TWI624956B - Solar battery module and manufacturing method thereof - Google Patents

Abstract

The present invention provides a solar cell module 10 comprising: a light transmissive substrate 1 that is transparent to light; a light penetrating substrate 1 that is external to the light penetrating substrate 1 and that is incident on the light penetrating substrate 1 The surface sealing material 2 composed of an olefin resin, and the surface sealing material 2, on the side opposite to the side where the light-transmitting substrate 1 is located, and having components constituting the electrode, among the components excluding the glass component a photovoltaic element 3 comprising a silver-containing ratio of 75% or more of silver and 0.001% or more and 25% or less of the light-receiving surface side electrode 31; and the photovoltaic element 3 is positioned on the side opposite to the side of the surface sealing material 2 The sealing material 4; the backing plate 5 on the side opposite to the side on which the photovoltaic element 3 is located, based on the inner sealing material 4.

Description

Solar battery module and manufacturing method thereof

The present invention relates to a solar cell module that converts light energy into electric power and a method of manufacturing the same.

In the past, regarding the assembly technology of a solar cell module, there has been proposed a surface sealing material in which an ethylene vinyl acetate copolymer is disposed on a light transmissive substrate such as a glass substrate and the photovoltaic elements are arranged. A technique of laminating an inner sealing material of an ethylene vinyl acetate copolymer and a back sheet on a photovoltaic element.

The sealing material for solar cell modules has been the use of ethylene vinyl acetate copolymer. When manufacturing a solar cell module, the glass substrate, the surface sealing material, the photovoltaic element, the inner sealing material, and the backing plate are sequentially laminated. The inner sealing material is an essential component for ensuring the insulation properties of the photovoltaic element. An example of the sealing material is disclosed in Patent Document 1.

In the solar cell module of the past, although the electrode of the photovoltaic element contains a plurality of metal components, the oxidation of the electrode caused by the acid generated by the sealing material is suppressed by including a reducing component in the sealing material.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Publication No. 2013-511156

However, in the past solar cell modules, since the sealing material contained a reducing component, the cost of the solar cell module in the past was high. In addition, due to the large amount of silver constituting the electrode, the cost of the solar cell module in the past is quite high.

The present invention has been made in view of the above, and is intended to be a solar battery module that can be manufactured at low cost and has high reliability.

In order to solve the above problems and achieve the object, the present invention includes: a light transmissive substrate that transmits light; and a light penetrating side that is incident on the light transmissive substrate outside the light transmissive substrate a surface sealing material comprising an olefin resin; and a component other than a glass component in a component constituting the electrode, on the side opposite to the side on which the light-transmitting substrate is located, based on the surface sealing material a photovoltaic element comprising a silica having a mole ratio of 75% or more and 0.001% or more and 25% or less of an aluminum light-receiving surface side electrode; and the side of the surface sealing material is located on the basis of the above-mentioned photovoltaic element The inner side sealing material on the opposite side; the backing plate on the side opposite to the side on which the above-mentioned photovoltaic element is located, based on the above inner sealing material.

According to the present invention, the effect of a solar cell module which can be manufactured at low cost and has high reliability is achieved.

10‧‧‧Solar battery module

10S‧‧‧ laminated structure

1‧‧‧Light penetrating substrate

2‧‧‧Surface sealing material

3‧‧‧Photovoltaic components

4‧‧‧ Inside sealing material

5‧‧‧ Backplane

31‧‧‧Photon side electrode

32‧‧‧ inside electrode

101‧‧‧Operating cabin

101H‧‧‧heater

101a‧‧‧1st cabin

101b‧‧‧2nd cabin

101c‧‧‧Transportation board

101g‧‧‧ hot plate

102‧‧‧ cabin vacuum pump

103‧‧‧Cooling conveyor belt

Fig. 1 is a schematic view showing a cross section of a solar battery module according to the first embodiment.

Fig. 2 is a view showing a method of manufacturing a solar battery module according to the first embodiment; A schematic view of a section of a laminate device used.

Fig. 3 is a side view showing a cooling conveyor used in the method for manufacturing a solar battery module according to the first embodiment.

Fig. 4 is a view showing the relationship between the heating time and the temperature of the sealing material in the laminating step of the laminate press step of the laminating step and the cross-linking step, respectively.

