Solar cell panel

Abstract

A solar cell panel according to an aspect 1 of an embodiment of the present invention has solar cell modules, photoelectric conversion layers, first sealing films, metal sheets, and metal fixtures. The solar cell modules are disposed in alignment along a first surface. The photoelectric conversion layers are included in the solar cell modules. A light entering side of the first surface is defined as the front side. The first sealing films are disposed on the back sides of the photoelectric conversion layers and have metal layers. Each of the metal sheets is disposed on the front sides and the back sides of adjacent solar cell modules among the solar cell modules, and covers peripheral portions of the adjacent solar cell modules. Each of the metal fixtures is disposed between the adjacent solar cell modules, and fixes the metal sheets in a state in which the adjacent solar cell modules are sandwiched by the metal sheets. The metal layers, the metal sheets, and the metal fixtures are made of pure metals or alloys having the same metal as the main component.

Description

Solar cell panel

[0001] An embodiment of the present invention relates to a solar cell panel.

[0002] A solar cell panel in which a plurality of solar cell modules are connected is used. The solar cell panel is installed outdoors. There is a need for a solar cell panel that can suppress deterioration.

[0003] Japanese Patent Application Laid-Open No. 2017-48506

[0004] The problem to be solved by the present invention is to provide a solar cell panel that can suppress deterioration.

[0005] The solar cell panel of Aspect 1 of the embodiment has a solar cell module, a photoelectric conversion layer, a first sealing film, a metal plate, and a metal fixture. The solar cell modules are arranged in alignment along the first surface. The photoelectric conversion layer is included in each of the solar cell modules. The light incident side of the first surface is defined as the front side, and the opposite side of the front side of the first surface is defined as the back side. The first sealing film is disposed on the back side of the photoelectric conversion layer and has a metal layer. The metal plate is disposed on the front side and the back side of adjacent solar cell modules among the solar cell modules and covers the peripheral portions of the adjacent solar cell modules. The metal fixture is disposed between adjacent solar cell modules and fixes the metal plate in a state where the adjacent solar cell modules are sandwiched by the metal plate. The metal layer, the metal plate, and the metal fixture are made of a pure metal or an alloy in which the main component metal is the same.

[0006] The solar cell panel of Aspect 2 further has an inorganic barrier layer and a second sealing film on the premise of the solar cell panel described in Aspect 1. The inorganic barrier layer is disposed on the front side of the photoelectric conversion layer. The second sealing film is disposed on the front side of the inorganic barrier layer.

[0007] The solar cell panel of Aspect 3 is based on the solar cell panel described in Aspect 1 or 2. The natural potential difference of the materials constituting the metal layer, the metal plate, and the metal fixture in a 1M sodium chloride aqueous solution at 25°C is 100 mV or less.

[0008] The solar cell panel of embodiment 4 is based on the solar cell panel described in any one of embodiments 1 to 3. The metal layer, metal plate, and metal fastener are made of aluminum or an aluminum alloy.

[0009] The solar cell panel of Embodiment 5 is based on the solar cell panel described in Embodiment 1 or 2. The photoelectric conversion layer contains a halogen element.

[0010] The solar cell panel of Embodiment 6 is based on the solar cell panel described in Embodiment 2. The inorganic barrier layer is a glass layer with a thickness of 250 μm or less.

[0011] The solar panel of Embodiment 7 is based on the solar panel described in any one of Embodiments 1 to 6. The metal fastener is a rivet.

[0012] The solar panel of embodiment 8 is based on the solar panel described in embodiment 7. The rivet heads are flat.

[0013] The solar cell panel of Embodiment 9 is based on the solar cell panel described in Embodiment 2. The inorganic barrier layer contains silicon nitride.

[0014] The solar cell panel of embodiment 10 is based on the solar cell panel described in embodiment 2, 6, or 9. The second sealing film contains a silicone polymer.

[0015] The solar cell panel of embodiment 11 is based on the solar cell panel described in any one of embodiments 1 to 10. The thickness of the solar cell module is 2 mm or less.

[0016] The solar panel of embodiment 12 is based on the solar panel described in any one of embodiments 1 to 11. The weight per square meter of the solar module is 2 kg or less.

[0017] The solar cell panel of embodiment 13 is based on the solar cell panel described in any one of embodiments 1 to 12, and further comprises a packing placed between a metal fastener and a metal plate.

[0018] The solar cell panel of embodiment 14 is based on the solar cell panel described in any one of embodiments 1 to 12, and further includes a sealing material that covers the contact portion between the metal fastener and the metal plate.

