JP5633412B2 - Solar cell module and mounting method - Google Patents

Description

  The present invention relates to a solar cell module and a method for mounting the solar cell module.

  A solar cell (a solar cell module or a combination of a plurality of solar cell modules) is a clean power generator that does not emit carbon dioxide and harmful exhaust gas that cause global warming.

  As solar cells, those using an inorganic material such as single crystal silicon or polycrystalline silicon for the photoelectric conversion layer are widely known. In solar cells using crystalline silicon, when silicon is exposed, the power generation characteristics may be deteriorated due to chemical changes, and damage may be caused by physical impact. The solar cell module protected by is used.

  As a solar cell, a thin-film solar cell using an inorganic material (for example, amorphous silicon) for a photoelectric conversion layer is known. Furthermore, an organic solar cell using an inorganic photoelectric conversion layer such as amorphous silicon as an organic semiconductor layer is also known.

JP 2008-201819 A

  Thin film solar cells (inorganic and organic) can be manufactured to be lighter and thinner than solar cells using single crystal or polycrystalline silicon. Furthermore, the thin film solar cell has a structure having flexibility (flexibility). For this reason, the thin film solar cell is expected to be used in a place where it cannot be installed by a solar cell using single crystal or polycrystalline silicon, or is difficult to install.

  This invention is made | formed in view of the said situation, and it aims at providing the technique which can attach a solar cell suitably with respect to a cylindrical structure.

The present invention employs the following means in order to solve the above-described problems. That is, the present invention has a front surface and a back surface, and the solar cell module is attached to the column by winding a fixing band around the column from the upper side of the surface in a state where the back surface is in contact with the circumferential surface of the column. And having a rectangular flat plate-like flexibility including a first direction arranged in the axial direction of the cylinder and a second direction arranged in the circumferential direction of the cylinder orthogonal to the axial direction. A resin substrate; a thin film solar cell module provided on the resin substrate; and at least a winding position of the fixing band formed in parallel to the second direction on the surface of the thin film solar cell module A solar cell module including two recesses. According to this, it is possible to provide a solar cell module that is wound in close contact with a curved wall surface of a cylindrical structure. The attachment to the structure can be fixed without using an adhesive because it can be fixed by winding a fixing band in accordance with the recess formed on the surface. Mounting and fixing can be performed without affecting the weather-resistant coating or rust prevention treatment applied to the wall of the structure. Even when the columnar structure is obstructed during installation, the concave part that defines the winding position of the fixed band is formed on the surface of the solar cell module. To do.

  The depth of the recess for use in fixing in the present invention may be 0.1 mm or more and 1.5 mm or less. Further, the depth of the recess may be 50% or less of the thickness of the solar cell module.

  In a preferred embodiment of the present invention, the back surface further includes at least one convex portion inserted into one of the at least two concave portions of another solar cell module disposed adjacent to the cylindrical axis in the axial direction. A solar cell module can be configured.

In addition, the present invention provides a rectangular flat plate-like flexibility including a first direction arranged in the axial direction of a cylinder and a second direction arranged in the circumferential direction of the cylinder perpendicular to the axial direction. A resin substrate, a thin film solar cell provided on the resin substrate, and at least two concave portions that are formed in parallel with the second direction on the surface and define a winding position of the fixing band. A solar cell module comprising: a solar cell module including: winding the solar cell module around the cylinder; winding the fixing band in a state where the fixing band is inserted into each of the recesses; and fastening the solar cell module to the column by tightening the fixing band. This is the mounting method.

  In the solar cell module mounting method, when the length of the solar cell module in the second direction is shorter than the circumferential length of the column, both end portions in the short direction of the solar cell module in a state of being wound around the column Are connected via a plate-like connecting material, and the solar cell module having a cylindrical shape by the connecting material may be fixed by the fixing band.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which can attach a solar cell suitably with respect to a cylindrical structure can be provided.

FIG. 1 is a view for explaining the mounting and fixing of the solar cell module of the present embodiment. FIG. 2 is a plan view for explaining the solar cell module body according to the present embodiment. FIG. 3 is a diagram schematically showing a cross-sectional structure of a flexible solar cell module applicable to the present embodiment. FIG. 4 is a schematic cross-sectional view for explaining the recesses (1a, 1b) indicated by XX in FIG. FIG. 5 is an explanatory diagram of a dimensional relationship included in the solar cell module. FIG. 6 is a cross-sectional view schematically illustrating a state in which the solar cell module is wound around the curved wall surface of the cylindrical structure 5, and is a cross-sectional view in the radial direction viewed from the upper side in the axial direction. FIG. 7A is a schematic view in which a solar cell module is wound around a structure. FIG. 7B is a schematic view of a solar cell module wound around a structure. FIG. 7C is a schematic diagram in which a solar cell module is wound around a structure. FIG. 8 is a schematic cross-sectional view of the modification taken along the line XX in FIG. FIG. 9 is a schematic diagram in which a solar cell module having a cross-sectional structure of a modification is wound around a structure. FIG. 10 is a schematic diagram in which a solar cell module having a cross-sectional structure of a modification is wound around a structure. FIG. 11A is an explanatory diagram using mold materials (13a, 13b) for forming the recesses (1a, 1b). FIG. 11B is an explanatory diagram using mold materials (13c, 13d, 13e) for forming the convex portions (1c, 1d).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The configuration of the following embodiment is an exemplification, and the present invention is not limited to the embodiment.

<Overview>
The inventor of the present application has come to recall the solar cell module of the present embodiment with a columnar structure such as a steel tower or a mobile base station built in the suburbs attached. This is because steel towers and mobile base stations built in the suburbs have good visibility and few shielding objects that block sunlight in the surroundings, and are therefore suitable for power generation environments using solar cell modules. In addition, the installation place of such a structure is mainly a place where it is difficult to arrange a power source or a place where the cost for installing the power source is high. This is because expectations are growing.

  However, various restrictions are imposed to attach the solar cell module to the wall surface (circumferential surface) of such a structure. First, the use of adhesives is restricted in consideration of damage to weather-resistant coating and rust prevention treatment applied to steel towers and mobile base stations, etc., so the solar cell module fixing method is limited (for example, stainless steel fixing) Fixed by a band).

  In addition, columnar structures such as steel towers and mobile base station columns often have a diameter exceeding 1000 mm in order to ensure environmental resistance and installation strength at the installation site. For this reason, when the solar cell module is attached in the vicinity of the structure, the field of view of the worker is obstructed by the structure, so that it takes time to position the attachment and fixing. Furthermore, when the solar cell module is mounted at a height of several tens of meters, the mounting work is a work at a high place where the scaffolding and procedures are limited. In a state where the scaffold for work is restricted and the field of view is restricted, there is a possibility that the mounting position of the solar cell module that is wound around and fixed to the wall surface is obliquely displaced and fixed, for example. In this fixed state, a gap or the like is generated between the curved wall surface of the structure and the back surface of the solar cell module, and there is a concern that weather resistance cannot be ensured.

<Configuration of Solar Cell Module 10>
FIG. 1 is a view for explaining the mounting and fixing of the solar cell module of the present embodiment. As shown in FIG. 1, the structure (column) 5 has a columnar shape, and its wall surface is formed on a cylindrical peripheral surface. The solar cell module 10 is a rectangular flat-plate thin film solar cell module having flexibility, and is tightly wound around a wall surface having a circumferential surface of the structure 5. A plurality of solar cell units 11 are juxtaposed in the center of the planar surface of the solar cell module 10 to form a light receiving region for power generation. The surface 10e of the solar cell module 10 is formed with a recess 1a that defines the fixing position of the fixing band B1 and a recess 1b that defines the fixing position of the fixing band B2. The recess 1a formed on the end portion 10a side and the recess 1b formed on the end portion 10b side are parallel to each other.

