JP2014082337A - Solar cell module, solar cell protective sheet, and method of manufacturing solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell protective sheet which allows a solar cell module to be easily and surely manufactured, and a method of manufacturing a solar cell module.SOLUTION: The solar cell protective sheet includes a sheet body 5 and an adhesive layer 8 laminated on one surface of the sheet body 5. The method of manufacturing a solar cell module includes the steps of: laminating a solar cell 2 on the adhesive layer 8 of the solar cell protective sheet; laminating another solar cell protective sheet on the solar cell 2; and pressurizing a laminate of the pair of solar cell protective sheets and the solar cell 2 from the front and rear sides. It is preferable that one of the solar cell protective sheets has flexibility.

Description

  The present invention relates to a solar cell module, a solar cell protection sheet, and a method for manufacturing a solar cell module.

  Generally, a solar cell module includes a solar cell, a filler layer surrounding the solar cell, a permeable substrate disposed on the surface side of the filler layer, and a back surface side of the filler layer. And a back sheet to be disposed. As a method for producing this solar cell, a light-transmitting substrate, a sealing material sheet made of a thermoplastic resin constituting the surface side of the filler layer, a solar cell, a thermoplastic resin constituting the back surface side of the filler layer A manufactured sealing material sheet and a back sheet are laminated in this order, and the laminate is heated in a vacuum state and pressurized from the front and back surfaces.

  As the sealing material sheet, a sheet made of ethylene vinyl acetate resin is used (see JP 2012-33571 A, etc.). Such a sealing material made of ethylene vinyl acetate resin is melted by heating and then cooled, whereby the pair of sealing materials are solidified integrally, and the solar cells can be surrounded.

  However, in the above conventional solar cell module manufacturing method, a dedicated device is required to heat and pressurize in a vacuum state, and the operation of heating and pressurizing in a vacuum state is complicated and takes time to manufacture. have. Moreover, there are many parts which comprise a solar module, and it is necessary to store and manage each.

JP 2012-33571 A

  This invention is made | formed based on the above situations, and makes it a subject to provide the solar cell module which can be manufactured easily and reliably. Moreover, this invention makes it a subject to provide the manufacturing method of the photovoltaic cell protection sheet which can manufacture a photovoltaic module easily and reliably, and a photovoltaic module.

The solar cell module of the present invention made to solve the above problems is
A photovoltaic cell as a photovoltaic element;
A filler layer surrounding the solar cell;
A front sheet disposed on the surface side of the filler layer;
A back sheet disposed on the back side of the filler layer,
The filler layer is made of an adhesive.

  Since the solar cell module can surround the solar cell by the filler layer made of an adhesive without using a conventional sealing material sheet, it can be easily and reliably manufactured. In other words, for example, by laminating the pressure-sensitive adhesive layer on each of the front sheet and the back sheet and bonding the front sheet and the back sheet so that both the pressure-sensitive adhesive layers face each other via the solar battery cell, the solar A battery module can be manufactured. For this reason, the operation | work which heats and presses in a vacuum state conventionally is not especially required, and an apparatus for exclusive use is not especially required. In addition, since the solar cell module can be manufactured by the solar cell protective sheet and the solar cell each having an adhesive layer formed on the front sheet and the back sheet, the number of parts is small, and the storage and management thereof are easy. is there.

  The said solar cell module is good for a filler layer to have the 1st layer located in the surface side of the said photovoltaic cell, and the 2nd layer located in the back surface side of the said photovoltaic cell. As described above, the first layer is formed by the pressure-sensitive adhesive layer laminated on the front sheet, and the pressure-sensitive adhesive laminated on the back sheet. The second layer is formed by the agent layer.

  The front sheet and the first layer are preferably transparent. Thereby, the light which injects from a front sheet | seat can inject into a photovoltaic cell efficiently, and can improve electric power generation efficiency.

  When the above configuration is employed, a configuration in which the second layer is also transparent and the refractive index of the first layer and the refractive index of the second layer are different can be employed. Since the refractive index of the first layer and the refractive index of the second layer are different, at least a part of the light incident on the interface between the first layer and the second layer around the solar battery cell is reflected. And this reflected light can be recursed to the solar cell by re-reflecting at the interface between the first layer and the front sheet or the interface between the front sheet and the outside air (surface of the front sheet). In this way, light incident from the front sheet and not incident on the solar cell but incident on the interface between the first layer and the second layer can be reflected back to the first layer side and recurred to the solar cell. Therefore, the light incident on the solar cell module can be used effectively.

  When the refractive index of the first layer and the refractive index of the second layer are different as described above, the relative refractive index of the second layer with respect to the first layer may be 0.95 or less or 1.05 or more. preferable. When the relative refractive index of the second layer with respect to the first layer is within the above range, the reflectance of light at the interface between the first layer and the second layer increases, and the first layer around the solar battery cell Light incident on the interface with the second layer can be efficiently recurred. If the value is 0.95 or less, the refractive index of the second layer is sufficiently smaller than that of the first layer, so that the light incident from the first layer toward the second layer is totally reflected. Therefore, the light incident on the interface between the first layer and the second layer around the solar battery cell can be recurred more efficiently.

  On the other hand, it is also possible to employ a configuration in which the second layer is colored. Thereby, for example, by making the second layer a highly reflective color (for example, white), the light incident on the interface between the first layer and the second layer around the solar cell can be recursed to the solar cell. it can. Moreover, when it is desired to make the solar battery cell difficult to be visually recognized from the aesthetic point of view, for example, the second layer can have a similar color to the solar battery cell (for example, black).

  Preferably, the front sheet or the back sheet is a flexible film, and the first layer and the second layer are formed from pressure-sensitive adhesive layers laminated on the front sheet and the back sheet, respectively. Thus, for example, a solar battery cell is placed on the adhesive layer laminated on either the front sheet or the back sheet, and the flexible sheet of either the front sheet or the back sheet is placed on the solar battery cell. The solar cell module can be more easily and reliably manufactured by bonding the pressure-sensitive adhesive layers laminated on each other.

  The said solar cell module WHEREIN: It is preferable that the said filler layer is formed from the solvent type adhesive. By using a solvent-type pressure-sensitive adhesive, a pressure-sensitive adhesive having a desired component can be easily produced, and the thickness of the pressure-sensitive adhesive layer can be easily adjusted.

  In the solar cell module, it is preferable that the filler layer is formed of an acrylic pressure-sensitive adhesive. An acrylic pressure-sensitive adhesive has a good balance of adhesive force, holding power, and tack force, and is available at low cost. Therefore, the acrylic pressure-sensitive adhesive can be suitably used as a pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer.

  In the solar cell module, it is preferable that an average thickness of the pressure-sensitive adhesive layer is 30 μm or more and 1 mm or less. Thereby, the adhesive force of the front sheet and the back sheet through the filler layer is sufficiently ensured while meeting the demand for thin and light solar cell modules.

