JP2000164912A - Solar battery module and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the heat resisting property of a solar battery module by sealing a solar battery between a surface member and a backside member, using a sealing material of a specified thickness. SOLUTION: A solar cell 3 is made of a crystal semiconductor material such as amorphous semiconductor material, which is typified by amorphous silicon, crystalline silicon, and polycrystalline silicon or of a compound semiconductor material such as GaAs, CbTe, and CuInSe2. The solar cell 3 is buried in sealing material 5 and is sealed between a surface member 1 and a backside member 2. For the material of the sealing material 5, PVB, PVC, polyurethane, silicone, etc., as well as EVA could be used. The backside member 2, a first sealing sheet, the solar battery 3, a second sealing sheet, and the surface member 1 are stacked and then are applied with heat and pressure. The sum of the thickness of the first sheet and the second sheet is at least 1.5 mm, preferably 2.0 mm or above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module in which a solar cell is sealed between a front surface member and a back surface member with a sealing material, and more particularly to a solar cell module usable as a building material and a solar cell module therefor. Related to a manufacturing method.

[0002]

2. Description of the Related Art In recent years, solar cells have been used for roofs of houses, buildings, and the like.
2. Description of the Related Art A photovoltaic power generation system that is installed on a veranda or a rooftop, and supplies electric power generated by a solar cell to electric equipment in a home or a building has become widespread. In such a photovoltaic power generation system, a solar cell is usually installed outdoors, and thus it is necessary to enhance its weather resistance. For this reason, conventionally, the solar cell is sealed between a front surface member such as tempered glass and a back surface member such as a metal foil with a sealing material made of a resin material,
It is used as a solar cell module with improved weather resistance. When such a solar cell module is installed on a roof of a house, for example, a metal base is generally installed on a roof tile, and the solar cell module is mounted on the base.

In recent years, the use of solar cell modules as building materials for roofs has been studied. If it can be used as a building material in this way, the solar cell module can be mounted directly on the roof slab, reducing the cost without the need for conventional roof tiles and reducing the weight of the roof tiles As a result, the strength of the roof itself can be improved.

On the other hand, in order to use the solar cell module as a building material in this way, when the module is heated, for example, when a spark of fire falls from the surroundings onto the module surface, a sealing material made of a resin material is used. Sufficient heat resistance that does not leak to the outside is required. For this reason, conventionally, it has been studied to reduce the amount of a sealing material made of a resin material as much as possible in order to increase the heat resistance of the solar cell module.

[0005]

However, according to the conventional method for reducing the amount of the sealing material, the heat resistance is still insufficient. For this reason, when installing a solar cell module on a roof, install the solar cell module on a roof tile or on a metal plate such as an iron plate laid on a roof base plate as an alternative to the roof tile. Was.

An object of the present invention is to solve the above conventional problems and to provide a solar cell module having sufficient heat resistance and a method for manufacturing the same.

[0007]

In order to solve the above-mentioned conventional problems and to provide a solar cell module having a sufficient heat resistance, the solar cell module of the present invention comprises:
A solar cell module sealed between a front surface member and a back surface member with a sealing material, wherein the thickness of the sealing material is 1.5 mm or more.

Preferably, the thickness of the sealing material is 1.8 mm
It is good to be above, More preferably, it is good to be 2.0 mm or more.

In the solar cell module according to the present invention, the encapsulant seals the solar cell by burying the solar cell therein, or one main surface of the solar cell is The sealing member is provided in direct contact with either one of the front member and the back member, and the sealing material covers the entire surface of the solar cell except for the one main surface to seal the solar cell. is there.

Further, the method for manufacturing a solar cell module according to the present invention is characterized in that the back member, the first sealing material sheet, the solar cell, the second sealing material sheet, and the surface member are heated in a laminated state. And a pressure applying step, wherein the sum of the thicknesses of the first sealing material sheet and the second sealing material sheet is 1.5 mm or more.

Preferably, the sum of the thicknesses of the first sealing material sheet and the second sealing material sheet is 1.8 mm or more, and more preferably, the first sealing material sheet and the second sealing material sheet have a thickness of 1.8 mm or more. The sum of the thicknesses of the sealing material sheets of No. 2 is preferably 2.0 mm or more.

