JP2015057811A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module the power generation characteristics of which are not impaired by suppressing the buckling and damage of a solar cell or wires in the solar cell module, and peeling of the solar cell in the module, during manufacture of a solar cell module or during use thereof under an environment of significant temperature change.SOLUTION: In a solar cell module where a photoelectric conversion layer, connecting one or more solar cells by wires, is stacked between a surface protection layer and a rear surface protection layer, composed of a resin satisfying the condition that the tensile elasticity is 1 GPa or more, the linear expansion coefficient is 30 ppm/K or more, and the total light transmittance is 80% or more, a thermoplastic resin and a thermosetting resin are stacked between the surface protection layer and the photoelectric conversion layer, and between the photoelectric conversion layer and the rear surface protection layer.

Description

  The present invention relates to a solar cell module.

In recent years, people's awareness of ecology has increased, and expectations for solar cells, which are clean energy, are increasing due to their safety and ease of handling. As a specific example of such a solar cell module, a see-through solar cell module having a light transmission part is known (Patent Document 1).
The see-through solar cell module described in Patent Document 1 includes a surface covering material, a solar cell element, a back surface covering material, a filler for embedding the solar cell element, and the like. Patent Document 1 describes an example in which polycarbonate is used as the surface coating material or the back coating material, and EVA (ethylene-vinyl acetate copolymer) is used as the filler.

  In Patent Document 2, in a solar cell module using polycarbonate as a base material, a solar cell module in which a thermoplastic resin layer is provided between a power generation member such as a photoelectric conversion layer and a polycarbonate base material, the solar cell module is manufactured. It is described that bubbles can be prevented from accumulating in the solar cell module during durability under high temperature and high humidity conditions.

JP-A-9-92848 JP 2012-99613 A

  When manufacturing a solar cell module using a polycarbonate substrate, it is usually manufactured by heating and compressing a laminate of a substrate, a sealing agent layer, or a photoelectric conversion layer with a vacuum laminator or the like. Manufacturing with the laminator In some cases, cracks occur in the solar battery cell, or the solar battery module has a shape in which two polycarbonate resins are used and the photoelectric conversion layer is sandwiched between them. There was a problem that the electric wire connecting the solar battery cells was broken or peeled off at the interface between the thermoplastic resin and the polycarbonate substrate.

  The present invention solves the above problems, and the object of the present invention is to buckle solar cells and electric wires in the solar cell module during the production of the solar cell module and when used in an environment with a large temperature change. Another object is to provide a solar cell module in which power generation characteristics are not impaired by suppressing solar cell damage in the module.

  In solving the above-mentioned problems, the present inventors diligently studied. In sealing the photoelectric conversion layer with a sealing material between the surface protective layer and the back surface protective layer made of resin, the thermoplastic resin and the heat Used as a sealing material in combination with a curable resin, and by applying it to both sides of the photoelectric conversion layer on the sunlight receiving surface side and the sunlight non-light receiving surface side, the inside of the surface protective layer and the back surface protective layer It has been found that the stress applied to the photoelectric conversion layer due to the stress can be suppressed.

That is, the gist of the present invention resides in the following [1] to [4].
[1] A solar cell module in which a photoelectric conversion layer including one or more solar cells connected by an electric wire is laminated between a front surface protective layer and a back surface protective layer,
The material of the surface protective layer and / or the back surface protective layer includes a resin having a tensile elastic modulus of 0.5 GPa or more, a linear expansion coefficient of 30 ppm / K or more, and a total light transmittance of 80% or more,
The photoelectric conversion layer is embedded in a sealing material layer made of a thermoplastic resin, and the sealing material layer made of a thermosetting resin is disposed above the surface protective layer and the photoelectric conversion layer. The solar cell module laminated | stacked between the sealing material layer which consists of thermoplastic resins, and the layer which consists of this thermoplastic resin arrange | positioned under this photoelectric conversion layer, and the said back surface protective layer, respectively.
[2] The solar cell module according to [1], wherein the thermoplastic resin is a polyolefin resin, and the thermosetting resin is a crosslinkable or non-crosslinkable ethylene-vinyl acetate copolymer (EVA).
[3] The solar cell module according to [1] or [2], wherein a reinforcing layer is further laminated between the front surface protective layer and the rear surface protective layer.
[4] The solar cell module according to [3], wherein the reinforcing layer is disposed and laminated between the layer made of the thermoplastic resin and the layer made of the thermosetting resin.

  According to the solar cell module of the present invention, not only at the time of manufacturing the solar cell module, but also under a use situation where the deviation of the environmental temperature is large, the electric connector such as the interconnector connecting the solar cells does not break or buckle. In the solar cell module, the interconnector and the like are not peeled off, and the power can be stably generated.

It is a cross-sectional outline schematic which shows the one aspect | mode of the laminated constitution of the solar cell module of this invention. It is a cross-sectional outline schematic which shows the one aspect | mode of the laminated constitution of the solar cell module of this invention. It is a cross-sectional outline schematic which shows the one aspect | mode of the laminated constitution of the solar cell module of this invention. It is a cross-sectional outline schematic which shows the one aspect | mode of the laminated constitution of the solar cell module of this invention. It is a cross-sectional outline figure which shows the one aspect | mode of the layer structure of another solar cell module. It is a cross-sectional outline figure which shows the one aspect | mode of the layer structure of another solar cell module. It is a cross-sectional outline figure which shows the one aspect | mode of the layer structure of another solar cell module. It is a cross-sectional outline figure which shows the one aspect | mode of the layer structure of another solar cell module. It is a cross-sectional outline figure which shows the one aspect | mode of the layer structure of another solar cell module. It is a cross-sectional outline figure which shows the one aspect | mode of the layer structure of another solar cell module.

Embodiments of the solar cell module of the present invention will be specifically described below. The present invention is not limited to the following embodiments, and can be carried out by appropriately changing the embodiments within the scope of the gist thereof.
In the present specification, a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value. Moreover, the lower limit value or the upper limit value in this specification means a range including the value of the lower limit value or the upper limit value.

<Surface protective layer>
The surface protective layer of the solar cell module of the present invention will be described.
The surface protective layer of the solar cell module 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. The surface protective layer is not particularly limited, but a resin (hereinafter sometimes referred to as “resin (A)”) or glass is preferably used. Resin is more preferable from the viewpoint of light weight and resistance to cracking. From the viewpoint of supplying a large amount of sunlight to the photoelectric conversion layer, the total light transmittance of the resin (A) or glass is 80% or more, preferably 90% or more. The measurement method of the total light transmittance is, for example, JIS K
According to 7361-1.

  The linear expansion coefficient of the resin (A) is 30 ppm / K or more, preferably 40 ppm / K or more, and more preferably 50 ppm / K or more in the linear expansion coefficient at 30 to 80 ° C. On the other hand, as a linear expansion coefficient, although an upper limit is not specifically limited in the linear expansion coefficient in 0-30 degreeC, It is 200 ppm / K, Preferably it is 150 ppm / K, More preferably, it is 100 ppm / K. The linear expansion coefficient is measured by, for example, ASTM D696. If the linear expansion coefficient is less than 30 ppm / K, thermal expansion / contraction stress that requires a reinforcing layer tends not to occur. On the other hand, if it exceeds 200 ppm / K, the thermal expansion / contraction stress tends to be excessive.

The tensile elastic modulus of the resin (A) is 0.5 GPa or more, preferably 1 GPa or more, more preferably 1.5 GPa or more, and particularly preferably 2 GPa or more, at a tensile modulus of 23 ° C. On the other hand, in the tensile modulus at 23 ° C., the upper limit is not particularly limited, but is 5 GPa or less, and preferably 4 GPa or less. The measuring method of the tensile modulus is, for example, JIS K7161-1994 (tensile modulus of plastic), JIS K
7113 (plastic tensile test method), static test method (Ewing method), ultrasonic method, and the like. When the tensile modulus exceeds 5 GPa, the heat shrinkage stress tends to be excessive. On the other hand, when it is less than 0.5 GPa, the rigidity of the solar cell module of the present invention tends to be remarkably lowered.

