Solar cell module

Abstract

To provide a solar cell module with excellent designability, in which a wiring member is less visible when seen from a light-receiving surface side compared to before.SOLUTION: A solar cell module includes a solar cell string having a first main surface as a light-receiving surface and including at least one solar cell, a wiring member that extracts power from the solar cell string to the outside, and a light-receiving side sealing member that covers a light-receiving surface side of the solar cell string. The wiring member includes a first wiring part extending along an edge of the solar cell string in a plan view from the light-receiving surface. The light-receiving side sealing member includes a first light-receiving side sealing material, a second light-receiving side sealing material, a light-receiving side sealing substrate, and a wiring shielding member. The first light-receiving side sealing material and the second light-receiving side sealing material are disposed between the solar cell string and the light-receiving side sealing substrate. The wiring shielding member exists between the first light-receiving side sealing material and the second light-receiving side sealing material. The wiring shielding member surrounds the solar cell string in the plan view from the light-receiving surface and partially overlaps with the first wiring part.SELECTED DRAWING: Figure 6

Description

Technical Field

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

Background Art

[0002] In recent years, solar cell modules have been used not only on roofs but also on balcony handrails (for example, Patent Document 1). For example, the balcony with a solar cell of Patent Document 1 includes a waist wall erected on the upper side of the outer peripheral beam of the balcony floor, a solar cell panel erected on the upper side of this waist wall, and a covering panel erected on the upper side of the waist wall so as to cover the back side of this solar cell panel, and a coping provided so as to straddle between the upper end portions of the solar cell panel and the covering panel, and it is possible to run wiring between the solar cell panel and the covering panel.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, inside a solar cell module (corresponding to the solar cell panel of Patent Document 1), a solar cell string in which a plurality of solar cells are electrically connected is provided, and power generation is performed by each solar cell constituting the solar cell string. In order to extract the electric power generated by this solar cell string to the outside of the solar cell module, a wiring member is connected to the solar cell string and taken out to the outside. However, the wiring member of a general solar cell module is visible from the light-receiving surface side. Although it is a thin wire, it has a metallic luster and is smooth. Therefore, when light such as sunlight hits the light-receiving surface of the solar cell module installed on the balcony as in Patent Document 1, the incident light of the sunlight is specularly reflected by the internal wiring member, and even a thin wire may become conspicuous.

[0005] Therefore, an object of the present invention is to provide a solar cell module in which the wiring member is less conspicuous and has good design properties when viewed from the light-receiving surface side as compared with the prior art.

Means for Solving the Problems

[0006] One aspect of the present invention for solving the above problems is a solar cell module having a first main surface as a light-receiving surface, a solar cell string having at least one solar cell, a wiring member for extracting electric power from the solar cell string to the outside, and a light-receiving side sealing member covering the light-receiving surface side of the solar cell string, wherein the wiring member has a first wiring portion extending along the edge of the solar cell string when viewed in plan from the light-receiving surface side, the light-receiving side sealing member has a first light-receiving side sealing material, a second light-receiving side sealing material, a light-receiving side sealing substrate, and a wiring shielding member, the first light-receiving side sealing material and the second light-receiving side sealing material are disposed between the solar cell string and the light-receiving side sealing substrate, the wiring shielding member is interposed between the first light-receiving side sealing material and the second light-receiving side sealing material, and the wiring shielding member surrounds the solar cell string and partially overlaps the first wiring portion when viewed in plan from the light-receiving surface side.

[0007] According to this aspect, since the first wiring portion of the wiring member is hidden by the wiring shielding member, the first wiring portion of the wiring member is difficult to see and is inconspicuous when viewed from the light-receiving surface side. Therefore, the design properties are improved as compared with the prior art.

[0008] A preferred aspect is that the first wiring portion is hidden by the wiring shielding member and is not visible when viewed from the light-receiving surface side.

[0009] According to this aspect, since the first wiring portion is hidden by the wiring shielding member and is not visible, the design property becomes better.

[0010] A preferred aspect is that the wiring shielding member is colored.

[0011] The term "colored" as used herein refers to a color other than colorless and transparent (i.e., colorless in the narrow sense), and includes not only chromatic colors but also achromatic colors such as white, gray, and black, and also includes cases where color is developed by light scattering or light interference when light is incident even if it is colorless. The same shall apply hereinafter.

[0012] According to this aspect, it is possible to make the first wiring portion less visible.

[0013] A preferred aspect has a backside sealing member that covers the backside of the solar cell string, the backside sealing member has a backside sealing substrate and a backside sealing material interposed between the backside sealing substrate and the solar cell string, and the backside sealing material is colored and has the same color as or a color close to that of the wiring shielding member.

[0014] The term "color close to" as used herein means that the color difference is 5.0 or less in the CIE1976L*a*b* color space according to JIS Z 8781-4:2013.

[0015] According to this aspect, since the backside sealing material and the wiring shielding member have the same color or a color close to each other, the wiring shielding member is less conspicuous when viewed from the light-receiving surface side, and the design property becomes better.

[0016] A preferred aspect is that the wiring shielding member has irregularities formed at least on the surface on the light-receiving surface side.

[0017] According to this aspect, light is less likely to be specularly reflected on the surface on the light-receiving surface side of the wiring shielding member, and glare is less likely to occur on the surface on the light-receiving surface side of the wiring shielding member when viewed from the light-receiving surface side.

[0018] A preferred aspect is that the light-receiving side sealing substrate has irregularities with a height of 0.1 μm or more and 10 μm or less formed on the surface on the light-receiving surface side.

