JP2014143321A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module in which PID phenomenon does not occur even under a high temperature high humidity environment.SOLUTION: A solar cell module comprises: a translucent substrate; an insulating layer; and a plurality of solar cells sealed by a sealing layer between the translucent substrate and insulating layer. In the plan view of a solar cell module having a plane shape of quadrilateral, the degree of gelation (A) at a part of the sealing layer formed in a predetermined region including the center of the quadrilateral is at least 85%, and the ratio (B/A) of the degree of gelation (B) at a part formed, respectively, in predetermined regions including four corners of the quadrilateral and the degree of gelation (A) is at least 1, respectively.

Description

  The present invention relates to a solar cell module.

  In recent years, solar power generation using solar energy has been rapidly developed. Conventionally, a solar cell module used for photovoltaic power generation includes a translucent substrate such as a glass substrate disposed on the light receiving side, an insulating layer such as a weather resistant film disposed on the back surface, and a translucent substrate. A large number of solar cells disposed between insulating layers, and a sealing layer (sealing material) disposed between the translucent substrate and the insulating layer and sealing the large number of solar cells. (See Patent Document 1).

JP 2011-159726 A

By the way, recently, a “PID phenomenon” in which the output of a solar cell decreases in Europe has been reported. The PID (Potential Induced Degradation) 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 cell) and the output drops. Possible causes of the PID phenomenon include, for example, 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, and the like. The PID phenomenon may reduce the total output of the entire photovoltaic power generation system.
An object of the present invention is to provide a solar cell module in which a PID phenomenon does not occur even in a hot and humid environment.

  According to the present invention, there is provided a solar cell module including a translucent substrate, an insulating layer, and a plurality of solar cells sealed by a sealing layer between the translucent substrate and the insulating layer. When the planar shape of the solar cell module having a quadrangular shape is viewed in plan, the gelation degree (A) of a portion formed in a predetermined region including the center of the quadrilateral in the sealing layer is at least 85. %, And the ratio (B / A) of the degree of gelation (B) and the degree of gelation (A) of the part formed in each of the predetermined regions including the four corners of the quadrilateral, respectively A solar cell module is provided that is at least one.

Here, the sealing layer is preferably formed by curing a crosslinkable resin by a crosslinking reaction using a predetermined crosslinking agent.
The sealing layer includes the crosslinkable resin in a portion formed in a predetermined region including the center of the quadrilateral and a portion formed in a predetermined region including four corners of the quadrilateral. It is preferable that the cross-linking agent is not substantially contained in such an amount that the cross-linking reaction occurs.
In the sealing layer, the crosslinkable resin is preferably an ethylene-vinyl acetate copolymer resin.
The area of the region including the center of the quadrilateral is 10 cm ² , and the predetermined region including the four corners of the quadrilateral includes an area including a point having a distance of 6 cm from the end of the translucent substrate. Is preferably 10 cm ² .

  ADVANTAGE OF THE INVENTION According to this invention, the solar cell module which does not produce a PID phenomenon also in a hot and humid environment is provided.

It is a figure explaining an example which attached the solar cell array to the roof of a house. 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 plan view explaining the gelation degree of the sealing layer of the solar cell module to which this Embodiment is applied.

  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.

FIG. 1 is a diagram illustrating an example in which a solar cell array is attached to the roof of a building. As shown in FIG. 1, a roof 1 to which a solar cell array 100 composed of a plurality of solar cell modules 20 is attached is constructed on the top of a 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 the power sale meter 6a and the 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.

<Solar cell module>
FIG. 2 is a schematic plan view illustrating an example of a solar cell module to which the present embodiment is applied. The solar cell module 20 shown in FIG. 2 is composed of a plurality of solar cells 10, and has a rectangular plate-like planar shape as a whole. A translucent substrate such as a tempered glass plate 23 (see FIG. 3) is provided on the front side (light receiving surface). As will be described later, an insulating layer such as a back sheet is provided on the back side of the solar cell module 20 (the roof side in FIG. 1). 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.

3 is a cross-sectional view of the solar cell module 20 shown in FIG.
As shown in FIG. 3, the solar cell module 20 includes a tempered glass plate 23 provided on the front surface side (light receiving surface) as a translucent substrate and a back provided on the back side (roof side in FIG. 1) as an insulating layer. Between the sheet | seat 13, the tempered glass board 23, and the back sheet | seat 13, it has the several photovoltaic cell 10 sealed with the sealing layer 21. As shown in FIG. As will be described later, the back sheet 13 has a three-layer structure.