  The resin (A) used for the surface protective layer is not particularly limited as long as it satisfies the above conditions. For example, polycarbonate (PC), polymethyl methacrylate (PMMA), cyclic polyolefin, polystyrene, polyethylene terephthalate ( PET), polyethylene naphthalate (PEN), ethylene-tetrafluoroethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), polypropylene (PP), polyethylene (PE) and the like. Preferably, fluorine-based resins such as ethylene-tetrafluoroethylene copolymer (ETFE) and polytetrafluoroethylene (PTFE) are used. More preferred are polycarbonate (PC), polymethyl methacrylate (PMMA), and polyethylene terephthalate (PET).

  The method for obtaining these resins is not particularly limited, and commercially available products can be used. For example, polycarbonate plates manufactured by Takiron Co., Ltd., “Iupilon” (registered trademark) manufactured by Mitsubishi Engineering Plastics Co., Ltd., polyacrylic methacrylate, “Acrylite (registered trademark)” manufactured by Mitsubishi Rayon Co., Ltd. “SUMIPEX (registered trademark)” manufactured by KK and ETFE include ETFE (model: 100HK-DCS) manufactured by Asahi Glass Co., Ltd.

Although the thickness of a surface protective layer is not specifically limited, Usually, it is 0.02 mm or more, Preferably it is 0.05 mm or more, More preferably, it is 0.1 mm or more. On the other hand, the upper limit is not particularly limited, but is preferably 10 mm or less, more preferably 5 mm or less, and most preferably 2 mm or less. By being in this range, moderate impact resistance and flexibility can be imparted.
In addition to these layers, a gas barrier layer, an ultraviolet cut layer, a weather resistant protective layer, an abrasion resistant layer, an antifouling layer, an electrical insulating layer, and other known constituent members may be laminated.

<Photoelectric conversion layer>
The photoelectric conversion layer of the solar cell module of the present invention will be described.
The photoelectric conversion layer of the solar cell module of the present invention is a layer that generates power based on sunlight incident from the light receiving surface side. The photoelectric conversion layer only needs to be capable of converting light energy into electric energy and taking out the electric energy obtained by the conversion to the outside.

The photoelectric conversion layer includes one or more solar cells, and the photoelectric conversion layer may be formed by connecting a plurality of solar cells with an electric wire (interconnector). The electric energy obtained in the photoelectric conversion layer can be taken out via an external converter through a collecting wire.
The material of the electric wire is not particularly limited, but it is preferable to use a highly conductive metal material. Specifically, silver, copper, aluminum, copper alloy, aluminum alloy, copper plated with tin, lead-free solder-coated copper wire, or the like can be used.

  Therefore, as a solar cell, a solar cell having a pair of electrodes sandwiching a power generation member, a solar cell having a pair of electrodes sandwiching a stack of a power generation member and another layer (buffer layer, etc.), and the like It is possible to use those including a plurality of such connected in series or / and in parallel.

  Various members can be used as the power generation member of the solar cell, but the power generation member is thin film single crystal silicon, thin film polycrystalline silicon, amorphous silicon, microcrystalline silicon, CdTe, Cu-In- (Ge). It is preferable to use an inorganic semiconductor material such as Se, an organic dye material such as a black die, or an organic semiconductor material such as a conjugated polymer / fullerene, but from the viewpoint of power generation efficiency, thin film single crystal silicon or thin film polycrystalline silicon The solar cell using is more preferable. For example, commercially available silicon solar cells may be used, and examples include solar cells such as those manufactured by Q-Cells, First Solar, Suntech, Sharp, Shinsung, Gintech, and Sunpower. . Further, a multi-junction photoelectric conversion layer, a HIT photoelectric conversion layer, or the like may be employed.

  In order to realize higher power generation efficiency, it is preferable to provide a sufficient light confinement structure, such as forming an uneven structure on the surface of the power generation member or a photoelectric conversion layer substrate described later that is installed as necessary. .

  If the power generation member is an amorphous silicon layer, a photoelectric conversion layer that has a large optical absorption coefficient in the visible region and can sufficiently absorb sunlight even in a thin-film solar cell having a thickness of about 1 μm can be realized. In addition, amorphous silicon, microcrystalline silicon, inorganic semiconductor materials, organic dye materials, and organic semiconductor materials are non-crystalline materials or materials with low crystallinity, and thus have resistance to deformation. Therefore, if the power generation member is provided with an amorphous silicon layer, a particularly lightweight solar cell module having a certain degree of resistance to deformation can be realized.

  If an inorganic semiconductor material (compound semiconductor) is used for the power generation member, a photoelectric conversion layer with high power generation efficiency can be realized. From the viewpoint of power generation efficiency (photoelectric conversion efficiency), the power generation member is preferably a chalcogenide-based power generation layer containing a chalcogen element such as S, Se, Te, and the I-III-VI2 group semiconductor system (chalcopyrite system) ) More preferably as a power generation member, a Cu-III-VI2 semiconductor power generation layer using Cu as a group I element, particularly a CIS semiconductor [CuIn (Se1-ySy) 2; 0 ≦ y ≦ 1] layer In addition, it is desirable to use a CIGS-based semiconductor [Cu (In1-xGax) (Se1-ySy) 2; 0 <x <1, 0 ≦ y ≦ 1] layer.

Even when a dye-sensitized power generation layer composed of a titanium oxide layer, an electrolyte layer, or the like is employed as the power generation member, a photoelectric conversion layer with high power generation efficiency can be realized.
As the power generation member, an organic semiconductor layer (a layer including a p-type semiconductor and an n-type semiconductor) can be employed. In addition, as a p-type semiconductor which can comprise an organic-semiconductor layer, a purophylline compound such as tetrabenzoporphyrin, tetrabenzocopper porphyrin, tetrabenzozinc porphyrin; a phthalocyanine compound such as phthalocyanine, copper phthalocyanine, zinc phthalocyanine; a polycene of tetracene or pentacene; Examples include oligothiophenes such as sexithiophene and derivatives containing these compounds as a skeleton. In addition, examples of p-type semiconductors that can form the organic semiconductor layer include polymers such as polythiophene including poly (3-alkylthiophene), polyfluorene, polyphenylene vinylene, polytriallylamine, polyacetylene, polyaniline, polypyrrole, and the like. .

  In addition, n-type semiconductors that can constitute the organic semiconductor layer include fullerenes (C60, C70, C76); octaaporphyrins; perfluoro compounds of the above p-type semiconductors; naphthalenetetracarboxylic anhydrides, nafullerenetetracarboxylics. Examples thereof include aromatic carboxylic acid anhydrides such as acid diimide, perylene tetracarboxylic acid anhydride, and perylene tetracarboxylic acid diimide, and imide compounds thereof; and derivatives containing these compounds as a skeleton.

  Further, as a specific configuration example of the organic semiconductor layer, a bulk heterojunction type having a layer (i layer) in which a p-type semiconductor and an n-type semiconductor are phase-separated in the layer, and a layer (p layer) each including a p-type semiconductor. And a layered type (hetero pn junction type), a Schottky type, and a combination thereof, in which layers containing an n-type semiconductor (n layer) are stacked.

  Each electrode 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, Containing dopants such as Lewis acids such as FeCl3, halogen atoms such as iodine, metal atoms such as sodium and potassium; conductive particles such as metal particles, carbon black, fullerene and carbon nanotubes in a matrix such as a polymer binder Examples include a dispersed conductive composite material.

This electrode material is preferably a material suitable for collecting holes or electrons. Examples of electrode materials suitable for collecting holes (that is, materials having a high work function) include Au, Ag, Cu, Al, ITO, IZO, and ZnO2. Moreover, Al can be illustrated as an electrode material suitable for electron collection (that is, a material having a low work function).
There is no restriction | limiting in particular also in the formation method of an electrode. Therefore, the electrodes can be formed by a dry process such as vacuum deposition or sputtering, or can be formed by a wet process using a conductive ink or the like. As the conductive ink, an arbitrary one (conductive polymer, metal particle dispersion, etc.) can be used.

