Solar cell module

Abstract

To provide a solar cell module with improved design.SOLUTION: A solar cell module 1 includes: at least one solar cell 2; and a printed matter 5 disposed on a light receiving surface 2a side of the solar cell 2 and having a first pattern printed layer 10. The first pattern printed layer 10 includes a first binder 11 and first interference pigments 12 dispersed inside the first binder 11. The first interference pigments 12 each have a particle size range of 5-60 μm. In the solar cell module 1, the content of the first interference pigments 12 is within the range of 0.05-20 parts by weight when the content of the first binder 11 is 100 parts by weight.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a solar cell module. [Background technology]

[0002] With the aim of achieving carbon neutrality and a decarbonized society by 2050, there is a need for the widespread adoption of ZEBs (Net Zero Energy Buildings), which can significantly reduce energy consumption in buildings. A ZEB is a building that aims to achieve a zero annual balance of primary energy consumption while realizing a comfortable indoor environment. Since people are active inside a building, it is impossible to completely reduce energy consumption to zero. However, by reducing energy consumption through energy conservation and generating the equivalent energy through energy generation, it is possible to achieve net energy consumption of zero.

[0003] Energy generation methods that do not use fossil fuels include, for example, solar power generation, wind power generation, and biomass power generation. As a method of energy generation in buildings, solar power generation is suitable when considering installation location and costs. The rooftop of a building is occupied by outdoor units for air conditioning and other equipment, so in order to generate electricity, solar cell modules must be installed on the walls other than the rooftop. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-027266 Summary of the Invention [Problem to be solved by the invention]

[0005] When a solar cell module is installed on a wall, conventional solar cell modules do not have sufficient design features, and improvements are desired.

[0006] An object of the present invention is to provide a solar cell module with improved design. [Means for solving the problem]

[0007] [1] In one aspect, the present invention relates to a solar cell module comprising at least one solar cell and a printed matter having a first picture printed layer disposed on the light-receiving surface side of the solar cell. The first picture printed layer includes a first binder and a first interference pigment dispersed within the first binder. The first interference pigment has a particle size range of 5 μm to 60 μm. The content of the first interference pigment is in the range of 0.05 parts by weight to 20 parts by weight, based on 100 parts by weight of the first binder.

[0008] According to the inventors' investigations, depending on the particle size of the interference pigment used in the printed matter, the resolution of the design (picture) may decrease, the gradation expression of the picture may deteriorate, and the design may be compromised. However, in the printed matter of this solar cell module, the first interference pigment contained in the first picture-printed layer is configured to have a particle size range of 60 μm or less. This prevents a decrease in the resolution of the picture in the first picture-printed layer. Furthermore, in the printed matter of this solar cell module, the content of the first interference pigment is 20 parts by weight or less, which prevents a decrease in the coating performance of the first picture-printed layer. Therefore, this solar cell module prevents a decrease in the resolution of the picture in the first picture-printed layer while also preventing a decrease in the coating performance of the first picture-printed layer, thereby improving the design of the solar cell module. Furthermore, in this solar cell module, the content of the first interference pigment is 20 parts by weight or less. This also prevents a decrease in the transparency of the picture-printed layer. Therefore, this solar cell module effectively prevents a decrease in the light transmitted through the solar cell, thereby maintaining power generation efficiency.

[0009] [2] In the solar cell module of [1] above, the first interference pigment may be an interference pigment containing titanium dioxide-coated mica. In this case, the wavelength of the interference light can be adjusted by adjusting the film thickness and transmittance of the titanium dioxide film. Furthermore, the luminance can be improved by increasing the smoothness of the mica surface. As a result, the design can be further improved.

[0010] [3] In the solar cell module of [1] or [2] above, the content of the first interference pigment may be in the range of 0.05 parts by weight to 10 parts by weight, relative to 100 parts by weight of the first binder. When the content of the first interference pigment is 10 parts by weight or less, deterioration of the coating film performance of the first picture-printed layer can be further suppressed.

[0011] [4] The solar cell module of any one of [1] to [3] above may further include a light-transmitting substrate provided on one side of the printed matter. In this case, the printed matter and the picture print layer can be protected without reducing the light transmitted to the solar cell.

