JP2017188577A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module in which occurrence of a PID phenomenon is prevented.SOLUTION: A solar battery module 20 comprises: a translucent substrate (reinforced glass pane) 23 provided at a side of a light-receiving surface to which sunlight is incident; an insulation layer (back sheet) 13 which is provided at a rear face side opposite to the light-receiving surface; and solar battery cells 10 (101, 102 and 103) provided between the translucent substrate 23 and the insulation layer 13 and encapsulated by a first encapsulation layer 21 which is provided at a side of the translucent substrate 23 and a second encapsulation layer 22 which is provided at a side of the insulation layer 13. At least the first encapsulation layer 21 consists of an encapsulation material that does not contain a vinyl acetate based resin, and the solar battery module is fixed so as to be integrated by a frame body 30 which is formed at an outer peripheral edge of these components via an adhesive layer 40 in such a manner that the solar battery module is enclosed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a solar cell module.

  Conventionally, a solar cell module used for photovoltaic power generation has a large number of solar cells disposed between a glass substrate and a weather-resistant film sealed with a sealing material made of an ethylene-vinyl acetate copolymer (EVA). (For example, refer patent document 1).

JP 2014-212318 A

In recent years, a “PID (Potential Induced Degradation) phenomenon” in which the output of a solar cell decreases has been reported. The PID phenomenon is a phenomenon in which when a high voltage flows in a high-temperature and high-humidity environment, current leakage occurs in the module circuit (solar battery cell) and the output drops.
An object of the present invention is to provide a solar cell module in which the PID phenomenon does not occur.

According to the present invention, the translucent substrate provided on the light-receiving surface side on which sunlight enters, the insulating layer provided on the back surface side with respect to the light-receiving surface, and between the translucent substrate and the insulating layer A solar cell sealed by a first sealing layer provided on the translucent substrate side and a second sealing layer provided on the insulating layer side, and at least the first The sealing layer is composed of a sealing material that does not contain a vinyl acetate resin, and a solar cell module is provided.
Here, the first sealing layer preferably includes an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer.
The first sealing layer includes an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer, a first ionomer layer in contact with the solar battery cell, and a vinyl acetate resin. It is preferable to have a vinyl acetate resin layer provided between the ionomer layer and the translucent substrate.
Further, the first sealing layer contains an ionomer of ethylene / α, β-unsaturated carboxylic acid copolymer and is provided between the vinyl acetate resin layer and the translucent substrate. It is preferable to further have a layer.
Moreover, it is preferable that the said 2nd sealing layer contains ethylene vinyl acetate copolymer resin.

  According to the present invention, a solar cell module that does not cause a PID phenomenon is provided.

It is a schematic plan view explaining an example of the solar cell module to which this Embodiment is applied. It is AA sectional drawing of the solar cell module shown in FIG. It is a schematic sectional drawing explaining 2nd Embodiment and 3rd Embodiment of the solar cell module to which this Embodiment is applied. It is a schematic sectional drawing explaining 4th Embodiment of the solar cell module to which this Embodiment is applied. It is a figure explaining an example which attached the solar cell array to the roof of a house.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, this invention is not limited to the following embodiment, It can implement by changing variously within the range of the summary. That is, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments are not intended to limit the scope of the present invention, but are merely illustrative examples, unless otherwise specified. . The drawings used are examples for explaining the present embodiment and do not represent actual sizes. The size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in this specification, “on” such as “on the layer” is not necessarily limited to the case where it is formed in contact with the upper surface, and is formed on the upper side in a separated manner or between layers. It is used in a sense that includes an intervening layer.

<Solar cell module>
FIG. 1 is a schematic plan view for explaining an example of a solar cell module to which the present embodiment is applied. The solar cell module 20 shown in FIG. 1 is composed of a plurality of solar cells 10 and has a rectangular plate-like quadrilateral planar shape as a whole. A tempered glass plate 23 as a translucent substrate is provided on the surface side (light receiving surface). As will be described later, a back sheet 13 (see FIG. 2) as an insulating layer is provided on the back surface side of the solar cell module 20. The outer peripheral edge of the solar cell module 20 is fixed by a frame body 30 such as a metal frame.
The size of the solar cell module 20 is usually in the range of, for example, about 130 cm to 200 cm in length, about 65 cm to 100 cm in width, and about 4 cm to 10 cm in thickness.