  Each electrode of the solar battery cell may be substantially the same size as the power generation layer or may be smaller than the power generation layer. However, when the electrode on the light-receiving surface side of the solar battery cell is relatively large (the area is not sufficiently small compared to the power generation layer area), the electrode should be transparent ( The transmissivity of the light having a wavelength (for example, 300 to 1200 nm, preferably 500 to 800 nm) at which the electrode, particularly the power generation layer can be efficiently converted into electric energy, is relatively high (for example, 50% or more). ) Electrode. Examples of transparent electrode materials include oxides such as ITO and IZO (indium oxide-zinc oxide); metal thin films, and the like.

  In addition, the thickness of each electrode of the solar battery cell and the thickness of the photoelectric conversion layer can be determined based on the required output, etc., but if it is too thick, the electric resistance increases, and if it is too thin, it is durable. May decrease.

[Photoelectric conversion layer substrate]
A photoelectric conversion layer base material is a member in which a photovoltaic cell is formed on one surface thereof as needed. Therefore, it is desired that the photoelectric conversion layer base material has a relatively high mechanical strength, is excellent in weather resistance, heat resistance, water resistance, and the like, and is lightweight. It is also desirable that the photoelectric conversion layer base material has a certain degree of resistance to deformation. On the other hand, if the physical properties (for example, linear expansion coefficient, melting point, etc.) of the formed photovoltaic cell are significantly different, there is a risk of distortion or peeling at the interface after formation.

Therefore, as the photoelectric conversion layer substrate, it is preferable to employ a metal foil, a resin film having a melting point of 85 ° C. or higher or no melting point, and several metal foil / resin film laminates.
Examples of the metal foil that can be used as the photoelectric conversion layer substrate (or a component thereof) include foils made of aluminum, stainless steel, gold, silver, copper, titanium, nickel, iron, and alloys thereof.

  In addition, resin films having a melting point of 85 ° C. or higher or no melting point include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate, polyacetal, acrylic resin, polyamide resin, ABS resin. , ACS resin, AES resin, ASA resin, copolymers thereof, fluorine resin such as PVF, silicone resin, cellulose, nitrile resin, phenol resin, polyurethane, ionomer, polybutadiene, polybutylene, polymethylpentene, polyvinyl alcohol, polyarylate Examples thereof include films made of polyetheretherketone, polyetherketone, polyethersulfone, polyimide, and the like. From the viewpoint of productivity of the metal resin composite substrate, the resin is preferably a thermoplastic resin. The resin film used as the power generation element substrate is a film in which inorganic substances such as antimony oxide, antimony hydroxide, barium borate, glass fiber, organic fibers, carbon fibers, etc. are dispersed in the resin as described above. There may be.

  The reason why the melting point of the resin film used as the photoelectric conversion layer substrate (or its constituent elements) is preferably 85 ° C. or higher is that when the melting point is excessively low, the photoelectric conversion is performed under the normal use environment of the solar cell module. This is because the layer base material is deformed and may damage the photoelectric conversion layer.

  Accordingly, the melting point of the resin film used as the photoelectric conversion layer substrate (or its constituent elements) is more preferably 100 ° C. or higher, further preferably 120 ° C. or higher, and more preferably 150 ° C. or higher. Particularly preferred is 180 ° C. or higher. The thermal expansion coefficient of the photoelectric conversion layer is not particularly limited, but is preferably 40 ppm / K or less, more preferably 35 ppm / K or less, and particularly preferably 30 ppm / K or less. The measuring method of the thermal expansion coefficient is, for example, according to ASTM D696. When the thermal expansion coefficient exceeds 40 ppm / K, deformation due to temperature change is large, and therefore, it tends to be liable to fail under heating / cooling processes or actual use conditions. On the other hand, the lower limit is not particularly limited, but is usually −5 ppm / K or more, preferably 0 ppm / K or more.

<Back side protective layer>
The back surface protective layer of the solar cell module of the present invention will be described.
The back surface protective layer is a layer for imparting mechanical strength, weather resistance, scratch resistance, chemical resistance, gas barrier properties, and the like. As a material for the back surface protective layer, a resin (hereinafter sometimes referred to as “resin (B)”), glass, metal, or a metal-resin composite material is preferably used as the material. From the viewpoint of balance between lightness and rigidity, a metal-resin composite material is more preferable.

The linear expansion coefficient of the resin (B) used for the back surface protective layer is 30 ppm / K or more, preferably 40 ppm / K or more, more preferably 50 ppm / K or more in the linear expansion coefficient at 30 to 80 ° C. It is. On the other hand, although an upper limit is not specifically limited, It is 200 ppm / K, Preferably it is 150 ppm / K, More preferably, it is 100 ppm / K. The linear expansion coefficient is measured by, for example, ASTM D696. If the linear expansion coefficient is less than 30 ppm / K, thermal expansion / contraction stress that requires a reinforcing layer tends not to occur. On the other hand, if it exceeds 200 ppm / K, the thermal expansion / contraction stress tends to be excessive.

The tensile elastic modulus of the resin (B) is 0.5 GPa or more, preferably 1 GPa or more, more preferably 1.5 GPa or more, and particularly preferably 2 GPa or more, at a tensile modulus of 23 ° C. On the other hand, in the tensile modulus at 23 ° C., the upper limit is not particularly limited, but is 5 GPa or less, and preferably 4 GPa or less. The measuring method of the tensile modulus is, for example, JIS K7161-1994 (tensile modulus of plastic), JIS K
7113 (plastic tensile test method), static test method (Ewing method), ultrasonic method, and the like. When the tensile modulus exceeds 5 GPa, the heat shrinkage stress tends to be excessive. On the other hand, when it is less than 0.5 GPa, the rigidity of the solar cell module of the present invention tends to be remarkably lowered.

  Examples of such resins include polycarbonate (PC) resin, polymethyl methacrylate (PMMA), glass epoxy multilayer material, fiber reinforced plastic (FRP), cyclic polyolefin, polystyrene, polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). ), Polyimide (PI), ethylene-tetrafluoroethylene copolymer (ETFE), and the like. Preferred examples include polycarbonate (PC) resin, polymethyl methacrylate (PMMA), glass epoxy multilayer material, polyethylene terephthalate (PET), and ethylene-tetrafluoroethylene copolymer (ETFE). More preferred are polycarbonate (PC), polymethyl methacrylate (PMMA), and polyethylene terephthalate (PET).

The back surface protective layer may have a multilayer structure using a plurality of these resins. In that case, it is preferable to provide a sealing material layer between the layers.
When a metal plate is used as a material for increasing the back surface protection, the specific material is not particularly limited, but iron, galvalume steel, stainless steel, copper, aluminum, titanium, Invar alloy or these are galvanized. Things. The reason for this is that it is inexpensive, has processability, has high rigidity, and has high thermal conductivity, so that heat does not easily accumulate in the solar cell module. In particular, aluminum is preferable because the specific gravity is small and thus the weight of the solar cell module can be reduced and the thermal conductivity is excellent. Therefore, the effect of suppressing the power generation efficiency of the photoelectric conversion layer accompanying the temperature rise is high. These metal plates may be used singly or in combination of two or more.

Although the thickness of a metal plate is not specifically limited, Usually, it is the range of 0.05-3.0 mm, the range of 0.1-1.0 mm is preferable, and the range of 0.15-0.3 mm is more preferable. If the thickness is too small, the rigidity of the entire solar cell module is reduced, and if it is too thick, the weight of the entire solar cell module becomes too heavy.
When a metal-resin composite material is used as a material for increasing the back surface protection, it is preferable to include two or more metal plates, and it is also possible to use two or more metal plates in a stacked manner. In the case of using two or more metal plates, it is particularly preferable to use a metal-resin composite plate in which a resin layer described later is sandwiched between the metal plates.