  Furthermore, the solar cell protective sheet of the present invention made in order to solve the above problems has a sheet body and an adhesive layer laminated on one surface of the sheet body.

  A pair of the solar cell protection sheets is prepared, and the solar cell module is manufactured easily and reliably by bonding the adhesive layers of the pair of solar cell protection sheets to face each other through the solar cells. be able to. For this reason, the operation | work which heats and presses in a vacuum state conventionally is not especially required, and an apparatus for exclusive use is not especially required. Moreover, since a solar cell module can be manufactured with the said photovoltaic cell and a photovoltaic cell, there are few number of parts and the storage and management are easy.

  In the solar cell protective sheet, the sheet body preferably has flexibility. Thereby, the adhesive layer of the said photovoltaic cell protection sheet which has flexibility can be easily and reliably bonded to the photovoltaic cell mounted in the adhesive layer of another photovoltaic cell protection sheet.

  As for the said photovoltaic cell protective sheet, it is preferable that a sheet | seat main body and an adhesive layer have transparency. Thereby, the sheet | seat main body of the said photovoltaic cell protection sheet can be used suitably as a front sheet located in the surface side of a photovoltaic cell.

  As for the said photovoltaic cell protective sheet, it is preferable that the sheet | seat main body or the adhesive layer is colored. Thereby, the sheet | seat main body of the said photovoltaic cell protection sheet can be used suitably as a back seat located in the back surface side of a photovoltaic cell.

  Moreover, the manufacturing method of the solar cell module of this invention made | formed in order to solve the said subject is the process of sticking the adhesive layer of the said solar cell protection sheet on the one surface of a photovoltaic cell, this solar cell. The process of sticking the adhesive layer of another said photovoltaic cell protection sheet to the other surface of a cell, and the process of pressing the layered product of the above-mentioned pair of photovoltaic cell protection sheets and photovoltaic cells from the front and back surfaces Have. Thereby, a solar cell module can be manufactured easily and reliably as described above.

  “Surface” means the light-receiving side surface of the solar cell module. The “back surface” refers to a surface opposite to the “front surface”. “Transparent” means that the total light transmittance is 90% or more, and conforms to JIS K7375. The “refractive index” means an absolute refractive index measured by light having a wavelength of 589.3 nm (sodium D-line). “Relative refractive index of the second layer relative to the first layer” refers to the ratio of the refractive index of the first layer to the refractive index of the second layer, and the absolute refractive index of the second layer is the absolute refractive index of the first layer. The value divided by. “Solvent-type pressure-sensitive adhesive” means a pressure-sensitive adhesive produced by melting raw materials in an organic solvent.

  As described above, the solar cell module according to the present invention has a small number of parts, and can be easily and reliably manufactured without particularly requiring heating and pressing in a vacuum state. Similarly, the solar cell protection sheet and the solar cell module manufacturing method according to the present invention can easily and reliably manufacture the solar cell module.

It is typical sectional drawing of the solar cell module which concerns on one Embodiment of this invention. It is typical sectional drawing of the photovoltaic cell protection sheet used in order to manufacture the solar cell module of FIG. It is typical sectional drawing for demonstrating the manufacturing process of the solar cell module using the photovoltaic cell protective sheet of FIG. It is typical sectional drawing of the photovoltaic cell protection sheet different from FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

<Solar cell module 1>
The solar cell module 1 of the embodiment shown in FIG. 1 includes a plate-like solar cell 2, a filler layer 3 surrounding the solar cell 2, a front sheet 5 laminated on the surface of the filler layer 3, And a back sheet 6 laminated on the back surface of the filler layer 3.

(Solar cell 2)
The said solar cell module 1 is arrange | positioned in the state which the several photovoltaic cell 2 has a fixed clearance gap on substantially the same plane. The photovoltaic cell 2 is a photovoltaic element that converts light energy into electrical energy, and a plurality of photovoltaic cells 2 are wired in series or in parallel (not shown). Examples of the solar battery cell 2 include a crystalline silicon solar electronic element such as a single crystal silicon type solar cell element and a polycrystalline silicon type solar cell element, an amorphous silicon solar cell element composed of a single junction type or a tandem structure type, and gallium arsenide. Group 3 to 5 compound semiconductor solar electronic devices such as (GaAs) and indium phosphorus (InP), and Group 2 to 6 compound semiconductor solar electronic devices such as cadmium tellurium (CdTe) and copper indium selenide (CuInSe ₂ ) Etc., and those hybrid elements can also be used.

  The magnitude | size and thickness of the photovoltaic cell 2 are not specifically limited, A various thing is employable according to a use. In addition, as average thickness of the photovoltaic cell 2, it is preferable that they are 80 micrometers or more and 1 mm or less, and it is more preferable that they are 90 micrometers or more and 200 micrometers or less. If the average thickness of the solar battery cell 2 is less than the above lower limit, there is a possibility that the function as the solar battery cell 2 is not sufficiently exhibited. If the average thickness exceeds the upper limit, the solar cell module 1 may not meet the demand for thinning.

(Filler layer 3)
The filler layer 3 has adhesion to the front sheet 5 and the back sheet 6, scratch resistance for protecting the solar battery cell 2, impact absorption, and the like. The filler layer 3 is made of an adhesive. Although this adhesive is not specifically limited, For example, an acrylic adhesive, an acrylic-rubber adhesive, a natural rubber adhesive, a synthetic rubber adhesive such as a butyl rubber, a silicone adhesive, a polyurethane adhesive, an epoxy It can be composed of a PSA adhesive, a polyethylene adhesive, and a polyester adhesive. Among these, an acrylic pressure-sensitive adhesive is particularly preferable because it has a good balance of adhesive force, holding force, and tack force and can be obtained at low cost.

  Although it does not specifically limit as a monomer which comprises an acrylic adhesive, For example, methyl acrylate, ethyl acrylate, n-butyl acrylate, methyl methacrylate, isobutyl acrylate, t-butyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl Acrylic acid alkyl esters such as acrylate, isononyl acrylate, ethyl methacrylate, n-butyl acrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, methacrylic acid alkyl esters (alkyl groups having 1 to 20 carbon atoms, for example); 2-hydroxy Ethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl methacrylate, 2 Hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate and other acrylic acid hydroxyalkyl esters, methacrylic acid hydroxyalkyl esters (hydroxyalkyl groups having 1 to 20 carbon atoms, for example); acrylic acid, methacrylic acid, maleic acid, fumaric acid, Examples thereof include unsaturated aliphatic carboxylic acids such as itaconic acid; vinyl acetate; and combinations thereof. Among these, n-butyl acrylate and 2-ethylhexyl acrylate are particularly preferable because they have good adhesive properties such as adhesive strength, holding power, and tack strength.