[0019] The solar cell panel of embodiment 15 is based on the solar cell panel described in any one of embodiments 1 to 14. The first metal plate, which is positioned on the back side of the solar cell module, has a support portion that supports the wiring of the solar cell module. The support portion protrudes from the first surface on the back side of the first metal plate to the back side.

[0020] The solar cell panel of embodiment 16 is based on the solar cell panel described in embodiment 15. The shape of the support portion is L-shaped, U-shaped, or O-shaped when viewed from a horizontal direction parallel to the first surface.

[0021] The solar cell panel of embodiment 17 is based on the solar cell panel described in embodiment 15 or 16. The shape of the support portion in a cross-section parallel to the first surface is tapered towards the upper side in the vertical direction.

[0022] The solar cell panel of embodiment 18 is based on the solar cell panel described in embodiment 17. The shape of the support portion in the cross-section parallel to the first surface is curved on the upper side.

[0023] Front view of the solar panel in the embodiment. Cross-sectional view of the solar panel along line II-II in Figure 1. Cross-sectional view of the solar panel in the first modified example of the embodiment. Cross-sectional view of the solar panel in the second modified example of the embodiment. Rear view of the solar panel in part of Figure 2. Cross-sectional view of the support along line VI-VI in Figure 5. Cross-sectional view of the support in the third modified example of the embodiment. Cross-sectional view of the support in the fourth modified example of the embodiment. Cross-sectional view of the bottom of the support along line IX-IX in Figure 6. Cross-sectional view of the bottom of the support in the fifth modified example of the embodiment. Cross-sectional view of the bottom of the support in the sixth modified example of the embodiment. Cross-sectional view of the bottom of the support in the seventh modified example of the embodiment. Cross-sectional view of the bottom of the support in the eighth modified example of the embodiment. Cross-sectional view of the bottom of the support in the first comparative example. Cross-sectional view of the bottom of the support in the second comparative example.

[0024] The solar cell panel of the embodiment will be described below with reference to the drawings. Figure 1 is a front view of the solar cell panel 1 in the embodiment. The solar cell panel 1 is arranged along a first surface. The first surface is flat, but it may also be curved. In order to allow a lot of light to enter the solar cell panel 1, the first surface intersects the vertical direction at an angle perpendicular to it or at an angle other than perpendicular.

[0025] In this application, the Z, X, and Y directions of the Cartesian coordinate system are defined as follows: The Z direction is perpendicular to the first surface and is the thickness direction of the solar cell panel 1. The +Z side (front side) is the light incident side of the solar cell panel 1. The -Z side (back side) is the opposite side of the +Z side. The X and Y directions are parallel to the first surface. For example, the X direction is the horizontal direction.

[0026] The solar cell panel 1 comprises a solar cell module 10, a metal plate 20, and a metal fastener 25. Multiple solar cell modules 10 are arranged in a matrix along a first surface. Figure 2 is a cross-sectional view of the solar cell panel 1 along line II-II in Figure 1. Each solar cell module 10 includes a photoelectric conversion layer 11, a first sealing film 12, an inorganic barrier layer 13, and a second sealing film 14.

[0027] The photoelectric conversion layer 11 can be a perovskite layer having halogen elements. The perovskite structure consists of, for example, ions A1, A2, and X, where A1A2X ３ It can be expressed as follows. When ion A2 is smaller than ion A1, a perovskite structure may be present. A perovskite structure has, for example, a cubic unit cell. Ions A1 are located at each vertex of the cubic crystal, and ion A2 is located at the body center. Ions X are located at the centers of each face of the cubic crystal, with ion A2 at the body center.

[0028] A2X ６ The orientation of the octahedron is easily distorted by interaction with ion A1. Due to the decrease in symmetry, a Mott transition occurs, and the valence electrons that were localized in ion M can spread out as a band. Ion A1 is CH ３ NH ３It is preferable that ion A2 is at least one of Pb and Sn. It is preferable that ion X is at least one of Cl, Br, and I. Each of the materials constituting ion A1, ion A2, and ion X may be a single material or a mixture of materials. The thickness of the perovskite layer is, for example, 200 nm to 800 nm.