The thickness of this resin layer is in the range of 0.5 to 200 mm, preferably in the range of 0.7 to 100 mm, more preferably in the range of 1.0 to 10 mm, and particularly preferably in the range of 1.5 to 200 mm. 5.0 mm. If this thickness is too thin, the rigidity improvement effect may be reduced, and if it is too thick, the workability may be reduced due to an increase in the weight or size of the solar cell module.
As the material of the resin layer, polyolefin resins such as polyethylene or polypropylene are usually preferably used, but ethylene-vinyl acetate copolymer, polyethylene terephthalate, nylon, and a mixture of various resins may be used. . If desired, various flame retardants, various fillers such as talc, calcium carbonate, magnesium hydroxide, aluminum hydroxide, and calcium silicate, stabilizers, colorants, crosslinking agents, foaming agents, and the like may be added to the resin.

In addition, the resin layer can be used as a multilayer structure using two or more kinds of resins, not a single layer using only one kind of resin. For example, a three-layer structure in which a resin layer having a thin adhesive property is laminated on both surfaces of a thick resin sheet forming the center can also be used.
Specific examples of the metal-resin composite plate include Alpolic (registered trademark) (manufactured by Mitsubishi Plastics Co., Ltd.) having excellent physical properties such as light weight and high rigidity. Alpolic (registered trademark; manufactured by Mitsubishi Plastics, Inc.) has a three-layer structure. Polyolefin such as polyethylene or polypropylene is used as the material of the resin layer, and the metal sheet sandwiching the resin layer is made of aluminum. Aluminum -Polyolefin composite board. The metal-resin composite plate can be produced according to a known method.

From the viewpoint of lightness and resistance to cracking, the resin (A) or resin (B) material is preferably used for either of the front and back protective layers of the module according to the present invention, and is used for both the front and back protective layers. Is most preferred.
However, from the viewpoint of rigidity, a particularly preferable combination is one in which the material of the surface protective layer contains the resin (A) and the material of the back protective layer contains a metal-resin composite material.

<Encapsulant layer>
The sealing material layer of the solar cell module of the present invention will be described. The sealing material layer integrates the constituent layers (surface protective layer, photoelectric conversion layer, back surface protective layer, reinforcing layer, etc.) of the solar cell module of the present invention. It is a component for reinforcing the photoelectric conversion layer while being used for the purpose. Since the photoelectric conversion layer is thin, it usually tends to be easily broken, but it is difficult to break with a sealing material, and the reliability as a solar cell module can be maintained high.

In addition, the sealing material layer can maintain high reliability such as shock absorption (flexibility), adhesion to front and back protective layers, waterproofness, heat resistance, and mechanical strength (bending, tension, compression, etc.). is there.
The sealing material layer also functions to make it difficult to transmit the thermal deformation stress of the surface protective layer and the back surface protective layer to the photoelectric conversion layer. From this viewpoint, the sealing material in contact with the surface protective layer and the back surface protective layer preferably has a low elastic modulus. Preferably, the elastic modulus at 25 ° C. is preferably 100 MPa or less, more preferably 50 MPa or less, and most preferably 20 MPa or less. However, from the viewpoint of maintaining the sealing performance, the lower limit is preferably 0.1 MPa or more, more preferably 1 MPa or more, and most preferably 2 MPa or more.

  Further, the sealing material layer in contact with the photoelectric conversion layer preferably has a high elastic modulus in order to withstand the thermal deformation stress of the surface protective layer and the back surface protective layer. Preferably, the elastic modulus at 70 ° C. is preferably 4 MPa or more, more preferably 7 MPa or more, and most preferably 10 MPa or more. However, from the viewpoint of suppressing breakage of the photoelectric conversion layer, the upper limit at 25 ° C. is preferably 5000 MPa or less, more preferably 2000 MPa or less, and most preferably 1000 MPa or less.

Further, the sealing material is preferably one that transmits visible light from the viewpoint of not hindering light absorption of the photoelectric conversion layer. For example, the transmittance of visible light (wavelength 360 to 830 nm) is usually 60% or more, preferably 70% or more, more preferably 75% or more, still more preferably 80% or more, and particularly preferably 85% or more. Preferably it is 90% or more, Especially preferably, it is 95% or more, Especially preferably, it is 97% or more. This is to convert more sunlight into electrical energy.

  In the solar cell module of the present invention, the photoelectric conversion layer is embedded in a sealing material layer made of a thermoplastic resin, and the sealing material layer made of a thermosetting resin has the surface protective layer and the photoelectric conversion layer. Laminated between the sealing material layer made of the thermoplastic resin arranged on the upper side of the layer and between the layer made of the thermoplastic resin arranged on the lower side of the photoelectric conversion layer and the back surface protective layer. It is characterized by. The photoelectric conversion layer is embedded in an encapsulant layer made of a thermoplastic resin. In the cross-sectional view of the solar cell module, the encapsulant layer made of a thermoplastic resin is a layer in contact with the upper and lower sides of the photoelectric conversion layer. When the area of the photoelectric conversion layer as viewed from the sunlight receiving surface is smaller than the area of the sealing material layer, sealing with a thermoplastic resin at the end of the photoelectric conversion layer is performed by thermal lamination. The material layers are in contact with each other, and in the cross-sectional view, it appears that the photoelectric conversion layer is embedded in the sealing material layer.

  The encapsulant layer made of a thermosetting resin has the advantages of excellent flexibility before thermosetting, less damage to the photoelectric conversion layer during thermal lamination, and excellent heat resistance and adhesion stability. For example, when the viscoelasticity at 70 ° C. is A and the viscoelasticity at 100 ° C. is B, the value of B / A is preferably 50% or more, more preferably 60% or more, and most preferably 75% or more. . However, there is shrinkage due to thermal crosslinking, etc. Further, when the thermoformed module is cooled to room temperature, the surface protective layer and the back surface protective layer are thermally contracted, and internal stress is generated by the surface protective layer and the back surface protective layer, and the solar cell Compresses the interconnector in the module, which tends to cause buckling. Further, since it is considered that the same phenomenon occurs even in an environment where the temperature change is large, there is a possibility that the interconnector of the solar cell module is disconnected.

  The sealing material layer made of thermoplastic resin is not shrunk due to thermal crosslinking or the like, and the solidifying temperature is lower than the thermoforming temperature, so that the internal stress due to heat shrinkage of the surface protective layer and the back surface protective layer is thermosetting resin. Compared to the case where is used, it is difficult to be transmitted to the photoelectric conversion layer. Therefore, the force which compresses the interconnector in a solar cell module becomes small, and it is hard to generate | occur | produce a buckling and a disconnection. However, since heat resistance is expressed without crosslinking, the flexibility is low at low temperatures, and the photoelectric conversion layer is easily damaged during thermal lamination. Also, the adhesion stability is inferior to thermosetting resins.

  By combining these sealing materials, a layer made of a thermosetting resin and a layer made of a thermoplastic resin are used as a sealing material layer between the surface protective layer and the photoelectric conversion layer, and the photoelectric conversion layer and the back surface protection. By laminating the layers between the layers, there is an advantage of reducing the effect of damaging the photoelectric conversion layer during the thermal lamination of the thermoplastic resin. In addition, the adhesiveness of the solar cell module can be improved while suppressing the internal stress to the photoelectric conversion layer due to the thermal contraction of the front surface protective layer and the back surface protective layer, thereby suppressing the breakage of the interconnector and the peeling inside the solar cell module. Is possible.

  In particular, in solar cell modules that require adhesion stability at high temperatures, the cells have high rigidity and low linear expansion, so there is no problem with thermoplastic resins with slightly inferior adhesion. Has high rigidity and linear expansion, so that followability and adhesiveness are required, and it is preferable to use a thermosetting sealing material at the interface between the surface protective layer and the back surface protective layer. Therefore, a preferable layer configuration of the solar cell module of the present invention is that a layer made of a thermoplastic resin laminated between the surface protective layer and the photoelectric conversion layer and between the photoelectric conversion layer and the back surface protective layer is a photoelectric conversion layer. The layers made of thermosetting resin are arranged in contact with each other so as to embed the photoelectric conversion layer, and the layers made of the thermosetting resin are between the thermoplastic resin and the surface protective layer, and between the thermoplastic resin and the back surface protective layer. A structure in which the layers are stacked in between is preferable.