  Moreover, since the adhesive can easily adjust the thickness of the adhesive part, a solvent-type adhesive can be used, that is, the filler layer is formed of a composition containing the adhesive in the solvent. Yes. In addition, as the pressure-sensitive adhesive, an emulsion-type pressure-sensitive adhesive or a hot-melt type pressure-sensitive adhesive can also be employed.

  The solvent-type pressure-sensitive adhesive is produced by melting in an organic solvent. As the organic solvent, for example, toluene or ethyl acetate is used. In the case of the acrylic pressure-sensitive adhesive, a solvent-type acrylic pressure-sensitive adhesive can be produced by melting the monomer in an organic solvent such as toluene or ethyl acetate and polymerizing it with a polymerization initiator. Thereby, while having the advantages of the acrylic pressure-sensitive adhesive described above, a pressure-sensitive adhesive having a desired component can be easily produced, and the thickness of the filler layer 3 can be easily adjusted.

  Moreover, the said adhesive can also employ | adopt the adhesive containing a thermosetting component. Although it does not specifically limit as an adhesive containing a thermosetting component, A thermosetting rubber adhesive, a thermosetting silicone adhesive, a thermosetting acrylic adhesive, etc. can be used. Although it does not specifically limit as these thermosetting components as these thermosetting components, An epoxy resin, unsaturated polyester resin, a phenol resin, etc. can be mix | blended. Further, as the thermosetting acrylic pressure-sensitive adhesive, a thermosetting pressure-sensitive adhesive disclosed in JP-A-10-292163, specifically, a (meth) acrylic acid alkyl ester-based polymer and an epoxy-based crosslinking agent, etc. And the like subjected to crosslinking treatment.

  The average thickness of the filler layer 3 is preferably 30 μm or more and 1 mm or less, and preferably 50 μm or more and 500 μm or less. If the average thickness of the filler layer 3 is less than the lower limit, the solar battery cell 2 may not be surrounded. On the other hand, if the average thickness exceeds the upper limit, the solar cell module 1 may be contrary to the demand for thinning.

  The filler layer 3 has a two-layer structure of a first layer 8 located on the front surface side of the solar battery cell 2 and a second layer 9 located on the back surface side of the solar battery cell 2. An interface between the first layer 8 and the second layer 9 is formed around the cell 2 (a gap between the solar battery cells 2).

  The average thickness of the first layer 8 and the average thickness of the second layer 9 are not particularly limited, but the ratio of the average thickness of the second layer 9 to the average thickness of the first layer 8 is 0.9 or more. It is preferably 1 or less. Thereby, the solar cell 2 can be accurately surrounded by the first layer 8 and the second layer 9.

  The first layer 8 and the second layer 9 can have the same configuration, but the first layer 8 and the second layer 9 can have different configurations as described below.

  That is, the first layer 8 is preferably transparent, but the second layer 9 can be colored. Here, in coloring the second layer 9, it is possible to contain a pigment in the pressure-sensitive adhesive forming the second layer 9.

  Examples of the pigment include a white pigment and a black pigment. Here, when a white pigment is used as the pigment, the light incident on the interface between the first layer 8 and the second layer 9 can be diffusely reflected and returned to the solar battery cell 2. In addition, when a black pigment is used as the pigment, the solar battery cell 2 generally exhibits a black color, so that the solar battery cell 2 and the gap between the solar battery cell 2 are difficult to distinguish, and the aesthetic appearance is excellent.

  The white pigment is not particularly limited, and for example, calcium carbonate, titanium oxide, zinc oxide, lead carbonate, barium sulfate and the like can be used. Among these, calcium carbonate, which is excellent in dispersibility in the pressure-sensitive adhesive and has a relatively large effect of improving the durability, heat resistance, strength and the like of the second layer 9, is preferable. This calcium carbonate has crystal types such as calcite, aragonite, and vaterite, and any crystal type can be used. This calcium carbonate may be surface-treated with stearic acid, sodium dodecyl benzene sulfonate, silane coupling agent, titanium coupling agent, etc., and impurities such as magnesium oxide, aluminum oxide, silicon dioxide, titanium dioxide, etc. About 10% or less may be contained. As the black pigment, carbon black, black perylene pigment or the like can be used. Examples of other pigments include blue pigments such as ultramarine and bitumen, red pigments such as bengara (iron oxide red), cadmium red, and molybdenum orange, and metal powder pigments that give metallic luster.

  The average particle diameter of the pigment is preferably from 100 nm to 30 μm, and more preferably from 200 nm to 20 μm. If the average particle diameter of the pigment is less than the lower limit, the coloring effect (reflectivity and blackness) of the second layer 9 may not be sufficiently exhibited. On the other hand, when the average particle diameter exceeds the upper limit, there is a risk of lack of adhesiveness with the solar cell 2 of the second layer 9.

  The blending amount of the pigment (the blending amount in terms of solid content of the entire pigment contained in the second layer 9 with respect to 100 parts by weight of the base polymer in the polymer composition that is a forming material of the second layer 9) is 3 parts by mass or more. Preferably, it is 10 parts by mass or more, and more preferably 20 parts by mass or more. Moreover, the blending amount of the pigment is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and further preferably 30 parts by mass or less. If the blending amount of the pigment is less than the lower limit, the coloring effect of the second layer 9 may not be sufficiently exhibited. On the other hand, when the said compounding quantity exceeds the said upper limit, there exists a possibility that the adhesive force of an adhesive may fall.

  It is also possible to adopt a configuration in which the second layer 9 is transparent like the first layer 8. Here, when the 1st layer 8 and the 2nd layer 9 are transparent, the structure from which the refractive index of the 1st layer 8 and the refractive index of the 2nd layer 9 differ is employable. Thereby, the light incident on the interface between the first layer 8 and the second layer 9 can be reflected and returned to the solar battery cell 2. Moreover, the structure whose relative refractive index of the 2nd layer 9 with respect to the 1st layer 8 is 1.05 or more is employable. Thereby, the reflectance of the light in the interface of the 1st layer 8 and the 2nd layer 9 becomes high, and the light which injected into this interface can be efficiently recursed to the photovoltaic cell 2. FIG.

  In addition, even if it is a case where the structure of the 1st layer 8 and the 2nd layer 9 is different, the main component of the adhesive which forms the 1st layer 8, and the main component of the adhesive which forms the 2nd layer 9 are It is preferable that they are the same. Thereby, the adhesiveness of the 1st layer 8 and the 2nd layer 9 improves.

(Front seat 5)
The front sheet 5 has transparency and flexibility, and has a synthetic resin sheet whose main component is a synthetic resin. The light transmittance of the two layers of the front sheet 5 and the first layer 8 is preferably 93% or more, and more preferably 95% or more. Thereby, the power generation efficiency of the solar cell module 1 can be increased.