FIG. 2 is a cross-sectional view of the solar cell module 20 shown in FIG.
As shown in FIG. 2, the solar cell module 20 includes a tempered glass plate 23 (translucent substrate) provided on the front surface side (light receiving surface) on which sunlight is incident, and a back surface side (roof in FIG. 1) as an insulating layer. A plurality of solar cells 10 (101, 102, 103) sealed with a sealing layer between the tempered glass plate 23 and the back sheet 13; Have.
In this Embodiment, a sealing layer is the 1st sealing layer which consists of a sealing material which does not contain the vinyl acetate type resin provided between the tempered glass board 23 and the photovoltaic cell 10 (101,102,103). 21 and a second sealing layer 22 made of a sealing material containing a vinyl acetate resin provided between the solar battery cell 10 and the back sheet 13.

The end portions of the solar cell module 20 including the back sheet 13, the first sealing layer 21, the second sealing layer 22, the solar battery cell 10 (101, 102, 103), and the tempered glass plate 23 are the constituent elements. It is being fixed so that it may be united by the frame 30 formed so that it might surround the outer peripheral part of this through the adhesive layer 40. Examples of the material used for the adhesive layer 40 include a modified silicone resin. Moreover, as a material which comprises the frame 30, metal materials, such as aluminum, the thermosetting resin which uses dicyclopentadiene as a raw material, etc. are mentioned, for example.
Each layer constituting the solar cell module 20 is laminated and integrated through the first sealing layer 21 and the second sealing layer 22 by using a predetermined vacuum laminator.
Next, each structure which comprises the solar cell module 20 is demonstrated.

(Translucent substrate)
As the translucent substrate, a glass substrate used for the tempered glass plate 23, a transparent resin substrate, or the like is used. In the case of a translucent resin substrate, the resin is formed using, for example, acrylic resin, polycarbonate, polyethylene terephthalate, or the like.
In the present embodiment, as the tempered glass plate 23, a glass plate with a wire mesh in which a wire mesh (wire) is encapsulated in glass can be used. Examples of the shape of the wire mesh (wire) include a cross wire and a rhombus wire.

(Insulating layer)
As a material constituting the back sheet 13 as the insulating layer, for example, a resin foam made of a hard foaming agent made of fluororesin, polyester resin, polyethylene resin, polystyrene resin, vinyl chloride resin, phenol resin, polyurethane, etc., low oligomer -Organic materials such as heat-resistant polyethylene terephthalate (PET) film / polyethylene naphthalate (PEN) film and polycarbonate resin; metal materials such as aluminum foil and SUS; inorganic materials such as silica (SiO ₂ ) vapor deposition film and glass plate can be used .
Further, the backsheet 13 may have a multilayer structure in which a plurality of layers are stacked. In the present embodiment, for example, a laminated structure such as a low density polyethylene resin / polyester resin / protective sheet is employed.

(Solar cell 10)
The structure of the solar battery cell 10 used in the present embodiment is not particularly limited, and examples thereof include an amorphous silicon (a-Si) solar battery. In general, an amorphous silicon (a-Si) type solar cell is composed of a transparent electrode composed of two layers of SiO ₂ and SnO ₂ on a standard blue plate glass substrate, p / i / n (or n / i / p) type amorphous silicon. And a back electrode made of Al (aluminum). As a solar cell structure including a plurality of such a-Si type solar cells, a part of the back electrode is bonded with a silver paste at the contact portion with the copper foil electrode from the back side of the tempered glass plate 23, They are electrically connected to each other.

Further, the number of laminated amorphous silicon layers of the solar battery cell employed in the amorphous silicon (a-Si) type solar battery may be one layer, three layers, four layers or more other than the two-layer structure described above. It is also possible to employ a silicon crystal layer as the solar battery cell. As the silicon crystal layer, either silicon single crystal or silicon polycrystal can be applied.
Furthermore, the solar battery cell can be provided with a compound semiconductor layer. Examples of the composition of the compound semiconductor include GaAs and CdS in the _binary system, and CuInSe _{2 in the} ternary system.