The solar cell module 10 wound around the structure 5 is fixed using general-purpose or dedicated fixing bands (B1, B2). The fixing bands (B1, B2) are stainless steel bands coated with, for example, vinyl chloride, and a fastener is provided at an end thereof. In a state where the fixing band (B1, B2) is in contact with the bottom surface of the recess (1a, 1b) in accordance with the position where the recess (1a, 1b) is formed from above the solar cell module 10 wound around the wall surface. Further, the fixing bands (B 1 and B 2) are wound around the top of 10. The wound fixing bands (B1, B2) are fastened to the wall surface of the structure 5 together with the solar cell module 10 by fasteners provided at the ends thereof.

  When the solar cell module 10 is wound around a wall surface (circumferential surface) curved in the circumferential direction of the structure (cylinder) 5, the length in the longitudinal direction of the solar cell module 10 is shorter than the circumferential length of the column 5. The end portions 10c and 10d of the solar cell module 10 face each other. Mounting and fixing by adjusting the height of both ends so that the heights of both of them coincide with each other while confirming the vertical position of the recesses 1a and 1b formed on the surface 10e of the opposite ends (10c, 10d) Positioning is possible. That is, the solar cell module 10 can be closely attached to the cylinder in a direction in which each of the recesses (1a, 1b) is orthogonal to the axial direction of the cylinder 5.

  In particular, when the structure has a diameter (diameter) exceeding 1000 mm, the installation worker cannot extend the neck and see the back side of the column, and the end of the solar cell module 10 wound around the column 5 is It is difficult to confirm whether they are not shifted. On the other hand, since the solar cell module 10 is provided with the recesses (1a, 1b), even if the field of view is blocked by the structure (column) 5, the opposing ends (10c, 10d) By checking the vertical position of the concave portion 1a and the concave portion 1b formed on the surface 10e, by adjusting the height so that the concave portion 1a of the end portion 10c and the concave portion 1b of the end portion 10d are arranged on the same straight line, It is possible to attach the back surface 10f in close contact with the wall surface without causing positional displacement. In this state, by further winding the fixing band B1 from the surface 10e side in accordance with the formation positions of the recesses 1a and 1b, an attachment operation without using an adhesive material can be realized. Since the fixing band is wound in accordance with the formation positions of the recesses 1a and 1b formed parallel to the surface 10e, the fastening force according to the solar cell module 10 is uniform and uniform.

  As will be described later, the auxiliary member 6 shown in FIG. 1 is a member for connecting the longitudinal direction of the solar cell module 10 to make the outer shape of the solar cell module 10 cylindrical, and is used as a backing plate. . As shown in FIG. 1, the auxiliary member 6 can be formed in a rectangular plate shape, for example. As illustrated in FIGS. 7C and 10, the auxiliary member 6 functions as a connecting member for the solar cell modules 10 that are vertically connected when the plurality of solar cell modules 10 are wound and fixed.

<< Configuration of Solar Cell Module 10 Main Body >>
Next, the structure of the solar cell module 10 main body will be described. FIG. 2 is a plan view for explaining the main body of the solar cell module 10 according to the present embodiment. As illustrated in FIG. 2, the solar cell module 10 has a rectangular planar shape. The longitudinal direction includes substantially parallel ends (10a, 10b), and the lateral direction includes substantially parallel ends (10c, 10d). In the region surrounded by the end portions (10a, 10b) in the longitudinal direction and the end portions (10c, 10d) in the short direction, there are recesses (1a, 1b) for defining the fixing position of the fixing band, a plurality of suns A battery unit 11, a junction box 12, and the like are provided. The end portions (10a, 10b) have a relationship of being vertically positioned in the axial direction in a state where the solar cell module 10 is wound around the wall surface of the structure (column) 5. In the example of FIG. 2, the end 10a is disposed on the upper side in the axial direction, and the end 10b is disposed on the lower side in the axial direction.

  The recesses (1 a, 1 b) that define the fixing position of the fixing band are provided in the longitudinal direction of the solar cell module 10. The concave portion 1a is formed at the upper portion (end portion 10a side) of the solar cell module 10, and the concave portion 1b is formed at the lower portion (end portion (10b side) of the solar cell module 10, and both extend in parallel. A band-shaped blank area having a predetermined width is formed between each of 1a and the end 10a and between the recess 1b and the end 10b.The recesses (1a and 1b) have a width in the short direction. The groove portions 2a and 2b form a pair of parallel grooves, and a plurality of solar cell units 11 and junction boxes 12 are provided between the recess portions 1a and 1b. It is arranged.

  In the laying (mounting) operation on the wall surface (circumferential circumferential surface) of the cylindrical structure (column) 5 (FIG. 1), the fixing band is accommodated in the parallel groove portions (2a, 2b) and the upper side. The solar cell module 10 can be attached and fixed without using an adhesive. When the solar cell module 10 is tightly wound around the wall surface, the parallel groove portions (2a, 2b) formed on the surface 10e serve as a guide for positioning on the curved wall surface, and workability is improved. Details of the recesses (1a, 1b) will be described later.

<< Solar cell unit 11 >>
The solar cell module 10 includes a plurality of solar cell units 11. Each of the solar cell units 11 has a longitudinal direction and a short direction. As for each solar cell unit 11, the short direction is arrange | positioned in the longitudinal direction of the solar cell module 10, and the longitudinal direction is arrange | positioned in the transversal direction of the solar cell module 10. FIG. In the solar cell module 10 shown in FIG. 2, 18 solar cell units 11 are arranged in parallel in the longitudinal direction. However, the total number of solar cell units 11 provided in one solar cell module 10 and the number of arrangements in the longitudinal direction and the short direction can be appropriately set according to the power generation required for the solar cell module 10.

  Each solar cell unit 11 has a positive terminal and a negative terminal (not shown), and each of the positive terminal and the negative terminal is electrically connected to the junction box 12. The solar cell unit 11 in the example shown in FIG. 2 is in a state where the solar cell units 11 are connected in parallel, for example. Each set of solar cell units 11 is connected to a positive electrode extraction portion (not shown) and a negative electrode extraction portion (not shown) that are common among the units, and each electrode extraction portion 11 is a junction. It is connected to the box 12 through wiring.

  Each solar cell unit 11 is composed of a plurality of solar cell elements (solar cell) having a set of output terminals (positive electrode terminal and negative electrode terminal). In this embodiment, it is a unit formed by electrically connecting output terminals of a plurality of solar cell elements in series. In the longitudinal direction of the solar cell unit 11, there is an array structure of solar cell elements in which a plurality of solar cell elements are connected in series.

《Junction box 12》
The junction box 12 is provided at a position that does not overlap the solar cell unit 11 and between the recesses (1a, 1b). The junction box 12 is a connection interface for transferring power generated by the solar cell module 10 to various devices that receive power supply, for example, and functions as an electrical connection box for taking out power from the solar cell module 10. To do.

  As illustrated in FIG. 2, the arrangement position of the junction box 12 is preferably arranged in the vicinity of the solar cell unit 11 arranged in parallel with the solar cell module 10, and in the end (10c, 10d) direction. It is preferable that the solar cell units 11 arranged in two stages along the extension are arranged on the extension between the stages. The wiring length for electrically connecting the junction box 12 and the plurality of solar cell units 11 can be shortened.