[0029] When forming solar cells, it is preferable to use a coating method in which the material is dissolved in a solvent and applied to the electrode (or intermediate layer). Examples of solvents that can be used include unsaturated hydrocarbon solvents, halogenated aromatic hydrocarbon solvents, halogenated saturated hydrocarbon solvents, and ethers. Examples of unsaturated hydrocarbon solvents include toluene, xylene, tetralin, decalin, mesitylene, n-butylbenzene, sec-butylbenzene, and tert-butylbenzene. Examples of halogenated aromatic hydrocarbon solvents include chlorobenzene, dichlorobenzene, and trichlorobenzene. Examples of halogenated saturated hydrocarbon solvents include carbon tetrachloride, chloroform, dichloromethane, dichloroethane, chlorobutane, bromobutane, chloropentane, chlorohexane, bromohexane, and chlorocyclohexane. Examples of ethers include tetrahydrofuran and tetrahydropyran. It is more preferable to use halogenated aromatic solvents. Furthermore, DMF (N,N-dimethylformamide), DMSO (dimethyl sulfoxide), 2-propanol, and γ-butyrolactone can also be used. These solvents can be used individually or in combination. There are no particular restrictions as long as the solvent can dissolve the material.

[0030] Methods for applying a solution to form the photoelectric conversion layer 11 include spin coating, dip coating, casting, bar coating, roll coating, wire bar coating, spray coating, screen printing, gravure printing, flexographic printing, offset printing, gravure-offset printing, dispenser coating, nozzle coating, capillary coating, inkjet coating, and meniscus coating. These coating methods can be used individually or in combination.

[0031] The first sealing film 12 is positioned on the back side of the photoelectric conversion layer 11. The first sealing film 12 constitutes the back surface of the solar cell module 10. The first sealing film 12 has at least a metal layer. The metal layer is made of aluminum or an aluminum alloy, which is lightweight and has weather resistance and waterproofing properties. The constituent materials of the metal layer will be described in detail later. The first sealing film 12 may have a PET (polyethylene terephthalate) layer on the front side of the metal layer. The first sealing film 12 may have a flame-retardant PET layer on the back side of the metal layer.

[0032] The inorganic barrier layer 13 is positioned on the front side of the photoelectric conversion layer 11. The inorganic barrier layer 13 includes silicon oxide, silicon nitride, silicon carbide, aluminum oxide, titanium carbide, titanium oxide, zirconium oxide, etc., and composites thereof. The inorganic barrier layer 13 may also contain polymers. A multilayer structure of inorganic barrier layer 13 and polymer layers is likely to improve flexibility. The water vapor transmission rate (WVTR) of the inorganic barrier layer 13 is 10 －３ (g / m ２ / day) is preferable, and 10 －４ The following is even more preferable: The inorganic barrier layer 13 suppresses the degradation of the photoelectric conversion layer 11 due to moisture permeation.

[0033] The inorganic barrier layer 13 can be a glass layer with a thickness of 250 μm or less. Alkali-free glass is preferred as the material for the glass layer because it is less susceptible to ion contamination. If the inorganic barrier layer 13 is thicker than 250 μm, its flexibility becomes extremely limited, and it also becomes heavy. The thickness of the inorganic barrier layer 13 is preferably between 50 μm and 200 μm. If it is thinner than 50 μm, it becomes extremely brittle and difficult to handle. If it is thicker than 200 μm, the decrease in flexibility becomes significant. The inorganic barrier layer 13 may also contain silicon nitride. This facilitates the thinning of the inorganic barrier layer 13.

[0034] The second sealing film 14 is formed on at least the front side of the inorganic barrier layer 13. In addition, the second sealing film 14 covers the X and Y side surfaces of the photoelectric conversion layer 11 and the inorganic barrier layer 13. Furthermore, the second sealing film 14 may be formed between the photoelectric conversion layer 11 and the first sealing film 12. It is preferable that the second sealing film 14 contains a silicone polymer. Silicone polymers are highly flexible and can suppress damage to the inorganic barrier layer 13 caused by hailstorms, etc. Also, silicone polymers have high fire resistance and water repellency, which can extend the lifespan of the solar cell panel 1. A weather-resistant fluororesin film may be attached to the front side of the second sealing film 14 containing the silicone polymer.

[0035] By making the thickness of the solar cell module 10 2 mm or less, flexibility is ensured and the weight is reduced. Furthermore, by making the thickness of the solar cell module 10 0.5 mm or more, durability is improved. By making the weight of the solar cell module 10 2 kg or less per square meter, installation and replacement of the solar cell module 10 becomes easier.