[0012] [5] In any of the solar cell modules [1] to [4] above, the first picture-printed layer may further contain a colorant dispersed within the first binder, and the content of the colorant may be within a range of 0.01 to 1 part by weight, based on 100 parts by weight of the first binder. When the first picture-printed layer contains a colorant, the color gamut of the pattern in the first picture-printed layer can be changed to a desired color gamut, thereby further improving the design. Furthermore, by keeping the content of the colorant within a range of 1 part by weight or less, a decrease in the transparency of the first picture-printed layer can be suppressed, thereby reducing the impact on power generation efficiency.

[0013] [6] In the solar cell module of any one of [1] to [5] above, the printed matter may further include a colored layer that is provided on one side of the first picture-printed layer, does not contain an interference pigment, and is visible light transmissive. In this case, the color gamut of the picture in the first picture-printed layer can be changed to a desired color gamut, thereby improving the design.

[0014] [7] In the solar cell module of any one of [1] to [6] above, the printed matter may further include at least one second pattern-printed layer disposed on the first pattern-printed layer. The second pattern-printed layer includes a second binder and a second interference pigment dispersed within the second binder. The particle size range of the second interference pigment may include a particle size range of 5 μm to 60 μm, and the content of the second interference pigment may be within a range of 0.05 to 20 parts by weight, based on 100 parts by weight of the second binder. In this case, by combining the patterns of the first pattern-printed layer and the second pattern-printed layer, a variety of patterns can be expressed, further improving the design. Furthermore, when the second interference pigment includes a particle size range of 60 μm or less, a decrease in the resolution of the pattern in the second pattern-printed layer can be suppressed. Furthermore, when the content of the second interference pigment is 20 parts by weight or less, a decrease in the coating film performance of the second pattern-printed layer can be suppressed.

[0015] [8] In any of the solar cell modules [1] to [8] above, the total light transmittance may be within a range of 30% to 90%. A total light transmittance of 30% or more can maintain power generation efficiency. On the other hand, a total light transmittance of 90% or less can prevent the pattern of the first pattern-printed layer from appearing too dark. [Effects of the Invention]

[0016] According to the present invention, a solar cell module with improved design is provided. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view schematically showing a solar cell module according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view schematically showing a printed matter provided on the solar cell module shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view schematically showing a first modified example of a printed matter. [Figure 4] FIG. 4 is a cross-sectional view schematically showing a second modified example of the printed matter. [Figure 5]FIG. 5 is a cross-sectional view schematically showing a third modified example of the printed matter. [Figure 6] FIG. 6 is a cross-sectional view schematically showing a solar cell module according to the second embodiment. [Figure 7] 7(a) to 7(c) are cross-sectional views schematically showing a solar cell module according to a third embodiment. [Figure 8] 8(a) and 8(b) are cross-sectional views schematically showing a solar cell module according to a fourth embodiment. [Figure 9] 9(a) and 9(b) are cross-sectional views schematically showing a solar cell module according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] Specific examples of solar cell modules according to embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In the following description, identical elements in the drawings will be designated by the same reference numerals, and duplicated descriptions will be omitted.

[0019] [First embodiment] Fig. 1 is a cross-sectional view schematically showing a solar cell module according to a first embodiment. As shown in Fig. 1, the solar cell module 1 includes thin solar cells 2, an encapsulant layer 3 that encapsulates the solar cells 2, an adhesive layer 4, a printed material 5, and a light-transmitting substrate 6. The solar cell module 1 may further include a backing material (not shown) below the encapsulant layer 3. The backing material is a member made of polyethylene terephthalate (PET), polycarbonate resin, acrylic resin, glass, or metal (such as aluminum) formed into a layer, film, or plate shape. The encapsulant layer 3 may be formed on such a backing material.

[0020] The solar cell 2 is a photoelectric conversion element formed in a thin plate shape with a thickness of about 0.2 mm and made of crystalline or amorphous silicon, thin-film silicon, perovskite, chalcopyrite, III-V, CdTe, CIS, or the like, that generates electricity by absorbing light with wavelengths mainly in the visible light range. The solar cell 2 is embedded (sealed) in the encapsulant layer 3 so that the light-receiving surface 2a faces the printed matter 5. The light-receiving surface 2a of the solar cell 2 is black or dark blue. Although the example shown in FIG. 1 shows three solar cell cells 2, the solar cell module 1 may include a large number of solar cell cells 2.

[0021] The encapsulant layer 3 is a layer formed from a transparent encapsulant material such as ethylene vinyl acetate (EVA), polyvinyl butyral (PVB), polyolefin resin, ionomer resin, silicone resin, etc. The encapsulant layer 3 is formed by surrounding and encapsulating the solar cell 2 with the transparent encapsulant material. The thickness of the encapsulant layer 3 is, for example, about 1 mm.

