Solar cell module

Abstract

To provide a solar cell module in which a wiring member can be concealed at lower cost than 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, and a wiring member that extracts power from the solar cell string to the outside. 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, and a wiring shielding member. 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. The wiring shielding member includes a first shielding part and a second shielding part. The first shielding part and the second shielding part overlap with each other partially to form an overlap part. The overlap part includes a weld part where a junction interface between the first shielding part and the second shielding part does not exist substantially.SELECTED DRAWING: Figure 5

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 rooftops 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, 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 outside the solar cell module, a wiring member is connected to the solar cell string and taken out to the outside via the outer periphery of the solar cell string. 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 in a state where the solar cell module is installed 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, the inventor of the present invention prototyped a wiring shielding member in which a single material sheet was processed into a shape surrounding the solar cell string along the wiring member in order to hide the internal wiring member of the solar cell module when viewed from the light-receiving surface side, and considered that by overlapping the wiring shielding member on the wiring member from the light-receiving surface side, the wiring member would be hidden by the wiring shielding member and would be less visible when viewed from the light-receiving surface side. As a result of the prototype, it was successful in making the wiring member less visible when viewed from the light-receiving surface side by the wiring shielding member, and improving the design property.

[0006] However, when mass-producing the prototyped wiring shielding member, the portion of the wiring shielding member that hits the solar cell string becomes an opening, and the portion of the material sheet that hits the opening cannot be used for shielding the wiring member, so there is a problem of increased material cost.

[0007] Therefore, an object of the present invention is to provide a solar cell module that can hide a wiring member at a lower cost than in the prior art.

Means for Solving the Problems

[0008] 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, and a wiring member for taking out power from the solar cell string to the outside, 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, and has a wiring shielding member, and 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, the wiring shielding member has a first shielding portion and a second shielding portion, a part of the first shielding portion and the second shielding portion overlap to form an overlapping portion, and the overlapping portion includes a welded portion where there is substantially no joining interface between the first shielding portion and the second shielding portion.

[0009] According to this aspect, the wiring shielding member that hides the first wiring portion is composed of a plurality of shielding portions, and the first shielding portion and the second shielding portion among these shielding portions are adhered by a welded portion, so the wiring member can be hidden at a lower cost compared to the case of processing a single wiring shielding member according to the wiring member.

[0010] A preferred aspect is that the overlapping portion has at least two welded portions.

[0011] According to this aspect, since the first shielding portion and the second shielding portion are adhered by a plurality of welded portions, it is difficult for the second shielding portion to peel off from the first shielding portion.

[0012] A preferred aspect is that the overlapping portion extends in a predetermined direction, has at least three welded portions, and the three welded portions are arranged at intervals in the predetermined direction.

[0013] According to this aspect, it is even more difficult for the second shielding portion to peel off from the first shielding portion.

[0014] A preferred aspect is that the overlapping portion has a width in the extending direction of the first wiring portion.

[0015] According to this aspect, it is difficult for the first wiring portion to be exposed due to the deviation between the shielding portions.

[0016] A preferred aspect is a solar cell module having the second main surface as the back surface, wherein the welding portion has a concave portion on the surface on the back surface side.

[0017] According to this aspect, since the welding portion has a concave portion on the back surface side, the concave portion is less likely to be conspicuous when viewed from the light-receiving surface side.

[0018] A preferred aspect is that the first shielding portion is located on the light-receiving surface side of the second shielding portion in the overlapping portion, and the arithmetic mean roughness of the surface on the light-receiving surface side of the welding portion is smaller than the arithmetic mean roughness of the first shielding portion.

[0019] According to this aspect, since the arithmetic mean roughness of the surface on the light-receiving surface side of the welding portion is smaller than that of the first shielding portion, the welding portion is less likely to be conspicuous when viewed from the light-receiving surface side.

[0020] A preferred aspect is that the first shielding portion overlaps with the first wiring portion when viewed from the light-receiving surface side.