Fig. 5 is a view showing the relationship between the heating time and the temperature of the sealing material in the crosslinking step of the lamination step of the lamination step and the crosslinking step, respectively.

Fig. 6 is a view showing the relationship between the heating time and the temperature of the sealing material in the laminating pressurizing step in which the laminating step and the cross-linking step are carried out together.

Fig. 7 is a view showing the results of a deterioration acceleration test in an environment of a temperature of 85 ° C and a humidity of 85%, which is called high temperature and high humidity.

Fig. 8 is a view showing the relationship between the temperature of the sealing material composed of the ethylene vinyl acetate copolymer and the cell rupture probability in the solar cell module when the solar cell module is press-pressed by the laminating device. Schematic diagram of the relationship.

Fig. 9 is a view showing the relationship between the temperature of the sealing member made of polyethylene and the probability of breaking the unit in the solar cell module when the solar cell module is pressed by the laminating device.

Hereinafter, a solar cell module and a method of manufacturing the same according to embodiments of the present invention will be described in detail based on the drawings. Further, the embodiments are not intended to limit the invention, and a part of the embodiments may be modified within the scope of the gist of the invention. In order to make the embodiment easy to understand, the scale of each component may be different from actual ones.

Embodiment 1

Fig. 1 is a schematic view showing a cross section of a solar battery module 10 of the first embodiment. As shown in FIG. 1, the solar cell module 10 includes a light transmissive substrate 1 that is transparent to light, and is positioned outside the light transmissive substrate 1, and light incident on the light transmissive substrate 1 is transmitted through the side. a surface sealing material 2 at a position; a photovoltaic element 3 positioned on the opposite side of the side opposite to the side of the light-transmitting substrate 1 with respect to the surface sealing material 2; and a position opposite to the side of the surface sealing material 2 with respect to the photovoltaic element 3 The inner seal member 4 on the side; the back sheet 5 on the side opposite to the side on which the photovoltaic element 3 is located, based on the inner seal member 4. That is, the solar cell module 10 is a laminated body in which the light-transmitting substrate 1, the surface sealing material 2, the photovoltaic element 3, the inner sealing material 4, and the backing plate 5 are sequentially laminated.

The light transmissive substrate 1 is a glass substrate. The light-transmitting substrate 1 is not limited to a glass substrate as long as it has a function of light transmissibility. The light transmissive substrate 1 may also be a light transmissive resin plate. The sunlight is incident on the surface of the light-transmitting substrate 1, and the incident light penetrates the light-transmitting substrate 1 and the surface sealing material 2 to reach the photovoltaic element 3, and the light energy is converted into electric power in the photovoltaic element 3.

The surface sealing material 2 is composed of an olefin resin. The olefin resin is, for example, a polypropylene resin or a polyethylene resin. Specifically, the surface sealing material 2 is a multi-layered sheet made of a translucent thermosetting resin obtained by adding a silane coupling agent and a crosslinking agent to a polyolefin-based resin which does not generate an acid. The laminar body of (sheet). The polyolefin resin may be replaced by a light penetrating resin that does not generate an acid. The polyolefin resin may be replaced by a polypropylene resin or a polycarbonate polyurethane resin.

The olefin-based resin constituting the surface sealing material 2 is preferably added to a part or all of a crosslinking agent for improving weather resistance, strength, and adhesion. Follow-up It refers to the adhesion between the light-transmitting substrate 1 and the surface sealing material 2, and the adhesion between the surface sealing material 2 and the photovoltaic element 3. A method of crosslinking, for example, a method of generating radicals by heat. Further, the olefin-based resin constituting the surface sealing material 2 is preferably added with an ultraviolet absorber which is useful for improving light resistance. In order to increase the output of the solar cell module 10, it is preferable to use a small amount of the ultraviolet absorber.