[0019] According to this aspect, since fine surface irregularities are formed on the surface on the light-receiving surface side of the light-receiving side sealing substrate, an antiglare function can be imparted.

[0020] A preferred aspect is that the light-receiving side sealing substrate has a colored coating layer formed on the surface on the solar cell string side.

[0021] According to this aspect, by adjusting the color of the coating layer, the color of the solar cell module in terms of appearance can be controlled by the color of the coating layer.

[0022] A preferred aspect is that the wiring shielding member overlaps a part of the solar cell string when viewed from the light-receiving surface side.

[0023] According to this aspect, since no gap is formed between the solar cell string and the wiring shielding member when viewed from the light-receiving surface side, the design property is good.

[0024] A preferred aspect is that the wiring shielding member overlaps along the edge of the solar cell string when viewed from the light-receiving surface side, and the overlapping width of the wiring shielding member with the solar cell string is more than 0 mm and 5 mm or less.

[0025] According to this aspect, the wiring shielding member does not overlap the solar cell string too much, and a decrease in the power generation amount of the solar cell string due to the wiring shielding member can be suppressed.

[0026] A preferred aspect is that the first wiring portion has an overlapping wiring portion connected to the solar cell string on the light-receiving surface side of the solar cell string, and the wiring shielding member overlaps the entire overlapping wiring portion when viewed from the light-receiving surface side.

[0027] According to this aspect, since the overlapping wiring portion connected to the solar cell string on the light-receiving surface side can be hidden by the wiring shielding member, it is easy to extract power from the solar cell string, and the design property is also improved.

[0028] A preferred aspect is that the wiring shielding member is buried between the first light-receiving side sealing material and the second light-receiving side sealing material, and most of the first light-receiving side sealing material is in surface contact with the second light-receiving side sealing material.

[0029] The "most part" mentioned here refers to a part exceeding 50 percent of the whole.

[0030] According to this aspect, since the wiring shielding member is sandwiched and buried by the first light-receiving side sealing material and the second light-receiving side sealing material, the thickness of the wiring shielding member is absorbed by the first light-receiving side sealing material and / or the second light-receiving side sealing material, and it is difficult for steps or inclinations due to the thickness of the wiring shielding member to occur, and the sealing property is improved.

Effect of the Invention

[0031] According to the solar cell module of the present invention, compared with the conventional one, the wiring member is less conspicuous when viewed from the light-receiving surface side, and the design property is good.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0033] Hereinafter, embodiments of the present invention will be described in detail.

[0034] The solar cell module 1 of the first embodiment of the present invention is mainly suitable for use on a balcony railing or the like. As shown in FIGS. 1 and 3, the solar cell module 1 is a plate-shaped panel having a first main surface as a light-receiving surface 2 and a second main surface as a back surface 3. As shown in FIGS. 1 and 2, the solar cell module 1 includes a light-receiving side sealing member 5, solar cell strings 6 (6a to 6f), a wiring member 7, and a back surface side sealing member 8. The solar cell strings 6 and the wiring member 7 are sandwiched and sealed by the light-receiving side sealing member 5 and the back surface side sealing member 8. Then, when light is incident on the light-receiving surface 2 of the solar cell module 1, power can be generated by the internal solar cell strings 6. The solar cell module 1 of the present embodiment has a main feature in that a wiring shielding member 13 is provided on the light-receiving side sealing member 5, and a part or all of the wiring member 7 is hidden by the wiring shielding member 13.

[0035] (Light-receiving side sealing member 5) 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. 4, includes a first light-receiving side sealing material 10, a second light-receiving side sealing material 11, a light-receiving side sealing substrate 12, and a wiring shielding member 13.

[0036] The first light-receiving side sealing material 10 is a translucent insulating sealing material having sealing properties, insulating properties, and translucency, and is an adhesive material that adheres between the solar cell string 6 and the wiring member 7 and the second light-receiving side sealing material 11. The first light-receiving side sealing material 10 has elasticity and can be deformed along the solar cell string 6 and the wiring member 7 to bury a part of the solar cell string 6 and the wiring member 7. The first light-receiving side sealing material 10 is not particularly limited as long as it has sealing properties, insulating properties, and translucency. For example, a resin sealing material such as a polyolefin elastomer can be used.

[0037] The second light-receiving side sealing material 11 is a translucent insulating sealing material having sealing properties, insulating properties, and translucency, and is an adhesive material that adheres between the first light-receiving side sealing material 10 and the light-receiving side sealing substrate 12. The second light-receiving side sealing material 11 is not particularly limited as long as it has sealing properties, insulating properties, and translucency. For example, a resin sealing material such as a polyolefin elastomer can be used.

[0038] The light-receiving side sealing substrate 12 is a translucent insulating substrate having sealing properties, insulating properties, and translucency, and is a member that constitutes the light-receiving surface 2. The light-receiving side sealing substrate 12 is not particularly limited as long as it has sealing properties, insulating properties, and translucency. For example, a glass substrate such as float glass or colored glass can be used. The light-receiving side sealing substrate 12 of the present embodiment is, as shown in FIG. 4, an antiglare glass having irregularities 15 formed on a part or all of the surface on the light-receiving surface 2 side, and is also a colored glass having a coated layer 16 colored on the surface on the back surface 3 side. From the perspective of allowing light to enter the side of the solar cell string 6 while exhibiting an anti-glare function, the arithmetic mean roughness of the region where the unevenness 15 is formed on the surface on the light-receiving surface 2 side shown in FIG. 4 of the light-receiving side sealing substrate 12 is preferably 0.1 μm or more and 10 μm or less, and more preferably 1 μm or more and 8 μm or less.