[0022] A transparent surface plate for protecting the solar cell 2 and the like may be provided on the encapsulant layer 3. Such a surface plate may be made of a transparent material such as polycarbonate resin, acrylic resin, or glass, and has a thickness of, for example, about 3 mm.

[0023] The printed matter 5 is a member for imparting design to the solar cell module 1. The printed matter 5 is attached to the front surface side of the encapsulant layer 3 by a transparent adhesive layer 4 or the like. Details of the printed matter 5 will be described later.

[0024] The light-transmitting substrate 6 is a substrate that is transparent to visible light. The light-transmitting substrate 6 is made of, for example, a transparent resin. Examples of transparent resins include PET, PMMA, polyethylene, polypropylene, nylon, PEN, and polycarbonate. The thickness of the light-transmitting substrate 6 is, for example, 25 μm to 250 μm. In the case of a glass substrate, the thickness of the light-transmitting substrate 6 is, for example, several mm to 10 mm. If necessary, a surface protection layer may be provided on the surface side of the light-transmitting substrate 6 (the side opposite to the printed matter 5).

[0025] As shown in FIG. 2, the printed matter 5 is composed of a first pattern-printed layer 10. The first pattern-printed layer 10 is a layer that represents the pattern of the printed matter 5 and is composed of multiple color dots. The first pattern-printed layer 10 can be formed on one surface 6a of the translucent substrate 6 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. The first pattern-printed layer 10 contains a first binder 11 and chip-like first interference pigments 12 dispersed within the first binder 11. Here, the term "dot" refers to a point that constitutes an element of the printed image, and its shape is not limited to a circle and may be rectangular, polygonal, or other shapes. Each of the multiple color dots contains the first binder 11 and multiple first interference pigments 12 dispersed within the first binder 11. The content of the first interference pigments 12 is, for example, in the range of 0.05 to 20 parts by weight, assuming that the first binder 11 is 100 parts by weight. The content of the first interference pigment 12 is preferably within the range of 0.05 to 10 parts by weight.

[0026] Examples of the first binder 11 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, polycarbonates, and ethylene vinyl acetate (EVA) resins. The thickness of the first picture-printed layer 10 is, for example, 1 μm to 10 μm. The first picture-printed layer 10 may contain a curing agent. In this case, the heat resistance of the first picture-printed layer 10 and the adhesion of the first picture-printed layer 10 to the light-transmitting substrate 6 can be improved.

[0027] The first interference pigment 12 is composed of flakes (not shown) that are transparent to visible light and a metal oxide film (not shown) that covers the flakes. Light incident on the first picture-printed layer 10 from the translucent substrate 6 side is reflected by the surface of the metal oxide film, and light that passes through the metal oxide film and is reflected by the surface of the flakes interferes with each other, generating interference light. Adjusting the thickness and refractive index of the metal oxide film allows the generation of interference light with a desired wavelength.

[0028] The first interference pigment 12 is, for example, titanium dioxide-coated mica. The flakes constituting the first interference pigment 12 may be made of a material other than mica, such as silica, alumina, glass, or polysilicate. The metal oxide film constituting the first interference pigment 12 may be made of a material other than titanium dioxide, such as zirconium oxide, zinc oxide, iron oxide, or tin oxide.

[0029] The first interference pigment 12 has a particle size range of 5 μm to 60 μm. When the particle size of the first interference pigment 12 is 5 μm or more, the pattern in the first picture-printed layer 10 can be improved. When the particle size of the first interference pigment 12 is 60 μm or less, a decrease in the resolution of the pattern in the first picture-printed layer 10 can be suppressed. The particle size range of the first interference pigment 12 may be 5 μm to 40 μm, or may be 5 μm to 25 μm. In this case, a decrease in the resolution of the pattern in the first picture-printed layer 10 can be further suppressed. Here, "particle size" refers to the longest diameter of the particle cross section.

[0030] When incident light L enters the first picture-printed layer 10, the first interference pigment 12 generates a first interference light 13. The first interference pigment 12 may be, for example, a white interference pigment (white pearl pigment). In this case, the first interference light 13 exhibits a white color. The first interference pigment 12 may also be an interference pigment of another color, for example, a red interference pigment, a green interference pigment, or a blue interference pigment.