The photovoltaic element 3 has a component other than the glass component in the configuration constituting the electrode, and includes a light-receiving surface side electrode 31 having a molar ratio of 75% or more and 0.001% or more and 25% or less of aluminum. The light-receiving surface side electrode 31 is composed of metal particles and glass. When the component ratio is excluded from the glass component of the component constituting the light-receiving surface side electrode 31, the composition ratio of silver to aluminum. Although the photovoltaic element 3 also has the inner side electrode 32 and the structure of the photovoltaic element 3, the inner side electrode 32 molar ratio does not necessarily contain 75% or more of silver and 0.001% or more and 25% or less of aluminum. The photovoltaic element 3 is configured to take out electric power via the light-receiving surface side electrode 31 and the back side electrode 32. In the solar cell module 10, the light-receiving surface side electrode 31 is composed of a plurality of photovoltaic elements 3, and the electrodes of the plurality of photovoltaic elements 3 are electrically connected by solder. In this way, solder can be used to connect the plurality of electrodes contained in the photovoltaic element 3. For example, a solder of a Sn-Ag-Cu alloy having a melting point of 219 ° C or a solder of a Pb—Sn alloy having a melting point of 183 ° C can be used.

Further, as a material constituting the light-receiving surface side electrode 31, in addition to silver and aluminum, Cu, Au, Pt, Fe, Pd, Mn, Mo, S, C, O, N, P, Ni may be partially or wholly contained. Impurities of Cr, Co, Zn, Sn, Pb, Si, W, Mg, Ti, Sc, In, Sb, Te, Cd, Se, Ir, K, Li, Na, and P. In the present invention, even when the impurities are contained, the light-receiving surface side electrode 31 contains silver having a molar ratio of 75% or more and aluminum of 0.001% or more and 25% or less.

In view of the above, the photovoltaic element 3 has a molar ratio of more than 75%. Silver, 0.001% or more and 25% or less of the light-receiving surface side electrode of aluminum. Hereinafter, the ratio of silver to aluminum contained in the light-receiving surface side electrode 31 will be described. Since the standard unipolar potential relative to silver is +0.799V and the standard unipolar potential of aluminum is -1.676V, aluminum is more susceptible to oxidation than silver. Since the light-receiving surface side electrode 31 contains aluminum, oxidation of silver contained in the light-receiving surface side electrode 31 can be suppressed, and therefore the electric resistance of the light-receiving surface side electrode 31 does not easily increase. Therefore, it is preferable that the light-receiving side electrode 31 contains aluminum.

Next, the content ratio of aluminum will be described. The light-receiving surface side electrode which does not contain aluminum, that is, the time required for deterioration of the light-receiving surface side electrode made of silver alone, is delayed, and the reliability of the solar cell module is increased when the deterioration of the light-receiving side electrode is delayed. Since silver is +1 valence and aluminum is +3 valence, when the content ratio of aluminum in the light-receiving side electrode is more than 1/4 times the total molar ratio, it is difficult to ensure the conductivity of silver. Therefore, when the light-receiving surface side electrode 31 is composed of aluminum and silver which are lower than the standard unipolar potential of silver, the price of aluminum which is lower than the standard unipolar potential is several times or more, that is, three times or more of that of aluminum. At the same time, aluminum having a low standard unipolar potential is less than a valence of silver, that is, preferably 1 or less of silver. In addition, when the amount of aluminum is less than 0.001%, the effect of suppressing oxidation of silver contained in the light-receiving surface side electrode 31 is weak. In other words, the light-receiving surface side electrode 31 included in the photovoltaic element 3 preferably contains silver having a molar ratio of 75% or more and aluminum of 0.001% or more and 25% or less.

As the solar cell constituting the photovoltaic element 3, for example, a solar cell of a crystalline solar cell can be used. The crystalline solar cell unit is, for example, a single crystal solar cell or a polycrystalline halo cell. The crystalline solar cell unit is not limited to a single crystal germanium solar cell or a polycrystalline germanium solar cell.

The inner seal member 4 is composed of an olefin resin. Olefin resin For example, it is a polypropylene resin or a polyethylene resin. The inner sealing material 4 is preferably white. The inside of the sealing material 4 is preferably white, and most of the light that penetrates the light-transmitting substrate 1, the surface sealing material 2, and the photovoltaic element 3 and then reaches the inner sealing material 4 is not absorbed by the white inner sealing material 4. It is reflected by the white inner sealing material 4 and returned to the photovoltaic element 3. Therefore, most of the light penetrating the photovoltaic element 3 is not wasted and can be effectively utilized, and the power generation efficiency can be improved.

