Solar cell modules

Abstract

To provide a solar cell module that can improve the anti-glare effect. [Solution] The solar cell module 1 includes a light-receiving surface S1 of the solar cell module 1 and comprises a translucent substrate 10 made of patterned glass. The light-receiving surface S1 of the translucent substrate 10 has a first uneven surface 13 including alternately arranged first protrusions 11 and first recesses 12, and a first raised structure 15 which is more finely constructed than the first uneven surface 13 and has a plurality of densely packed first raised portions 14 arranged on the first surface of the first uneven surface 13.

Description

Technical Field

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

Background Art

[0002] Conventionally, it has been pointed out that reflected light from a solar cell module may dazzle target persons such as pedestrians or drivers passing through the surrounding area and become an obstacle to passage. There is a demand for a solar cell module with high anti-glare effect that reduces the amount of reflected light from the solar cell module received by target persons. For example, Patent Document 1 discloses a method for producing tempered glass excellent in anti-glare performance, reliability, and mechanical strength, and an anti-glare crystalline solar cell module using the same that has an excellent appearance without glare such as glares caused by reflection of sunlight.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the conventional technology described in Patent Document 1, in order to improve the anti-glare property of the glass including the light-receiving surface of the solar cell module, blasting is performed with an abrasive having a large particle size, followed by blasting with an abrasive having a small particle size, and then heat treatment is performed. When blasting is used, the surface of the glass is physically destroyed to form irregularities, so the strength of the convex portions formed on the surface is lowered, and the convex portions may be easily broken. Therefore, when the solar cell module is installed and exposed to the natural environment, the tips of the convex portions may wear out due to aging, which may cause a decrease in anti-glare performance. Accordingly, there was room for improvement in the anti-glare effect.

[0005] An object of the present disclosure is to provide a solar cell module capable of improving the anti-glare effect. [Means for solving the problem]

[0006] A solar cell module according to one embodiment of the present disclosure The solar cell module includes a light-receiving surface and comprises a light-transmitting substrate made of patterned glass, The light-receiving surface of the light-transmitting substrate is A first uneven portion including first protruding portions and first recessed portions arranged alternately, A plurality of densely packed first ridges are arranged on the first surface of the first uneven portion, and a first ridge structure is formed that is finer than the first uneven portion, It holds. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide a solar cell module that can improve the anti-glare effect. [Brief explanation of the drawing]

[0008] [Figure 1] This is a configuration diagram showing an example of the configuration of a solar cell module according to one embodiment of this disclosure. [Figure 2] This is a schematic diagram showing a magnified view from above of a portion of the light-receiving surface in Figure 1. [Figure 3] This is a schematic diagram showing the cross-sectional shape of the first uneven portion along the shorter axis of Figure 2. [Figure 4] Figure 1 is a schematic diagram showing an enlarged view of the side surface of the translucent substrate. [Figure 5] This is a schematic diagram showing an example of the configuration of a frame placed on the translucent substrate shown in Figure 1. [Figure 6] This is the first schematic diagram illustrating an example of the function of the translucent substrate shown in Figure 1. [Figure 7] This is a second schematic diagram illustrating an example of the function of the translucent substrate shown in Figure 1. [Figure 8] This is the first schematic diagram illustrating an example of the effect of the solar cell module shown in Figure 1. [Figure 9]This is a second schematic diagram illustrating an example of the effect of the solar cell module shown in Figure 1. [Modes for carrying out the invention]

[0009] In the following, one embodiment of this disclosure will be mainly described with reference to the attached drawings.

[0010] Figure 1 is a configuration diagram showing an example of the configuration of a solar cell module 1 according to one embodiment of the present disclosure. An example of the configuration of a solar cell module 1 according to one embodiment of the present disclosure will be mainly described with reference to Figure 1. The solar cell module 1 has a light-receiving surface S1 and a back surface S2 located on the opposite side of the light-receiving surface S1 in the solar cell module 1. The back surface S2 corresponds to the "second back surface" described in the claims.

[0011] The solar cell module 1 comprises, in order from the light-receiving surface S1 toward the back surface S2, a translucent substrate 10 including the light-receiving surface S1, a first encapsulant 20, a solar cell 30, a second encapsulant 40, and a back surface material 50 including the back surface S2. The solar cell module 1 is constructed by laminating and integrating the back surface material 50, the second encapsulant 40, the solar cell 30, the first encapsulant 20, and the translucent substrate 10 toward the light-receiving surface S1. The solar cell module 1 converts the light energy of sunlight into electrical energy by transmitting sunlight received on the light-receiving surface S1 through the translucent substrate 10 and the first encapsulant 20 and directing it into the solar cell 30.

[0012] The light-transmissive substrate 10 functions as a protective material that protects the inner side on the surface of the solar cell module 1. The light-transmissive substrate 10 includes the light-receiving surface S1 of the solar cell module 1 and is formed of patterned glass. In the present disclosure, "patterned glass" includes, for example, glass specified in JIS R3203. Patterned glass includes, for example, a plate glass having a pattern on one surface, which is manufactured by hot-transferring a pattern engraved on a roll onto a glass surface by a roll-out method. Unlike blasted glass as in the prior art, in patterned glass, the pattern on the glass surface transferred by a transfer roll has a large difference in elevation.

[0013] In the present disclosure, "pattern" means, for example, a pattern in which a fixed pattern or design is repeated. The pattern includes, for example, a hexagonal mesh pattern described below that has a fixed pattern. Without being limited thereto, the pattern may include other polygonal, circular, or elliptical mesh patterns different from hexagons, and may also include other patterns such as a pear-skin pattern.

[0014] The light-receiving surface S1 of the light-transmissive substrate 10 has a first uneven portion 13 including first protrusions 11 and first recesses 12 that are alternately arranged. The first uneven portion 13 is continuously arranged over a predetermined region on the light-receiving surface S1. The area of the region where the first uneven portion 13 is arranged is, for example, half or more of the surface area of the light-receiving surface S1. In FIG. 1, as an example, the first uneven portion 13 is continuously arranged over the entire light-receiving surface S1.

[0015] The light-receiving surface S1 of the light-transmissive substrate 10 has a first raised structure 15 that is formed finer than the first uneven portion 13, with a plurality of densely arranged first raised portions 14 on the surface of the first uneven portion 13. The first raised portions 14 include, for example, dome-shaped protrusions. The surface of the first uneven portion 13 corresponds to the "first surface" recited in the claims.