[0021] According to this aspect, when viewed from the light-receiving surface side, the first wiring portion can be hidden by the first shielding portion and is difficult to be seen.

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

[0023] According to this aspect, no gap can be formed between the first shielding portion and the solar cell string, and the design property is improved as compared with the prior art.

[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 too much with the solar cell string, and it is possible to suppress a decrease in the power generation amount of the solar cell string due to the wiring shielding member.

[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 with 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 has irregularities formed at least on the surface on the light receiving surface side.

[0029] 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.

[0030] A preferred aspect is that the arithmetic mean roughness of the surface on the light receiving surface side of the wiring shielding member is 0.1 μm or more and 1.2 μm or less.

[0031] According to this aspect, an anti-glare function can be imparted to the wiring shielding member.

[0032] A preferred aspect is that the wiring shielding member makes the first wiring portion invisible when viewed from the light receiving surface side.

[0033] According to this aspect, since the first wiring portion is not visible, the design property is further improved.

[0034] A preferred aspect is that at least one of the first shielding portion and the second shielding portion is in a sheet shape.

[0035] According to this aspect, the thickness of the entire solar cell module can be reduced.

Advantages of the Invention

[0036] According to the solar cell module of the present invention, a wiring member can be hidden at a lower cost as compared with the prior art.

Brief Description of the Drawings

[0037]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0038] Hereinafter, embodiments of the present invention will be described in detail.

[0039] 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 between the light-receiving side sealing member 5 and the back surface side sealing member 8. When light is incident on the light-receiving surface 2, the solar cell module 1 can generate electricity with the internal solar cell strings 6. One of the main features of the solar cell module 1 of the present embodiment is that a wiring shielding member 13 is provided on the light-receiving side sealing member 5, and the wiring shielding member 13 hides part or all of the wiring member 7.

[0040] (Light-receiving side sealing member 5) The light-receiving side sealing member 5 covers the light-receiving surface 2 side of the solar cell strings 6. As shown in FIG. 4, it 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.

[0041] 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 that adheres between the solar cell strings 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 deform along the solar cell strings 6 and the wiring member 7 to bury part of the solar cell strings 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.

[0042] 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 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 light-transmitting properties. For example, a resin sealing material such as a polyolefin elastomer can be used.

[0043] The light-receiving side sealing substrate 12 is a light-transmitting insulating substrate having sealing properties, insulating properties, and light-transmitting properties, and is a member constituting 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 light-transmitting properties. 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 an antiglare glass having irregularities 15 formed on part or all of the surface on the light-receiving surface 2 side as shown in FIG. 4, and is also a colored glass having a colored coating layer 16 formed on the surface on the back surface 3 side. From the viewpoint of allowing light to enter the solar cell string 6 side while exhibiting an antiglare function, the arithmetic mean roughness of the region where the irregularities 15 are 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.

[0044] The coating layer 16 is a light-transmitting colored layer that is colored and has light-transmitting properties. The color of the coating layer 16 is not particularly limited, and for example, a dark color such as gray or black can be used. The coating layer 16 of the present embodiment is composed of a multilayer film in which films having different refractive indexes and generally transparent films overlap, and the reflected light at the interface between the films interferes due to the difference in refractive indexes to produce color.

[0045] As used herein, "colored" means a color other than colorless and transparent (i.e., colorless in the narrow sense), including not only chromatic colors but also achromatic colors such as white, gray, and black, and also includes cases where color is produced by light scattering or light interference when light is incident even if it is colorless. The same shall apply hereinafter.

[0046] 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 a colored, substantially non-translucent member having substantially no translucency, and is preferably a black and opaque sealing material. "Substantially having no translucency" as used herein means a light transmittance in the thickness direction of 3% or less. The same shall apply hereinafter.

[0047] 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 has unevenness 19 formed on the surface on the back surface 3 side as well. From the viewpoint of enhancing the adhesion with the second light receiving side sealing material 11 while imparting an anti-glare function, 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 viewpoint 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.

