JP2013030734A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module capable of withstanding stress concentration on a solar cell generated, particularly during cooling, in forming a solar cell module, having high power generation efficiency, and preventing deterioration of the appearance of the solar cell module used for various applications (buildings and automobiles) without breaking or cracking the solar cells.SOLUTION: A reinforcing layer, such as a metal thin film, is formed between a front-face protective layer and a rear-face protective layer, thereby to solve the problem. Particularly, it is desirable that the coefficient of linear expansion of the reinforcing layer is smaller than those of the front-face protective layer and the rea-face protective layer and the Young's modulus of the reinforcing layer is not less than those of the front-face protective layer and the rea-face protective layer.

Description

  The present invention relates to a method for manufacturing a solar cell module.

As a solar cell, for example, a solar cell using single crystal silicon or polycrystalline silicon is known.
These solar cells normally constitute a solar cell module in a state of being sealed between protective members (protective layer) with a sealing material such as EVA resin. Specifically, these solar cell modules sandwich a photoelectric conversion layer in which a plurality of solar cells are connected with an electric wire or the like between protective layers such as a surface protective layer and a back surface protective layer, wrapped in an EVA resin film, Generally, the entire module is vacuum-produced by heating and pressing with a vacuum laminator.

  In recent years, polycarbonate has been adopted as a material for the protective layer in order to reduce the weight of the solar cell module and improve the transparency and mechanical strength. For example, Patent Document 1 describes a solar cell module in which a glass filler-containing polycarbonate resin molded product including a polycarbonate resin and a glass filler is used as a protective layer.

  On the other hand, when polycarbonate resin is used for the protective layer, it has a smaller rigidity and larger linear expansion coefficient than conventional glass, so in the process of heat-pressure molding with a vacuum laminator together with the photoelectric conversion layer and the sealing material, The problem that the battery module is deformed by thermal stress and a non-defective product is obtained, or the risk of damaging the photoelectric conversion layer with a relatively small linear expansion coefficient due to large expansion and contraction of the protective layer when the operating environment temperature changes greatly. was there. For this reason, in Patent Document 2, a soft resin protective layer such as an acrylic resin, a polyvinyl fluoride resin (PVF), or a polyvinylidene fluoride resin (PVDF) is further provided between the protective layer and the photoelectric conversion layer. It is described that by providing a resin protective layer, the internal thermal stress of the polycarbonate generated in the photoelectric conversion layer via the sealing material can be removed, and a solar cell module that is light in weight and excellent in impact resistance can be obtained. ing.

JP 2009-88072 A JP 2002-1111014 A

  Usually, a solar cell module heated and pressed by a vacuum laminator is cooled naturally in the vacuum laminator or by taking it out from the vacuum laminator. No particular mention is made of the state of. When the inventors examined in detail, during the cooling, the solar cells and the collector wires connecting them are subjected to heat shrinkage stress from the resin layers such as the surface protective layer and the back surface protective layer, and the solar cells are damaged. Or a problem that a crack occurs in the solar cell.

The present invention solves the above-described problem, and the protective layer expands and contracts greatly when the solar cell module is molded, particularly when the shrinkage stress generated during cooling after the laminate molding and the operating environment temperature change are large. It can withstand the expansion and contraction stress generated by the solar cell, the solar cell does not break, the solar cell does not crack, has sufficient power generation efficiency, and has various applications (buildings and automobiles) It aims at providing the solar cell module which does not impair the external appearance as a solar cell module used for.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have inherent Young's modulus and linear expansion coefficient of the surface protective layer, the back surface protective layer, and the photoelectric conversion layer, and are generated when the surface protective layer and the back surface protective layer are cooled. We focused on the correlation with thermal shrinkage stress. And, by having a reinforcing layer that hardly causes a shape change with respect to heat shrinkage stress acting on the photoelectric conversion layer, between the surface protective layer and the back surface protective layer, particularly between the photoelectric conversion layer and the back surface protective layer, It has been found that the above problems can be solved, and the present invention has been completed. That is, the gist of the present invention is a solar cell module having a photoelectric conversion layer and a reinforcing layer between a surface protective layer and a back surface protective layer, wherein the reinforcing layer has a linear expansion coefficient of the surface protective layer and the back surface protective layer. The solar cell module is characterized in that the Young's modulus is smaller than the linear expansion coefficient of the layer, and the Young's modulus is equal to or higher than the Young's modulus of the surface protective layer and the back surface protective layer.

  Further, the reinforcing layer preferably has a linear expansion coefficient at −30 to 30 ° C. of 40 ppm / K or less and a Young's modulus at 23 ° C. of 6 GPa or more. It is preferable that the linear expansion coefficient in 30-30 degreeC is 50 ppm / K or more, and the Young's modulus in 23 degreeC is 5 GPa or less.

  The area of the laminated surface of the reinforcing layer is preferably the same as or smaller than the area of the laminated surface of the surface protective layer and the back protective layer, and is the same as the area of the laminated surface of the photoelectric conversion layer Or it is preferable that the area of the lamination surface of the reinforcing layer is larger than that.

  The material of the reinforcing layer is preferably one or more selected from metal, metal oxide, glass and stretched polyester resin sheet, and the photoelectric conversion layer has a linear expansion coefficient at −30 to 30 ° C. of 40 ppm. / K or less is preferable.

  Further, when the material of the reinforcing layer has conductivity, it is preferable to further have an electrical insulating layer between the photoelectric conversion layer and the reinforcing layer, from the solar light receiving surface side, a surface protective layer, a photoelectric conversion layer, It is preferable to laminate | stack in order of an electric insulation layer, a reinforcement layer, and a back surface protective layer.

  Moreover, it is preferable that the said reinforcement layer can be provided between the said back surface protective layer and the said photoelectric converting layer, and the said reinforcing layer exists further between the said photoelectric converting layer and the said surface protective layer.

  Moreover, the minimum curvature radius R is 10,000 mm or less, and it can be curved in the biaxial direction, and the solar cell module of the present invention can be used as a vehicle member.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which prevents the crack of a photoelectric converting layer (solar cell) and the disconnection of a bus bar can be provided by reducing the thermal contraction stress from a resin layer to a photoelectric converting layer.