[0031] The total light transmittance of the printed matter 5 (and the solar cell module 1) is, for example, 30% to 90%. The total light transmittance here refers to a value measured using a spectrophotometer (for example, the UV-2100 spectrophotometer manufactured by Shimadzu Corporation). The light here refers to light in the wavelength range of 380 nm to 780 nm.

[0032] [First variant of printed matter] Here, a first modified example of a printed matter used in a solar cell module 1 will be described with reference to FIG. 3. FIG. 3 is a cross-sectional view schematically illustrating the first modified example of the printed matter. As shown in FIG. 3, the first picture-printed layer 10A of the printed matter 5A includes a first binder 11, a first interference pigment 12 dispersed within the first binder 11, and a colorant 14 dispersed within the first binder 11. The content of the colorant 14 is, for example, within a range of 0.01 to 1 part by weight, assuming that the first binder 11 is 100 parts by weight. Examples of the colorant 14 include known organic pigments, inorganic pigments, and dyes. Examples of organic pigments include soluble and insoluble azo pigments, high-molecular-weight azo pigments, phthalocyanine pigments, quinacridone pigments, anthraquinone pigments, diketopyrrolopyrrole pigments, quinophthalone pigments, methine and azomethine pigments, perylene pigments, perinone pigments, isoindolinone pigments, and isoindoline pigments. Examples of inorganic pigments include red iron oxide, vermilion red, cadmium red, titanium yellow, yellow lead, iron yellow, ultramarine, Prussian blue, cobalt blue, verdigris, iron black, carbon black, titanium white, zinc white, antimony white, etc. Examples of dyes include natural dyes, oil-soluble dyes, acid dyes, basic dyes, etc.

[0033] [Second variant of printed matter] Next, a second modified example of the printed matter used in the solar cell module 1 will be described with reference to Fig. 4. Fig. 4 is a cross-sectional view schematically showing the second modified example of the printed matter. As shown in Fig. 4, the printed matter 5B further has a colored layer 20 provided on the first picture-printed layer 10 in addition to the first picture-printed layer 10.

[0034] The colored layer 20 is formed on the first picture-printed layer 10 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. The colored layer 20 includes a binder 21 and a colorant 22 dispersed within the binder 21. The content of the colorant 22 is, for example, in the range of 0.01 to 1 part by weight, based on 100 parts by weight of the binder 21. Examples of the binder 21 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, and polycarbonate resins. Examples of the colorant 22 include known organic pigments, inorganic pigments, and dyes. Examples of organic pigments include soluble and insoluble azo pigments, high-molecular-weight azo pigments, phthalocyanine pigments, quinacridone pigments, anthraquinone pigments, diketopyrrolopyrrole pigments, quinophthalone pigments, methine and azomethine pigments, perylene pigments, perinone pigments, isoindolinone pigments, and isoindoline pigments. Examples of inorganic pigments include red iron oxide, vermilion red, cadmium red, titanium yellow, yellow lead, iron yellow, ultramarine, Prussian blue, cobalt blue, verdigris, iron black, carbon black, titanium white, zinc white, and antimony white. Examples of dyes include natural dyes, oil-soluble dyes, acid dyes, and basic dyes. The colored layer 20 does not contain an interference pigment. By using such materials, the colored layer 20 is transparent to visible light. The thickness of the colored layer 20 is, for example, 1 μm to 10 μm.

[0035] [Third variant of printed matter] Next, a third modified example of the printed matter used in the solar cell module 1 will be described with reference to Fig. 5. Fig. 5 is a cross-sectional view schematically showing the third modified example of the printed matter. As shown in Fig. 5, the printed matter 5C further has, in addition to the first picture-printed layer 10, a second picture-printed layer 30 provided on the first picture-printed layer 10.

[0036] The second pattern-printed layer 30 is a layer that, together with the first pattern-printed layer 10, expresses the pattern of the printed matter 5C. The second pattern-printed layer 30 is formed on the first pattern-printed layer 10 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. The second pattern-printed layer 30 contains a second binder 31 and a second interference pigment 32 dispersed within the second binder 31. Similar to the first pattern-printed layer 10, the second pattern-printed layer 30 is dot-shaped. The content of the second interference pigment 32 is, for example, in the range of 0.05 parts by weight to 20 parts by weight, where the content of the second binder 31 is 100 parts by weight. The content of the second interference pigment 32 may be in the range of 0.05 parts by weight to 10 parts by weight.

