JPH07193266A - Manufacture of solar battery module - Google Patents

Abstract

PURPOSE:To prevent imperfect bonding and bubble residue, by making the peripheral speed of a second step heating roller higher than that of a first step heating roller, and compression-bonding, with heat, surface coating material and rear coating material to a solar cell element. CONSTITUTION:At least the light incident surface is coated with surface coating material 101 composed of a resin film layer and filler. The surface opposite to the light incident surface is coated with rear coating material 102 composed of a resin film layer and filler. By using rollers 111, 112, 121, 122, 131, 132 whose surfaces are coated with rubbers 141, 142, 151, 152, 161, 162, respectively, the gap between first step heating rollers 111 and 112 is set to be 50-60% of the thickness of a solar battery module. The peripheral speed of the second step heating rollers 121, 122 is made larger than or equal to that of the first step heating rollers 111, 112, and the surface coating material 101 and the rear coating material 102 are compression-bonded to the solar battery module 100 by heating. Thereby a module of stable performance can be obtained.

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, and more particularly to a method for coating a solar cell in which a semiconductor layer as a photoelectric conversion member and a transparent conductive layer are formed on a conductive substrate.

[0002]

2. Description of the Related Art Recently, it is predicted that the greenhouse effect due to an increase in CO ₂ will cause global warming, and the demand for clean energy is increasing more and more. Further, for nuclear power generation that does not emit CO ₂ , a method for treating radioactive waste has not been established yet, and safer and cleaner energy is desired. Among the clean energies expected in the future, solar cells are particularly expected due to their cleanliness, safety and ease of handling.

In each of the solar cells, amorphous silicon, copper indium selenide, etc. can be manufactured in a large area and the manufacturing cost is low, so that they are eagerly studied.

Further, among the solar cells, a metal substrate such as stainless steel may be used as the base material because it is lightweight and has excellent weather resistance, impact resistance and flexibility.

When a metal substrate such as stainless steel is used as the base material, it is necessary to cover at least the light incident side surface unlike the case where a glass substrate is used. Conventionally, as in the case of using a glass substrate, pressure bonding with a vacuum laminator is common even when a metal substrate is used. This is a combination of a surface coating material, a solar cell element, and a back surface coating material on a metal plate having a heat source and is made of heat resistant rubber or the like.
In this method, a solar cell element is covered with a desired material by sealing with a ring and a sheet made of heat-resistant rubber or the like and then vacuuming the inside. This method is characterized in that pressure is applied relatively evenly to the irregularities of the solar cell element, and the irregularities can be coated with a substantially uniform thickness, because pressure is applied at atmospheric pressure through a sheet made of heat-resistant rubber or the like.

However, according to this method, when a long solar cell module is thermocompression bonded, the metal plate for thermocompression bonding is naturally large in size. In a large-sized apparatus that performs thermocompression bonding, problems such as leakage at the time of decompression and the capacity of the vacuum pump occur.

Further, there are pressure restrictions. That is, it is difficult to apply a pressure higher than 1 atm because of the method of pressure bonding at atmospheric pressure through a sheet made of heat resistant rubber or the like. Therefore, there are many restrictions on the type of resin used as the filler. That is, from the viewpoint of the melting temperature and the melt viscosity of the filler and the heat resistance of other coating materials, generally only the filler having a low melt viscosity was used. When such a filler having a low melt viscosity is used in a solar cell module, the adhesive strength of the filler may be reduced under a high temperature environment outdoors. In particular, there were times when peeling occurred at the ends of the coating material.

There is yet another manufacturing problem.
After cutting the coating material into individual sheets, it is common to stack the solar cell modules on the back surface coating material while aligning them, and then stacking the multilayer coating material on each . Therefore, it takes time to cover the solar cell module. In addition, wrinkles and deviations occur in the cut cover material, and in the completed cover material of the solar cell module, only a certain portion is twice as thick,
In some places, the problem arises of not having the desired dressing.

A method has also been proposed in which each coating layer is pressure-bonded to the solar cell element by a roller.

However, in this method, pressure variations are likely to occur around the current collecting grid formed on the surface of the solar cell element and the irregular shape of the solar cell element substrate, and the protrusion of the filler, uneven thickness, etc. Somewhat easy to occur. The protrusion and uneven thickness may cause current leakage.

Further, some bubbles are apt to remain and adhesion is apt to occur, and there is a problem in that peeling and defective appearance due to bubbles and deficiency of adhesion may occur especially after a high temperature and high humidity storage durability test.

