HK1130565B - Flexible film-like solar cell composite layer - Google Patents

Description

Flexible film-like solar cell multilayer body

Technical Field

The invention relates to a flexible film-shaped solar cell multilayer body. More specifically, the present invention relates to a flexible film-like solar cell laminate which includes a flexible solar cell and is excellent in moisture resistance and water resistance. The flexible film-shaped solar cell composite of the present invention is useful as a component of a large tent structure, a tent warehouse, a sunshade tent, a room tent, an agricultural room, a truck hood, a louver, and the like, which needs to be rolled up or bent for transportation or storage.

Background

Since the energy of the solar cell is inexhaustible because of the sun, and the energy is not exhausted like fossil energy, the solar cell is expected as clean energy that contributes most to preventing global warming with zero load on the environment. In addition, the amorphous silicon solar cell has advantages of being thin and lightweight, being low in manufacturing cost, being easily manufactured in a large area, and the like, and thus is considered to be the mainstream of the solar cell in the future.

Although a glass substrate is used for a conventional solar cell, a flexible solar cell using a plastic film, a metal film, or the like as a substrate can be mass-produced by a roll-to-roll (roll) type manufacturing method using flexibility thereof in terms of weight reduction, workability, and mass productivity.

In the conventional solar cell used in a building, a roof-mounted solar cell in which a single crystal silicon or polycrystalline silicon solar cell is mounted on a roof is used, a method of mounting a support frame on the roof and fixing and supporting the solar cell on the support frame is used, and a method of directly mounting the solar cell on the roof has been used in recent years. However, in these methods, since a module made of a glass substrate is used, it is difficult in workability and workability.

On the other hand, the above problems have been solved by integrating a film-like flexible solar cell on the upper surface of a polymer sheet such as a vulcanized rubber-based, vinyl chloride-based, and asphalt-based non-vulcanized rubber called a roof waterproof sheet. However, if desired flexibility is to be obtained, there is a disadvantage that the material for protecting the power generating element of the solar cell is limited to an organic material. As a result, the moisture resistance, weather resistance, adhesion, and the like are reduced, and the life of the solar cell is shortened. As a surface protective material for improving the above-described drawbacks, a sheet having a silicon oxide film formed on the surface of a fluororesin film has been proposed (for example, patent document 1). Further, a method of using a transparent polychlorotrifluoroethylene resin film as a surface protective film has been proposed (for example, patent document 2).

Although various methods for improving moisture resistance by using an organic material have been studied, at present, a film material integrated with a solar cell having desired flexibility is still insufficient in durability.

The reason why the power generation output of the solar cell is reduced is various, but mainly the following reason.

(1) Moisture absorption of the electrode portion:

since the electrode portion absorbs moisture, the resistance value increases, and the maximum output operating voltage also decreases accordingly. Resulting in a reduction in the power generation output.

Since a solar cell module is configured by arranging at least 1 unit or more of solar cells, it is necessary to connect linear collecting electrodes of an anode portion and a cathode portion of each solar cell. Therefore, a lead wire having a conductive binder can be attached to the collector to form an output lead wire.

Therefore, it is necessary to improve the increase in the resistance value of the electrode portion due to moisture absorption of the pressure-sensitive adhesive layer of the conductive pressure-sensitive adhesive, and as a result, the reduction in the power generation output.

(2) Moisture absorption by the flexible surface protective film layer:

in order to prevent moisture absorption of the solar cell, the surface protection film is generally covered with an adhesive resin, but after a durability test such as a moisture resistance test or a weather resistance test is performed, adhesion at an interface between layers is lowered, and the power generation output is reduced by moisture absorption from the portion.

Therefore, it is particularly required to improve the adhesion durability between the surface protecting film layer and the water-repellent film material.

Patent document 1: japanese laid-open patent publication No. 10-308521

Patent document 2: japanese patent laid-open No. 2006 and 100527

Disclosure of Invention

The present invention solves the above-mentioned problems of the conventional flexible solar cell structure, and provides a flexible film-like solar cell multilayer body which has sufficient flexibility in practical use, has high durability, has no or little moisture absorption in an electrode portion, and has high durability against adhesion of a moisture absorption structure.

The flexible film-like solar cell multilayer body of the present invention is characterized by comprising: a flexible waterproof support film material 5; a solar cell layer 1 which is disposed on and bonded to an inner side portion of the flexible waterproof support film material with an edge portion of the flexible waterproof support film material left; a flexible surface protection film layer 10 which covers the entire surface of the solar cell layer, continuously extends outward of the solar cell layer, and is joined to an edge portion of the flexible waterproof support film material; and a flexible adhesive resin layer 9 which bonds the entire surface of the solar cell layer covered with the flexible surface protective film layer and the edge portion of the flexible water-repellent support film material to the flexible surface protective film layer. The solar cell layer 1 includes 1 or more flexible solar cell modules 1A; each of the above solar battery modules 1A includes 1 or more solar battery cells 1A and 1 collecting connector 1 b; an anode collector electrode 3 and a cathode collector electrode 4 constituting 1 pair are arranged on the current collector connector 1 b; the solar cell 1a is connected to the anode collector via an anode conductive part 7a, and is connected to the cathode collector via a cathode conductive part 7 b; at least the anode conductive part 7a and the cathode conductive part 7b are covered with a conductive part moisture-proof layer 8 directly or indirectly via the flexible adhesive resin layer 9.

