JP2016146368A - Solar cell module of back contact type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module of back contact type in which a back sheet is free from embrittlement, and the production cost is reduced by reducing a material used in an insulation layer.SOLUTION: In a solar cell module 50 of back contact type constituted by laminating at least a transparent base material 1, a transparent sealing material 2, a solar cell 3, a sealing material 4, and a back sheet 7 with a circuit in this order, the back sheet 7 with a circuit consists of a laminate laminating a colored insulation layer 11 mixed with a pigment having UV resistance, circuits 20 formed by patterning a metal layer, and a wiring part 21 connecting between the circuits, and a back sheet 6. The colored insulation layer 11 is formed in a non-wiring part 41 on the outer peripheral edge 40 of the back sheet with a circuit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a back contact type solar cell module. In particular, the present invention relates to a backsheet with a circuit constituting a solar cell module.

  In recent years, solar power generation, which is a power generation system using natural energy, has been rapidly spread. In a solar battery module for photovoltaic power generation, a plurality of solar battery cells are arranged adjacent to each other, and each solar battery cell is electrically connected to take out electric power. Since the wiring for electrically connecting such solar cells is exposed to the light receiving surface side, the light receiving area is reduced, so a connection electrode is formed on the surface opposite to the light receiving surface of the solar cells. And the back contact type connection structure which connected this connection electrode on the circuit sheet via the connection material is employ | adopted. As the connecting material, for example, solder or silver paste is used. The circuit sheet used for such a back contact type solar cell module has an insulating layer that prevents the connection material from moving into adjacent circuits and prevents the connection material from moving into the adjacent circuit during wiring. Is provided.

  For example, FIG. 3A illustrates an example of a layer configuration of a general back contact type solar cell module 70. In order from the light receiving side (surface), the transparent base material 1, the transparent sealing material 2, the solar battery cell (back contact cell) 3, the sealing material 4, the insulating layer 10, the circuit sheet 5, and the back sheet 6 were laminated in this order. It is a solar cell module 70, and the connection electrode 8 on the back surface of the solar cell 3 and the circuit 20 on which the metal layer is patterned are electrically connected with the solder or silver paste of the connection material 9 to extract electric power. ing. The circuit sheet 5 is formed by bonding a metal layer and a sheet base material via an adhesive layer 12, and a wiring layer 21 that connects the circuit 20 and the circuit by patterning the metal layer is formed. A back sheet 6 is laminated on the back surface of the circuit sheet 5 with an adhesive layer 12 interposed therebetween.

  Recently, development for reducing the production cost of this type of solar cell module has been advanced. For example, a backsheet 7 with a circuit in which a circuit sheet 5 and a backsheet 6 are integrated as shown in FIG. 3-2 has been developed. For example, a metal layer such as a copper foil or an aluminum foil is bonded to a polyethylene terephthalate film or a polyethylene terephthalate film as the back sheet 6 via an adhesive layer, and the metal layer is patterned to connect between the circuit 20 and the circuit. A backsheet 7 with a circuit in which the wiring portion 21 is formed has been developed. The insulating layer 10 is formed except for a portion where the connection electrode 8 and the circuit 20 are connected by the connection material 9. FIG. 3C shows a back contact type solar cell module 80 reinforced with an aluminum frame 24. A plurality of connected solar cells 3 are connected to the terminal box 23 on the outer side of the solar cell module 80 with lead wires 22 connected to take out the generated electric power. The insulating layer 10 is formed except for a portion where the connection electrode 8 and the circuit 20 are connected by the connection material 9.

  The insulating layer 10 is made of a material called a solder resist, and since this material is expensive, the production cost of the solar cell module is high. It is desired to use as few materials as possible. Furthermore, the formation of the insulating layer requires a post-printing thermal curing or ultraviolet curing step, and in particular, the thermal curing usually takes 10 to 60 minutes at 100 to 160 ° C. In general, in order to form with a thickness of 20 to 30 μm, a method of forming by screen printing and curing by heat treatment or ultraviolet irradiation is used. Since the production cost is high due to the high cost of the insulating layer and the low productivity of screen printing, the amount of solder resist used is reduced, or the solder resist is omitted and the sealing material 4 is insulated. What has been developed has been developed.