(First sealing layer 21)
In this Embodiment, the 1st sealing layer 21 is comprised from the sealing material which does not contain vinyl acetate type resin.
Here, the PID phenomenon may be caused by, for example, a decrease in volume resistance of the sealing material due to salt damage and a decrease in resistance of the glass surface provided on the light receiving surface side. In the PID phenomenon, Na ions caused by glass provided on the light receiving surface side due to leakage current move to the surface of the solar battery cell, leading to a decrease in output. That is, the cause of the PID phenomenon is, for example, the interaction of tempered glass, cells, back sheets, aluminum frames, etc. on the surface of the solar cell, ionization of sodium present in the glass on the surface of the solar cell, etc. Yes. The PID phenomenon reduces the total output of the entire photovoltaic power generation system.
It is conceivable that the generation mechanism of the PID phenomenon involves acetic acid which is a decomposition product of an ethylene-vinyl acetate copolymer resin (hereinafter sometimes referred to as “EVA resin”) used as a sealing material. In the present embodiment, the PID phenomenon is achieved by providing the first sealing layer 21 made of a sealing material not containing a vinyl acetate resin on the tempered glass plate 23 side of the solar battery cell 10 (101, 102, 103). Can be prevented.

  Examples of the material used for the sealing material not containing vinyl acetate resin include olefin resins such as polyethylene, polypropylene, and cycloolefin copolymer (COC); ionomer resins and silicone resins. In this embodiment, a sealing material containing an ionomer resin is used as a sealing material not containing a vinyl acetate resin.

(Ionomer resin)
The ionomer resin used in the present embodiment is a non-crosslinked thermoplastic resin, which is an ethylene / α, β-unsaturated carboxylic acid such as an ethylene-methacrylic acid copolymer or an ethylene-acrylic acid copolymer. It is a resin having a structure in which an acid group of an acid copolymer is intermolecularly bonded with metal ions of zinc (Zn) or sodium (Na). Specifically, DuPont brand name Surlyn (registered trademark), Mitsui DuPont Polychemical Co., Ltd. trade name Himiran (registered trademark), and the like can be mentioned. These are supplied as a resin film sheet and laminated with other materials.

(Ethylene / α, β-unsaturated carboxylic acid copolymer)
Examples of the “α, β-unsaturated carboxylic acid” constituting the ethylene / α, β-unsaturated carboxylic acid copolymer include acrylic acid, methacrylic acid, ethacrylic acid, itaconic acid, itaconic anhydride, and fumaric acid. And unsaturated carboxylic acids having 4 to 8 carbon atoms such as crotonic acid, maleic acid, and maleic anhydride. As the α, β-unsaturated carboxylic acid, acrylic acid or methacrylic acid is particularly preferable.

  In addition to ethylene and α, β-unsaturated carboxylic acid, α, β-unsaturated carboxylic acid ester may be copolymerized. Specific examples of α, β-unsaturated carboxylic acid esters include, for example, alkyl acrylates such as methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, isooctyl acrylate, methyl methacrylate, methacrylic acid Examples thereof include unsaturated carboxylic acid alkyl esters having 1 to 12 carbon atoms in the alkyl moiety, such as ethyl methacrylate, alkyl methacrylate such as isobutyl methacrylate, and maleic acid alkyl esters such as dimethyl maleate and diethyl maleate.

  Specific examples of the ethylene / α, β-unsaturated carboxylic acid copolymer include, for example, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, etc. as the binary copolymer. Examples of the copolymer include an ethylene / (meth) acrylic acid / alkyl (meth) acrylate copolymer.

  Containing constituent units derived from α, β-unsaturated carboxylic acid in ethylene / α, β-unsaturated carboxylic acid copolymer in ethylene / α, β-unsaturated carboxylic acid copolymer The ratio (mass ratio) is preferably 4% by mass to 20% by mass, and more preferably 7% by mass to 18% by mass.