<< Detailed Configuration of Solar Cell Module 10 >>
If it is provided with the said structure, the various thing from which a specific structure differs can be used as the solar cell module 10. FIG. FIG. 3 is a diagram schematically showing a cross-sectional structure of a flexible solar cell module 10 applicable to the present embodiment.

As illustrated in FIG. 3, a solar cell module in which a weather-resistant protective film 14, a sealing material 15 a, a plurality of solar cell units 11, a sealing material 15 b, and a weather-resistant protective film 14 are laminated can be used. Moreover, you may provide other layers, such as a gas barrier layer, a getter material layer, and an ultraviolet cut layer, in an arbitrary place as needed. Furthermore, you may protect the edge part etc. of the solar cell module 10 using the sealing material which consists of polymer materials, such as a fluorine-type resin, a silicone resin, and an acrylic resin.

[Thickness of solar cell module 10]
The thickness of the solar cell module 10 is usually 0.5 mm or more, preferably 1 mm or more, and usually 5 mm or less, preferably 4 mm or less, more preferably 2 mm or less, and further preferably 1.5 mm or less. From the viewpoint of manufacturing cost and weight, it is preferable that the thickness of the solar cell module 10 is thin. However, if the thickness is too thin, the strength of the solar cell module 10 is lowered and easily damaged. In the present embodiment, a thickness of 2 mm or less is employed. This is to reduce the total weight because the length in the longitudinal direction of the solar cell module 10 exceeds 3000 mm when responding to a large diameter exceeding 1000 mm.

[Solar cell unit 11]
The solar cell element constituting the solar cell unit 11 is configured with a power generation layer (photoelectric conversion layer) sandwiched between a pair of positive and negative electrodes. Although there is no restriction | limiting in the kind of electric power generation layer, Thin film single crystal silicon, thin film polycrystalline silicon, amorphous silicon, an inorganic semiconductor material, a pigment | dye, an organic semiconductor material, etc. can be used. These are preferable because they have relatively high power generation efficiency and can reduce the weight of the thin film. In particular, since the solar cell unit 11 using an organic solar cell (organic thin film solar cell) using an organic semiconductor material can be bent along a curved wall surface of a cylindrical structure, along the curved surface. It is possible to attach so that it adheres. And it is more preferable at the point which can be greatly reduced in weight since it does not crack or crack even if it bends a little.

  The organic semiconductor material is composed of a p-type semiconductor and an n-type semiconductor. The p-type semiconductor is not particularly limited, and examples thereof include a low molecular material and a high molecular material. Examples of the low molecular weight material include condensed aromatic hydrocarbons such as naphthacene, pentacene, pyrene and fullerene; oligothiophenes containing 4 or more thiophene rings such as α-sexithiophene; thiophene ring, benzene ring, fluorene ring, Concatenated four or more naphthalene rings, anthracene rings, thiazole rings, thiadiazole rings, and benzothiazole rings; phthalocyanine compounds such as copper phthalocyanine, zinc phthalocyanine, and perfluorocopper phthalocyanine; porphyrin compounds such as tetrabenzoporphyrin and metal complexes thereof And macrocyclic compounds such as metal salts thereof.

  Examples of the polymer material include conjugated polymers such as polythiophene, polyfluorene, polythienylene vinylene, polyacetylene, and polyaniline; and polymer semiconductors such as alkyl-substituted oligothiophene.

  The n-type semiconductor is not particularly limited. For example, fullerene derivatives, quinolinol derivative metal complexes, condensed ring tetracarboxylic acid diimides, terpyridine metal complexes, tropolone metal complexes, flavonol metal complexes, perinone derivatives, benzimidazole derivatives, benzoxazole derivatives , Benzthiazole derivatives, oxadiazole derivatives, thiadiazole derivatives, triazole derivatives, aldazine derivatives, bisstyryl derivatives, pyrazine derivatives, phenanthroline derivatives, quinoxaline derivatives, benzoquinoline derivatives, bipyridine derivatives, condensed polycyclic aromatic total fluorides, single layers Examples include carbon nanotubes.

The positive electrode and the negative electrode sandwiching the power generation layer can be formed using one or more arbitrary materials having conductivity. For example, metals such as platinum, gold, silver, aluminum, chromium, nickel, copper, titanium, magnesium, calcium, barium, sodium, or alloys thereof; metal oxides such as indium oxide or tin oxide, or alloys thereof (ITO) A conductive polymer such as polyaniline, polypyrrole, polythiophene, polyacetylene; an acid such as hydrochloric acid, sulfuric acid, sulfonic acid, a Lewis acid such as FeCl3, a halogen atom such as iodine, a metal such as sodium or potassium; Examples include those containing a dopant such as atoms; conductive composite materials in which conductive particles such as metal particles, carbon black, fullerene, and carbon nanotubes are dispersed in a matrix such as a polymer binder.

  For the positive electrode, a material suitable for collecting electrons is preferably used. For example, an electrode material having a low work function such as Al is used. On the other hand, it is preferable to use a material suitable for collecting holes and electrons for the negative electrode. For example, an electrode material having a high work function such as Au or ITO. Two or more layers of these electrodes may be laminated. For example, electrical characteristics and wetting characteristics may be improved by surface treatment. The method for forming the electrode is not particularly limited. For example, the electrode can be formed by a dry process such as vacuum deposition or sputtering, or a wet process using a conductive ink. Any conductive ink can be used. For example, a conductive polymer, a metal particle dispersion, or the like can be used.

  Note that at least the electrode on the light-receiving surface side of the solar cell element is preferably transparent in order to transmit light used for power generation. If the electrode 41a is not transparent, for example, the area of the electrode 41a is smaller than the area of the power generation layer, the electrode 41a may not necessarily be transparent if it does not significantly adversely affect the power generation performance. As a transparent electrode material, for example, an oxide such as ITO or indium zinc oxide (IZO); a metal thin film can be used. Moreover, there is no restriction | limiting in the specific range of the light transmittance, However 80% or more is preferable when the electric power generation efficiency of a solar cell element is considered.

  When thin film polycrystalline silicon is used as the power generation layer, the thin film polycrystalline silicon solar cell element is a type of solar cell element that utilizes indirect optical transition. For this reason, in a thin film polycrystalline silicon solar cell element, it is preferable to provide sufficient light confinement structures, such as forming an uneven structure on the substrate or the surface, to increase light absorption. Thin film polycrystalline silicon can be formed on a substrate by a conventional method such as a CVD method.

  When amorphous silicon is used as the power generation layer, the amorphous silicon-based solar cell element is one in which the indirect optical transition in crystalline silicon becomes a direct transition due to structural disorder. The optical absorption coefficient in the visible region is large, and even a thin film having a thickness of about 1 μm has the advantage that it can sufficiently absorb sunlight. For this reason, even if it uses an amorphous silicon type solar cell element as a solar cell element, a lightweight solar cell panel is realizable. Further, since amorphous silicon is an amorphous material, it is resistant to deformation and can be made flexible.