[0048] As shown in FIG. 6, the wiring shielding member 13 is a rectangular 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, 21 (first shielding portions) and longitudinal shielding portions 22, 23 (second shielding portions), and the shielding portions 20 to 23 are connected by ultrasonic welding.

[0049] As shown in FIG. 6, the lateral shielding portions 20, 21 are sheet-like portions having a width in the longitudinal direction Y and extending 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 string 6 interposed therebetween when viewed in plan from the light receiving surface 2 side. The longitudinal shielding portions 22, 23 are sheet-like portions having a width in the lateral direction X and extending linearly in the longitudinal direction Y, and are parallel to each other with the solar cell string 6 interposed therebetween when viewed in plan from the light receiving surface 2 side.

[0050] When viewed in plan from the light-receiving surface 2 side, the lateral shielding portions 20 and 21 have, in the lateral direction X, one end overlapping beyond the edge of the longitudinal shielding portion 22 to form overlapping portions 25 and 26, and the other end overlapping beyond the edge of the longitudinal shielding portion 23 to form overlapping portions 27 and 28. That is, the overlapping portions 25 and 26 are portions where the lateral shielding portions 20 and 21 overlap the longitudinal shielding portion 22 in the thickness direction, respectively, and the overlapping portions 27 and 28 are portions where the lateral shielding portions 20 and 21 overlap the longitudinal shielding portion 23 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).

[0051] 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.

[0052] 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.

[0053] The welding portions 30 to 33 are formed by ultrasonic welding of the shielding portions 20 and 21 on the distal side (the back surface 3 side) and the shielding portions 22 and 23 on the proximal side (the light-receiving surface 2 side) with reference to the light-receiving side sealing substrate 12, and are portions where there is substantially no joining interface between the shielding portions 20 and 21 on the distal side and the shielding portions 22 and 23 on the proximal side. The welded portions 30 to 33 of the present embodiment are formed by pressing a horn against the light-receiving side sealing substrate 12 from the shielding portions 20 and 21 on the distal side (the back surface 3 side) toward the shielding portions 22 and 23 on the proximal side (the light-receiving surface 2 side), and transmitting ultrasonic waves. Therefore, in the welded portions 30 to 33, the surface on the light-receiving surface 2 side of the shielding portions 22 and 23 on the proximal side is a smooth surface or has a surface roughness comparable to that of other portions of the surface on the light-receiving surface 2 side, whereas concave portions 35 are formed on the surface on the back surface 3 side of the shielding portions 20 and 21 on the distal side as shown in FIG. 5.

[0054] In the first overlapping portion 25, the first welded 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 welded portions 30a to 30c. Similarly, in the second overlapping portion 26, the second welded 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 welded portions 31a to 31c. In the third overlapping portion 27, the third welded portions 32a to 32c are arranged linearly at intervals in the longitudinal direction Y, and there are portions that are not welded between the third welded portions 32a to 32c. Similarly, in the fourth overlapping portion 28, the fourth welded portions 33a to 33c are arranged linearly at intervals in the longitudinal direction Y, and there are portions that are not welded between the fourth welded portions 33a to 33c.

[0055] (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 in series directly or via a conductive adhesive 41. The solar cell 40 is provided with a negative electrode terminal portion 42 on one main surface and a positive electrode 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 a plan view, the negative electrode terminal portion 42 is provided along one side 44 in the vicinity of one side 44, and the positive electrode terminal portion 43 is provided along the opposite side 45 in the vicinity of the opposite side 45 to one side 44. The solar cell string 6 of this embodiment is connected (so-called, stringing connection) with overlapping portions between the negative electrode terminal portions 42 and the positive electrode terminal portions 43 between adjacent solar cell cells 40, 40.

[0056] The conductive adhesive 41 is a conductive member having conductivity and is an adhesive for connecting between the terminal portions 42, 43 of adjacent solar cell cells 40, 40. The conductive adhesive 41 of this embodiment is a conductive paste.

[0057] (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 wirings 50a to 50c and a connection wiring 51.