[0039] The coating layer 16 is a translucent colored layer that is colored while having translucency. The color of the coating layer 16 is not particularly limited, and for example, dark colors such as gray and black can be used. The coating layer 16 of the present embodiment is composed of a multilayer film in which films with different refractive indices and generally transparent films overlap, and the reflected light at the interface between the films interferes due to the difference in refractive indices to generate color.

[0040] The wiring shielding member 13 is a member that hides a part of the wiring member 7 when viewed from the light-receiving surface 2 side. The wiring shielding member 13 is colored and is a non-translucent member that substantially has no translucency, and is preferably a black and opaque sealing material. "Substantially having no translucency" as used herein means that the light transmittance in the thickness direction is 3% or less. The same applies hereinafter.

[0041] As shown in FIG. 5, the wiring shielding member 13 preferably has unevenness 18 formed on the surface on the light-receiving surface 2 side, and more preferably also has unevenness 19 formed on the surface on the back surface 3 side. From the perspective of imparting an anti-glare function and enhancing the adhesion with the second light-receiving side sealing material 11, the arithmetic mean roughness of the surface on the light-receiving surface 2 side of the wiring shielding member 13 is preferably 0.1 μm or more and 1.2 μm or less. From the perspective of enhancing the adhesion with the first light-receiving side sealing material 10, the arithmetic mean roughness of the surface on the back surface 3 side of the wiring shielding member 13 is preferably 0.1 μm or more and 1.2 μm or less.

[0042] As shown in FIG. 6, the wiring shielding member 13 is a square annular member provided so as to surround the solar cell string 6 when viewed from the light-receiving surface 2 side. As shown in Fig. 5, the wiring shielding member 13 includes lateral shielding portions 20 and 21 (first shielding portions) and longitudinal shielding portions 22 and 23 (second shielding portions), and the shielding portions 20 to 23 are connected by ultrasonic welding.

[0043] As shown in Fig. 6, the lateral shielding portions 20 and 21 are portions that have a width in the longitudinal direction Y and extend linearly in the lateral direction X (the juxtaposition direction of the solar cell strings 6), and are parallel to each other with the solar cell strings 6 interposed therebetween when viewed in plan from the light-receiving surface 2 side. The longitudinal shielding portions 22 and 23 are portions that have a width in the lateral direction X and extend linearly in the longitudinal direction Y, and are parallel to each other with the solar cell strings 6 interposed therebetween when viewed in plan from the light-receiving surface 2 side.

[0044] When viewed in plan from the light-receiving surface 2 side, one end of the lateral shielding portions 20 and 21 overlaps beyond the edge of the longitudinal shielding portion 22 in the lateral direction X, and overlapping portions 25 and 26 are formed, and the other end overlaps beyond the edge of the longitudinal shielding portion 23 in the lateral direction X, and overlapping portions 27 and 28 are formed. That is, the overlapping portions 25 and 26 are portions where the lateral shielding portions 20 and 21 and the longitudinal shielding portion 22 overlap in the thickness direction, respectively, and the overlapping portions 27 and 28 are portions where the lateral shielding portions 20 and 21 and the longitudinal shielding portion 23 overlap in the thickness direction, respectively. The overlapping portions 25 to 28 have a width in the lateral direction X and extend in the longitudinal direction Y (a predetermined direction).

[0045] The width W1 of each of the overlapping portions 25 to 28 shown in Fig. 7 (the overlapping width between the shielding portions 20 and 21 and the shielding portions 22 and 23, the overhanging width of the lateral shielding portions 20 and 21 with respect to the longitudinal shielding portions 22 and 23) is preferably 1 mm or more, and more preferably 3 mm or more. The width W1 of each of the overlapping portions 25 to 28 shown in Fig. 7 is preferably 1 cm or less, and more preferably 5 mm or less.

[0046] As shown in FIGS. 5 to 7, the first overlapping portion 25 includes a plurality of first welding portions 30 (30a to 30c) that bond the lateral shielding portion 20 and the longitudinal shielding portion 22, and the second overlapping portion 26 includes a plurality of second welding portions 31 (31a to 31c) that bond the lateral shielding portion 21 and the longitudinal shielding portion 22. The third overlapping portion 27 includes a plurality of third welding portions 32 (32a to 32c) that bond the lateral shielding portion 20 and the longitudinal shielding portion 23, and the fourth overlapping portion 28 includes a plurality of fourth welding portions 33 (33a to 33c) that bond the lateral shielding portion 21 and the longitudinal shielding portion 23.

[0047] The welding portions 30 to 33 are formed by ultrasonic welding of the shielding portions 20, 21 on the distal side (the back surface 3 side) and the shielding portions 22, 23 on the proximal side (the light receiving surface 2 side) with respect to the light receiving side sealing substrate 12, and there is substantially no joint interface between the shielding portions 20, 21 on the distal side and the shielding portions 22, 23 on the proximal side. The welding portions 30 to 33 of the present embodiment are formed by pressing a horn from the shielding portions 20, 21 on the distal side (the back surface 3 side) toward the shielding portions 22, 23 on the proximal side (the light receiving surface 2 side) with respect to the light receiving side sealing substrate 12, applying pressure, and transmitting ultrasonic waves. Therefore, with respect to the welding portions 30 to 33, the surface on the light receiving surface 2 side of the shielding portions 22, 23 on the proximal side is a smooth surface or has a surface roughness comparable to other portions of the surface on the light receiving surface 2 side, while recesses 35 are formed on the back surface 3 side of the shielding portions 20, 21 on the distal side as shown in FIG. 5.