Further, in the method of manufacturing a solar cell module according to the present invention, the other member is laminated via a sealing material sheet on a solar cell provided in direct contact with either one of the front surface member and the back surface member. In a method for manufacturing a solar cell module, the method further includes a step of applying pressure while heating in a state where the sealing material sheet is formed, wherein the thickness of the sealing material sheet is 1.5 mm or more.

Preferably, the thickness of the sealing material sheet is 1.8 mm or more, and more preferably, the thickness of the sealing material sheet is 2.0 mm or more.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solar cell module according to the present invention will be described with reference to the drawings.

FIG. 1 is a structural sectional view showing the structure of a solar cell module according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a front surface member made of a material having a property of transmitting visible light such as tempered glass or transparent plastic, and 2 denotes a back surface member.
1, metal foil such as stainless steel, Cu, Fe, zinc steel plate, etc., and these metal foils are PVF (polyvinyl butyral), PET (polyethylene terephthalate), ETF
E (ethylene polytetrafluoroethylene), PVDF
A member having a three-layer structure sandwiched from both sides by a resin film such as (polyvinylidene fluoride) or PEN (polyethylene naphthalate) can be used.

Reference numeral 3 denotes a solar cell, for example, an amorphous semiconductor material typified by amorphous silicon, a crystalline semiconductor material such as single crystal silicon or polycrystalline silicon, or GaAs,
It can be configured using a compound semiconductor material such as CdTe or CuInSe ₂ . Also, in the figure, a plurality of solar cells 3 are electrically connected to each other by connecting members 4 made of a conductive member such as a copper foil. The number is not particularly limited, and may be one, for example.

As shown in FIG. 1, the solar cells 3 are embedded in a sealing material 5 and sealed between the front surface member 1 and the back surface member 2. The material of the sealing material 5 is EVA as described above.
Besides, for example, PVB (polyvinyl butyral), PV
C (polyvinyl chloride), polyurethane, silicone and the like can be used, but are not particularly limited to these materials.

In some cases, a frame (not shown) made of a metal frame such as Al is attached around the solar cell module.

Then, the electric power generated by the solar cells 3 by irradiation of light is output directly from the back side or the side of the module by a lead wire (not shown) or indirectly through a terminal box (not shown). Is taken out to the outside.

In the solar cell module having such a configuration, the heat resistance when the thickness of the sealing material 5 was variously changed was evaluated. In carrying out this evaluation, a glass having a thickness of about 3.2 mm was applied to the front surface member 1 and 30 μm, for example, to the rear surface member 2.
A member having a three-layer structure was used in which an Al foil having a thickness of about 40 μm was sandwiched from both sides by a tedra film having a thickness of about 40 μm. A solar cell made of single-crystal silicon is used for the solar cell 3, and a sealing material 5 is made of E.
VA was used.

The thickness of the sealing material 5 is shown in FIG.
This will be specifically described with reference to an enlarged sectional view of a main part of FIG. In the present invention, the thickness of the sealing material 5 refers to the thickness d1 of the sealing material 5 existing on the surface member 1 side of the solar cell 3 indicated by an arrow in FIG.
And the thickness (d1 + d2) of the thickness d2 of the sealing material 5 present on the back surface member 2 side. The thickness of the sealing member 5 is such that the surface member 1 has
Can be determined by measuring the thickness from the front surface to the back surface of the back member 2 and subtracting the total value of the thickness of the front member 1, the back member 2 and the solar cell 3 from the measured value.

Alternatively, in the end portion where the solar cell 3 does not exist, as shown in FIG. 3B, a flat portion is formed once after the thickness increases from the end portion, and the thickness further increases. In some cases, the shape may reach the sealing portion of the solar cell 3. In the solar cell module having such a shape, the thickness D at the flat portion indicated by the arrow and the thickness (d1) of the sealing material described with reference to FIG.
Since + d2) becomes substantially equal, the thickness D may be used as the thickness of the sealing material 5.