[0058] As shown in FIG. 8, the first extraction wiring 50a is a "U" - shaped part when viewed in plan from the light - receiving surface 2 side, and includes a lateral wiring part 55 and longitudinal wiring parts 56, 57. The lateral wiring part 55 is a wiring linearly extending in the lateral direction X (the parallel arrangement direction of each solar cell string 6). The longitudinal wiring parts 56, 57 are wirings extending in the longitudinal direction Y (the direction orthogonal to the extension direction of the lateral wiring part 55) from both end parts in the extension direction of the lateral wiring part 55.

[0059] As shown in FIG. 8, the second extraction wiring 50b is an "L" - shaped part when viewed in plan from the light - receiving surface 2 side, and includes a lateral wiring part 60 and a longitudinal wiring part 61. The lateral wiring part 60 is a wiring linearly extending in the lateral direction X (the parallel arrangement direction of each solar cell string 6), and is parallel to the lateral wiring part 55 with the solar cell string 6 interposed therebetween when viewed in plan from the light - receiving surface 2 side. The longitudinal wiring part 61 is a wiring extending in the longitudinal direction Y (the direction orthogonal to the extension direction of the lateral wiring part 60) from one end part in the extension direction of the lateral wiring part 60 toward the longitudinal wiring part 56. The longitudinal wiring part 61 is linearly arranged in parallel with the longitudinal wiring part 56 with a space therebetween in the longitudinal direction Y.

[0060] 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 lateral wiring portion 65 and a longitudinal wiring portion 66. The lateral wiring portion 65 is a wiring that linearly extends in the lateral direction X (the juxtaposition direction of the solar cell strings 6), and is parallel to the lateral wiring portion 55 with the solar cell string 6 interposed therebetween when viewed in plan from the light-receiving surface 2 side. The lateral wiring portion 65 is arranged in a straight line at an interval from the lateral wiring portion 60 in the lateral direction X. The longitudinal wiring portion 66 is a wiring that extends in the longitudinal direction Y from the other end of the lateral wiring portion 65 in the extending direction toward the longitudinal wiring portion 57, and extends in the same direction as the longitudinal wiring portion 61. The longitudinal wiring portion 66 is arranged in a straight line at an interval from the longitudinal wiring portion 57 in the longitudinal direction Y.

[0061] The connection wiring portion 51 is a wiring that connects each extraction wiring portion 50a to 50c and each solar cell string 6. As shown in FIG. 8, the connection wiring portion 51 is a ladder-shaped wiring when viewed in plan, and includes a battery-side terminal portion 70, an extraction-side terminal portion 71, and a terminal connection portion 72. The battery-side terminal portion 70 extends in the lateral direction X and is a portion connected to the negative terminal portion 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 portion 43 of the solar cell 40 located at the upstream end. The extraction-side terminal portion 71 extends in the lateral direction X and is a portion connected to the lateral wiring portions 55, 60, and 65 of the extraction wiring portions 50a to 50c. The terminal connection portion 72 extends in the longitudinal direction Y and is a portion that connects the battery-side terminal portion 70 and the extraction-side terminal portion 71.

[0062] (Back surface side sealing member 8) As shown in FIG. 2, the back surface side sealing member 8 covers the back surface 3 side of the solar cell string 6, and includes a first back surface side sealing material 80, a second back surface side sealing material 81, a back surface side sealing substrate 82, and a wiring extraction hole (not shown).

[0063] The first backside sealing material 80 is an insulating sealing material having sealing properties and insulating properties, and is an adhesive material that adheres between the solar cell string 6 and the wiring member 7 and the second backside sealing material 81 as shown in FIG. 3. The first backside 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 backside 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.

[0064] The second backside sealing material 81 is an insulating sealing material having sealing properties and insulating properties, and is an adhesive material that adheres between the first backside sealing material 80 and the backside sealing substrate 82 as shown in FIG. 3. 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-transparent, and is preferably a colored opaque sealing material. The second backside sealing material 81 of the present embodiment is the same color as or a color close to that of the wiring shielding member 13, and preferably has a color difference of 5.0 or less, preferably 2.5 or less, and more preferably 1.2 or less in the CIE1976L*a*b* color space according to JIS Z 8781-4:2013.