A compound semiconductor solar cell element using an inorganic semiconductor material (compound semiconductor) as the power generation layer is preferable because of its high power generation efficiency. Of these, chalcogenide-based power generation layers containing chalcogen elements such as S, Se, and Te are preferable, and I-III-VI2 group semiconductor-based (chalcopyrite-based) power generation layers are preferable. In particular, Cu-III using Cu as the Group I element. The -VI2 group semiconductor power generation layer is theoretically preferable because it has extremely high photoelectric conversion efficiency. Of these, CIS semiconductors and CIGS semiconductors are particularly preferable. CIS-based semiconductor refers to CuIn (Se1-ySy) 2 (0≤y≤1).
GS semiconductor refers to Cu (In1-xGax) (Se1-ySy) 2 (0 <x <1, 0≤y≤1).
. A dye-sensitized power generation layer composed of, for example, a titanium oxide layer and an electrolyte layer is also preferable because of its high power generation efficiency. When the electrolyte is a liquid, the dye-sensitized solar cell is difficult to seal, particularly when the glass substrate is not used, and the durability may not be sufficient.

[Weather-resistant protective film 14]
The weather-resistant protective film 14 is a film for protecting the solar cell unit 11 from weather changes. Some of the constituent elements of the solar cell unit 11 are deteriorated by temperature change, humidity change, natural light, erosion caused by wind and rain, and the like. Therefore, it is desirable to cover the solar cell unit 11 with the weather-resistant protective film 14 to protect it from weather changes and the like so that the power generation capacity does not deteriorate.

  Since the weather-resistant protective film 14 is located on the outermost layer of the solar cell module 10, the solar cell module 10 (solar cell unit 11) such as weather resistance, heat resistance, transparency, water repellency, contamination resistance, mechanical strength, etc. It is preferable to have a property suitable as a surface coating material and to maintain it for a long period of time in outdoor exposure.

  Moreover, in order to ensure the flexibility which is rolled up in a longitudinal direction at the time of attachment work and is rounded, it is preferable that the weather-resistant protective film 14 is thin. Usually, it is 10 μm or more, preferably 15 μm or more, more preferably 20 μm or more, and is usually 200 μm or less, preferably 180 μm or less, more preferably 150 μm or less, and further preferably 100 μm or less. When the weather-resistant protective film 14 is thinned, the flexibility is increased, so that winding becomes easy. However, it is not preferable that the weather-resistant protective film 14 is too thin. This is because if the weather-resistant protective film 14 is too thin, weather resistance cannot be ensured.

  In addition, the weather-resistant protective film 14 is preferably one that transmits visible light from the viewpoint of not preventing the solar cell unit 11 from absorbing light. For example, the visible light (wavelength 360 to 830 nm) light transmittance of the weather-resistant protective film 14 is preferably 80% or more, more preferably 90% or more, and particularly preferably 95%.

  Furthermore, since the solar cell module 10 is often heated by receiving light, it is preferable that the weather-resistant protective film 14 also has heat resistance. From this viewpoint, the melting point of the constituent material of the weather resistant protective film 14 is usually 100 ° C. or higher, preferably 120 ° C. or higher, more preferably 130 ° C. or higher, and usually 350 ° C. or lower, preferably 320 ° C. or lower. Preferably it is 300 degrees C or less. By increasing the melting point, it is possible to reduce the possibility that the weather-resistant protective film 14 is melted and deteriorated when the solar cell module 10 is used.

  The material which comprises the weather-resistant protective film 14 is arbitrary if it can protect the solar cell unit 11 from a weather change. Examples of the material include polyethylene resin, polypropylene resin, cyclic polyolefin resin, AS (acrylonitrile-styrene) resin, ABS (acrylonitrile-butadiene-styrene) resin, polyvinyl chloride resin, fluorine resin, polyethylene terephthalate, polyethylene Examples thereof include polyester resins such as naphthalate, phenol resins, polyacrylic resins, polyamide resins such as various nylons, polyimide resins, polyamide-imide resins, polyurethane resins, cellulose resins, silicone resins, and polycarbonate resins.

  Among them, fluorine resin is preferable, and specific examples thereof include polytetrafluoroethylene (PTFE), 4-fluoroethylene-perchloroalkoxy copolymer (PFA), 4-fluoroethylene-6-fluoride. Propylene copolymer (FEP), 2-ethylene-4-fluoroethylene copolymer (ETFE), poly-3-fluoroethylene chloride (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), etc. Can be mentioned.

  In addition, the weather-resistant layer has functions such as ultraviolet blocking, heat blocking, antifouling, antifogging, abrasion resistance, conductivity, antireflection, antiglare, light diffusion, light scattering, wavelength conversion, gas barrier properties, etc. It may be given. In particular, since the solar cell module 10 is exposed to strong ultraviolet rays from sunlight, the weather resistant layer may have an ultraviolet blocking function. The UV blocking function can be achieved by laminating a layer having an UV blocking function on the weather resistant layer by coating film formation, etc., or by dissolving and dispersing a material that exhibits the UV blocking function. Can be applied to the weathering layer.

  In addition, the weather-resistant protective film 14 may be formed with 1 type of material, and may be formed with 2 or more types of materials. Moreover, although the weather-resistant protective film 12 may be formed with the single layer film, the laminated | multilayer film provided with the film of two or more layers may be sufficient as it. Furthermore, surface treatment such as corona treatment or plasma treatment may be performed to improve the adhesion with other films.

  The weather-resistant protective film 14 is preferably provided on the outer side of the solar cell module 10 as much as possible. This is because more of the constituent members of the solar cell module 10 can be protected. Therefore, it is preferable to provide the weather-resistant protective film 14 on the outermost surface of the solar cell module 10.

  Furthermore, in order to eliminate the possibility that the front surface 10e and the back surface 10f of the solar cell module 10 are bonded in a state of being rolled in the longitudinal direction and being rolled, the surface of the weather resistant protective film 14 may be embossed. In addition, the embossing of the surface 10e of the solar cell module 10 is also effective for making the solar cell module 10 unglaring when viewed from the outside.

[Encapsulant 15a]
The sealing material 15 a is a film that reinforces the solar cell unit 11. Since the solar cell unit 11 is thin, the strength is usually weak, and thus the strength of the solar cell module 10 tends to be weak. However, the strength can be maintained high by the sealing material 15a.

  Since the solar cell module 10 is wound in the longitudinal direction and rounded, the sealing material 15a is preferably thin. Usually, it is 50 μm or more, preferably 100 μm or more, more preferably 150 μm or more, and usually 500 μm or less, preferably 450 μm or less, more preferably 400 μm or less. Thinning increases flexibility and makes winding easier. However, if it is too thin, strength is not ensured, which is not preferable.

  Moreover, it is preferable that the sealing material 15a has high strength from the viewpoint of maintaining the strength of the solar cell module 10. The specific strength is related to the strength of the weather-resistant protective film 14 other than the sealing material 15a and is generally difficult to define. However, the sealing material 15a is used to round the solar cell module 10 or to fix and fix it. It is desirable to have adhesiveness and strength that do not cause peeling or deformation in each part of the solar cell module 10 even if it is sometimes extended.

  Further, the sealing material 15a is preferably one that transmits visible light from the viewpoint of not preventing the solar cell unit 11 from absorbing light. For example, the visible light (wavelength 360 to 830 nm) light transmittance of the sealing material 15a is usually 60% or more, preferably 70% or more, more preferably 75% or more, still more preferably 80% or more, and most preferably. It is 85% or more, particularly preferably 90% or more, particularly preferably 95% or more, and particularly preferably 97% or more. This is to convert more sunlight into electrical energy and improve power generation efficiency.