  In addition, since the solder resist is colored, ultraviolet rays are absorbed by the solder resist, and it has the effect of preventing embrittlement of the backsheet, for example, polyethylene terephthalate film. Providing the insulating function can reduce the production cost, but on the other hand, the problem of embrittlement of the polyethylene terephthalate film occurs.

  There is also an idea that a colorant that cuts ultraviolet rays, for example, a black pigment such as a carbon blank, or a white pigment such as titanium oxide or barium sulfate, is included in the encapsulant 4, but these pigments are encapsulated, for example, ethylene- There is a risk of moving in the vinyl acetate copolymer (EVA) resin (migration) and further moving to the transparent sealing material on the light receiving surface side to prevent light reception and reduce power generation efficiency.

  Further, the back sheet is required to have excellent mechanical properties and various properties such as weather resistance, heat resistance, moisture resistance and water decomposition resistance. As such a back sheet, it is desirable that it has a weather resistance that can withstand long-term use, that is, it can withstand outdoor exposure for a useful life (approximately 20 years), such as a fluororesin film or a polyethylene terephthalate film having weather resistance. Etc.

  However, the fluorine-based resin film has weather resistance but has a problem of high material cost. On the other hand, polyethylene terephthalate film is relatively inexpensive, but heat resistance and weather resistance are not sufficient. In particular, there is a high demand for improvement in weather resistance.

  There is a proposal for imparting weather resistance to a polyethylene terephthalate film. For example, a proposal containing an ultraviolet absorber in a polyethylene terephthalate film (Patent Document 1), a proposal for reducing ultraviolet transmittance using a white polyethylene terephthalate film containing titanium dioxide (Patent Document 2), and an ultraviolet absorber There is a proposal (Patent Document 3) in which a water vapor barrier layer is provided on the surface of a polyethylene terephthalate film.

  However, a polyethylene terephthalate film containing an ultraviolet absorber has problems such as an increase in production cost and a decrease in adhesion to the metal layer. Moreover, the thing containing titanium dioxide has the problem that production cost becomes high similarly. In addition, in the case where a water vapor barrier layer is provided on the surface of a film containing an ultraviolet absorber, there is a concern that the adhesiveness to the water vapor barrier layer is lowered due to the migration of the ultraviolet absorber.

  In view of the above, there is a demand for a back contact type solar cell module that reduces production costs and does not cause embrittlement of the back sheet.

JP 2009-188105 A JP 2006-270025 A JP 2006-261189 A

  The present invention has been made to solve the above-mentioned problems, and provides a back contact type solar cell module that reduces the material used for the insulating layer, reduces the production cost, and does not cause the back sheet to become brittle. There is.

The invention according to claim 1 of the present invention is a back contact type solar cell module,
At least, a transparent base material, a transparent sealing material, a solar battery cell, a sealing material, and a backsheet with a circuit are laminated in this order,
The backsheet with circuit was laminated with a colored insulating layer in which a pigment having an ultraviolet-cutting property was blended, a circuit in which a metal layer was patterned, a wiring portion connecting the circuits, and a backsheet. Consisting of laminates,
The back contact type solar cell module, wherein the colored insulating layer is formed on a non-wiring portion on an outer peripheral edge of the backsheet with circuit.

  In the invention according to claim 2 of the present invention, the colored insulating layer is blended with a black pigment made of carbon black or titanium black, and the blending ratio of the black pigment is 1 to 4 by weight with respect to the colored insulating layer. The back contact type solar cell module according to claim 1, wherein the back contact type solar cell module is wt%.

  In the invention according to claim 3 of the present invention, the colored insulating layer is blended with a white pigment made of titanium oxide or barium sulfate, and the blending ratio of the white pigment is 5 to 15 by weight with respect to the colored insulating layer. The back contact type solar cell module according to claim 1, wherein the back contact type solar cell module is wt%.

  The invention according to claim 4 of the present invention is the back contact type solar cell module according to any one of claims 1 to 3, wherein the back sheet is made of a polyethylene terephthalate film.