In the flexible film-like solar cell laminate according to the present invention, the conductive moisture-proof layer 8 is preferably formed of at least one film 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.

In the flexible film-shaped solar cell laminate according to the present invention, it is preferable that 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 flexible adhesive resin layer covering the solar cell layer is completely covered and further extended to the outside of the flexible adhesive resin layer, and is joined to the flexible water-repellent support film.

In the flexible film-like solar cell multilayer body according to the present invention, the flexible surface protective film layer 10 preferably includes at least 1 layer of a transparent fluorine-containing resin film, a transparent metal oxide-deposited polyester film, and an ultraviolet-shielding adhesive layer bonding these films to each other.

In the flexible film-shaped solar cell laminate of the present invention, the flexible adhesive resin layer 9 is preferably formed of a film of a crosslinked resin containing a crosslinkable ethylene-vinyl acetate copolymer, covers at least the total surface area of the surface side of the solar cell layer, extends further to the outside of the solar cell layer, and is joined to the flexible water-repellent support film material.

In the flexible film-shaped solar cell laminate according to the present invention, it is preferable that the flexible adhesive resin layer 9 further extends between the solar cell layer 1 and the flexible water-repellent support film 5, and bonds the back surface side of the solar cell layer to the flexible water-repellent support film.

In the flexible film-like solar cell laminate according to the present invention, it is preferable that the solar cell layer 1 includes a plurality of flexible solar cell modules 1A which are separately arranged and joined to an inner side portion of the flexible waterproof support film 5; the flexible surface protective film layer covers each flexible solar cell module, further extends to the outside of the flexible solar cell module, and is joined to the flexible waterproof support film material.

In the flexible film-like solar cell multilayer body according to the present invention, it is preferable that the anode conductive part 7a and the cathode conductive part 7b are directly covered with the conductive part moisture-proof layer 8, respectively.

In the flexible film-shaped solar cell laminate of the present invention, it is preferable that the conductive portion moisture-proof layer 8 directly covering the anode conductive portion 7a and the cathode conductive portion 7b has conductive portion moisture-proof layer extension portions 8f and 8g which extend further between the flexible adhesive resin layer 9 and the solar cell layer 1 and between the flexible adhesive resin layer 9 and the flexible waterproof support film 5, respectively.

In the flexible film-like solar cell multilayer body according to the present invention, it is preferable that the conductive portion moisture-proof layer 8 is disposed between the flexible adhesive resin layer 9 and the flexible surface protective film layer 10, and thereby the anode conductive portion 7a and the cathode conductive portion 7b are indirectly covered with the conductive portion moisture-proof layer 8 via the flexible adhesive resin layer 9.

In the flexible film-shaped solar cell laminate of the present invention, it is preferable that the flexible surface protecting film layer 10 and the flexible adhesive resin layer 9, and the flexible surface protecting film layer 10 and the edge portion 5a of the flexible water-repellent support film material are bonded to each other through a crosslinkable adhesive resin layer 6.

In the flexible film-like solar cell multilayer body according to the present invention, the crosslinkable adhesive resin layer 6 preferably contains a cured product of at least one crosslinking agent selected from the group consisting of an epoxy resin, an isocyanate compound, and a coupling agent compound.

In the flexible film-like solar cell laminate of the present invention, the crosslinkable adhesive resin layer 6 preferably contains any one of an acrylic resin having a primary amino group and a fluoroolefin-vinyl copolymer resin having a hydroxyl group and a carboxyl group.

The flexible film-like solar cell laminate of the present invention has sufficient flexibility in practical use, and can prevent moisture absorption at the output lead wire portion and moisture absorption at other power generation elements of the solar cell unit even when used under a high-temperature and high-humidity environment or used outdoors for a long period of time, thereby achieving an effect of preventing a reduction in power generation output.

Drawings

FIG. 1: fig. 1- (a) is a plan view illustrating an example of the structure of the flexible film-like solar cell laminate of the present invention.

Fig. 1- (B) is a cross-sectional explanatory view of the flexible film-like solar cell multilayer body of fig. 1- (a) taken along line B-B.

Fig. 2 is a plan view illustrating another example of the flexible film-like solar cell laminate according to the present invention.

FIG. 3: fig. 3- (a) is a cross-sectional explanatory view showing a configuration of an example of a film for forming the conductive moisture-proof layer of the flexible film-like solar cell laminate according to the present invention.

FIG. 3- (b) is a cross-sectional explanatory view showing another example of the thin film for forming the conductive section moisture-proof layer.

FIG. 3- (c) is a cross-sectional explanatory view showing another example of the thin film for forming the conductive section moisture-proof layer.

FIG. 4: fig. 4- (a) is a cross-sectional explanatory view showing a structure of an example of a film for forming the flexible surface protective film layer of the flexible film-like solar cell laminate of the present invention.

FIG. 4- (b) is a cross-sectional explanatory view showing another example of the film for forming the flexible surface-protecting thin film layer.

Fig. 5 is a cross-sectional explanatory view of another example of the flexible film-like solar cell laminate of the present invention.