  Furthermore, since the solar cell module 10 is often heated by receiving light, it is preferable that the sealing material 15a also has heat resistance. From this viewpoint, the melting point of the constituent material of the sealing material 15a is usually 100 ° C. or higher, preferably 120 ° C. or higher, more preferably 130 ° C. or higher, and usually 350 ° C. or lower, preferably 320 ° C. or lower, more preferably. Is 300 ° C. or lower. By increasing the melting point, it is possible to reduce the possibility that the sealing material 15a is melted and deteriorated when the solar cell module 10 is operated.

Examples of the material constituting the sealing material 15a include ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), and ethylene. -Methyl methacrylate copolymer (EMMA), ethylene-methacrylic acid copolymer (EMAA), propylene / ethylene / α-olefin copolymer, ethylene / α-olefin copolymer, urethane resin, butyral resin, ionomer resin, Or a silicone resin etc. are mentioned.

  Moreover, the fluoropolymer which has tetrafluoroethylene (TFE), hexafluoropropylene (HFP), vinylidene fluoride (VdF) or tetrafluoroethylene (TFE), vinylidene fluoride (VdF) as a main component is also mentioned. Here, from the viewpoint of reducing damage to the solar cell element due to bending stress, a crosslinkable sealing material is preferable.

[Encapsulant 15b]
The sealing material 15b is a film similar to the sealing material 15a described above, and the same material as the sealing material 15a can be used in the same manner except that the arrangement position is different. The thickness is the same as that of the sealing material 15a. In addition, since the constituent member on the back surface 10f side that is in close contact with the wall surface of the structure 5 does not necessarily transmit visible light, the sealing material 15b may be one that does not transmit visible light.

[Recess (1a, 1b)]
FIG. 4 is a schematic cross-sectional view for explaining the recesses (1a, 1b) indicated by XX in FIG. The recesses (1a, 1b) are structures that define the winding position of the fixing bands (B1, B2). As illustrated in FIG. 4, the recesses (1 a, 1 b) with which the fixing band abuts are formed on the surface 10 e side of the solar cell module 10. The concave portion 1a is formed adjacent to the end portion 10a side, and the concave portion 1b is formed adjacent to the end portion 10b side. With this structure, the solar cell module 10 can be fixed at two locations that move up and down in the axial direction of the structure 5.

  Each of the recesses (1a, 1b) has a groove (2a, 2b) having a depth L1 in the thickness direction from the front surface 10e of the solar cell module 10 toward the back surface 10f. The groove 2a has a flat part with a width L2 in the direction of the end 10a, and the groove 2b has a flat part with a width L2 in the direction of the end 10b. Here, the width L2 of the flat portion included in the groove portions (2a, 2b) may be any as long as the width of the fixing band can be accommodated. In this embodiment, it has a flat part of 24 mm-26 mm. The width L2 of the flat portion is formed to have a width value common to the groove portions (2a, 2b). For example, the width L2 ′ is different from the width L2 of the groove portion 2a formed in the end portion 10a side direction. May be provided in the groove 2b formed in the direction of the end 10b. The solar cell module 10 provided with the recessed part (1a, 1b) according to the installation environment, the work environment at the time of attachment fixation, etc. can be provided.

  The depth L1 of the recesses (1a, 1b) is preferably formed in accordance with the strength of the weatherproof protective film 14 and the sealing material (15a, 15b). In this embodiment, from the strength relationship with the solar cell module 10 thickness, it is preferable that the range is 0.1 mm ≦ L1 (mm) ≦ 1.5 mm. Moreover, it is preferable to form it so that it may have the depth L1 of 50 percent or less as compared with the solar cell module 10 thickness.

  The recesses (1a, 1b) have wall portions (3a, 3b) that are rising from the groove portions (2a, 2b) in the direction of the surface 10e. The wall portions (3 a, 3 b) are groove wall surfaces on the side of the end portion 10 a of the solar cell module 10. The angle i formed by the wall portions (3a, 3b) and the groove portions (2a, 2b) is preferably 90 degrees ≦ i ≦ 100 degrees. This is for the purpose of heat release of the fixing band that has been stored by sunlight in a state in which a feeling of wearing by the fixing band at the time of installation work is left.

[Dimensions]
The dimensional relationship with which the solar cell module 10 is provided is demonstrated using FIG. FIG. 5 is an explanatory diagram of the dimensional relationship that the solar cell module 10 includes. In FIG. 5, the length G (mm) in the longitudinal direction in which a plurality of solar cell units are arranged side by side is as follows in order to ensure a wide light receiving region while being wound around the columnar structure 5. Have
(Π × φ) / 2 ≦ G ≦ (π × φ) × 2/3 (1)
φ: Diameter of pipe material (mm)
π: Constant G: Parallel length of solar cell units (mm)
In addition, about a light reception area | region, it mentions later by the attachment method of a solar cell module.

  The length F (mm) in the longitudinal direction of the solar cell module 10 may be a length that can secure at least the juxtaposed length G of the solar cell units. In the present embodiment, considering the flexibility of the solar cell module 10, workability at the time of installation, the diameter of the wound structure, etc., margin lengths of about 500 mm to 600 mm in the end (10c, 10d) direction, respectively. (E1, E2) are provided. Therefore, the length F in the longitudinal direction is a length obtained by adding the margin lengths E1 and E2 to the parallel arrangement length G of the solar cell units. The margin lengths (E1, E2) can be adjusted according to the installation environment of the solar cell module 10. In the present embodiment, in order to adjust the arrangement position of the junction box 12, E2 <E1.

  The same applies to the length H (mm) in the short direction of the solar cell module 10 as long as at least the solar cell unit 11 can be disposed. In this embodiment, since the recesses (1a, 1b) are formed between the end portions (10a, 10b) and the plurality of solar cell units 11 arranged in parallel, a margin length of about 50 mm to 60 mm is formed. (K1, K2) are provided. Accordingly, the length H in the short direction is a length obtained by adding the margin lengths K1 and K2 to the length in the longitudinal direction of the solar cell unit 11. Note that the length H in the short direction depends on the size of the solar cell unit 11 to be arranged, but considering the workability at the time of winding and fixing, the length of about 550 mm to 650 mm, which is about the shoulder width of the worker. Is preferable.

  In the present embodiment, the margin lengths (K1, K2) are K2 <K1. This is because an installation environment in which the structure 5 is wound and fixed is taken into consideration. Specifically, the distance K3 between the concave portion 1a and the solar cell unit 11 arranged in parallel on the end portion 10a side, and the solar cell unit 11 arranged in parallel on the concave portion 1b and end portion 10b side. The separation distance K4 is K4 <K3. This is for avoiding the shielding of sunlight by the fixing bands (B1, B2). Further, the separation distance K5 between the end portion 10a and the recess 1a and the separation distance K6 between the end portion 10b and the recess 1b satisfy K6 <K5. This is to prevent droplets such as fog and haze adhering to the wall surface of the structure 5.

<Method of mounting solar cell module 10>
First, the light receiving area of the solar cell module 10 will be described with reference to FIG. FIG. 6 is a cross-sectional view schematically illustrating a state in which the solar cell module is wound around the curved wall surface of the cylindrical structure 5, and is a cross-sectional view in the radial direction viewed from the upper side in the axial direction. As shown in FIG. 6, the flexible solar cell module 10 of the present embodiment is wound with the back surface 10 f in close contact with a cylindrical curved wall surface. The incident range of sunlight expands in a fan shape from the east side to the west side, with the south direction as the center, due to changes over time and changes over time. The arrangement area of the solar cell unit 11 adjusted according to the incident range is a light receiving area. The light receiving region is adjusted so as to suppress as much as possible the power fluctuations of the generated power caused by the above-mentioned daily changes and sunshine fluctuations accompanying the aging changes.