The end portions of the solar battery module 20 including the back sheet 13, the sealing layer 21, the solar battery cell 10, and the tempered glass plate 23 are formed so as to surround the outer peripheral edge portion of these components via the adhesive layer 40. The frame 30 is fixed so as to be integrated. Moreover, each layer which comprises the solar cell module 20 is laminated | stacked and integrated via the sealing layer 21 by using a predetermined | prescribed vacuum laminator.
Next, each layer constituting the solar cell module 20 will be described.

(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.

(Frame 30)
Examples of the material constituting the frame 30 include a metal material such as aluminum, a thermosetting resin using dicyclopentadiene as a raw material, and the like.

(Adhesive layer 40)
Examples of the material used for the adhesive layer 40 that fixes the end portion of the solar cell module 20 and the frame body 30 include a modified silicone resin.

(Sealing layer 21)
Examples of the material constituting the sealing layer 21 include ethylene-vinyl acetate copolymer resin (EVA), epoxy resin, acrylic resin, urethane resin, olefin resin, polyester resin, silicone resin, polystyrene resin, polycarbonate resin, and rubber. Based resins and the like. Among these, ethylene-vinyl acetate copolymer resin (EVA) is preferable.

  In the present embodiment, an ethylene-vinyl acetate copolymer resin (hereinafter referred to as EVA) is used as the material of the sealing layer 21 that seals the solar battery cell 10. EVA having a vinyl acetate content of 10% by mass to 50% by mass can be used. 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 sealing layer 21 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 an organic peroxide include 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3, Di-tbutyl peroxide; dicumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide; α, α′-bis (t-butylperoxyisopropyl) ) Benzene; n-butyl-4,4-bis (t-butylperoxy) butane; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; 1-bis (t-butylperoxy) 3,3,5-trimethylcyclohexane; t-butylperoxybenzate; benzoyl peroxide and the like. 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 sealing layer 21 made of EVA. Moreover, an ultraviolet absorber, an antiaging agent, a discoloration preventing agent, etc. can be added. Examples of the ultraviolet absorber include 2-hydroxy-4-octoxybenzophenone; benzophenone series such as 2-hydroxy-4-methoxy-5-sulfobenzophenone; 2- (2′-hydroxy-5-methylphenyl) benzo Examples thereof include benzotriazoles such as triazole, 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 sealing layer 21, for example, a photosensitizer can be added to EVA beforehand, and it can decompose by irradiating light to this and can give a crosslinked structure to an EVA composition. . 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.

In the solar cell module 20 to which the present embodiment is applied, the sealing layer 21 that seals the solar cells 10 is cured with a crosslinking agent previously added to EVA, and is subjected to a predetermined gel measurement method as described above. It is shaped so that the measured degree of gelation is a specific numerical value or more.
Next, the gelation degree of the sealing layer 21 will be described.

FIG. 4 is a schematic plan view illustrating the degree of gelation of the sealing layer 21 of the solar cell module 20 to which the present embodiment is applied.
As will be described later, when the solar cell module 20 is integrally formed using a predetermined vacuum laminator, the crosslinking reaction in the sealing layer 21 proceeds by a predetermined heat treatment, the sealing layer 21 is cured, and each layer Is firmly bonded. In the solar cell module 20 to which this embodiment is applied, the sealing layer 21 is uniformly cured, and the degree of adhesion of each layer in the central portion and the peripheral portion of the solar cell module 20 is substantially equal. Molded.

That is, in the solar cell module 20 to which the present embodiment is applied, as shown in FIG. 4, when the solar cell module 20 whose planar shape is a quadrilateral is viewed in plan, the quadrangular shape in the sealing layer 21. The gelation degree (A) of the portion formed in the predetermined region (region a) including the center and the predetermined region (region b ¹ to region b ⁴ ) including the four corners of the quadrilateral are formed respectively. The ratio (B / A) between the gelation degree (B) and the gelation degree (A) is at least 1 respectively. Moreover, it is preferable that ratio (B / A) of a gelation degree (B) and a gelation degree (A) is 1.01 or more.

