sectional view showing a schematic diagram of another example of the solar power generation device of the present invention. The solar power generation device of embodiment 2 includes, in addition to the solar power generation device of embodiment 1, a frame member 5 that is placed on the front sheet 13 so as to surround the area where the side surfaces of the front sheet 13 and the sealing layer 12 meet. By surrounding the side surfaces of the sealing layer 12 with the front sheet 13 and the frame member 5, the area around the power generation unit 11 can be reinforced and durability can be further improved by further suppressing the intrusion of moisture from the side surfaces of the sealing layer 12. The details of the power generation unit 11, sealing layer 12, front sheet 13, back sheet 14, sheet-like member 2, and fixing member 4 in the solar power generation device of embodiment 2 are the same as those of the solar power generation device of embodiment 1.

[0057] The material of the frame member is not particularly limited as long as it has a certain degree of strength and excellent water vapor barrier performance, and examples thereof include inorganic materials such as metals, tape materials, fillers, caulking materials, etc. Among these, tape materials and caulking materials that can follow deformation are preferred because the sheet-like member has flexibility.

[0058] The thickness of the frame member is not particularly limited, but from the viewpoint of a balance between reinforcement performance, water vapor barrier performance, and flexibility, it is preferably 200 μm or more, more preferably 300 μm or more, and is preferably 10,000 μm or less, and even more preferably 5,000 μm or less.

[0059] (Embodiment 3) FIG. 4 is a cross-sectional view showing a schematic diagram of another example of the solar power generation device of the present invention. In the solar power generation device of embodiment 3, the power generation unit 11 and the sealing layer 12 are laminated inside the peripheral portion of the back sheet 14, and the light-receiving surface side of the back sheet 14 is in contact with the surface of the front sheet 13 opposite the light-receiving surface side. Furthermore, the through-holes 3 penetrate the front sheet 13, the back sheet 14, and the sheet-like member 2. Like the front sheet 13, the peripheral portion of the back sheet 14 is also positioned outside the peripheral portions of the power generation unit 11 and the sealing layer 12, resulting in a structure in which the power generation unit 11 and the sealing layer 12 are enveloped by the front sheet 13 and the back sheet 14, making it more difficult for moisture to penetrate the sealing layer and further improving durability. The details of the power generation unit 11, the sealing layer 12, the front sheet 13, the back sheet 14, the sheet-like member 2, and the fixing member 4 in the solar power generation device of embodiment 3 are the same as those of the solar power generation device of embodiment 1.

[0060] (Embodiment 4) FIG. 5 is a cross-sectional view showing a schematic diagram of another example of the solar power generation device of the present invention. In the solar power generation device of embodiment 4, the end of the front sheet 13 of embodiment 1 wraps around to the surface opposite the light-receiving surface of the sheet-shaped member 2. By arranging the front sheet 13 in this manner, even if moisture penetrates from the interface between the front sheet 13 and the sheet-shaped member 2, the path to the sealing layer becomes longer, thereby further improving durability.

[0061] The wrap-around width of the front sheet, i.e., the distance between the edge of the front sheet and the edge of the sheet-like member, is preferably 5 mm or more and 100 mm or less. Having the wrap-around width of the front sheet in the above range can further increase durability. From the viewpoint of further improving durability while reducing costs, the wrap-around width of the front sheet is more preferably 10 mm or more, even more preferably 15 mm or more, more preferably 50 mm or less, and even more preferably 30 mm or less. [Explanation of symbols]

[0062] 1. Solar power generation equipment 11 Power Generation Department 12 Sealing layer 13 Front seats 14 back seat 2. Sheet-like member 3 Through holes 4 Fixing member 5 Frame members

Claims

1. A power generation unit; a sealing layer that seals the entire power generation section; a front sheet laminated on the light-receiving surface side of the sealing layer; a back sheet laminated on a surface of the sealing layer opposite to the light-receiving surface; through holes provided along at least one side of the front sheet and penetrating the front sheet at a plurality of locations; A solar power generation device having a fixing member passing through the through hole, the power generation unit and the sealing layer are laminated inside the peripheral edge portion of the front sheet, the front sheet covers the entire light-receiving surface and side surfaces of the sealing layer, the through-hole is formed by the passage of the fixing member and does not come into contact with the sealing layer; the fixing member is a thread-like member, The solar power generation device is characterized in that the diameter of the filamentous member after immersion in water is 1.05 times or more when the diameter of the filamentous member in a dry state is 1.

2. 2. The solar power generation device according to claim 1, further comprising a frame member disposed on the front sheet so as to surround a portion where the front sheet and a side surface of the sealing layer contact each other.

3. 3. The solar power generation device according to claim 1, wherein the minimum distance between the sealing layer and the through-hole is 1 mm or more.

4. 3. The solar power generation device according to claim 1, wherein the minimum distance between the power generation section and the through hole is 5 mm or more.

5. a sheet-like member on the side opposite to the light receiving surface of the front sheet and the back sheet; 3. The solar power generation device according to claim 1, wherein the through-hole penetrates the front sheet and the sheet-like member.

6. the power generation unit and the sealing layer are laminated inside the peripheral edge of the back sheet, a surface of the back sheet on the light-receiving side and a surface of the front sheet on the opposite side to the light-receiving side are in contact with each other; The solar power generation device according to claim 1 or 2, wherein the through-hole penetrates through the front sheet and the back sheet.

Images