[0036] The metal plates 20 are arranged on the front and back sides of the solar cell module 10. The metal plate 20 on the back side is the first metal plate 21, and the metal plate 20 on the front side is the second metal plate 22. The solar cell module 10 is sandwiched between the pair of metal plates 20. As shown in Figure 1, the metal plates 20 are arranged between adjacent solar cell modules 10 in the X and Y directions. Between adjacent solar cell modules 10 in the X direction, a metal plate 20 extending in the Y direction is arranged. Between adjacent solar cell modules 10 in the Y direction, a metal plate 20 extending in the X direction is arranged. The metal plates 20 cover the peripheral edges of adjacent solar cell modules 10. As shown in Figure 2, it is preferable that the metal plates 20 cover the peripheral edges of the solar cell module 10 so as not to overlap with the photoelectric conversion layer 11 in the Z direction. This can suppress a decrease in the power generation efficiency of the solar cell panel 1. The metal plates 20 are made of aluminum or an aluminum alloy, etc., which is lightweight and has weather resistance and waterproofing properties. The constituent materials of the metal plates 20 will be described in detail later. The thickness of the metal plate 20 is preferably 0.5 to 2 mm.

[0037] The metal fasteners 25 are positioned between adjacent solar cell modules 10 in the X and Y directions. The metal fasteners 25 fix the pair of metal plates 20 in a state where adjacent solar cell modules 10 are sandwiched between the pair of metal plates 20. As shown in Figure 1, multiple metal fasteners 25 are positioned between adjacent solar cell modules 10. This firmly connects the adjacent solar cell modules 10. It is also desirable to position metal fasteners 25 at the intersection of the metal plate 20 extending in the X direction and the metal plate 20 extending in the Y direction. This enhances the integrity of the solar cell panel 1.

[0038] The metal fastener 25 is made of lightweight, weather-resistant, and waterproof aluminum or aluminum alloy. The constituent materials of the metal fastener 25 will be described in detail later. The metal fastener 25 is preferably a rivet. The body 25b of the rivet is inserted into the through hole of the pair of metal plates 20, and the head 25a of the rivet abuts against the outer surface of the second metal plate 22 on the front side. A rivet tool (riveter) is operated on the front side of the solar cell panel 1. As a result, the tip of the body 25b bulges on the outside of the first metal plate 21 on the back side, forming the back fixing portion 25c of the rivet. In this way, the pair of metal plates 20 are easily fixed. It is preferable that the rivet has a flat head 25a (flat rivet). This suppresses the snagging of objects on the head 25a of the rivet, making the installation of the solar cell panel 1 easier.

[0039] Multiple solar cell modules 10 are connected by the aforementioned metal plate 20 and metal fastener 25 to form a solar cell panel 1. This allows for easy and secure connection of multiple solar cell modules 10 to form a large-area, lightweight solar cell panel 1. Furthermore, maintenance of the solar cell panel 1 becomes easier.

[0040] Since the solar cell panel 1 is disposed outdoors, rainwater adheres to the solar cell panel 1. As described above, the solar cell panel 1 includes three types of metal members: the metal layer of the first sealing film 12, the metal plate 20, and the metal fixture 25. There is concern about corrosion of the three types of metal members due to the adhesion of rainwater. The three types of metal members are formed of a pure metal or an alloy in which the main component metal is the same. Thereby, the difference in ionization tendency of the three types of metal members is reduced, and corrosion of the three types of metal members can be suppressed.

[0041] The three types of metal members are preferably formed of pure aluminum or an aluminum alloy that is lightweight and has weather resistance and waterproofness. Pure aluminum and aluminum alloys have the same main component metal, aluminum. Examples of aluminum alloys include alloys with copper (Cu), manganese (Mn), silicon (Si), magnesium (Mg), zinc (Zn), nickel (Ni), iron (Fe), etc. Among these metals, an alloy with a plurality of metals may also be used. The natural potential difference of the materials constituting the three types of metal members in a 1M sodium chloride (NaCl) aqueous solution at 25°C is preferably 100 mV or less, and more preferably 50 mV or less. Aluminum alloys with a natural potential difference close to that of pure aluminum (Al) are aluminum-nickel (Al-Ni) alloys and aluminum-manganese (Al-Mn) alloys. Therefore, it is desirable to form the three types of metal members of pure aluminum, an aluminum-nickel alloy, or an aluminum-manganese alloy. Thereby, corrosion of the three types of metal members can be suppressed.