  The synthetic resin as the main component of the front sheet 5 is not particularly limited, but the front sheet 5 may have weather resistance, hydrolysis resistance, ultraviolet absorption ability, gas barrier properties, and voltage resistance depending on the purpose. Are preferably used, and those having flame retardancy, salt damage resistance, ammonia resistance and the like are used depending on the application. Here, examples of the synthetic resin as the main component of the front sheet 5 include, for example, polyethylene resins, polypropylene resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymers (AS resins), acrylonitrile-butadiene-styrene. Copolymer (ABS resin), polyvinyl chloride resin, fluorine resin, poly (meth) acrylic resin, polycarbonate resin, polyester resin, polyamide resin, polyimide resin, polyamideimide resin, polyaryl phthalate Resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin, acetal resin, cellulose resin and the like. Among the above resins, polyester resins, fluorine resins and cyclic polyolefin resins having high heat resistance, strength, weather resistance, durability, gas barrier properties against water vapor and the like are preferable.

  Examples of the polyester resin include polyethylene terephthalate and polyethylene naphthalate. Among these polyester-based resins, polyethylene terephthalate is particularly preferable because it has a good balance between various functions such as heat resistance and weather resistance, and price.

  Examples of the fluororesin include polytetrafluoroethylene (PTFE), perfluoroalkoxy resin (PFA) made of a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and a copolymer of tetrafluoroethylene and hexafluoropropylene (FEP). Copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether and hexafluoropropylene (EPE), copolymer of tetrafluoroethylene and ethylene or propylene (ETFE), polychlorotrifluoroethylene resin (PCTFE), ethylene and chlorotrifluoroethylene Copolymer (ECTFE), vinylidene fluoride resin (PVDF), vinyl fluoride resin (PVF), and the like. Among these fluororesins, polyvinyl fluoride resin (PVF) and a copolymer of tetrafluoroethylene and ethylene or propylene (ETFE) which are excellent in strength, heat resistance, weather resistance and the like are particularly preferable.

  As the cyclic polyolefin resin, for example, a) cyclic dienes such as cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof), cyclohexadiene (and derivatives thereof), norbornadiene (and derivatives thereof) are polymerized. And b) a copolymer obtained by copolymerizing the cyclic diene with one or more olefinic monomers such as ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. . Among these cyclic polyolefin resins, cyclopentadiene (and derivatives thereof), dicyclopentadiene (and derivatives thereof) or norbornadiene (and derivatives thereof) such as polymers having excellent strength, heat resistance, and weather resistance are particularly preferred. preferable.

  In addition, as a forming material of the said synthetic resin sheet, the said synthetic resin can be used 1 type or in mixture of 2 or more types. In addition, various additives and the like can be mixed in the forming material of the surface side base material layer for the purpose of improving and modifying processability, heat resistance, weather resistance, mechanical properties, dimensional stability, and the like. . Examples of the additive include a lubricant, a crosslinking agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing fiber, a reinforcing agent, an antistatic agent, a flame retardant, a flame retardant, a foaming agent, and an antifungal agent. And pigments. The method for forming the front sheet 5 is not particularly limited, and known methods such as an extrusion method, a cast forming method, a T-die method, a cutting method, and an inflation method are employed.

  As a minimum of average thickness of the above-mentioned synthetic resin sheet, 25 micrometers is preferred and 50 micrometers is more preferred. On the other hand, the upper limit of the average thickness of the synthetic resin sheet is preferably 300 μm, and more preferably 188 μm. If the thickness of the front sheet 5 is less than the lower limit, it may be difficult to handle the front sheet 5 before the solar cell module 1 is manufactured. Moreover, if the average thickness exceeds the upper limit, the solar cell module 1 is contrary to the demand for thinning.

  In the above description, the front sheet 5 is composed of one layer of the synthetic resin sheet. However, the front sheet 5 is a topcoat treatment layer (not shown) formed on the surface (outermost surface) of the synthetic resin sheet. ).

  The top coat treatment can be performed by applying a top coat agent. Examples of the topcoat agent include a polyester topcoat agent, a polyamide topcoat agent, a polyurethane topcoat agent, an epoxy topcoat agent, a phenol topcoat agent, a (meth) acrylic topcoat agent, and polyvinyl acetate. A polyolefin topcoat agent such as a polyethylene topcoat agent, a polyethylene aly polypropylene, a cellulose topcoat agent, or the like can be used. Of these topcoat agents, polyester-based topcoat agents are particularly preferred.

The lower limit of the coating amount of the top coating agent (in terms of solid content) is preferably ^{1g / m 2, 3g / m} 2 is particularly preferred. In contrast, the upper limit of the amount of coating of the top coating agent is preferably from ^{20g / m 2, 10g / m} 2 is particularly preferred. If the coating amount of the topcoat agent is less than the above lower limit, the protective effect may be reduced. Moreover, even if the coating amount exceeds the upper limit, the protective effect does not increase so much, the thickness of the front seat 5 increases, and there is a risk that it may violate the demand for thinning.

  In the top coat agent, various additives such as a silane coupling agent for improving adhesion, an ultraviolet absorber for improving weather resistance, an inorganic filler for improving heat resistance and the like are appropriately used. Can be mixed. The mixing amount of the additive is preferably 0.1% by mass or more and 10% by mass or less in view of the balance between the effect expression of the additive and the function inhibition of the topcoat agent.

(Back sheet 6)
The back sheet 6 has flexibility, and has a synthetic resin sheet whose main component is a synthetic resin like the front sheet 5. As the back sheet 6, as in the case of the front sheet 5, those having weather resistance, hydrolysis resistance, ultraviolet absorption ability, gas barrier property, voltage resistance, etc. are suitably used according to the purpose, and depending on the application. Those having flame resistance, salt damage resistance, ammonia resistance and the like are used. The back seat 6 may be a seat having the same configuration as that of the front seat 5, and may have a different configuration (for example, different main components) from the front seat 5. In addition, since the specific content of the synthetic resin sheet of the back seat | sheet 6 is the same as that of the front seat | sheet 5, detailed description is abbreviate | omitted.

  Note that the back sheet 6 may be a colored sheet unlike the front sheet 5. Specifically, a pigment can be contained in the backsheet 6.

  Examples of the pigment include a white pigment and a black pigment. Here, when a white pigment is used as the pigment, the light incident from the interface between the first layer 8 and the second layer 9 and reaching the back sheet 6 can be diffusely reflected and returned to the solar battery cell 2. it can. In addition, when a black pigment is used as the pigment, the solar battery cell 2 generally exhibits a black color, so that the solar battery cell 2 and the gap between the solar battery cell 2 are difficult to distinguish, and the aesthetic appearance is excellent.