It is a schematic diagram of one embodiment of the solar cell module of the present invention (Example 1). It is a schematic diagram of one embodiment of the solar cell module of the present invention (Example 2). It is a schematic diagram of the conventional embodiment of a solar cell module (comparative example 1). It is a schematic diagram of the conventional embodiment of a solar cell module (comparative example 2). It is a schematic diagram of one embodiment of the solar cell module of the present invention (Example 3). It is a schematic diagram of one embodiment of the solar cell module of the present invention (Example 4). It is a schematic diagram of one embodiment of the solar cell module of the present invention (Example 5). It is a schematic diagram of one embodiment of the solar cell module of the present invention (Example 6).

Embodiments of the solar cell module of the present invention will be specifically described below.
The solar cell module of this invention has a photoelectric converting layer and a reinforcement layer laminated | stacked between a surface protective layer and a back surface protective layer. By using a resin substrate instead of a glass substrate, the solar cell module can provide a lightweight and inexpensive solar cell module. A solar cell module using such a resin substrate is generally manufactured by thermal lamination, but the resin layer is thermally contracted during cooling, and the solar cell (photoelectric conversion layer) is damaged by the stress. There was a crack. In the solar cell module of the present invention, a reinforcing layer having specific properties is laminated between the front surface protective layer and the rear surface protective layer, which are resin substrates, so that such damage to the solar cells or bus bar (interconnector) ) Is prevented from occurring.

<Surface protective layer>
The surface protective layer of the present invention is a layer for imparting mechanical strength, weather resistance, scratch resistance, chemical resistance, gas barrier properties and the like to the solar cell module. As the surface protective layer, a resin (hereinafter sometimes referred to as “resin (A)”) is used. From the viewpoint of supplying a large amount of sunlight to the photoelectric conversion layer, the total light transmittance of the resin (A) is 80% or more, preferably 90% or more. The measuring method of a total light transmittance is based on JISK7361-1, for example.

  Examples of the resin (A) used for the surface protective layer include polycarbonate (PC), polymethyl methacrylate (PMMA), cyclic polyolefin, polystyrene, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and ethylene-tetrafluoroethylene copolymer. Examples thereof include a polymer (ETFE), polytetrafluoroethylene (PTFE), polypropylene (PP), and polyethylene (PE). Preferably, polycarbonate (PC) resin, polymethyl methacrylate (PMMA), etc. are mentioned. The surface protective layer may have a multilayer structure using a plurality of these resins. In that case, it is preferable to fuse the layers by a heat-sealing method or to provide a sealing material layer.

  Moreover, it is preferable that the linear expansion coefficient in -30-30 degreeC of resin (A) is 50 ppm / K or more, More preferably, it is 55 ppm / K or more, More preferably, it is 60 ppm / K or more. The linear expansion coefficient is measured by, for example, ASTM D696. When the linear expansion coefficient is less than 50 ppm / K, thermal expansion / contraction stress that requires a reinforcing layer tends not to occur. On the other hand, the upper limit is not particularly limited, but is usually 200 ppm / K or less, preferably 100 ppm / K or less.

  Moreover, it is preferable that the Young's modulus at 23 degreeC of resin (A) is 5 GPa or less, More preferably, it is 4 GPa or less, More preferably, it is 3 GPa or less. The measuring method of Young's modulus is, for example, JIS Z2280 (Young's modulus of metal material), JIS K7161-1994 (Plastic tensile modulus), JIS K7113 (Plastic tensile test method), Static test method (Ewing method) And ultrasonic methods. If the Young's modulus exceeds 5 GPa, the heat shrinkage stress tends to be excessive. On the other hand, the lower limit is not particularly limited, but is usually larger than 0.5 GPa and preferably 1 GPa or more.

  When the surface protective layer is composed of a plurality of resins, it is sufficient that at least one kind of resin (A) satisfies a specific relationship with the reinforcing layer described later, and the reinforcing layer described later for all the resins (A). It is preferable to satisfy a specific relationship with Further, at least the resin used for the layer close to the reinforcing layer needs to satisfy the conditions of the linear expansion coefficient and the Young's modulus, and all the resins (A) used as the surface protective layer satisfy the conditions of the linear expansion coefficient and the Young's modulus. It is preferable. Regarding the relationship between the coefficient of linear expansion and the Young's modulus between the plurality of surface protective layers, it is preferable that the coefficient of linear expansion is smaller and the Young's modulus is larger as it is closer to the reinforcing layer.

  The method for obtaining these resins is not particularly limited, and commercially available products can be used. Examples of polycarbonate include polycarbonate plates manufactured by Takiron Co., Ltd., Iupilon manufactured by Mitsubishi Engineering Plastics Co., Ltd., and polymethyl methacrylate such as acrylite manufactured by Mitsubishi Rayon Co., Ltd. and Sumipex manufactured by Sumitomo Chemical Co., Ltd.

The thickness of the resin (A) is usually 0.2 mm or more. The thickness is preferably more than 0.4 mm, more preferably 1.0 mm or more, and even more preferably 1.5 mm or more. If it is less than 0.2 mm, the impact resistance is remarkably lowered. On the other hand, the upper limit is not particularly limited, but is preferably 5 mm or less. If the resin becomes too thick, the flexibility of the resin layer is reduced and the weight of the module is increased, so that the merit of using the solar cell module substrate as the resin is lost.
Moreover, the magnitude | size of the laminated surface of a surface protective layer should just have an area larger than the laminated surface of the photoelectric converting layer which has the photovoltaic cell mentioned later normally. The area of the lamination surface here means the area of the surface perpendicular to the thickness direction of the surface protective layer. A photoelectric conversion layer can fully be protected because the area of the lamination surface of a surface protective layer is larger than the area of the lamination surface of a photoelectric conversion layer.

  The resin (A) has a glass transition temperature (Tg) of preferably 160 ° C. or lower, and more preferably 150 ° C. or lower. Moreover, it is preferable that Tg of resin is 50 degreeC or more, and it is preferable that it is 70 degreeC or more. When Tg is in the above range, the solar cell module has an appropriate flexibility during lamination and excellent workability. The glass transition point Tg is measured by DSC measurement.

The resin (A) usually has a weight average molecular weight (Mw) of 10,000 or more. The upper limit is 70,000 or less, and preferably 20,000 or less. The weight average molecular weight in the present invention is determined by SEC (size exclusion chromatography) measurement. In SEC measurement, the elution time is shorter for higher molecular weight components and the elution time is longer for lower molecular weight components, but using the calibration curve calculated from the elution time of polystyrene (standard sample) with a known molecular weight, the elution time of the sample is changed to the molecular weight. The weight average molecular weight is calculated by conversion.
When using several resin for a surface protective layer, it is preferable that all the resin (A) to be used satisfy | fills the conditions of the said glass transition temperature (Tg) and weight average molecular weight (Mw).

