Solar cell module

Abstract

To provide a solar cell module in which reflection on a rear surface side substrate is less likely to occur when viewed from a rear surface side as compared with conventional solar cell modules.　A solar cell module is configured such that: a solar cell (40) is disposed between a light-receiving-side substrate (12) and a rear-surface-side substrate (82), a colored sealing material (81) is disposed between the solar cell (40) and the back-surface-side substrate (82); and when viewed in a plan view from the back-surface-side substrate (82) side, a see-through region (130) through which the colored sealing material (81) can be seen and a see-through-difficulty region (131) in which a color of the colored sealing material (81) is reflected and which is more difficult to see through than the see-through region (130) are provided in an arrangement region (125) in which the colored sealing material (81) is disposed.

Description

solar cell module

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

[0002] In recent years, solar cell modules have been used not only for roofs but also as a replacement for glass panels on the railings of balconies and verandas of apartment buildings and the like (see, for example, Patent Document 1). For example, the balcony in Patent Document 1 has multiple support posts erected at regular intervals, handrails arranged on the top ends of these support posts, and rectangular solar cell panels (solar cell modules) sandwiched and attached between each support post and the handrail. According to Patent Document 1, the solar cell panels (solar cell modules) can be easily attached and detached by removing the handrails.

[0003] Patent No. 3995395

[0004] Meanwhile, on the lower floors of apartment buildings and the like, in order to ensure privacy, it is necessary to make it difficult for the interior of rooms to be seen from the street side through glass panels on the balcony railings.

[0005] Therefore, the inventors prototyped a solar cell module in which multiple solar cell strings were sealed between two glass substrates, with a colored sealant interposed between the glass substrate on the room side and the solar cell strings, and used this instead of the glass panel of the handrail, following the example of Patent Document 1. As a result, it became possible to generate electricity using sunlight shining in from the road side, while making it difficult for the room to be seen from the road side, resulting in a highly designed handrail that appears the color of the colored sealant whether viewed from the road side or the room side.

[0006] However, the prototype solar cell module had a problem in that the glass substrate on the room side was smooth, which made the glass substrate on the room side a mirror, reflecting the room, and allowing the inside of the room to be seen through the glass substrate on the room side from the room itself or from the adjacent room.

[0007] Therefore, an object of the present invention is to provide a solar cell module in which reflection on the back substrate is less likely to occur than in the past.

[0008] One aspect of the present invention for solving the above-mentioned problems is a solar cell module in which a solar cell is arranged between a light-receiving side substrate and a back side substrate, and a colored sealing material is arranged between the solar cell and the back side substrate, and when viewed in a plane from the back side substrate side, the arrangement area in which the colored sealing material is arranged is provided with a see-through area through which the colored sealing material can be seen, and a difficult-to-see-through area in which the color of the colored sealing material is reflected but which is more difficult to see through than the see-through area.

[0009] The term "colored" as used herein refers to colors other than colorless and transparent, and includes achromatic colors such as white and black.

[0010] According to this aspect, when viewed from the rear surface side substrate side, there is a mixture of a see-through region in which the colored sealant is visible through the rear surface side substrate and the color of the colored sealant is reflected in the appearance, and a difficult-to-see-through region in which the color of the colored sealant is reflected in the appearance but the colored sealant is less visible than in the see-through region and reflections are less likely to occur, so reflections on the rear surface side substrate are less likely to occur than in conventional cases.

[0011] In a preferred aspect, the rear surface of the substrate has a smooth portion and a roughened portion on the rear surface, and the roughened portion is composed of a convex portion that protrudes from the smooth portion or a concave portion that is recessed from the smooth portion, and when viewed in a plane from the rear surface of the substrate, the smooth portion belongs to the see-through region and the roughened portion belongs to the difficult-to-see-through region.

[0012] The term "smooth" as used herein does not only refer to a completely smooth surface, but also includes a surface that has minute irregularities when viewed microscopically with a microscope or the like, but is smooth when viewed macroscopically with the naked eye or the like, and also includes a surface having an arithmetic mean roughness Ra of 60 μm or less. The same applies hereinafter.

[0013] In a preferred aspect, the uneven portion is formed by the recess, and the bottom of the recess has an uneven surface.

[0014] In a preferred aspect, the uneven portion is made up of the convex portion, and the convex portion protrudes in a curved shape.