  The solar cell module of the present invention can prevent embrittlement of the backsheet due to ultraviolet rays by forming the colored insulating layer of the backsheet with circuit on the non-wiring portion on the outer peripheral edge of the backsheet. In addition, since the insulating resin used for the insulating layer can be reduced, the production cost can be reduced.

  According to claim 1 of the present invention, the backsheet with circuit is a colored insulating layer in which a pigment having an ultraviolet ray-cutting property is blended, a circuit in which a metal layer is patterned, and a wiring part that connects between the circuits, The backsheet and the laminated body are laminated, and the colored insulating layer is formed on the non-wiring portion on the outer peripheral edge of the backsheet to prevent embrittlement of the non-wiring portion on the outer peripheral edge of the backsheet. Can do. Since there is a metal layer in the wiring part connecting the circuits on the back sheet and between the circuits, ultraviolet rays are cut and the back sheet does not become brittle, so a colored insulating layer is formed on the non-wiring part on the outer periphery By doing so, embrittlement of the back sheet can be prevented.

  Further, by forming the colored insulating layer only on the non-wiring portion on the outer peripheral edge of the back sheet, the insulating resin used for the insulating layer can be reduced, and the production cost can be reduced.

  According to claim 2 of the present invention, the colored insulating layer is blended with a black pigment made of carbon black or titanium black, and the blending ratio of the black pigment is 1 to 4% by weight with respect to the colored insulating layer. Therefore, it is possible to efficiently absorb and cut ultraviolet rays.

  According to claim 3 of the present invention, the colored insulating layer is blended with a white pigment made of titanium oxide or barium sulfate, and the blending ratio of the white pigment is 5 to 15% by weight with respect to the colored insulating layer. Therefore, it is possible to efficiently reflect and cut ultraviolet rays.

  According to claim 4 of the present invention, since the back sheet is made of a polyethylene terephthalate film, it is a relatively inexpensive material, and the production cost can be reduced.

It is explanatory drawing which shows an example of the laminated constitution of the back contact type solar cell module of this invention. It is explanatory drawing which shows an example of the layer structure of the outer periphery part of a backsheet with a circuit. It is explanatory drawing which shows an example of the laminated constitution of a general solar cell module.

  Hereinafter, embodiments for carrying out the present invention will be described.

  FIG. 1 is an explanatory diagram showing an example of a layer configuration of a back contact type solar cell module of the present invention. FIG. 1-1 is an explanatory diagram illustrating an example of a layer configuration of the solar cell module 50. The solar cell module 50 includes a transparent substrate 1 such as a front glass, a transparent encapsulant 2, a solar cell 3, an encapsulant 4, and a backsheet 7 with a circuit. On the back surface of the solar battery cell 3, a connection electrode 8 that is an electrode for extracting electrons is provided, and a connection material 9 that connects the circuit 20 and the connection electrode 8 is formed. A plurality of solar cells 3 are formed, and each circuit 20 is connected by a wiring portion 21.

  As the connecting material 9, a conductive material such as solder or silver paste is generally used. The backsheet with circuit 7 is composed of a laminate in which a metal layer and the backsheet 6 are bonded together through an adhesive layer 12, and a wiring portion 21 that connects the circuit 20 and the circuit by patterning the metal layer is provided. Is formed. Further, the sealing material 4 is interposed and insulated except for the portion where the connection electrode 8 and the circuit 20 are connected by the connection material 9. A transparent sealing material 2 is also interposed between the transparent substrate 1 and the solar battery cell 3.

  In the solar cell module, in the portion where the metal layer such as the solar cell 3 and the circuit 20 and the wiring portion 21 connecting the circuits is formed, the ultraviolet rays A are easily reflected by the metal layer, and the backsheet becomes brittle. It is difficult. However, the non-wiring portion 41 on the outer peripheral edge 40 of the backsheet, that is, the portion where the metal layer is not formed, is irradiated with ultraviolet rays A, and the backsheet 6 is easily embrittled. Therefore, by forming the colored insulating layer 11 only in the non-wiring portion 41 of the outer peripheral edge 40 of the backsheet, that is, the portion where the metal layer is not formed, the embrittlement of the portion is prevented and the entire backsheet 6 is formed. Embrittlement can be prevented.