As a result, it is possible to obtain a module that has excellent adhesion stability and is resistant to buckling and disconnection of the interconnector due to cold heat.
The sealing material is a resin material having a relatively high solar transmittance, such as polyethylene, polypropylene, crosslinkable or non-crosslinkable ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer. Polyolefin resin such as coalescence, ethylene-ethyl acrylate copolymer, propylene-ethylene-α-olefin copolymer, butyral resin, styrene resin, epoxy resin, (meth) acrylic resin, urethane resin, silicone resin, synthetic rubber, etc. Can be used.

Among these, as a sealing material for a layer made of a thermosetting resin, a crosslinkable or non-crosslinkable ethylene-vinyl acetate copolymer (EVA) is preferable, and a layer made of a thermoplastic resin is sealed. The stopper is preferably a polyolefin resin such as a propylene-ethylene-α-olefin copolymer.
As these materials, commercially available materials may be used. As specific examples, thermosetting EVA sealing material manufactured by CI Kasei Co., Ltd., thermoplastic EVA sealing material manufactured by Koshin Rubber Co., Ltd., Examples thereof include a modified polyolefin sealing material manufactured by Nippon Printing Co., Ltd. and a modified polyolefin sealing material manufactured by Mitsubishi Plastics (Proceria (registered trademark)).

<Reinforcing layer>
The reinforcing layer of the solar cell module of the present invention will be described.
In the solar cell module of the present invention, it is preferable that a reinforcing layer is further laminated in addition to the above layers. A reinforcement layer is a component for making it difficult to transmit the thermal deformation stress of a surface protective layer or a back surface protective layer by a photoelectric converting layer.

This reinforcing layer is arranged between the surface protective layer and the photoelectric conversion layer (hereinafter sometimes referred to as “reinforcing layer 1”), and between the photoelectric conversion layer and the back surface protective layer. There is a reinforcing layer (hereinafter sometimes referred to as “reinforcing layer 2”), and in the solar cell module of the present invention, either one may be included, but both are more preferable. .
Since the above-mentioned photoelectric conversion layer is thin, it is usually easily broken, and thus the reliability of the solar cell module tends to be lowered. However, the reliability can be maintained higher by the reinforcing layer.
Further, the reinforcing layer can maintain higher reliability in heat resistance and mechanical strength (bending, tension, compression, etc.).

From this point of view, it is preferable that the reinforcing layers (reinforcing layer 1 and reinforcing layer 2) are within a certain range of linear expansion coefficient and Young's modulus.
First, as the linear expansion coefficient, the linear expansion coefficient at −30 to 30 ° C. is preferably 1 to 30 ppm / K, more preferably 1 to 25 ppm / K, and still more preferably 1 to 20 ppm / K. . 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 30 ppm / K, thermal deformation of the reinforcing layer itself tends to increase and the reinforcing effect tends to decrease. On the other hand, when it is less than 1 ppm / K, the coefficient of linear expansion may be smaller than the side (inorganic roofing material, metal frame, etc.) on which the solar cell module is fixed, which may have an adverse effect.

The Young's modulus at 23 ° C. is 1 to 200 GPa, preferably 6 to 150 GPa, more preferably 10 to 120 GPa, and still more preferably 20 to 100 GPa. As this value increases, the reinforcing effect tends to increase. When the Young's modulus is less than 1 GPa, the reinforcing effect tends to decrease.
In the reinforcing layer of the present invention, the area of the laminated surface (the area of the surface perpendicular to the thickness direction) is preferably 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 smaller than the area of the laminated surface of a surface protective layer and a back surface protective layer. 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 (reinforcing layer 1, reinforcing layer 2) is not particularly limited as long as it satisfies the above conditions. However, since the reinforcing layer is disposed on the light receiving surface side with respect to the photoelectric conversion layer, light transmission is possible. Since it is necessary to use a material having high properties, it is preferable to use thin plate glass, high-strength plastic (stretched polyethylene terephthalate (stretched PET), stretched polyethylene naphthalate (stretched PEN), polyimide, polyphenylene sulfide, phenol resin, or these glasses. Or a carbon fiber reinforced product).

In addition, since the reinforcing layer 2 is not on the light receiving surface side, in addition to the above materials, metals (aluminum, iron, stainless steel, copper, brass, galvalume steel plate, etc.), metal oxides of these metals, inorganic oxides (Silicon oxide, alumina, zinc oxide, zirconia, forsterite, steatite, cordierite, sialon, zircon, ferrite, mullite, etc.) can also be suitably used.
The thickness of the reinforcing layer is not particularly limited, but is usually 10 μm or more, preferably 50 μm or more, and more preferably 100 μm or more. On the other hand, the upper limit is usually 1000 μm or less, preferably 500 μm or less.

<Method for manufacturing solar cell module>
As a method for producing the solar cell module of the present invention, a known method can be used. 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 is also improved, it is preferable.

The heat lamination may be carried out under a normal pressure of 50 kPa or more, preferably 70 kPa or more, more preferably 90 kPa or more. On the other hand, the upper limit is preferably 200 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 temperature condition of the heat laminate is usually 80 ° C. or higher, preferably 100 ° C. or higher, more preferably 120 ° 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.

  Moreover, the press 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 heat time, since a sealing material is bridge | crosslinked moderately, durability performance improves and it can have moderate softness | flexibility, and is preferable.

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.
In the examples, regarding the thermosetting resin and the thermoplastic resin used as the material of the sealing material layer, the glass transition temperature (Tg), melting temperature (Tm), and elastic modulus (storage elastic modulus (E The measurement method of ')) and the method of the temperature cycle test of the solar cell module manufactured in each example are as follows.

[Glass transition temperature (Tg) and melting temperature (Tm)]
Differential scanning calorimetry (DSC heating rate 10 ° C./min, measurement from −100 ° C. to 150 ° C.) was performed using a differential scanning calorimeter [SSC / 5200 manufactured by SII], and Tg and Tm temperature were measured. The measurement results are shown in Table 1.

[Elastic modulus (storage modulus (E '))
Temperature dispersion measurement (vibration frequency: 10 Hz, heating rate: 2 ° C./min, strain 0.05%) using a dynamic viscoelasticity measuring device (RSAIII, manufactured by TA Instruments) The elastic modulus (E ′) was measured from −100 ° C. to 100 ° C.), and the storage elastic modulus (E ′) at 25 ° C., 70 ° C., and 100 ° C. of each sealing material was measured. The measurement results are shown in Table 1. However, the viscoelasticity at 25 ° C. of the modified polyolefin sheet (PO) F6000 manufactured by Mitsubishi Plastics is the measurement result at 30 ° C.

<Temperature cycle>
Constant temperature and humidity chamber equipment (built-in chamber TBE-12H30W2P2AJL, ESP
The temperature was raised and held from 23 ° C. to 80 ° C., lowered and held at −40 ° C., then raised to 80 ° C. and reached 23 ° C. as one cycle. Each detailed condition is as follows.
(1) Heating time from 23 ° C to 80 ° C is 65 minutes, holding time at 80 ° C is 145 minutes (2) Temperature falling time from 80 ° C to -40 ° C is 295 minutes, holding time at -40 ° C is 65 minutes ( 3) The temperature rising time from −40 ° C. to 80 ° C. is 165 minutes, and the holding time at 80 ° C. is 45 minutes. The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples. Needless to say.