[0016] In FIG. 1, for the purpose of simple illustration, the first concavo-convex portion 13 on the light-receiving surface S1 of the translucent substrate 10 is schematically shown by a broken line, and the first raised structure 15 is schematically shown separated by solid lines. However, in actuality, the first raised structures 15 are continuously arranged over a predetermined region on the surface of the first concavo-convex portion 13. In the predetermined region, the surface of the first concavo-convex portion 13 is formed as a non-planar surface on which fine granular structures are arranged instead of a flat surface, for example, by dome-shaped protrusions. The area of the region where the first raised structures 15 are arranged is, for example, not less than half of the surface area of the surface of the first concavo-convex portion 13. In FIG. 1, as an example, the first raised structures 15 are continuously arranged over the entire surface of the first concavo-convex portion 13.

[0017] FIG. 2 is a schematic diagram showing an enlarged top view of a part of the light-receiving surface S1 of FIG. 1. FIG. 3 is a schematic diagram showing a cross-sectional shape of the first concavo-convex portion 13 along the short axis D2 of FIG. 2. In FIG. 2 and FIG. 3, for the purpose of simple illustration of the drawings, illustration of the first raised structure 15 is omitted, and only the first concavo-convex portion 13 is mainly shown. The configuration of the light-receiving surface S1 of the translucent substrate 10 will be described in more detail with reference to FIG. 2.

[0018] On the light-receiving surface S1, the first protrusions 11 and the first recesses 12 are alternately arranged at a constant period. The first protrusion 11 has a first flat portion 111 at the apex. The first recess 12 includes: an inclined portion 121 inclined from the first flat portion 111 on the light-receiving surface S1; and a second flat portion 122 connected to the inclined portion 121 and located at the bottom. The first recess 12 is defined by the first protrusions 11. The first raised structure 15 may be disposed at least on the first flat portion 111 and / or the second flat portion 122.

[0019] For example, as shown in Figure 2, the first recessed portion 12 is a basin-shaped portion configured in a hexagonal shape in a plan view of the light-receiving surface S1. The first recessed portion 12 is surrounded by the first protruding portion 11. As a result, the pattern of the translucent substrate 10 becomes, for example, a hexagonal mesh pattern having a certain pattern. In other words, the pattern of the translucent substrate 10 is a pattern in which the hexagonal first recessed portions 12 are arranged regularly in a matrix.

[0020] In a plan view of the light-receiving surface S1, the first recessed portion 12, demarcated by the first flat portion 111, has a first axis and a second axis that are orthogonal to each other. For example, in a plan view of the light-receiving surface S1, the first recessed portion 12, demarcated by the first flat portion 111, has a longitudinal axis D1 and a transverse axis D2 that are orthogonal to each other. The first recessed portion 12 is not configured such that the number of axes of symmetry is the same as the number of angles, like a regular hexagon, but rather has an elongated hexagonal shape that is wider along the longitudinal axis D1 and narrower along the transverse axis D2.

[0021] As shown in Figures 2 and 3, when the first recessed portion 12 is viewed along the short axis D2, the entire first recessed portion 12, including the second flat portion 122 and the pair of inclined portions 121 located on both sides of the second flat portion 122, has a width d1. The width d1 is, for example, 600 μm. Of the total width d1 of the first recessed portion 12, each of the pair of inclined portions 121 has a width d2. The width d2 is, for example, 150 μm. Of the total width d1 of the first recessed portion 12, the second flat portion 122 has a width d3. The width d3 is, for example, 300 μm.

[0022] When the first protrusion 11 is viewed along the short axis D2, the first flat portion 111 of the first protrusion 11, which is positioned around the first recess 12 and demarcates the first recess 12, has a width d4. The width d4 is, for example, 100 μm. In addition, the first protrusion 11 has a height H. The height H is the difference in height between the first uneven portion 13. In other words, the height H is the distance from the first recess 12 to the first protrusion 11 in the thickness direction of the translucent substrate 10. In Figure 3, the thickness direction of the translucent substrate 10 corresponds, for example, to the vertical direction. The height H is, for example, included in the range of 20 μm to 40 μm. As described above, the width d4 of the first flat portion 111 along the short axis D2 is narrower than the width d3 of the second flat portion 122 along the short axis D2.

[0023] As shown in Figure 2, when the first recessed portion 12 is viewed along the longitudinal axis D1, the entire first recessed portion 12, including the second flat portion 122 and the pair of inclined portions 121 located on both sides of the second flat portion 122, has a width d5. The width d5 ​​is, for example, 1100 μm.

[0024] The surface of the translucent substrate 10 having a pattern as shown in Figure 2 can be confirmed, for example, by taking a plan view image toward the light-receiving surface S1 using a laser microscope. The longitudinal axis D1 and the transverse axis D2 can be confirmed using the laser microscope and an image of the light-receiving surface S1 taken in a plan view. The widths d1, d2, d3, and d4 may be measured based on the image of the light-receiving surface S1 taken in a plan view with the laser microscope, or they may be measured based on the result of a linear scan along the direction of the transverse axis D2, for example. The width d5 ​​may be measured based on the image of the light-receiving surface S1 taken in a plan view with the laser microscope, or they may be measured based on the result of a linear scan along the direction of the longitudinal axis D1, for example.

[0025] The height H may be measured, for example, using a stylus profiler or a laser microscope. For example, when a stylus profiler is used, the height H may be measured based on a linear scan over a predetermined length, such as 3 mm. If the first flat portion 111 or the second flat portion 122 is not flat but has minute irregularities, the height H may be measured as an average value.

[0026] Referring again to Figure 1, the translucent substrate 10 has a back surface S3 located on the opposite side of the light-receiving surface S1. The back surface S3 corresponds to the "first back surface" described in the claims. The back surface S3 of the translucent substrate 10 has a second raised structure 17 which is more finely constructed than the first uneven surface 13, with a plurality of densely packed second raised portions 16 arranged therein. The second raised portions 16 include, for example, dome-shaped raised portions, similar to the first raised portions 14.

[0027] On the back surface S3, the second raised structure 17 is continuously arranged over a predetermined area. In this predetermined area, the back surface S3 is configured as a non-planar surface with a fine granular structure arranged not as a flat surface, for example, by dome-shaped raised areas. The area of ​​the region where the second raised structure 17 is arranged is, for example, more than half of the surface area of ​​the back surface S3. In Figure 1, as an example, the second raised structure 17 is continuously arranged over the entire back surface S3.

[0028] The translucent substrate 10 has a side surface S4 that connects the light-receiving surface S1 and the back surface S3 located on the opposite side of the light-receiving surface S1. In Figure 1, a pair of side surfaces S4 are arranged on both the left and right sides. The side surface S4 of the translucent substrate 10 has a third raised structure 19 which is composed of a plurality of densely packed third raised portions 18 and is finer than the first uneven portion 13. The third raised portions 18 include, for example, dome-shaped raised portions, similar to the first raised portions 14.