In FIG. 6, a region range indicated by a fan-shaped angle D is a light receiving region, and is a region where a plurality of solar cell units 11 are arranged in parallel. 5, the parallel arrangement length G of the solar cell units in the longitudinal direction of the solar cell module 10 is formed. The angle D is preferably 180 degrees ≦ D ≦ 240 degrees. If it is this angle range, the electric power fluctuation | variation of the generated electric power which arises from the daylight change accompanying a secular change and a secular change can be suppressed as much as possible.

  For example, in terms of changes over time, the incident range of sunlight incident in time with sunrise is a range of coarse 180 degrees developed to the south side and the north side around the east direction. In this state, the range from 180 degrees is developed in the east and west with the south direction as the center and the incident range of sunlight. And in the sunset, the range of the coarse 180 degree | times developed to the south side and the north side centering on the west direction is the incident range of sunlight. Therefore, if the light receiving region is developed in a fan shape from the east side to the west side centering on the south direction in which the sun goes south, it is possible to obtain the generated power continuously at least in the time zone where solar radiation exists.

  7A, 7B, and 7C are schematic diagrams in which the solar cell module 10 is wound around the structure 5. FIG. As shown in FIG. 7A, the end portion 10c and the end portion 10d of the wound solar cell module 10 face each other in the north direction of the structure 5. By diagonally winding the solar cell module 10 by aligning the positions of the grooves (2a, 2b) of the recesses (1a, 1b) of the opposing ends (10c, 10d) on the surface 10e so as to be horizontal to each other. Can be prevented. Moreover, the fine position shift resulting from the partial bending, distortion, etc. of the wound solar cell module 10 can be adjusted. Therefore, since the clearance gap which arises between the wall surface by diagonal winding etc. and the back surface 10f of the solar cell module 10 can be suppressed, the adhesiveness at the time of attachment fixation improves.

  Since the recess 1a and the recess 1b are formed so as to be parallel to the surface 10e of the planar solar cell module 10, the positions of the grooves (2a, 2b) of the end portions (10c, 10d) in the wound state are set. By matching, it becomes a pair of grooves parallel to the axial direction along the wall surface of the structure 5. In this state, the fixing bands (B1, B2) are wound from above according to the positions of the grooves (2a, 2b) of the recesses (1a, 1b). The wound fixing bands (B1, B2) are fastened to the wall surface together with the solar cell module 10 and fixed by a fastener.

  In the schematic diagram shown in FIG. 7A, the length F in the longitudinal direction of the solar cell module 10 wound around the structure 5 is roughly the same as the length in the circumferential direction of the structure 5. In many cases, such as the schematic diagram shown in FIG. In this case, a separation distance is generated between the end portions 10c and 10d that are wound around the structure 5 and face each other. In this case, for example, the auxiliary member 6 used as a backing plate can be used for fixing. As the auxiliary member 6, for example, the weather-resistant protective film 14 used in the solar cell module can be used.

  The solar cell module 10 is provided with the already described margin lengths (E1, E2) in the longitudinal direction and on the end (10c, 10d) side. The auxiliary member 6 covers the separation distance between the end portions 10c and 10d, and can be fixed in contact with the surface 10e side of the region where the solar cell unit 11 is not disposed. In the fixing using the auxiliary member 6, for example, an adhesive can be applied to the regions (6 a and 6 b) that are in contact with and overlap the auxiliary member 6, and the auxiliary member 6 can be bonded from the surface 10 e side. This is because the use of the adhesive does not reach the structure 5. In this state, it goes without saying that the fixing bands (B1, B2) are wound around and fixed to the concave portions (1a, 1b) that form a parallel pair vertically.

  The schematic diagram shown in FIG. 7C is a schematic diagram when, for example, a plurality of the solar cell modules 10 shown in FIG. 7A are used. The solar cell module (# 1- 10, # 2-10). Thus, when a plurality of solar cell modules are used, it is possible to form a solar cell module system 20 including a plurality of solar cell modules. It is possible to provide a power supply system using a solar cell module in accordance with a power supply request of a power receiving side device or a power receiving side system that receives power supply.

  In FIG. 7C, the lower solar cell module # 2-10 is wound around the structure 5 in a state where the ends # 2-10c and # 2-10d are combined. In a state where the end portions # 2-10c and # 2-10d are combined, the recess # 2-1a formed in the surface # 2-10e is a single continuous groove. Similarly, the recess # 2-1b is also a single continuous groove and forms a parallel pair with the groove formed by the recess # 2-1a.

  The solar cell module # 1-10 disposed on the upper side has the concave portion # 1-1b with reference to the groove position formed by the concave portion # 2-10a of the solar cell module # 2-10 disposed on the lower side. Is superimposed on the position of the recess # 2-10a and wound from the surface side of the solar cell module # 2-10. In this way, a part of the solar cell module # 2-10 wound on the lower side is overlapped, and the solar cell module # 1-10 is wound and fixed on the upper side, thereby retaining the dust in the overlapped portion. Can be prevented. Further, for example, in rainy weather, the flow of rain or the like flowing on the surface of each solar cell module can be improved, and the weather resistance of the solar cell module system 20 can be improved.

  Since solar cell module # 1-10 wound upward in the normal direction of structure 5 has a slight gap between its ends # 1-10c and # 1-10d, FIG. It is preferable to fix using the auxiliary member 6 as shown in 2). In this case, as shown in FIG. 7C, the auxiliary member 6 includes solar cell modules # 1-10 wound on the upper side (# 1-10c, # 1-10d) and solar cells wound on the lower side. A plate shape that integrally covers and connects the end portions (# 2-10c, # 2-10d) of the module # 2-10 is preferable. The weather resistance of the solar cell module system 20 can be improved.

  As described above, the fixing form using the auxiliary member 6 is applied to the regions of the solar cell modules # 1-10 and # 2-10 which are in contact with and overlap the auxiliary member 6, and the auxiliary member 6 is placed on the surface. It is possible to bond from the # 1-10e and # 2-10e sides. In this state, the fixing band # 1-B1 is wound and fixed in accordance with the position defined by the recess # 1-1a. Then, the fixing band # 2-B1 (or # 1-B2) is adjusted according to the position defined in the recess # 1-1b, and the fixing band # 2-B2 is adjusted according to the position defined in the recess # 2-1b. By winding, a solar cell module system 20 in which a plurality of solar cell modules 10 are connected and connected can be realized.

  7C shows an example in which the solar cell modules # 1-10 and # 2-10 having the same length in the longitudinal direction (circumferential direction) are arranged in the axial direction of the cylinder, but the solar cell module # 1 is shown. As for −10, as a result of being overlaid on the solar cell module # 2-10, a gap is formed between both end portions # 1-10c and 1-10d due to the influence of the thickness of the solar cell module # 2-10 Is an exaggerated expression. Naturally, a plurality of solar cell modules 10 having different lengths in the longitudinal direction may be used. In particular, the length in the longitudinal direction of the solar cell module 10 (for example, # 1-10) to be stacked on the other solar cell module 10 is set to be longer than the length in the longitudinal direction of the other solar cell module 10 (for example, # 2-10) to be stacked. You may lengthen it considering the thickness of 2-10. The same applies to FIG. 10A described later.