<Example 1>
A solar cell module having the layer configuration shown in FIG. 1 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFCCE40), 400 mm long, 200 mm wide, and a sealing material sheet made of thermoplastic resin having a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74) are sequentially laminated, On top of that, two 6-inch single crystal silicon cells (Shinsung, SH-1990S3) are placed with a gap of 4 mm. It was. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), a length of 400 mm A sheet of a sealing material made of a thermosetting resin having a width of 200 mm and a thickness of 0.4 mm (CAI Kasei Co., Ltd., EVAUFHCE40), as a surface protective layer, an acrylic film-clad polycarbonate plate (manufactured by Ryojo Techno Co., Ltd., thickness 0 A laminate on which a .07 mm acrylic film was heat-sealed on one side of a polycarbonate sheet and the acrylic surface was directed to the sunlight receiving surface was placed on a vacuum laminator (NLM-270 × 400, manufactured by NPC). I put it in. First inside the laminator 1 under reduced pressure
After holding for 0 minute, the solar cell module 1 was obtained by holding the laminated body at 130 ° C. for 40 minutes while maintaining the pressure-bonded state at atmospheric pressure. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, the solar cell 1 was inspected, and it was found that there was no buckling of the interconnector, no damage to the cells, There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (16 cycles), and there was no separation of the sealing material and the interconnector.

<Example 2>
A solar cell module having the layer configuration shown in FIG. 2 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermoplastic resin sealing A sheet of stop material (manufactured by Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74) is sequentially laminated, and 6 Inch single-crystal silicon cell was placed (Shinsung Ltd., SH-1990S3) two spaced between 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), a length of 400 mm 200 mm wide, 0.125 mm thick PET sheet (Q1C15 manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin sheet (Cai Kasei Co., Ltd.) Manufactured by EVAUFHCE40), as a surface protection layer, an acrylic film-clad polycarbonate plate (manufactured by Ryohin Techno Co., Ltd., a heat-sealed acrylic film having a thickness of 0.07 mm on one side of a polycarbonate sheet, the acrylic surface facing the sunlight receiving surface side) Was put into a vacuum laminator (NPC, NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 2. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, the solar cell 2 was inspected. As a result, the interconnector did not buckle, the cell was not damaged, the sealing material and There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (16 cycles), and there was no separation of the sealing material and the interconnector.

<Example 3>
A solar cell module having the layer configuration shown in FIG. 2 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFCCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.45 mm thick thermoplastic resin sealing A sheet of stop material (Mitsubishi Resin, modified polyolefin sheet (PO) F2000) is laminated in order, Inch single-crystal silicon cell was placed (Shinsung Ltd., SH-1990S3) two spaced between 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.45 mm (Mitsubishi Resin, modified polyolefin sheet (PO) F2000), a length of 400 mm, a width 2
00 mm, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.4 mm thick sealing material sheet made of thermosetting resin (Ci Kasei Co., Ltd., EVAUFHCE40), as a surface protection layer, an acrylic film-clad polycarbonate plate (manufactured by Ryohin Techno Co., Ltd., a heat-sealed acrylic film having a thickness of 0.07 mm on one side of a polycarbonate sheet, the acrylic surface facing the sunlight receiving surface side ) Was placed in a vacuum laminator (NLM, NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 3. After cooling for 10 minutes and cooling from 130 ° C. to 30 ° C., an appearance inspection of the solar cell 3 was performed. As a result, the interconnector did not buckle, the cell was not damaged, and the sealing material There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (16 cycles), and there was no separation of the sealing material and the interconnector.

<Example 4>
A solar cell module having the layer configuration shown in FIG. 2 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFCCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.45 mm thick thermoplastic resin sealing A sheet of stop material (Made by Mitsubishi Plastics, modified polyolefin sheet (PO) F6000) is sequentially laminated, Inch single-crystal silicon cell was placed (Shinsung Ltd., SH-1990S3) two spaced between 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.45 mm (made by Mitsubishi Plastics, modified polyolefin sheet (PO) F6000), a length of 400 mm, a width 200 mm, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.4 mm thick sealing material sheet made of thermosetting resin (Ci Kasei Co., Ltd., EVAUFHCE40), as a surface protection layer, an acrylic film-clad polycarbonate plate (manufactured by Ryohin Techno Co., Ltd., a heat-sealed acrylic film having a thickness of 0.07 mm on one side of a polycarbonate sheet, the acrylic surface facing the sunlight receiving surface side ) Is put in a vacuum laminator (NPC, NLM-270 × 400). . First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 3. After cooling for 10 minutes and cooling from 130 ° C. to 30 ° C., an appearance inspection of the solar cell 3 was performed. As a result, the interconnector did not buckle, the cell was not damaged, and the sealing material There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (16 cycles), and there was no separation of the sealing material and the interconnector.

<Example 5>
A solar cell module having the layer configuration shown in FIG. 3 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermoplastic resin sealing Stop sheet (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), length 400 mm, width 200 m , 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick sealing material sheet (Dai Nippon Printing Co., Ltd., modified polyolefin sheet) (PO) 74) were sequentially laminated, and two 6-inch single crystal silicon cells (manufactured by Shinsung, SH-1990S3) were arranged on the top with a gap of 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), a length of 400 mm 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.4 mm thick sealing material sheet made of thermoplastic resin (Dai Nippon Printing Co., Ltd., Modified polyolefin sheet (PO) Z74), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin Sheet of sealing material (Cai Kasei Co., Ltd., EVAUFHCE40), surface protective layer, acrylic film-coated poly -A laminate with a Bonate plate (manufactured by Ryojo Techno Co., Ltd., heat-sealed acrylic film with a thickness of 0.07 mm on one side of a polycarbonate sheet, with the acrylic surface facing the sunlight-receiving surface side), a vacuum laminator ( NLM, NLM-270 × 400). First, the inside of the laminator was held for 10 minutes under reduced pressure, and then the laminated body 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 4. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, the appearance inspection of the solar cell 4 was performed. As a result, the interconnector did not buckle, the cell was not damaged, the sealing material and There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (32 cycles), and there was no separation of the sealing material and the interconnector.

<Example 6>
A solar cell module having the layer configuration shown in FIG. 4 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin Sheet of sealing material (CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFCCE40), length 4 PET sheet (Q1C15, manufactured by Toyobo Co., Ltd., Q1C15) having a thickness of 0 mm, a width of 200 mm, and a thickness of 0.125 mm, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.45 mm (Dai Nippon Printing Co., Ltd.) , Modified polyolefin sheet (PO) Z74) were sequentially laminated, and two 6-inch single-crystal silicon cells (manufactured by Shinsung, SH-1990S3) were disposed on each of them with a gap of 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.45 mm (made by Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), a length of 400 mm 200 mm wide, 0.125 mm thick PET sheet (Q1C15 manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin sheet (Cai Kasei Co., Ltd.) , Ethylene-vinyl acetate copolymer (EVA) UFCCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick A sheet of a sealing material made of a thermosetting resin (EVAUFHCE40, manufactured by CI Kasei Co., Ltd.), a surface protective layer, A laminate on which a polycarbonate plate with a rill film (made by Ryohin Techno Co., Ltd., a heat-sealed acrylic film having a thickness of 0.07 mm on one side of a polycarbonate sheet, the acrylic surface facing the sunlight receiving surface side) It put into the vacuum laminator (the product made by NPC, NLM-270 * 400). First, the inside of the laminator was held for 10 minutes under reduced pressure, and then the laminated body 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 5. After cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, an appearance inspection of the solar cell 5 was performed. As a result, the interconnector did not buckle, the cell was not damaged, the sealing material and There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (32 cycles), and there was no separation of the sealing material and the interconnector.

<Example 7>
A solar cell module having the layer configuration shown in FIG. 2 was prepared by the following procedure.
Specifically, the back protective layer is 890 mm long, 680 mm wide, and 2 mm thick.
Metal-resin composite plate (manufactured by Mitsubishi Plastics Co., Ltd., ALPOLIC 215PE with a 1.7 mm thick polyethylene resin sheet sandwiched between two 0.15 mm thick metal plates), 890 mm long, horizontal A sheet of sealing material made of a thermosetting resin having a thickness of 680 mm and a thickness of 0.4 mm (manufactured by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFCCE40), length 890 mm, width 680 mm, thickness 0.125 mm A PET sheet (Toyobo Co., Ltd., Q1C15), a sheet of sealing material made of a thermoplastic resin having a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74) The 6-inch single-crystal silicon cells (manufactured by TSEC, TSS62TNO-T186) are stacked on top of each other. Solder coated wires (width 5 mm, thickness 0.18 mm) side by side a concatenation of three terpolymers connectors 4 rows of those electrically connected in 20 series was a photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm (manufactured by Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), a length of 890 mm , PET sheet having a width of 680 mm and a thickness of 0.125 mm (Q1C15, manufactured by Toyobo Co., Ltd.), a sheet of a sealing material made of a thermosetting resin having a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm (CI Chemical Co., Ltd.) Made of ethylene-vinyl acetate copolymer (EVA) UFHCE40), and a laminate on which an ETFE film (manufactured by Asahi Glass Co., Ltd., 100HK-DCS) having a length of 890 mm, a width of 680 mm, and a thickness of 0.1 mm is applied as a surface protective layer. It put into the vacuum laminator (the product made by NPC, NLM-270 * 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, when the appearance inspection of the solar cell 6 was performed, there was no buckling of the interconnector, no damage to the cell, There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (32 cycles), and there was no separation of the sealing material and the interconnector.