[0015] In a preferred aspect, the uneven portion is formed by the recess, and the recess is recessed in a curved shape.

[0016] In a preferred aspect, an inner encapsulant is provided between the colored encapsulant and the solar cell, and the colored encapsulant has a smooth surface facing the inner encapsulant.

[0017] In a preferred aspect, the colored sealing material has a surface on the rear surface side substrate side in contact with the rear surface side substrate, and the rear surface side substrate has a smooth surface on the solar cell side.

[0018] In a preferred aspect, the area of ​​the perspective region is 30% to 90% of the entire area of ​​the placement region.

[0019] The above aspects may be made dependent on each other, or some of the configurations may be quoted or substituted for each other, as long as they are included in the technical scope of the present invention.

[0020] According to the solar cell module of the present invention, glare on the back substrate is less likely to occur than in the past.

[0021] FIG. 1 is a perspective view schematically showing a situation in which a solar cell module according to a first embodiment of the present invention is used for a balcony handrail. FIG. 2 is an explanatory diagram of the solar cell module of FIG. 1, where (a) is a perspective view seen from the light-receiving surface side and (b) is a perspective view seen from the back surface side. FIG. 2 is an exploded perspective view of the solar cell module of FIG. 2(b). FIG. 3 is an exploded perspective view of the back surface-side sealing member of FIG. 3. FIG. 2(a) is a longitudinal sectional view of the solar cell module of FIG. 2(a). FIG. 1 is a rear view of the solar cell module of FIG. 1. FIG. 2(b) is a perspective view of a solar cell module according to a second embodiment of the present invention, seen from the back surface side. FIG. 7 is a longitudinal sectional view of the solar cell module of FIG. 7. FIG. 7 is a rear view of the solar cell module of FIG. 7. FIG. 10 is a perspective view of a solar cell module according to a third embodiment of the present invention, seen from the back surface side. FIG. 11 is a longitudinal sectional view of the solar cell module of FIG. 10. FIG. 12 is a rear view of the solar cell module of FIG. 10.

[0022] Hereinafter, embodiments of the present invention will be described in detail.

[0023] As shown in Figure 1, a solar cell module 1 according to a first embodiment of the present invention is suitable for use primarily as a panel for a handrail 201 on a balcony 200 of an apartment building or the like. The solar cell module 1 is attached in an upright position on the balcony 200, with its vertical sides extending in the vertical direction (vertical direction Y) and its horizontal sides extending in the direction of extension of the capping portion 203 of the handrail 201 (horizontal direction X). The solar cell module 1 is a plate-like panel with its outer surface, relative to a room 202, serving as a light-receiving surface 2 and its inner surface (the surface facing the room 202) serving as a back surface 3, and is capable of generating electricity when light such as sunlight enters the light-receiving surface 2.

[0024] 2 and 3 , the solar cell module 1 includes a light-receiving-side sealing member 5, a solar cell string 6, wiring members 7, and a back-side sealing member 8, and the solar cell string 6 and wiring members 7 are sealed by being sandwiched between the light-receiving-side sealing member 5 and the back-side sealing member 8. One of the main features of the solar cell module 1 is that the back-side sealing member 8 constituting the back surface 3 is subjected to a surface treatment that suppresses reflection of the room 202 from the room 202 side.

[0025] <Light-receiving-side sealing member 5> As shown in FIGS. 2 and 3 , the light-receiving-side sealing member 5 covers the light-receiving surface 2 side of the solar cell string 6, and as shown in FIG. 2( a), includes a first light-receiving-side sealing material 10, a second light-receiving-side sealing material 11, a light-receiving-side substrate 12, and a wiring shielding member 13.

[0026] (First light-detector-side sealing material 10) The first light-detector-side sealing material 10 is a translucent insulating sealing material having sealing properties, insulation properties, and light-transmitting properties, and is an adhesive material that bonds the solar cell strings 6 and the wiring members 7 to the second light-detector-side sealing material 11. The first light-detector-side sealing material 10 is elastic and can deform along the solar cell strings 6 and the wiring members 7 as shown in FIG. 5, thereby burying part of the solar cell strings 6 and the wiring members 7. The first light-detector-side sealing material 10 is not particularly limited as long as it has sealing properties, insulation properties, and light-transmitting properties, and for example, a resin sealing material such as a polyolefin elastomer can be used.