Fig. 6 is a cross-sectional explanatory view of another example of the flexible film-like solar cell laminate of the present invention.

Fig. 7 is a cross-sectional explanatory view of still another example of the flexible film-like solar cell laminate of the present invention.

Description of the symbols

1 solar cell layer

1A flexible solar cell module

1a solar cell unit

1b current collecting connector

2 comb-shaped electrode

3 anode collector

4 cathode collector

5 Flexible waterproof supporting membrane material

6 Cross-linkable adhesive resin layer

7a Anode conductive part

7b cathode conductive part

8 conductive part moisture barrier

8a polyester film

8b metal vapor deposition layer

8c Metal foil

8d insulating resin film

8e metal oxide vapor deposition layer

Extensions of 8f, 8g conductive section moisture barrier

9 Flexible adhesive resin layer

10 Flexible surface protective film layer

11 transparent fluorine-based resin film

12 transparent adhesive layer

13 transparent polyester film

14 transparent metal oxide vapor deposition layer

15 transparent metal oxide vapor-deposited polyester film

Detailed Description

As shown in fig. 1(a) and (B), the flexible film-like solar cell multilayer body of the present invention includes: a flexible waterproof support film material 5; a solar cell layer 1 which is disposed leaving an edge portion of the flexible waterproof support film and is joined to an inner side portion thereof; a flexible surface protection film layer 10 which covers the entire surface of the solar cell layer, continuously extends outward of the solar cell layer, and is joined to an edge portion of the flexible waterproof support film material; and a flexible adhesive resin layer 9 which bonds the entire surface of the solar cell layer covered with the flexible surface protective film layer and the edge portion of the flexible water-repellent support film material to the flexible surface protective film layer. Preferably, as shown in fig. 1- (B), the flexible surface protecting film layer 10 is bonded to the flexible adhesive resin layer 9 and the edge portion of the flexible water-repellent supporting film material through the crosslinkable adhesive resin layer 6.

The flexible surface protecting film layer, the crosslinkable adhesive resin layer 6 and the flexible adhesive resin layer 9 are all transparent to sunlight.

In fig. 1- (a), (B) and 2, the solar cell layer 1 includes 1 or a plurality of (1 in fig. 1- (a) and a plurality in fig. 2) flexible solar cell modules 1A each including 1 (fig. 1- (a)) or a plurality of (fig. 2) solar cells 1A and 1 collector connector 1B, the solar cells 1A have a plurality of comb-shaped electrodes 2, the collector connector 1B is provided with an anode collector 3 and a cathode collector 4 constituting 1 pair, and the solar cells 1A are connected to the anode collector 3 via an anode conductive part 7a and connected to the cathode collector 4 via a cathode 7B. The positive and negative electrode collectors of the current collecting connector 1b are connected to a positive electrode terminal and a negative electrode terminal (not shown) disposed on the front surface side or the back surface side of the flexible waterproof supporting film 5, respectively.

In fig. 1- (a) and (B), the solar cell layer 1 is disposed on the inner side of the surface of the flexible water-repellent support film material 5 with an edge portion left, and is bonded to the flexible water-repellent support film material 5, and the flexible surface protection film layer 10 covers the entire surface of the solar cell layer 1, extends further to the outside of the solar cell layer 1, and is bonded to the edge portion of the flexible water-repellent support film material 5. At this time, the flexible surface protecting film layer 10 is bonded to the solar cell layer 1 and the edge portion of the flexible waterproof supporting film material 5 via the flexible adhesive resin layer 9. Further, the crosslinkable resin layers 6 are preferably formed between the flexible surface-protecting film layer 10 and the flexible adhesive resin layer 9, and between the flexible surface-protecting film layer 10 and the edge portion of the flexible water-repellent support film material 5.

In fig. 1- (a) and (B), the flexible solar cell 1a is preferably a thin film amorphous silicon solar cell, and the conductive material constituting the anode and cathode conductive portions 7a and 7B is not particularly limited, but a tin-plated copper wire is generally used. The thickness of each conductive part is preferably 0.02 to 1mm, and particularly, in order to have good flexibility and bendability, the thickness is more preferably 0.05 to 0.5 mm. In addition, in order to electrically connect the back surfaces of the positive and negative electrode conductive portions 7a and 7b to the solar battery cell 1a and the collector connector 1b and to electrically connect the positive and negative electrode collector electrodes 3 and 4, a conductive adhesive is preferably used in a continuous layer.

The positive and negative electrode conductive parts 7a and 7b are completely covered with the conductive part moisture-proof layer 8 having excellent moisture-proof property directly or indirectly via the flexible adhesive resin layer 9, whereby a decrease in current collection efficiency due to moisture absorption can be prevented or reduced. Preferably, the anode and cathode collectors are also covered with a moisture-proof layer.

In the flexible film-shaped solar cell laminate according to the present invention, the solar cell layer may include 2 or more flexible solar cell modules, and in this case, the 2 or more flexible solar cell modules disposed and bonded to the inner side portions of 1 flexible water-repellent support film may be covered with a common flexible surface protective film layer, and a continuous flexible adhesive resin layer and a crosslinkable resin adhesive layer disposed as needed may be disposed therebetween.

As shown in fig. 2, 2 or more flexible solar cell modules 1A are disposed and bonded to the inner side of 1 flexible water-repellent support film 5 while being separated from each other, and each of the 2 or more flexible solar cell modules 1A is covered with 1 flexible surface protection film layer 10, and the flexible surface protection film layer may be further extended to the outer side of the flexible solar cell module and bonded to the flexible water-repellent support film 5. In this case, a flexible adhesive resin layer and a crosslinkable resin adhesive layer disposed as necessary may be formed between the flexible solar cell module 1A and the flexible surface protective film layer covering the same. In this way, in the obtained flexible film-like solar cell laminate, good flexibility can be obtained in the intermediate portions of the plurality of flexible solar cell modules 1A arranged apart from each other.

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

In addition, the moisture-proof films shown in (a), (b) and (c) of fig. 3 are used alone or in combination, and 1) the example shown in fig. 5 is configured such that the conductive moisture-proof layer 8 is formed on the anode conductive part 7a and the cathode conductive part 7b by covering only the peripheral surfaces of the anode and cathode conductive parts 7a and 7 b; 2) in the example shown in fig. 6, the continuous conductive/moisture-proof layer 8 covers the circumferential surfaces of the anode and cathode conductive parts 7a and 7b, covers the entire surface of the solar cell layer 1, and has extension parts 8f and 8g extending further toward and covering the surface of the flexible water-proof support film material 5; further, 3) the example shown in fig. 7 is configured such that the continuous flexible adhesive resin layer 9 covers the circumferential surfaces of the anode and cathode conductive portions 7a and 7b, covers the entire surface of the solar cell layer 1, further extends to and covers the surface of the flexible waterproof support film material 5, and the continuous conductive portion moisture-proof layer 8 covers the entire surface of the continuous flexible adhesive resin layer 9, thereby indirectly covering the anode and cathode conductive portions 7a and 7 b. The moisture-proof film for the conductive moisture-proof layer 8 shown in fig. 3- (a) is composed of a polyester film 8a and a metal deposition layer 8 b.

The metal deposited on the polyester film is preferably a metal selected from aluminum, tin, titanium, indium, silicon, magnesium, iron, zinc, zirconium, cobalt, chromium, nickel, and the like. As a method for forming the metal deposition layer, any method such as a vacuum deposition method, a sputtering method, an ion plating method, various CVD methods, or the like can be used, but a vacuum deposition method, a sputtering method, a CVD method, or the like can be particularly preferably used. The thickness of the metal deposition layer is preferably 5 to 500nm, and more preferably 10 to 200 nm.

The moisture-proof film for the conductive moisture-proof layer 8 shown in fig. 3- (b) is a film in which a metal foil 8c is attached to an insulating resin film 8 d. As such a metal foil, gold, silver, platinum, palladium, aluminum, copper, stainless steel, or the like can be preferably used. As the insulating resin film, a general thermoplastic resin film or thermosetting resin film can be used. As the thermoplastic resin film, films of polyvinyl chloride resin, polyethylene resin, polystyrene resin, ABS resin, acrylic resin, polypropylene resin, polycarbonate resin, polyamide resin, polyacetal resin, polybutylene terephthalate resin, and the like can be preferably used. On the other hand, as the thermosetting resin, a thin film of a phenol resin, a urea resin, a melamine resin, an epoxy resin, a urethane resin, or the like can be preferably used. In order to enhance the adhesion between the metal foil and the insulating resin film, a urethane resin, a polyester resin, an epoxy resin, an acrylic resin, or the like can be used as the adhesive. Further, by subjecting the insulating resin film to a pretreatment such as corona treatment, ozone treatment, or plasma treatment, the adhesiveness to the metal foil can be improved.

The thickness of the metal foil is preferably 1to 100 μm, and more preferably 10 to 50 μm.

The moisture-proof film for the conductive portion moisture-proof layer 8 shown in fig. 3- (c) is a film in which a metal oxide vapor-deposited layer 8e is vapor-deposited on a polyester film 8 a. In this case, as the metal oxide to be deposited on the polyester film, oxides of metals such as silicon, aluminum, magnesium, calcium, potassium, sodium, boron, titanium, zirconium, and yttrium can be used. Particularly preferred are silica, alumina, and magnesia.

As a method for forming the vapor deposition layer, any of vacuum vapor deposition, sputtering, ion plating, various CVD methods, and the like can be used, and vacuum vapor deposition, sputtering, and CVD methods are particularly preferably used. The thickness of the metal oxide deposition layer is preferably 5 to 500nm, and more preferably 10 to 200 nm.

The moisture-proof film is preferably used for moisture-proof covering of the anode and cathode collectors, moisture-proof covering of the solar cell, or covering of the anode and cathode collectors and the solar cell together, and more preferably has light transmittance.

As the flexible adhesive resin forming the flexible adhesive resin layer 9, a crosslinkable ethylene-vinyl acetate copolymer composition is preferably used. In the ethylene-vinyl acetate copolymer resin, a copolymer resin having a vinyl acetate structural unit content of 1to 40 mol%, preferably 10 to 35 mol%, can be used in a good balance among weather resistance, transparency, and mechanical properties of the resin. In addition, in order to improve the weatherability of the ethylene-vinyl acetate copolymer resin composition, a crosslinking agent is mixed to have a crosslinked structure, and as the crosslinking agent, an organic peroxide which generates a radical at 100 ℃ or higher can be preferably used in general. Examples of such organic peroxides include benzoyl peroxide, dicumyl peroxide, 2, 5-dimethyl-di (t-butylperoxy) hexane, 1-di-t-butylperoxy-3, 3, 5-trimethylcyclohexane, and 1, 3-di (t-butylperoxy) diisopropylbenzene. In general, the amount of the organic peroxide to be mixed is preferably 5 parts by weight or less, more preferably 1to 3 parts by weight, based on 100 parts by weight of the ethylene-vinyl acetate copolymer resin. The flexible adhesive resin can be melted at a temperature of 120 to 170 ℃ and a pressure of 1Torr or less, and can be crosslinked and cured while filling a gap between the solar cell layer and the flexible surface protection film layer.

Preferably, the flexible adhesive resin layer covers at least the entire surface area of the solar cell layer on the front surface side, extends outward, and is joined to the flexible water-repellent support film material. The surface area of the flexible adhesive resin layer is preferably 105 to 150% of the total surface area of the solar cell layer in a state where the flexible adhesive resin layer covers only the front surface side of the solar cell layer. The surface side area of the flexible adhesive resin layer and the surface area of the solar cell layer are areas in a plan view thereof.

If the area of the flexible adhesive resin layer is less than 105% of the total surface area of the front surface side of the solar cell layer, the flexible adhesive resin layer does not completely cover the solar cell layer, and at this time, moisture is absorbed at the portion where the solar cell layer is not completely covered, and further, an influence due to moisture absorption, for example, an increase in internal resistance, is generated in the power generation element of the solar cell where moisture absorption has occurred, thereby reducing the power generation output. Preferably, the flexible adhesive resin layer covers the entire surface of each of the front surface side and the back surface side of the solar cell layer, has an area of 105 to 150% of the total surface area of the solar cell layer, extends outward, and is joined to the flexible water-repellent support film material. In this case, if the area of the flexible adhesive resin layer on the front side or the back side is less than 105% of the surface area of the solar cell layer, the solar cell layer is not completely covered, and moisture is absorbed at the incompletely covered portion of the solar cell layer, and an influence due to moisture absorption, for example, an increase in internal resistance, is generated in the power generation element of the solar cell in which moisture absorption has occurred, thereby reducing the power generation output. Further, if the solar cell contacts moisture for a long period of time, deterioration of the power generating element occurs. When the area ratio is more than 150%, the area of the flexible adhesive resin layer is larger than that of the flexible surface-protecting film layer, and the flexible adhesive resin layer exposed to the outside of the flexible surface-protecting film layer is contaminated with dust or the like, thereby deteriorating the appearance of the product.

The solar cell layer includes a plurality of flexible solar cell modules, the modules are arranged separately from each other, and when the modules are independently covered with each other, the surface area of the flexible waterproof resin layer is preferably adjusted to 105 to 150% of the total surface area of each module.

The flexible surface protecting film layer is preferably formed of a transparent fluorine-based resin film. As such a transparent fluorine-based resin for forming a film, a monomer polymer resin of one kind selected from vinyl fluoride, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene, fluoroalkyl vinyl ether and ethylene, or a monomer copolymer resin of two or more kinds can be used. Particularly, chlorotrifluoroethylene having excellent moisture resistance is preferably used.

The thickness of the flexible surface protection film layer is preferably 0.03 to 0.5mm, and particularly preferably 0.05 to 0.3 mm. If the thickness is less than 0.03mm, moisture resistance may be insufficient, and if it exceeds 0.5mm, 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 is lowered.

The flexible surface protection film layer 10 preferably has an area of 120 to 200% of the total surface area of the solar cell layer, completely covers the flexible adhesive resin layer covering the solar cell layer, further extends outward, and is joined to the flexible water-repellent support film material. The areas of the flexible surface protection film layer and the solar cell layer are areas in a plan view. If the area of the flexible surface protection film layer is less than 120% of the total surface area of the solar cell layer, the flexible surface protection film layer may not completely cover the solar cell layer and the flexible adhesive resin layer, and the flexible waterproof support film material may not be sufficiently bonded to the flexible waterproof support film material, whereby the solar cell layer module absorbs moisture, increasing the internal resistance of the power generation element, and reducing the power generation output. On the other hand, if it exceeds 200%, the flexible surface protective film layer covers the flexible water-repellent support film material excessively, and as a result, the obtained flexible film-like solar cell multilayer body becomes difficult to sew. Therefore, it is preferable to leave a portion of the edge portion of the flexible waterproof supporting film material to be sewn, which is not covered with the flexible surface protecting film layer.

As the film forming the flexible surface protecting film layer 10, as shown in fig. 4- (a), a transparent fluorine-based resin film 11 is preferably used, and more preferably, as shown in fig. 4- (b), a transparent metal oxide vapor-deposited polyester film 15 having a transparent metal oxide vapor-deposited layer 14 formed on one surface of a polyester film 13 is used, and the transparent metal oxide vapor-deposited layer 14 is bonded to and integrated with one surface of the transparent fluorine-based resin film 11 through a transparent adhesive layer 12 having an ultraviolet shielding effect so as to face the transparent fluorine-based resin film 11. The flexible surface-protecting thin film layer formed of a laminated structure thin film containing such a metal oxide deposition layer also preferably has a light transmittance of 80% or more. If the light transmittance is less than 80%, the power generation output of the obtained flexible film-shaped solar cell laminate is insufficient.

As the adhesive for the ultraviolet shielding transparent adhesive layer 12 of the flexible surface protecting film layer 10 shown in fig. 4- (b), a urethane resin, a polyester resin, an epoxy resin, an acrylic resin, or the like can be used. Further, the adhesive surface of the transparent fluororesin film 11 may be subjected to corona discharge treatment, ozone treatment or plasma discharge treatment to improve the adhesiveness. In order to prevent deterioration of the transparent metallized deposited polyester film 13 by ultraviolet rays, an ultraviolet absorber is contained in the adhesive for the transparent adhesive layer 12. As the ultraviolet absorber, an ultraviolet absorbing inorganic compound such as titanium oxide, zinc oxide, and cesium oxide can be used. In order to maintain high transparency of the flexible surface-protecting thin film layer, the particle diameter of these inorganic compounds is preferably 0.1 μm or less. Further, as the organic compound for an ultraviolet absorber, benzophenone-based, benzotriazole-based, oxalic anilide-based, cyanoacrylate-based, and triazole-based ultraviolet absorbers can be used. By using the inorganic ultraviolet absorber and the organic ultraviolet absorber in combination, the ultraviolet shielding effect can be further enhanced.

In the flexible film-shaped solar cell laminate of the present invention, as shown in fig. 1- (B), the flexible surface protecting film layer 10 and the flexible adhesive resin layer 9, and the flexible surface protecting film layer 10 and the edge portion of the flexible water-repellent support film material are preferably bonded to each other via a crosslinkable adhesive resin layer 6. The crosslinkable adhesive resin contains an adhesive resin component and a crosslinking agent component, and an epoxy compound, an isocyanate compound, a coupling agent compound, and the like can be used as the crosslinking agent.

As the epoxy compound for the crosslinking agent, bisphenol A, an epoxy resin of the epichlorohydrin type, ethylene glycol glycidyl ether, polyethylene glycol glycidyl ether, glycerol triglycidyl ether, 1, 6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, diglycidylaniline, diglycidylamine, N, N, N ', N ' -tetraglycidyl-m-xylylenediamine, and 1, 3-bis (N, N ' -diglycidylaminomethyl) cyclohexane can be used. In addition, an epoxy resin obtained by modifying the above epoxy resin with a chelating agent, a urethane resin, a synthetic rubber, or the like may be used.

Further, as the isocyanate compound for the crosslinking agent, it is preferable to use: aliphatic diisocyanates such as hexamethylene diisocyanate and lysine diisocyanate, and the like; alicyclic diisocyanates such as isophorone diisocyanate and hydrogenated toluene diisocyanate, and the like; aromatic diisocyanates such as toluene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate and the like; isocyanurates such as tris (hexamethylene isocyanate) isocyanurate and tris (3-isocyanatomethylbenzyl) isocyanurate, and the like; and blocked isocyanates obtained by blocking the terminal isocyanate group of the above compounds with a blocking agent such as phenols, oximes, alcohols, and lactams.

As the coupling agent compound used as the crosslinking agent of the crosslinkable adhesive resin, at least one selected from the group consisting of a silane coupling agent, a titanium coupling agent, a zirconium coupling agent, an aluminum coupling agent, and a zirconium-aluminum coupling agent can be used. Examples of the silane coupling agent include: aminosilanes such as γ -aminopropyltriethoxysilane and N-phenyl- γ -aminopropyltriethoxysilane; epoxysilanes, such as gamma-glycidoxypropylmethyldiethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and beta- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane; vinylsilanes such as vinyltriethoxysilane and vinyltris (. beta. -methoxyethoxy) silane; mercaptosilanes such as gamma-mercaptopropyltrimethoxysilane, and the like.

Examples of the titanium-based coupling agent include: alkoxides such as titanium tetraisopropoxide, titanium tetra-n-butoxide, and titanium tetra (2-ethylhexyloxide); acylates such as tri-n-butoxytitanium stearate (tri-n-butoxytitanium stearate) and isopropoxytitanium tristearate (isopopoxytitanium stearate). Examples of the zirconium-based coupling agent include: such as tetrabutyl zirconate, tetra (triethanolamine) zirconate, and tetraisopropyl zirconate, and the like. Examples of the aluminum-based coupling agent include: for example, acetyl alkoxy aluminum diisopropoxide (acetoalkoxxy aluminum diisopropoxylate). Further, as the zirconium-aluminum-based coupling agent, tetrapropyl zirconate aluminate (tetrapropropyl zirconate) may be mentioned. Among the above coupling agents, epoxy silanes such as γ -glycidoxypropylmethyldiethoxysilane, γ -glycidoxypropyltrimethoxysilane, and β - (3, 4-epoxycyclohexyl) ethyltrimethoxysilane are particularly preferably used from the viewpoint of moisture resistance and light resistance.

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 based on 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 are insufficient. On the other hand, if the content exceeds 30 mass%, the resulting crosslinkable adhesive resin layer becomes hard, and the flexibility of the resulting flexible film-like solar cell laminate becomes insufficient.

The adhesive resin component in the crosslinkable adhesive resin layer is preferably composed of any one selected from an acrylic resin containing a primary amino group, and a fluoroolefin-vinyl copolymer resin containing a hydroxyl group and a carboxyl group. Among acrylic resins having a primary amine group, acrylic resins having a primary amine group introduced by ring-opening addition of aziridine to a carboxyl group of the acrylic resin are particularly preferable from the viewpoints of reactivity and adhesiveness. Among fluoroolefin-vinyl copolymer resins having a hydroxyl group and a carboxyl group, a chlorotrifluoroethylene-vinyl copolymer resin is particularly preferable from the viewpoint of reactivity and durability.

Further, the surface protective film layer is pretreated by corona treatment, ozone treatment, plasma treatment, or the like, whereby the adhesiveness to the crosslinkable adhesive resin can be improved.

The flexible waterproof support film 5 of the flexible film-shaped solar cell laminate of the present invention is composed of a flexible waterproof sheet, preferably having a thickness of 0.1 to 3.0mm and a thickness of 150 to 2500g/m²Mass per unit area of (d). The flexible waterproof sheet may contain a fiber fabric (woven fabric, knitted fabric, or nonwoven fabric) as a base fabric as necessary. In this case, the flexible waterproof resin layer is preferably formed by coating or impregnating a flexible waterproof synthetic resin on at least one side, more preferably on both sides, of a base fabric made of a fiber fabric. As the fibers forming the fiber fabric for base fabric, at least one selected from the following fibers can be used: natural fibers such as cotton, hemp, and the like; inorganic fibers such as glass fibers, carbon fibers, metal fibers, and the like; regenerated fibers such as viscose, cuprammonium, etc.; semi-synthetic fibers such as diacetic and triacetic acid fibers and the like; and synthetic fibers such as polyamide fibers such as nylon 6 and nylon 66, aromatic polyamide fibers such as Kevlar (Kevlar), polyester fibers (saturated polyester) such as polyethylene terephthalate and polyethylene naphthalate, and fatty acid polyester fibers such as polylactic acid fibers, polyarylate fibers, aromatic polyether fibers, polyimide fibers, acrylic fibers, vinylon fibers, polyethylene fibers, polyolefin fibers such as polypropylene fibers, and polyvinyl chloride fibers. The fiber material forming the fiber fabric may have any shape such as a spun yarn of short fibers, a filament shape, a split yarn, and a flat yarn. The fibrous base fabric may be formed of any of woven fabric, knitted fabric, nonwoven fabric, and a composite thereof.

The flexible water-repellent resin for the flexible water-repellent support film material may be selected from the following resins: polyvinyl chloride resins, polyolefin resins, chlorinated polyolefin resins, ethylene-vinyl acetate copolymer resins, ethylene- (meth) acrylate copolymer resins, ionomer resins (salts of ethylene- (meth) acrylic acid copolymers, etc.), polyurethane resins, polyester resins (including aliphatic polyester resins), acrylic resins, fluorine-containing resins, styrene copolymer resins (styrene-butadiene-styrene copolymers, styrene-isoprene-styrene copolymers, and hydrogenated products thereof, etc.), polyamide resins, polyvinyl alcohol resins, ethylene-vinyl alcohol copolymer resins, silicone resins, and other synthetic resins (including thermoplastic elastomers), and the like. The water-repellent synthetic resin may be used alone or as a mixture of two or more.

The surface of the flexible waterproof supporting film material may be covered with an antifouling layer. The antifouling layer is formed of a resin coating film having antifouling properties. As the stain-proofing resin, for example, at least one selected from the following synthetic resins can be used: fluorine-based resins, acrylic resins, polyurethane-based resins, olefin-based resins, ionomer-based resins, ethylene-vinyl acetate-based copolymer resins, ethylene-vinyl alcohol-based copolymer resins, polyvinyl alcohol-based resins, polyvinyl butyral-based resins, cellulose-based resins, polyester-based resins, polycarbonate-based resins, polyamide-based resins, silicone-based resins, acrylic-silicone-based resins, and the like. In the present invention, at least one selected from the group consisting of fluorine-based resins and acrylic resins is preferably used.

In another embodiment of the flexible adhesive resin layer in the flexible film-shaped solar cell laminate according to the present invention, as shown in fig. 5, the flexible adhesive resin layer 9 extends between the solar cell layer 1 and the flexible water-repellent support film 5 to bond the solar cell layer and the flexible water-repellent support film. In this way, the back surface side of the solar cell layer is bonded to the flexible water-repellent support film by a part of the flexible adhesive resin layer, so that the solar cell layer can be firmly bonded and held to the flexible water-repellent support film, and the solar cell layer can be protected.