<Example 8>
A solar cell module having the layer configuration shown in FIG. 2 was prepared by the following procedure.
Specifically, the back protective layer is 890 mm long, 680 mm wide, and 2 mm thick.
Metal-resin composite plate (manufactured by Mitsubishi Plastics Co., Ltd., ALPOLIC 202PE with a 1.6 mm thick polyethylene resin sheet sandwiched between two 0.2 mm thick aluminum plates), 890 mm long, horizontal A sheet of sealing material made of a thermosetting resin having a thickness of 680 mm and a thickness of 0.4 mm (manufactured by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFCCE40), length 890 mm, width 680 mm, thickness 0.125 mm PET sheet (Toyobo Co., Ltd., Q1C15), sealing material sheet (Mitsubishi Resin, modified polyolefin sheet (PO) F6000) made of thermoplastic resin with a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm are sequentially laminated. On top of that, 5 pieces of 6-inch single crystal silicon cells (manufactured by TSEC, TSS62TNO-T186) are installed. Solder coated wires (width 5 mm, thickness 0.18 mm) side by side the concatenation of the two over the connector in four rows of those electrically connected in 20 series and the photoelectric conversion layer. Further, on the photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm (Mitsubishi Resin, modified polyolefin sheet (PO) F6000), a length of 890 mm, a width 680 mm, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 890 mm long, 680 mm wide, 0.4 mm thick sealing material sheet made of thermosetting resin (Ci Kasei Co., Ltd., A laminated body on which an ETFE film (manufactured by Asahi Glass Co., Ltd., 100HK-DCS) having a length of 890 mm, a width of 680 mm, and a thickness of 0.1 mm as a surface protective layer was formed as a vacuum laminator. (NPC, NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 7. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, an appearance inspection of the solar cell 7 was performed. As a result, the interconnector did not buckle, the cell was not damaged, and the sealing material There was no peeling of the interconnector. There was no disconnection of the interconnector and cell damage after the temperature cycle (32 cycles), and there was no separation of the sealing material and the interconnector.

<Comparative Example 1>
A solar cell module having the layer configuration shown in FIG. 5 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFHCE40), sheet of sealing material made of thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFHCE40) ) Are stacked one after the other, and 4 pieces of 6 inch single crystal silicon cells (manufactured by Shinsung, SH-1990S3) They were spaced between the m. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on this photoelectric conversion layer, a sheet of a sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA ) UFHCE40), 400 mm long, 200 mm wide, 0.4 mm thick sealing material sheet (EVAUFHCE40, manufactured by CI Kasei Co., Ltd.), and an acrylic film-clad polycarbonate plate (Rhishi) A laminated body on which a techno-made acrylic film with a thickness of 0.07 mm was heat-sealed on one side of a polycarbonate sheet, with the acrylic surface facing the sunlight-receiving surface side, was a vacuum laminator (NPC, NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 8. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, when the appearance inspection of the solar cell 8 was performed, the interconnector was buckled in the vicinity of the cell, but the cell was not damaged. There was no peeling of the sealing material and the interconnector. After the temperature cycle (16 cycles), the interconnector was disconnected. There was no damage to the cell, and there was no peeling of the sealing material and the interconnector.

<Comparative Example 2>
A solar cell module having the layer configuration shown in FIG. 6 was prepared by the following procedure.
Specifically, as a back surface protective layer, a polycarbonate plate with an acrylic film having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO)) Z74), 400m long
m, 200 mm wide, 0.4 mm thick sealing material sheet made of thermoplastic resin (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74) is laminated in order, and then a 6-inch single crystal silicon cell Two pieces (manufactured by Shinsung, SH-1990S3) were arranged with a gap of 4 mm. Both single crystal silicon cells were connected by three interconnectors, and this was used as a photoelectric conversion layer. Further, on this photoelectric conversion layer, a sheet of a sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), a length of 400 mm A sheet of sealing material made of a thermoplastic resin having a width of 200 mm and a thickness of 0.4 mm (manufactured by Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), an acrylic film-clad polycarbonate plate (manufactured by Ryohin Techno Co., Ltd., thickness 0. A laminate on which a 07 mm acrylic film was heat-sealed on one side of a polycarbonate sheet, with the acrylic surface facing the sunlight-receiving surface side) was put into a vacuum laminator (NLM, NLM-270 × 400) did. First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 9. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, the solar cell 9 was inspected, and this was not buckled by the interconnector but was damaged by the cell. There was no peeling of the interconnector. Although there was no disconnection of the interconnector after the temperature cycle (16 cycles), the cells were more damaged, and the sealing material and the interconnector were separated.

<Comparative Example 3>
A solar cell module having the layer configuration shown in FIG. 7 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin Sheets of sealing materials (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFHCE40) sequentially The layers, thereon 6 inches monocrystalline silicon cells arranged (Shinsung Ltd., SH-1990S3) two spaced between 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on this photoelectric conversion layer, a sheet of a sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA ) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15 manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin sheet (Cai Kasei Co., Ltd., EVAUFHCE40), and as a surface protective layer, an acrylic film-clad polycarbonate plate (manufactured by Ryojo Techno Co., Ltd., heat-sealed acrylic film having a thickness of 0.07 mm to one surface of a polycarbonate sheet, acrylic surface The laminated body on which the solar light receiving surface side is placed is a vacuum laminator (NLM-2, manufactured by NPC). It was placed in a 0 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 10. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, the solar cell 10 was inspected. As a result, the interconnector was buckled near the cell, but the cell was not damaged. There was no peeling of the sealing material and the interconnector. After the temperature cycle (cycle 16), the interconnector was disconnected. There was no damage to the cell, and there was no peeling of the sealing material and the interconnector.

<Comparative Example 4>
A solar cell module having the layer configuration shown in FIG. 8 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermoplastic resin having a length of 400 mm, a width of 200 mm and a thickness of 0.4 mm (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO)) Z74), a sheet of encapsulant made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.125 mm (Toyobo Co., Ltd., Q1C15), a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm. Sei Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFHCE40) was sequentially laminated, and 6 Inch single-crystal silicon cell was placed (Shinsung Ltd., SH-1990S3) two spaced between 4 mm. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on this photoelectric conversion layer, a sheet of a sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA ) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, a sealing material sheet made of 0.4 mm thick thermoplastic resin ( Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), and as a surface protective layer, an acrylic film-clad polycarbonate plate (manufactured by Ryohin Techno Co., Ltd., 0.07 mm thick acrylic film was heat-sealed to one side of the polycarbonate sheet. A laminated body with an acrylic surface facing the solar light receiving surface), a vacuum laminator (NPC) It was charged to a NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 11. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, when the appearance inspection of the solar cell 11 was performed, the interconnector was buckled near the cell, but the cell was not damaged. There was no peeling of the sealing material and the interconnector. After the temperature cycle (cycle 16), the interconnector was disconnected. There was no damage to the cell, and there was no peeling of the sealing material and the interconnector.