Moreover, in the solar cell module of this invention, you may provide a surface protection sheet further in the outer side (sunlight side) of a surface protection layer. In the present invention, it is preferable to provide a surface protective sheet in order to suppress damage and deterioration of the surface protective layer and maintain the total light transmittance. The material constituting the surface protective sheet is preferably a weather-resistant film, and commonly used known materials can be used.
Examples of the resin used as the material for the weather resistant film include ethylene-tetrafluoroethylene copolymer, silicone, polyethylene, polypropylene, polyethylene terephthalate, and polyethylene naphthalate. Among these, an ethylene-tetrafluoroethylene copolymer is preferable.
The thickness of the weather-resistant protective film is not particularly limited, but is usually 10 μm or more, preferably 20 μm or more, and usually 200 μm or less, preferably 150 μm or less.

  Moreover, since a solar cell module is heated by sunlight, it is preferable that a surface protection sheet has heat resistance. Therefore, the constituent material of the surface protective sheet preferably has a melting point of 100 ° C. or higher, and more preferably 120 ° C. or higher. On the other hand, the upper limit of the melting point is preferably 320 ° C. or lower.

An adhesive layer may be provided between the surface protective sheet and the surface protective layer. The material of the adhesive layer is not particularly limited, but usually, for example, ethylene-vinyl acetate copolymer (EVA) resin, polyvinyl butyral (PVB) resin, modified polyethylene resin modified with maleic acid or silane, modified polypropylene resin, Light transmissive materials such as epoxy adhesives and urethane adhesives are used. The thickness of the adhesive layer is not particularly limited, but a sheet shape of, for example, 300 to 500 μm is preferable.

<Photoelectric conversion layer>
The photoelectric conversion layer is a layer having solar cells that can directly convert light energy into electric power, and is usually formed by connecting a plurality of solar cells with a collector line or the like. Electricity generated in the solar battery cell can be taken out via an external converter through a collector line.
As a solar cell element, a silicon solar cell element such as a single crystal silicon solar cell element, a polycrystalline silicon solar cell element, an amorphous silicon solar cell element, a microcrystalline silicon solar cell element, a spherical silicon solar cell element, or the like is used. Can do. Moreover, compound solar cell elements, such as a CIS type solar cell element, a CIGS type solar cell element, and a GaAs type solar cell element, can also be adopted. Further, a dye-sensitized solar cell element, an organic thin film solar cell element, a multi-junction solar cell element, a HIT solar cell element, or the like may be employed.
For example, the silicon solar cell element may be a commercially available one, and examples thereof include solar cells manufactured by Q-Cells, First Solar, Suntech, Sharp, and the like.

Each electrode of the element of the solar battery cell can be formed using one or more arbitrary materials having conductivity. Examples of the electrode material (electrode constituent material) include metals such as platinum, gold, silver, aluminum, chromium, nickel, copper, titanium, magnesium, calcium, barium, sodium, and alloys thereof; indium oxide and tin oxide Metal oxides such as, or alloys thereof (ITO: indium tin oxide); conductive polymers such as polyaniline, polypyrrole, polythiophene, polyacetylene; acids such as hydrochloric acid, sulfuric acid, sulfonic acid, A material containing a dopant such as a Lewis acid such as FeCl ₃ , a halogen atom such as iodine, or a metal atom such as sodium or potassium; conductive particles such as metal particles, carbon black, fullerene, or carbon nanotubes, and a matrix such as a polymer binder And conductive composite materials dispersed in the material.

The thickness of each electrode and the thickness of the photoelectric conversion layer can be determined based on the required output and the like.
Further, an auxiliary electrode may be provided so as to be in contact with the electrode. In particular, it is effective when using a slightly conductive electrode such as ITO. As the auxiliary electrode material, the same material as the above metal material can be used as long as the conductivity is good, but silver, aluminum, and copper are exemplified.

  The linear expansion coefficient at −30 to 30 ° C. of the photoelectric conversion layer is preferably 40 ppm / K or less, more preferably 35 ppm / K or less, and particularly preferably 30 ppm / K or less. The linear expansion coefficient is measured by, for example, ASTM D696. When the linear expansion coefficient exceeds 40 ppm / K, deformation due to temperature change is large, so that it tends to break down under heating / cooling processes or actual use conditions. On the other hand, the lower limit is not particularly limited, but is usually 1 ppm / K or more and preferably 3 ppm / K or more.

<Back side protective layer>
As the back surface protective layer of the solar cell module of the present invention, a resin (hereinafter sometimes referred to as “resin (B)”) is used.
Examples of such a resin include polycarbonate (PC) resin, polymethyl methacrylate (PMMA), glass epoxy multilayer material, fiber reinforced plastic (FRP), cyclic polyolefin, polystyrene, polyethylene terephthalate (PET), and the like. Preferably, polycarbonate (PC) resin, polymethyl methacrylate (PMMA)
), Glass epoxy multilayer materials, and the like. The back surface protective layer may have a multilayer structure using a plurality of these resins. In that case, it is preferable to fuse the layers by a heat-sealing method or to provide a sealing material layer.

  As resin (B) used for a back surface protective layer, the same kind as resin (A) may be different, but it is preferable to use the same resin. As a combination of the resin (A) and the resin (B), when the resin (A) is a PC resin and the resin (B) is a PC resin, the resin (A) is a PMMA resin and the resin (B) is PMMA. In the case of a resin, it is preferable that the resin (A) is a PC resin and the resin (B) is a PMMA resin, and the resin (A) is a PMMA resin and the resin (B) is a PC resin. A particularly preferable combination is a case where the resin (A) is a PC resin and the resin (B) is a PC resin, and the effect of the configuration of the present invention becomes remarkable.

The thickness of the resin (B) is preferably 0.2 mm or more. The thickness is preferably more than 0.4 mm, more preferably 1.0 mm or more, and even more preferably 1.5 mm or more. If it is less than 0.2 mm, the impact resistance is remarkably lowered.
The thickness of the resin (B) is most preferably the same as that of the resin (A), but may be in the range of 1/3 to 3 times.