[0037] Examples of the second binder 31 include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, and polycarbonate resins. The thickness of the second picture-printed layer 30 is, for example, 1 μm to 10 μm. The second picture-printed layer 30 may contain a curing agent. In this case, the heat resistance of the second picture-printed layer 30 and the adhesion of the second picture-printed layer 30 to the first picture-printed layer 10 can be improved.

[0038] In this third modified example, the second interference pigment 32 is composed of flakes (not shown) that are transparent to visible light and a metal oxide film (not shown) that covers the flakes. Light incident on the second picture-printed layer 30 from the translucent substrate 6 side is reflected on the surface of the metal oxide film, and light that passes through the metal oxide film and is reflected on the surface of the flakes interferes with each other, generating interference light. Adjusting the thickness and refractive index of the metal oxide film allows the generation of interference light with a desired wavelength.

[0039] In a third variation, the second interference pigment 32 is, for example, titanium dioxide-coated mica. The flakes constituting the second interference pigment 32 may be made of a material other than mica, such as silica, alumina, glass, or polysilicate. The metal oxide film constituting the second interference pigment 32 may be made of a material other than titanium dioxide, such as zirconium oxide, zinc oxide, iron oxide, or tin oxide.

[0040] The second interference pigment 32 has a particle size range of 5 μm to 60 μm. When the particle size of the second interference pigment 32 is 5 μm or more, the pattern in the second picture-printed layer 30 can be improved. When the particle size of the second interference pigment 32 is 60 μm or less, a decrease in the resolution of the pattern in the second picture-printed layer 30 can be suppressed. The particle size range of the second interference pigment 32 may be 5 μm to 40 μm, or may be 5 μm to 25 μm. In this case, a decrease in the resolution of the pattern in the second picture-printed layer 30 can be further suppressed. Here, "particle size" refers to the longest diameter of the particle cross section.

[0041] When incident light L enters the second picture-printed layer 30, second interference light 33 is generated from the second interference pigment 32. The second interference pigment 32 may be, for example, a red interference pigment (red pearl pigment). In this case, the second interference light 33 exhibits red color.

[0042] As described above, in the solar cell module 1 according to this embodiment, the first interference pigment 12 contained in the first picture-printed layer 10 is configured to have a particle size range of 60 μm or less. This prevents a decrease in the resolution of the pattern in the first picture-printed layer 10. Furthermore, in the printed matters 5, 5A-5C of this solar cell module 1, the content of the first interference pigment 12 is 20 parts by weight or less, which prevents a decrease in the coating performance of the first picture-printed layer 10. Therefore, this solar cell module 1 prevents a decrease in the resolution of the pattern in the first picture-printed layer 10 while also preventing a decrease in the coating performance of the first picture-printed layer 10, thereby improving the design of the solar cell module 1. Furthermore, in the solar cell module 1, the content of the first interference pigment 12 is 20 parts by weight or less. This also prevents a decrease in the transmittance of the first picture-printed layer 10. Therefore, the solar cell module 1 effectively prevents a decrease in the light transmitted through the solar cell 2, thereby maintaining power generation efficiency.

[0043] In the solar cell module 1 according to this embodiment, the first interference pigment 12 is an interference pigment containing titanium dioxide-coated mica. In this case, the wavelength of the interference light can be adjusted by adjusting the film thickness and transmittance of the titanium dioxide film. Furthermore, the perceived brightness can be improved by increasing the smoothness of the mica surface. As a result, the design can be further improved.

[0044] In the solar cell module 1 according to this embodiment, the content of the first interference pigment 12 may be in the range of 0.05 parts by weight to 10 parts by weight, based on 100 parts by weight of the first binder 11. When the content of the first interference pigment 12 is 10 parts by weight or less, the deterioration of the coating performance of the first picture-printed layer 10 can be further suppressed.

[0045] The solar cell module 1 according to this embodiment may further include a light-transmitting base material 6 provided on one of the printed matters 5, 5A to 5C. In this case, the printed matters 5, 5A to 5C and the first picture printed layer 10 can be protected without reducing the light transmitted to the solar cell 2.