  The white pigment is not particularly limited, and for example, calcium carbonate, titanium oxide, zinc oxide, lead carbonate, barium sulfate and the like can be used. Among these, calcium carbonate, which is excellent in dispersibility in the synthetic resin material forming the back sheet 6 and has a relatively large effect of improving the durability, heat resistance, strength and the like of the back sheet 6, is preferable. This calcium carbonate has crystal types such as calcite, aragonite, and vaterite, and any crystal type can be used. This calcium carbonate may be surface-treated with stearic acid, sodium dodecyl benzene sulfonate, silane coupling agent, titanium coupling agent, etc., and impurities such as magnesium oxide, aluminum oxide, silicon dioxide, titanium dioxide, etc. About 10% or less may be contained. As the black pigment, carbon black, black perylene pigment or the like can be used. Examples of other pigments include blue pigments such as ultramarine and bitumen, red pigments such as bengara (iron oxide red), cadmium red, and molybdenum orange, and metal powder pigments that give metallic luster.

  The lower limit of the average particle diameter of the pigment is preferably 100 nm, and more preferably 300 nm. On the other hand, as an upper limit, 30 micrometers is preferable and 3 micrometers is more preferable. If the average particle diameter of the pigment is less than the above lower limit, uniform dispersion in the back sheet 6 may be difficult due to aggregation or the like. On the other hand, when the average particle diameter exceeds the upper limit, the effect of improving various properties such as heat resistance with respect to the front sheet 5 may be reduced.

  The blending amount of the pigment (the blending amount in terms of solid content of the entire pigment contained in the backsheet 6 with respect to 100 parts by weight of the resin that is the main component of the backsheet forming material) is preferably 3 parts by mass or more, and 8 masses. More preferably, it is at least part. Moreover, it is preferable that the compounding quantity of the said pigment is 45 mass parts or less, and it is more preferable that it is 25 mass parts or less. When the pigment content is less than the above lower limit, the effect of improving the durability, heat resistance, strength and the like of the back sheet 6 is reduced. On the other hand, when the content exceeds the above upper limit, the dispersibility of the pigment in the backsheet 6 is lowered, and the strength of the backsheet 6 may be lowered.

  In addition, in the said description, although the back sheet 6 demonstrated what consists of the said synthetic resin sheet, the back sheet 6 has what has the gas barrier layer (not shown) laminated | stacked on the back surface side of the said synthetic resin sheet. It is also possible to adopt. This gas barrier layer is a layer having a function of reducing permeation of gas such as hydrogen gas and oxygen gas. This gas barrier layer can be comprised, for example from the gas barrier film by which the inorganic oxide layer was laminated | stacked on the base film.

  The base film of the gas barrier layer is formed with a synthetic resin as a main component. As the synthetic resin as the main component of the base film, the same synthetic resin as that of the front sheet 5 is used, and among these, polyethylene terephthalate having particularly good balance of various functions such as heat resistance and weather resistance and price is particularly preferable. .

  As a minimum of average thickness of the above-mentioned substrate film, 7 micrometers is preferred and 10 micrometers is especially preferred. On the other hand, as an upper limit, 50 micrometers is preferable and 25 micrometers is especially preferable. When the thickness of the base film is less than the above lower limit, problems such as curl are likely to occur during vapor deposition for forming the inorganic oxide layer, and handling becomes difficult. On the other hand, if the thickness of the base film exceeds the above upper limit, the solar cell module 1 is contrary to the demand for reduction in thickness and weight.

  The inorganic oxide layer is a layer for expressing gas barrier properties against oxygen, water vapor, and the like, and is formed by depositing an inorganic oxide on the back surface of the base film. The vapor deposition means for forming this inorganic oxide layer is not particularly limited as long as the inorganic oxide can be vapor deposited on the synthetic resin base film without causing deterioration such as shrinkage and yellowing. (A) Physical vapor deposition method (Physical Vapor Deposition method; PVD method) such as vacuum deposition method, sputtering method, ion plating method, ion cluster beam method, (b) Plasma chemical vapor deposition method, thermal chemical vapor deposition method, A chemical vapor deposition method (Chemical Vapor Deposition method; CVD method) such as a photochemical vapor deposition method is employed. Among these vapor deposition methods, a vacuum vapor deposition method and an ion plating method that can form a high-quality inorganic oxide layer with high productivity are preferable.

  The inorganic oxide constituting the inorganic oxide layer is not particularly limited as long as it has gas barrier properties. For example, aluminum oxide, silica oxide, titanium oxide, zirconium oxide, zinc oxide, tin oxide, magnesium oxide Among them, aluminum oxide or silica oxide having a good balance between gas barrier properties and price is particularly preferable.

  The lower limit of the average thickness of the inorganic oxide layer is preferably 3 mm, and particularly preferably 400 mm. On the other hand, the upper limit of the thickness of the inorganic oxide layer is preferably 3000 mm, and particularly preferably 800 mm. If the thickness of the inorganic oxide layer is smaller than the above lower limit, the gas barrier property may be lowered. On the other hand, when the thickness of the inorganic oxide layer exceeds the above upper limit, the flexibility of the inorganic oxide layer is reduced, and defects such as cracks are likely to occur.

  The inorganic oxide layer may have a single layer structure or a multilayer structure of two or more layers. By making the inorganic oxide layer into a multilayer structure in this way, the deterioration of the base film is reduced by reducing the thermal burden applied during vapor deposition, and the adhesion between the base film and the inorganic oxide layer is further improved. can do. The vapor deposition conditions in the physical vapor deposition method and the chemical vapor deposition method are appropriately designed according to the resin type of the base film, the thickness of the inorganic oxide layer, and the like.

  Moreover, in order to improve the adhesiveness etc. of a base film and an inorganic oxide layer, it is good to give a surface treatment to the vapor deposition surface of a base film. Examples of such adhesion improving surface treatment include (a) corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals, and the like ( b) Primer coat treatment, undercoat treatment, anchor coat treatment, vapor deposition anchor coat treatment and the like. Among these surface treatments, corona discharge treatment and anchor coat treatment that are excellent in adhesion to the inorganic oxide layer and contribute to the formation of a dense and uniform inorganic oxide layer are preferable.

  Examples of the anchor coating agent used for the anchor coating treatment include a polyester anchor coating agent, a polyamide anchor coating agent, a polyurethane anchor coating agent, an epoxy anchor coating agent, a phenol anchor coating agent, and a (meth) acrylic anchor coating. Agents, polyvinyl acetate anchor coating agents, polyolefin anchor coating agents such as polyethylene aly polypropylene, and cellulose anchor coating agents. Among these anchor coating agents, polyester anchor coating agents that can further improve the adhesion between the base film and the inorganic oxide layer are particularly preferable.

The lower limit of the coating amount of the anchor coating agent (solid content) is preferably ^{0.1g / m 2, 1g / m} 2 is particularly preferred. In contrast, the upper limit of the amount of coating of the anchor coating agent is preferably ^{5g / m 2, 3g / m} 2 is particularly preferred. If the coating amount of the anchor coating agent is smaller than the above lower limit, the effect of improving the adhesion between the base film and the inorganic oxide layer may be reduced. On the other hand, when the coating amount of the anchor coating agent exceeds the above upper limit, the strength, durability and the like of the back sheet 6 may be reduced.