The back sheet 5 is a portion made of polyethylene terephthalate resin (PET), PET or aluminum foil vapor-deposited silica, or polyvinyl fluoride (PVF). Or a constituent film in which all of the plurality of films are laminated and integrated. In other words, the plurality of films are composed of polyethylene terephthalate resin, PET or aluminum foil vapor-deposited ruthenium oxide, or some or all of polyvinyl fluoride, and the design can be used alone. Or use them in combination. The backing plate 5 has a function of protecting the photovoltaic element 3 from moisture. Moreover, in order to prevent moisture from penetrating into the interior of the solar cell module, PET or aluminum foil which is vapor-deposited with cerium oxide is necessary. The surface to which the backing plate and the inner sealing material 4 are joined has high adhesion and is firmly adhered to the inner sealing material 4. Among the plurality of films constituting the back sheet 5, a film made of a resin having high weather resistance is preferable.

The solar cell module 10 of the first embodiment has the surface sealing material 2 and the inner sealing material 4 which are made of an olefin resin which does not generate an acid, and the back sheet 5 which is firmly adhered to the inner sealing material 4, even if the sun is not used. The reducing agent used in the sealing material of the battery module can ensure the reliability of the solar cell module 10 for a long period of time, and it is not necessary to use a reducing agent, so that it can be manufactured at low cost. In the solar cell module 10, the photovoltaic element 3 has a light-receiving surface side electrode 31 containing silver having a molar ratio of 75% or more and 0.001% or more and 25% or less of aluminum, thereby ensuring light reception. The conductivity of silver of the surface side electrode 31 can suppress oxidation of silver. Therefore, the reliability of the solar cell module 10 can be ensured for a long period of time, and at the same time, the amount of expensive silver can be suppressed, so that it can be manufactured at low cost.

The back side electrode 32 of the photovoltaic element 3 of the first embodiment is preferably an electrode having a molar ratio of 75% or more and 0.001% or more and 25% or less of aluminum, but it is not necessarily used. Further, the inner seal member 4 is preferably an olefin resin, but it is not necessarily non-olefin resin. For example, the inner seal member 4 may be an ethylene vinyl acetate copolymer. Although the cause of silver oxidation is acetic acid, it needs to be added by light, water and heat. Even if there is an ethylene vinyl acetate copolymer which is easy to produce acetic acid on the inner side, ultraviolet light is not easily incident on the inside of the photovoltaic element 3. Therefore, acetic acid is not generated, and oxidation of silver is not easily caused.

Next, a method of manufacturing the solar battery module 10 of the first embodiment will be described. First, as shown in Fig. 1, a light-transmitting substrate 1, a surface sealing material 2, a photovoltaic element 3, an inner sealing material 4, and a backing plate 5 are laminated in this order, thereby forming a laminated structure 10S. Next, the laminated structure 10S is heated, and the heated laminated structure 10S is pressurized to perform a laminated pressurization step. Thereafter, the laminated structure 10S is cooled and hardened to form the solar battery module 10 as shown in Fig. 1 .

Fig. 2 is a schematic view showing a cross section of a layering apparatus used in the method of manufacturing the solar battery module 10 of the first embodiment. The laminating device has a process chamber 101, a chamber vacuum pump 102. The operation cabin 101 has a heater 101H for heating the laminated structure 10S, a hot plate 101g for heating the laminated structure 10S, a first cabin 101a located below, and a second cabin having a pressurized function and located above. 101b; a transporting plate 101c for transporting the laminated structure 10S to the downstream side of the manufacturing process.

Fig. 3 is a side view showing the cooling conveyor belt 103 used in the method of manufacturing the solar battery module 10 of the first embodiment. The cooling conveyor belt 103 is disposed on the downstream side of the laminating apparatus as shown in Fig. 2, and after the pressure is applied to the laminating apparatus, the laminated structure 10S that has exited from the operating compartment 101 is cooled. The cooling conveyor belt 103 has a transport conveyor belt 131 and a plurality of rollers 132. The cooling conveyor belt 103 can also be composed of a transport plate and a chain.

The laminating apparatus shown in Fig. 2 performs a lamination pressurization step, however, the laminating pressurization step is roughly divided into two methods. The first method includes: integrating the light-transmitting substrate 1, the surface sealing material 2, the photovoltaic element 3, the inner sealing material 4, and the backing plate 5 by heating and pressurizing, thereby forming a lamination step of the laminated structure 10S; The formed laminated structure 10S is placed in a curing furnace (not shown), that is, an oven to heat the cross-linking step of crosslinking the surface sealing material 2 and the inner sealing material 4. In the second method, when the light-transmitting substrate 1, the surface sealing material 2, the photovoltaic element 3, the inner sealing material 4, and the backing plate 5 are heated and pressurized to be integrated, and a laminated step of forming the laminated structure 10S is performed, A method of continuously heating the surface sealing material 2 and the inner sealing material 4 to crosslink the surface sealing material 2 and the inner sealing material 4.