[0012]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional method of coating a solar cell element, and manufactures a solar cell module which does not have defective adhesion or residual bubbles. The purpose is to provide a method.

[0013]

The above object is to provide a solar cell module comprising a solar cell element having a semiconductor layer as a photoelectric conversion member and a transparent conductive layer formed on a conductive substrate. The surface is coated with a surface coating material consisting of a resin film layer and a filler, the surface of the opposite side to the light incident surface is coated with a back surface coating material consisting of a resin film layer and a filler in a method for manufacturing a solar cell module, By the roller whose surface is covered with rubber rubber, the roll gap of the first heating roller is set to 50% to 100% of the thickness of the solar cell module, and the peripheral speed of the second heating roller is set to the first. A solar cell module characterized in that the surface coating material and the back surface coating material are heated and pressure-bonded to the solar cell element at a speed higher than the peripheral speed of the heating roller at the stage. It is achieved by the method for producing Yuru.

[0014]

The present inventor has conducted extensive studies in order to solve the above-mentioned drawbacks, and as a result, fed a film obtained by integrally laminating the respective covering materials on the front and back sides in a roll form and supplying it with a heated roller. It was found that a solar cell module with stable performance can be obtained by thermocompression bonding, adjusting the roll gap of the first-stage thermocompression-bonding rubber rubber roll, and adjusting the second-stage roll peripheral speed.

That is, by performing such control,
The filler can be pushed into the irregularities of the solar cell element to prevent it from sticking out, uneven thickness, and eliminating bubbles to improve the adhesive strength. Also, the surface of the solar cell module is not scratched.

[0016]

Embodiments Embodiments of the present invention will be described.

FIG. 1 is a diagram best representing the features of the present invention.

In FIG. 1, 100 is a solar cell element, 1
01 is a surface coating material, 102 is a back surface coating material, 111 is a first
Upper heating roller 112, first lower heating roller, 121 second upper heating roller, 122 second lower heating roller, 131 upper cooling roller, 132 lower cooling roller, 141, 142, 151,152,1
61 and 162 are rubber rubbers, and 170 is a roll gap.

The solar cell element 100 of the present invention has at least a conductive substrate on which a semiconductor layer as a photoelectric conversion member and a transparent conductive layer are formed, and has the schematic structure shown in FIG. In FIG. 2, 200 is a conductive substrate, 201 is a collector electrode, 202 is a transparent conductive layer, 203 is a semiconductor layer, and 204
Is a back surface reflection layer.

The conductive substrate 200 of the solar cell of the present invention is
At the same time as the substrate of the solar cell element, it also serves as a lower electrode. Examples of the material include silicon, tantalum, molybdenum, tungsten, stainless steel, aluminum, copper, titanium, carbon sheet, galvanized steel sheet, resin film having a conductive layer formed thereon, and ceramics. A metal layer, a metal oxide layer, or a metal layer and a metal oxide layer may be formed as the back reflection layer 204 on the conductive substrate 200. The material of the metal layer is Ti, C
r, Mo, W, Al, Ag, Ni or the like is used, and ZnO, TiO ₂ , SnO ₂ or the like is used as the metal oxide layer. As a method of forming the metal layer and the metal oxide layer, there are a resistance heating vapor deposition method, an electron beam vapor deposition method, a sputtering method and the like.

The semiconductor layer 203 serving as the photoelectric conversion member of the solar cell used in the present invention includes pin-junction amorphous silicon, pn-junction polycrystalline silicon, CuInSe ₂ / Cd.
Compound semiconductors such as S can be raised. The semiconductor layer 20
In the case of amorphous silicon, 3 is Cu by plasma CVD of silane gas or the like, and in the case of polycrystalline silicon, a sheet of molten silicon or a heat treatment of amorphous silicon.
In the case of InSe ₂ / CdS, it is formed by a method such as electron beam evaporation, sputtering, and electrodeposition (deposition by electrolytic decomposition of electrolytic solution). Examples of the material used for the transparent conductive layer 202 of the solar cell used in the present invention include In ₂ O ₃ and SnO.
₂ , In ₂ O ₃ —SnO ₂ (ITO), ZnO, TiO ₂ ,
There are crystalline semiconductor layers doped with Cd ₂ SnO ₄ , high-purity impurities, and the like, and methods of formation include resistance heating vapor deposition, electron beam vapor deposition, sputtering, spraying, CVD, and impurity diffusion.