  FIG. 1-2 illustrates an example of a back contact type solar cell module 60 reinforced with an aluminum frame. The solar cell module has shown an example of the state reinforced with the aluminum frame 24 by which the alumite process was carried out. The generated electric power is connected to the terminal box 23 on the outer side of the back sheet 6 by a lead wire 22.

  For example, the ultraviolet ray A is cut because there is a metal layer in the circuit 20 and the wiring part 21 for wiring between the circuits, but the non-wiring part 41 on the outer peripheral edge 40 of the backsheet, that is, the aluminum frame 24, The non-wiring portion 41 between the wiring portion 21 and the circuit 20 is irradiated with ultraviolet rays A. Therefore, the colored insulating layer 11 is formed only on the non-wiring portion 41 to prevent the backsheet from becoming brittle. Can do.

  FIG. 2 is an explanatory diagram showing an example of the layer configuration of the outer peripheral edge of the backsheet with circuit. The colored insulating layer 11 is laminated on the non-wiring portion 41 of the outer peripheral edge 40 of the backsheet. Since the colored insulating layer 11 is laminated in a state where the pigments 30 that cut off ultraviolet rays are uniformly dispersed, the backsheet 6 can be prevented from becoming brittle.

  Furthermore, the form for implementing this invention is demonstrated in detail.

  The transparent substrate 1 has good light transmittance, excellent weather resistance over a long period of time (about 20 years), little decrease in light transmittance, resistance to dust, and extremely high water vapor transmission rate. It is necessary to have various functions such as low, and as a material, a film made of an acrylic resin, a polycarbonate resin, a silicone resin, a fluorine resin, or the like can be used in addition to glass. Moreover, these films can also be used as a composite film.

  As a transparent encapsulant, there is no change in physical properties such as high transmittance of sunlight, lowering of light transmittance, etc., high insulation, no corrosion of other materials, sudden changes in outside air conditions, etc. For example, polyvinyl butyral (PVB) resin, silicone resin, vinyl chloride resin, polyurethane resin, and the like can be used. An ethylene-methyl methacrylate copolymer (EMMA), an ethylene-acrylate copolymer (EAA), an ionomer, a polypropylene resin and the like can also be used, and an ethylene-vinyl acetate copolymer (EVA) resin can be preferably used. As thickness of a transparent sealing material, the range of 100-1000 micrometers is preferable. If it is less than 100 μm, the cell may be broken, and if it exceeds 1000 μm, it is not economical.

  As the sealing material, ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-acrylate copolymer (EAA), ionomer, polypropylene resin, polyvinyl butyral ( PVB) resin, silicone resin and the like can be used. In addition, a colored film such as white or black is used to make the gaps between solar cells invisible, or a highly reflective film for improving power generation efficiency by reflecting light that has not been absorbed by the solar cell surface again. A prism sheet can also be used.

  The sealing material can be formed by, for example, extruding a mixed resin obtained by mixing an ethylene-vinyl acetate copolymer (EVA) resin and other additives and heating and melting them using a T die. is there. For example, a sealing material can be formed by forming a film in two layers by a co-extrusion method. The thickness of the sealing material is preferably in the range of 50 μm to 2 mm. As another method, it is possible to form a sheet by calendering.

  Next, the colored insulating layer will be described in detail.

  A backsheet with a circuit is composed of a laminate in which a metal layer and a backsheet are laminated via an adhesive, and the metal layer is patterned to form a wiring portion that connects the circuits and between the circuits. A colored insulating layer is laminated and formed on the non-wiring portion on the outer peripheral edge of the sheet.

  The colored insulating layer is required to have high insulating properties. As the insulating resin for forming the colored insulating layer, a thermosetting resin, an ultraviolet curable resin, or the like can be used. As the thermosetting resin, for example, phenol resin, epoxy resin, unsaturated polyester resin, polyimide resin, polyester resin, fluorine resin, silicone resin, polycarbonate resin, polyether styrene resin, polyether imide resin and the like can be used.

  In order to heat-dry the thermosetting resin, it is necessary to confirm and heat the thermoset resin since it may cause shrinkage or deformation due to heat exceeding the Tg (glass transition temperature) of the backsheet.