[0042] Figure 3 is a cross-sectional view of the solar cell panel 1 in the first modification of the embodiment. The solar cell panel 1 of the first modification has a packing 27. The packing 27 is formed of a water-repellent material such as a fluororesin. The packing 27 is disposed between the metal fixture 25 exposed to the outside of the solar cell panel 1 and the metal plate 20. That is, the packing 27 is disposed between the head 25a of the rivet and the second metal plate 22 and between the back-side fixing portion 25c of the rivet and the first metal plate 21. Thereby, the intrusion of moisture from between the metal fixture 25 and the metal plate 20 into the interior of the solar cell panel 1 can be suppressed. As a result, the deterioration of the solar cell panel 1 can be suppressed.

[0043] Figure 4 is a cross-sectional view of the solar cell panel 1 in the second modification of the embodiment. The solar cell panel 1 of the second modification has a sealing material 28. The sealing material 28 is formed of a water-repellent material such as a fluororesin. The sealing material 28 covers the contact portion between the metal fixture 25 exposed to the outside of the solar cell panel 1 and the metal plate 20. Further, the sealing material 28 may cover the entire head 25a and the back-side fixing portion 25c of the rivet. Thereby, the intrusion of moisture from between the metal fixture 25 and the metal plate 20 into the interior of the solar cell panel 1 can be suppressed. As a result, the deterioration of the solar cell panel 1 can be suppressed.

[0044] Figure 5 is a rear view of the solar cell panel 1 in the portion of FIG. 2. The solar cell module 10 has a junction box (terminal box) 16 on the back side. The positive and negative terminals of the solar cell module 10 are installed in the junction box 16. Wiring 17 is connected to the positive and negative terminals. The junction boxes 16 of adjacent solar cell modules 10 are connected by the wiring 17.

[0045] The first metal plate 21, positioned on the back side of the solar cell module 10, has a support portion 30 that supports the wiring 17. In the example shown in Figure 5, the first metal plate 21, extending in the Y direction, is positioned between adjacent solar cell modules 10 in the X direction. The support portion 30 is fixed to the first metal plate 21 at a position corresponding to the middle of the solar cell module 10 in the Y direction. The support portion 30 is positioned between metal fasteners 25 that are spaced apart in the Y direction. The support portion 30 is formed from the same metal material as the first metal plate 21. The support portion 30 is fixed to the first metal plate 21 by adhesive, welding, or the like.

[0046] Figure 6 is a cross-sectional view of the support portion 30 along the line VI-VI in Figure 5. The first metal plate 21, together with the solar panel, is inclined with respect to the vertical direction. Hereafter, the side diagonally upward, the +Y side, may be referred to as the upper side, and the side diagonally downward, the -Y side, may be referred to as the lower side. The support portion 30 protrudes from the first surface S on the back side of the first metal plate 21. When viewed from the X direction, which is the horizontal direction parallel to the first surface S, the support portion 30 is L-shaped. The L-shaped support portion 30 is easy to process and install. The support portion 30 rises from the first surface S to the back side and bends to the +Y side. The wiring 17 is inserted into the inside of the support portion 30 through the opening on the upper side of the support portion 30. The wiring 17 is supported at the bottom on the lower side of the support portion 30. This restricts the movement of the wiring 17, thereby suppressing loosening or detachment of the wiring 17 at the connection point with the junction box 16.

[0047] Figure 7 is a cross-sectional view of the support portion 30 in a third modified example of the embodiment. In the third modified example, the support portion 30 is U-shaped when viewed from the X direction. The U-shaped support portion 30 is easy to install and allows the wiring 17 to move to some extent. One end of the support portion 30 is fixed to the first metal plate 21. The space between the one end and the other end of the support portion 30 opens upwards. The wiring 17 is inserted into the inside of the support portion 30 through the upper opening. The wiring 17 is supported at the lower bottom of the support portion 30. This restricts the movement of the wiring 17, thereby preventing loosening or falling out of the wiring 17.

[0048] Figure 8 is a cross-sectional view of the support portion 30 in a fourth modified example of the embodiment. In the fourth modified example, the support portion 30 is O-shaped when viewed from the X direction. The O-shaped support portion 30 makes it difficult for the wiring 17 to come loose. The wiring 17 is inserted into the inside of the support portion 30 from the X direction. The wiring 17 is supported at the lower bottom of the support portion 30. This restricts the movement of the wiring 17, thereby suppressing loosening or detachment of the wiring 17.

[0049] Figure 9 is a cross-sectional view of the bottom of the support portion 30 along the line IX-IX in Figure 6. Figures 10-13 are cross-sectional views of the bottom of the support portion 30 in the 5th-8th modified example of the embodiment. Figures 14-15 are cross-sectional views of the bottom of the support portion 30 in the 1st-2nd comparative example. Figures 9-15 are cross-sectional views parallel to the first surface S of the first metal plate 21.