[0029] The third raised structure 19 is continuously arranged over a predetermined region on the side surface S4. In this predetermined region, the side surface S4 is configured as a non-planar surface with a fine granular structure, rather than a flat surface, formed by, for example, dome-shaped raised areas. The area of ​​the region where the third raised structure 19 is arranged is, for example, more than half of the surface area of ​​the side surface S4. In Figure 1, as an example, the third raised structure 19 is continuously arranged over a portion of the side surface S4.

[0030] Figure 4 is a schematic, enlarged view of the side surface S4 of the translucent substrate 10 shown in Figure 1. In Figure 4, for the purpose of simplifying the illustration, the first uneven portion 13 and the first raised structure 15 on the light-receiving surface S1, the second raised structure 17 on the back surface S3, and the third raised structure 19 on the side surface S4 are omitted from the illustration. In Figure 4, the configuration of the side surface S4 is shown primarily for the purpose of explaining the side surface S4.

[0031] The side surface S4 of the translucent substrate 10 has a smoothly formed processed surface S41 at the corner of the side surface S4 and an edge surface S42 that is continuous with the processed surface S41. The processed surface S41 is formed by, for example, chamfering the corner of the side surface S4 to create a smooth inclined surface. The processed surface S41 is a smooth inclined surface that connects the light-receiving surface S1 and the edge surface S42. The edge surface S42 is a plane on the side surface S4 that is perpendicular to the light-receiving surface S1. The third raised structure 19 is arranged, for example, only on the edge surface S42 of the side surface S4.

[0032] The translucent substrate 10 has compressive residual stress in the vicinity of the light-receiving surface S1 and the back surface S3 in the thickness direction, and tensile residual stress in the central part. In Figure 4, the thickness direction of the translucent substrate 10 corresponds, for example, to the vertical direction.

[0033] Referring again to Figure 1, the first encapsulant 20 adheres the back surface S3, located on the opposite side of the light-receiving surface S1 in the light-transmitting substrate 10, to the solar cell 30. The first encapsulant 20 includes, for example, a thermosetting resin such as EVA (Ethylene Vinyl Acetate) or POE (Polyolefin Elastomer). The first encapsulant 20 comes into contact with the second raised structure 17 located on the back surface S3. The first encapsulant 20 penetrates into the gaps between a pair of adjacent second raised portions 16 of the second raised structure 17 and comes into contact with the entire surface of the second raised structure 17.

[0034] Figure 5 is a schematic diagram showing an example of the configuration of a frame 60 arranged on the translucent substrate 10 in Figure 1. The solar cell module 1 further includes a frame 60 that protects the side surface S4 connecting the light-receiving surface S1 and the back surface S3 located on the opposite side of the light-receiving surface S1 on the translucent substrate 10. The frame 60 is fixed around the translucent substrate 10 with its inner surface facing the side surface S4 of the translucent substrate 10. The solar cell module 1 further includes an adhesive 80 that bonds the side surface S4 of the translucent substrate 10 to the frame 60. The adhesive 80 includes, for example, silicone.

[0035] The frame 60 may be made of aluminum or resin, depending on the strength and cost of the solar cell module 1. When the frame 60 is made of aluminum, for example, it is formed by applying anodizing or clear coating to the outer surface of an extruded aluminum molded body to improve weather resistance.

[0036] The frame 60 is positioned such that its inner surface faces the side surface S4 of the translucent substrate 10 and the side surface of the first sealing material 20 via adhesive 80. The frame 60 has a mounting portion 61 which includes an inner circumference to which the side surface S4 of the translucent substrate 10 and the side surface of the first sealing material 20 are attached. The frame 60 has a top plate portion 62 which constitutes the upper part of the mounting portion 61. The cross-section of the entire mounting portion 61, including the top plate portion 62, has a shape such as a U-shape tilted at 90°.

[0037] The frame 60 further has side plate portions 63 that bend at approximately a right angle from the top plate portion 62 and extend downward. The inner surface of the top plate portion 62 faces the edge of the light-receiving surface S1 of the light-transmitting substrate 10 from above. The inner surface of the side plate portion 63 faces the side surface S4 of the light-transmitting substrate 10 from the side via adhesive 80.

[0038] The frame 60 further includes an installation section 64. The installation section 64 is located at the bottom of the frame 60 and is used to fix the solar cell module 1 to an installation location such as a mounting frame. For example, the installation section 64 may be fixed to an installation location such as a mounting frame by using bolts and nuts through through holes through which bolts pass.

[0039] The frame 60 further has a hollow section 65 located between the mounting section 61 and the installation section 64. Inside the hollow section 65, screw holes 66 are provided for fixing another frame 70 to the frame 60 on which the translucent substrate 10 is mounted.

[0040] The frame 60 has a top plate portion 62 facing the light-receiving surface S1 of the translucent substrate 10, and further has a notched groove 67 that extends from the inner circumference to the outer circumference of the frame 60 and extends continuously to the side plate portion 63 of the frame 60. The notched groove 67 is arranged to discharge liquids such as moisture that accumulate on the light-receiving surface S1 of the translucent substrate 10 to the outside of the light-receiving surface S1. The notched groove 67 may be manufactured by further cutting out the notched groove 67 portion of the frame 60, which has been manufactured by extrusion molding or injection molding, or by punching it out by press working.

[0041] Referring again to Figure 1, the solar cell 30 is located in the central part of the laminate of the solar cell module 1, sandwiched between the first encapsulant 20 and the second encapsulant 40. The solar cell 30 includes, for example, any cell that receives sunlight incident from the light-receiving surface S1 and transmitted through the translucent substrate 10 and the first encapsulant 20, and converts the light energy of the sunlight into electrical energy. The solar cell 30 includes, but is not limited to, a single-crystal silicon cell, a polycrystalline silicon cell, an amorphous silicon cell, a GaAs cell, a CIGS cell, a perovskite solar cell, an organic thin-film solar cell, or a quantum dot solar cell.

[0042] The second encapsulant 40 adheres the surface S5 located on the opposite side of the back surface S2 of the back material 50 to the solar cell 30. The second encapsulant 50 includes, for example, a thermosetting resin such as EVA or POE. The second encapsulant 40 contacts the second uneven portion 53, described later, which is located on the surface S5 of the back material 50. The second encapsulant 40 enters the gap between a pair of adjacent second protrusions 51 of the second uneven portion 53, i.e., the second recess 52, and contacts the entire surface of the second uneven portion 53. Surface S5 corresponds to the "second surface" described in the claims.