  Further, as the ultraviolet curable resin, a radical polymerization type resin such as acrylate or unsaturated polyester or a cationic polymerization type such as an epoxy resin can be used.

  Since the ultraviolet curable resin is not accompanied by heat treatment when irradiated with ultraviolet rays, there is no problem of thermal shrinkage of the back sheet. Also, as a process, ultraviolet curing is shorter in curing time and more economical than thermal curing. By using the ultraviolet curable resin, the productivity of the back sheet can be increased. Furthermore, by forming the ultraviolet curable resin in the non-wiring portion on the outer peripheral edge of the backsheet, the productivity of the backsheet can be further improved and the production cost can be reduced.

  The colored insulating layer can be formed by forming a colored insulating agent in which a pigment having an ultraviolet-cutting property is blended in at least an insulating resin, and applying the colored insulating agent.

  Various pigments such as inorganic pigments and organic pigments can be used as the pigment. As the black pigment, carbon black, titanium black, and the like are preferable, and an average particle diameter of 0.01 to 0.5 μm is preferable from the viewpoint of color development, dispersibility, and cost. Further, as the white pigment, titanium oxide, barium sulfate, and the like are preferable. From the viewpoint of coloring, the average particle diameter of titanium oxide is preferably 0.1 to 1.0 μm.

  In addition, for example, in the case of a black pigment, the blending amount of the pigment is preferably in the range of 1 to 4% by weight with respect to the colored insulating layer. If it is less than 1% by weight, the UV-cutting property is poor, and when exposed to the outdoors for a long time, the backsheet may be deteriorated and yellowed. On the other hand, when the amount exceeds 4% by weight, the amount of the pigment is too large, which may adversely affect the curing of the ultraviolet curable resin, may shift to a sealing material, or may reduce the adhesion between the sealing material and the colored insulating layer. There is.

  In the case of a white pigment, the weight ratio to the colored insulating layer is preferably in the range of 5 to 15% by weight. If it is less than 5% by weight, the UV-cutting property is poor, and the backsheet may be deteriorated or yellowed when exposed to the outdoors for a long time. On the other hand, if it exceeds 15% by weight, there is too much pigment, which may adversely affect the curing of the ultraviolet curable resin, shift to a sealing material, or reduce the adhesion between the sealing material and the colored insulating layer. There is.

  The coloring insulating layer can be formed by a known method such as gravure printing, silk screen printing, or ink jet printing.

  The thickness of the colored insulating layer is preferably in the range of 5 to 25 μm in order to obtain a high insulation level. If the thickness is less than 5 μm, the insulating properties are insufficient, and if it exceeds 25 μm, no further effect can be obtained, which is uneconomical.

  Next, an example of a manufacturing method for creating a backsheet with circuit will be described.

  The backsheet with a circuit is composed of a laminate in which a metal layer and a backsheet are bonded via an adhesive layer, and the metal layer is patterned to form a wiring portion for connecting the circuits and the circuits. A colored insulating layer is laminated and formed on the non-wiring portion at the outer peripheral edge.

  As an adhesive for forming the adhesive layer, an adhesive for dry lamination can be used. For example, a two-component curable urethane adhesive, a polyester urethane adhesive, a polyether urethane adhesive, an acrylic adhesive, a polyester adhesive, a polyamide adhesive, and an epoxy adhesive can be used.

Examples of the diluent solvent for the adhesive include toluene, xylene, ethyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, tetrahydrofuran, dimethylformamide, dimethylacetamide, methanol, ethanol and water. The colored adhesive may be either an emulsion type or a solvent type.

  In order to form the adhesive layer, the above-described adhesive can be used, for example, by a known method such as gravure coating, roll coating, blade coating, or die coating. The thickness of the adhesive layer is preferably 5 to 15 μm, and the adhesive strength can be strengthened. When the thickness of the adhesive layer is less than 5 μm, the adhesive strength is insufficient, and when it exceeds 25 μm, the production cost is increased. The bonding method can be performed by a dry laminating method.

  It is also possible to extrude an adhesive resin and use an extrusion laminating method. This adhesive resin may be a resin such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene-methyl methacrylate copolymer (EMMA), ethylene-acrylate copolymer (EAA). Can be mentioned. The thickness of the adhesive layer is preferably in the range of 15 to 30 μm, and can be determined by the adhesive strength.