  Moreover, it is possible to provide the cross-sectional structure shown in FIG. 8 as a modification of the solar cell module 10 for attaching. FIG. 8 is a schematic cross-sectional view taken along the line XX in FIG. The difference from the schematic cross-sectional view illustrated in FIG. 4 is that the solar cell module 10 includes convex portions (1c, 1d) protruding toward the back surface 10f. This convex part (1c, 1d) is a protrusion structure which can be overlapped with the concave part (1a, 1b) formed in the surface 10e of the solar cell module.

  The convex portions (1c, 1d) are formed on the back surface 10f side facing the formation position of the concave portions (1a, 1b) formed on the front surface 10e side. The concave portion 1a and the convex portion 1c face each other, and the concave portion 1b and the convex portion 1d face each other. The protrusion 1c is a protrusion structure having a rectangular cross section and having a height L3 protruding from the surface 10f of the solar module 10 in the thickness direction and from the surface 10e toward the back surface 10f. The convex portion 1c is further formed to have a flat portion 2c substantially parallel to the groove portion 2a. Similarly to the convex portion 1c, the convex portion 1d is a projection structure having a height L3 projecting from the front surface 10e toward the rear surface 10f and having a rectangular section, and is formed to have a flat portion 2c substantially parallel to the groove portion 2a. The The protruding height L3 is formed in common with the convex portions (1c, 1d). For example, the protruding height L3 of the convex portion 1c is equal to the height L3 ′ of the convex portion 1d. They may be formed at different heights. The protruding height L3 of the convex portions (1c, 1d) preferably has a relationship of L3 <L1 in relation to the depth L1 of the concave portions (1a, 1b) formed at the opposing positions. . The overlapping of the convex portions (1c, 1d) and the concave portions (1a, 1b) becomes easy.

  The flat portion 2c substantially parallel to the groove portion 2a has a width L4 in the direction of the end portion 10a, and is formed to have a width L4 in the direction of the end portion 10a in the same manner as the flat portion 2d substantially parallel to the groove portion 2b. The width L4 of the flat portions (2c, 2d) of the convex portions (1c, 1d) is related to the width L2 of the groove portions (2a, 2b) of the concave portions (1a, 1b) formed at the opposing positions. , L4 <L2 is preferable. This is because the overlapping of the convex portions (1c, 1d) and the concave portions (1a, 1b) is made smooth. For example, the common width L4 of the convex portions (1c, 1d) may be formed such that the width L4 of the convex portion 1c is different from the width L4 ′ of the convex portion 1d. As shown in the figure, each of the convex portions 1c, 1d is provided at a position corresponding to the concave portions 1a, 1b on the back surface of the solar cell module 10, but there may be one convex portion. Moreover, the convex part does not need to be continuously formed in the longitudinal direction of the solar cell module 10 on the back surface, and may be formed intermittently. Moreover, the formation position of the short part direction in the solar cell module 10 of a convex part may have shifted | deviated from the short direction direction position of the recessed part formed in the surface.

  FIGS. 9 and 10 are schematic views in which a solar cell module 10 having a modified cross-sectional structure is wound around a structure (column) 5. As schematically shown in FIG. 9, a method of attaching the solar cell module 10 to the structure 5 in which the margin lengths (E1, E2) are overlapped with each other can be provided. As shown in FIG. 9 (1), the solar cell module 10 wound around the wall surface of the structure 5 is overlapped and wound with the end portion 10d side on the upper side and the end portion 10c side on the lower side. . Then, as shown in the schematic attachment cross-sectional view of FIG. 9 (2), in this winding state, the upper convex portions (1c, 1d) overlap the lower concave portions (1a, 1d) with their formation positions. Is attached. In the overlapping margin length (E1, E2) portion of the solar cell module 10, the lower surface 10e and the upper back surface 10f are in contact with each other. In this state, the fixing band (B1, B2) is wound around and fixed to the concave portions (1a, 1b) that form a parallel pair in the vertical direction, thereby fixing the solar cell module 10 without using the auxiliary member 6 shown in FIG. 7B. Mounting and fixing can be performed. In addition, as in FIG. 7B, the contact surfaces with overlapping margin lengths (E1, E2) can be bonded with an adhesive.

FIG. 10 is a schematic diagram of the solar cell module system 20. In FIG. 10A, the solar cell module system 20 is one in which a solar cell module # 1-10 and a solar cell module # 2-10 are overlapped in two stages up and down. The lower solar cell module # 2-10 includes # 2 recesses (1a, 1b) formed on the surface # 2-10e, and the upper solar cell module # 1-10 is formed on the surface # 1-10e. # 1 concave portions (1a, 1b) and # 1 convex portions (1c, 1d) formed on the back surface # 1-10f. In FIG. 10A, the recess # 2-1a on the end # 2-10a side formed on the surface # 2-10e of the lower solar cell module # 2-10, and the upper solar cell module # 1. The convex part # 1-1c formed on the back surface # 1-10f of −10 is overlapped and wound. As shown in the schematic mounting cross-sectional view of FIG. 10B, in this winding state, the lower concave portion # 2-1a is the lower side in the normal direction, and the upper convex portion # 1-1c is the normal line. It is wound with the formation position overlapped with the upper side in the direction. In this state, three fixed bands # 1-B1, # 2-B1 (or # 1-B2) are formed in accordance with the formation positions of the concave portions # 1-1a, # 1-1b, # 2-1b that are parallel in the vertical direction. The solar cell module system 20 in which the solar cell modules 10 are arranged in two stages vertically in the axial direction can be fixed by winding and fixing # 2-B2.

  In addition, as shown to Fig.10 (a), solar cell module # 2-10 arrange | positioned upwards in the axial direction of the structure 5 is solar cell module # 2- arrange | positioned downward in an axial direction. It is arranged on the upper side in the direction of 10 normals. For this reason, if the length F of the longitudinal direction with which each solar cell module 10 is made equal, edge part # 1-10c and # 1-10d of solar cell module # 1-10 arrange | positioned upwards in a normal line direction There will be a slight gap between the two. Therefore, a fixing method using the auxiliary member 6 as illustrated in FIG. 7B and a fixing method in which parts of the margin lengths (E1, E2) are overlapped with each other as illustrated in FIG. 9 are preferable. The weather resistance of the solar cell module system 20 in which a plurality of solar cell modules 10 are connected vertically is improved.

[Method for Manufacturing Solar Cell Module 10]
The solar cell module 10 can be manufactured by various methods. For example, the solar cell unit of the type shown in FIG. 3 is generally composed of one or two or more solar cell units 11 connected in series or in parallel between the weather-resistant protective films 14 together with the sealing materials 15a and 15b. It can manufacture by laminating with a typical vacuum laminating apparatus. In addition, the solar cell unit of the type shown in FIG. 3 can be laminated by simultaneously laminating an ultraviolet cut layer, a gas barrier layer, a getter material layer, or the like at the time of laminating as described above, or by laminating several films separately. Can be manufactured.

  At this time, the heating temperature is usually 130 ° C. or higher, preferably 140 ° C. or higher, and is usually 180 ° C. or lower, preferably 170 ° C. or lower. The heating time is usually 10 minutes or longer, preferably 20 minutes or longer, usually 100 minutes or shorter, preferably 90 minutes or shorter. The pressure is usually 0.001 MPa or more, preferably 0.01 MPa or more, and usually 0.2 MPa or less, preferably 0.1 MPa or less. By setting the pressure within this range, sealing can be reliably performed, and the sealing materials 15a and 15b from the end portions can be prevented from protruding and over-pressurized to reduce film thickness, thereby ensuring dimensional stability.