A collector electrode 201 on a grid may be provided on the transparent conductive layer 202 in order to efficiently collect a current generated by a photovoltaic force. The material of the collector electrode 201 is Ti, Cr, Mo, W, A.
Conductive pastes such as 1, Ag, Ni, Cu, Sn and silver paste are used. As the method for forming the collector electrode 201, sputtering using a mask pattern, resistance heating, a vapor deposition method such as CVD, or a method in which a metal layer is vapor-deposited on the entire surface and then etched and patterned, photo-CVD.
By directly forming a current collecting grid electrode pattern,
There are a method of forming by plating after forming a mask of a negative pattern of the grid electrode pattern, a method of forming by printing a conductive paste, and the like. The conductive paste is usually a fine powder of silver, gold, copper, nickel, carbon, etc. dispersed in a binder polymer. As the binder polymer, polyester, epoxy,
There are resins such as acrylic, alkyd, polyvinyl acetate, rubber, urethane, and phenol.

The solar cell element 100 produced by the above method
Are connected in series or in parallel depending on the desired voltage or current. It is also possible to integrate the solar cell element 100 on an insulated substrate to obtain a desired voltage or current.

The surface coating material 101 in the present invention is a laminated film comprising at least an outermost surface coating resin film layer and a filler, and is supplied in a roll form.

The resin film for outermost surface coating located on the outermost surface of the surface coating material 101 has a surface contact angle of water of 70 in order to prevent the solar cell module from being contaminated by rain or the like and its output being lowered. It is desirable that the resin is not less than °. More preferably, it is desirable to use a fluororesin film.

This fluororesin film is transparent, has excellent weather resistance, and is required to have some mechanical strength. Generally, fluororesins are excellent in that respect. Examples of materials suitably used in the present invention include tetrafluoroethylene-
Ethylene copolymer (ETFE), trifluoroethylene chloride (PCTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), fluorine Vinylidene fluoride resin (PVDF), vinyl fluoride resin (PV
F) etc. are raised.

The filler is required to have at least an adhesive force for favorably adhering the coating resin film and the solar cell element. Also, when filling the irregularities on the solar cell element, for example, when laminating an intermediate hard film or a glass fiber non-woven fabric between the solar cell element and the resin film for the outermost surface coating, the adhesive force between the laminated film and the non-woven fabric is also required. Thermoplasticity, scratch resistance, non-flammability, shock absorption,
It is desirable to have excellent heat resistance, moisture resistance, and weather resistance.
Particularly, as the surface coating material 101, from the viewpoint of transparency,
Examples thereof include ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), silicone resin, epoxy resin, acrylic resin and fluororesin. These resins include cross-linking agents and thermal antioxidants to increase heat resistance, UV absorbers and photo-oxidizing agents for light stability and weather resistance, and silane coupling agents to increase adhesive strength. It is possible to add a titanate coupling agent or the like. Since the back surface coating material 102 may be opaque, a resin different from that of the front surface coating material 101 may be used. However, when the difference in thermal expansion coefficient or the like is large, warpage may occur in the solar cell module. Therefore, the same resin is more preferable.

In the case of a solar cell having conductivity, the film used for the back surface coating material 102 needs to be more completely insulated. Therefore, examples of the insulating film include nylon, polyethylene, polyester, polystyrene and the like. .

The heating rollers 111, 112, 1 of the present invention
21 and 122 are a method of heating from outside the roller with an infrared heater or hot air, a method of heating by providing a heating element such as a ceramic heater or an induction heater inside the roller, or a heating medium such as silicone oil inside the roller. And a method of holding a heat medium around the heater inside the roller to suppress variations in temperature.

As the cooling rollers 131 and 132, there are a method of cooling with cold air from the outside of the rollers, a method of circulating cooling water and the like inside the rollers. Further, in the cooling roller, nipping due to high pressure is not performed, and therefore the surface may be made of metal in order to improve the heat dissipation of the cooling roller.

Rubber rubber 141, 142, 151, 15
Nos. 2, 161 and 162 are necessary in order to prevent the surface of the solar cell module from being scratched and to push the filler into the irregularities of the solar cell element 100 to eliminate bubbles and improve the adhesive strength.