  As a metal layer, copper foil, aluminum foil, etc. are preferable from the surface of electroconductivity and material cost. As the patterning of the metal layer, etching or punching can be performed.

  The back sheet is a circuit sheet on which a circuit and a wiring portion for connecting the circuits are formed, and at the same time, it needs to have a function as a back surface protection of the solar cell module. It can be appropriately selected from polyethylene terephthalate film, polybutylene terephthalate (PBT), polyethylene naphthalate film, polyolefin film such as polypropylene and polyethylene, film such as polyphenylene sulfide (PPS), or polyvinyl fluoride (PVF). Moreover, although these films may be used by a single layer, they may be combined. For example, the layer structure of the back sheet includes fluororesin / polyethylene terephthalate film / fluororesin or polyethylene terephthalate film / fluororesin. If necessary, in order to impart gas barrier properties, that is, water vapor barrier properties, oxygen barrier properties, and the like, those obtained by laminating an aluminum foil on these films, or those obtained by depositing inorganic oxides can be used. Moreover, what colored the white sheet or the black sheet from the viewpoint of design property may be used.

  Next, an example of a method for manufacturing a back contact type solar cell module will be described.

  The solar cell module is formed by, for example, laminating a transparent encapsulant, a solar cell, an encapsulant, and a backsheet with a circuit in this order on a transparent base material such as a front glass, and then thermocompression bonding with vacuum suction. It can be integrally formed by a normal molding method such as laminating. Under the present circumstances, the connection electrode which is an electrode for electron extraction is provided in the back surface of the photovoltaic cell, and the connection material is connected so that it may connect with the circuit of a back seat | sheet, and is integrally molded. A plurality of solar cells are formed, and each circuit is connected by a wiring portion. The wiring part is connected to a terminal box on the outside of the back sheet by a lead wire.

  The back contact type solar cell module of the present invention can prevent embrittlement of the back sheet by forming the colored insulating layer only on the non-wiring portion on the outer peripheral edge of the back sheet with circuit. In addition, it is possible to reduce the amount of insulating resin used for the insulating layer, and to reduce the production cost.

  Specific examples of the present invention will be described below.

A 25 μm-thick polyvinyl fluoride (PVF) resin film (trade name, PV2111, manufactured by DuPont Co., Ltd.) and a 250 μm-thick polyethylene terephthalate film (trade name, S-10, manufactured by Toray Industries, Inc.) The laminate was formed by bonding by a dry laminating method using a liquid curing type urethane adhesive.

Next, using a two-component curable urethane adhesive, an electrolytic copper foil having a thickness of 35 μm was bonded to the polyethylene terephthalate film surface of the laminate by a dry lamination method. Thereafter, aging was performed at 60 ° C. for 7 days. The thickness of the adhesive was 12 g / m ² (dry). The adhesive strength between the polyethylene terephthalate film and the electrolytic copper foil was 10 N / cm.

  Furthermore, the electrolytic copper foil was patterned by an etching method, and a back sheet on which a wiring part connecting the circuit and the circuit including the wiring part and the non-wiring part was formed was created.

Next, in order to form a colored insulating layer, carbon black is blended in an ultraviolet curable resin (trade name, UVR-150GR60, manufactured by Taiyo Ink Manufacturing Co., Ltd.), and the blending ratio of the carbon black is colored insulating. A colored insulating agent is formed so that the weight ratio to the layer is 3% by weight, and the colored insulating agent is used to form a non-wiring portion on the outer peripheral edge of the back sheet by silk screen printing. A backsheet was created. The colored insulating layer was cured by ultraviolet treatment at 1000 mj / cm ² . The thickness of the colored insulating layer was 20 μm.