[0065] The so-called "color close" means that the color difference is 5.0 or less in the CIE1976L*a*b* color space according to JIS Z 8781-4:2013.

[0066] The backside sealing substrate 82 is an insulating substrate having sealing properties and insulating properties, and is a member that constitutes the backside 3. The backside sealing substrate 82 is not particularly limited as long as it has sealing properties and insulation properties. For example, a glass substrate such as float glass can be used.

[0067] 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 reference to the solar cell string 6, and is a through hole that penetrates the backside sealing materials 80, 81 and the backside sealing substrate 82 in the thickness direction.

[0068] Subsequently, the positional relationship of each part of the solar cell module 1 of the present embodiment will be described.

[0069] 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 lateral direction X. As shown in FIG. 6, the current flow directions C1 of the solar cell strings 6a to 6c each face in one direction, and the current flow directions C2 of the solar cell strings 6d to 6f each face in the direction opposite to the current flow direction C1 of the solar cell strings 6a to 6c. That is, in the solar cell module 1, the solar cell strings 6a to 6c constitute a unidirectional solar cell string group in which the current flow direction C1 flows in one direction, and the solar cell strings 6d to 6f constitute 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 constitute the unidirectional solar cell string group, the positive electrode terminal portions 43 are located on the upper side, and the negative electrode terminal portions 42 are located on the lower side. In the solar cell strings 6d to 6f that constitute the reverse-direction solar cell string group, the positive electrode terminal portions 43 are located on the lower side, and the negative electrode terminal portions 42 are located on the upper side.

[0070] As shown in FIG. 2, when viewed in plan, the extraction wirings parts 50a to 50c of the wiring member 7 are provided so as to surround the solar cell strings 6a to 6f. As shown in FIG. 6, the first extraction wiring part 50a of the wiring member 7 has a lateral wiring part 55 connecting the positive terminal parts 43 of the solar cell strings 6a to 6c and the negative terminal parts 42 of the solar cell strings 6d to 6f via a connection wiring part 51 to make them at the same potential. The second extraction wiring part 50b of the wiring member 7 has a lateral wiring part 60 connecting the negative terminal parts 42 of the solar cell strings 6a to 6c via a connection wiring part 51 to make them at the same potential. The third extraction wiring part 50c of the wiring member 7 has a lateral wiring part 65 connecting the positive terminal parts 43 of the solar cell strings 6d to 6f via a connection wiring part 51 to make them at the same potential. The connection wiring part 51 of the wiring member 7 has a battery - side terminal part 70 connected to the negative terminal part 42 or the positive terminal part 43 of the corresponding solar cell string 6, and an extraction - side terminal part 71 connected to the corresponding extraction wiring parts 50a to 50c.

[0071] As shown in FIG. 6, when the solar cell module 1 is viewed in plan from the light - receiving surface 2 side, a part of the wiring shielding member 13 overlaps with the solar cell strings 6 and the wiring member 7.

[0072] Specifically, as shown in FIG. 7(a), the lateral shielding part 20 of the wiring shielding member 13 overlaps with the lateral wiring part 55 of the extraction wiring part 50a of the wiring member 7. The wiring shielding member 13 further has the lateral shielding part 20 overlapping with a part of the solar cell string 6 in the longitudinal direction Y, and overlapping with the entire connection wiring part 51 including the battery - side terminal part 70 (the first electrode part) located on the light - receiving surface 2 side of the solar cell strings 6d to 6f. The overlapping width W2 between the lateral shielding part 20 and the solar cell string 6 is preferably wider than the width of the battery - side terminal part 70 and more than 0 mm and 5 mm or less.