FIG. 3 is an explanatory diagram for explaining a method for evaluating heat resistance. Reference numeral 11 denotes a wooden base, and a mounting table 11A that simulates a roof base plate has an angle with respect to a horizontal plane of about 3 by short legs 11B and 11B and long legs 11C and 11C.
It is fixed diagonally so as to reach 0 ° C. Then, the solar cell module 12 is mounted on the mounting table 11A, and a lit wood of 15 cm square × 6 cm and a weight of 550 g ± 50 g is set as a fire class 13 at an arbitrary position on the solar cell module 12. Next, using a blower (not shown), a wind of 3 m / s is blown to the surface of the module 12 so as to hit the fire 13, and is left until the fire 13 is burned out. After the fire 13 is burned out, the solar cell module 12
Is removed from the mounting table 11A, and it is visually confirmed whether or not the back surface member is damaged by heat. At this time, it is evaluated that the heat resistance is sufficient for the one that has not been damaged, and the heat resistance is insufficient for the one that has been damaged because the sealing material may leak to the outside from the damaged part. evaluate. Then, the yield of those having sufficient heat resistance was examined by variously changing the thickness of the sealing material. The results are shown in the characteristic diagram of FIG.

As described above, conventionally, it was thought that the heat resistance was improved by reducing the amount of the sealing material.
According to FIG. 4, conversely, as the thickness of the sealing material 5 is increased, the yield is increased although the heat resistance is sufficient, and the yield can be increased to 90% or more although the heat resistance is sufficient. I understand. Further, by setting the thickness of the sealing material 5 to 1.8 mm or more, the yield can be 95% or more, and 2.0 mm or more.
By doing so, the yield could be increased to 98% or more. Therefore, in order to provide a solar cell module with improved heat resistance, the thickness of the sealing material 5 is preferably set to 1.5 mm or more, preferably 1.8 mm or more, and more preferably 2.0 mm or more.

As described above, according to the present invention, from the viewpoint of sufficient heat resistance as a building material, the thicker the sealing material 5 is, the better, but the thicker the thickness, the higher the material cost. Further, as described later, the process time for manufacturing the module increases. Therefore, the upper limit of the thickness of the sealing material 5 may be determined in consideration of cost and process time.

Further, as the sealing material 5, a PV other than EVA is used.
It goes without saying that the present invention can be applied to a solar cell module using other materials such as B, PVC, polyurethane and silicone.

Further, the present invention is not limited to the solar cell module having the structure shown in FIG. For example, there is a solar cell using an amorphous semiconductor such as amorphous silicon or amorphous silicon germanium, in which a glass is used as a substrate and an amorphous semiconductor solar cell is formed on the substrate.
In a solar cell module using such a solar cell, glass on which the solar cell is formed can be used as a surface member.

FIG. 5 is a structural sectional view showing the structure of such a solar cell module according to another embodiment of the present invention, and FIG. 6 is an enlarged sectional view of a main part. In these figures, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals.

First, referring to FIG. 5, in the solar cell module according to the present embodiment, one main surface of solar cell 3 is provided directly in contact with surface member 1, and sealing material 5 is
The entire surface of the solar cell 3 other than the one main surface is covered to seal the solar cell 3.

As shown in FIG. 6, the solar cell 3 has a surface member 1 made of glass as a substrate, and a transparent electrode 3a made of a light-transmitting conductive oxide such as SnO ₂ , ITO or ZnO on the substrate. An amorphous semiconductor layer 3b made of an amorphous semiconductor such as amorphous silicon, amorphous silicon carbide or amorphous silicon germanium and having a pin junction therein; and a metal electrode made of a metal such as Ag or Al 3c, and a plurality of solar cell elements UC formed of a stacked body are connected electrically in series with each other as is well known. In addition, the structure of the solar cell 3 does not need to be a structure in which a plurality of solar cell elements UC are electrically connected to each other in series as shown here.

In the solar cell module of the present embodiment, the encapsulating material 5 covers the entire surface of the solar cell 3 except for one main surface that is directly in contact with the surface member 1, and Since the sealing is performed, intrusion of moisture from the side surface can be prevented, and the reliability of the solar cell module can be improved.

In the solar cell module having such a configuration, as in the above-described embodiment, by setting the thickness D of the sealing material 5 indicated by an arrow in FIG. Although the yield can be 90% or more,
The yield is 9 by setting the thickness of the sealing material 5 to 1.8 mm or more.
The yield can be 5% or more, and the yield can be 98% or more by setting it to 2.0 mm or more.