Furthermore, in this Embodiment, when using ethylene-vinyl acetate copolymer resin (it is called EVA) as a material of the sealing layer 21 which seals the photovoltaic cell 10, predetermined area | region including the center of the solar cell module 20 is used. The gelation degree (A) in (region a) is shaped to be 85% or more. Further, the gelation degree (A) in the region a is preferably 91% or more, and more preferably 93% or more. If the gelation degree (A) in the region a is excessively small, there is a tendency for adhesion variation to occur in the entire solar cell module 20.
However, when the gelation degree (A) and the gelation degree (B) of the sealing layer 21 are excessively large, the flexibility of the sealing layer 21 tends to be lowered and easily deteriorated. From such a viewpoint, the gelation degree (A) and the gelation degree (B) of the sealing layer 21 are usually 95% or less.

Here, the gelation degree of the sealing layer 21 is determined by performing gel measurement in the corresponding region (region a, region b ¹ to region b ⁴ ) of the sealing layer 21 described above. The gel measurement method is performed according to the following procedure. That is, about 1 g (sample) of EVA cured by the crosslinking reaction is dissolved in 100 ml of xylene under the condition of 110 ° C. × 12 hours. Next, the xylene insoluble matter of the (EVA / xylene) solution is filtered through a 30 mesh wire mesh. Subsequently, a 30 mesh wire net containing xylene insolubles is dried under conditions of 110 ° C. × 8 hours. Then, the gel fraction (%) is calculated by the following formula, and this is defined as the degree of gelation (unit:%).
Gel fraction (%) = [(weight after drying insoluble in xylene) / (weight of sample)] × 100

Here, the ratio (B / A) of the gelation degree (B) and the gelation degree (A) in the sealing layer 21 of the solar cell module 20 is the sealing at the central portion and the peripheral portion of the solar cell module 20. It has technical significance as an evaluation index indicating the degree of adhesion of each layer through the layer 21.
That is, when the ratio (B / A) of the degree of gelation (B) and the degree of gelation (A) is 1 or more, the peripheral portion is compared with the degree of adhesion in the central portion of the solar cell module 20. It shows that the degree of adhesion is equivalent or higher. This means that the sealing state of the solar cell 10 by the sealing layer 21 is good, and the tempered glass plate 23 and the back sheet 13 and the solar cell 10 have no variation in the entire solar cell module 20, It shows that it is bonded substantially uniformly.

  Thus, in the whole solar cell module 20, each layer is adhered substantially uniformly, and in particular, the degree of adhesion at the peripheral portion is stronger than the central portion, so that the waterproof property of the solar cell module 20 is achieved. Will improve dramatically. As a result, it is considered that the penetration of moisture into the solar cell module 20 is hindered even in a hot and humid environment, and a decrease in output due to the PID phenomenon is suppressed.

In the present embodiment, each region of the solar cell module 20 for evaluating the gelation degree of the sealing layer 21 is a quadrilateral when the solar cell module 20 is viewed in plan, as shown in FIG. This is a portion where the area of the predetermined region (region a) including the center is 10 cm ² . The area predetermined region including four corners of the quadrilateral (regions b ^{1 ~} region b ^4), the distance from the edge of the tempered glass plate 23 is a light transmissive substrate including a point of 6cm Is a portion of 10 cm ² .

In the present embodiment, as described above, the gelation degree is preferable in the corresponding region (region a, region b ¹ to region b ⁴ ) of the solar cell module 20 for evaluating the gelation degree of the sealing layer 21. Therefore, it is considered that almost all of the crosslinking agent used for the crosslinking reaction of the ethylene-vinyl acetate copolymer resin (EVA) constituting the sealing layer 21 is consumed. That is, it is in a state where it is not substantially contained as an amount in which EVA crosslinking reaction occurs. This is because, for example, in the thermal measurement using DSC (Differential Scanning Calorimetry), the exothermic peak caused by the crosslinking agent such as an organic peroxide in the measurement temperature range of 140 ° C. to 200 ° C., for example. Is not observed.

(Method for manufacturing solar cell module)
As a manufacturing method of the solar cell module 20 to which the present embodiment is applied, for example, a crosslinkable resin for forming the sealing layer 21 on the tempered glass plate 23 (in this embodiment, EVA is used. The solar battery cell 10 and the back sheet 13 sandwiched between two sheets are laminated, heated in a reduced pressure state, and pressure-bonded and sealed (lamination). 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 preheating condition is appropriately selected according to the conditions of integral molding (lamination), and is not particularly limited, but is usually in the range of 3 to 8 minutes at a temperature of about 180 ° C.

  The solar cell module 20 to which this embodiment is applied is usually attached to a roof plate having a certain inclination (for example, about 15 ° to 20 °) 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. In the examples and comparative examples, all parts and percentages are based on weight unless otherwise specified.