Further, the resin (B) has a linear expansion coefficient at −30 to 30 ° C. of preferably 50 ppm / K or more, more preferably 55 ppm / K or more, and further preferably 60 ppm / K as in the resin (A). K or more. On the other hand, the upper limit is not particularly limited, but is usually 200 ppm / K or less, preferably 100 ppm / K or less. Further, the Young's modulus at 23 ° C. is preferably 5 GPa or less, more preferably 4 GPa or less, and further preferably 3 GPa or less. On the other hand, the lower limit is not particularly limited, but is usually larger than 0 GPa and preferably 1 GPa or more.
Moreover, resin (B) is the same as that of resin (A) also about the preferable range of a glass transition temperature (Tg) and a weight average molecular weight. The conditions for the linear expansion coefficient, Young's modulus, glass transition temperature (Tg), and weight average molecular weight of the resin (B) when a plurality of resins are used for the back surface protective layer are the same as those for the surface protective layer.

<Encapsulant layer>
The photoelectric conversion layer in the solar cell module is usually provided with a sealing material layer so as to cover the photoelectric conversion layer for the purpose of sealing the photoelectric conversion layer and the like. Since a sealing material layer is arrange | positioned so that a photoelectric converting layer may be covered, it is arrange | positioned between a surface protective layer and a photoelectric converting layer, and between a back surface protective layer and a photoelectric converting layer. Moreover, you may arrange | position a sealing material layer also between the below-mentioned reinforcement layer and back surface protective layer, and between a photoelectric converting layer and the below-mentioned reinforcement layer.

  The material of these sealing material layers is not particularly limited as long as it is a synthetic resin material that transmits sunlight, and a known and commonly used material can be used. For example, crosslinkable or non-crosslinkable ethylene-vinyl acetate copolymer (EVA) resin, polyvinyl butyral (PVB) resin, modified polyethylene resin modified with maleic acid or silane, modified polypropylene resin, epoxy adhesive, A urethane-based adhesive or the like can be used.

  The thickness of the sealing material layer is preferably 100 μm or more, more preferably 200 μm or more, and further preferably 300 μm or more. On the other hand, it is preferably 1000 μm or less, more preferably 800 μm or less, and even more preferably 600 μm or less. By setting the thickness of the sealing material layer within the above range, moderate impact resistance can be obtained, which is preferable from the viewpoint of cost and weight, and power generation characteristics can be sufficiently exhibited.

<Reinforcing layer>
The reinforcing layer is a layer disposed between the surface protective layer and the back surface protective layer, and the photovoltaic cell of the photoelectric conversion layer is formed by heat shrinkage stress from the surface protective layer and the back surface protective layer generated during cooling after heat lamination. This is a layer that prevents damage to the solar battery cell and cracks in the solar battery cell. In the solar cell module of the present invention, the linear expansion coefficient of the reinforcing layer is smaller than the linear expansion coefficients of the surface protective layer and the back surface protective layer, and the Young's modulus of the reinforcing layer is the Young's modulus of the surface protective layer and the back surface protective layer. It is necessary to be above the rate. The solar cell module of the present invention has a reinforcing layer that satisfies such characteristics, and thus has become a load on the photoelectric conversion layer, and heat shrinkage from the surface protective layer and the back surface protective layer that occurs during cooling after thermal lamination. It has become possible to prevent damage and cracking of solar cells due to stress.
The number of reinforcing layers included in the solar cell module of the present invention is not particularly limited, but is usually 1 to 2 layers. The reinforcing layer may be between the back surface protective layer and the photoelectric conversion layer, or between the surface protective layer and the photoelectric conversion layer, but at least one reinforcing layer is composed of the back surface protective layer and the photoelectric conversion layer. In addition, it is preferably between the photoelectric conversion layer and the surface protective layer.

  Moreover, it is preferable that a linear expansion coefficient in -30-30 degreeC is 40 ppm / K or less, More preferably, it is 35 ppm / K or less, More preferably, it is 30 ppm / K or less. As this value decreases, the solar cell damage due to heat shrinkage stress from the surface protective layer tends to decrease. When the linear expansion coefficient exceeds 40 ppm / K, the thermal deformation of the reinforcing layer itself tends to increase and the reinforcing effect tends to decrease. On the other hand, the lower limit is not particularly limited, but is preferably 1 ppm / K or more. If the value is too small, it may be smaller than the linear expansion coefficient on the side on which the solar cell module is fixed (inorganic roofing material, metal frame, etc.), which may have an adverse effect.

  Further, the reinforcing layer preferably has a Young's modulus at 23 ° C. of 6 GPa or more. More preferably, it is 10 GPa or more, More preferably, it is 20 GPa or more. As this value increases, the reinforcing effect tends to increase. If the linear expansion coefficient is less than 6 GPa, the reinforcing effect tends to decrease. On the other hand, the upper limit is not particularly limited, but is preferably 300 GPa or less.

  In the reinforcing layer of the present invention, the area of the laminated surface (area of the surface perpendicular to the thickness direction) is preferably the same as or larger than the area of the laminated surface of the photoelectric conversion layer. By setting it as such an aspect, buckling of the current collection line which exists in the peripheral part of a photoelectric converting layer can be suppressed. Moreover, it is preferable that it is the same as the area of the laminated surface of a surface protective layer and a back surface protective layer, or smaller than them. The reason is that the resins are laminated on the peripheral edge of the solar cell module, and the occurrence of peeling from the end of the reinforcing layer can be suppressed.

  The material of the reinforcing layer is not particularly limited as long as the material satisfies the above conditions, but preferably a metal (aluminum, iron, stainless steel, copper, brass, galvalume steel plate, etc.) or a metal oxide of these metals, Inorganic oxides (silicon oxide, alumina, zinc oxide, zirconia, forsterite, steatite, cordierite, sialon, zircon, ferrite, mullite, etc.), glass (thin float glass (soda lime glass, non-alkali glass, etc.)) , High-strength plastics (stretched polyester resin sheets such as stretched polyethylene terephthalate (stretched PET) and stretched polyethylene naphthalate (stretched PEN), polyimide, polyphenylene sulfide, phenol resins, or their glass or carbon fiber reinforced materials). It is done. Moreover, when arrange | positioning a reinforcement layer in the light-receiving surface side rather than a photoelectric converting layer, it is necessary to use a material with high light transmittance. Examples of such a material include glass such as thin plate glass, stretched PET, stretched PEN, and the like.

The thickness of the reinforcing layer is not particularly limited, but is usually 50 μm or more, preferably 100 μm or more, and more preferably 150 μm or more. On the other hand, the upper limit is usually 1000 μm or less, preferably 500 μm or less.
In addition, it is preferable in terms of appearance that a sealing material layer is provided on the upper layer and the lower layer of the reinforcing layer so that the reinforcing layer is included in the sealing material layer.