Therefore, by using the solar cell module of this embodiment, a solar cell module having sufficient heat resistance as a building material can be provided, and the module can be directly provided without laying a metal plate such as an iron plate as in the related art. Can be installed on a roof base plate, so that the cost of the solar power generation system can be reduced and the strength of the roof can be improved.

Some solar cells using an amorphous semiconductor as described above use a metal foil, plastic or resin film as a substrate, and form a solar cell thereon. In a solar cell module using such a solar cell, a metal foil, a plastic or a resin film on which the solar cell is formed can be used as the back surface member.

FIG. 7 is a structural sectional view showing the structure of a solar cell module according to still another embodiment of the present invention, and FIG. 8 is an enlarged sectional view of a main part. In these figures, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals.

First, referring to FIG. 7, in the solar cell module according to the present embodiment, one main surface of solar cell 3 is provided directly in contact with back member 2, and sealing material 5 is
The entire surface of the solar cell 3 other than the one main surface is covered to seal the solar cell 3.

Referring to FIG. 8, the solar cell 3 has a back member 2 made of metal foil, plastic or resin film as a substrate, and a metal electrode made of a metal such as Ag or Al formed on the substrate. 3c, an amorphous semiconductor layer 3b made of an amorphous semiconductor such as amorphous silicon, amorphous silicon carbide or amorphous silicon germanium and having a pin junction therein, and an amorphous semiconductor layer 3b made of SnO ₂ , ITO or ZnO. A transparent electrode 3c made of a translucent conductive oxide;
In some cases, a solar cell element UC composed of a laminate of a comb-shaped collector electrode (not shown) made of Ag,
As is well known, they are electrically connected in series. The solar cell 3 is not necessarily a plurality of solar cell elements U
C may not have a structure electrically connected in series to each other.

Also in the solar cell module according to the present embodiment, the sealing material 5 covers the entire surface of the solar cell 3 except for one main surface that is in direct contact with the back surface member 2 to seal the solar cell 3. Therefore, intrusion of moisture from the side surface can be prevented, and the reliability of the solar cell module can be improved.

In the solar cell module of this embodiment, as in the above-described embodiment, it is sufficient that the thickness D of the sealing material 5 indicated by the arrow in FIG. Although it has heat resistance, the yield can be made 90% or more, and the yield can be made 95% or more by making the thickness of the sealing material 5 1.8 mm or more, and 2.0 mm or more. Thus, the yield can be made 98% or more.

Therefore, by using the solar cell module of this embodiment, a solar cell module having sufficient heat resistance as a building material can be provided, and the module can be directly provided without laying a metal plate such as an iron plate as in the related art. Can be installed on the roof base plate, so that the cost of the solar power generation system can be reduced and the strength of the house can be improved.

Next, a method for manufacturing the solar cell module of the present invention will be described.

The solar cell module of the present invention can be manufactured using a laminating apparatus as in the conventional case. FIG. 9 is a schematic configuration diagram showing a configuration of a laminating apparatus used for manufacturing the solar cell module of the present invention.

In the figure, reference numeral 21 denotes a lower housing; 22, a mounting table provided with a heater therein,
Is an upper housing that is air-tightly and detachably attached to the lower housing 21 via an O-ring 24, and 25 is a diaphragm provided on the upper housing 23, between the lower housing 21 and the upper housing 23. Is partitioned into a lower chamber 26 and an upper chamber 27.

Reference numeral 28 denotes a vacuum pump for evacuation,
9 is a lower chamber pipe connected to a vacuum pump 28 and communicates with the lower chamber 26; 30 is an upper chamber pipe connected to the vacuum pump 28 via a vacuum valve 31 and communicates with an upper chamber 27; The upper chamber 27 is opened and the other end is
Atmospheric pipe communicating with.

Then, as shown in the explanatory view of FIG. 10, the first sealing material sheet 5A, the solar cell 3, the second
Of the sealing material sheet 5B and the back surface member 2 in this order are mounted on the mounting table 22, and the upper housing 23 is airtightly sealed to the lower housing 21 via the O-ring 24. And the atmosphere valve 33 of the atmosphere pipe 32 is closed. The stacking order of the stacked body 50 may be opposite to that described above, and the stacked body 50 may be stacked from the back surface member 2 side.