[0073] Also, as shown in FIG. 7(b), the lateral shielding part 21 of the wiring shielding member 13 overlaps with the lateral wiring parts 60 and 65 of the extraction wiring parts 50b and 50c of the wiring member 7. The wiring shielding member 13 further has a lateral shielding portion 21 overlapping a part of the solar cell string 6 in the vertical direction Y, covering the entire connection wiring portion 51 including the battery-side terminal portions 70 (first electrode portions) located on the light-receiving surface 2 side of the solar cell strings 6a to 6c. It is more preferable that the overlapping width W3 between the lateral shielding portion 21 and the solar cell string 6 is wider than the width of the battery-side terminal portion 70 and is more than 0 mm and 5 mm or less.

[0074] As shown in FIG. 7, it is preferable that the wiring shielding member 13 has a vertical shielding portion 22 overlapping the vertical wiring portions 56 and 61 of the extraction wiring portions 50a and 50b of the wiring member 7, and further overlapping a part of the solar cell string 6 in the horizontal direction X. Similarly, it is preferable that the wiring shielding member 13 has a vertical shielding portion 23 overlapping the vertical wiring portions 57 and 66 of the extraction wiring portions 50a and 50c of the wiring member 7, and further overlapping a part of the solar cell string 6 in the horizontal direction X. It is preferable that the overlapping width W4 between the vertical shielding portions 22 and 23 and the solar cell string 6 is 0 mm or more and 3 mm or less.

[0075] 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 this 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.

[0076] The "most part" mentioned here refers to a part exceeding 50 percent of the whole.

[0077] 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 respective 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 respective 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, it is difficult to see the respective extraction wiring portions 50a to 50c and the connection wiring portion 51 from the light-receiving surface 2 side, and they are not conspicuous. As a result, the design property is better than that of the prior art.

[0078] According to the solar cell module 1 of the present embodiment, when viewed from the light-receiving surface 2 side, the respective 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, so the respective extraction wiring portions 50a to 50c and the connection wiring portion 51 are not visually recognized, and the design property is better.

[0079] According to the solar cell module 1 of the present embodiment, since the wiring shielding member 13 is colored, the respective extraction wiring portions 50a to 50c and the connection wiring portion 51 can be made difficult to see.

[0080] According to the solar cell module 1 of the present embodiment, since the second backside sealing material 81 is colored and has the same color or a similar color as the wiring shielding member 13, the wiring shielding member 13 is not conspicuous when viewed from the light-receiving surface 2 side, and the design property is good.

[0081] 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 specular 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.

[0082] According to the solar cell module 1 of the present embodiment, since the unevenness 15 of 0.1 μm or more and 10 μm or less is formed on the surface of the light-receiving side sealing substrate 12 on the light-receiving surface 2 side, an anti-glare function is imparted, and glare on the light-receiving surface 2 is difficult to occur.

[0083] According to the solar cell module 1 of the present embodiment, since the light-receiving side sealing substrate 12 has a colored coating layer 16 formed on the surface on the side of the solar cell string 6, 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.

[0084] According to the solar cell module 1 of the present embodiment, when viewed from the light-receiving surface 2 side, the wiring shielding member 13 overlaps a part of the solar cell string 6. Therefore, when viewed from the light-receiving surface 2 side, no gap is formed between the solar cell string 6 and the wiring shielding member 13, so the design property is good.

[0085] According to the solar cell module 1 of the present embodiment, when viewed from the light-receiving surface 2 side, the wiring shielding member 13 overlaps along the edge of the solar cell string 6, 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.

[0086] According to the solar cell module 1 of the present embodiment, the battery-side terminal portion 70 constitutes an overlapping wiring portion connected to the solar cell string 6 on the light-receiving surface 2 side of the solar cell string 6, and when viewed from the light-receiving surface 2 side, the wiring shielding member 13 overlaps the entire battery-side terminal portion 70. Therefore, 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, so it is easy to extract power from the solar cell string 6 and the design property is also good.

[0087] 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, resulting in good sealing performance.