  In addition, in the above-mentioned anchor coating agent, there are various silane coupling agents for improving adhesion, anti-blocking agents for preventing blocking with a base film, ultraviolet absorbers for improving weather resistance, etc. Additives can be mixed as appropriate. The amount of the additive to be mixed is preferably 0.1% by weight or more and 10% by weight or less from the balance between the effect expression of the additive and the function inhibition of the anchor coating agent.

  Furthermore, the back sheet 6 may have a hydrolysis-resistant resin layer (not shown) laminated on the back side of the synthetic resin layer. In addition, when the said gas barrier layer is also laminated | stacked, it is preferable that the hydrolysis-resistant resin layer is laminated | stacked on the back surface side of the gas barrier layer.

  This hydrolysis-resistant resin layer can be composed of a sheet containing a synthetic resin as a main component. Polyethylene naphthalate (PEN), which is excellent in hydrolysis resistance and heat resistance, is used as a synthetic resin as a main component of the hydrolysis resistant resin layer.

  The polyethylene naphthalate is a polyester resin having ethylene naphthalate as a main repeating unit, and synthesized using naphthalenedicarboxylic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component.

  The ethylene naphthalate unit is preferably 80 mol% or more of all repeating units of the polyester. If the proportion of ethylene naphthalate units is less than 80 mol%, the hydrolysis resistance, strength, and barrier properties of polyethylene naphthalate may be reduced.

  Examples of the naphthalenedicarboxylic acid include 2,6-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 1,3-naphthalenedicarboxylic acid, and the like. In view of surface, 2,6-naphthalenedicarboxylic acid is particularly preferable.

  The hydrolysis-resistant resin layer may contain a carbodiimide compound in polyethylene naphthalate which is a main component. Thus, the hydrolysis resistance of the said back side base material layer improves markedly by containing a carbodiimide compound. As content of this carbodiimide compound, 0.1 mass% or more and 10 mass% or less are preferable, and 0.5 mass% or more and 3 mass% or less are especially preferable. Thus, the hydrolysis resistance of the said hydrolysis-resistant resin layer can be effectively improved by making content of a carbodiimide compound into the said range.

  Examples of the carbodiimide compound include (a) N, N′-diphenylcarbodiimide, N, N′-diisopropylphenylcarbodiimide, N, N′-dicyclohexylcarbodiimide, 1,3-diisopropylcarbodiimide, and 1- (3-dimethylaminopropyl). And monocarbodiimides such as (3-ethylcarbodiimide) and (b) polycarbodiimide compounds such as poly (1,3,5-triisopropylphenylene-2,4-carbodiimide). Among these, N, N′-diphenylcarbodiimide and N, N′-diisopropylphenylcarbodiimide are preferable, and the hydrolysis resistance of the hydrolysis-resistant resin layer can be further improved. Moreover, as a molecular weight of a carbodiimide compound, the range of 200-1000, especially the range of 200-600 are preferable. When the molecular weight exceeds the above upper limit, the dispersibility of the carbodiimide compound in the resin is lowered, and when the molecular weight is less than the lower limit, the scattering property of the carbodiimide compound may be increased.

  Moreover, the said hydrolysis-resistant resin layer is good to contain antioxidant in addition to the said carbodiimide compound in the polyethylene naphthalate which is a main component. Thus, by including both a carbodiimide compound and antioxidant in polyethylene naphthalate, the said hydrolysis resistance improves markedly, Furthermore, decomposition | disassembly of a carbodiimide compound can also be suppressed. As content of this antioxidant, 0.05 mass% or more and 1 mass% or less are preferable, and 0.1 mass% or more and 0.5 mass% or less are especially preferable. If the content of the antioxidant is less than the above lower limit, the carbodiimide degradation inhibiting function and hydrolysis resistance may be reduced, and if the content of the antioxidant exceeds the upper limit, the back side base material layer. There is a risk that the color tone of the product may be impaired. Specifically, hindered phenol compounds and thioether compounds, particularly hindered phenol compounds, are preferable as the antioxidant, and the hydrolysis resistance of the hydrolysis-resistant resin layer can be effectively improved. . The mass ratio of the antioxidant content to the carbodiimide compound content is preferably 0.1 or more and 1.0 or less, and particularly preferably 0.15 or more and 0.8 or less. If this mass ratio is less than the above lower limit, the effect of suppressing hydrolysis of carbodiimide itself may be insufficient. Conversely, if this mass ratio exceeds the above upper limit, the effect of suppressing hydrolysis of carbodiimide will peak. become. In addition, the addition method of a carbodiimide compound and antioxidant may be a method of kneading to polyethylene naphthalate or a method of adding to a polycondensation reaction of polyethylene naphthalate.

The terminal carboxyl group amount of polyethylene naphthalate is preferably 10 eq / T (equivalent / 10 ⁶ g) or more and 40 eq / T or less, particularly preferably 10 eq / T or more and 30 eq / T or less, more preferably 10 eq / T or more and 25 eq / T or less. If the amount of terminal carboxyl groups exceeds the above upper limit, the effect of improving hydrolysis resistance by the carbodiimide compound may be reduced, and if the amount of terminal carboxyl groups is less than the above lower limit, productivity may be reduced.

  The hydrolysis-resistant resin layer may contain an aromatic polyester in addition to polyethylene naphthalate. Thus, by containing aromatic polyester in polyethylene naphthalate, knot strength, delamination resistance, mechanical strength, etc. can be improved while maintaining the hydrolysis resistance of the hydrolysis resistant resin layer. As content of this aromatic polyester, 1 to 10 mass% is preferable. By making content of aromatic polyester into the said range, knot strength, delamination resistance, mechanical strength, etc. can be improved effectively. Specifically, the aromatic polyester is preferably a polyester obtained by copolymerizing a terephthalic acid component and 4,4'-diphenyldicarboxylic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component.

  The lower limit of the average thickness of the hydrolysis-resistant resin layer is preferably 12 μm and particularly preferably 25 μm. On the other hand, as an upper limit, 50 micrometers is preferable and 40 micrometers is especially preferable. If the average thickness of the hydrolysis-resistant resin layer is less than the above lower limit, the durability improvement effect of the hydrolysis-resistant resin layer due to the hydrolysis resistance of polyethylene naphthalate may not be sufficiently exerted, and its handling becomes difficult. Inconvenience, such as becoming, also occurs. Moreover, when the said average thickness exceeds the said upper limit, there exists a possibility of contrary to the request | requirement of thickness reduction of the solar cell module 1. FIG.