Next, the vacuum valve 31 of the upper chamber pipe 30 is opened, and the vacuum pump 28 is operated to evacuate the interior of the upper chamber 27 and the lower chamber 26 via the upper chamber pipe 30 and the lower chamber pipe 29.

In this state, the heater of the mounting table 22 is energized to heat the stacked body 50 to a temperature of about 150 ° C., and the vacuum valve 31 of the upper chamber pipe 30 is closed, and the atmospheric valve 33 of the atmospheric pressure pipe 32 is closed. To open the upper chamber 27 to atmospheric pressure.
Then, due to the pressure difference between the upper chamber 27 and the lower chamber 26, the diaphragm 25 bends in the direction of the laminate 50, and the laminate 5
Pressure is applied from above and below in the heating state to zero.
Then, by this step, the first and second sealing material sheets 5A and 5B in the laminate 50 are softened and integrated, and
With the solar cell 3 embedded in the sealing member 5, the solar cell 3 is sealed between the front surface member 1 and the back surface member 2, and the solar cell module having the configuration shown in FIG. 1 is manufactured.

According to the manufacturing method of the present invention, by controlling the thickness of the first sealing material sheet 5A and the second sealing material sheet 5B, the solar cell having the desired thickness of the sealing material 5 can be obtained. Manufactures battery modules.

FIG. 11 is a characteristic diagram showing the relationship between the thickness of the sealing material sheet and the thickness of the sealing material in the manufactured solar cell module. Here, an EVA sheet having the same thickness is used as the first and second sealing material sheets, and the thickness of the sealing material sheet on the horizontal axis in FIG.
Shows the sum of the thicknesses of the sealing material sheets.

It is apparent from the figure that the sum of the thicknesses of the first and second sealing material sheets and the thickness of the sealing material in the solar cell module are substantially the same. Accordingly, by setting the sum of the thicknesses of the first and second sealing material sheets to be 1.5 mm or more, a solar cell module in which the thickness of the sealing material is 1.5 mm or more, and thus the heat resistance is improved. be able to. In addition, preferably, the sum of the thicknesses of the first and second sealing material sheets is 1.8 mm or more, so that the thickness of the sealing material is 1.8 mm or more, and thus the solar cell module has improved heat resistance. Can be manufactured. Furthermore, more preferably, the sum of the thicknesses of the first and second sealing material sheets is 2.0 mm or more, so that the thickness of the sealing material is 2.0 mm or more, and thus the solar cell further improved in heat resistance Modules can be manufactured.

Here, the EVA sheet is used as the first sealing material sheet and the second sealing material sheet. However, the invention is not limited to this. You may use the comprised 1st and 2nd sealing material sheet. The materials constituting the first and second sealing material sheets do not necessarily have to be the same, and the first sheet is formed by appropriately combining resin sheets made of the above resin materials.
And a second sealing material sheet. Furthermore, the above-mentioned sealing material sheet does not necessarily need to consist of one sheet, and what laminated | stacked several resin sheets may be used as a 1st or 2nd sealing material sheet.

Further, the thicknesses of the first and second sealing material sheets do not need to be the same, and even when the first and second sealing material sheets having different thicknesses from each other are used, these thicknesses may be reduced. The same effect is obtained as long as the sum of the thicknesses of the sealing material sheets satisfies the above-described conditions.

The upper limit of the thickness of the sealing material sheet is not particularly limited. However, if the thickness of the sheet is increased, the material cost increases, and the time required for the sheet to soften becomes longer. Process time also increases. Therefore, the upper limit of the thickness of the sealing material sheet to be used may be appropriately determined in consideration of these material costs and process time.