[0046] In the solar cell module 1 according to this embodiment, the first picture-printed layer 10A further contains a coloring material 14 dispersed within the first binder 11. The content of the coloring material 14 may be within a range of 0.01 to 1 part by weight, where the first binder 11 is taken as 100 parts by weight. When the first picture-printed layer 10A contains the coloring material 14 (first modification), the color gamut of the pattern in the first picture-printed layer 10A can be changed to a desired color gamut, thereby further improving the design. Furthermore, by keeping the coloring material content within a range of 1 part by weight or less, a decrease in the transparency of the first picture-printed layer 10A can be suppressed, thereby reducing the impact on power generation efficiency.

[0047] In the solar cell module 1 according to this embodiment, the printed matter 5B may further include a colored layer 20 that is provided on one side of the first picture-printed layer 10, does not contain an interference pigment, and is visible light transmissive. In this case (second modified example), the color gamut of the pattern in the first picture-printed layer 10 can be changed to a desired color gamut, thereby improving the design.

[0048] In the solar cell module 1 according to this embodiment, the printed matter 5C may further include at least one second pattern-printed layer 30 disposed on the first pattern-printed layer 10. The second pattern-printed layer 30 includes a second binder 31 and a second interference pigment 32 dispersed within the second binder 31. The particle size range of the second interference pigment 32 may be between 5 μm and 60 μm, and the content of the second interference pigment 32 may be between 0.05 and 20 parts by weight, based on 100 parts by weight of the second binder 31. In this case (third modification), by combining the pattern of the first pattern-printed layer 10 with the pattern of the second pattern-printed layer 30, a variety of patterns can be expressed, further improving the design. Furthermore, when the second interference pigment 32 includes a particle size range of 60 μm or less, a decrease in the resolution of the pattern in the second pattern-printed layer 30 can be suppressed. Furthermore, when the content of the second interference pigment 32 is 20 parts by weight or less, the coating performance of the second picture-printed layer 30 can be prevented from decreasing.

[0049] In the solar cell module 1 according to this embodiment, the total light transmittance may be in the range of 30% to 90%. When the total light transmittance is 30% or more, power generation efficiency can be maintained. On the other hand, when the total light transmittance is 90% or less, the pattern of the first pattern printed layer 10 and the like can be prevented from appearing too dark.

[0050] [Second embodiment] Next, a solar cell module according to a second embodiment will be described with reference to Fig. 6. As shown in Fig. 6, a solar cell module 1A according to the second embodiment includes thin-plate solar cells 2, a sealant layer 3 that seals the solar cells 2, an adhesive layer 4, a printed matter 5, a translucent base material 6, and a top coat layer 7. The solar cells 2, the sealant layer 3, the adhesive layer 4, the printed matter 5, and the translucent base material 6 have the same configurations as those in the first embodiment. In the solar cell module 1A, the printed matter 5 may be any of printed matters 5A to 5C.

[0051] The top coat layer 7 is a coating layer for protecting the printed matter 5 and the translucent substrate 6, protecting the surface of the solar cell module 1A. The top coat layer 7 is a transparent sheet-like layer formed by coating with a hard resin and can impart weather resistance, contamination resistance, and scratch resistance to the solar cell module 1A. For example, an acrylic urethane resin obtained by adding an isocyanate to an acrylic polyol and curing the resin can be used as the main resin. The top coat layer 7 can be prepared by adding an ultraviolet absorber and a hindered amine light stabilizer to an acrylic polyol as the main resin and hexamethylene diisocyanate as the curing agent. A benzotriazole ultraviolet absorber is typically used as the ultraviolet absorber. The top coat layer 7 is not limited to the above-mentioned materials and may be formed from various active energy ray-curable coating compositions or thermosetting coating compositions that are cured by ultraviolet irradiation or electron beams.

[0052] The thickness of the top coat layer 7 may be, for example, 5 to 50 μm, preferably 10 to 40 μm, and more preferably 15 to 30 μm.

[0053] According to this solar cell module 1A, in addition to the same effects as those of the first embodiment, the top coat layer 7 can reliably protect the printed matter 5 and the like.

[0054] [Third embodiment] Next, a solar cell module according to a third embodiment will be described with reference to FIG. 7. As shown in FIG. 7(a), a solar cell module 1B according to the third embodiment includes thin solar cells 2, a sealant layer 3 that seals the solar cells 2, a printed matter 5, a translucent base material 6, and a second sealant layer 8. The solar cells 2, the sealant layer 3, the printed matter 5, and the translucent base material 6 have the same configurations as those in the first embodiment. The second sealant layer 8 is disposed, for example, between the sealant layer 3 and the printed matter 5. In this solar cell module 1B, the second sealant layer 8 is provided instead of the adhesive layer 4. The second sealant layer 8 can be formed from a material similar to that of the sealant layer 3. Note that in the solar cell modules 1B (1C and 1D described below), the printed matter 5 can be any of the printed matters 5A to 5C.