[0027] (Second Light-Receiver Side Sealing Material 11) The second light-receiver side sealing material 11 is a translucent insulating sealing material that has sealing properties, insulating properties, and light-transmitting properties, and is an adhesive that bonds between the first light-receiver side sealing material 10 and the light-receiver side substrate 12. The second light-receiver side sealing material 11 is not particularly limited as long as it has sealing properties, insulating properties, and light-transmitting properties, and for example, a resin sealing material such as a polyolefin elastomer can be used.

[0028] (Light-receiving-side substrate 12) The light-receiving-side substrate 12 is a translucent insulating substrate that has sealing, insulating, and light-transmitting properties, and is a member that constitutes the light-receiving surface 2. The light-receiving-side substrate 12 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties, and a glass substrate such as float glass or colored glass can be used, for example. The light-receiving-side substrate 12 of this embodiment is made of float glass that is smooth on both sides.

[0029] (Wiring Shielding Member 13) As shown in Figure 2(a) , the wiring shielding member 13 is a square ring-shaped member that is arranged to surround the solar cell string 6 when viewed from the light-receiving surface 2 side and hides part of the wiring member 7. The wiring shielding member 13 is a colored, non-transparent member that does not substantially have translucency, and is preferably a black, opaque sealing material. Here, "substantially not having translucency" means that the light transmittance in the thickness direction is 3% or less. The same applies hereinafter.

[0030] <Solar Cell String 6> As shown in Fig. 5 , the solar cell string 6 is formed by electrically connecting one or more solar cell cells 40 (solar cells) in series directly or via a conductive adhesive 41. Each solar cell 40 has a negative electrode terminal 42 on one main surface and a positive electrode terminal 43 on the other main surface. When viewed from above, the solar cell 40 is a rectangular small panel having two opposing sides 44, 45. The negative electrode terminal 42 is provided along one side 44 in the vicinity of the side 44, and the positive electrode terminal 43 is provided along the opposite side 45 in the vicinity of the opposite side 45 to the side 44. In the solar cell string 6 of this embodiment, the negative electrode terminals 42 and the positive electrode terminals 43 of adjacent solar cells 40 are connected at overlapping portions (so-called shingled connection).

[0031] The conductive adhesive 41 is a conductive member having conductivity, and is an adhesive that connects the terminal portions 42, 43 of adjacent solar cells 40, 40. The conductive adhesive 41 in this embodiment is a conductive paste.

[0032] <Wiring Member 7> The wiring member 7 is a member that extracts power from each solar cell string 6 to the outside. As shown in Fig. 3 , the wiring member 7 includes extraction wiring portions 50a to 50c that can be electrically connected to the outside, and a connection wiring portion 51 that connects each of the extraction wiring portions 50a to 50c to each solar cell string 6.

[0033] <Back surface side sealing member 8> As shown in FIG. 3 , the back surface side sealing member 8 has a planar extension and covers the back surface 3 side of the solar cell string 6, and as shown in FIG. 4 , includes a first back surface side sealing material 80 (inner sealing material), a second back surface side sealing material 81 (colored sealing material), and a back surface side substrate 82.

[0034] (First rear-surface-side sealing material 80) The first rear-surface-side sealing material 80 is an insulating sealing material having sealing and insulating properties, and is an adhesive material that bonds the solar cell strings 6 and wiring members 7 to the second rear-surface-side sealing material 81, as shown in Figures 3 and 4. The first rear-surface-side sealing material 80 is elastic and can deform along the solar cell strings 6 and wiring members 7 as shown in Figure 5, thereby burying the solar cell strings 6 and wiring members 7 together with the first light-receiving-side sealing material 10. The first rear-surface-side sealing material 80 is not particularly limited as long as it has sealing and insulating properties, and for example, a resin sealing material such as a polyolefin elastomer can be used.

[0035] (Second Rear-Side Sealing Material 81) The second rear-side sealing material 81 is an insulating sealing material with sealing and insulating properties, and is an adhesive material that bonds between the first rear-side sealing material 80 and the rear-side substrate 82, as shown in FIG. 4 . The second rear-side sealing material 81 is not particularly limited as long as it has sealing and insulating properties, and for example, a resin sealing material such as an ionomer can be used. The second rear-side sealing material 81 is a colored, non-transparent colored sealing material that is substantially not translucent, and is preferably a colored, opaque colored sealing material. From the viewpoint of suppressing reflection of the room 202 on the rear-side substrate 82, the second rear-side sealing material 81 is preferably opaque and black or white, and more preferably opaque and white.