<Electrical insulation layer>
The solar cell module of the present invention can further be provided with an electrical insulating layer. The electrical insulating layer is not particularly limited as long as it is a material that is difficult to conduct electricity. By providing such an electrical insulating layer, it is possible to prevent electricity generated in the photoelectric conversion layer from escaping from the outside of the collector line, so that the power generation efficiency of the solar cell is improved.
As the electrical insulating layer, for example, a fluorine resin such as ETFE (a copolymer of tetrafluoroethylene and ethylene), PET, or the like can be used. Note that the arrangement position of the electrical insulating layer is not particularly limited, but in the case where the electric insulating layer is arranged on the light receiving surface side with respect to the photoelectric conversion layer, it is necessary to use a material having high light transmittance.

  The thickness of the electrical insulating layer is not particularly limited, but is usually 10 μm or more, preferably 25 μm or more, more preferably 50 μm or more. On the other hand, the upper limit is usually 500 μm or less, preferably 300 μm or less.

In addition to these layers, a gas barrier layer, an ultraviolet cut layer, a weather resistant protective layer, a scratch resistant layer, an antifouling layer, and other known constituent members may be laminated.
The shape of the solar cell module as a whole having the above layer configuration is not particularly limited, but is usually flat or distorted in the biaxial direction with a minimum radius of curvature R of 10,000 mm or less. In the case of having a minimum radius of curvature R and being distorted in the biaxial direction, R is preferably 5000 mm or less, more preferably R is 3,000 mm or less, and particularly preferably R is 2000 mm or less. Although it does not specifically limit as a method of making it curve, For example, the method of making it curve by heating is mentioned.

<Method for manufacturing solar cell module>
Although the manufacturing method of the solar cell module of this invention can use a well-known method, for example, the multilayer sheet containing a surface protective layer, a sealing material layer, a photoelectric converting layer, a sealing material layer, a reinforcement layer, a back surface protective layer etc. The solar cell module can be obtained by placing in a vacuum lamination device, heating after vacuuming, and cooling after elapse of a certain time.

The heat laminating conditions are not particularly limited, and heat laminating is possible under normal conditions.
It is preferably performed under vacuum conditions, and the degree of vacuum is usually 30 Pa or more, preferably 50 Pa or more, more preferably 80 Pa or more. On the other hand, the upper limit is usually 150 Pa or less, preferably 120 Pa or less, more preferably 100 Pa or less. By setting it as the said range, since generation | occurrence | production of a bubble can be suppressed in each layer in a module, and productivity improves, it is preferable.
The vacuum time is usually 1 minute or longer, preferably 2 minutes or longer, more preferably 3 minutes or longer. On the other hand, the upper limit is usually 8 minutes or less, preferably 6 minutes or less, more preferably 5 minutes or less. Setting the vacuum time in the above range is preferable because the appearance of the solar cell module after heat lamination becomes good and the generation of bubbles in each layer in the module can be suppressed.

The pressurizing condition of the thermal laminate is usually a pressure of 50 kPa or more, preferably 70 kPa or more, more preferably 90 kPa or more. On the other hand, the upper limit value is preferably 101 kPa or less. By setting it as the pressurization conditions of the said range, since moderate adhesiveness can be acquired, without damaging a solar cell module, it is preferable also from a durable viewpoint.
The holding time of the pressure is usually 1 minute or longer, preferably 3 minutes or longer, more preferably 5 minutes or longer. On the other hand, the upper limit is usually 30 minutes or less, preferably 20 minutes or less, more preferably 15 minutes or less. Since the gelation rate of the sealing layer can be made appropriate by setting the holding time, the function of protecting the power generation element of the sealing layer can be sufficiently exhibited, and sufficient adhesive strength can be obtained. be able to.

The temperature condition of the thermal laminate is usually 120 ° C. or higher, preferably 130 ° C. or higher, more preferably 140 ° C. or higher. On the other hand, the upper limit is usually 180 ° C. or lower, preferably 160 ° C. or lower, more preferably 150 ° C. or lower. By setting the temperature range, sufficient adhesive strength can be obtained.
Moreover, the heating time of the said temperature is 10 minutes or more normally, Preferably it is 12 minutes or more, More preferably, it is 15 minutes or more. On the other hand, the upper limit is 60 minutes or less, preferably 45 minutes or less, more preferably 30 minutes or less. By setting it as the said heating time, since durability of a sealing material is bridge | crosslinked moderately and it can have moderate softness | flexibility, it is preferable.

  The solar cell module of the present invention thus obtained has impact resistance that suppresses the destruction of solar cells despite being thin and lightweight, and also has a function that suppresses deflection and vibration. Therefore, it can be attached to a vehicle such as a truck.

  Hereinafter, although the solar cell module of this invention is demonstrated with reference to drawings, this invention is not necessarily limited only to such an embodiment.

  FIG. 1 is a schematic view according to one embodiment of the solar cell module of the present invention. The solar cell module of the present invention is sealed from the surface layer protective layer 1 side between the surface protective layer 1 such as polycarbonate resin or polymethyl methacrylate resin and the back surface protective layer 2 such as polycarbonate resin or polymethyl methacrylate resin. The material layer 4, the photoelectric conversion layer 3, the sealing material layer 4, the reinforcing layer 5, and the sealing material layer 4 are laminated.

  Thus, by providing the reinforcing layer 5 between the surface protective layer 1 and the back surface protective layer 2, heat is applied to the photoelectric conversion layer 3 from the surface protective layer 1 and the back surface protective layer 2 during cooling after heat lamination. Shrinkage stress is generated. However, the solar cell module of the present invention is provided with the reinforcing layer 5, thereby being resistant to heat shrinkage stress from the surface protective layer 1 and / or the back surface protective layer 2 and preventing damage to the photoelectric conversion layer 3. be able to. As the properties of the reinforcing layer 5, the linear expansion coefficient is smaller than the linear expansion coefficients of the surface protective layer 1 and the back surface protective layer 2, and the Young's modulus is equal to or higher than the Young's modulus of the surface protective layer 1 and the back surface protective layer 2. is there.

  Moreover, FIG. 2 is the schematic which concerns on another embodiment of the solar cell module of this invention. In FIG. 2, the reinforcing layer 5 is laminated so as to be included in the sealing material layer 4. In addition, the electrical insulating layer 6 is disposed between the photoelectric conversion layer 3 and the reinforcing layer 5 via the sealing material layer 4. By providing the electrical insulating layer 6, it is possible to prevent electricity generated in the photoelectric conversion layer 3 from coming out of the solar cell module from other than the collector line, and thus the power generation efficiency of the solar cell module is improved.