The surface hardness is preferably 50 ° or less, and the rubber thickness is preferably 5 mm or more. When the surface hardness is 50 ° or less and the rubber thickness is 5 mm or more, the effects of improving the adhesive force and reducing bubbles are further enhanced. Examples of the material include silicon rubber, fluororubber, nitrile rubber, urethane rubber and the like. Considering the surface accuracy of the surface and the prevention of stains, fluororubber or silicone rubber is preferable.

The peripheral speed of the second-stage heating roller may be higher than that of the first-stage heating roller.
If the difference in peripheral speed between the heating roller of the second step and the heating roller of the second step exceeds 10%, scratches may occur on the surface due to slip, or the covering material may stretch and become thin, so that 10
% Or less is preferable.

[0034]

EXAMPLES The present invention will be described in detail below based on examples. The present invention is not limited to these examples.

Example 1 First, an amorphous silicon solar cell element was manufactured. The creation procedure will be described with reference to FIG.

On the cleaned stainless steel (thickness 125 μm) conductive substrate 200, the back surface reflection layer 204 is formed by the sputtering method.
As an Al layer (thickness 500 nm) and a ZnO layer (thickness 50)
0 nm) was sequentially formed. Then, an n-type a- is formed from a mixed gas of SiH ₄ , PH ₃ and H ₂ by a plasma CVD method.
An i-type a-Si layer is formed from a mixed gas of SiH ₄ and H ₂ , a p-type microcrystalline μc-Si layer is formed from a mixed gas of SiH ₄ , BF _3, and H _2, and an n layer (film Thickness 15 nm) / i layer (film thickness 400 nm) / p layer (film thickness 10 nm) / n layer (film thickness 10 nm) / i layer (film thickness 80 nm) / p layer (film thickness 10)
A tandem a-Si photoelectric conversion semiconductor layer 203 having a layer structure of (nm) was formed.

Next, as a transparent conductive layer 202, In ₂ O _{3 is used.}
A thin film (film thickness 70 nm) was formed by vapor-depositing In in an O ₂ atmosphere by a resistance heating method.

Further, a collector electrode 201 was formed by screen printing of a silver paste (manufactured by DuPont, product number # 5007) to obtain a solar cell element.

The size of the solar cell element 100 is 30 cm.
The size of the solar cell element 100 is two, and the two solar cell elements 100 are adhered to each other with a silver paste (product number # 220 manufactured by Quesl Co., Ltd.) via a copper tab 205 (thickness 50 μm), and a polyamide resin (manufactured by 3M company) is used as the insulator 208. A Kapton film (trade name, thickness: 50 μm) was provided as shown in FIG. 3 and connected in series. Further, the output terminal 207 was taken out from the stainless conductive substrate 200 using the same copper tab and silver paste.
The other output terminal 207 'was taken out from the collector electrode 201 in the same manner as in series connection.

Next, the surface coating material 101 and the back surface coating material 1
A method for producing the integrated laminated film 02 will be described with reference to FIG.

In this example, a fluororesin film was used as the outermost surface covering material 401. ETFE as a fluororesin film (Asahi Glass, trade name Aflex, thickness 50μ
m) was used. The fluororesin film was used as a carrier film (support film). Corona discharge treatment was applied to one surface of this fluororesin film, and the filler 4
02 was laminated to obtain a film. As the filler 402, a mixture of 100 parts of EVA (manufactured by DuPont Mitsui Polychemical, trade name Evaflex P-2805) and 1.5 parts of a crosslinking agent (manufactured by Benwald Co., trade name Lupasol 101) was used. As a device, an extruder and a T-die were used, and the filler 402 having a thickness of 250 μm was laminated on the fluororesin film.

On the filler 402 side of the obtained laminated film, as a middle layer 403, a hard film polycarbonate film (trade name: Iupilon, manufactured by Mitsubishi Gas Chemical Co., Inc.,
(Thickness 100 μm) was laminated using a roller heated to 120 ° C. Further, the same filler 402 was again provided on the side of the intermediate layer by the same method with a thickness of 250 μm. This gives 4
An integrated laminated film having a layer structure was obtained.

An integral laminated film was similarly prepared for the back surface coating material. That is, nylon (made by DuPont, trade name Dartec, thickness 75
μm) as a carrier film and the same filler 4 as above
02 was laminated in the same manner with a thickness of 150 μm.