[0050] In the first comparative example shown in Figure 14, the cross-sectional shape of the bottom of the support part 30 is triangular with a horizontal line on the upper side. In the second comparative example shown in Figure 15, the cross-sectional shape of the bottom of the support part 30 is pentagonal with a horizontal line on the upper side. Because the cross-sectional shape has a horizontal line on the upper side, moisture tends to remain on the upper surface of the bottom of the support part 30. Since the wiring 17 is supported at the bottom of the support part 30, the wiring 17 is in contact with moisture for a longer period of time. As a result, corrosion of the wiring 17 is a concern.

[0051] In the embodiment shown in Figure 9, the cross-sectional shape of the bottom of the support portion 30 is circular. In the fifth modified example shown in Figure 10, the cross-sectional shape of the bottom of the support portion 30 is elliptical. In the sixth modified example shown in Figure 11, the cross-sectional shape of the bottom of the support portion 30 is a semicircular shape with an arc curve on the upper side. In the seventh modified example shown in Figure 12, the cross-sectional shape of the bottom of the support portion 30 is a polygonal shape (triangular) with a vertex on the upper side. In the eighth modified example shown in Figure 13, the cross-sectional shape of the bottom of the support portion 30 is a pentagonal shape with a vertex on the upper side. The cross-sectional shapes of the bottom of these support portions 30 are tapered towards the upper side in the vertical direction. Moisture is less likely to remain at the bottom of the support portion 30, and the time that the wiring 17 is in contact with moisture is shortened. As a result, corrosion of the wiring 17 is suppressed.

[0052] In particular, the cross-sectional shape of the bottom of the support portion 30 is preferably curved on the upper side. The circular shape shown in Figure 9, the elliptical shape shown in Figure 10, and the semicircular shape shown in Figure 11 are all shapes with a curved upper side. In these cases, the upper surface of the bottom of the support portion 30 is curved, so the wiring 17 that comes into contact with the bottom of the support portion 30 is less likely to be damaged. As a result, deterioration of the wiring 17 is suppressed.

[0053] (Example 1) The solar cell module 10 is a perovskite solar cell module with an energy conversion efficiency of 14% per sun. The thickness of the solar cell module 10 is 2 mm and its weight is 1.9 kg / m ２ The dimensions are 30 x 40 cm. The solar cell module 10 has a laminated film as the first sealing film 12, in which a 30 μm thick aluminum metal film is sandwiched between a 50 μm thick PET film (front side) and a flame-retardant 80 μm thick white PET film (back side), a 200 μm thick glass layer as the inorganic barrier layer 13, and silicone rubber and silicone gel as the second sealing film. The metal plate 20 is an aluminum-nickel alloy plate with a thickness of 0.3 mm. The metal fastener 25 is a flat rivet also made of aluminum-nickel alloy. These are combined as shown in Figure 2 to create the solar cell panel 1. The support part 30 is L-shaped as shown in Figure 6, and the cross-sectional shape of the bottom is circular as shown in Figure 9. The wiring 17 is supported by this support part 30 as shown in Figure 5. This solar cell panel 1 is installed on an outdoor roof to generate electricity from sunlight for six months. No corrosion was observed in the three metal components: the metal layer of the first sealing film 12, the metal plate 20, and the metal fastener 25. Furthermore, no change was observed in the connection between the wiring 17 and the junction box 16.

[0054] (Comparative Example 1) Instead of using aluminum-nickel alloy rivets as metal fasteners 25, SUS304 rivets are used. The remaining parts are constructed in the same manner as in Example 1 to create the solar panel 1. This solar panel 1 is installed on an outdoor roof and generates electricity using sunlight for six months. Corrosion is observed at the contact point between the rivet, which is the metal fastener 25, and the metal plate 20. From the results of Example 1 and Comparative Example 1, it can be confirmed that corrosion of the three types of metal members can be suppressed by constructing the three types of metal members from pure metals or alloys in which the main metal component is the same.

[0055] (Comparative Example 2) The support portion 30 is omitted, leaving the wiring 17 unsupported. The solar panel 1 is constructed in the same manner as in Example 1 for the rest of the components. This solar panel 1 is installed on an outdoor roof and generates electricity using sunlight for six months. Loosening is observed at the connection between the wiring 17 and the junction box 16, and the wiring 17 is in danger of coming off the junction box 16. From the results of Example 1 and Comparative Example 2, it is confirmed that supporting the wiring 17 with the support portion 30 can suppress loosening and detachment of the wiring 17 at the connection with the junction box 16.