[0048] In the first overlapping portion 25, the first welding portions 30a to 30c are arranged linearly at intervals in the longitudinal direction Y, and there are portions that are not welded between the first welding portions 30a to 30c. Similarly, in the second overlapping portion 26, the second welding portions 31a to 31c are arranged linearly at intervals in the longitudinal direction Y, and there are portions that are not welded between the second welding portions 31a to 31c. In the third overlapping portion 27, the third welding portions 32a to 32c are arranged linearly at intervals in the vertical direction Y, and there are portions between the third welding portions 32a to 32c that are not welded. Similarly, in the fourth overlapping portion 28, the fourth welding portions 33a to 33c are arranged linearly at intervals in the vertical direction Y, and there are portions between the fourth welding portions 33a to 33c that are not welded.

[0049] (Solar cell string 6) As shown in FIG. 3, the solar cell string 6 is formed by electrically connecting one or more solar cells 40 directly or via a conductive adhesive 41 in series. The solar cell 40 is provided with a negative terminal portion 42 on one main surface and a positive terminal portion 43 on the other main surface. Further, the solar cell 40 is a small piece panel having a rectangular shape with two opposing sides 44 and 45 in plan view. The negative terminal portion 42 is provided along side 44 in the vicinity of side 44, and the positive terminal portion 43 is provided along side 45 in the vicinity of side 45 opposite to side 44. In the solar cell string 6 of the present embodiment, the negative terminal portion 42 and the positive terminal portion 43 are connected with an overlapping portion between adjacent solar cells 40 and 40 (so-called, singling connection).

[0050] The conductive adhesive 41 is a conductive member having conductivity and is an adhesive for connecting between the terminal portions 42 and 43 of adjacent solar cells 40 and 40. The conductive adhesive 41 of the present embodiment is a conductive paste.

[0051] (Wiring member 7) The wiring member 7 is a member for taking out electric power from each solar cell string 6 to the outside. As shown in FIG. 8, the wiring member 7 includes extraction wiring portions 50a to 50c and a connection wiring portion 51.

[0052] As shown in FIG. 8, the first extraction wiring portion 50a is a "C" - shaped portion when viewed in plan from the light - receiving surface 2 side, and includes a lateral wiring portion 55 and longitudinal wiring portions 56 and 57. The horizontal wiring portion 55 is wiring that extends linearly in the horizontal direction X (the direction in which the solar cell strings 6 are arranged side by side). The vertical wiring portions 56 and 57 are wiring that extends in the vertical direction Y (the direction orthogonal to the extending direction of the horizontal wiring portion 55) from both end portions in the extending direction of the horizontal wiring portion 55.

[0053] As shown in FIG. 8, the second extraction wiring portion 50b is an “L”-shaped portion when viewed in plan from the light-receiving surface 2 side, and includes a horizontal wiring portion 60 and a vertical wiring portion 61. The horizontal wiring portion 60 is wiring that extends linearly in the horizontal direction X (the direction in which the solar cell strings 6 are arranged side by side), and is parallel to the horizontal wiring portion 55 with the solar cell string 6 interposed therebetween when viewed in plan from the light-receiving surface 2 side. The vertical wiring portion 61 is wiring that extends in the vertical direction Y (the direction orthogonal to the extending direction of the horizontal wiring portion 60) from one end portion in the extending direction of the horizontal wiring portion 60 toward the vertical wiring portion 56. The vertical wiring portion 61 is arranged in a straight line at an interval from the vertical wiring portion 56 in the vertical direction Y.

[0054] As shown in FIG. 8, the third extraction wiring portion 50c is an “L”-shaped portion when viewed in plan from the light-receiving surface 2 side, and includes a horizontal wiring portion 65 and a vertical wiring portion 66. The horizontal wiring portion 65 is wiring that extends linearly in the horizontal direction X (the direction in which the solar cell strings 6 are arranged side by side), and is parallel to the horizontal wiring portion 55 with the solar cell string 6 interposed therebetween when viewed in plan from the light-receiving surface 2 side. The horizontal wiring portion 65 is arranged in a straight line at an interval from the horizontal wiring portion 60 in the horizontal direction X. The vertical wiring portion 66 is wiring that extends in the vertical direction Y from the other end portion in the extending direction of the horizontal wiring portion 65 toward the vertical wiring portion 57, and extends in the same direction as the vertical wiring portion 61. The vertical wiring portion 66 is arranged in a straight line at an interval from the vertical wiring portion 57 in the vertical direction Y.

[0055] The connection wiring part 51 is wiring that connects each extraction wiring part 50a to 50c and each solar cell string 6. As shown in FIG. 8, the connection wiring part 51 is ladder-shaped wiring in a plan view, and includes a battery-side terminal part 70, an extraction-side terminal part 71, and a terminal connection part 72. The battery-side terminal part 70 extends in the lateral direction X and is a part connected to the negative terminal part 42 of the solar cell 40 located at the downstream end of the current flow directions C1 and C2 of the solar cell string 6, or the positive terminal part 43 of the solar cell 40 located at the upstream end. The extraction-side terminal part 71 extends in the lateral direction X and is a part connected to the lateral wiring parts 55, 60, and 65 of the extraction wiring parts 50a to 50c. The terminal connection part 72 extends in the longitudinal direction Y and is a part that connects the battery-side terminal part 70 and the extraction-side terminal part 71.

[0056] (Back-side sealing member 8) As shown in FIG. 2, the back-side sealing member 8 covers the back surface 3 side of the solar cell string 6, and includes a first back-side sealing material 80, a second back-side sealing material 81, a back-side sealing substrate 82, and a wiring extraction hole (not shown).