[0055] In this solar cell module 1B, glass is used as the light-transmitting base material 6, and the printed matter 5 can be formed by printing on this glass-made light-transmitting base material 6. This printed matter 5 is then sealed with a second sealing material layer 8. This is attached to the sealing material layer 3 that seals the solar cells 2, thereby producing the solar cell module 1B. When the light-transmitting base material 6 is made of glass, it becomes easy to use the light-transmitting base material 6 as the outermost layer.

[0056] In the third embodiment, as in a modified solar cell module 1C shown in Fig. 7(b), the printed matter 5 may be printed on the second encapsulant layer 8. In this case, the layer configuration is the same as that of the solar cell module 1B. Alternatively, as in a modified solar cell module 1D shown in Fig. 7(c), the printed matter 5 may be printed on the second encapsulant layer 8, and the printed matter 5 may face the encapsulant layer 3 that encapsulates the solar cells 2.

[0057] In addition to the same advantageous effects as those of the first embodiment, these solar cell modules 1B, 1C, and 1D can reduce the thickness of the solar cell module by printing the printed matter 5. Also, displacement of the printed matter 5 can be prevented.

[0058] [Fourth embodiment] Next, a solar cell module according to a fourth embodiment will be described with reference to Fig. 8. As shown in Fig. 8(a), a solar cell module 1E according to the fourth embodiment includes thin solar cells 2, a sealant layer 3 that seals the solar cells 2, a printed matter 5, light-transmitting base materials 6A and 6B, and second sealant layers 8A and 8B. The solar cells 2, the sealant layer 3, and the printed matter 5 have the same configurations as those in the first embodiment. The light-transmitting base materials 6A and 6B correspond to the light-transmitting base material 6 in the first embodiment, and the second sealant layers 8A and 8B correspond to the second sealant layer 8 in the third embodiment. In the solar cell module 1E, the light-transmitting base material and the second sealant layer are formed as a pair. Note that in the solar cell module 1E (1F, described later), any of the printed matters 5A to 5C may be used as the printed matter 5.

[0059] In this solar cell module 1E, the outermost light-transmitting base material 6B is made of glass, and the inner light-transmitting base material 6A is made of a resin film. The printed matter 5 is printed on, for example, the inner light-transmitting base material 6A. The light-transmitting base material 6A on which the printed matter 5 is printed is then sandwiched and sealed between a pair of second sealing material layers 8A, 8B. This forms the solar cell module 1E shown in FIG. 8(a). Note that in the solar cell module 1F shown in FIG. 8(b), the vertical direction of the printed matter 5 printed on the light-transmitting base material 6A made of a resin film is changed so that the printed matter 5 is in contact with the second sealing material layer 8B.

[0060] In addition to the same advantageous effects as any of the above-described embodiments, these solar cell modules 1E and 1F can use a resin film on which the printed matter 5 is pre-printed, thereby improving manufacturing efficiency.

[0061] [Fifth embodiment] Next, a solar cell module according to a fifth embodiment will be described with reference to Fig. 9. As shown in Fig. 9(a), a solar cell module 1G according to the fifth embodiment includes thin solar cells 2, a sealant layer 3 that seals the solar cells 2, a printed matter 5, light-transmitting base materials 6A and 6B, and second sealant layers 8A and 8B. The solar cell module 1G has a layer structure substantially similar to that of the solar cell module 1E according to the fourth embodiment (see Fig. 8(a)). However, in the solar cell module 1G, both the light-transmitting base materials 6A and 6B are formed from a resin film. Note that a solar cell module 1H shown in Fig. 9(b) also has a layer structure substantially similar to that of the solar cell module 1F according to the fourth embodiment (see Fig. 8(b)), but differs in that both the light-transmitting base materials 6A and 6B are formed from a resin film.

[0062] These solar cell modules 1G and 1H can reduce the weight of the entire solar cell module in addition to providing the same effects as those of the fourth embodiment. To further enhance the durability of these solar cell modules, a highly weather-resistant substrate such as a fluorine-based film or an acrylic film may be used for the outermost translucent substrate 6B.

[0063] Although the solar cell modules 1, 1A to 1H according to the present invention have been described above, the solar cell modules according to the present invention are not limited to the above-described embodiments, and various other modifications are possible.