Fig. 4 is a schematic view showing the relationship between the heating time and the temperature of the sealing material in the laminating step in which the lamination step of the lamination step and the crosslinking step is performed, respectively. Fig. 5 is a view showing the relationship between the heating time and the temperature of the sealing material in the crosslinking step of the lamination step of the lamination step and the crosslinking step, respectively. Fig. 6 is a view showing the relationship between the heating time and the temperature of the sealing material in the lamination pressurization step of the lamination step and the cross-linking step. Figures 4 and 5 correspond to the first method, and Figure 6 corresponds to the second method.

In general, a sealing material composed of an olefin resin is more The sealing material composed of the vinyl acetate copolymer resin has higher elasticity, and temperature control during the lamination pressurization step is quite important. In order to suppress breakage of the photovoltaic element 3 (referred to as cell rupture) and generation of bubbles in the sealing material, the laminated pressurization step is performed at a temperature higher than a temperature lower than the melting point of the surface sealing material 2 and the inner sealing material 4 by 20 ° C.

Pressurization in a temperature range of not less than 20 ° C of the melting point of the surface sealing material 2 and the inner sealing material 4 and below the melting point of the surface sealing material 2 and the inner sealing material 4 can suppress sealing from the surface sealing material 2 and the inside. The generation of gas of the material 4 obtains the solar cell module 10 having a good appearance and can reduce the energy consumption. When the temperature of the surface sealing material 2 and the inner sealing material 4 is less than 20 ° C, the air bubbles in the surface sealing material 2 and the inner sealing material 4 enter, and the solar cell module 10 is resistant to moisture and reliability. And the possibility that the appearance quality is low is high. In addition, cell breakage during pressurization also increases significantly.

In addition, in the photovoltaic module 3 of the solar cell module 10, the electrodes of the plurality of photovoltaic elements 3 are electrically connected by solder. When a solder of a Sn-Ag-Cu-based alloy having a melting point of 219 ° C or a Pb-Sn-based solder having a melting point of 183 ° C is used, the solder diffuses to the solar cell module 10 when heated for a long period of time in the lamination pressurization step. The whole is the main cause of the low output of the solar battery module 10.

Therefore, the build-up pressurization step must be performed at a temperature below the melting point of the solder used for connecting the electrodes of the photovoltaic element 3. The lamination pressurization step is preferably performed at a temperature below the melting point of the surface seal member 2 and the inner seal member 4.

As described above, in the method of manufacturing the solar cell module 10 of the first embodiment, the laminated pressurization step is performed at a temperature lower than a temperature at which the surface sealing material 2 and the inner sealing material 4 have a melting point of 20 ° C or higher, and the photovoltaic element 3 is connected to the electrode. Solder melting The temperature below the point is made. It is preferable that the step of laminating pressurization is performed at a temperature equal to or lower than the melting point of the surface sealing material 2 and the inner sealing material 4. Thereby, it is possible to suppress the occurrence of air bubbles in the surface sealing material 2 and the inner sealing material 4, and the cell cracking increases during pressurization, and the solder diffuses to the entire solar cell module 10, thereby maintaining the high output of the solar cell module 10. And can prevent the appearance quality from falling. Further, in the manufacture of the solar cell module 10, the surface reducing material 2 and the inner sealing material 4 composed of an olefin-based resin which does not generate an acid are used, and the photovoltaic element 3 is contained. The light-receiving surface side electrode 31 of 75% or more of silver and 0.001% or more and 25% or less of aluminum can manufacture the highly reliable solar cell module 10 at low cost.

In the solar battery module 10 of the first embodiment, when the inner seal member 4 is white, most of the light reaching the inner seal member 4 is returned to the photovoltaic element 3. Therefore, most of the light penetrating the photovoltaic element 3 is not wasted. use efficiently. Thereby, the power generation efficiency of the solar cell module 10 is improved.

(Example)

Hereinafter, the embodiments will be described.