[0057] The first back-side sealing material 80 is an insulating sealing material having sealing properties and insulating properties, and as shown in FIG. 3, is an adhesive material that adheres between the solar cell string 6 and the wiring member 7 and the second back-side sealing material 81. The first back-side sealing material 80 has elasticity and can be deformed along the solar cell string 6 and the wiring member 7 to bury the solar cell string 6 and the wiring member 7 together with the first light-receiving side sealing material 10. The first back-side sealing material 80 is not particularly limited as long as it has sealing properties and insulating properties. For example, a resin sealing material such as a polyolefin elastomer can be used.

[0058] The second back-side sealing material 81 is an insulating sealing material having sealing properties and insulating properties, and as shown in FIG. 3, is an adhesive material that adheres between the first back-side sealing material 80 and the back-side sealing substrate 82. The second backside sealing material 81 is not particularly limited as long as it has sealing properties and insulating properties. For example, a resin sealing material such as an ionomer can be used. The second backside sealing material 81 is a colored non-translucent sealing material that is substantially non-transmissive and is preferably an opaque colored sealing material. The second backside sealing material 81 of the present embodiment is the same color as or close to the color of the wiring shielding member 13, and preferably has a color difference of 5.0 or less, more preferably 2.5 or less, and even more preferably 1.2 or less in the CIE1976L*a*b* color space according to JIS Z 8781-4:2013.

[0059] The backside sealing substrate 82 is an insulating substrate having sealing properties and insulating properties and is a member constituting the back surface 3. The backside sealing substrate 82 is not particularly limited as long as it has sealing properties and insulating properties. For example, a glass substrate such as float glass can be used.

[0060] The wiring extraction hole is an insertion hole through which a part of the wiring member 7 is inserted from the inside of the backside sealing substrate 82 to the outside of the backside sealing substrate 82 with respect to the solar cell string 6, and is a through hole penetrating the backside sealing materials 80 and 81 and the backside sealing substrate 82 in the thickness direction.

[0061] Subsequently, the positional relationship of each part of the solar cell module 1 of the present embodiment will be described.

[0062] As shown in FIG. 1, in the solar cell module 1, a plurality of solar cell strings 6 (6a to 6f) are arranged in parallel at intervals in the horizontal direction X. As shown in FIG. 6, the current flow directions C1 of the solar cell strings 6a to 6c are each directed in one direction, and the current flow directions C2 of the solar cell strings 6d to 6f are each opposite to the current flow direction C1 of the solar cell strings 6a to 6c. That is, the solar cell module 1 includes solar cell strings 6a to 6c that form a unidirectional solar cell string group in which the current flow direction C1 flows in one direction, and solar cell strings 6d to 6f that form a reverse-direction solar cell string group in which the current flow direction C2 flows in the reverse direction. In the solar cell strings 6a to 6c that form the unidirectional solar cell string group, the positive electrode terminal portion 43 is located on the upper side, and the negative electrode terminal portion 42 is located on the lower side. In the solar cell strings 6d to 6f that form the reverse-direction solar cell string group, the positive electrode terminal portion 43 is located on the lower side, and the negative electrode terminal portion 42 is located on the upper side.

[0063] As shown in FIG. 2, the wiring member 7 is provided such that the extraction wiring portions 50a to 50c surround the solar cell strings 6a to 6f in a plan view. As shown in FIG. 6, the first extraction wiring portion 50a of the wiring member 7 connects the lateral wiring portion 55 to the positive electrode terminal portions 43 of the solar cell strings 6a to 6c and the negative electrode terminal portions 42 of the solar cell strings 6d to 6f via the connection wiring portion 51 to make them at the same potential. The second extraction wiring portion 50b of the wiring member 7 connects the lateral wiring portion 60 to the negative electrode terminal portions 42 of the solar cell strings 6a to 6c via the connection wiring portion 51 to make them at the same potential. The third extraction wiring portion 50c of the wiring member 7 connects the lateral wiring portion 65 to the positive electrode terminal portions 43 of the solar cell strings 6d to 6f via the connection wiring portion 51 to make them at the same potential. The connection wiring portion 51 of the wiring member 7 has the battery-side terminal portion 70 connected to the negative electrode terminal portion 42 or the positive electrode terminal portion 43 of the corresponding solar cell string 6, and the extraction-side terminal portion 71 connected to the corresponding extraction wiring portions 50a to 50c.

[0064] As shown in FIG. 6, when viewed in a plan view from the light-receiving surface 2 side, a part of the wiring shielding member 13 overlaps the solar cell string 6 and the wiring member 7 in the solar cell module 1.

[0065] Specifically, as shown in Fig. 7(a), for the wiring shielding member 13, the lateral shielding portion 20 overlaps with the lateral wiring portion 55 of the extraction wiring portion 50a of the wiring member 7. Furthermore, for the wiring shielding member 13, the lateral shielding portion 20 also overlaps with a part of the solar cell string 6 in the vertical direction Y, and includes the battery-side terminal portion 70 (first electrode portion) located on the light-receiving surface 2 side of the solar cell strings 6d to 6f, and overlaps with the entire connection wiring portion 51. The overlapping width W2 between the lateral shielding portion 20 and the solar cell string 6 is preferably wider than the width of the battery-side terminal portion 70 and is more than 0 mm and 5 mm or less.