  Next, 200 μm of an ethylene-vinyl acetate copolymer (EVA) resin film (not including an ultraviolet absorber) as a sealing material is prepared, and holes are formed in the connection electrode and the circuit portion on the back surface of the solar battery cell. A back contact type solar cell module was prepared by stacking the attached back sheets and further laminating the solar cells, transparent sealing material 400 μm, and front glass in order. When superimposing, silver paste was applied to the contact portion between the connection electrode and the circuit, and bonding was performed by heating the module laminate. As the front glass, tempered soda glass having a thickness of 3 mm was used. As the transparent sealing material, an EVA resin film (not including an ultraviolet absorber) was used. The module lamination was conducted under vacuum at 130 ° C. for 3 minutes and further at 150 ° C. for 30 minutes.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
A back contact type solar cell module was produced in the same manner as in Example 1 except that the colored insulating layer of Example 1 was not formed.

<Comparative example 2>
A back contact type solar cell module was produced in the same manner as in Example 1 except that the colored insulating layer of Example 1 was used and formed on the entire surface of the back sheet. The thickness of the colored insulating layer was 20 μm.

<Evaluation method>
An ultraviolet irradiation test was performed from the front glass side of the back contact type solar cell module thus created. As ultraviolet irradiation conditions, light with an illuminance of 60 W was irradiated for 1000 hours at a wavelength of 300 to 400 nm. After the test, the presence or absence of embrittlement of the polyethylene terephthalate film was confirmed. As evaluation methods, tensile breaking strength and adhesive strength were evaluated.

<Evaluation results>
Shown in Table 1

実施例１のバックシートでは、外周縁の非配線部を含めてポリエチレンテレフタレートフィルムの脆化は観られなかった。比較例２も同様に脆化は観られなかった。また比較例１では、外周縁の非配線部およびバックシート全体で脆化が観られた。着色絶縁層との接着も低下していた。また、着色絶縁層を、回路付きバックシートの外周縁の非配線部に形成したことにより、絶縁層に使用する絶縁樹脂を少なくすることができ、生産コストを低減できることが判った。

In the back sheet of Example 1, no embrittlement of the polyethylene terephthalate film including the non-wiring portion on the outer peripheral edge was observed. Similarly in Comparative Example 2, no embrittlement was observed. Further, in Comparative Example 1, embrittlement was observed in the non-wiring portion on the outer peripheral edge and the entire back sheet. Adhesion with the colored insulating layer was also reduced. Further, it was found that by forming the colored insulating layer on the non-wiring portion on the outer peripheral edge of the backsheet with circuit, the insulating resin used for the insulating layer can be reduced and the production cost can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Transparent base material 2 ... Transparent sealing material 3 ... Solar cell 4 ... Sealing material 5 ... Circuit sheet 6 ... Back sheet 7 ... Back sheet 8 with a circuit ... Connecting electrode 9 ... Connecting material 10 ... Insulating layer 11 ... Colored insulating layer 12 ... Adhesive layer 20 ... Circuit 21 ... Wiring part 22 ... Lead wire 23 ... Terminal box 24 ... Aluminum Frame 30 ·· Pigment 40 · · Outer peripheral edge 41 · · Non-wiring portion 50 · · Back contact solar cell module 60 of the present invention · · Back contact solar cell module of the present invention (with aluminum frame)
70 .. General back contact solar cell module 80 .. General back contact solar cell module (with aluminum frame)
A ... UV

Claims (4)

Back contact type solar cell module,
At least, a transparent base material, a transparent sealing material, a solar battery cell, a sealing material, and a backsheet with a circuit are laminated in this order,
The backsheet with a circuit was laminated with a colored insulating layer in which a pigment having UV-cutting properties was blended, a circuit in which a metal layer was patterned, a wiring portion connecting the circuits, and a backsheet. Consisting of laminates,
The back contact type solar cell module, wherein the colored insulating layer is formed on a non-wiring portion on an outer peripheral edge of the backsheet with circuit.   The colored insulating layer is blended with a black pigment made of carbon black or titanium black, and the blending ratio of the black pigment is 1 to 4% by weight with respect to the colored insulating layer. The back contact type solar cell module according to 1.   The colored insulating layer is blended with a white pigment made of titanium oxide or barium sulfate, and the blending ratio of the white pigment is 5 to 15% by weight with respect to the colored insulating layer. The back contact type solar cell module according to 1.   The back contact type solar cell module according to any one of claims 1 to 3, wherein the back sheet is made of a polyethylene terephthalate film.

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