  The synthetic resin sheet, gas barrier layer, and hydrolysis-resistant resin layer can be laminated and bonded via an adhesive layer (not shown). As an adhesive constituting the adhesive layer, a laminating adhesive or a melt-extruded resin is used. Examples of the laminating adhesive include dry laminating adhesive, wet laminating adhesive, hot melt laminating adhesive, non-solvent laminating adhesive, and the like. Among these laminating adhesives, a dry laminate having excellent adhesion strength, durability, weather resistance, etc., and a function of sealing and protecting defects (for example, scratches, pinholes, recesses, etc.) on the surface of the inorganic oxide layer. Especially preferred are adhesives.

  Examples of the dry laminate adhesive include polyvinyl acetate adhesive, homopolymers such as ethyl acrylate, butyl, 2-ethylhexyl ester, and copolymers thereof with methyl methacrylate, acrylonitrile, styrene, and the like. Polyacrylic acid ester adhesive, cyanoacrylate adhesive, ethylene copolymer adhesive consisting of a copolymer of ethylene and monomers such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc., cellulose adhesive Agent, polyester adhesive, polyamide adhesive, polyimide adhesive, urea resin, melamine resin amino resin adhesive, phenol resin adhesive, epoxy adhesive, polyurethane adhesive, reactive type ( (Meth) acrylic adhesive, chloroprene rubber, nitrile rubber Styrene - butadiene made of rubber or the like rubber adhesive, a silicone-based adhesive, an alkali metal silicate, and the like inorganic adhesive made of a low-melting-point glass or the like. Among these adhesives for dry lamination, a decrease in adhesive strength and delamination caused by long-term outdoor use of the back sheet 6 for the solar cell module 1 can be prevented, and further deterioration of the adhesive layer such as yellowing can be prevented. Reduced polyurethane adhesives, particularly polyester urethane adhesives are preferred. The curing agent is preferably an aliphatic polyisocyanate with little thermal yellowing.

  Examples of the melt-extruded resin include polyethylene resins, polypropylene resins, acid-modified polyethylene resins, acid-modified polypropylene resins, ethylene-acrylic acid or methacrylic acid copolymers, Surlyn resins, and ethylene-vinyl acetate copolymers. One or more thermoplastic resins such as polyvinyl acetate resin, ethylene-acrylic acid ester or methacrylic acid ester copolymer, polystyrene resin, and polyvinyl chloride resin can be used. In addition, when employ | adopting the extrusion laminating method using the said melt extrusion resin, in order to obtain stronger adhesive strength, it is good to give surface treatments, such as the above-mentioned anchor coat process, to the lamination | stacking opposing surface of each said sheet | seat.

The lower limit of the amount of lamination of the adhesive layer (solid content), preferably ^{1g / m 2, 3g / m} 2 is particularly preferred. In contrast, the upper limit of the lamination of the adhesive layer is preferably 20 g / ^{m 2,} particularly preferably 15 g / ^{m 2.} If the amount of the adhesive layer is less than the above lower limit, the adhesive strength and the defect sealing function of the inorganic oxide layer may not be obtained. On the other hand, when the lamination amount of the adhesive layer exceeds the above upper limit, the lamination strength and durability may be lowered.

  In addition, in the laminating adhesive or melt-extruded resin for forming the adhesive layer, for the purpose of improving and modifying the handling property, heat resistance, weather resistance, mechanical properties, etc., for example, a solvent, a lubricant, a crosslinking agent, Various additives such as antioxidants, ultraviolet absorbers, light stabilizers, fillers, reinforcing fibers, reinforcing agents, antistatic agents, flame retardants, flameproofing agents, foaming agents, antifungal agents, pigments and the like are mixed as appropriate. be able to.

  The back sheet 6 can also have a top coat treatment layer (not shown) formed on the back surface (outermost surface) of the synthetic resin sheet, similarly to the front sheet 5.

<Solar cell protection sheet>
Next, the solar cell protection sheet used when manufacturing the solar cell module 1 will be described.

  This solar cell protective sheet has a pair of solar cell protective sheets 10. One solar cell protection sheet 10 (hereinafter sometimes referred to as a front surface side protection sheet 10) forms the front sheet 5 of the solar cell module 1 and the first layer 8 of the filler layer 3. The other solar cell protection sheet 10 (hereinafter sometimes referred to as a back side protection sheet) forms the back sheet 6 of the solar cell module 1 and the second layer 9 of the filler layer 3. . In addition, in FIG. 2, the example of the surface side protection sheet 10 is shown.

(Solar cell protection sheet 10)
The solar cell protective sheet 10 includes a sheet body 5 and an adhesive layer 8 laminated on one surface of the sheet body 5. The solar cell protective sheet 10 shown in FIG. 2 further includes a release sheet 11 laminated on one surface of the pressure-sensitive adhesive layer 8.

  After the solar cell module 1 is manufactured, the sheet body 5 of the front surface side protective sheet 10 constitutes the front sheet 5, the adhesive layer 8 of the front surface side protective sheet 10 constitutes the first layer 8 of the filler layer 3, and the back surface side. The sheet body 5 of the protective sheet constitutes the back sheet 6, and the adhesive layer 8 of the back surface side protective sheet is provided to constitute the second layer 9 of the filler layer 3. In addition, since the specific description of each of these members is the same as the description of the solar cell module 1 described above, the description is omitted.

  The pressure-sensitive adhesive layer 8 can be laminated by transferring the pressure-sensitive adhesive to the surface of the sheet body 5. For this transfer, a transfer sheet to which an adhesive is attached can be used. Thereby, the adhesive layer 8 can be formed easily and stably.

<Method for Manufacturing Solar Cell Module 1>
Next, the manufacturing method of the said solar cell module 1 using the said solar cell protection sheet is demonstrated.

  The manufacturing method of the said solar cell module 1 is the 1st lamination process which sticks the adhesive layer 8 of a back surface side protection sheet on the back surface of the photovoltaic cell 2, The adhesion of the surface side protection sheet 10 on the surface of this photovoltaic cell 2 It has the 2nd lamination process which sticks the agent layer 8, and the pressurization process which pressurizes the laminated body of a pair of photovoltaic cell protective sheet 10 and the photovoltaic cell 2 from front and back.

  In the first stacking step, a plurality of solar cells 2 are mounted on the procedure of peeling the release sheet 11 of the back surface side protective sheet and the adhesive layer 8 of the back surface side protective sheet from which the release sheet 11 is peeled and exposed. Procedures.

  In the second laminating step, the procedure for peeling the release sheet 11 of the front surface side protective sheet 10 and the front side protective sheet 10 from which the release sheet 11 has been peeled off are the adhesive for the back side protective sheet in the first laminating step. It has the procedure laminated | stacked on the photovoltaic cell 2 mounted in the layer 8 so that the adhesive layers 8 may oppose as shown in FIG. When this surface-side protection sheet 10 is laminated on the solar battery cell 2, the surface-side protection sheet 10 has flexibility, so that the upper surface of the solar battery cell 2 is bent while the surface-side protection sheet 10 is bent as shown in FIG. Can be laminated.