[Method of forming concave portions (1a, 1b) and convex portions (1c, 1d)]
FIG. 11A illustrates a method for forming the recesses (1a, 1b). FIG. 11A is an explanatory diagram using mold materials (13a, 13b) for forming the recesses (1a, 1b). The formation of the recesses (1a, 1b) is performed at the time of laminating the solar cell module 10 described above. As illustrated in FIG. 11A, mold materials (13a, 13b) capable of forming the groove portions (2a, 2b) are formed in contact with the surface 10e side. As described above, the contact positions of the mold members (13a, 13b) may satisfy any of the formation position relationships illustrated in FIGS. 2, 4, 5, etc. (FIG. 11A (1)). The mold material (13a, 13b) brought into contact with the surface 10e is pressed with the progress of the laminating process to form a mold according to the shape of the mold material (13a, 13b) on the surface 10e. 10 are laminated together (FIGS. 11A (2) to (3)). After the laminating process, the molds (13a, 13b) pressed and embedded in the solar cell module 10 are peeled off (FIG. 11A (4)). Through this process, a pair of parallel recesses (1a, 1b) is formed on the surface 10e of the solar cell module 10. The wall portions (3a, 3b) shown in FIGS. 4 and 8 preferably have an inclination angle within the above-described range. Moreover, you may give the inclination which becomes a taper shape from the surface 10e to a groove part (2a, 2b) for the peeling process of a mold material (13a, 13b).

  The mold material (13a, 13b) may be any material that can form the groove (2a, 2b) on the surface 10e of the solar cell module 10 during the formation of the recess (1a, 1b). What is necessary is just a thing which is not melt | fused with the weather-resistant protective film 14 which comprises the surface layer of the battery module 10. FIG. As an example, a glass cloth which is a glass fiber cloth material can be used. The solar cell module 10 can be extended and arranged in the longitudinal direction, and is not fused to the weather-resistant protective film 14. The mold members (13a, 13b) can be peeled off without damaging the surface 10e of the solar cell module 10 due to fusion.

  FIG. 11B is an explanatory diagram using mold materials (13c, 13d, 13e) for forming the convex portions (1c, 1d). The convex portions (1c, 1d) are also formed when the solar cell module 10 is laminated. With the mold materials (13a, 13b) for forming the recesses (1a, 1b) in contact with the front surface 10e, the mold materials (13c, 13d, 13e) are further brought into contact with the back surface 10f. As described above, the contact positions of the mold members (13c, 13d, 13e) may satisfy the formation positional relationship illustrated in FIG. 2, FIG. 4, FIG. 5, FIG. )). The mold materials (13c, 13d, 13e) brought into contact with the back surface 10f are pressed as the laminating process progresses, and while forming a pressing mold that matches the shape of the mold materials (13c, 13d, 13e) on the back surface 10f, It is laminated together with the solar cell module 10 (FIGS. 11B (2) to (3)). After the laminating process, the molds (13c, 13d, 13e) that are pressed and embedded in the solar cell module 10 are peeled off (FIG. 11B (4)). By this process, convex portions (1c, 1d) facing the pair of parallel concave portions (1a, 1b) are formed on the back surface 10f of the solar cell module 10. The rise of the protrusions (1c, 1d) protruding from the back surface 10f is caused by a taper-like inclination from the back surface 10f to the flat portions (2c, 2d) due to the peeling process of the mold materials (13c, 13d, 13e). good.

  As the mold materials (13c, 13d, 13e), a glass cloth which is the same material as the mold materials (13a, 13b) for forming the recesses (1a, 1b) can be used. The mold materials (13c, 13d, 13e) can be peeled off from the back surface 10f of the solar cell module 10 without causing damage due to fusion.

1a, 1b. Recess, 1c, 1d. Convex part, 2a, 2b. Groove,
3a, 3b. 4. walls, A cylindrical structure, 6. Auxiliary member (connecting material),
10. Solar cell module, 10a, 10b, 10c, 10d. edge,
10e. Surface, 10f. Backside,
11. Solar cell unit, 12. Junction box,
13a, 13b, 13c, 13d, 13e. Mold material, 14. Weatherproof protective film,
15a, 15b. Sealing material,
20. Solar cell module system,
L1. Depth, L2. Width, L3. Protrusion height, L4. width

Claims (11)

A solar cell module having a front surface and a back surface, the solar cell module being attached to the column by winding a fixing band around the column from the upper side of the surface in a state where the back surface is in contact with a peripheral surface of the column;
A rectangular plate-like flexible resin substrate having a first direction arranged in the axial direction of the cylinder and a second direction arranged in the circumferential direction of the cylinder perpendicular to the axial direction; ,
A thin-film solar cell provided on the resin base plate,
At least two recesses that are formed in parallel with the second direction on the surface and that define a winding position of the fixing band;
Including solar cell module.   The solar cell module is attached to the cylinder having a diameter exceeding 1000 mm.
The solar cell module according to claim 1. The at least two recesses are formed in a laminating process in which the thin film solar cell is provided on the resin substrate.
The solar cell module according to claim 1 or 2. The length G [mm] in the second direction of the portion where the thin film solar cell is provided on the resin substrate satisfies the following expression.
The solar cell module of any one of Claim 1 to 3.
(Π × φ) / 2 ≦ G ≦ (π × φ) × 2/3
  Where φ is the diameter of the cylinder [mm] and π is a constant The solar cell module according to any one of claims 1 to 4, wherein a depth of the concave portion is 0.1 mm or more and 1.5 mm or less. The solar cell module according to any one of claims 1 to 5, wherein a depth of the concave portion is 50% or less of a thickness of the solar cell module. The said back surface further contains at least 1 convex part inserted in one of the said at least 2 recessed part which the other solar cell module arrange | positioned adjacent to the axial direction of the said cylinder has. The solar cell module according to. A rectangular plate-like flexible resin substrate having a first direction arranged in the axial direction of a cylinder and a second direction arranged in the circumferential direction of the cylinder perpendicular to the axial direction; a thin-film solar cell provided on the resin base plate, the formed parallel to the second direction at the surface, a solar cell module comprising at least two recesses defining a winding position of the fixing band , Wrapped around the cylinder,
Wound in a state where the fixing band is inserted into each recess,
A method for attaching a solar cell module, comprising fixing the solar cell module to the column by tightening the fixing band. When the length of the solar cell module in the second direction is shorter than the circumferential length of the column, both ends in the short direction of the solar cell module in a state of being wound around the column are connected via a plate-shaped connecting material. And the entire circumferential surface of the cylinder between the both ends in the circumferential direction of the cylinder is covered with the connecting material,
The solar cell module mounting method according to claim 8 , wherein the solar cell module having a cylindrical shape by the connecting member is fixed by the fixing band. The solar cell module is wound around the cylinder having a diameter exceeding 1000 mm.
The method for attaching the solar cell module according to claim 8 or 9. As the solar cell module, a solar cell module in which a length G [mm] in the second direction of a portion where the thin film solar cell is provided on the resin substrate satisfies the following formula is used.
The attachment method of the solar cell module of any one of Claims 8 to 10.
(Π × φ) / 2 ≦ G ≦ (π × φ) × 2/3
  Where φ is the diameter of the cylinder [mm] and π is a constant

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