  On the other hand, FIG. 3 shows an embodiment of a conventional solar cell module without a reinforcing layer. In the solar cell module of such an aspect, since there is no layer for preventing the heat shrinkage stress from the surface protective layer 1 and the back surface protective layer 2 to the photoelectric conversion layer 3 that occurs during cooling after thermal lamination, Problems such as cracks occurring in the solar cells and buckling of the current collectors occur.

  FIG. 4 shows an embodiment of a solar cell module that does not include the back surface protective layer but includes the reinforcing layer 5 and the electrical insulating layer 6. In such an aspect in which the resin substrate layer is provided only on one side of the solar cell module, a large “warp” is generated in the solar cell module at the time of thermal lamination, so that the appearance may be greatly impaired.

FIG. 5 is a schematic view according to another embodiment of the solar cell module of the present invention. In FIG. 5, the reinforcing layer 5 is disposed so as to sandwich the photoelectric conversion layer 3. With such a configuration, the stress on the photoelectric conversion layer can be greatly reduced. Moreover, weather resistance can be improved by arrange | positioning the surface protection sheet 11 on the surface protection layer 1 further. By using a surface protective sheet having a function different from that of the surface protective layer, for example, both ultraviolet resistance and moisture resistance can be achieved.
FIG. 6 is a schematic view according to another embodiment of the solar cell module of the present invention. In FIG. 6, two types of resins are used for the front surface protective layers 1 and 11 and the back surface protective layer 2. By using two kinds of resins in combination, the strength can be improved and thermal deformation can be reduced.

FIG. 7 is a schematic view according to another embodiment of the solar cell module of the present invention. In FIG. 7, the reinforcing layer 5 is disposed so as to sandwich the photoelectric conversion layer 3, and the reinforcing layer 5 is laminated so as to be included in the sealing material layer 4.
FIG. 8 is a schematic view according to another embodiment of the solar cell module of the present invention. In FIG. 8, the reinforcing layer 5 is disposed between the back surface protective layer 2 and the photoelectric conversion layer 3 so as to be included in the sealing material layer 4.
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, it cannot be overemphasized that this invention is not limited only to a following example.

<Example 1>
A solar cell module 1 having the layer configuration shown in FIG. 1 was produced.
Specifically, a polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 2 mm (made by Takiron Co., Ltd., PC1600), a length of 400 mm, a width of 200 cm, and a thickness of 0.5 mm of a sealing material (Ci Kasei Co., Ltd., ethylene- Vinyl acetate copolymer (EVA) sheet UFHCE), 400 mm long, 200 cm wide, 0.4 mm thick aluminum plate (manufactured by Mitsubishi Aluminum Co., Ltd., double-sided Super-Ecoat treated product), 400 mm long, 200 cm wide, thickness 0. A 5 mm sealing material (Chi Kasei Co., Ltd., EVA sheet UFHCE) is sequentially laminated, and on top of that, two polycrystalline silicon cells (Q-cells, Q6LTT3-200 / 1660-AD) are 4 mm. It was arranged with a gap between them. Both polycrystalline silicon cells were connected by three bus bars, and both ends of the bus bar were extended so as to protrude from the laminated resin plates. Thereafter, a sealing material having a length of 400 mm, a width of 200 cm, and a thickness of 0.5 mm (VA sheet UFHCE, manufactured by CI Kasei Co., Ltd.), a polycarbonate plate having a length of 400 mm, a width of 200 cm, and a thickness of 2 mm (made by Takiron Corporation, PC1600) Were stacked and placed in a solar cell module laminator (manufactured by NPC, LM-50 × 50-S). First, the inside of the laminator was held under reduced pressure for 5 minutes, and then the laminate was held at 135 ° C. for 30 minutes while being brought into a pressure-bonded state at atmospheric pressure, whereby the solar cell module 1 was obtained. Thereafter, it was cooled from 135 ° C. to 30 ° C. over 30 minutes. When the appearance of the solar cell module 1 was inspected after cooling, the cell module was not damaged, the bus bar was not buckled, and the entire module was not warped.

<Example 2>
A solar cell module 2 having the layer configuration shown in FIG. 2 was produced.
Specifically, 400 mm long, 200 mm wide, 1.5 mm thick polycarbonate plate (Takiron Co., Ltd., PC1600), 400 mm long, 200 cm wide, 0.5 mm thick sealing material (Ci Kasei Co., Ltd., Stacked EVA sheet UFHCE), 360 mm long, 160 mm wide, 0.4 mm thick aluminum plate (manufactured by Mitsubishi Aluminum Co., Ltd., double-sided Super-Ecoat treated product) and 0.5 mm thick sealing material (Cai Kasei) Co., Ltd., EVA sheet UFHCE) was sequentially laminated. On top of that, a 400 mm long, 200 cm wide, 0.3 mm thick sealing material (Chi Kasei Co., Ltd., EVA sheet UFHCE), 400 mm long, 200 mm wide.
mm, 0.05 mm thick ETFE film, 400 mm long, 200 mm wide, 0.3 mm thick encapsulant (CHI Kasei Co., Ltd., EVA sheet UFHCE) are sequentially laminated, and then a polycrystalline silicon cell (Q-cells, Q6LTT3-200 / 1660-AD) Two pieces are connected with three bus bars with a gap of 4 mm, and both ends of the bus bar are placed so as to protrude from the laminated resin plates. (FIG. 1), 400 mm long, 200 mm wide, 0.5 mm thick sealing material (Chi Kasei Co., Ltd., EVA sheet UFHCE), 400 mm long, 200 cm wide, 1.5 mm thick polycarbonate plate (Takiron) The laminated body which put the product made from Corporation | KK, PC1600) was thrown into the solar cell module laminator (LM-50 * 50-S). First, the inside of the laminator was held under reduced pressure for 5 minutes, and then the laminate was held at 135 ° C. for 30 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain a solar cell module 2. Thereafter, it was cooled from 135 ° C. to 30 ° C. over 30 minutes. When the appearance of the solar cell module 2 was examined after cooling, the cell module was not damaged, the bus bar was not buckled, and the entire module was not warped. According to JIS C8991, the maximum power generation efficiency at the time of irradiation of pseudo sunlight 1000 W / m ² was 7.0 W.