[0043] The back material 50 functions as a protective material that protects the inside of the back surface S2 of the solar cell module 1. The back material 50 includes the back surface S2 located on the opposite side of the light-receiving surface S1 of the solar cell module 1 and is made of patterned glass. The patterned glass that makes up the back material 50 may be the same as or different from the patterned glass that makes up the light-transmitting substrate 10. For example, the pattern of the patterned glass of the back material 50 may be the same as or different from the pattern of the patterned glass of the light-transmitting substrate 10.

[0044] The surface S5 of the backing material 50 has a second uneven surface 53 which includes alternately arranged second protrusions 51 and second recesses 52. The second uneven surface 53 is continuously arranged over a predetermined area on the surface S5. The area of ​​the region where the second uneven surface 53 is arranged is, for example, more than half of the surface area of ​​the surface S5. In Figure 1, as an example, the second uneven surface 53 is continuously arranged over the entire surface S5.

[0045] Figure 6 is a first schematic diagram illustrating an example of the function of the translucent substrate 10 shown in Figure 1. Figure 6 is a simplified schematic diagram of the configuration of the first uneven portion 13 shown in Figure 3, in order to facilitate understanding of the function of the first uneven portion 13 in the translucent substrate 10. Unlike the trapezoidal first protrusion 11 of the first uneven portion 13 shown in Figure 3, the protrusions are arranged in a rectangular shape. Consider the case where sunlight is incident at an incident angle of 85° on a recess corresponding to the first recess 12 located between a pair of adjacent protrusions.

[0046] The recessed portion has a width L corresponding to the width d1. The protruding portion has a height H. In the light-transmitting substrate 10 of the solar cell module 1, with respect to light incident at an incident angle of 85° along either the first axis or the second axis which has the same length, or the shorter axis D2, the height H of the first protrusion 11 and the width L of the first recessed portion 12 along one axis satisfy the relationship (L / H) ≤ 45.72. For example, with respect to light incident at an incident angle of 85° along the shorter axis D2, the height H of the first protrusion 11 and the width L of the first recessed portion 12 along the shorter axis D2 satisfy the relationship (L / H) ≤ 45.72. This relationship will be explained with reference to the schematic diagram in Figure 6.

[0047] When sunlight enters the recess at an incident angle of 85°, the region R on the bottom surface of the recess, where the sunlight is reflected and propagates as reflected light to the target, has a width of L - 2 × (H × tan85°). In this disclosure, "target" includes, for example, pedestrians or drivers passing around the solar cell module 1. When sunlight enters region R having a width of L - 2 × (H × tan85°), it is reflected, for example, toward the target without being obstructed by the convex portion. On the other hand, even if sunlight enters and is reflected in other regions having a width of 2 × (H × tan85°), excluding region R on the bottom surface, it is further reflected in a direction different from the target due to being obstructed by the convex portion.

[0048] Therefore, if we want to set the amount of reflected light directed towards the target to, for example, 50% or less, then (L-2×(H×tan85°)) / L≦0.5 holds true. Rearranging this condition, we get (11.43H×2) / L≧0.5. Rearranging it further, we get (L / H)≦45.72.

[0049] Figure 7 is a second schematic diagram illustrating an example of the function of the translucent substrate 10 shown in Figure 1. In Figure 7, for the purpose of simplifying the illustration, the first raised structure 15 is omitted, and only the first uneven portion 13 is mainly shown. Referring to Figure 7, the function of the first uneven portion 13 in the translucent substrate 10 will be mainly explained. Consider the case where sunlight is incident at an incident angle of 85° on the first recessed portion 12 located between a pair of adjacent first protrusions 11.

[0050] As described above, the first recessed portion 12 has a total width d1 along the short axis D2. The width d1 corresponds to the width L in Figure 7. In this case, for light incident on the translucent substrate 10 of the solar cell module 1 at an incident angle of 85° along the short axis D2, the height H of the first protrusion 11 and the width L of the first recessed portion 12 along the short axis D2 satisfy the relationship (L / H) ≤ 45.72.

[0051] When sunlight enters the first recess 12 at an incident angle of 85°, the region R on the bottom surface of the first recess 12, where the sunlight is reflected and propagates to the target as reflected light, has a width of L-2 × (H × tan85°), similar to Figure 7. When sunlight enters the region R with a width of L-2 × (H × tan85°), it is reflected towards the target, for example, without being obstructed by the first protrusion 11.

[0052] On the other hand, even if sunlight is incident on other regions with a width of 2 × (H × tan85°) excluding the bottom region R, it is blocked by the first protrusion 11 and reflected in a direction different from that of the target. For example, when sunlight is incident on the surface of the second flat portion 122 excluding region R, it is reflected by the surface of the second flat portion 122 and further reflected by the surface of the inclined portion 121. For example, when sunlight is incident on the surface of the inclined portion 121, it is reflected by that surface and propagates in a direction different from that of the target.

[0053] For example, if the height H is 20 μm, then H × tan85° ≈ 229 μm. Therefore, if L = d1 = 600 μm, the width of region R is L - 2 × (H × tan85°) ≈ 142 μm. In other words, only sunlight incident on region R with a width of approximately 142 μm propagates toward the target. Sunlight incident on other regions in the first recess 12, excluding region R, which has a width of approximately 458 μm, is reflected in a direction different from that of the target.

[0054] An overview of one example of a manufacturing method for solar cell module 1 is provided below.

[0055] The method for manufacturing the solar cell module 1 includes a first step of melting glass raw materials in a melting furnace. The method for manufacturing the solar cell module 1 includes a second step of removing the molten glass raw materials from the first step and transferring the irregularities onto the surface of the molten glass using a roller engraved with irregularities on a rollout machine to form a plate-like body of glass raw materials. The method for manufacturing the solar cell module 1 includes a third step of cooling the plate-like body in an annealing furnace and then cutting it to a predetermined size to form a glass plate material. The method for manufacturing the solar cell module 1 includes a fourth step of frosting the glass plate material to form a translucent substrate 10 with a raised structure. The method for manufacturing the solar cell module 1 includes a fifth step of laminating and integrating the translucent substrate 10, a first encapsulant 20, a solar cell 30, a second encapsulant 40, and a backing material 50.

[0056] The solar cell module 1 can be manufactured by the above-described manufacturing method, thereby improving its anti-glare effect. For example, the first to third steps of the manufacturing method for the solar cell module 1 are the same as those for ordinary patterned glass, and productivity can be improved compared to conventional blast processing. Since the fourth step includes frosting (etching), the durability of the raised structure formed on the glass surface can be improved compared to conventional blast processing, which destroys the glass surface to form irregularities. Therefore, the solar cell module 1 can also improve the strength of the first irregularities 13 and the first raised structure 15 of the translucent substrate 10. Even when the solar cell module 1 is installed and exposed to the natural environment, wear on the tips of the first irregularities 13 and the first raised structure 15 due to changes over time can be reduced, and the anti-glare effect can be maintained.