  In the pressurizing step, the stacked laminate is pressed from the front and back surfaces (upper and lower) by, for example, a pair of rollers, and the adhesive layers 8 are interfaced around the solar cells 2 (gap between the solar cells 2). Is forming. Thereby, it is difficult for air to remain around the solar battery cell 2 (a gap between the solar battery cells 2). In addition, this pressurization process can also be performed simultaneously with the process of laminating | stacking the surface side protection sheet 10 on the photovoltaic cell 2 in said 2nd lamination process. As a result, air is less likely to remain around the solar battery cell 2.

<Advantages>
The said solar cell module 1 surrounds the photovoltaic cell 2 with the adhesive layers 8 and 9 (filler layer 3) by inserting | pinching the photovoltaic cell 2 using the surface side protection sheet 10 and a back surface side protection sheet. It can be manufactured easily and reliably without using a conventional sealing material sheet. For this reason, the operation | work which heats and presses in a vacuum state conventionally is not especially required, and a dedicated apparatus is also unnecessary.

  Moreover, since the said solar cell module 1 can be manufactured with a pair of photovoltaic cell protection sheet 10 and the photovoltaic cell 2, there are few number of parts, and the storage and management are easy.

  Moreover, since the first layer 8 and the second layer 9 of the filler layer are formed by the respective pressure-sensitive adhesive layers 8 of the pair of solar cell protective sheets 10, the optical characteristics of each pressure-sensitive adhesive layer 8 can be used for purposes and purposes. It becomes possible to change according to.

<Other embodiments>
The above embodiment has the above-described advantages from the above configuration, but the present invention is not limited to this, and the design can be changed as appropriate within the intended scope of the present invention.

  That is, in the said embodiment, although the method to manufacture the solar cell module 1 using the surface side protection sheet 10 and back surface side protection sheet which consist of a different structure was demonstrated, this invention is not limited to this. It is also possible to manufacture the solar cell module 1 using one type of solar cell protection sheet 10. That is, it is also possible to manufacture the solar cell module 1 by sticking a pair of solar cell protection sheets 10 having the same configuration from the front surface side and the back surface side of the solar cell 2.

  Moreover, in the said photovoltaic cell protection sheet, the release sheet 11 is not an indispensable component, and even if there is no release sheet 11, it is in the range intended by the present invention. For example, as shown in FIG. 4, the solar cell protective sheet roll 13 in which the solar cell protective sheet 10 is wound in a roll shape with the pressure-sensitive adhesive layer 8 side inside is also within the intended range of the present invention. . This solar cell protection sheet roll 13 can reduce the storage space of the solar cell protection sheet 10 and improve the handleability.

  Furthermore, in the said solar cell module, both the front sheet | seat 5 and the back sheet | seat 6 (sheet main body 5 of the photovoltaic cell 2) are not limited to what has flexibility. Moreover, it is also possible to use the transparent glass substrate used with the conventional solar cell module 1 as the front sheet 5. However, it is preferable that at least one of the front sheet 5 and the back sheet 6 has flexibility, so that the solar cell protection sheet 10 can be easily and reliably attached to the solar cell 2 while being bent. . Moreover, when manufacturing the said solar cell module, when the laminated body of a pair of photovoltaic cell protection sheet 10 and the photovoltaic cell 2 is pressurized from the front and back, the flexible sheet | seat main body 5 bends, and a photovoltaic cell Air around 2 hardly remains.

  Moreover, the said solar cell module is not limited to what was manufactured by the manufacturing method of the said embodiment. Moreover, in the manufacturing method of the said solar cell module, when the filler layer 3 is formed with the adhesive made from a thermosetting resin or the adhesive made from an ultraviolet curable resin, after the said pressurization process, Or it is also possible to further have the process of hardening an adhesive layer by heating or irradiating with an ultraviolet-ray simultaneously with the said pressurization process.

  Furthermore, in the solar cell module, the back sheet 6 may be transparent or colored. Furthermore, even when the back sheet 6 is colored, the synthetic resin sheet of the back sheet 6 is not limited to the one containing a pigment as in the above embodiment, and a colored layer is provided on the synthetic resin sheet. Coloring by laminating is also a matter whose design can be changed as appropriate.

  As described above, the present invention can be suitably used for a photoelectric conversion device using solar cells.

DESCRIPTION OF SYMBOLS 1 Solar cell module 2 Solar cell 3 Filler layer 5 Front sheet | seat (sheet main body)
6 Back sheet 8 First layer (adhesive layer)
9 Second layer 10 Solar cell protective sheet 11 Release sheet 13 Solar cell protective sheet roll

Claims (15)

A photovoltaic cell as a photovoltaic element;
A filler layer surrounding the solar cell;
A front sheet disposed on the surface side of the filler layer;
A back sheet disposed on the back side of the filler layer,
A solar cell module in which the filler layer is made of an adhesive.   The solar cell module according to claim 1, wherein the filler layer has a first layer located on a front surface side of the solar battery cell and a second layer located on a back surface side of the solar battery cell.   The solar cell module according to claim 2, wherein the front sheet and the first layer are transparent.   The solar cell module according to claim 3, wherein the second layer is transparent, and the refractive index of the first layer is different from the refractive index of the second layer.   The solar cell module according to claim 4, wherein a relative refractive index of the second layer with respect to the first layer is 0.95 or less or 1.05 or more.   The solar cell module according to claim 2 or 3, wherein the second layer is colored. The front sheet or the back sheet is a flexible film,
The solar cell module according to any one of claims 2 to 6, wherein the first layer and the second layer are formed from pressure-sensitive adhesive layers laminated on the front sheet and the back sheet, respectively.   The solar cell module according to any one of claims 1 to 7, wherein the filler layer is formed of a composition containing an adhesive in a solvent.   The solar cell module according to any one of claims 1 to 8, wherein the filler layer is formed of an acrylic pressure-sensitive adhesive.   The solar cell module according to any one of claims 1 to 9, wherein an average thickness of the filler layer is 30 µm or more and 1 mm or less.   A solar cell protective sheet having a sheet body and an adhesive layer laminated on one surface of the sheet body.   The solar cell protective sheet according to claim 11, wherein the sheet body has flexibility.   The solar cell protective sheet according to claim 11 or 12, wherein the sheet main body and the pressure-sensitive adhesive layer have transparency.   The solar cell protective sheet according to claim 11 or 12, wherein the sheet body or the pressure-sensitive adhesive layer is colored. The process of sticking the adhesive layer of the solar cell protective sheet according to claim 11, claim 12, or claim 14 on one surface of the solar cell,
The process of sticking the adhesive layer of the photovoltaic cell protection sheet of another claim 11, claim 12, or claim 13 on the other surface of the photovoltaic cell, and the pair of photovoltaic cell protection sheets The manufacturing method of the solar cell module which has a process which pressurizes the laminated body of a photovoltaic cell from front and back.

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