[0056] As detailed above, the solar cell panel 1 of the embodiment comprises a solar cell module 10, a photoelectric conversion layer 11, a first sealing film 12, a metal plate 20, and a metal fixing device 25. The solar cell modules 10 are arranged in alignment along a first surface. The photoelectric conversion layer 11 is included in each of the solar cell modules 10. The side of the first surface where light is incident is the front side, and the side opposite the front side of the first surface is the back side. The first sealing film 12 is located on the back side of the photoelectric conversion layer 11 and has a metal layer. The metal plate 20 is located on the front and back sides of adjacent solar cell modules 10 and covers the peripheral edges of adjacent solar cell modules 10. The metal fixing device 25 is located between adjacent solar cell modules 10 and fixes the metal plate 20 in a state where the adjacent solar cell modules 10 are sandwiched between the metal plate 20. The metal layer of the first sealing film 12, the metal plate 20, and the metal fixing device 25 are composed of pure metals or alloys in which the main metal component is the same. This reduces the difference in ionization tendencies among the three types of metal components, thereby suppressing corrosion of the three types of metal components. Consequently, the degradation of the solar cell panel 1 can be suppressed.

[0057] The solar cell panel 1 further comprises an inorganic barrier layer 13 and a second sealing film 14. The inorganic barrier layer 13 is positioned on the front side of the photoelectric conversion layer 11. The second sealing film 14 is positioned on the front side of the inorganic barrier layer 13. The inorganic barrier layer 13 suppresses the degradation of the photoelectric conversion layer 11 due to moisture permeation. The second sealing film 14 suppresses damage to the inorganic barrier layer 13. This makes it possible to suppress the degradation of the solar cell panel 1.

[0058] The natural potential difference of the materials constituting the metal layer of the first sealing film 12, the metal plate 20, and the metal fastener 25 in a 1M sodium chloride aqueous solution at 25°C is 100 mV or less. This reduces the difference in ionization tendencies of the three types of metal components, thereby suppressing corrosion of the three types of metal components. Therefore, the degradation of the solar cell panel 1 can be suppressed.

[0059] The metal layer of the first sealing film 12, the metal plate 20, and the metal fastener 25 are made of aluminum or an aluminum alloy. Aluminum and aluminum alloys are lightweight and have weather resistance and waterproofing properties. This helps to suppress the degradation of the solar cell panel 1.

[0060] The photoelectric conversion layer 11 contains halogen elements. The photoelectric conversion layer 11 with a perovskite structure contains halogen elements. Halogen elements make metals prone to corrosion. Even in this case, the configuration of the embodiment suppresses corrosion of the three types of metal components. Therefore, the degradation of the solar cell panel 1 can be suppressed.

[0061] The inorganic barrier layer 13 is a glass layer with a thickness of 250 μm or less. This increases the flexibility of the solar cell panel 1.

[0062] The metal fastener 25 is a rivet. This allows the pair of metal plates 20 to be easily fixed together.

[0063] The head 25a of the rivet is flat. This reduces the likelihood of objects getting caught on the head 25a of the rivet, making it easier to install the solar panel 1.

[0064] The inorganic barrier layer 13 contains silicon nitride. This makes it easy to thin the inorganic barrier layer 13.

[0065] The second sealing film 14 contains a silicone polymer. The silicone polymer is highly flexible, which suppresses damage to the inorganic barrier layer 13 caused by hailstorms and the like.

[0066] The thickness of the solar cell module 10 is 2 mm or less. This increases the flexibility of the solar cell panel 1 and also reduces its weight.

[0067] The weight of the solar cell module 10 is 2 kg or less per square meter. This makes it easy to install and replace the solar cell module 10.

[0068] The solar cell panel 1 further includes a packing 27 positioned between the metal fastener 25 and the metal plate 20. This suppresses the intrusion of moisture into the interior of the solar cell panel 1. As a result, the deterioration of the solar cell panel 1 can be suppressed.

[0069] The solar cell panel 1 further includes a sealing material 28 that covers the contact area between the metal fastener 25 and the metal plate 20. This suppresses the intrusion of moisture into the interior of the solar cell panel 1. As a result, the deterioration of the solar cell panel 1 can be suppressed.

[0070] The first metal plate 21, which is positioned on the back side of the solar cell module 10, has a support portion 30 that supports the wiring 17 of the solar cell module 10. The support portion 30 protrudes from the first surface S on the back side of the first metal plate 21. This restricts the movement of the wiring 17, thereby suppressing loosening or detachment of the wiring 17 at the connection point with the junction box 16.