[0057] According to the above embodiment, it is possible to improve the anti-glare effect. The translucent substrate 10 of the solar cell module 1 is made of patterned glass. In the translucent substrate 10, the first uneven portion 13 of the patterned glass is formed by transferring the unevenness of a roll. Therefore, unlike the unevenness formed using conventional techniques based on blast processing, the translucent substrate 10 can reduce cracks and the like in the first uneven portion 13. As a result, the first uneven portion 13 of the translucent substrate 10 is less susceptible to wear when external force is applied.

[0058] In addition, the first raised structure 15 arranged on the surface of the first uneven portion 13 has a structure in which multiple first raised portions 14 are clustered together, and therefore functions to reduce the concentration of stress on a particular first raised portion 14. Thus, the translucent substrate 10 can be made less susceptible to damage at the first uneven portion 13, thereby improving durability. As a result, the solar cell module 1 can maintain its anti-glare effect for a longer period of time compared to modules manufactured using conventional techniques based on blast processing.

[0059] The solar cell module 1 has a plurality of densely packed first raised portions 14 on the surface of the first uneven portion 13, and a first raised structure 15 which is finer than the first uneven portion 13 on the light-receiving surface S1 of the light-transmitting substrate 10. Therefore, the solar cell module 1 can diffusely reflect incident light of a wide range of incident angles over a wide area, thereby improving the anti-glare effect.

[0060] When viewed from sunlight incident on the light-receiving surface S1, the light-receiving surface S1 can be considered as a collection of small planes distributed across the light-receiving surface S1 that differ in height or angle. From this perspective, the first uneven portion 13 can reduce the reflection of sunlight incident at a low solar altitude, i.e., at a large angle of incidence, such as in the early morning or at dusk, thereby reducing the intensity of the reflected light. As described above with reference to Figures 6 and 7, even if the reflected light of light incident at a large angle of incidence on the first recess 12 of the first uneven portion 13 is specularly reflected at a large angle of reflection, it is blocked by the first protrusion 11 surrounding the first recess 12. In other words, the first recess 12 may function as a light trap.

[0061] In addition, since the first raised structure 15 has a different shape from the first uneven portion 13, it is also possible to diffusely reflect light at an incident angle different from the range in which the first uneven portion 13 functions. Figure 8 is a first schematic diagram illustrating an example of the effect of the solar cell module 1 of Figure 1. Figure 9 is a second schematic diagram illustrating an example of the effect of the solar cell module 1 of Figure 1. Referring to Figures 8 and 9, the diffuse reflection effect realized by the first raised structure 15 will be mainly explained.

[0062] For example, consider the case shown in Figure 8, where the first raised structure 15 is not arranged on the surface of the first uneven portion 13, and light L1 is incident perpendicularly to the light-receiving surface S1 of the translucent substrate 10. In this case, the reflected light L2 of light L1 incident perpendicularly on the first uneven portion 13 at a small incident angle, for example, 0°, is reflected at a reflection angle of 0° and propagates in the exact opposite direction to the propagation direction of light L1. Therefore, when the incident angle of light L1 is small, the diffusion effect of light L1 described above is not sufficient for the first uneven portion 13. The first uneven portion 13 has a first flat portion 111 and a second flat portion 122 arranged along the light-receiving surface S1, and the area ratio occupied by the flat surface in the first uneven portion 13 is relatively large, so light L1 incident perpendicularly toward this flat surface is reflected perpendicularly.

[0063] On the other hand, as shown in Figure 9, the light-receiving surface S1 of the translucent substrate 10 has a first raised structure 15, so that, for example, a surface parallel to the light-receiving surface S1 is placed only at the top of the first raised portion 14, and a surface not parallel to the light-receiving surface S1 is placed at a position different from the top. Therefore, the translucent substrate 10 can also reflect light L1 incident on the surface not parallel to the light-receiving surface S1 in different directions at reflection angles corresponding to the incident position. As a result, the solar cell module 1 can achieve diffuse reflection even for light L1 incident on the light-receiving surface S1 at a small incident angle, thereby improving anti-glare properties. In addition, light L1 incident perpendicularly to the top of the first raised portion 14 is transmitted through the glass due to the glass's low reflectivity, reducing reflection. Therefore, it is considered that light L1 incident perpendicularly to the top of the first raised portion 14 does not have a significant impact on the anti-glare effect.

[0064] As described above, the solar cell module 1 can achieve diffuse reflection for light L1 with a large incident angle using the first uneven surface 13, and diffuse reflection for light L1 with a small incident angle using the first raised structure 15. Therefore, the solar cell module 1 can diffusely reflect light L1 with a wider range of incident angles, thereby improving the anti-glare effect. The solar cell module 1 can exhibit an anti-glare effect over a wide range, from light L1 with a large incident angle to light L1 with a small incident angle. As a result, the solar cell module 1 can reduce the intensity of reflected light L2 directed towards the target on the light-receiving surface S1 of the light-transmitting substrate 10.

[0065] The area of ​​the region where the first raised structure 15 is located is more than half the surface area of ​​the surface of the first uneven portion 13. As a result, the solar cell module 1 can reduce the intensity of reflected light L2 that enters the field of view of the subject. The solar cell module 1 can realize a state in which the subject can more easily see the surrounding situation, including, for example, traffic signs. Therefore, the possibility of the subject being dazzled by reflected light L2 is reduced. Even in cases where reflection of light L1 is generally likely to occur in flat portions such as the first flat portion 111 and the second flat portion 122, the solar cell module 1 can vary the direction of reflection of light L1 by arranging multiple first raised portions 14 on the light-receiving surface S1. Therefore, the solar cell module 1 can reduce the intensity of reflected light L2 in the specular reflection direction and improve the anti-glare effect.

[0066] The back surface S3 of the translucent substrate 10 has a second raised structure 17 which is more finely constructed than the first uneven surface 13, with a plurality of densely packed second raised portions 16 arranged therein. The solar cell module 1 can achieve an anchoring effect between the first sealing material 20 and the translucent substrate 10 by filling the gaps between a pair of adjacent second raised portions 16 in the second raised structure 17 with the first sealing material 20 and curing it.