Further, in the solar cell module according to FIGS. 5 and 6, or FIGS. 7 and 8, the solar cell is provided on one of the front surface member and the back surface member. Therefore, in manufacturing the solar cell module, the stacked body obtained by stacking the other member on the solar cell via the sealing material sheet is mounted on the mounting table 22 and a solar cell module is manufactured in the same process as described above. be able to. Even in such a case, the thickness of the sealing material sheet and the thickness of the sealing material in the solar cell module are substantially the same. Therefore, by setting the thickness of the encapsulant sheet to 1.5 mm or more, a solar cell module having the encapsulant thickness of 1.5 mm or more and thus having improved heat resistance can be manufactured. Also, preferably, by setting the thickness of the sealing material sheet to be 1.8 mm or more, a solar cell module having a sealing material having a thickness of 1.8 mm or more and thus having improved heat resistance can be manufactured. Further, more preferably, by setting the thickness of the sealing material sheet to 2.0 mm or more, the thickness of the sealing material is 2.0 mm or more, and therefore, a solar cell module with further improved heat resistance can be manufactured. .

[0056]

As described above, according to the present invention, even when the solar cell module is heated, the sealing material made of a resin material does not leak to the outside. A solar cell module having heat resistance can be provided. Therefore, the module can be directly installed on the roof base plate without laying a substitute such as a roof tile or a metal plate as in the related art, and the cost of the solar power generation system is reduced and the strength of the roof is improved. be able to.

[Brief description of the drawings]

FIG. 1 is a structural sectional view showing a configuration of a solar cell module according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for specifically explaining the thickness of a sealing material in the present invention.

FIG. 3 is an explanatory diagram for explaining a method for evaluating heat resistance.

FIG. 4 is a characteristic diagram showing a relationship between a thickness of a sealing material and a yield of a solar cell module having sufficient heat resistance.

FIG. 5 is a structural sectional view showing a configuration of a solar cell module according to another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a main part of a solar cell module according to another embodiment.

FIG. 7 is a structural sectional view showing a configuration of a solar cell module according to still another embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a main part of a solar cell module according to still another embodiment.

FIG. 9 is a schematic configuration diagram illustrating a configuration of a laminating apparatus used for manufacturing a solar cell module.

FIG. 10 is a schematic configuration diagram showing a configuration of a laminate to be introduced into a laminating apparatus.

FIG. 11 is a characteristic diagram showing a relationship between a thickness of a sealing material sheet and a thickness of a sealing material.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 front surface member, 2 back surface member, 3 solar cell, 4 connection member, 5 sealing material, 3 a transparent electrode, 3 b amorphous semiconductor layer, 3 c metal electrode, 5 A first sealing Stopper sheet, 5
B: Second sealing material sheet

Claims (11)

[Claims] 1. A solar cell module in which a solar cell is sealed between a front member and a back member with a sealing material, wherein the thickness of the sealing material is 1.5 mm or more. And solar cell module. 2. The solar cell module according to claim 1, wherein the thickness of the sealing material is 1.8 mm or more. 3. The solar cell module according to claim 1, wherein the thickness of the sealing material is 2.0 mm or more. 4. The solar cell module according to claim 1, wherein the sealing material seals the solar cell by burying the solar cell therein. 5. The solar cell according to claim 1, wherein one main surface of the solar cell is provided in direct contact with one of the front surface member and the back surface member. The solar cell module according to any one of claims 1 to 3, wherein the solar cell is sealed by covering the entire surface. 6. A solar cell comprising a step of heating and applying pressure in a state where a back surface member, a first sealing material sheet, a solar cell, a second sealing material sheet, and a surface member are laminated. A method for manufacturing a solar cell module, wherein the sum of the thicknesses of the first sealing material sheet and the second sealing material sheet is 1.5 mm or more. 7. The method according to claim 6, wherein the sum of the thicknesses of the first sealing material sheet and the second sealing material sheet is 1.8 mm or more. 8. The method according to claim 7, wherein the sum of the thicknesses of the first sealing material sheet and the second sealing material sheet is 2.0 mm or more. 9. A step of heating and applying pressure in a state where the other member is laminated via a sealing material sheet on a solar cell provided directly in contact with one of the front member and the back member. The method for manufacturing a solar cell module according to claim 1, wherein the thickness of the sealing material sheet is 1.5 mm or more. 10. The film thickness of the sealing material sheet is 1.8 mm.
The method for manufacturing a solar cell module according to claim 9, wherein: 11. The film thickness of the sealing material sheet is 2.0 mm
The method for manufacturing a solar cell module according to claim 10, wherein: