JP2009170890A - Flexible film type solar cell multilayer body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible/waterproof film type solar cell multilayer body capable of preventing a decrease in power generation output amount by preventing moisture absorption of a conductive portion. <P>SOLUTION: A solar cell layer 1 is joined on a flexible/waterproof base film material 5, a flexible/adhesive resin layer 9 and a flexible surface protective film layer 10 are formed to successively cover the solar cell layer, and further extended to outside it to be joined on the base film material 5, thereby sealing the solar cell layer. Both anode and cathode conductive portions in the solar cell layer are coated with a conductive portion moisture-proof layer directly or indirectly with a resin layer 9 interposed, and a crosslinking resin layer 6 is formed between the resin layer 9 and film layer 10 when necessary. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a flexible membrane solar cell multilayer. More specifically, the present invention relates to a flexible membrane-like solar cell multilayer body that includes flexible solar cells and is excellent in moisture and water resistance. The flexible membranous solar cell multilayer of the present invention requires a large tent structure, a tent warehouse, a sun tent, a house tent, an agricultural house, a truck hood, which needs to be rolled up or bent and transported or stored. It is useful as a structural member such as a blind.

Solar cells are inexhaustible because their energy source is the sun, and they do not run out of energy sources like fossil energy, so they are expected to be clean energy with the highest contribution to preventing global warming with zero environmental impact. Has been. Amorphous silicon solar cells are advantageous in that they can be made thin and light, have low manufacturing costs, and are easy to increase in area, so that they will become the mainstream of future solar cells. .
Glass substrates are used in conventional solar cells, but flexible solar cells that use plastic films or metal films as substrates in terms of weight reduction, workability, and mass productivity are roll-to-roll that take advantage of their flexibility. Mass production is possible by a roll manufacturing method.
Regarding the use of conventional solar cells in buildings, it is a roof-standing type in which monocrystalline silicon or polycrystalline silicon solar cells are placed on the roof surface, and a method is provided in which a support frame is provided on the roof surface and the solar cells are fixedly supported. However, in recent years, a method of incorporating directly into the roof is being taken. However, since all use modules composed of glass substrates, there are actual problems in terms of workability and workability.

On the other hand, by integrating a film-type flexible solar cell on the upper surface of a polymer sheet such as a vulcanized rubber-based, vinyl chloride-based or asphalt-based non-vulcanized rubber called a roof waterproof sheet, It is being solved. However, in order to obtain the desired flexibility, there is a drawback that the material for protecting the power generating element of the solar cell is limited to the organic material. As a result, moisture resistance, weather resistance, adhesion, and the like may be reduced, and the lifetime of the solar cell may be shortened. As a surface protective material for improving this, a sheet in which a silicon oxide thin film is formed on the surface of a fluororesin film has been proposed. (For example, patent document 1) Moreover, using a transparent polychlorotrifluoroethylene resin film as a surface protection film is proposed. (For example, Patent Document 2)
Various methods have been studied as a method for improving moisture resistance using an organic material, but the film material integrated with the solar cell having the desired flexibility is still insufficient in terms of durability. Currently.

There are various causes for reducing the power generation output of the solar cell, but the following factors are particularly significant.
(1) Moisture absorption of electrode part:
As the electrode portion absorbs moisture, the resistance value increases, and the maximum output operating voltage decreases accordingly. As a result, the power generation output decreases.
Since the solar cell module is configured by arranging at least one unit of solar cells, it is necessary to connect the linear collector electrodes of the anode part and the cathode part of each solar cell. For this purpose, a conductive wire with a conductive adhesive can be attached on the current collecting electrode to provide a conductive wire for output.
Therefore, the moisture absorption of the conductive pressure-sensitive adhesive to the pressure-sensitive adhesive layer increases the resistance value of the electrode part, and as a result, the power generation output is reduced, so that improvement is necessary.
(2) Moisture absorption from the flexible surface protective film layer:
In order to prevent moisture absorption to the solar battery cell, it is common to cover with a surface protective film via an adhesive resin, but the layer after durability test such as moisture resistance test and weather resistance test The adhesion at the interface is reduced, and the power generation output is reduced by moisture absorption from the interface.
Therefore, in particular, it is necessary to improve the adhesion durability between the surface protective film layer and the waterproof film material.
JP-A-10-308521 JP 2006-1000052 A1

  The present invention solves the above-mentioned problems of conventional flexible membrane solar cell structures, has practically sufficient flexibility, has high durability, has little or no moisture absorption in the electrode portion, Moreover, it is an object of the present invention to provide a flexible film-like solar cell laminate having a moisture absorption preventing structure with high adhesion durability.

The flexible membranous solar cell multilayer body of the present invention comprises a flexible and waterproof support film material 5;
The solar cell layer 1 disposed on and joined to the inner side of the flexible and waterproof support membrane material, leaving the peripheral edge,
A flexible surface protective film layer 10 that covers the entire surface of the solar cell layer and that continuously extends to the outside of the solar cell layer and is bonded onto the peripheral edge of the flexible and waterproof support film material;
A flexible / adhesive resin layer 9 in which the entire surface of the solar cell layer covered by the flexible surface protective film layer and the peripheral portion of the flexible / waterproof support film material are bonded to the flexible surface protective film layer. Including
The solar cell layer 1 includes one or more flexible solar cell modules 1A,
Each of the solar cell modules 1 includes one or more solar cells 1a and one current collecting connector 1b.
A pair of anode current collecting electrode 3 and cathode current collecting electrode 4 is disposed on the current collecting connector 1b.
The solar battery cell 1a is connected to the anode current collecting electrode through an anode conductive part 7a, and is connected to the cathode current collecting electrode through a cathode conductive part 7b, and at least the anode conductive part 7a The cathode conductive portion 7 b is covered with the conductive portion moisture-proof layer 8 directly or indirectly through the flexible / adhesive resin layer 9.
In the flexible membranous solar cell multilayer of the present invention, the conductive portion moisture-proof layer 8 is selected from a metal-deposited polyester film, a laminated film of a metal layer and an insulating resin film, and a metal-oxide-deposited polyester film. It is preferably formed of one or more kinds.
In the flexible membranous solar cell multilayer body of the present invention, the flexible surface protective film layer 10 has an area of 120 to 200% of the total surface area of the solar cell layer, and the solar cell layer. It is preferable that the flexible adhesive resin layer that is coated is completely covered, and further extended to the outside to be joined to the flexible / waterproof support film material.
In the flexible membranous solar cell multilayer body of the present invention, the flexible surface protective film layer 10 comprises at least one transparent fluorine-containing resin film, a transparent metal oxide vapor-deposited polyester film, and these. It is preferable to include an ultraviolet blocking adhesive layer bonded to the substrate.
In the flexible membranous solar cell multilayer body of the present invention, the flexible / adhesive resin layer 9 is formed of a film made of a crosslinkable resin of a crosslinkable ethylene-vinyl acetate copolymer, and the solar cell layer It is preferable to cover the entire surface area of at least the surface side of the film, and to extend to the outside and to be joined to the flexible / waterproof support membrane material.
In the flexible membrane solar cell multilayer of the present invention, the flexible / adhesive resin layer 9 further extends between the solar cell layer 1 and the flexible / waterproof support film material 5. The back surface side of the solar cell layer and the flexible / waterproof support film material are preferably bonded.
In the flexible membranous solar cell multilayer of the present invention, the solar cell layer 1 includes a plurality of flexible solar cell modules 1A, and these flexible solar cell modules are separated from each other, It is disposed and bonded on the inner side of the flexible / waterproof support membrane material 5, and the flexible surface protection film layer covers each flexible solar cell module and further extends to the outside. The flexible and waterproof support membrane material is preferably joined.
In the flexible membranous solar cell multilayer body of the present invention, each of the anode conductive portion 7a and the cathode conductive portion 7b is preferably directly covered with the conductive portion moisture-proof layer 8.
In the flexible film-like solar cell multilayer body of the present invention, the conductive portion moisture-proof layer 8 directly covering the anode conductive portion 7a and the cathode conductive portion 7b includes the flexible / adhesive resin layer 9 and the It is preferable to have conductive portion moisture-proof layer extension portions 8f and 8g extending further between the solar cell layer 1 and the movable / waterproof support film material 5, respectively.
In the flexible membrane solar cell multilayer body of the present invention, the conductive portion moisture-proof layer 8 is disposed between the flexible / adhesive resin layer 9 and the flexible surface protective film layer 10. Thus, it is preferable that the anode conductive portion 7 a and the cathode conductive portion 7 b are indirectly covered with the flexible / adhesive resin layer 9.
In the flexible membrane solar cell multilayer body of the present invention, each of the flexible surface protective film layer 10, the flexible / adhesive resin layer 9, and the peripheral portion 5a of the flexible / waterproof support film material. It is preferable that the bonding is made through the crosslinkable adhesive resin layer 6.
In the flexible membranous solar cell multilayer body of the present invention, the crosslinkable adhesive resin layer 6 contains a cured product of one or more crosslinkers selected from an epoxy resin, an isocyanate compound, and a coupling agent compound. It is preferable.
In the flexible membrane solar cell multilayer of the present invention, the crosslinkable adhesive resin layer 6 is an acrylic resin containing a primary amino group, or a fluoroolefin-vinyl copolymer containing a hydroxyl group and a carboxyl group. It is preferable to include any one of united resins.

  The flexible film-like solar cell laminate of the present invention has practically sufficient flexibility, and also when used in a high-temperature and high-humidity environment and when used outdoors for a long period of time, an output conductor portion. Therefore, it is possible to prevent moisture from being absorbed by the other power generation elements of the solar battery cell, and therefore, an effect of preventing a decrease in power generation output can be achieved.

As shown in FIGS. 1 (A) and 1 (B), the flexible membrane solar cell multilayer of the present invention has a flexible / waterproof support film material 5 and the flexible / waterproof material. Covering the entire surface of the solar cell layer 1 disposed and bonded on the inner side, leaving the peripheral edge of the support film material, and further continuously extending to the outer side, A flexible surface protective film layer 10 bonded on a peripheral edge of a flexible / waterproof support film material, and the flexible solar cell layer covered by the flexible surface protective film layer And the flexible / adhesive resin layer 9 that adheres the peripheral edge of the flexible / waterproof support membrane material, preferably as shown in FIG. 1- (B) As shown in the figure, each of the flexible surface protective film layer 10, the flexible / adhesive resin layer 9, and the peripheral portions of the flexible / waterproof support membrane material, respectively. Bonding have been made through a crosslinking adhesive resin layer 6 with.
The flexible surface protective film layer, the crosslinkable adhesive resin layer 6 and the flexible / adhesive resin layer 9 all transmit sunlight.

  1 (A), (B) and FIG. 2, the solar cell layer 1 has one or a plurality of (one in FIG. 1 (A) and plural in FIG. 2) flexible solar cells. The flexible solar cell module includes a battery module 1A, and each of the flexible solar cell modules includes one (FIG. 1- (A)) or a plurality of (FIG. 2) solar cells 1a and one current collecting connector 1b. The solar battery cell 1a includes a large number of comb-like electrodes 2, and the current collecting connector 1b is provided with a pair of an anode current collecting electrode 3 and a cathode current collecting electrode 4, and the solar cell The battery cell 1a is connected to the anode current collecting electrode 3 through an anode conductive part 7a, and is connected to the cathode current collecting electrode 4 through a cathode conductive part 7b. The positive and negative current collecting electrodes of the current collecting connector 1b are connected to an anode terminal and a cathode terminal (not shown) arranged on the front surface side or the back surface side of the flexible / waterproof support membrane material 5, respectively. Has been.

  1- (A) and (B), the solar cell layer 1 is disposed on and joined to the inner side of the flexible / waterproof support film material 5, leaving the peripheral edge. The flexible surface protective film layer 10 covers the entire surface of the solar cell layer 1, extends further to the outside, and is bonded onto the peripheral edge of the flexible / waterproof support film material 5. At this time, the flexible surface protective film layer 10 is bonded to the peripheral portions of the solar cell layer 1 and the flexible / waterproof support film material 5 via the flexible / adhesive resin layer 9. Further, a crosslinkable resin layer 6 is formed between the flexible surface protective film layer 10 and each of the peripheral portions of the flexible / adhesive resin layer 9 and the flexible / waterproof support film material 5. It is preferable.

  1- (A) and (B), the flexible solar cell 1a is preferably a film-like amorphous silicon solar cell, and the conductive material constituting the positive / negative bipolar conductive portions 7a, 7b. Although there is no particular limitation, a tin-plated copper wire is usually used. The thickness of each conductive part is preferably 0.02 to 1 mm. In particular, in order to have good flexibility and flexibility, the thickness is preferably 0.05 to 0.5 mm. preferable. In addition, the back surfaces of the positive and negative electrode conductive portions 7a and 7b are bonded and fixed to the solar battery cell 1a and the current collecting connector 1b so that current can be supplied. In order to connect to a conductive adhesive, it is preferable to use a conductive adhesive in a continuous layer form.

  The positive and negative electrode conductive portions 7a and 7b are directly or completely covered by the conductive portion moisture-proof layer 8 having excellent moisture resistance or indirectly through the flexible / adhesive resin layer 9, thereby A decrease in current collection efficiency due to moisture absorption can be prevented or reduced. The positive and negative electrode current collecting electrodes are also preferably covered with a moisture-proof layer.

In the flexible membrane solar cell multilayer body of the present invention, the solar cell layer can include two or more flexible solar cell modules. In this case, one flexible / waterproof support membrane material Two or more flexible solar cell modules arranged and bonded on the inner side are covered with a common flexible surface protection film layer, and a continuous flexible / adhesive resin layer and, if necessary, an intermediate layer. A crosslinkable resin adhesive layer may be disposed.
Further, as shown in FIG. 2, two or more flexible solar cell modules 1A are arranged on the inner side of one flexible / waterproof support membrane material 5 so as to be separated from each other. Each of the two or more flexible solar cell modules 1A is bonded and covered with one flexible surface protection film layer 10, and the flexible surface protection film layer is further formed into a flexible solar cell module. It may be extended to the outside and bonded onto the flexible / waterproof support membrane material 5. In this case, a flexible / adhesive resin layer and, if necessary, a crosslinkable resin adhesive layer are formed between the flexible solar cell module 1A and the flexible surface protective film layer covering the flexible solar cell module 1A. If it does in this way, in the obtained flexible film | membrane solar cell multilayer body, favorable flexibility will be obtained in the intermediate part of several flexible solar cell module 1A arrange | positioned mutually spaced apart. Is possible.

  The conductive portion moisture-proof layer is formed by directly or indirectly covering the peripheral surfaces of the positive and negative bipolar conductive portions 7a and 7b with a moisture-proof film. The structural example of a moisture-proof film is shown to Fig.3- (a), (b) and (c).

Further, using the moisture-proof film shown in FIGS. 3 (a), (b) and (c) alone or in combination, 1). FIG. 5 shows a configuration example in which the conductive portion moisture-proof layer 8 is formed on each of the anode conductive portion 7a and the cathode conductive portion 7b by covering only the peripheral surfaces of the positive and negative electrode conductive portions 7a and 7b, and 2). An extension that covers the peripheral surfaces of the positive and negative electrode conductive portions 7a and 7b, covers the entire surface of the solar cell layer 1, and extends to the surface of the flexible / waterproof support film material 5 to cover it. FIG. 6 shows a configuration example of the continuous conductive portion moisture-proof layer 8 having the portions 8f and 8g, and 3). Continuously covering the peripheral surfaces of the positive and negative electrode conductive portions 7a and 7b, covering the entire surface of the solar cell layer 1, and extending to the surface of the flexible / waterproof support film material 5 FIG. 7 shows a configuration example of the continuous conductive portion moisture-proof layer 8 that covers the entire surface of the flexible / adhesive resin layer 9 and indirectly covers the positive / negative bipolar conductive portions 7a and 7b. The moisture-proof film for the conductive part moisture-proof layer 8 shown in FIG. 3A is composed of a polyester film 8a and a metal vapor-deposited layer 8b.
The metal deposited on the polyester film is preferably selected from aluminum, tin, titanium, indium, silicon, magnesium, iron, zinc, zirconium, cobalt, chromium, nickel and the like. Moreover, as a means for forming the metal vapor deposition layer, any of vacuum vapor deposition method, sputtering method, ion plating method, various CVD methods and the like can be used. It can be preferably used. The thickness of the metal vapor deposition layer is preferably 5 to 500 nm, and more preferably 10 to 200 nm.

The moisture-proof film for the conductive portion moisture-proof layer 8 shown in FIG. 3B is obtained by sticking a metal foil 8c to an insulating resin film 8d. As this metal foil, gold, silver, platinum, palladium, aluminum, copper, stainless steel and the like can be preferably used. Moreover, as an insulating resin film, a general thermoplastic resin film or a thermosetting resin film can be used. As the thermoplastic resin film, films such as polyvinyl chloride resin, polyethylene resin, polystyrene resin, ABS resin, acrylic resin, polypropylene resin, polycarbonate resin, polyamide resin, polyacetal resin, polybutyl terephthalate resin are preferably used. On the other hand, as the thermosetting resin, a film such as a phenol resin, a urea resin, a melamine resin, an epoxy resin, or a polyurethane resin can be preferably used. In order to strengthen the adhesiveness between the metal foil and the insulating resin film, urethane resin, polyester resin, epoxy resin, acrylic resin or the like can be used as an adhesive. Furthermore, adhesiveness with metal foil can be improved by performing pre-treatments such as corona treatment, ozone treatment, and plasma treatment on the insulating resin film.
The thickness of the metal foil is preferably 1 to 100 μm, and more preferably 10 to 50 μm.

The moisture-proof film for the conductive portion moisture-proof layer 8 shown in FIG. 3C is obtained by depositing a metal oxide deposition layer 8e on the polyester film 8a. In this case, oxides of metals such as silicon, aluminum, magnesium, calcium, potassium, sodium, boron, titanium, zirconium, and yttrium can be used as metal oxides deposited on the polyester film. In particular, silicate oxide, aluminum oxide, and magnesium oxide are preferable.
As the means for forming the vapor deposition layer, any of vacuum vapor deposition, sputtering, ion plating, various CVD, and the like can be used, and in particular, vacuum vapor deposition, sputtering, and CVD can be preferably used. . The thickness of the metal oxide vapor deposition layer is preferably 5 to 500 nm, and more preferably 10 to 200 nm.
The above moisture-proof film is used for moisture-proof coating of the positive and negative current collecting electrodes, for moisture-proof coating of the solar cells, and for covering the positive and negative current collecting electrodes and the solar cells collectively. It is preferable that it has light transmittance.

  As the flexible / adhesive layer resin for forming the flexible / adhesive resin layer 9, it is preferable to use a crosslinkable ethylene-vinyl acetate copolymer composition. An ethylene-vinyl acetate polymer resin having a vinyl acetate constituent unit content of 1 to 40 mol%, preferably 10 to 35 mol%, can be used with a good balance in terms of weather resistance, transparency and mechanical properties of the resin. . In addition, a crosslinkable ethylene-vinyl acetate copolymer resin composition is blended with a crosslinking agent to improve the weather resistance, so that it has a crosslinked structure. Generally, the crosslinking agent generates radicals at 100 ° C. or higher. An organic peroxide can be preferably used. Examples of such organic peroxides include benzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-di (t-butylperoxy) hexane, 1,1'-di-t-butylperoxy-3,3, 5-trimethylenecyclohexane, 1,3-di- (t-butylperoxy) -diisopropylbenzene and the like can be used. Generally the compounding quantity of these organic peroxides is 5 weight part or less with respect to 100 weight part of ethylene-vinyl acetate copolymer resin, Preferably it is 1-3 weight part. The flexible / adhesive resin melts at a temperature of 120 to 170 ° C. under a pressure of 1 Torr or less, fills a gap space between the solar cell layer and the flexible surface protective film layer, and cures by crosslinking. be able to.

Further, the flexible / adhesive resin layer covers the entire surface area of at least the surface side of the solar cell layer and extends to the outside to be bonded to the flexible / waterproof support film material. Is preferred. In the aspect in which the flexible / adhesive resin layer covers only the surface side of the solar cell layer, the surface area of the flexible / adhesive resin layer is 105 to 150% of the total surface area of the solar cell layer. Is preferred. The surface side area of the flexible / adhesive resin layer and the surface area of the solar cell layer mean areas in respective plan views.
If the area of the flexible / adhesive resin layer is less than 105% of the total surface area on the surface side of the solar cell layer, the covering protection of the solar cell layer by the flexible / adhesive resin layer may be incomplete. In this case, moisture absorption occurs in the incompletely coated portion of the solar cell layer, and the moisture-absorbing power generation element of the solar battery cell has an influence due to moisture absorption, for example, an increase in internal resistance, thereby reducing the power generation output. The flexible / adhesive resin layer covers the entire surface of the surface side and the back side of the solar cell layer, and each has an area of 105 to 150% of the total surface area of the solar cell layer. Further, it is preferable to extend outward and to be joined to the flexible / waterproof support membrane material. In this case, if the area of the flexible or adhesive resin layer on the front surface side or the back surface side is less than 105% of the surface area of the solar cell layer, the covering protection of the solar cell layer may be incomplete, Even in this case, moisture absorption occurs in the incompletely coated portion of the solar cell layer, and the moisture-absorbing power generation element of the solar battery cell has an influence due to moisture absorption, for example, an increase in internal resistance, thereby reducing the amount of power generation output. . Further, when moisture contacts the solar battery cells for a long time, the power generation element may be deteriorated. When the area ratio is larger than 150%, the area of the flexible / adhesive resin layer is larger than the area of the flexible surface protective film layer and is exposed to the outside of the flexible surface protective film layer. The flexible / adhesive resin layer may be contaminated with dust or the like to deteriorate the appearance of the product.
When the solar cell layer includes a plurality of flexible solar cell modules and these modules are arranged apart from each other and each of them is coated independently of each other, the flexible / waterproof resin layer The preferable surface area is preferably adjusted to be 105 to 150% of the total surface area of each module.

The flexible surface protective film layer is preferably formed of a transparent fluororesin film. Such transparent fluororesin for film formation includes vinyl fluoride, vinylidene fluoride, ethylene trifluoride, ethylene trifluoride, tetrafluoroethylene, propylene hexafluoride, fluoroalkyl vinyl ether and ethylene. One monomer polymer resin selected from the group or two or more monomer copolymer resins can be used. In particular, it is preferable to use ethylene trifluoride chloride having excellent moisture resistance.
The thickness of the flexible surface protective film layer is preferably 0.03 to 0.5 mm, more preferably 0.05 to 0.3 mm. If the thickness is less than 0.03 mm, moisture resistance may be insufficient, and if it exceeds 0.5 mm, flexibility may be insufficient. The light transmittance of the flexible surface protective film layer is preferably 80% or more. If it is less than 80%, the power generation output may be reduced.

  The flexible surface protective film layer 10 has an area of 120 to 200% of the total surface area of the solar cell layer, and completely covers the flexible adhesive resin layer covering the solar cell layer. It is preferable that the film is further coated on the outer surface of the flexible and waterproof support membrane material. The areas of the flexible surface protective film layer and the solar cell layer mean areas in respective plan views. When the area of the flexible surface protective film layer is less than 120% of the total surface area of the solar cell layer, the covering of the solar cell layer and the flexible / adhesive resin layer with the flexible surface protective film layer is incomplete. In addition, the bonding with the flexible / waterproof support membrane material may be insufficient, which causes the solar cell module to absorb moisture, increase the internal resistance of the power generation element, and decrease the power generation output. May occur. Moreover, when it becomes larger than 200%, the flexible surface protective film layer will excessively cover the flexible / waterproof support membrane material, and as a result, the flexible membrane-like solar cell multilayer obtained is Sewing may be difficult. For this reason, it is preferable that the peripheral part which needs to sew a flexible and waterproof support film | membrane material remains the part which is not coat | covered with the flexible surface protection film layer.

  As the film for forming the flexible surface protective film layer 10, it is preferable to use a transparent fluororesin film 11 as shown in FIG. As shown in (b), a transparent metal oxide vapor-deposited polyester in which a transparent metal oxide vapor-deposited layer 14 is formed on one side of a polyester film 13 on one side of a transparent fluororesin film 11. The film 15 is joined and integrated through a transparent adhesive layer 12 having an ultraviolet blocking effect so that the transparent metal oxide deposition layer 14 faces the transparent fluororesin film layer 11. It is preferable to use a conductive film. It is preferable that the flexible surface protective film layer formed from the laminated structure film including such a metal oxide vapor-deposited layer also has a light transmittance of 80% or more. When the light transmittance is less than 80%, the power generation output of the obtained flexible film-like solar cell multilayer body may be insufficient.

  As the adhesive for the ultraviolet blocking transparent adhesive layer 12 of the flexible surface protective film layer 10 shown in FIG. 4- (b), a polyurethane resin, a polyester resin, an epoxy resin, an acrylic resin, or the like is used. Can do. Moreover, the adhesiveness of the transparent fluororesin film 11 may be improved by applying a corona discharge treatment, an ozone treatment, or a plasma discharge treatment. Further, in order to prevent the ultraviolet degradation of the transparent metal oxide vapor-deposited polyester film 13, the adhesive for the transparent adhesive layer 12 contains an ultraviolet absorber. As the ultraviolet absorber, an ultraviolet absorbing inorganic compound such as titanium oxide, zinc oxide or cesium oxide can be used. The particle size of these inorganic compounds is preferably 0.1 μm or less in order to maintain high transparency of the flexible surface protective film layer. Moreover, as an organic compound for ultraviolet absorbers, benzophenone-based, benzotriazole-based, oxalic acid anilide-based, cyanoacrylate-based, and triazo-based ultraviolet absorbers can be used. The inorganic ultraviolet absorber and the organic ultraviolet absorber can further enhance the ultraviolet blocking effect by using these in combination.

  In the flexible membranous solar cell multilayer body of the present invention, as shown in FIG. 1- (B), the flexible surface protective film layer 10, the flexible / adhesive resin layer 9, and It is preferable that the flexible and waterproof support membrane material be joined to each of the peripheral portions via the crosslinkable adhesive resin layer 6. The crosslinkable adhesive resin includes an adhesive resin component and a crosslinker component, and an epoxy compound, an isocyanate compound, a coupling agent compound, or the like is used as the crosslinker.

  Examples of the epoxy compound for the crosslinking agent include bisphenol A, epichlorohydrin type epoxy resin, ethylene glycol glycidyl ether, polyethylene glycol glycidyl ether, glycerin glycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylol. Propane triglycidyl ether, diglycidyl aniline, diglycidyl amine, N, N, N ′, N′-tetraglycidyl-m-xylenediamine, and 1,3-bis (N, N′-diglycidylaminomethyl) cyclohexane Can be used. An epoxy resin obtained by modifying the above epoxy resin with a chelating agent, urethane resin, synthetic rubber or the like can also be used.

  Examples of the isocyanate compound for the crosslinking agent include aliphatic diisocyanates such as hexamethylene diisocyanate and lysine diisocyanate; alicyclic diisocyanates such as isophorone diisocyanate and hydrogenated tolylene diisocyanate; aromatic diisocyanates, For example, tolylene diisocyanate, diphenylmethane diisocyanate, and xylene diisocyanate; isocyanurates such as tris (hexamethylene isocyanate) isocyanurate and tris (3-isocyanate methylbenzyl) isocyanurate; Block isocyanates blocked with blocking agents such as phenols, oximes, alcohols and lactams It is preferable to use, and the like.

Further, as a coupling agent compound used as a crosslinking agent for the crosslinkable adhesive resin, a silane coupling agent, a titanium coupling agent, a zirconium coupling agent, an aluminum coupling agent, and a zircoaluminum coupling are used. At least one selected from agents can be used. Examples of the silane coupling agent include aminosilanes such as γ-aminopropyltriethoxysilane and N-phenyl-γ-aminopropyltriethoxysilane; epoxy silanes such as γ-glycidoxypropylmethyldiethoxy. Silane, γ-glycidoxypropyltrimethoxysilane, and β- (3,4 epoxycyclohexyl) ethyltrimethoxysilane; vinyl silanes such as vinyltriethoxysilane and vinyltris (β-methoxyethoxy) silane; mercapto Silanes such as γ-mercaptopropyltrimethoxysilane are exemplified.
Titanium-based coupling agents include alkoxy compounds such as tetraisopropoxy titanium, tetra-n-butoxy titanium, and tetrakis (2-ethylhexoxy) titanium; acylates such as tri-n-butoxy titanium stearate, and Examples include isopropoxy titanium tristearate. Examples of the zirconium-based coupling agent include tetrabutyl zirconate, tetra (triethanolamine) zirconate, and tetraisopropyl zirconate. Examples of the aluminum coupling agent include acetoalkoxyaluminum diisopropylate. Furthermore, examples of the zircoaluminum-based coupling agent include tetrapropylzircoaluminate. Among these coupling agents, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, and β- (3,4 epoxy cyclohexyl) are particularly preferred from the viewpoint of moisture resistance and light resistance. It is preferable to use an epoxy silane such as ethyltrimethoxysilane.

  The amount of the crosslinking agent contained in the crosslinkable adhesive resin layer is preferably in the range of 0.5 to 30% by mass with respect to the total mass of the crosslinkable adhesive resin layer. If the content of the crosslinking agent is less than 0.5% by mass, the water resistance and adhesiveness of the resulting crosslinkable adhesive resin layer may be insufficient. Moreover, when it exceeds 30 mass%, the crosslinkable adhesive resin layer obtained will become hard, and the flexible flexibility of the flexible film-like solar cell multilayer body obtained may become inadequate.

The adhesive resin component in the crosslinkable adhesive resin layer is composed of either one of an acrylic resin containing a primary amino group or a fluoroolefin-vinyl copolymer resin containing a hydroxyl group and a carboxyl group. It is preferable. Among acrylic resins having a primary amino group, those in which a primary amino group is introduced by ring-opening addition of ethyleneimine to the carboxyl group of the acrylic resin are particularly preferred in terms of reactivity and adhesiveness. Moreover, in the fluoroolefin-vinyl copolymer resin containing a hydroxyl group and a carboxyl group, a trifluoroethylene-vinyl copolymer resin is particularly preferable in terms of reactivity and durability.
Furthermore, adhesiveness with a crosslinkable adhesive resin can be improved by pre-treating the surface protective film layer by corona treatment, ozone treatment, plasma treatment or the like.

The flexible and waterproof support film material 5 of the flexible membrane-like solar cell multilayer body of the present invention is made of a flexible and waterproof sheet, and has a thickness of 0.1 to 3.0 mm and 150. It is preferable to have a mass (unit weight) per unit area of ˜2500 g / m ² . The flexible / waterproof sheet may contain a fiber fabric (woven fabric, knitted fabric or non-woven fabric) as a base fabric if necessary. In this case, it is preferable that a flexible / waterproof resin layer is formed by applying or impregnating a flexible / waterproof synthetic resin on at least one surface, preferably both surfaces, of the fiber cloth. The fibers forming the fiber fabric for the base fabric include natural fibers such as cotton and hemp, inorganic fibers such as glass fibers, carbon fibers and metal fibers, recycled fibers such as viscose rayon and cupra, and the like. Synthetic fibers such as di- and triacetate fibers, etc., and synthetic fibers such as polyamide fibers such as nylon 6 and nylon 66, aramid fibers such as Kevlar, polyester fibers (saturated polyester) such as polyethylene terephthalate and polyethylene naphthalate, and poly At least one selected from fatty acid polyester fibers such as lactic acid fibers, polyarylate fibers, aromatic polyether fibers, polyimide fibers, acrylic fibers, vinylon fibers, polyethylene fibers, polypropylene fibers such as polypropylene fibers, and polyvinyl chloride fibers Use what consists of It is possible. The fiber material forming the fiber fabric may have any shape such as short fiber spun yarn, long fiber yarn shape, split yarn, tape yarn or the like. The structure of the fibrous base fabric may be any of a woven fabric, a knitted fabric, a nonwoven fabric, or a composite thereof.

  Examples of flexible and waterproof resins for flexible and waterproof support membrane materials include polyvinyl chloride resins, polyolefin resins, chlorinated polyolefin resins, ethylene-vinyl acetate copolymer resins, and ethylene- (meth) acrylic esters. Copolymer resin, ionomer resin (ethylene- (meth) acrylic acid copolymer salt, etc.), polyurethane resin, polyester resin (including aliphatic polyester resin), acrylic resin, fluorine-containing resin , Styrene copolymer resin (styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, and hydrogenated products thereof), polyamide resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer Combined resins, silicone resins, and other synthetic resins (including thermoplastic elastomers) ) It is possible to choose from, and the like. These waterproof synthetic resins may be used alone or as a mixture of two or more.

  The surface of the flexible / waterproof support membrane material may be covered with an antifouling layer. The antifouling layer is formed of a resin film having antifouling properties. Examples of the antifouling resin include fluorine resins, acrylic resins, urethane resins, olefin resins, ionomer resins, ethylene-vinyl acetate copolymer resins, ethylene-vinyl alcohol copolymer resins, polyvinyl resins. At least one synthetic resin selected from alcohol resins, polyvinyl butyral resins, cellulose resins, polyester resins, polycarbonate resins, polyamide resins, silicone resins, acrylic-silicone resins, and the like can be used. . In the present invention, it is preferable to use at least one selected from a fluororesin and an acrylic resin.

In another embodiment of the flexible / adhesive resin layer in the flexible membranous solar cell multilayer body of the present invention,
As shown in FIG. 5, the flexible / adhesive resin layer 9 extends between the solar cell layer 1 and the flexible / waterproof support film material 5, and the solar cell layer. And the flexible / waterproof support membrane material. In this way, by adhering the back side of the solar cell layer and the flexible / waterproof support film material by a part of the flexible adhesive resin layer, the solar cell layer is placed on the flexible / waterproof support film material. It can be firmly bonded and protected.

  In another embodiment of the conductive portion moisture-proof layer 8 of the flexible membranous solar cell multilayer body of the present invention, as shown in FIG. 6, the anode conductive portion 7a and the cathode conductive portion 7b are directly covered. The conductive portion moisture-proof layer 8 further extends between the flexible / adhesive resin layer 9 and each of the flexible solar cell module 1A and the flexible / waterproof support film material 5, thereby Part moisture-proof layer extended portions 8f and 8g. In this case, the two conductive portion moisture-proof layers 8 directly covering the anode and cathode conductive portions 7a and 7b, the intermediate conductive portion moisture-proof layer extension portion 8f formed in the middle of these, and the 2 On the outside of each conductive portion moisture-proof layer 8, there is one flexible surface protective film layer and a left and right conductive portion moisture-proof layer extended portion 8g extending to the joint between the flexible and waterproof support film material 5. The anode and cathode conductive portions 7a and 7b and the solar cell module 1A can be completely covered, thereby improving the moisture-proof effect on the solar cell module 1A. In FIG. 6, the end portion of the left and right conductive portion moisture-proof layer extension portion extends into the joint portion of the flexible / waterproof support member 5, the flexible surface protective film layer 10 and the crosslinkable adhesive resin layer 6. However, the flexible / waterproof support membrane material 5 and the flexible surface protective film layer 10 may be joined via a crosslinkable adhesive resin layer 6 extending therebetween, or flexible. The waterproof support film material 5 may be directly bonded to both ends of the flexible surface protective film layer 10 and the crosslinkable adhesive resin layer 6.

In still another aspect of the conductive portion moisture-proof layer 8 of the flexible membrane-like solar cell multilayer body of the present invention, as shown in FIG. 7, the solar cell layer on the flexible and waterproof support film material 5 1 and anode and cathode conductive portions 7a and 7b are covered with a flexible / adhesive resin layer 9, and a conductive portion moisture-proof layer 8 is formed thereon, and the anode and cathode conductive portions 7a and 7b are flexible. A moisture-proof coating is indirectly applied by the conductive portion moisture-proof layer 8 through the adhesive resin layer 9. By doing in this way, the electroconductive part moisture-proof layer 8 which coat | covers the anode and cathode electroconductive part 7a, 7b and the solar cell module 1 can be easily formed using a moisture proof film.
In FIG. 7, the left and right end portions of the conductive portion moisture-proof layer 8 extend into the joint portion between the flexible waterproof support film material, the flexible surface protective film layer 10 and the crosslinkable adhesive resin layer 6. The flexible waterproof support membrane material may be joined to the end of the flexible surface protective film layer 10 via the end of the crosslinkable adhesive resin layer 6 extending between them, or The flexible surface protective film layer 10 and the crosslinkable adhesive resin layer 6 may be bonded to the respective terminals.

  The flexible membrane solar cell multilayer of the present invention will be further described by the following examples.

Battery multilayers produced in the following examples and comparative examples were subjected to the following tests.
(1) Power generation output measurement Based on JIS-C8935-1995, the power generation output of the specimen before and after an environmental test was measured.
(2) Moisture resistance Measure the power output retention rate (%) after leaving the specimen in an environment of 85 ° C and 85% RH for 1000 hours, and the appearance (hue, film peeling, floating, etc.) Evaluation was made in four stages as follows.
(Appearance evaluation)
4: No change compared to the state before the start of measurement.
3: Coloring is slightly seen.
2: Yellowing is observed, and the film (flexible surface protective film layer) is lifted and peeled off on a part of the specimen.
1: Yellowing is recognized, and the film floats and peels over the entire surface of the specimen.
(3) Weather resistance Using a metal weather ultra-accelerated weathering tester on the specimen, measure the power generation output retention rate after UV irradiation under the following conditions, and the appearance (hue, film peeling, floating, etc.) is as follows: It was rated in 4 grades.
(Test conditions)
UV intensity: 50 (mW / cm ² )
L time (light); temperature 60 ° C, humidity 39%, set time 4 hours D time (condensation); temperature 60 ° C, humidity 90% or more, set time 4 hours 1 hour total time of L time and D time 8 hours As a result, a total of 10 units and 1200 hours of irradiation were performed with a total of 15 cycles (120 hours) taken as one unit of test time.
(Appearance evaluation)
4: No change compared to the state before the start of measurement.
3: Coloring is slightly seen.
2: Yellowing is observed, and the film (flexible surface protective film layer) is lifted and peeled off on a part of the specimen.
1: Yellowing is recognized, and the film floats and peels over the entire surface of the specimen.

Example 1
A flexible solar cell module in which 10 solar cells each having a unit cell size of 260 mm in width and 80 mm in length are arranged in series and combined with one current collector connector is 1000 mm in width and long. The flexible and waterproof support membrane material having a thickness of 1500 mm was laminated and joined together through the following adhesive resin.
As the adhesive resin, a coupling agent compound (for example, an epoxy silane coupling agent) and an acrylic resin crosslinked with an epoxy resin (for example, urethane-modified epoxy resin) were used.

Further, as a fiber fabric for the base fabric of the flexible and waterproof support membrane material, a base fabric plain weave (weight per unit: 160 g / m ² ) using polyester fiber yarn (fiber thickness: 84 dtex) for warp and weft, density: 40 warps / 25.4 mm, 50 wefts / 25.4 mm) were used. Further, the following flexible / waterproof resin film was attached to the base fabric of the flexible / waterproof support membrane material.
As a flexible and waterproof resin film, the following polyvinyl chloride resin composition was kneaded and rolled by a calendering method to produce a film having a thickness of 0.15 mm. This film was thermocompression bonded on the surface of the base fabric at 165 ° C. for 2 minutes to produce a flexible / waterproof support membrane material. The basis weight of this film material was 500 g / m ² .
The surface of the flexible / waterproof support membrane material was coated with a vinylidene fluoride resin solution to form an antifouling layer having a thickness of about 10 μm.
Vinyl chloride resin 100 parts by weight Phthalate ester plasticizer 50 parts by weight Phosphate ester plasticizer 15 parts by weight Epoxy compound 3 parts by weight Ba-Ca stabilizer 1 part by weight Aromatic isocyanate compound 5 parts by weight Benzotriazole UV Absorber 0.1 parts by weight Pigment (titanium oxide) 5 parts by weight

  As the solar cell, a flexible cell in which an amorphous silicon solar cell was laminated on a film substrate was used.

The positive and negative electrode conductive parts of the flexible solar cell module were entirely covered with an aluminum vapor-deposited polyester film (thickness 50 μm, thickness of the aluminum vapor-deposited layer: 60 nm) for forming a conductive part moisture-proof layer.
Using a flexible / adhesive resin layer having a thickness of 0.6 mm, a width of 300 mm, and a length of 890 mm, a crosslinkable ethylene-vinyl acetate copolymer resin sheet (having an area of 120% of the solar cell layer area) Formed.
A flexible surface protection sheet layer is formed using a fluorine-based resin film (corresponding to an area of 150% of the solar cell area) having a thickness of 50 μm, a width of 340 mm, and a length of 970 mm, and the surface protection film layer A cross-linkable adhesive resin was applied to the back surface.
In addition, a trifluoroethylene chloride film was used as the surface protective film. In addition, as a pretreatment, a corona treatment was performed to improve adhesion.
As a crosslinkable adhesive resin, an acrylic resin containing a primary amino group crosslinked by a crosslinking agent including an epoxy resin (for example, a urethane-modified epoxy resin) and a coupling agent compound (for example, an epoxy silane coupling agent) Resin was used.
This crosslinkable adhesive resin solution was subjected to corona treatment on the back side of the ethylene trifluoride chloride film and then subjected to gravure coating to form an adhesive layer having a thickness of 10 μm after drying.

The solar cell layer disposed and bonded to the central portion of the flexible / waterproof support membrane material is covered with the crosslinkable ethylene-vinyl acetate copolymer resin sheet for the flexible / adhesive resin layer, and this solar cell layer The peripheral edge of the sheet extending outside is bonded onto a flexible / waterproof support membrane material, and the fluororesin film for a flexible surface protective film with a crosslinkable adhesive resin layer is formed on the crosslinkable film. An adhesive resin layer is coated so as to be in contact with the flexible / adhesive resin layer, and the peripheral edge of the film extending to the outside of the flexible / adhesive resin layer is allowed to pass through the crosslinkable adhesive resin layer. Bonded on flexible and waterproof support membrane material.
The laminated body formed as described above is heated under vacuum at a temperature of 160 ° C. and a vacuum of 1 Torr for 10 minutes so that all the layers are bonded and integrated to form a flexible membrane solar cell multilayer body. Was prepared and used for the test.
By the vacuum heating, the crosslinkable ethylene-vinyl acetate copolymer resin sheet for the flexible / adhesive resin layer is melted, and the solar cell layer and the crosslinkable adhesive resin layer under the flexible surface protective film layer The gap space was filled and crosslinked and cured.
The test results are shown in Table 1.

Example 2
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, the flexible surface protective film layer was formed using an ethylene-tetrafluoroethylene copolymer film (thickness 50 μm) having an area of 150% of the area of the solar cell layer.
The test results are shown in Table 1.

Example 3
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, the flexible surface protective film layer was formed using a polyvinyl fluoride film (thickness 50 μm) having an area of 150% of the area of the solar cell layer.
The test results are shown in Table 1.

Example 4
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, the flexible surface protective film layer has an area of 150% of the area of the solar cell layer, and a polyvinylidene fluoride film ((thickness: 50 μm) is coated with a silicon oxide-deposited polyester film (thickness: 12 μm). It was formed using a laminated film obtained by laminating via an acrylic adhesive containing a benzotriazole ultraviolet absorber.
The test results are shown in Table 1.

Example 5
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, as the crosslinkable adhesive resin, a 3-fluoroethylene chloride-vinyl copolymer resin containing a hydroxyl group and a carboxyl group crosslinked with an epoxy silane coupling agent and a blocked isocyanate compound was used.
The test results are shown in Table 1.

Example 6
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, as the moisture-proof film for the conductive part moisture-proof layer, a laminated film obtained by laminating and sticking an aluminum foil having a thickness of 50 μm to a polyvinyl chloride resin film having a thickness of 100 μm via an acrylic adhesive was used.
The test results are shown in Table 1.

Example 7
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, ethylene-vinyl acetate formed by kneading and rolling the composition of the following composition on the surface of the same polyester fiber plain weave base fabric as in Example 1 as a flexible and waterproof support membrane material by a calendar molding method A film material (weight per unit area: 500 g / m ² ) produced by laminating a copolymer resin composition film (thickness 0.17 mm), pressurizing and pressing at 130 ° C. for 2 minutes was used.
(Ethylene-vinyl acetate copolymer resin composition)
Ethylene-vinyl acetate copolymer resin 100 parts by weight Stabilizer (phenolic compound) 0.5 part by weight Pigment (titanium oxide) 5 parts by weight The test results are shown in Table 1.

Example 8
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, the front and back surfaces of the solar cell layer are covered with a crosslinkable ethylene-vinyl acetate copolymer resin sheet (having an area of 120% of the solar cell layer area) having a thickness of 0.6 mm, a width of 300 mm, and a length of 890 mm. And the flexible and adhesive resin layer was provided on both surfaces of the solar cell layer. The test results are shown in Table 1.

Example 9
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, partial aluminum vapor deposition polyester film coating of the anode conductive part and the cathode conductive part was omitted. Instead, the anode / cathode conductive portion is formed by forming the positive / negative bipolar conductive portion coating layer as a silicon oxide vapor-deposited polyester film (width 300 mm, length 890 mm, thickness 50 μm, thickness of the silicon oxide vapor-deposited layer: 60 nm). And covering the entire surface of the solar cell (having an area of 120% of the solar cell layer area), and further forming a continuous coating layer extending to the surface of the flexible and waterproof support film material A moisture-proof layer was formed. The test results are shown in Table 1.

Example 10
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, a partial aluminum vapor deposition polyester film coating of the anode conductive portion and the cathode conductive portion is omitted, and a crosslinkable ethylene-vinyl acetate copolymer resin sheet (solar cell layer) having a thickness of 0.6 mm, a width of 300 mm, and a length of 890 mm And a flexible / adhesive resin layer is formed on the entire surface of the flexible / adhesive resin layer (300 mm in width, 890 mm in length, A conductive portion moisture-proof layer was provided to indirectly cover and moisture-proof the anode conductive portion and the cathode conductive portion by providing a thickness of 50 μm and a thickness of the silicon oxide vapor deposition layer: 60 nm. The test results are shown in Table 1.

Comparative Example 1
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, the positive and negative electrode conductive portions were not coated with the conductive portion moisture-proof layer.
The test results are shown in Table 1.

Reference example 1
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, the area of the flexible / adhesive resin layer composed of the crosslinkable ethylene-vinyl acetate copolymer resin sheet was made the same as the total surface area of the solar cell layer, and the peripheral side surface portion of the solar cell layer was not covered. .
The test results are shown in Table 1.

Comparative Example 2
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, a flexible / adhesive resin layer was not formed between the solar cell layer and the flexible surface protective film layer.
The test results are shown in Table 1.

Reference example 2
In the same manner as in Example 1, a flexible membranous solar cell multilayer was produced and subjected to a test. However, a crosslinkable adhesive resin layer was not formed.
The test results are shown in Table 1.