<Comparative Example 1>
400 mm long, 200 cm wide, 2 mm thick polycarbonate plate (Takiron Co., Ltd., PC1600), 400 mm long, 200 mm wide, 0.5 mm thick sealing material (Ci Kasei Co., Ltd., ethylene-vinyl acetate copolymer) (EVA) sheets UFHCE) are sequentially laminated, and two polycrystalline silicon cells (manufactured by Q-cells, Q6LTT3-200 / 1660-AD) are connected by three bus bars with a gap of 4 mm. The both ends of the busper were placed so as to protrude from the laminated resin plate, and further, a sealing material having a length of 400 mm, a width of 200 mm, and a thickness of 0.5 mm (made by Sea Chemical Co., Ltd., EVA sheet UHFCE), A laminate on which a polycarbonate plate (PC1600, manufactured by Takiron Co., Ltd.) having a length of 400 mm, a width of 200 mm, and a thickness of 2 mm is placed Module laminator (NPC Inc., LM-50 × 50-S) were placed in. First, the inside of the laminator was held for 5 minutes under reduced pressure, and then the laminate was held at 135 ° C. for 30 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain a solar cell module 3. Thereafter, it was cooled from 135 ° C. to 30 ° C. over 30 minutes. When the appearance of the solar cell 3 was inspected after cooling, many cracks were confirmed in the cell, and the bus bar was buckled in the vicinity of the cell. There was no warping of the entire module.

<Comparative example 2>
400 mm long, 200 mm wide, 0.4 mm thick aluminum plate (Mitsubishi Aluminum Co., Ltd., double-sided Super-Ecoat treated product), 400 mm long, 200 mm wide, 0.5 mm thick sealing material (Ci Kasei Co., Ltd.) , EVA sheet UFHCE), 400 mm long, 200 mm wide, 0.05 mm thick ETFE film, 400 mm long, 200 mm wide, 0.5 mm thick sealing material (Chiai Kasei Co., Ltd., EVA sheet UFCCE) were sequentially laminated. In addition, two polycrystalline silicon cells (Q-cells, Q6LTT3-200 / 1660-AD) are connected by three bus bars with a gap of 4 mm, and both ends of the bus bar are laminated resin plates. After placing the material that extends so as to protrude from the surface, it is further sealed with 400 mm in length, 200 mm in width, and 0.5 mm in thickness. A laminated body on which an EVA sheet UFHCE (manufactured by Co., Ltd.), a polycarbonate plate having a length of 400 mm, 200 cm, and a thickness of 1.5 mm (Takiron Co., Ltd., PC1600) is placed is a solar cell module laminator (manufactured by NPC, LM-50). × 50-S). First, the inside of the laminator was held for 5 minutes under reduced pressure, and then the laminate was held at 135 ° C. for 30 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain a solar cell module 4. Thereafter, it was cooled from 135 ° C. to 30 ° C. over 30 minutes. When the solar cell module 4 was inspected after cooling, the cell was not damaged or the bus bar was not buckled, but the entire module warped greatly. According to JIS C8991, the maximum power generation efficiency at the time of irradiation of pseudo sunlight 1000 W / m ² was 7.0 W.

<Example 3>
A solar cell module 5 having the layer configuration shown in FIG. 5 was manufactured.
Specifically, a polycarbonate plate having a thickness of 0.4 mm (PC1600, manufactured by Takiron Co., Ltd.) and a sealing material having a thickness of 0.3 mm (produced by C-I Kasei Co., Ltd., EVA, each cut to a length of 750 mm and a width of 680 mm. Sheet UFHCE), 0.1 mm thick PET film (Mitsubishi Resin Co., Ltd., T680E), and 0.3 mm thick sealing material (CI Kasei Co., Ltd. EVA sheet UFHCE) After putting 12 crystal silicon cells (Q-cells, Q6LTT3-200 / 1660-AD) connected by 3 bus bars with a gap of 4 mm, they were cut into 750 mm length and 680 mm width respectively. , 0.3 mm thick sealing material (Chi Kasei Co., Ltd., EVA sheet UFHCE), 0.1 mm thick PET film (Mitsubishi Resin Co., Ltd.) T680E), 0.3 mm thick sealing material (Chi Kasei Co., Ltd., EVA sheet UFHCE), 0.4 mm thick polycarbonate plate (Takiron Co., Ltd., PC1600), 0.3 mm thick sealing material ( A laminate on which an ETFE film having a thickness of 0.1 mm was manufactured by CII Kasei Co., Ltd., EVA sheet UFHCE, was put into a vacuum laminator (NLM-270 × 400, manufactured by NPC). First, the interior of the laminator was held under reduced pressure for 5 minutes, and then the laminate was held at 130 ° C. for 60 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain a solar cell module 5. When the appearance of the solar cell module 5 was inspected after cooling, the cell module was not damaged, the bus bar was not buckled, and the entire module was not warped. According to JIS C8991, the maximum power generation efficiency at the time of irradiation with pseudo-sunlight 1000 W / m ^{2 was} 43 W.

<Example 4>
A solar cell module 6 having the layer configuration shown in FIG. 6 was manufactured.
Specifically, a PET film having a thickness of 0.1 mm (made by Mitsubishi Plastics Co., Ltd., T680E), cut into a length of 400 mm and a width of 200 mm, respectively, and a sealing material having a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd.) , Z86), 2 mm thick polycarbonate plate (PC1600, manufactured by Takiron Co., Ltd.), 0.4 mm thick sealing material (Dai Nippon Printing Co., Ltd., Z86), 0.1 mm thick PET film (Mitsubishi Resin ( Co., Ltd., T680E) was put into a vacuum laminator (NPC, NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 5 minutes, and then the laminate was held at 130 ° C. for 40 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain member 1. On the member 1, a sealing material having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (manufactured by CI Kasei Co., Ltd., EVA sheet UFHCE), a polycrystalline silicon cell (manufactured by Q-cells, Q6LTT3-200 / 1660-A -D) After putting two pieces connected by three bus bars with a gap of 4 mm, a sealing material having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (made by Sea Chemical Co., Ltd., EVA sheet UHFCE) ), The laminate on which the member 1 was placed was put into a vacuum laminator (NLM-270 × 400, manufactured by NPC). First, the inside of the laminator was held under reduced pressure for 5 minutes, and then the laminate was held at 130 ° C. for 40 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain a solar cell module 6. When the appearance of the solar cell module 6 was examined after cooling, the cell module was not damaged, the bus bar was not buckled, and the entire module was not warped. According to JIS C8991, the maximum power generation efficiency at the time of irradiation of pseudo sunlight 1000 W / m ² was 6.9 W.