Then, the solar cell element 100, the surface coating material 101 and the back surface coating material 102 produced by the above method.
Was thermocompression bonded using a device as shown in FIG. At that time, the pressure of the heating roller was 3 kg / cm ² , and the temperature was 16
The peripheral speed at 0 ° C. and the first step was 0.15 m / min. Further, the surface hardness of the rubber rubber of the heating roller is 50 °, the rubber thickness is 5 mm, and the gap between the rolls of the first stage is 750.
The peripheral speed of the second stage was 0.1545 m / min. Furthermore, the solar cell module created by the above method is put into an oven and the temperature is changed to 150 ° C.
-The filler 402 was crosslinked by heating for 30 minutes. This was evaluated by the following test method. The evaluation results are shown in Table 1.

1. Appearance test (wrinkles, bubbles, curls, etc.) The occurrence of bubbles and the presence or absence of wrinkles, curls, etc. according to the examples of the present invention are evaluated. The number of non-defective products per 10 solar cell modules is shown.

2. High temperature and high voltage dielectric breakdown test Short-circuit the anode and cathode of the solar cell module. A solution with an electric conductivity of 35,000 hm · cm or more (surfactant, containing Triton X-100, 0.1% in trade name)
Soak in. At that time, the output terminal 207 of the sample is not soaked in the solution. Then, the cathode of the power source is immersed in the solution, and the anode of the power source is connected to the output terminal 207 of the sample.
The case where a voltage of 2000 V is applied from the power supply and only a current of less than 0.5 μA flows is regarded as a pass. In Table 1, the pass was rated as O and the fail was rated as X. Further, when the reproducibility was poor, it was marked with Δ.

3. High-temperature and high-humidity storage test The appearance was evaluated after the solar cell module was stored at 85 ° C / 85% (relative humidity) for 100 hours. The number of non-defective products per 10 solar cell modules is shown.

4. Adhesive force The adhesive force was measured by a T-shaped peeling test method using a tensile tester by clipping the end of the covering material, and qualitatively evaluated. Those that can be easily peeled off are marked with X, and those with sufficient adhesive strength are marked with ○,
In the case of the middle, it was marked as Δ.

5. Time required for thermocompression bonding The time for completely filling and coating the solar cell module, not including the crosslinking reaction time of the filler 402.

Example 2 The solar cell element 100 was prepared according to Example 1.

The surface coating material 101 was prepared according to Example 1, but a non-woven fabric of glass fiber (Clen glass 230, brand name Clen glass 230, thickness 125 μm, manufactured by Clen Glass Co., Ltd.) was used instead of polycarbonate.

In order to improve the penetration of the filler 402 into the clean glass, the gap between the rolls of the first-stage heating roller was set to 500 μm.

Others are exactly the same as in the first embodiment.

(Example 3) The solar cell element 100 was prepared according to Example 1, but the conductive substrate 200 had a thickness of 250 μm.
m stainless steel substrate was used.

The thickness of the rubber rubber of the heating roller is 7 m
m and the surface hardness was 40 °.

Others are exactly the same as in the first embodiment.

Example 4 The solar cell element 100 was prepared according to Example 1.

The surface coating material 101 was made of Clen glass as in Example 2, and the Clen glass and the filler 4 were used.
02 (EVA) was laminated to form a 6-layer structure.

Further, the speed of the roller of the second step was set to 0.1575 m / min, which was 5% faster than the speed of the first step.

The other points are exactly the same as in the first embodiment.

Comparative Example 1 The solar cell element 100, the front surface coating material 101, and the back surface coating material 102 were prepared in exactly the same manner as in Example 1.

The same apparatus as in Example 1 was used for the thermocompression bonding, but the surface hardness of the rubber rubber was 70 °,
The rubber thickness was 3 mm.

Comparative Example 2 The solar cell element 100, the front surface coating material 101, and the back surface coating material 102 were prepared in exactly the same manner as in Example 1.

An apparatus similar to that used in Example 1 was used as the apparatus for thermocompression bonding, but without the roll gap of the first stage of the heating roller.

Others are exactly the same as in the first embodiment.

Comparative Example 3 The solar cell element 100, the front surface covering material 101, and the back surface covering material 102 were prepared in exactly the same manner as in Example 1.

The thermocompression bonding apparatus used was exactly the same as in Example 1, but the speed of the second roller of the heating roller was the same as that of the first roller.

Others are exactly the same as in the first embodiment.

(Comparative Example 4) The solar cell element 100 was prepared according to Example 1.