[0088] 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, the wiring shielding member 13 that hides the wiring member 7 is composed of a plurality of shielding portions 20 to 23, and since these shielding portions 20 to 23 are adhered by the welding portions 30 to 33, the wiring member 7 can be hidden at a lower cost compared to the case of forming a "square" shape with a single wiring shielding member 13.

[0089] According to the solar cell module 1 of the present embodiment, the overlapping portions 25 to 28 have a plurality of welding portions 30a to 30c, 31a to 31c, 32a to 32c, 33a to 33c, so they are difficult to peel between the shielding portions 20 to 23.

[0090] According to the solar cell module 1 of the present embodiment, the welding portions 30a to 30c, 31a to 31c, 32a to 32c, 33a to 33c are arranged at intervals in the longitudinal direction Y, so they are more difficult to peel between the shielding portions 20 to 23.

[0091] 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.

[0092] According to the solar cell module 1 of the present embodiment, since the welding parts 30 to 33 have the concave parts 35 on the back surface 3 side, the concave parts 35 are less conspicuous when viewed from the light receiving surface 2 side.

[0093] 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 parts 30 to 33 is smaller than the arithmetic mean roughness of the surfaces on the light receiving surface 2 side of the shielding parts 20 to 23, the welding parts 30 to 33 are less conspicuous when viewed from the light receiving surface 2 side.

[0094] According to the solar cell module 1 of the present embodiment, since the wiring shielding member 13 has the irregularities 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. Also, the wiring shielding member 13 is likely to be in close contact with the first light receiving side sealing material 10.

[0095] 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.

[0096] According to the solar cell module 1 of the present embodiment, since each of the shielding parts 20 to 23 is formed of a sheet-like body, the overall thickness can be reduced.

[0097] 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 to each other, but the present invention is not limited to this. 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 one direction C3. In this case, as shown in FIG. 9(b), the parallel solar cell string groups may be electrically connected in series. 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, in addition to the shielding portions 20 to 23, a vertical shielding portion 100 arranged across the adjacent parallel solar cell string groups so as to hide the wiring members 7 of the adjacent parallel solar cell string groups.

[0098] In the above-described embodiment, the welding portions 30 to 33 were formed by ultrasonic welding, but the present invention is not limited thereto. The welding portions 30 to 33 may be formed by other ultrasonic welding such as thermal welding or high-frequency welding.

[0099] In the above-described embodiment, the wiring shielding member 13 has 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.

[0100] In the above-described embodiment, in each of the overlapping portions 25 to 28, the horizontal shielding portions 20 and 21 are located on the light-receiving surface 2 side with respect to the vertical shielding portions 22 and 23, but the present invention is not limited thereto. In each of the overlapping portions 25 to 28, the horizontal shielding portions 20 and 21 may be located on the back surface 3 side with respect to the vertical shielding portions 22 and 23.

[0101] In the above-described embodiment, the light-receiving side sealing substrate 12 has 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.

[0102] In the above-described embodiment, the light-receiving side sealing substrate 12 has 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.

[0103] In the above-described embodiment, two backside encapsulants 80 and 81 were provided between the solar cell string 6 and the backside encapsulation substrate 82. However, the present invention is not limited to this. The number of backside encapsulants between the solar cell string 6 and the backside encapsulation substrate 82 may be one.

[0104] In the above-described embodiment, the case where the solar cell module 1 is used for the balcony railing has been described. However, the present invention is not limited to this. The solar cell module 1 can also be used for other applications such as wall surfaces.

[0105] In the above-described first embodiment, six solar cell strings 6a to 6f were provided. However, the present invention is not limited to this. One or more and five or less solar cell strings 6 may be provided, or seven or more solar cell strings 6 may be provided.

[0106] In the above-described embodiment, a unidirectional solar cell string group was configured by three solar cell strings 6. However, the present invention is not limited to this. A unidirectional solar cell string group may be configured by one or more and two or less solar cell strings 6, or four or more solar cell strings 6. Similarly, a reverse-direction solar cell string group was configured by three solar cell strings 6. However, the present invention is not limited to this. A reverse-direction solar cell string group may be configured by one or more and two or less solar cell strings 6, or four or more solar cell strings 6.

[0107] In the above-described embodiment, the wiring shielding member 13 was buried between the first light-receiving side encapsulant 10 and the second light-receiving side encapsulant 11 by making the first light-receiving side encapsulant 10 elastic. However, the present invention is not limited to this. The wiring shielding member 13 may be buried between the first light-receiving side encapsulant 10 and the second light-receiving side encapsulant 11 by making the second light-receiving side encapsulant 11 elastic.

[0108] In the above-described first embodiment, the solar cell strings 6 were 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.

[0109] 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.

Description of Reference Numerals

[0110] 1 Solar cell module 2 Light-receiving surface 3 Back surface 6, 6a to 6f Solar cell strings 7 Wiring member 13 Wiring shielding member 18 Concavities and convexities 20, 21 Horizontal shielding portion (first shielding portion) 22, 23 Vertical shielding portion (second shielding portion) 25 First overlapping portion 26 Second overlapping portion 27 Third overlapping portion 28 Fourth overlapping portion 30, 30a to 30c First welding portion 31, 31a to 31c Second welding portion 32, 32a to 32c Third welding portion 33, 33a to 33c Fourth welding portion 51 Connection wiring portion (first wiring portion) 55 Horizontal wiring portion (first wiring portion) 60 Horizontal wiring portion (first wiring portion) 65 Horizontal wiring portion (first wiring portion)

Claims

1. A solar cell module having a first main surface as a light-receiving surface and at least one solar cell string, and a wiring member for extracting power from the solar cell string to the outside, 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, it has a wiring shielding member, the wiring shielding member surrounds the solar cell string when viewed in plan from the light-receiving surface side, and a part thereof overlaps the first wiring portion, the wiring shielding member has a first shielding portion and a second shielding portion, a part of the first shielding portion and the second shielding portion overlaps to form an overlapping portion, the overlapping portion includes a welded portion where there is substantially no bonding interface between the first shielding portion and the second shielding portion, a solar cell module.

2. The solar cell module according to claim 1, wherein the overlapping portion has at least two welded portions.

3. The overlapping portion extends in a predetermined direction and has at least three welded portions, the three welded portions are arranged at intervals in the predetermined direction, the solar cell module according to claim 2.

4. The solar cell module according to any one of claims 1 to 3, wherein the overlapping portion has a width in the extending direction of the first wiring portion.

5. A solar cell module having a second main surface as a back surface, the solar cell module according to any one of claims 1 to 3, wherein the welded portion has a concave portion on the surface on the back surface side.

6. The first shielding portion is located closer to the light-receiving surface side than the second shielding portion in the overlapping portion, the solar cell module according to any one of claims 1 to 3, wherein the arithmetic mean roughness of the surface on the light-receiving surface side of the welded portion is smaller than the arithmetic mean roughness of the first shielding portion.

7. The solar cell module according to any one of claims 1 to 3, wherein the first shielding portion overlaps the first wiring portion when viewed from the light-receiving surface side.

8. The solar cell module according to any one of claims 1 to 3, wherein the first shielding portion overlaps a part of the solar cell string when viewed from the light-receiving surface side.

9. 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 overlapping width of the wiring shielding member with the solar cell string is more than 0 mm and 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 solar cell module according to any one of claims 1 to 3, wherein the wiring shielding member has irregularities formed at least on the surface on the light-receiving surface side.

12. The solar cell module according to claim 11, wherein the arithmetic mean roughness of the surface on the light-receiving surface side of the wiring shielding member is 0.1 µm or more and 1.2 µm or less.

13. The solar cell module according to any one of claims 1 to 3, wherein the wiring shielding member makes the first wiring portion invisible when viewed from the light-receiving surface side.

14. The solar cell module according to any one of claims 1 to 3, wherein at least one of the first shielding portion and the second shielding portion is sheet-shaped.

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