FIG. 1- (A) is an explanatory plan view of an example of the configuration of the flexible membranous solar cell multilayer body of the present invention. 1- (B) is a cross-sectional explanatory view taken along line BB of the flexible film-like solar cell multilayer body of FIG. 1- (A). The plane explanatory view of other examples of the flexible membrane solar cell multilayer object of the present invention. Fig.3- (a) is sectional explanatory drawing which shows a structure of an example of the film used for the electroconductive part moisture-proof layer formation of the flexible film | membrane solar cell multilayer body of this invention. FIG. 3B is a cross-sectional explanatory view showing the structure of another example of the conductive part moisture-proof layer forming film. FIG.3- (c) is sectional explanatory drawing which shows the structure of another example of the said film for conductive part moisture-proof layer formation. Fig.4- (a) is sectional explanatory drawing which shows a structure of an example of the film used for formation of the flexible surface protection film layer of the flexible film | membrane solar cell multilayer body of this invention. FIG. 4- (b) is a cross-sectional explanatory view showing the structure of another example of the flexible surface protective film layer forming film. FIG. 5 is a cross-sectional explanatory view of another example of the flexible membranous solar cell multilayer body of the present invention. FIG. 6 is a cross-sectional explanatory view of still another example of the flexible membranous solar cell multilayer body of the present invention. FIG. 7 is a cross-sectional explanatory view of still another example of the flexible membranous solar cell multilayer body of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell layer 1A Flexible solar cell module 1a Solar cell 1b Current collecting connector 2 Comb electrode 3 Anode current collecting electrode 4 Cathode current collecting electrode 5 Flexible / waterproof support film material 6 Crosslinkable adhesive resin layer 7a Anode Conductive part 7b Cathode conductive part 8 Conductive part moisture-proof layer 8a Polyester film 8b Metal deposition layer 8c Metal foil 8d Insulating resin film 8e Metal oxide deposition layer 8f, 8g Extension part of conductive part moisture-proof layer 9 Flexible / adhesive resin layer DESCRIPTION OF SYMBOLS 10 Flexible surface protective film layer 11 Transparent fluororesin film 12 Transparent adhesive layer 13 Transparent polyester film 14 Transparent metal oxide vapor deposition layer 15 Transparent metal oxide vapor deposition polyester film

Claims (13)

Flexible and waterproof support membrane material 5;
The solar cell layer 1 disposed on and joined to the inner side of the flexible and waterproof support membrane material, leaving the peripheral edge,
A flexible surface protective film layer 10 that covers the entire surface of the solar cell layer and that continuously extends to the outside of the solar cell layer and is bonded onto the peripheral edge of the flexible and waterproof support film material;
A flexible / adhesive resin layer 9 in which the entire surface of the solar cell layer covered by the flexible surface protective film layer and the peripheral portion of the flexible / waterproof support film material are bonded to the flexible surface protective film layer. Including
The solar cell layer 1 includes one or more flexible solar cell modules 1A,
Each of the solar cell modules 1A includes one or more solar cells 1a and one current collecting connector 1b.
A pair of anode current collecting electrode 3 and cathode current collecting electrode 4 is disposed on the current collecting connector 1b.
The solar battery cell 1a is connected to the anode current collecting electrode through an anode conductive part 7a, and is connected to the cathode current collecting electrode through a cathode conductive part 7b, and at least the anode conductive part 7a And the cathode conductive portion 7b is covered with the conductive portion moisture-proof layer 8 directly or indirectly via the flexible / adhesive resin layer 9, and a flexible membrane-like solar cell Multi-layered.   The said electroconductive part moisture-proof layer 8 is formed by 1 or more types chosen from the metal vapor deposition polyester film, the laminated | multilayer film of a metal layer and an insulating resin film, and a metal oxide vapor deposition polyester film. Flexible membrane solar cell multilayer.   The flexible surface protection film layer 10 has an area of 120 to 200% of the total surface area of the solar cell layer, and completely covers the flexible adhesive resin layer covering the solar cell layer. The flexible membrane-like solar cell multilayer body according to claim 1, which is coated and further extended outwardly and joined to the flexible and waterproof support membrane material.   The flexible surface protective film layer (10) includes at least one transparent fluorine-containing resin film, a transparent metal oxide-deposited polyester film, and an ultraviolet blocking adhesive layer that bonds them together. 4. The flexible membrane solar cell multilayer according to 1 or 3.   The flexible / adhesive resin layer 9 is formed by a film made of a crosslinkable resin of a crosslinkable ethylene-vinyl acetate copolymer, covers the entire surface area of at least the surface side of the solar cell layer, and The flexible membrane-like solar cell multilayer body according to claim 1, which extends outward and is joined to the flexible and waterproof support membrane material.   The flexible / adhesive resin layer 9 further extends between the solar cell layer 1 and the flexible / waterproof support film material 5, and the back surface side of the solar cell layer, The flexible film-like solar cell multilayer body according to claim 5, wherein a waterproof support film material is adhered.   The solar cell layer 1 includes a plurality of flexible solar cell modules 1 </ b> A, and these flexible solar cell modules are separated from each other on the inner portion of the flexible / waterproof support film material 5. The flexible surface protection film layer covers each flexible solar cell module, extends further to the outside, and is bonded to the flexible / waterproof support film material. The flexible film-like solar cell multilayer body according to claim 1.   The flexible membrane solar cell multilayer body according to claim 1, wherein each of the anode conductive portion 7a and the cathode conductive portion 7b is directly covered with the conductive portion moisture-proof layer 8.   The conductive portion moisture-proof layer 8 directly covering the anode conductive portion 7a and the cathode conductive portion 7b includes the flexible / adhesive resin layer 9, the solar cell layer 1, and the flexible / waterproof support film material 5. The flexible membranous solar cell multilayer body according to claim 8, further comprising conductive portion moisture-proof layer extension portions 8 f and 8 g extending between the first and second portions.   The conductive portion moisture-proof layer 8 is disposed between the flexible / adhesive resin layer 9 and the flexible surface protective film layer 10, whereby the anode conductive portion 7a and the cathode conductive portion 7b are The flexible film-like solar cell multilayer body according to claim 1, which is indirectly covered with the flexible / adhesive resin layer 9.   The flexible surface protective film layer 10 and each of the flexible / adhesive resin layer 9 and the peripheral portion 5a of the flexible / waterproof support film material are joined via the crosslinkable adhesive resin layer 6. The flexible film-like solar cell multilayer body according to any one of claims 1 and 3 to 10.   The flexible film-like solar cell composite according to claim 11, wherein the cross-linkable adhesive resin layer 6 includes a cured product of at least one cross-linking material selected from an epoxy resin, an isocyanate compound, and a coupling agent compound. Layered body.   The crosslinkable adhesive resin layer 6 includes any one of an acrylic resin containing a primary amino group or a fluoroolefin-vinyl copolymer resin containing a hydroxyl group and a carboxyl group. A flexible membrane solar cell multilayer.

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