[0036] (Rear surface side substrate 82) The rear surface side substrate 82 is an insulating sealing substrate having sealing and insulating properties, and is a member that constitutes the rear surface 3, as shown in Fig. 2. The rear surface side substrate 82 of this embodiment has a smooth surface on the light-receiving surface 2 side, and includes a smooth portion 100 and an uneven portion 101 on the surface on the rear surface 3 side, as shown in Figs.

[0037] The smooth portion 100 has a smooth surface shape and is a region that extends in a lattice pattern in the horizontal direction X and the vertical direction Y as shown in Fig. 4, and includes first extending portions 110 and second extending portions 111 that intersect with each other. The arithmetic mean roughness Ra of the smooth portion 100 is preferably 0 μm or more and 20 μm or less, from the viewpoint of making the second back-surface-side sealing material 81 easily visible.

[0038] The first stretched portion 110 is a longitudinal stretched portion that has a width in the horizontal direction X and extends linearly in the vertical direction Y. The width of the first stretched portion 110 is preferably 0.05 mm or more and 0.2 mm or less.

[0039] The second stretched portion 111 is a laterally stretched portion that has a width in the vertical direction Y and extends linearly in the horizontal direction X. The width of the second stretched portion 111 is preferably 0.1 mm or more and 0.2 mm or less. The width of the second stretched portion 111 may be the same as or different from the width of the first stretched portion 110.

[0040] As shown in Fig. 4, the uneven portion 101 is made up of a plurality of recesses 120. The recesses 120 are rectangular in shape when viewed from above, and are recesses that are recessed toward the solar cell string 6 side relative to the smooth portion 100 as shown in Fig. 5, with an uneven surface 121 formed at the bottom. The arithmetic mean roughness Ra of the uneven surface 121 is greater than the arithmetic mean roughness Ra of the smooth portion 100, and is preferably greater than 0 µm and equal to or less than 50 µm.

[0041] As shown in Figure 4, the recess 120 is surrounded by the first extension portion 110 and the second extension portion 111, and the inner wall is formed by the first extension portion 110 and the second extension portion 111. The depth of the recess 120 (the distance from the smooth portion 100 to the uneven surface 121) is preferably 0.05 mm or more and 0.2 mm or less. The length of the recess 120 in the vertical direction Y (the length in the extension direction of the first extension portion 110) is preferably 0.5 mm or more and 1.5 mm or less. The length of the recess 120 in the horizontal direction X (the length in the extension direction of the second extension portion 111) is preferably 0.5 mm or more and 1.5 mm or less.

[0042] The material of the rear substrate 82 is not particularly limited as long as it has sealing and insulating properties, and for example, a glass substrate such as figured glass can be used.

[0043] Next, the positional relationship between the various parts of the solar cell module 1 of this embodiment will be described.

[0044] As shown in FIGS. 2A and 3, the solar cell module 1 has a plurality of solar cell strings 6 arranged side by side at intervals in the lateral direction X.

[0045] 3, the wiring member 7 is provided such that, in a plan view, the extracting wiring portions 50a to 50c surround the periphery of the solar cell string 6. As shown in FIGS. 3 and 5, the connecting wiring portion 51 of the wiring member 7 is connected to the negative electrode terminal portion 42 or the positive electrode terminal portion 43 of the solar cell string 6, and electrically connects each solar cell string 6 to the extracting wiring portions 50a to 50c via the connecting wiring portion 51.

[0046] When the solar cell module 1 is viewed in plan from the light-receiving surface 2 side as shown in Figures 2(a) and 5, the wiring shielding member 13 is interposed between the second light-receiving-side sealing material 11 and the light-receiving-side substrate 12, and a portion of the wiring shielding member 13 overlaps with the solar cell string 6 and the wiring member 7.

[0047] As shown in Fig. 6 , when viewed from the rear surface 3 side, the solar cell module 1 has an arrangement area 125 in which the second rear surface-side sealing material 81 is arranged, which has a see-through area 130 and a difficult-to-see-through area 131. The arrangement area 125 is an area to which the second rear surface-side sealing material 81 belongs when viewed from the rear surface, and is an area that matches the size of the second rear surface-side sealing material 81. In this embodiment, the arrangement area 125 is the entire solar cell module 1, as surrounded by the thick line in Fig. 6 .

[0048] The see-through region 130 is a region through which the second back-surface-side sealing material 81 can be seen, and corresponds to the smooth portion 100. That is, the see-through region 130 is a region through which reflected light from the second back-surface-side sealing material 81 is transmitted to the room 202. As shown in Fig. 6 , the see-through region 130 spreads in a lattice pattern and includes a first see-through extension portion 140 and a second see-through extension portion 141, which intersect with each other.

[0049] The area of ​​the perspective region 130 is preferably 10% or more, and more preferably 30% or more, of the entire area of ​​the placement region 125. The area of ​​the perspective region 130 is preferably 90% or less, and more preferably 50% or less, of the entire area of ​​the placement region 125.

[0050] The difficult-to-see-through region 131 is a region that is more difficult to see through than the see-through region 130, and is a region that corresponds to the uneven portion 101. In other words, the difficult-to-see-through region 131 is a region where reflected light from the second back surface side sealing material 81 is difficult or not transmitted to the room 202 side. As shown in Figure 6, the difficult-to-see-through region 131 is made up of a plurality of scattering regions 142 that correspond to the recesses 120, and is a region that is blurred and difficult to see compared to the see-through region 130. The scattering regions 142 are rectangular regions that are arranged at equal intervals vertically and horizontally.

[0051] The area of ​​the difficult-to-see-through region 131 is preferably larger than the area of ​​the see-through region 130 in order to suppress reflection of the room 202, and more preferably 1.5 times or more the area of ​​the see-through region 130. The area of ​​the difficult-to-see-through region 131 is more preferably 3 times or less the area of ​​the see-through region 130 in order to make it easier for the color of the second back-surface-side sealing material 81 to be reflected in the appearance.

[0052] According to the solar cell module 1 of this embodiment, when viewed in a plan view from the back surface side substrate 82 side, the arrangement region 125 where the second back surface side sealing material 81 is arranged includes a see-through region 130 through which the second back surface side sealing material 81 can be seen through and a difficult-to-see-through region 131 in which the color of the second back surface side sealing material 81 is reflected but which is more difficult to see through than the see-through region 130. That is, when viewed from the back surface side substrate 82 side, the see-through region 130 in which the second back surface side sealing material 81 is visible and the color of the second back surface side sealing material 81 is reflected in the appearance is mixed with the difficult-to-see-through region 131 in which the color of the second back surface side sealing material 81 is reflected in the appearance but the second back surface side sealing material 81 is difficult to see clearly and reflections are difficult to occur. Therefore, reflections on the back surface side substrate 82 are less likely to occur when viewed from the back surface 3 side than in the past. As a result, by using the solar cell module 1 for the handrail 201, electricity can be generated by receiving light on the light receiving surface 2, the room 202 is hard to see from the road side, the color of the second back surface side sealing material 81 can be seen both from the road side and from the room 202 side, and further reflection of the room 202 can be suppressed.

[0053] According to the solar cell module 1 of this embodiment, the uneven portion 101 is configured with a recess 120 recessed relative to the smooth portion 100, and when viewed in plan from the rear surface side substrate 82 side, the smooth portion 100 belongs to the see-through region 130, and the uneven portion 101 belongs to the difficult-to-see-through region 131. Therefore, light is diffused in the difficult-to-see-through region 131, making it more difficult for the room 202 to be reflected on the rear surface side substrate 82.

[0054] According to the solar cell module 1 of this embodiment, the unevenness-forming portion 101 is configured with a recess 120, and an uneven surface 121 is formed on the bottom of the recess 120. Therefore, light is diffused by the uneven surface 121, making it more difficult for the room 202 to be reflected on the back-surface-side substrate 82.

[0055] According to the solar cell module 1 of this embodiment, the first back-side sealing material 80 is provided between the second back-side sealing material 81 and the solar cell string 6, and the second back-side sealing material 81 has a smooth surface facing the first back-side sealing material 80. Therefore, irregularities caused by the solar cell string 6 or the like are less likely to be formed on the second back-side sealing material 81, and the second back-side sealing material 81 is easily visible in the see-through region 130 by looking through the back-side substrate 82.

[0056] According to the solar cell module 1 of this embodiment, the surface of the second back-side sealing material 81 facing the back-side substrate 82 is in contact with the back-side substrate 82, and the surface of the back-side substrate 82 facing the solar cell string 6 is smooth. Therefore, the second back-side sealing material 81 is easily visible through the back-side substrate 82 in the see-through region 130, and the color of the second back-side sealing material 81 is easily reflected on the back surface 3.

[0057] According to the solar cell module 1 of this embodiment, the area of ​​the see-through region 130 is preferably 30% to 90% of the entire area of ​​the arrangement region 125. This makes it easier for the color of the second back-surface-side sealing material 81 to be reflected on the back surface 3, and reduces the possibility of reflection of the room 202 when used as the handrail 201.

[0058] Next, a solar cell module 301 according to a second embodiment of the present invention will be described. Note that the same components as those in the solar cell module 1 according to the first embodiment will be denoted by the same reference numerals and will not be described again. The same applies hereinafter.

[0059] The solar cell module 301 of the second embodiment differs from the solar cell module 1 of the first embodiment in the rear surface substrate 302. The rear surface substrate 302 has a smooth portion 100 and an uneven portion 311 on the rear surface 3 side, as shown in FIG.

[0060] The uneven portion 311 is formed by a plurality of convex portions 320. When viewed in plan from the rear surface 3 side, the uneven portion 311 is preferably distributed so that the convex portions 320 fill the plane, and the distance between adjacent convex portions 320 is preferably equal. In other words, the uneven portion 311 is preferably such that the shape obtained by connecting the vertices of the closest convex portions 320, 320 forms an equilateral triangle or a square.

[0061] As shown in Figures 7 and 8, the convex portion 320 is a convex portion that protrudes in a curved shape relative to the smooth portion 100 and has a rounded top. The convex portion 320 is circular when viewed in plan from the rear surface 3 side as shown in Figure 9 and arc-shaped when viewed in cross section as shown in Figure 8, allowing it to refract light like a convex lens. The diameter of the convex portion 320 when viewed in plan from the rear surface 3 side is preferably 0.5 mm to 1.5 mm, and more preferably 0.75 mm to 1.0 mm. The height of the convex portion 320 (the protruding length from the smooth portion 100) is preferably 0.1 mm to 0.5 mm. The shortest distance between the convex portions 320, 320, is preferably 0.1 mm to 0.2 mm.

[0062] As shown in FIG. 9 , when viewed from the rear surface 3 side, the solar cell module 301 includes a see-through region 330 and a difficult-to-see-through region 331 in the arrangement region 125 where the second rear surface sealing material 81 is arranged. The see-through region 330 corresponds to the smooth portion 100 and is formed in the gap at the base end of the convex portion 320. The difficult-to-see-through region 331 is a region that is more difficult to see through than the see-through region 330 and corresponds to the uneven portion 311. The difficult-to-see-through region 331 is composed of multiple scattering regions 342 corresponding to the convex portion 320 and is a region that is blurred and difficult to see compared to the see-through region 330. The difficult-to-see-through regions 331 are circular regions that are evenly distributed. The see-through regions 330 are formed in the gaps between the scattering regions 342 and are continuous so as to surround the scattering regions 342.

[0063] According to the solar cell module 301 of the second embodiment, the uneven portion 311 is composed of convex portions 320 that protrude relative to the smooth portion 100, and when viewed in plan from the rear surface side substrate 302 side, the smooth portion 100 belongs to a see-through region 330, and the uneven portion 311 belongs to a difficult-to-see-through region 331. Therefore, in the difficult-to-see-through region 331, light is reflected by the convex portions 320 of the rear surface side substrate 302, making it more difficult for the room 202 to be reflected on the rear surface side substrate 302.

[0064] According to the solar cell module 301 of the second embodiment, the convex portions 320 constituting the unevenness forming portion 311 are curved and protrude. Therefore, in the difficult-to-see-through region 331, light is diffused within the rear surface substrate 302 by the convex portions 320, making it more difficult for the room 202 to be reflected on the rear surface substrate 302.

[0065] Next, a solar cell module 401 according to a third embodiment of the present invention will be described.