[0067] The solar cell module 1 can improve the strength of the mechanical adhesion based on the first encapsulant 20. Therefore, even if thermal stress occurs due to differences in the coefficients of linear expansion of the translucent substrate 10 and the first encapsulant 20, the solar cell module 1 can reduce delamination between the translucent substrate 10 and the first encapsulant 20. The solar cell module 1 can increase the adhesive area with the multiple second raised portions 16 of the second raised structure 17, making it more difficult for the first encapsulant 20 to peel off.

[0068] The side surface S4 of the translucent substrate 10 has a third raised structure 19 which is more finely constructed than the first uneven surface 13, with a plurality of densely packed third raised portions 18 arranged therein. The solar cell module 1 can achieve an anchoring effect between the adhesive 80 and the translucent substrate 10 by filling the gap between a pair of adjacent third raised portions 18 in the third raised structure 19 with adhesive 80 and curing it.

[0069] The solar cell module 1 can improve the strength of the mechanical adhesion based on the adhesive 80. Therefore, even if thermal stress occurs due to differences in the coefficients of linear expansion between the translucent substrate 10 and the adhesive 80, for example, the solar cell module 1 can reduce delamination between the translucent substrate 10 and the adhesive 80. The solar cell module 1 can increase the bonding area with the multiple third raised portions 18 of the third raised structure 19, making the adhesive 80 less likely to peel off.

[0070] The solar cell module 1 can reduce contact between the first encapsulant 20 and water or air, for example, around its outer periphery. Therefore, the solar cell module 1 can reduce moisture absorption of the first encapsulant 20. As a result, the solar cell module 1 can reduce deterioration of the first encapsulant 20 due to yellowing or hydrolysis.

[0071] The translucent substrate 10 may be tempered glass having compressive residual stress in the vicinity of the light-receiving surface S1 and the back surface S3 in the thickness direction, and tensile residual stress in the central part. The solar cell module 1 can also be made of heat-tempered glass by subjecting the translucent substrate 10 (glass) to a tempering treatment in which it is heated and then rapidly cooled. The side surface S4 of the translucent substrate 10 has a processed surface S41 that is smoothly formed at the corner and an edge surface S42 that is continuous with the processed surface S41, thereby reducing the occurrence of glass cracking when the translucent substrate 10 is tempered in the solar cell module 1.

[0072] Heat-strengthened glass differs from ordinary glass in how it breaks. For example, ordinary glass breaks radially, producing fragments with sharp edges. On the other hand, in the case of heat-strengthened glass, if a crack reaches the tensile stress layer of the glass, the balance between tensile and compressive stress is disrupted, and the entire material instantly shatters into fine granules. For example, based on these differences, it is possible to determine whether or not the translucent substrate 10 is heat-strengthened glass.

[0073] The frame 60 has notched grooves 67. This allows the solar cell module 1 to discharge liquids such as rainwater that accumulate on the light-receiving surface S1 of the translucent substrate 10 to the outside of the light-receiving surface S1. Therefore, the solar cell module 1 can reduce the amount of sand particles and other debris contained in the liquid that would otherwise remain on the light-receiving surface S1 and dry out, thus reducing contamination of the light-receiving surface S1.

[0074] The surface S5 of the back material 50 has a second uneven surface 53 which includes alternately arranged second protrusions 51 and second recesses 52. The solar cell module 1 can achieve an anchoring effect between the second sealing material 40 and the back material 50 by filling the gap between a pair of adjacent second protrusions 51 in the second uneven surface 53 with the second sealing material 40 and hardening it.

[0075] The solar cell module 1 can improve the strength of the mechanical adhesion based on the second sealant 40. Therefore, even if thermal stress occurs due to differences in the coefficients of thermal expansion between the back material 50 and the second sealant 40, for example, the solar cell module 1 can reduce delamination between the layers of the back material 50 and the second sealant 40. The solar cell module 1 can increase the adhesive area with the multiple second protrusions 51 of the second uneven portion 53, making it more difficult for the second sealant 40 to peel off.

[0076] The first protrusion 11 and the first recess 12 are arranged alternately at a constant period. The first protrusion 11 has a first flat portion 111 at its top. The first recess 12 has a second flat portion 122 located at its bottom. By having the first flat portion 111 and the second flat portion 122 as described above, the solar cell module 1 can give the first protrusion 11 a certain thickness. Therefore, the solar cell module 1 can improve the mechanical strength of the first protrusion 11. As a result, the solar cell module 1 can reduce wear on the first protrusion 11 even when exposed to the natural environment. Consequently, the solar cell module 1 can maintain the anti-glare effect it provides for a longer period of time.

[0077] For light L1 incident along the short axis D2 at an incident angle of 85°, the height H of the first protrusion 11 and the width L of the first recess 12 along the short axis D2 satisfy the relationship (L / H) ≤ 45.72. As a result, the solar cell module 1 can also block the reflected light L2 of light L1 incident on the first recess 13 at an incident angle of 85° or more by positioning the short axis D2 of the translucent substrate 10 of the solar cell module 1 along the path of the reflected light L2 of sunlight with the first protrusion 11. Therefore, the solar cell module 1 can reduce the reflected light L2 that is directed directly from the translucent substrate 10 towards the subject by 50% or less. Thus, the solar cell module 1 can reduce the glare caused to the subject by the reflected light L2.

[0078] For example, the reflectivity of glass increases exponentially as the angle of incidence of light L1 increases. When the angle of incidence of light L1 exceeds 85°, the reflectivity of glass rapidly approaches the value corresponding to total internal reflection. When totally reflected sunlight enters the field of view of an object, the object experiences discomfort due to the intense glare and is also dazzled by the reflected light L2, making it difficult to see surrounding objects to observe. As a result, the object may have difficulty distinguishing traffic signs, for example, when driving a vehicle. A solar cell module 1 according to one embodiment of this disclosure can mitigate such traffic disruptions.

[0079] The width of the first flat portion 111 along the short axis D2 is narrower than the width of the second flat portion 122 along the short axis D2. This allows the solar cell module 1 to reduce the amount of reflected light L2. Therefore, the solar cell module 1 can further reduce glare to the target. As described above, for example, it is assumed that the reflected light L2 reflected by the second flat portion 122 is blocked by the first protrusion 11 and changes its reflection direction. Therefore, if the width of the second flat portion 122 is wider than the width of the first flat portion 111, glare is less likely to occur to the target who is in the specular reflection direction of the light-receiving surface S1.

[0080] The first raised portion 14 includes a dome-shaped protrusion. As a result, the solar cell module 1 can achieve diffuse reflection for light L1 with a small incident angle by the first raised structure 15, as described above.