(Example 1, Comparative Example 1)
A solar battery cell 10 composed of a predetermined amorphous silicon (a-Si) solar battery is sandwiched between two EVA resin films (thickness: 0.40 mm) containing a crosslinking agent, and these are further reinforced glass plate 23. And the laminated body pinched | interposed into the back sheet | seat 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 sealing layer 21, and the solar battery module 20 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. The size of the solar cell module 20 is 1 m wide and 1.4 m long.

The gelation degree (gelation degree (B), gelation degree (A)) and gelation degree (B) of each region (region a, region b ¹ to region b ⁴ ) of the sealing layer 21 described in FIG. ) And the gelation degree (A) (B / A) are shown in Table 1.

  Next, as Comparative Example 1, a laminate composed of the solar battery cell 10 used in Example 1, two EVA resin films containing a crosslinking agent, a tempered glass plate 23, and a back sheet 13 was prepared. Next, this laminate is placed in a vacuum laminator (NPC Co., Ltd.) chamber, preheated at 155 ° C. for 5 minutes under reduced pressure, and then laminated at 155 ° C. for 10 minutes. The solar cell 10 was processed and pressure-sealed with the sealing layer 21, and a solar cell module (Comparative Example 1) 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.

(Evaluation method)
The bus test and the PID test were performed on the prepared solar cell module 20 by the operation described above by the following operations. The results are shown in Table 1.
(1) Bus test (waterproof performance test)
After the prepared solar cell module 20 was immersed in warm water at 90 ° C. for 48 hours, it was observed whether or not clouding occurred in the horizontal bus bar portion of the solar cell module 20. When cloudiness is not observed in the horizontal bus bar portion, the waterproof property by the sealing layer 21 or the like is good.
(2) PID test (power generation deterioration test)
-1000V was applied to the prepared solar cell module 20 for 96 hours on condition of 85 degreeC x 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:%).

From the results shown in Table 1, the degree of gelation (A) of the portion formed in the region a including the center of the quadrilateral is 85% or more, and the region b ¹ to four corners of the quadrilateral is included. the ratio of the degree of gelation of the respective portions formed in a region b ⁴ (B) and degree of gelation (a) (B / a) is, the solar cell module 20 that is shaped to respectively at least (example 1) shows that the result of the bus test is good and the power generation deterioration by the PID test is 0%, so that the solar cell module does not cause the PID phenomenon even in a high temperature and humidity environment.
On the other hand, when the gelation degree (A) of the solar cell module is less than 85% (Comparative Example 1), the ratio (B / A) between the gelation degree (B) and the gelation degree (A) is It can be seen that even when the number is 1 or more, the horizontal bus bar portion is whitened in the bus test, and power generation deterioration is caused by the PID test.

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 ... Solar cell, 13 ... Back sheet, 20 ... solar cell module, 21 ... sealing layer, 23 ... tempered glass plate, 30 ... frame, 40 ... adhesive layer

Claims (5)

A solar cell module having a translucent substrate, an insulating layer, and a plurality of solar cells sealed by a sealing layer between the translucent substrate and the insulating layer,
When the solar cell module whose planar shape is a quadrilateral is viewed in plan, a gelation degree (A) of a portion formed in a predetermined region including the center of the quadrilateral in the sealing layer is at least 85%. And the ratio (B / A) between the degree of gelation (B) and the degree of gelation (A) formed in each of the predetermined regions including the four corners of the quadrilateral is at least 1 is a solar cell module.   The solar cell module according to claim 1, wherein the sealing layer is formed by curing a crosslinkable resin by a crosslinking reaction using a predetermined crosslinking agent.   The sealing layer includes the crosslinkable resin in a portion formed in a predetermined region including the center of the quadrilateral and a portion formed in a predetermined region including four corners of the quadrilateral. The solar cell module according to claim 2, which is substantially free of an amount of the cross-linking agent that causes a cross-linking reaction.   The solar cell module according to claim 2 or 3, wherein in the sealing layer, the crosslinkable resin is an ethylene-vinyl acetate copolymer resin. The area of the region including the center of the quadrilateral is 10 cm ² , and the predetermined region including the four corners of the quadrilateral includes an area including a point having a distance of 6 cm from the end of the translucent substrate. 5 is 10 cm < ² >, The solar cell module of any one of Claims 1 thru | or 4 characterized by the above-mentioned.

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