[0066] The solar cell module 401 of the third embodiment differs from the solar cell module 1 of the first embodiment in the rear substrate 402. As shown in FIG. 10 , the rear substrate 402 includes a smooth portion 100 and a textured portion 411 on the rear surface 3 side. The textured portion 411 is formed by a plurality of recesses 420. When viewed in plan from the rear surface 3, the recesses 420 are preferably distributed so as to fill the plane, and the distance between adjacent recesses 420 is preferably equal. That is, the shape of the recesses 420 connecting the bottoms of the closest recesses 420 is preferably an equilateral triangle or a square. The recesses 420 are recesses that are curved relative to the smooth portion 100 and have rounded bottoms. When viewed in plan from the rear surface 3 side, the recesses 420 are circular, and when viewed in cross section as shown in FIG. 11 , they are arc-shaped, allowing them to bend light like a concave lens. The diameter of the recess 420 when viewed from the rear surface 3 side is preferably 0.5 mm to 1 mm, and more preferably 0.8 mm to 0.95 mm. The depth of the recess 420 is preferably 0.1 mm to 0.5 mm. The shortest distance between the recesses 420, 420 is preferably 0.05 mm to 0.15 mm.

[0067] As shown in FIG. 12 , when viewed from the rear surface 3, the solar cell module 401 includes a see-through region 430 and a difficult-to-see-through region 431 in the arrangement region 125 where the second rear surface sealing material 81 is arranged. The see-through region 430 corresponds to the smooth portion 100 and is formed to fill the gap at the base end of the recess 420. The difficult-to-see-through region 431 is a region that is more difficult to see through than the see-through region 430 and corresponds to the uneven portion 411. The difficult-to-see-through region 431 is formed by multiple scattering regions 442 corresponding to the recess 420 and is a region that is blurred and difficult to see compared to the see-through region 430. The difficult-to-see-through regions 431 are circular regions that are evenly distributed. The see-through regions 430 are formed in the gaps between the scattering regions 442 and are continuous so as to surround the scattering regions 442.

[0068] According to the solar cell module 401 of the third embodiment, the recess 420 constituting the unevenness forming portion 411 is recessed in a curved shape. Therefore, in the difficult-to-see-through region 431, light is diffused from the rear surface side substrate 302, making it more difficult for the room 202 to be reflected on the rear surface side substrate 302.

[0069] In the above-described embodiment, the uneven portion 101, 311, 411 has the regularly arranged convex portions 320 or the regularly arranged concave portions 120, 420, but the present invention is not limited to this. The uneven portion 101, 311, 411 may have the irregularly arranged convex portions 320 or the irregularly arranged concave portions 120, 420.

[0070] In the above-described embodiment, the surface of the light-receiving side substrate 12 on the light-receiving surface 2 side is smooth, but the present invention is not limited to this, and the light-receiving side substrate 12 may have fine irregularities formed on the surface on the light-receiving surface 2 side that provide anti-glare functionality.

[0071] In the above-described embodiment, both surfaces of the light-receiving-side substrate 12 are smooth, but the present invention is not limited to this. The light-receiving-side substrate 12 may have an uneven surface formed on at least one of its main surfaces. The light-receiving-side substrate 12 may have an uneven surface on its inner side (the side facing the solar cell string 6) or on its outer side (the side opposite the solar cell string 6). When the uneven surface is on the outer side (the side opposite the solar cell string 6), it is preferable that the unevenness of the uneven surface be finely uneven to provide an anti-glare function.

[0072] In the above-described embodiment, the surface of the rear surface side substrate 82 facing the solar cell string 6 is a smooth surface, but the present invention is not limited to this. The surface of the rear surface side substrate 82 facing the solar cell string 6 may be an uneven surface.

[0073] In the first embodiment described above, the first extension portion 110 extends in the longitudinal direction Y, and the second extension portion 111 extends in the transverse direction X. However, the present invention is not limited to this. The first extension portion 110 may extend in a direction different from the second extension portion 111, other than the longitudinal direction Y, and the second extension portion 111 may extend in a direction different from the first extension portion 110, other than the transverse direction X. Although the first extension portion 110 is perpendicular to the second extension portion 111, the present invention is not limited to this. The first extension portion 110 may be inclined with respect to the second extension portion 111.

[0074] In the above-described embodiment, two back surface sealing materials 80, 81 are provided between the solar cell string 6 and the back surface substrate 82, but the present invention is not limited to this. There may be only one back surface sealing material between the solar cell string 6 and the back surface substrate 82.

[0075] In the above-described embodiment, the solar cell string 6 has the solar cells 40, 40 connected in a single ring configuration, but the present invention is not limited to this. The solar cell string 6 may have the solar cells 40, 40 connected by other connection methods. For example, the solar cells 40, 40 may be connected by conductive tab wires.