[0081] It will be apparent to those skilled in the art that this disclosure can be implemented in other predetermined forms besides the embodiments described above without deviating from its spirit or essential features. Therefore, the prior description is illustrative and not limiting. The scope of the disclosure is defined not by the prior description but by the added claims. Any modifications within their equivalent scope are included therein.

[0082] For example, the shape, pattern, size, arrangement, orientation, type, and number of each component described above are not limited to those shown in the above description and drawings. The shape, pattern, size, arrangement, orientation, type, and number of each component may be configured arbitrarily as long as they can realize their function. Each component of the illustrated solar cell module 1 is a functional concept, and the specific form of each component is not limited to those shown.

[0083] In the above embodiment, the area of ​​the region where the first raised structure 15 is located is described as being more than half of the surface area of ​​the first uneven portion 13, but it is not limited to this. The area of ​​the region where the first raised structure 15 is located may be less than half of the surface area of ​​the first uneven portion 13.

[0084] In the above embodiment, the back surface S3 of the translucent substrate 10 was described as having a second raised structure 17 which is more finely constructed than the first uneven surface 13, with a plurality of densely packed second raised portions 16 arranged therein. However, the embodiment is not limited to this. The back surface S3 of the translucent substrate 10 does not have to have the second raised structure 17.

[0085] In the above embodiment, the side surface S4 of the translucent substrate 10 was described as having a third raised structure 19 which is more finely composed than the first uneven surface 13, with a plurality of densely packed third raised portions 18 arranged therein. However, the embodiment is not limited to this. The side surface S4 of the translucent substrate 10 does not have to have the third raised structure 19.

[0086] In the above embodiment, the side surface S4 of the translucent substrate 10 was described as having a smoothly formed machined surface S41 at the corner, but it is not limited to this. The side surface S4 does not have to have a machined surface S41.

[0087] In the above embodiment, the machined surface S41 was described as being formed by, for example, chamfering the corner of the side surface S4 to create a smooth inclined surface, but it is not limited to this. The machined surface S41 may also be formed by other chamfering processes different from chamfering, such as a C-surface or an R-surface.

[0088] In the above embodiment, the third raised structure 19 was described as being located only on the edge surface S42 of the side surface S4, but is not limited to this. The third raised structure 19 may be located on the machined surface S41 on the side surface S4, either in place of or in addition to the edge surface S42.

[0089] In the above embodiment, the translucent substrate 10 was described as having compressive residual stress near the light-receiving surface S1 and the back surface S3 in the thickness direction, and tensile residual stress in the central part, but it is not limited to this. The translucent substrate 10 does not have to be made of tempered glass.

[0090] In the above embodiment, the frame 60 was described as having a notched groove 67, but it is not limited to this. The frame 60 does not have to have a notched groove 67.

[0091] In the above embodiment, the surface S5 of the backing material 50 was described as having a second uneven surface 53 including alternately arranged second protrusions 51 and second recesses 52, but it is not limited to this. The surface S5 of the backing material 50 does not have to have the second uneven surface 53.

[0092] In the above embodiment, the first protrusions 11 and the first recesses 12 are described as being arranged alternately at a fixed period, but this is not limited to this. The first protrusions 11 and the first recesses 12 do not have to be arranged alternately at a fixed period. For example, the first protrusions 11 and the first recesses 12 may be arranged irregularly.

[0093] In the above embodiment, the first projection 11 was described as having a first flat portion 111 at its top, but it is not limited to this. The first projection 11 does not have to have a flat portion at its top. For example, the first projection 11 may be configured so that its top includes a curved surface.

[0094] In the above embodiment, the first recessed portion 12 was described as having an inclined portion 121 that slopes from the first flat portion 111 on the light-receiving surface S1, but it is not limited to this. The first recessed portion 12 does not have to have an inclined portion 121. The first recessed portion 12 was described as having a second flat portion 122 located at its bottom, but it is not limited to this. The second recessed portion 12 does not have to have a flat portion at its bottom. For example, the second recessed portion 12 may be configured so that its bottom includes a curved surface. The first recessed portion 12 was described as being demarcated by a first protrusion 11, but it is not limited to this. The first recessed portion 12 does not have to be demarcated by a first protrusion 11.

[0095] In the above embodiment, it was explained that the first recessed portion 12, which is demarcated by the first flat portion 111 in a plan view of the light-receiving surface S1, has mutually orthogonal longitudinal axes D1 and transverse longitudinal axes D2, but this is not limited to this. The first recessed portion 12 does not have to have mutually orthogonal longitudinal axes D1 and transverse longitudinal axes D2. For example, the first recessed portion 12 may have mutually non-orthogonal longitudinal axes D1 and transverse longitudinal axes D2, or it may be configured symmetrically without having longitudinal axes D1 and transverse axes D2 at all.

[0096] In the above embodiment, it was explained that, with respect to light L1 incident along the short axis D2 at an incident angle of 85°, the height H of the first protrusion 11 and the width L of the first recess 12 along the short axis D2 satisfy the relationship (L / H) ≤ 45.72, but the embodiment is not limited to this. The height H and width L may satisfy a different relationship than the one described above.

[0097] In the above embodiment, the width of the first flat portion 111 along the short axis D2 was described as being narrower than the width of the second flat portion 122 along the short axis D2, but this is not limited to this. The width of the first flat portion 111 along the short axis D2 may be the same as the width of the second flat portion 122 along the short axis D2, or it may be wider than the width of the second flat portion 122 along the short axis D2.

[0098] In the above embodiment, the first raised portion 14 was described as including a dome-shaped raised portion, but it is not limited to this. The first raised portion 14 may include raised portions of other shapes other than a dome shape.