[0066] Also, as shown in Fig. 7(b), for the wiring shielding member 13, the lateral shielding portion 21 overlaps with the lateral wiring portions 60 and 65 of the extraction wiring portions 50b and 50c of the wiring member 7. Furthermore, for the wiring shielding member 13, the lateral shielding portion 21 also overlaps with a part of the solar cell string 6 in the vertical direction Y, and includes the battery-side terminal portion 70 (first electrode portion) located on the light-receiving surface 2 side of the solar cell strings 6a to 6c, and overlaps with the entire connection wiring portion 51. The overlapping width W3 between the lateral shielding portion 21 and the solar cell string 6 is preferably wider than the width of the battery-side terminal portion 70 and is more than 0 mm and 5 mm or less.

[0067] As shown in Fig. 7, for the wiring shielding member 13, it is preferable that the vertical shielding portions 22 overlap with the vertical wiring portions 56 and 61 of the extraction wiring portions 50a and 50b of the wiring member 7, and further overlap with a part of the solar cell string 6 in the horizontal direction X. Similarly, for the wiring shielding member 13, it is preferable that the vertical shielding portions 23 overlap with the vertical wiring portions 57 and 66 of the extraction wiring portions 50a and 50c of the wiring member 7, and further overlap with a part of the solar cell string 6 in the horizontal direction X. The overlapping width W4 between the vertical shielding portions 22 and 23 and the solar cell string 6 is preferably 0 mm or more and 3 mm or less.

[0068] As shown in FIG. 3, the wiring shielding member 13 is buried between the first light-receiving side sealing material 10 and the second light-receiving side sealing material 11, and most of the first light-receiving side sealing material 10 and the second light-receiving side sealing material 11 are in surface contact. In the present embodiment, the wiring shielding member 13 is buried in the first light-receiving side sealing material 10 due to the elastic deformation of the first light-receiving side sealing material 10.

[0069] According to the solar cell module 1 of the present embodiment, when viewed in plan from the light-receiving surface 2 side, the wiring shielding member 13 surrounds the solar cell strings 6a to 6f, and a part thereof overlaps with the extraction wiring portions 50a to 50c and the connection wiring portion 51 of the wiring member 7. That is, according to the solar cell module 1 of the present embodiment, since the extraction wiring portions 50a to 50c and the connection wiring portion 51 of the wiring member 7 are hidden by the wiring shielding member 13, the extraction wiring portions 50a to 50c and the connection wiring portion 51 of the wiring member 7 are difficult to see from the light-receiving surface 2 side and are not conspicuous. As a result, the design property is better than that of the prior art.

[0070] According to the solar cell module 1 of the present embodiment, the extraction wiring portions 50a to 50c and the connection wiring portion 51 of the wiring member 7 are hidden by the wiring shielding member 13 and are not visible when viewed from the light-receiving surface 2 side, so that the extraction wiring portions 50a to 50c and the connection wiring portion 51 are not visible, and the design property is better.

[0071] According to the solar cell module 1 of the present embodiment, since the wiring shielding member 13 is colored, the extraction wiring portions 50a to 50c and the connection wiring portion 51 can be made difficult to see.

[0072] According to the solar cell module 1 of the present embodiment, the second back surface side sealing material 81 is colored and has the same color or a similar color as the wiring shielding member 13, so that the wiring shielding member 13 is not conspicuous when viewed from the light-receiving surface 2 side, and the design property is good.

[0073] According to the solar cell module 1 of the present embodiment, since the unevenness 18 is formed on the surface of the wiring shielding member 13 on the light-receiving surface 2 side, it is difficult to have regular reflection on the surface of the wiring shielding member 13 on the light-receiving surface 2 side, and it is difficult for the wiring shielding member 13 to cause glare when viewed from the light-receiving surface 2 side.

[0074] According to the solar cell module 1 of this embodiment, since the light-receiving side sealing substrate 12 has irregularities 15 with a height of 0.1 μm or more and 10 μm or less formed on the surface on the light-receiving surface 2 side, an antiglare function is imparted, and glare on the light-receiving surface 2 is less likely to occur.

[0075] According to the solar cell module 1 of this embodiment, since the light-receiving side sealing substrate 12 has a colored coating layer 16 formed on the surface on the solar cell string 6 side, by adjusting the color of the coating layer 16, the color of the coating layer 16 can control the appearance color of the solar cell module 1.

[0076] According to the solar cell module 1 of this embodiment, the wiring shielding member 13 overlaps a part of the solar cell string 6 when viewed from the light-receiving surface 2 side. Therefore, since no gap is formed between the solar cell string 6 and the wiring shielding member 13 when viewed from the light-receiving surface 2 side, the design property is good.

[0077] According to the solar cell module 1 of this embodiment, the wiring shielding member 13 overlaps along the edge of the solar cell string 6 when viewed from the light-receiving surface 2 side, and the overlapping width of the wiring shielding member 13 with the solar cell string 6 is more than 0 mm and 5 mm or less. Therefore, the wiring shielding member 13 does not overlap the solar cell string 6 too much, and a decrease in the power generation amount of the solar cell string 6 due to the wiring shielding member 13 can be suppressed.

[0078] According to the solar cell module 1 of this embodiment, the battery-side terminal portion 70 constitutes a superimposed wiring portion connected to the solar cell string 6 on the light-receiving surface 2 side of the solar cell string 6, and the wiring shielding member 13 overlaps the entire battery-side terminal portion 70 when viewed from the light-receiving surface 2 side. Therefore, since the battery-side terminal portion 70 connected to the solar cell string 6 on the light-receiving surface 2 side can be hidden by the wiring shielding member 13, it is easy to extract power from the solar cell string 6, and the design property is also good.