[0071] The shape of the support portion 30 is L-shaped, U-shaped, or O-shaped when viewed from a horizontal direction parallel to the first surface S. This allows the wiring 17 to be supported inside the support portion 30.

[0072] The shape of the bottom of the support portion 30 in a cross-section parallel to the first surface is tapered towards the upper vertical side. This makes it difficult for moisture to remain at the bottom of the support portion 30, and shortens the time that the wiring 17 is in contact with moisture. As a result, corrosion of the wiring 17 is suppressed, and deterioration of the solar cell panel 1 can be suppressed.

[0073] The shape of the support portion 30 in a cross-section parallel to the first surface S is curved on the upper side. This makes it less likely for the wiring 17 that comes into contact with the bottom of the support portion 30 to be damaged. As a result, deterioration of the wiring is suppressed, and deterioration of the solar cell panel 1 can be suppressed.

[0074] According to at least one embodiment described above, the first sealing film 12 has a metal layer, a metal plate 20, and a metal fastener 25, all of which are composed of the same main metal, either a pure metal or an alloy. This makes it possible to suppress the degradation of the solar cell panel 1.

[0075] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents.

[0076] S...First surface, 1...Solar panel, 10...Solar module, 11...Photoelectric conversion layer, 12...First sealing film (metal layer), 13...Inorganic barrier layer, 14...Second sealing film, 17...Wiring, 20...Metal plate, 25...Metal fastener (rivet), 27...Packing, 28...Sealing material, 30...Support part.

Claims

1. A solar panel comprising: solar cell modules arranged in alignment along a first surface; a photoelectric conversion layer contained in each of the solar cell modules; a first sealing film having a metal layer, disposed on the back side of the photoelectric conversion layer when the light incident side of the first surface is considered the front side and the opposite side of the first surface is considered the back side; metal plates disposed on the front and back sides of adjacent solar cell modules and covering the peripheral edges of the adjacent solar cell modules; and metal fasteners disposed between adjacent solar cell modules and fixing the metal plates in a state where the adjacent solar cell modules are sandwiched between the metal plates, wherein the metal layer, the metal plates, and the metal fasteners are composed of pure metals or alloys having the same main metal component.

2. The solar cell panel according to claim 1, further comprising: an inorganic barrier layer disposed on the front side of the photoelectric conversion layer; and a second sealing film disposed on the front side of the inorganic barrier layer.

3. The solar cell panel according to claim 1, wherein the spontaneous potential difference of the materials constituting the metal layer, the metal plate, and the metal fastener in a 1 M sodium chloride aqueous solution at 25°C is 100 mV or less.

4. The solar cell panel according to claim 1 or 3, wherein the metal layer, the metal plate, and the metal fastener are made of aluminum or an aluminum alloy.

5. The photoelectric conversion layer comprises a halogen element, as described in claim 1 or 2.

6. The solar cell panel according to claim 2, wherein the inorganic barrier layer is a glass layer with a thickness of 250 μm or less.

7. The solar panel according to claim 1 or 2, wherein the metal fastener is a rivet.

8. The solar cell panel according to claim 7, wherein the head of the rivet is flat.

9. The solar cell panel according to claim 2, wherein the inorganic barrier layer comprises silicon nitride.

10. The solar cell panel according to claim 2, wherein the second sealing film comprises a silicone polymer.

11. The solar cell panel according to claim 1 or 2, wherein the thickness of the solar cell module is 2 mm or less.

12. The solar cell module has a weight of 2 kg or less per square meter, as described in claim 1 or 2.

13. The solar cell panel according to claim 1 or 2, further comprising a packing disposed between the metal fastener and the metal plate.

14. The solar cell panel according to claim 1 or 2, further comprising a sealing material that covers the contact portion between the metal fastener and the metal plate.

15. The solar cell panel according to claim 1 or 2, wherein the first metal plate among the metal plates, which is arranged on the back side of the solar cell module, has a support portion for supporting the wiring of the solar cell module, and the support portion protrudes from the first surface on the back side of the first metal plate to the back side.

16. The shape of the support portion is L-shaped, U-shaped, or O-shaped when viewed from a horizontal direction parallel to the first surface, as described in claim 15.

17. The shape of the support portion in a cross-section parallel to the first surface is tapered towards the upper side in the vertical direction, as described in claim 15.

18. The shape of the support portion in a cross-section parallel to the first surface is curved on the upper side, as described in claim 17.

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