[0099] Some embodiments of the present disclosure are described below. However, it should be noted that the embodiments of the present disclosure are not limited to these. [Note 1] Solar cell module, The solar cell module includes a light-receiving surface and comprises a light-transmitting substrate made of patterned glass, The light-receiving surface of the light-transmitting substrate is A first uneven portion including first protruding portions and first recessed portions arranged alternately, A plurality of densely packed first ridges are arranged on the first surface of the first uneven portion, and a first ridge structure is formed that is finer than the first uneven portion, Having Solar cell module. [Note 2] The solar cell module described in Appendix 1, The area of ​​the region where the first raised structure is located is more than half of the surface area of ​​the first surface. Solar cell module. [Note 3] A solar cell module as described in Appendix 1 or 2, The light-transmitting substrate further comprises a first sealing material that adheres the first back surface located on the opposite side of the light-receiving surface to the solar cell, The first back surface has a second raised structure which is more finely composed than the first uneven surface, with a plurality of densely packed second raised portions arranged therein. Solar cell module. [Note 4] A solar cell module described in any one of the appendices 1 to 3, A frame that protects the side surface connecting the light-receiving surface and the first back surface located on the opposite side of the light-receiving surface in the light-transmitting substrate, An adhesive for bonding the aforementioned side surface and the aforementioned frame, Furthermore, The aforementioned side surface has a third raised structure which is composed of a plurality of densely packed third raised portions and is more finely structured than the first uneven portion. Solar cell module. [Note 5] The solar cell module described in Appendix 4, The aforementioned side surface has a machined surface that is smoothly formed at the corner and an edge surface that is continuous with the machined surface. The third raised structure is located only on the edge surface. Solar cell module. [Note 6] A solar cell module as described in Appendix 4 or 5, The frame is fixed to surround the translucent substrate with its inner surface facing the side surface, and has a notched groove in the top plate portion facing the light-receiving surface that extends from the inner circumference to the outer circumference of the frame and extends continuously to the side plate portion of the frame. Solar cell module. [Note 7] A solar cell module described in any one of the appendices 1 to 6, The solar cell module includes a second back surface located on the opposite side of the light-receiving surface, and the back surface material is made of patterned glass, A second sealing material is provided to bond the second surface located on the opposite side of the second back surface of the back material to the solar cell, Furthermore, The second surface of the back material has a second uneven surface including alternately arranged second protrusions and second recesses. Solar cell module. [Note 8] A solar cell module described in any one of the appendices 1 to 7, The first protrusion and the first recess are arranged alternately at a constant period. The first projection has a first flat portion at its top, The first recessed portion has an inclined portion that slopes from the first flat portion on the light-receiving surface, and a second flat portion connected to the inclined portion and located at the bottom, and is partitioned by the first protrusion. Solar cell module. [Note 9] The solar cell module described in Appendix 8, In a plan view of the light-receiving surface, the first recessed portion, which is demarcated by the first flat portion, has a first axis and a second axis that are orthogonal to each other, and with respect to light incident at an incident angle of 85° along either of the first and second axes which have the same length or which is the shorter axis, the height H of the first protrusion and the width L of the first recessed portion along one axis satisfy the relationship (L / H) ≤ 45.72. Solar cell module. [Note 10] The solar cell module described in Appendix 9, The width of the first flat portion along one of the axes is narrower than the width of the second flat portion along one of the axes. Solar cell module. [Note 11] A solar cell module described in any one of the appendices 1 to 10, The first raised portion includes a dome-shaped protrusion. Solar cell module. [Explanation of symbols]

[0100] 1. Solar cell module 10 Translucent substrate 11 First protrusion 111 1st flat part 12 First recess 121 Slope 122 2nd flat part 13 First uneven part 14 1st protuberance 15 1st raised structure 16 Second bulge 17 Second raised structure 18 Third protuberance 19 Third raised structure 20. First sealing material 30 solar cells 40. Second sealing material 50 Backing material 51 Second protrusion 52 Second recess 53 Second uneven part 60 frames 61 Mounting part 62 Top panel 63 Side plate part 64 Installation section 65 Hollow part 66 screw holes 67 Notched groove 70 Other frames 80 Adhesives D1 Long axis D2 short axis L1 light L2 reflected light R region S1 Photosensitive surface S2 Reverse side (Second reverse side) S3 Reverse side (First reverse side) S4 side S41 Machining surface S42 Edge S5 surface (second surface) d1, d2, d3, d4, d5 width H Height L width

Claims

1. Solar cell module, The solar cell module includes a light-receiving surface and comprises a light-transmitting substrate made of patterned glass, The light-receiving surface of the light-transmitting substrate is A first uneven portion including first protruding portions and first recessed portions arranged alternately, A plurality of densely packed first ridges are arranged on the first surface of the first uneven portion, and a first ridge structure is formed that is finer than the first uneven portion, Having Solar cell module.

2. A solar cell module according to claim 1, The area of ​​the region where the first raised structure is located is more than half of the surface area of ​​the first surface. Solar cell module.

3. A solar cell module according to claim 1, The light-transmitting substrate further comprises a first sealing material that adheres the first back surface located on the opposite side of the light-receiving surface to the solar cell, The first back surface has a second raised structure which is more finely composed than the first uneven surface, with a plurality of densely packed second raised portions arranged therein. Solar cell module.

4. A solar cell module according to any one of claims 1 to 3, A frame that protects the side surface connecting the light-receiving surface and the first back surface located on the opposite side of the light-receiving surface in the light-transmitting substrate, An adhesive for bonding the aforementioned side surface and the aforementioned frame, Furthermore, The aforementioned side surface has a third raised structure which is composed of a plurality of densely packed third raised portions and is more finely formed than the first uneven portion. Solar cell module.

5. A solar cell module according to claim 4, The aforementioned side surface has a machined surface that is smoothly formed at the corner and an edge surface that is continuous with the machined surface. The third raised structure is located only on the edge surface. Solar cell module.

6. A solar cell module according to claim 4, The frame is fixed to surround the translucent substrate with its inner surface facing the side surface, and has a notched groove in the top plate portion facing the light-receiving surface that extends from the inner circumference to the outer circumference of the frame and extends continuously to the side plate portion of the frame. Solar cell module.

7. A solar cell module according to any one of claims 1 to 3, The solar cell module includes a second back surface located on the opposite side of the light-receiving surface, and the back surface material is made of patterned glass, A second sealing material is provided to bond the second surface located on the opposite side of the second back surface of the back material to the solar cell, Furthermore, The second surface of the back material has a second uneven surface including alternately arranged second protrusions and second recesses. Solar cell module.

8. A solar cell module according to any one of claims 1 to 3, The first protrusion and the first recess are arranged alternately at a constant period. The first projection has a first flat portion at its top, The first recessed portion has an inclined portion that slopes from the first flat portion on the light-receiving surface, and a second flat portion connected to the inclined portion and located at the bottom, and is partitioned by the first protrusion. Solar cell module.

9. A solar cell module according to claim 8, In a plan view of the light-receiving surface, the first recessed portion, which is demarcated by the first flat portion, has a first axis and a second axis that are orthogonal to each other, and with respect to light incident at an incident angle of 85° along either of the first and second axes which have the same length or which is the shorter axis, the height H of the first protrusion and the width L of the first recessed portion along one axis satisfy the relationship (L / H) ≤ 45.

72. Solar cell module.

10. A solar cell module according to claim 9, The width of the first flat portion along one of the axes is narrower than the width of the second flat portion along one of the axes. Solar cell module.

11. A solar cell module according to any one of claims 1 to 3, The first raised portion includes a dome-shaped protrusion, Solar cell module.

Images