[0079] According to the solar cell module 1 of the present embodiment, the wiring shielding member 13 is buried between the first light-receiving side sealing material 10 and the second light-receiving side sealing material 11, and most of the first light-receiving side sealing material 10 is in surface contact with the second light-receiving side sealing material 11. That is, since the wiring shielding member 13 is sandwiched and buried by the first light-receiving side sealing material 10 and the second light-receiving side sealing material 11, the thickness of the wiring shielding member 13 is absorbed by the first light-receiving side sealing material 10 and / or the second light-receiving side sealing material 11, and steps and inclinations due to the thickness of the wiring shielding member 13 are less likely to occur, and the sealing property is improved.

[0080] According to the solar cell module 1 of the present embodiment, the overlapping portions 25 to 28 include welding portions 30 to 33 where there is substantially no joint interface between the lateral shielding portions 20, 21 and the longitudinal shielding portions 22, 23. Therefore, since the wiring shielding member 13 that hides the wiring member 7 is constituted by a plurality of shielding portions 20 to 23 and these shielding portions 20 to 23 are adhered at the welding portions 30 to 33, the wiring member 7 can be hidden at a lower cost compared to the case of forming it in a "square" shape with a single wiring shielding member 13.

[0081] According to the solar cell module 1 of the present embodiment, since the overlapping portions 25 to 28 have a plurality of welding portions 30a to 30c, 31a to 31c, 32a to 32c, 33a to 33c, they are difficult to peel between the shielding portions 20 to 23.

[0082] According to the solar cell module 1 of the present embodiment, since the welding portions 30a to 30c, 31a to 31c, 32a to 32c, 33a to 33c are arranged at intervals in the longitudinal direction Y, they are more difficult to peel between the shielding portions 20 to 23.

[0083] According to the solar cell module 1 of the present embodiment, the overlapping portions 25 to 28 have a width in the lateral direction X which is the extending direction of the connection wiring portion 51 and the lateral wiring portions 55, 60, 65 (first wiring portions). Therefore, it is difficult for the connection wiring portion 51 and the lateral wiring portions 55, 60, 65 to be exposed due to the displacement between the shielding portions 20 to 23.

[0084] According to the solar cell module 1 of the present embodiment, since the welding portions 30 to 33 have the concave portions 35 on the back surface 3 side, the concave portions 35 are less noticeable when viewed from the light receiving surface 2 side.

[0085] According to the solar cell module 1 of the present embodiment, since the arithmetic mean roughness of the surfaces on the light receiving surface 2 side of the welding portions 30 to 33 is smaller than the arithmetic mean roughness of the surfaces on the light receiving surface 2 side of the shielding portions 20 to 23, the welding portions 30 to 33 are less noticeable when viewed from the light receiving surface 2 side.

[0086] According to the solar cell module 1 of the present embodiment, since the wiring shielding member 13 has the unevenness 18 formed at least on the surface on the light receiving surface 2 side, light is less likely to be specularly reflected on the surface on the light receiving surface 2 side of the wiring shielding member 13, and glare is less likely to occur on the surface on the light receiving surface 2 side of the wiring shielding member 13 when viewed from the light receiving surface 2 side. Further, the wiring shielding member 13 is likely to be in close contact with the first light receiving side sealing material 10.

[0087] According to the solar cell module 1 of the present embodiment, since the arithmetic mean roughness of the surface on the light receiving surface 2 side of the wiring shielding member 13 is 0.1 μm or more and 1.2 μm or less, an antiglare function can be imparted to the wiring shielding member 13.

[0088] In the above-described embodiment, the current flow directions of the solar cell strings 6a to 6c constituting the one-direction solar cell string group and the solar cell strings 6d to 6f constituting the reverse-direction solar cell string group are opposite, but the present invention is not limited thereto. As shown in FIG. 9(a), each of the solar cell strings 6a to 6f may be electrically connected in parallel to form a parallel solar cell string group, and current may flow in the one direction C3. In this case, the parallel solar cell string groups may be electrically connected in series as shown in FIG. 9(b). In the solar cell module of FIG. 9(b), two parallel solar cell string groups are arranged in the horizontal direction X, and the wiring shielding member 13 includes a longitudinal shielding portion 100 arranged across the adjacent parallel solar cell string groups in addition to the shielding portions 20 to 23 so as to hide the wiring members 7 of the adjacent parallel solar cell string groups.

[0089] In the above-described embodiment, the welded portions 30 to 33 were formed by ultrasonic welding, but the present invention is not limited thereto. The welded portions 30 to 33 may be formed by other ultrasonic welding such as thermal welding or high-frequency welding.

[0090] In the above-described embodiment, the wiring shielding member 13 had unevenness 18 and 19 formed on both the surface on the light-receiving surface 2 side and the surface on the back surface 3 side, but the present invention is not limited thereto. The unevenness may be formed on only one of the surface on the light-receiving surface 2 side and the surface on the back surface 3 side, or the unevenness may not be formed on both surfaces.

[0091] In the above-described embodiment, in each of the overlapping portions 25 to 28, the lateral shielding portions 20 and 21 were located on the light-receiving surface 2 side with respect to the longitudinal shielding portions 22 and 23, but the present invention is not limited thereto. In each of the overlapping portions 25 to 28, the lateral shielding portions 20 and 21 may be located on the back surface 3 side with respect to the longitudinal shielding portions 22 and 23.

[0092] In the above-described embodiment, the light-receiving side sealing substrate 12 had unevenness 15 formed on the surface on the light-receiving surface 2 side, but the present invention is not limited thereto. The light-receiving side sealing substrate 12 may not have the unevenness 15 formed on the surface on the light-receiving surface 2 side.

[0093] In the above-described embodiment, the light-receiving side sealing substrate 12 had a colored coating layer 16 formed on the surface on the back surface 3 side, but the present invention is not limited thereto. The light-receiving side sealing substrate 12 may not have the coating layer 16 formed on the surface on the back surface 3 side.

[0094] In the above-described embodiment, two back surface side sealing materials 80 and 81 were provided between the solar cell string 6 and the back surface side sealing substrate 82, but the present invention is not limited thereto. The number of back surface side sealing materials between the solar cell string 6 and the back surface side sealing substrate 82 may be one.

[0095] In the above embodiment, the solar cell module 1 is used for a balcony railing, but the present invention is not limited to this. The solar cell module 1 can also be used for other purposes such as on a wall surface.

[0096] In the first embodiment described above, six solar cell strings 6a to 6f 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.

[0097] In the above embodiment, the unidirectional solar cell string group is configured by three solar cell strings 6, but the present invention is not limited to this. The unidirectional solar cell string group may be configured by one to two solar cell strings 6, or may be configured by four or more solar cell strings 6. Similarly, although the reverse direction solar cell string group is configured by three solar cell strings 6, the present invention is not limited to this. The reverse direction solar cell string group may be configured by one to two solar cell strings 6, or may be configured by four or more solar cell strings 6.

[0098] In the above embodiment, the first light-receiving-side sealing member 10 is made elastic so that the wiring shielding member 13 is embedded between the first light-receiving-side sealing member 10 and the second light-receiving-side sealing member 11, but the present invention is not limited to this. The second light-receiving-side sealing member 11 may be made elastic so that the wiring shielding member 13 is embedded between the first light-receiving-side sealing member 10 and the second light-receiving-side sealing member 11.

[0099] 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.

[0100] As long as the above-described embodiments are within the technical scope of the present invention, each component can be freely replaced or added between the embodiments.

Explanation of Signs

[0101] 1 Solar cell module 2 Light-receiving surface 3 Back surface 5 Light-receiving side sealing member 6, 6a~6f Solar cell string 7 Wiring member 8 Back surface side sealing member 10 First light-receiving side sealing material 11 Second light-receiving side sealing material 12 Light-receiving side sealing substrate 13 Wiring shielding member 16 Coating layer 18 Concavo-convex 40 Solar cell 51 Connection wiring part (first wiring part) 55 Horizontal wiring part (first wiring part) 60 Horizontal wiring part (first wiring part) 65 Horizontal wiring part (first wiring part) 70 Battery side terminal part (stacked wiring part) 80 First back surface side sealing material 81 Second back surface side sealing material 82 Back surface side sealing substrate

Claims

1. A solar cell module having a first main surface as a light-receiving surface, a solar cell string having at least one solar cell, a wiring member for extracting power from the solar cell string to the outside, and a light-receiving side sealing member for covering the light-receiving surface side of the solar cell string, wherein the wiring member has a first wiring portion extending along the edge of the solar cell string when viewed in a plan view from the light-receiving surface side, the light-receiving side sealing member includes a first light-receiving side sealing material, a second light-receiving side sealing material, a light-receiving side sealing substrate, and a wiring shielding member, and the first light-receiving side sealing material and the second light-receiving side sealing material are disposed between the solar cell string and the light-receiving side sealing substrate, the wiring shielding member is interposed between the first light-receiving side sealing material and the second light-receiving side sealing material, the wiring shielding member surrounds the solar cell string and partially overlaps the first wiring portion when viewed in a plan view from the light-receiving surface side, a solar cell module.

2. The solar cell module according to claim 1, wherein the first wiring portion is hidden by the wiring shielding member and is not visible when viewed from the light-receiving surface side.

3. The solar cell module according to claim 1 or 2, wherein the wiring shielding member is colored.

4. having a back side sealing member for covering the back side of the solar cell string, the back side sealing member includes a back side sealing substrate and a back side sealing material interposed between the back side sealing substrate and the solar cell string, The solar cell module according to claim 3, wherein the back side sealing material is colored and has the same color or a similar color as the wiring shielding member.

5. The solar cell module according to claim 1 or 2, wherein the wiring shielding member has irregularities formed at least on the surface on the light-receiving surface side.

6. The solar cell module according to claim 1 or 2, wherein the light-receiving side sealing substrate has irregularities of 0.1 μm or more and 10 μm or less formed on the surface on the light-receiving surface side.

7. The solar cell module according to claim 1 or 2, wherein the light-receiving side sealing substrate has a colored coating layer formed on the surface on the solar cell string side.

8. The solar cell module according to claim 1 or 2, wherein the wiring shielding member overlaps a part of the solar cell string when viewed from the light-receiving surface side.

9. The solar cell module according to claim 1 or 2, wherein the wiring shielding member overlaps along the edge of the solar cell string when viewed from the light-receiving surface side. The solar cell module according to claim 8, wherein the wiring shielding member has an overlapping width with the solar cell string that exceeds 0 mm and is 5 mm or less.

10. The first wiring portion has an overlapping wiring portion that is connected to the solar cell string on the light-receiving surface side of the solar cell string. The solar cell module according to claim 8, wherein the wiring shielding member overlaps the entire overlapping wiring portion when viewed from the light-receiving surface side.

11. The wiring shielding member is buried between the first light-receiving side sealing material and the second light-receiving side sealing material. The solar cell module according to claim 1 or 2, wherein most of the first light-receiving side sealing material is in surface contact with the second light-receiving side sealing material.

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