[Comparative Example 1]

A light-transmitting substrate 1 of a white plate glass having a size of 250 mm × 250 mm × 3.2 mm was prepared. A surface sealing material 2 composed of an ethylene vinyl acetate copolymer is used, and a silver electrode containing no aluminum in the light-receiving surface side electrode 31 of the photovoltaic element 3 and a silver electrode containing no aluminum in the inner side electrode 32 are used, and the photovoltaic element 3 is connected. The solder of the electrode used was a solder of a Pb-Sn alloy (melting point: 183 ° C), and an inner seal 4 made of a white ethylene vinyl acetate copolymer was used. The back sheet 5 is a sheet obtained by laminating a plurality of films comprising a polyethylene terephthalate resin and a film of PET and PVF deposited with cerium oxide, and is cut into a size of 270 mm × 270 mm.

Then, the light-transmitting substrate 1, the surface sealing material 2, the photovoltaic element 3, the inner sealing material 4, and the back sheet 5 were laminated, and vacuum suction was performed at a hot plate temperature of 160 ° C for 5 minutes using a laminating apparatus as shown in Fig. 2 . The pressure at the time of pressurization was 50 kPa and the pressurization time was 5 minutes. Thereby, the temperature of the surface sealing material 2 and the inner surface sealing material 4 was 78 degreeC, and it pressurized.

The laminated structure 10S in which the lamination step was carried out was held in an annealing furnace at 150 ° C for 30 minutes to carry out a crosslinking step.

Example 1

The surface sealing material 2 made of a transparent polyethylene resin having a melting point of 95 ° C is used, and the light-receiving surface side electrode 31 of the photovoltaic element 3 is an electrode including a molar ratio of 99.5% of silver and 0.5% of aluminum, and the inner side electrode 32. An electrode comprising a silver having a molar ratio of 99.5% and 0.5% of aluminum was used, and a white polyethylene resin having a melting point of 95 ° C was used as the inner sealing material 4, and in the same manner as in Comparative Example 1, polyethylene terephthalate was used. A plurality of films made of PET and PVF in which a resin is vapor-deposited, and a back sheet 5 integrated by lamination. In the same manner as in Comparative Example 1, the laminate pressurization step was carried out at 78 ° C which was lower than the temperature of the surface sealing material 2 and the inner seal member 4 by 20 ° C, and the cross-linking step after pressurization was below the melting point of the solder. This was carried out by maintaining it in an annealing furnace at 150 ° C for 30 minutes. The rest were the same as in Comparative Example 1.

Example 2

As the inner seal member 4, an ethylene vinyl acetate copolymer resin having a melting point of 72 ° C was used, and the rest was the same as in the first embodiment.

Example 3

The light-receiving surface side electrode 31 of the photovoltaic element 3 uses an electrode including a molar ratio of 75% silver and 25% aluminum, and the inner side electrode 32 uses a molar ratio. 75% silver with 25% aluminum electrode. The rest is the same as in Embodiment 2.

Example 4

The light-receiving surface side electrode 31 of the photovoltaic element 3 uses an electrode including a molar ratio of 99.999% of silver and 0.001% of aluminum, and the inner side electrode 32 uses an electrode containing a molar ratio of 99.999% of silver and 0.001% of aluminum. The rest is the same as in Embodiment 2.

Table 1 shows the aspects of Comparative Example 1 and Examples 1 to 4.

The solar cell module of Comparative Example 1 and the solar cell modules of Examples 1 to 4 were subjected to a deterioration acceleration test in an environment where the temperature was 85 ° C and the humidity was 85% and the temperature was high and high humidity. Fig. 7 is a schematic view showing the results of performing the above-described deterioration acceleration test. The Pm deterioration rate (%) in Fig. 7 means the deterioration rate of the maximum output.

As is clear from Fig. 7, the photovoltaic element 3 has an electrode containing silver and aluminum, and the surface sealing material 2 is made of a polyethylene resin of an olefin resin, and is lower than the surface sealing material 2 and the inner sealing material 4. The temperature is higher than the temperature of 20 ° C, and the temperature after pressurization is encapsulated in a range of not more than the melting point of the solder, and the solar cell module 10 which is excellent in reliability even after a long period of time can be manufactured. Further, even if the inner sealing material 4 is made of an ethylene vinyl acetate copolymer resin, long-term reliability is not greatly affected. Further, in the range of the light-receiving surface side electrode 31 of the photovoltaic element 3 in the range of silver containing 75% or more of the molar ratio and aluminum of 0.001% or more and 25% or less, the long-term reliability is not greatly affected.