<Example 5>
A solar cell module 7 having the layer configuration shown in FIG. 7 was produced.
Specifically, a 400 mm long, 200 mm wide, 1 mm thick polycarbonate plate (Takiron Co., Ltd., PC1600), a 400 mm long, 200 mm wide, 0.4 mm thick sealing material (Ci Kasei Co., Ltd., EVA sheet) UFHCE), 380 mm long, 180 mm wide, 0.2 mm thick glass plate (manufactured by Nippon Electric Glass Co., Ltd., OA-10GF), 400 mm long, 200 mm wide, 0.4 mm thick sealing material (CHI Kasei Co., Ltd.) Made by sequentially stacking EVA sheets UFHCE) and connecting two polycrystalline silicon cells (Q-cells, Q6LTT3-200 / 1660-AD) with 3 bus bars with a gap of 4 mm After placing, a sealing material having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (Eva sheet UFHCE, manufactured by Sea Chemical Co., Ltd.), length 380 m, 180 mm wide, 0.2 mm thick glass plate (manufactured by Nippon Electric Glass Co., Ltd., OA-10GF), 400 mm long, 200 mm wide, 0.4 mm thick sealing material (CAI Kasei Co., Ltd., EVA sheet) A laminate on which a polycarbonate plate (UFHCE), 400 mm in length, 200 mm in width, and 2 mm in thickness (PC1600, manufactured by Takiron Co., Ltd.) was placed was put into a vacuum laminator (NLM-270 × 400, manufactured by NPC). First, the inside of the laminator was held under reduced pressure for 5 minutes, and then the laminated body was held in a pressure-bonded state at atmospheric pressure for 60 minutes to obtain a solar cell module 7. When the appearance of the solar cell module 7 was inspected after cooling, the cell module was not damaged, the bus bar was not buckled, and the entire module was not warped. According to JIS C8991, the maximum power generation efficiency at the time of irradiation of pseudo-sunlight 1000 W / m ² was 6.8 W.

<Example 6>
A solar cell module 8 having the layer configuration shown in FIG. 8 was manufactured.
Specifically, a 400 mm long, 200 mm wide, 2 mm thick polycarbonate plate (Takiron Co., Ltd., PC1600), a 400 mm long, 200 mm wide, 0.5 mm thick sealing material (Ci Kasei Co., Ltd., EVA sheet) UFHCE), 380 mm long, 180 mm wide, 0.3 mm thick glass plate (manufactured by Nippon Electric Glass Co., Ltd., OA-10GF), 400 mm long, 200 mm wide, 0.3 mm thick encapsulant (CI Chemical Co., Ltd.) Made by sequentially stacking EVA sheets UFHCE) and connecting two polycrystalline silicon cells (Q-cells, Q6LTT3-200 / 1660-AD) with 3 bus bars with a gap of 4 mm After placing, a sealing material having a length of 400 mm, a width of 200 mm, and a thickness of 0.5 mm (VA sheet UFHCE, manufactured by Sea Chemical Co., Ltd.), length of 400 m, horizontal 200 mm, a polycarbonate plate having a thickness of 2 mm (TAKIRON Co., PC 1600) laminates topped with a vacuum laminator (NPC Co., NLM-270 × 400) were placed in a. First, the inside of the laminator was held under reduced pressure for 5 minutes, and then the laminated body was held at 130 ° C. for 60 minutes while being brought into a pressure-bonded state at atmospheric pressure to obtain a solar cell module 8. When the appearance of the solar cell module 8 was inspected after cooling, the cell module was not damaged, the bus bar was not buckled, and the entire module was not warped. According to JIS C8991, the maximum power generation efficiency at the time of irradiation of pseudo sunlight 1000 W / m ² was 7.0 W.

  Table 1 shows the physical properties of each layer used in Examples and Comparative Examples. The linear expansion coefficient and Young's modulus are values measured at 23 ° C.

DESCRIPTION OF SYMBOLS 1 Surface protective layer 11 Surface protective sheet 2 Back surface protective layer 3 Photoelectric conversion layer 31 Current collector 4 Sealing material layer 5 Reinforcement layer 6 Electrical insulation layer

Claims (13)

  A solar cell module having a photoelectric conversion layer and a reinforcing layer between a surface protective layer and a back surface protective layer, wherein the reinforcing layer has a linear expansion coefficient smaller than that of the surface protective layer and the back surface protective layer. A solar cell module, wherein the Young's modulus is equal to or greater than the Young's modulus of the surface protective layer and the back surface protective layer.   2. The solar cell module according to claim 1, wherein the reinforcing layer has a linear expansion coefficient at −30 to 30 ° C. of 40 ppm / K or less and a Young's modulus at 23 ° C. of 6 GPa or more.   The linear expansion coefficient at −30 to 30 ° C. of the surface protective layer and the back surface protective layer is 50 ppm / K or more, and the Young's modulus at 23 ° C. of the surface protective layer and the back surface protective layer is 5 GPa or less. The solar cell module according to claim 1 or 2, characterized by the above.   The area of the laminated surface of the said reinforcement layer is the same as the area of the laminated surface of the said surface protective layer and the said back surface protective layer, or smaller than them, The any one of Claims 1-3 characterized by the above-mentioned. Solar cell module.   5. The solar cell module according to claim 1, wherein an area of the laminated surface of the reinforcing layer is the same as or larger than an area of the laminated surface of the photoelectric conversion layer.   6. The solar cell according to claim 1, wherein the material of the reinforcing layer is at least one selected from the group consisting of a metal, a metal oxide, glass, and a stretched polyester resin sheet. module.   The linear expansion coefficient in -30-30 degreeC of the said photoelectric converting layer is 40 ppm / K or less, The solar cell module of any one of Claims 1-6 characterized by the above-mentioned.   The solar cell module according to claim 1, further comprising an electrical insulating layer between the photoelectric conversion layer and the reinforcing layer.   The solar cell module of any one of Claims 1-8 laminated | stacked in order of a surface protective layer, a photoelectric converting layer, an electrical insulating layer, a reinforcement layer, and a back surface protective layer from the sunlight light-receiving surface side.   The solar cell module according to any one of claims 1 to 8, wherein the reinforcing layer is at least between the back surface protective layer and the photoelectric conversion layer.   The solar cell module according to claim 10, wherein the reinforcing layer further exists between the photoelectric conversion layer and the surface protective layer.   The solar cell module according to any one of claims 1 to 11, wherein the minimum curvature radius R is 10,000 mm or less, and the curvature is biaxial.   The member for vehicles which has the solar cell module of any one of Claims 1-12.

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