[0064] For example, in the solar cell modules 1, 1A to 1H, a transparent smoke-printed layer may be further provided between the encapsulant layer 3 that encapsulates the solar cells 2 and the printed matter 5. The transparent smoke-printed layer attenuates light transmitted through the printed matter 5 to an extent that does not affect solar power generation. The transparent smoke-printed layer can be provided on the printed matter 5 by, for example, screen printing, inkjet printing, gravure printing, or offset printing using an ink in which a small amount of carbon black is dispersed in a resin binder such as a vinyl, acrylic, urethane, or polyester binder. The thickness of the transparent smoke-printed layer is, for example, 1 μm to 10 μm. The transparent smoke-printed layer enhances the color development of the printed matter 5 and further improves the design. Furthermore, because the transparent smoke-printed layer is transparent, a decrease in light transmitted through the solar cells 2 is effectively suppressed.

[0065] Furthermore, in the solar cell modules 1, 1A to 1H, a white pattern layer may be further provided between the encapsulant layer 3 that encapsulates the solar cell 2 and the printed matter 5. The white pattern layer can be provided on the printed matter 5 by, for example, screen printing, inkjet printing, gravure printing, or offset printing. The white pattern layer can be composed of a plurality of silver dots. Each of the plurality of silver dots contains a silver binder and a plurality of silver pigment chips dispersed within the silver binder. The content of the plurality of silver pigment chips is, for example, in the range of 0.5 parts by weight to 20 parts by weight, where the silver binder is 100 parts by weight.

[0066] Examples of binders for silver include vinyl resins, acrylic resins, thermoplastic urethane resins, polyester resins, and polycarbonate resins. The thickness of the white pattern layer is, for example, 1 μm to 10 μm. The white pattern layer may contain a curing agent. In this case, the heat resistance of the white pattern layer and the adhesion of the white pattern layer to the printed matter 5 can be improved. This allows the printed matter 5 to have excellent color development and a pattern that gives a whitish impression. [Explanation of symbols]

[0067] 1, 1A to 1H... solar cell module, 2... solar cell cell, 2a... light-receiving surface, 3... encapsulant layer, 4... adhesive layer, 5, 5A to 5C... printed matter, 6, 6A, 6B... light-transmitting substrate, 7... top coat layer, 8, 8A, 8B... second encapsulant layer, 10... first pattern printed layer, 11... first binder, 12... first interference pigment, 14... colorant, 20... color layer, 30... second pattern printed layer, 31... second binder, 32... second interference pigment.

Claims

1. at least one solar cell; A solar cell module including: a printed matter having a first picture print layer, the printed matter being arranged on the light receiving surface side of the solar cell; the first picture-printed layer includes a first binder and a first interference pigment dispersed in the first binder; the first interference pigment comprises a particle size range of 5 μm to 60 μm; A solar cell module, wherein the content of the first interference pigment is in the range of 0.05 parts by weight to 20 parts by weight, relative to 100 parts by weight of the first binder.

2. The first interference pigment is an interference pigment comprising titanium dioxide-coated mica. The solar cell module according to claim 1 .

3. the content of the first interference pigment is in the range of 0.05 parts by weight to 10 parts by weight, where the content of the first binder is 100 parts by weight; The solar cell module according to claim 1 or 2.

4. Further provided with a light-transmitting substrate provided on one side of the printed matter, The solar cell module according to claim 1 or 2.

5. The first picture-printed layer further includes a colorant dispersed within the first binder, The content of the coloring material is in the range of 0.01 parts by weight to 1 part by weight, where the content of the first binder is 100 parts by weight. The solar cell module according to claim 1 or 2.

6. The printed matter is The optical disc further includes a colored layer that is provided on one side of the first picture-printed layer, does not contain an interference pigment, and has visible light transmittance. The solar cell module according to claim 1 or 2.

7. The printed matter is The sheet further includes at least one second picture print layer provided on the first picture print layer, the second picture-printed layer includes a second binder and a second interference pigment dispersed in the second binder; the particle size range of the second interference pigment comprises a particle size range of 5 μm to 60 μm; the content of the second interference pigment is in the range of 0.05 parts by weight to 20 parts by weight, based on 100 parts by weight of the second binder; The solar cell module according to claim 1 or 2.

8. The total light transmittance is in the range of 30% to 90%. The solar cell module according to claim 1 or 2.

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