Fig. 8 is a view showing the relationship between the temperature of the sealing material composed of the ethylene vinyl acetate copolymer and the probability of cell breakage in the solar cell module when the laminated device is used to apply pressure to the solar cell module. Fig. 9 is a view showing the relationship between the temperature of the sealing material composed of polyethylene and the probability of breakage of the unit in the solar cell module when the laminated device is pressed against the solar cell module. As shown in Fig. 8 and Fig. 9, it is understood that the laminated unit pressurization is performed at a temperature lower than the temperature at which the surface sealing material 2 and the inner sealing material 4 have a melting point of 20 ° C or higher, so that the unit cell of the solar cell module 10 is broken. Reduced, productivity becomes very high. Therefore, the build-up pressurization step is performed at a temperature higher than the temperature at which the melting point of the surface seal member 2 and the inner seal member 4 is lower by 20 °C.

The configuration shown in the above embodiments is merely an example of the contents of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or changed within the scope of the gist of the invention.

Claims (7)

A solar cell module comprising: a light transmissive substrate through which light is transmitted; a position on a side of the light transmissive substrate that is incident on the light transmissive substrate, and an olefin resin The surface sealing material comprising the surface sealing material on the side opposite to the side on which the light-transmitting substrate is located, and the component having the glass component excluded from the component constituting the electrode includes silver having a molar ratio of more than 91.85% a photovoltaic element having a light-receiving surface side electrode of 0.001% or more and less than 8.15%; an inner sealing material located on a side opposite to a side of the surface sealing material based on the photovoltaic element; and the inner sealing material as a reference The backing plate is located on the side opposite to the side on which the photovoltaic element is located. The solar battery module according to the first aspect of the invention, wherein the olefin resin is a polypropylene resin or a polyethylene resin. The solar cell module according to claim 1, wherein the inner seal member is an olefin resin or an ethylene vinyl acetate copolymer. The solar cell module according to claim 1, wherein the backing plate is made of polyethylene terephthalate resin, polyethylene terephthalate or aluminum foil vapor-deposited with cerium oxide, and polyfluoride. A plurality of films composed of part or all of ethylene or the like are laminated and integrated. A method of manufacturing a solar cell module, comprising the steps of: entering a light penetrating base outside the light transmissive light transmissive substrate a step of laminating a surface sealing material composed of an olefin resin and a surface sealing material in which the light-transmitting substrate and the surface sealing material are laminated, on the one side of the plate; a photovoltaic element having a light-receiving surface side electrode containing silver having a molar ratio of more than 91.85% and 0.001% or more and less than 8.15% of aluminum is disposed on the side opposite to the side of the light-transmitting substrate. a step of laminating a surface sealing material with a photovoltaic element laminated with the above photovoltaic element; and arranging an olefin resin or an inner seal composed of an ethylene vinyl acetate copolymer on the side opposite to the side of the surface sealing material based on the photovoltaic element a step of laminating the inner sealing material in which the photovoltaic element and the inner sealing material are laminated; and the polyethylene terephthalate resin is disposed on the opposite side of the side of the photovoltaic element based on the inner sealing material; a plurality of films composed of partially or wholly of polyethylene terephthalate or aluminum foil or polyvinyl fluoride vapor-deposited with cerium oxide are laminated a backing plate, a backing layer laminating step of laminating the inner sealing material and the backing plate; and the laminated light-transmitting substrate, the surface sealing material, the photovoltaic element, the inner sealing material, and a laminating pressurization step of laminating and simultaneously pressing the backing plate; the laminating pressurizing step is lower than a temperature of 20 ° C or higher of a melting point of the surface sealing material and the inner sealing material, and the connecting electrode of the photovoltaic element is The temperature below the melting point of the solder used is applied. The method for producing a solar cell module according to the fifth aspect of the invention, wherein the olefin-based resin is a polypropylene resin or a polyethylene resin. The method for manufacturing a solar cell module according to the fifth or sixth aspect of the invention, wherein the step of laminating pressurization is lower than a temperature of 20 ° C or higher of a melting point of the surface sealing material and the inner sealing material, and the surface sealing material is And the temperature below the melting point of the inner sealing material is applied.