The structures of the front surface coating material 101 and the back surface coating material 102 were exactly the same as in the first embodiment. However, instead of integrally laminating the sheets having the respective constitutions, the respective sheets were placed one on top of the other in sequence, and finally, silicon rubber was applied and degassed by using a vacuum pump to atmospheric pressure. Next, it was put into a heating oven and heated, and each layer was thermocompression-bonded to cover the solar cell element 100.

Table 1 below shows the conditions of each Example and Comparative Example, and Table 2 shows the evaluation results.

[0072]

[Table 1]

[0073]

[Table 2] (1) Appearance: Number of good products per 10 pieces (2) High temperature and high pressure dielectric breakdown test: ○: Pass △: Poor reproducibility ×: Fail (3) High temperature and high humidity storage test: Number of good products per 10 pieces ( 4) Adhesive strength: x: easily peeled off ◯: sufficient adhesive strength Δ: in the middle thereof As is clear from the results in Table 2, good results were obtained in all the examples of the present invention. . In Comparative Example 1, many small air bubbles remain, and in Comparative Example 2, the total thickness of the solar cell module varies or the solar cell element 100 cannot be smoothly inserted and is bent. In Comparative Example 3, wrinkles and curls are generated, and the space between the solar cell elements 100 in series is narrowed or contacted. Comparative Example 4 has a good evaluation result, but the time required for thermocompression bonding is long and the productivity is poor.

[0074]

According to the present invention, by adjusting the surface hardness and the rubber thickness of the rubber rubber roll for thermocompression bonding, and adjusting the gap between the rolls in the first stage and the roll peripheral speed in the second stage, Surface coating material 101 and back surface coating material 10 which are integrally laminated
In the manufacturing method for coating the solar cell element 100 using 2
It is possible to stably manufacture a solar cell having no adhesion failure and no bubble remaining with high productivity and high quality.

[Brief description of drawings]

FIG. 1 is a diagram best representing the features of the present invention, and is a schematic diagram of a manufacturing apparatus.

FIG. 2 is a schematic cross-sectional view showing the basic structure of the solar cell element 100 of FIG.

FIG. 3 is a schematic cross-sectional view of serialized solar cell elements 100.

FIG. 4 is a schematic cross-sectional view showing the basic configuration of a solar cell module produced according to the present invention.

[Explanation of symbols]

100 solar cell element, 101 surface coating material, 102 back surface coating material, 111 first stage upper heating roller, 112 first stage lower heating roller, 121 second stage upper heating roller, 122 second lower stage heating roller, 131 Cooling upper roller, 132 Cooling lower roller, 141, 142, 151, 152, 161, 162 rubber rubber, 200 conductive substrate, 201 current collecting electrode, 202 transparent conductive layer, 203 semiconductor layer, 204 back reflection layer, 205 series copper Tab, 206 paste, 207 output copper tab, 208 insulating film, 401 outermost surface covering material, 402 filler, 403 intermediate layer, 404 back surface insulating material.

Claims (5)

[Claims] 1. A solar cell module comprising a solar cell element in which a semiconductor layer as a photoelectric conversion member and a transparent conductive layer are formed on a conductive substrate, and at least a light incident side surface is filled with a resin film layer. In the method of manufacturing a solar cell module, the surface of the solar cell module is covered with a surface covering material, and the surface opposite to the light incident surface is covered with a back surface covering material composed of a resin film layer and a filler. With the rollers, the roll gap of the first heating roller is set to 50% to 100% of the thickness of the solar cell module, and the peripheral speed of the second heating roller is set to the peripheral speed of the first heating roller. A method for manufacturing a solar cell module, wherein the front surface coating material and the back surface coating material are thermocompression bonded to the solar cell element at a higher speed. 2. The method for producing a solar cell module according to claim 1, wherein a roller covered with a rubber rubber having a surface hardness of 50 ° or less is heated and pressure-bonded to the solar cell element. 3. The method for producing a solar cell module according to claim 1, wherein a roller covered with a rubber rubber having a rubber thickness of 5 mm or more is heated and pressure-bonded to the solar cell element. 4. The solar cell module according to claim 1, wherein two or more heating rollers each having a surface covered with a rubber rubber are pressure-bonded to the solar cell element. Production method. 5. The peripheral speed of the second heating roller is set to be faster than that of the first heating roller, and the difference is 10% or less of the peripheral speed of the first heating roller. The method for manufacturing a solar cell module according to any one of claims 1 to 4.