[0076] In the above embodiment, the solar cell module 1 is used on the handrail 201 of the balcony 200, but the present invention is not limited to this. The solar cell modules 1, 301, and 401 can also be used for other purposes such as on a wall surface.

[0077] In the first embodiment described above, six solar cell strings 6 are provided, but the present invention is not limited to this. One to five solar cell strings 6 may be provided, or seven or more solar cell strings 6 may be provided.

[0078] In the first embodiment described above, the solar cell strings 6 are arranged in the horizontal direction X, but the present invention is not limited to this. The solar cell strings 6 may be arranged in the vertical direction Y.

[0079] In the first embodiment described above, the first extension portion 110 extends linearly, but the present invention is not limited to this. The first extension portion 110 may extend in a curved shape or a zigzag shape. Similarly, the second extension portion 111 extends linearly, but the present invention is not limited to this. The second extension portion 111 may extend in a curved shape or a zigzag shape.

[0080] In the second embodiment described above, the concave-convex portion 311 has the plurality of convex portions 320 distributed at equal intervals, but the present invention is not limited to this. The concave-convex portion 311 may have the plurality of convex portions 320 distributed randomly.

[0081] In the second embodiment described above, the convex portion 320 has a circular shape when viewed from the rear surface 3 side, but the present invention is not limited to this. The convex portion 320 may have an elliptical shape or an oval shape when viewed from the rear surface 3 side.

[0082] In the third embodiment described above, the concave-convex portion 411 has the plurality of recesses 420 distributed at equal intervals, but the present invention is not limited to this. The concave-convex portion 411 may have the plurality of recesses 420 distributed randomly.

[0083] In the third embodiment described above, the recess 420 has a circular shape when viewed from the rear surface 3 side, but the present invention is not limited to this. The recess 420 may have an elliptical shape or an oval shape when viewed from the rear surface 3 side.

[0084] In the above-described embodiments, each component can be freely substituted or added between the respective embodiments as long as it falls within the technical scope of the present invention.

[0085] REFERENCE SIGNS LIST 1, 301, 401 Solar cell module 12 Light-receiving side substrate 40 Solar cell (solar cell) 80 First rear surface side sealing material (inner sealing material) 81 Second rear surface side sealing material (colored sealing material) 82, 302, 402 Rear surface side substrate 100 Smooth portion 101, 311, 411 Concave / convex portion 120, 420 Concave portion 125 Arrangement region 130, 330, 430 See-through region 131, 331, 431 Difficult-to-see-through region 320 Convex portion

Claims

1. A solar cell module in which solar cells are arranged between a light-receiving substrate and a back-side substrate, and a colored sealing material is arranged between the solar cells and the back-side substrate, wherein, when viewed in a plane from the back-side substrate side, the arrangement area where the colored sealing material is arranged has a see-through area through which the colored sealing material can be seen, and a difficult-to-see-through area in which the color of the colored sealing material is reflected but which is more difficult to see through than the see-through area.

2. The solar cell module according to claim 1, wherein the rear substrate has a smooth portion and a roughened portion on the rear surface, the roughened portion being composed of a convex portion that protrudes from the smooth portion or a concave portion that is recessed from the smooth portion, and when viewed in a plane from the rear substrate side, the smooth portion belongs to the see-through area and the roughened portion belongs to the difficult-to-see-through area.

3. The solar cell module according to claim 2, wherein the uneven portion is constituted by the recess, and the bottom of the recess is formed with an uneven surface.

4. The solar cell module according to claim 2, wherein the uneven portion is made up of the convex portions, and the convex portions protrude in a curved shape.

5. The solar cell module according to claim 2, wherein the uneven portion is formed by the recess, and the recess is recessed in a curved shape.

6. The solar cell module according to any one of claims 1 to 5, further comprising an inner sealing material between the colored sealing material and the solar cells, wherein the colored sealing material has a smooth surface facing the inner sealing material.

7. The solar cell module according to any one of claims 1 to 5, wherein the surface of the colored encapsulant facing the back surface substrate is in contact with the back surface substrate, and the surface of the back surface substrate facing the solar cell is smooth.

8. The solar cell module according to any one of claims 1 to 5, wherein the area of ​​the see-through region is 30% to 90% of the total area of ​​the placement region.

Images