<Comparative Example 5>
A solar cell module having the layer configuration shown in FIG. 9 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. A sheet of sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (ethylene-vinyl acetate, manufactured by CI Kasei Co., Ltd.). Copolymer (EVA) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin Sheet of sealing material (CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFCCE40), length 4 PET sheet (Q1C15, manufactured by Toyobo Co., Ltd., Q1C15) having a thickness of 0 mm, a width of 200 mm, and a thickness of 0.125 mm, a sheet of a sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm ), Ethylene-vinyl acetate copolymer (EVA) UFHCE40) were sequentially laminated, and two 6-inch single crystal silicon cells (manufactured by Shinsung, SH-1990S3) were placed on the 4 mm gap. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on this photoelectric conversion layer, a sheet of a sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA ) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15 manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin sheet (Cai Kasei Co., Ltd., EVAUFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.4 mm thick thermosetting resin A sheet of sealing material (EVAUFHCE40, manufactured by CI Kasei Co., Ltd.) and a A laminate on which a stretched polycarbonate plate (manufactured by Ryojo Techno Co., Ltd., an acrylic film having a thickness of 0.07 mm is heat-sealed on one side of a polycarbonate sheet, the acrylic surface facing the sunlight receiving surface side) is vacuumed. It put into the laminator (the product made by NPC, NLM-270 * 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 12. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, when the appearance inspection of the solar cell 12 was performed, the interconnector was buckled near the cell, but the cell was not damaged. There was no peeling of the sealing material and the interconnector. After the temperature cycle (cycle 32), the interconnector was disconnected. There was no damage to the cell, and there was no peeling of the sealing material and the interconnector.

<Comparative Example 6>
A solar cell module having the layer configuration shown in FIG. 10 was prepared by the following procedure.
Specifically, an acrylic film-clad polycarbonate plate having a length of 400 mm, a width of 200 mm, and a thickness of 1.8 mm as a back surface protective layer (manufactured by Ryojo Techno Co., Ltd., and an acrylic film having a thickness of 0.07 mm was thermally fused to one side of the polycarbonate sheet. , Acrylic surface facing the sunlight non-light-receiving surface side), 400mm long, 200mm wide, made of thermosetting resin with 0.4mm thickness. BR> 髟 侮 ~ Material sheet (Ci Kasei Co., Ltd., Ethylene-vinyl acetate copolymer (EVA) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), 400 mm long, 200 mm wide, 0.4 mm thick thermoplastic Sealant sheet made of resin (Dai Nippon Printing Co., Ltd., modified polyolefin sheet (PO) Z74), length 400 mm, width 200 mm, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.4 mm thick sealing material sheet made of thermosetting resin (Cai Kasei Co., Ltd., Ethylene-vinyl acetate copolymer (EVA) UFHCE40) was sequentially laminated, and two 6-inch single-crystal silicon cells (manufactured by Shinsung, SH-1990S3) were placed on the 4 mm gap. Both single crystal silicon cells were connected by three interconnectors to form a photoelectric conversion layer. Further, on this photoelectric conversion layer, a sheet of a sealing material made of a thermosetting resin having a length of 400 mm, a width of 200 mm, and a thickness of 0.4 mm (produced by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA ) UFHCE40), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, a sealing material sheet made of 0.4 mm thick thermoplastic resin ( Dai Nippon Printing, modified polyolefin sheet (PO) Z74), 400 mm long, 200 mm wide, 0.125 mm thick PET sheet (Toyobo Co., Ltd., Q1C15), 400 mm long, 200 mm wide, 0.4 mm thick As a sheet of a sealing material made of a thermosetting resin (Cai Kasei Co., Ltd., EVAUFHCE40), and a surface protective layer, A laminate on which a cryl film-clad polycarbonate plate (manufactured by Ryojo Techno Co., Ltd., a heat-sealed acrylic film having a thickness of 0.07 mm on one side of a polycarbonate sheet, with the acrylic surface facing the sunlight-receiving surface side) It put into the vacuum laminator (the product made by NPC, NLM-270 * 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 13. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, the solar cell 13 was inspected. As a result, the interconnector was buckled near the cell, but the cell was not damaged. There was no peeling of the sealing material and the interconnector. After the temperature cycle (cycle 32), the interconnector was disconnected. There was no damage to the cell, and there was no peeling of the sealing material and the interconnector.

<Comparative Example 7>
A solar cell module having the layer configuration shown in FIG. 7 was prepared by the following procedure.
Specifically, the back protective layer is 890 mm long, 680 mm wide, and 2 mm thick.
Metal-resin composite plate (manufactured by Mitsubishi Plastics Co., Ltd., ALPOLIC 215PE with a 1.7 mm thick polyethylene resin sheet sandwiched between two 0.15 mm thick metal plates), 890 mm long, horizontal A sheet of sealing material made of a thermosetting resin having a thickness of 680 mm and a thickness of 0.4 mm (manufactured by CI Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFCCE40), length 890 mm, width 680 mm, thickness 0.125 mm PET sheet (manufactured by Toyobo Co., Ltd., Q1C15), sheet of sealing material made of thermosetting resin having a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm (manufactured by CI Chemical Co., Ltd., ethylene-vinyl acetate copolymer) (EVA) UFHCE40) are sequentially laminated, and a 6-inch single crystal silicon cell (manufactured by TSEC, TSS62TNO-) is formed thereon. 186) 5 sheets connected to 3 interconnectors arranged in 4 rows and electrically connected in 20 series with solder coated conductors (width 5 mm, thickness 0.18 mm) and photoelectric conversion layer did. On the photoelectric conversion layer, a sheet of a sealing material made of a thermosetting resin having a length of 890 mm, a width of 680 mm, and a thickness of 0.4 mm (produced by C.I. Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA)) ) UFCCE40), 890 mm long, 680 mm wide, 0.125 mm thick PET sheet (Q1C15, manufactured by Toyobo Co., Ltd.), a sheet of sealing material made of thermosetting resin with 890 mm long, 680 mm wide, 0.4 mm thick (Chi-Kasei Co., Ltd., ethylene-vinyl acetate copolymer (EVA) UFHCE40), as a surface protective layer, an ETFE film (manufactured by Asahi Glass Co., Ltd., 100HK-DCS) having a length of 890 mm, a width of 680 mm, and a thickness of 0.1 mm. The laminated body put on was put into a vacuum laminator (manufactured by NPC, NLM-270 × 400). First, the inside of the laminator was held under reduced pressure for 10 minutes, and then the laminated body 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 14. Then, after cooling after cooling from 130 ° C. to 30 ° C. over 10 minutes, an appearance inspection of the solar cell 14 was performed. As a result, there was no buckling of the interconnector, no damage to the cell, There was no peeling of the interconnector. After the temperature cycle (cycle 32), the interconnector was disconnected. There was no damage to the cell, and there was no peeling of the sealing material and the interconnector.

1 sunlight
2 Surface protective layer
3 Back side protective layer
4 Layer made of thermosetting resin
5 Layer made of thermoplastic resin
6 Photoelectric conversion layer
7 Reinforcing layer

Claims (4)

A solar cell module in which a photoelectric conversion layer including one or more solar cells connected by an electric wire is laminated between a front surface protective layer and a back surface protective layer,
The material of the surface protective layer and / or the back surface protective layer includes a resin having a tensile elastic modulus of 0.5 GPa or more, a linear expansion coefficient of 30 ppm / K or more, and a total light transmittance of 80% or more,
The photoelectric conversion layer is embedded in a sealing material layer made of a thermoplastic resin, and the sealing material layer made of a thermosetting resin is disposed above the surface protective layer and the photoelectric conversion layer. The solar cell module laminated | stacked between the sealing material layer which consists of thermoplastic resins, and the layer which consists of this thermoplastic resin arrange | positioned under this photoelectric conversion layer, and the said back surface protective layer, respectively.   The solar cell module according to claim 1, wherein the thermoplastic resin is a polyolefin resin, and the thermosetting resin is a crosslinkable or non-crosslinkable ethylene-vinyl acetate copolymer (EVA).   The solar cell module according to claim 1 or 2, wherein a reinforcing layer is further laminated between the surface protective layer and the back surface protective layer.   The solar cell module according to claim 3, wherein the reinforcing layer is disposed and laminated between the layer made of the thermoplastic resin and the layer made of the thermosetting resin.