  Examples of the metal species of the metal or metal compound applied to the acid group bonding of the ethylene / α, β-unsaturated carboxylic acid copolymer include lithium (Li), sodium (Na), potassium (K), and rubidium. (Rb), cesium (Cs), zinc (Zn), magnesium (Mg), manganese (Mn), and the like can be given. Among these, zinc and sodium are preferable because industrialized products can be easily obtained.

  The melt flow rate of the ionomer resin (MFR: measured at 190 ° C. and a load of 2160 g by a method according to JIS K7210-1999) is preferably in the range of 0.2 g / 10 min to 20.0 g / 10 min. 0.5 g / 10 min to 20.0 g / 10 min is more preferable, and 0.7 g / 10 min to 18.0 g / 10 min is more preferable.

(Second sealing layer 22)
In the present embodiment, examples of the sealing material containing the vinyl acetate resin included in the second sealing layer 22 include ethylene-vinyl acetate copolymer resin (EVA). The second sealing layer 22 includes, for example, epoxy resin, acrylic resin, urethane resin, olefin resin, polyester resin, silicone resin, polystyrene resin, polycarbonate resin, rubber resin, etc. in addition to EVA. It may be.

  In the present embodiment, the ethylene-vinyl acetate copolymer resin (EVA) contained in the second sealing layer 22 is usually one having a vinyl acetate content of 10 mass parts to 50 mass parts. it can. In particular, in consideration of the water vapor transmission rate of EVA itself, those having a vinyl acetate content of 35% or less are preferable.

  In the present embodiment, a crosslinking agent is added to EVA in advance, and the second sealing layer 22 made of EVA can be cured by a crosslinking reaction using the crosslinking agent. Examples of the crosslinking agent include organic peroxides. Any organic peroxide that can generate radicals at 110 ° C. or higher can be used. Among these, in consideration of stability at the time of blending, those having a decomposition temperature with a half-life of 10 hours are preferably 70 ° C. or higher.

  Examples of such organic peroxides include 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3, Di-t-butyl peroxide; dicumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide; α, α'-bis (t-butylperoxy) Isopropyl) benzene; n-butyl-4,4-bis (t-butylperoxy) butane; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; Examples include 1,1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane; t-butylperoxybenzate; benzoyl peroxide. The compounding quantity of these organic peroxides is 5 mass% or less normally with respect to EVA.

It is also possible to add a crosslinking aid in addition to the above crosslinking agent. Examples of the crosslinking aid include trifunctional crosslinking aids such as triallyl isocyanurate and triallyl isocyanate. The amount of these crosslinking aids used is usually 10% by mass or less based on EVA.
In addition, hydroquinone, hydroquinone monomethyl ether, P-benzoquinone, methyl hydroquinone, etc. can be added at 5 mass% or less with respect to EVA for the purpose of improving the stability of the second sealing layer 22 made of EVA. Moreover, an ultraviolet absorber, an antiaging agent, a discoloration preventing agent, etc. can be added. Among these, as the ultraviolet absorber, for example, 2-hydroxy-4-octoxybenzophenone; benzophenone series such as 2-hydroxy-4-methoxy-5-sulfobenzophenone; 2- (2′-hydroxy-5- Benzotriazoles such as methylphenyl) benzotriazole, phenyl salsylates; hindered amines such as pt-butylphenyl salicylate. Examples of the anti-aging agent include amines, phenols, bisphenyls, hindered amines, and the like. Specific examples include di-t-butyl-p cresol, bis (2-2-6-6-tetramethyl-4-biperazyl) sebacate and the like.

  In addition, as a method of hardening EVA which comprises the 2nd sealing layer 22, for example, a photosensitizer is added to EVA beforehand and it decomposes | disassembles by irradiating light to this and gives EVA composition a crosslinked structure. Can do. Examples of photosensitizers that generate radicals upon light irradiation include benzoin, benzoin methyl ether, benzoin isoethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzoyl, hexachlorocyclopentadiene, paranitrodiphenyl, paranitroaniline, 2 -4-6-trinitroaniline, 1-2-benzanthraquinone and the like. The usage-amount of these photosensitizers is 10 mass% or less normally with respect to EVA.

FIG. 3 is a schematic cross-sectional view illustrating a second embodiment and a third embodiment of a solar cell module to which the present embodiment is applied.
FIG. 3A is a schematic cross-sectional view illustrating the second embodiment. The same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Note that the adhesive layer 40 and the frame body 30 (see FIG. 2) are omitted.
As shown in FIG. 3A, the first sealing layer 21 of the solar cell module 201 includes an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer, and the solar cell 10 (101, 102, 103) and a vinyl acetate resin layer 212 including a vinyl acetate resin and provided between the first ionomer layer 211 and the tempered glass plate 23.

The thickness of the first ionomer layer 211 is in the range of 0.05 mm to 0.5 mm. Examples of the ionomer of the ethylene / α, β-unsaturated carboxylic acid copolymer contained in the first ionomer layer 211 include those described above.
The thickness of the vinyl acetate resin layer 212 is in the range of 0.1 mm to 0.5 mm. Examples of the vinyl acetate resin contained in the vinyl acetate resin layer 212 include EVA similar to the second sealing layer 22 in the present embodiment.

  The first sealing layer 21 includes a first ionomer-containing layer 211 that does not include a vinyl acetate-based resin that contacts the light-receiving surface side of the solar battery cell 10 (101, 102, 103), and a vinyl acetate-based resin layer 212 that includes EVA. By forming the two-layer structure, the amount of expensive sealing material used is reduced as compared with EVA contained in the first ionomer layer 211, and as a result, the manufacturing conditions when using EVA as the sealing material. Thus, the solar cell module 201 can be prepared.

FIG. 3B is a schematic cross-sectional view illustrating the third embodiment. The same components as those in FIG. 2 are denoted by the same reference numerals and the description thereof is omitted. Note that the adhesive layer 40 and the frame body 30 (see FIG. 2) are omitted.
As shown in FIG. 3B, the first sealing layer 21 of the solar cell module 202 includes an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer, and the solar cell 10 (101, 102, 103) a first ionomer layer 211 in contact with the resin, a vinyl acetate resin layer 212 containing a vinyl acetate resin, and a vinyl acetate resin layer containing an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer. A second ionomer layer 213 provided between 212 and the tempered glass plate 23 is further provided.

The first ionomer layer 211 has a thickness in the range of 0.05 mm to 0.2 mm. Examples of the ionomer of the ethylene / α, β-unsaturated carboxylic acid copolymer contained in the first ionomer layer 211 include those described above.
The thickness of the vinyl acetate resin layer 212 is in the range of 0.1 mm to 0.5 mm. Examples of the vinyl acetate resin contained in the vinyl acetate resin layer 212 include EVA similar to the second sealing layer 22 in the present embodiment.
The thickness of the second ionomer layer 213 is in the range of 0.05 mm to 0.2 mm. Examples of the ionomer of the ethylene / α, β-unsaturated carboxylic acid copolymer contained in the second ionomer layer 213 include those described above.

  The first sealing layer 21 includes a first ionomer-containing layer 211 that does not include a vinyl acetate-based resin that contacts the light-receiving surface side of the solar battery cell 10 (101, 102, 103), and a vinyl acetate-based resin layer 212 that includes EVA. In addition to the above, the solar cell 10 (101, 102) due to sodium ions or the like that may be generated from the tempered glass plate 23 by forming a three-layer structure with the second ionomer layer 213 that does not contain a vinyl acetate resin. , 103) can be reduced.

  Thus, the solar cell modules 20, 201, 202 to which the present embodiment is applied are sealed without containing vinyl acetate resin on the tempered glass plate 23 side of the solar cells 10 (101, 102, 103). By providing the first sealing layer 21 made of a material, the occurrence of the PID phenomenon can be prevented.

FIG. 4 is a schematic cross-sectional view for explaining a fourth embodiment of the solar cell module to which the present embodiment is applied. The same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 4, the solar cell module 203 to which the present embodiment is applied has a first sealing in which the solar cells 10 (101, 102, 103) are made of a sealing material that does not contain a vinyl acetate resin. Similar to the first sealing layer 21, the layer 21 has a structure sandwiched between the second sealing layer 24 made of a sealing material not containing a vinyl acetate resin.
In the present embodiment, a sealing material including an ionomer resin is used as a sealing material that does not include the vinyl acetate resin that forms the first sealing layer 21 and the second sealing layer 24.
Thus, the solar cell module 203 to which this embodiment is applied includes the solar cell 10 (101, 102, 103) and the first sealing layer 21 made of a sealing material that does not contain a vinyl acetate resin. By adopting the structure inserted by the second sealing layer 24, it is possible to prevent the occurrence of the PID phenomenon.

(Method for manufacturing solar cell module)
As a manufacturing method of the solar cell module 20 to which this embodiment is applied, for example, a crosslinkable resin for forming the second sealing layer 22 on the tempered glass plate 23 (in this embodiment, EVA is used). A solar cell 10 sandwiched between two sheets including an ionomer for forming the first sealing layer 21 and the back sheet 13 and the like, and these are heated in a reduced pressure state and subjected to pressure bonding An integral molding process (lamination) for sealing may be mentioned. A vacuum laminator device used for manufacturing an ordinary solar cell module is used for integral molding (lamination).
The conditions of the integral molding process (lamination) are not particularly limited, but in the present embodiment, the molding temperature is usually in the range of 150 ° C. to 200 ° C., and the molding time is usually in the range of 15 minutes to 120 minutes. Is appropriately selected.

  In the present embodiment, it is preferable to perform pre-heat treatment at a predetermined temperature in advance before the respective layers are pressure-sealed in an integral molding process (lamination) using a vacuum laminator apparatus. The preheat treatment conditions are appropriately selected according to the conditions of integral molding (lamination) and are not particularly limited, but are usually in the range of 3 to 8 minutes at a temperature of about 160 ° C.

(Solar cell array)
FIG. 5 is a diagram illustrating an example in which a solar cell array is attached to the roof of a building. As shown in FIG. 5, the roof 1 to which the solar cell array 100 composed of a plurality of solar cell modules 20 is attached is constructed on the top of the building 2.
The power generation system including the solar cell modules 20 constituting the solar cell array 100 includes a connection box 3 that combines the DC voltages generated by the solar cell modules 20 and a DC generated by the solar cell modules 20 as a distribution facility. A power conditioner (DC AC converter) 4 for converting the voltage into an AC voltage, and a distribution board 5 for supplying the AC voltage converted by the power conditioner 4 to the home appliances E in the building 2 Yes. The power supplied to the distribution board 5 through the power conditioner 4 is also supplied to the power supply equipment 7 outside the building 2. Here, the power supply facility 7 is a facility for supplying electric power generated at the power plant. Further, the power supplied from the power supply facility 7 is supplied to the power distribution facility including the distribution board 5 and further supplied to the home appliances E and the like in the building 2. The power supplied to the power supply facility 7 outside the building 2 and the power supplied from the power supply facility 7 are displayed by a power sale meter 6a and a power purchase meter 6b, respectively.

  The connection box 3 houses connection portions such as connectors for connecting the solar cell module 20 and the power distribution equipment (power conditioner 4, distribution board 5), and the current from the solar cell module 20 is connected to the connection box 3. It flows to the inverter 4 via Further, the power conditioner 4 may be equipped with a so-called inverter function that modulates the power supplied from the solar cell module 20 to the power supply equipment 7 outside the building 2.

  The solar cell module 20 to which this embodiment is applied is usually attached to a roof plate having a certain inclination (for example, an angle of about 15 degrees to an angle of about 20 degrees) using a predetermined mounting bracket. The roof plate is usually fixed to a slate with a certain slope using a slate and sheet metal bracket fixed to a vertical beam. In addition, the slate / sheet metal fitting is fixed by a predetermined wood screw that reaches a rafter and a path plate installed on the lower side of the slate.

  Below, based on an Example, this invention is demonstrated further in detail. In addition, this invention is not limited to an Example. Further, all parts and percentages in the examples are based on weight unless otherwise specified.

(Solar cell module 203)
As shown in FIG. 4, a solar cell 10 (101, 102, 103) made of a predetermined amorphous silicon (a-Si) type solar cell is replaced with an ionomer resin (trade name High Milan (registered by Mitsui DuPont Polychemical Co., Ltd.)) Trademark)) between the first sealing layer 21 and the second sealing layer 24 (both layers are 0.40 mm in thickness), and further, these are tempered glass plate 23 and back sheet A laminate sandwiched between 13 was prepared. Next, this laminate is placed in a vacuum laminator (NPC Co., Ltd.) chamber, preheated at 180 ° C. for 6 minutes under reduced pressure, and then at 180 ° C. for 15 minutes. Lamination was performed, and the solar battery cell 10 was pressure sealed with the first sealing layer 21 and the second sealing layer 24, and the solar battery module 203 in which these were integrated was molded. Thereafter, the end portion was fitted into the frame body 30 and sealed with the adhesive layer 40. In addition, the size of the solar cell module 203 is 1 m wide and 1.4 m long.

(Evaluation method)
About the solar cell module 203 prepared by the operation described above, a PID test and a bus test were performed by the following operation.
(1) PID test (power generation deterioration test)
-1000 V was applied to the prepared solar cell module 203 for 96 hours under the condition of 85 ° C. × 85% RH. Thereafter, the maximum output Pm was measured, and the ratio to the initial value was defined as the degree of deterioration. The larger the value, the greater the power generation degradation due to the PID phenomenon (unit:%).
(2) Bath test (waterproof performance test)
The prepared solar cell module 203 was immersed in warm water at 90 ° C. for 48 hours, and then whether or not clouding occurred in the horizontal bus bar portion of the solar cell module 203 was observed. When cloudiness is not observed in the horizontal bus bar portion, the water resistance by the first sealing layer 21 and the second sealing layer 24 is good.

As a result of the evaluation test, in the PID test (power generation deterioration test), the maximum output Pm measured after applying −1000 V to the solar cell module 203 under the condition of 85 ° C. × 85% RH for 96 hours is the power generation relative to the initial value. No deterioration was observed, and it was confirmed that power generation deterioration due to the PID phenomenon was prevented.
In the bus test (waterproof performance test), since the gloss of the horizontal bus bar portion of the solar cell module 203 was maintained and no clouding was observed, it was confirmed that the waterproof property was good.

DESCRIPTION OF SYMBOLS 1 ... Roof, 2 ... Building, 3 ... Connection box, 4 ... Power conditioner, 5 ... Distribution board, 6a ... Electric power selling meter, 6b ... Electric power purchase meter, 7 ... Power supply equipment, 10, 101, 102, 103 ... Solar cell, 13 ... back sheet, 20, 201, 202, 203 ... solar cell module, 21 ... first sealing layer, 211 ... first ionomer layer, 212 ... vinyl acetate resin layer, 213 ... second Ionomer layer, 22, 24 ... second sealing layer, 23 ... tempered glass plate, 30 ... frame, 40 ... adhesive layer

Claims (5)

A translucent substrate provided on the light receiving surface side on which sunlight is incident;
An insulating layer provided on the back side of the light receiving surface;
The sun provided between the translucent substrate and the insulating layer and sealed by a first sealing layer provided on the translucent substrate side and a second sealing layer provided on the insulating layer side A battery cell,
At least the first sealing layer is made of a sealing material that does not contain a vinyl acetate resin, and is a solar cell module.   The solar cell module according to claim 1, wherein the first sealing layer contains an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer.   The first sealing layer includes an ionomer of an ethylene / α, β-unsaturated carboxylic acid copolymer, a first ionomer layer in contact with the solar battery cell, and a vinyl acetate resin. 3. The solar cell module according to claim 1, further comprising a vinyl acetate resin layer provided between the ionomer layer and the translucent substrate.   The first sealing layer includes a second ionomer layer containing an ionomer of ethylene / α, β-unsaturated carboxylic acid copolymer and provided between the vinyl acetate resin layer and the translucent substrate. The solar cell module according to claim 3, further comprising:   The solar cell module according to any one of claims 1 to 4, wherein the second sealing layer contains an ethylene vinyl acetate copolymer resin.

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