In another embodiment of the conductive moisture-proof layer 8 of the flexible film-like solar cell laminate according to the present invention, as shown in fig. 6, the conductive moisture-proof layer 8 directly covering the anode conductive part 7a and the cathode conductive part 7b further extends between the flexible adhesive resin layer 9 and the flexible solar cell module 1A and between the flexible adhesive resin layer 9 and the flexible water-proof support film 5, and has conductive moisture-proof layer extension parts 8f and 8 g. Thus, the solar cell module 1A and the anode and cathode conductive parts 7a and 7b can be completely covered by forming the 2 conductive part moisture-proof layers 8 directly covering the anode and cathode conductive parts 7a and 7b, the intermediate conductive part moisture-proof layer extension part 8f formed in the middle of the inner sides of the 2 conductive parts, and the left and right conductive part moisture-proof layer extension parts 8g extending outside the 2 conductive part moisture-proof layers 8 to the joint part of the flexible surface protective film layer and the flexible water-repellent support film material 5 integrally, and the solar cell module 1A can be improved in the moisture-proof effect. In fig. 6, the distal end portions of the left and right conductive section moisture-proof layer extensions extend to the joint portions of the flexible water-proof support member 5, the flexible surface protective film layer 10, and the crosslinkable adhesive resin layer 6, but the flexible water-proof support member 5 and the flexible surface protective film layer 10 may be joined via the crosslinkable adhesive resin layer 6 extending thereto, or the flexible water-proof support member 5 may be directly joined to the distal end portions of both the flexible surface protective film layer 10 and the crosslinkable adhesive resin layer 6.

In another embodiment of the conductive moisture-proof layer 8 of the flexible film-like solar cell composite of the present invention, as shown in fig. 7, the solar cell layer 1 and the anode and cathode conductive portions 7a and 7b on the flexible water-proof support film 5 are covered with the flexible adhesive resin layer 9, the conductive moisture-proof layer 8 is formed on the flexible adhesive resin layer 9, and the anode and cathode conductive portions 7a and 7b are indirectly moisture-proof covered with the conductive moisture-proof layer 8 via the flexible adhesive resin layer 9. This makes it possible to easily form the conductive/moisture-proof layer 8 covering the anode and cathode conductive parts 7a and 7b and the solar cell module 1 using a moisture-proof film.

In fig. 7, the left and right end portions of the conductive moisture-proof layer 8 extend to the joint portions of the flexible water-proof support film material, the flexible surface-protecting film layer 10, and the crosslinkable adhesive resin layer 6, but the flexible water-proof support film material may be joined to the ends of the flexible surface-protecting film layer 10 via the end portions of the crosslinkable adhesive resin layer 6 extending therebetween, or may be joined to the ends of the flexible surface-protecting film layer 10 and the crosslinkable adhesive resin layer 6, respectively.

Examples

The flexible film-like solar cell laminate of the present invention is further illustrated by the following examples.

The battery multilayer bodies manufactured in the following examples and comparative examples were used in the following tests.

(1) Measurement of Power Generation output

The power generation output of the samples before and after the environmental test was measured according to JIS-C8935-1995.

(2) Moisture resistance

The samples were placed at 85 ℃ and 85% RH, and the power generation output retention (%) after 1000 hours of standing was measured, and the appearance (color, film peeling, swelling, and others) was evaluated in the following four grades.

(appearance evaluation)

4: there was no change from the state before the start of measurement.

3: slight coloration was found.

2: yellowing was observed, and swelling and peeling of the film (flexible surface protective film layer) were observed to occur locally in the sample.

1: yellowing was observed, and the film was found to bulge and peel off over the entire sample.

(3) Weather resistance

The samples were subjected to ultraviolet irradiation under the following conditions using a Metal weather ultra-accelerated weathering tester, and then the power generation output retention rates thereof were measured, and the appearances (color, film peeling, swelling, and others) were evaluated in the following four grades.

(test conditions)

Ultraviolet intensity: 50 (mW/cm)²)

L (light): the temperature is 60 ℃, the humidity is 39 percent, and the setting time is 4 hours

D (dew condensation): the temperature is 60 ℃, the humidity is more than 90 percent, and the set time is 4 hours

Total time at L and D: 8 hours

Irradiation was performed for a total of 10 units and 1200 hours with the above conditions as 1 cycle and a total of 15 cycles (120 hours) as a test time of 1 unit.

(appearance evaluation)

4: there was no change from the state before the start of measurement.

3: slight coloration was found.

2: yellowing was observed, and swelling and peeling of the film (flexible surface protective film layer) were observed to occur locally in the sample.

1: yellowing was observed, and the film was found to bulge and peel off over the entire sample.

Example 1

The flexible solar cell module is obtained by arranging solar cells having 10 unit cells each having a width of 260mm and a length of 80mm in series, assembling the solar cells with 1 collecting connector, and laminating and integrating the flexible solar cell module on the central portion of a flexible water-repellent support film having a width of 1000mm and a length of 1500mm via an adhesive resin described later.

As the adhesive resin, an acrylic resin crosslinked by a coupling agent compound (for example, an epoxy silane coupling agent) and an epoxy resin (for example, a urethane-modified epoxy resin) is used.

The fiber cloth for base cloth as the flexible waterproof supporting film material is formed by using polyester fiber yarn(fiber thickness: 84dtex) plain woven base fabric for warp and weft (mass per unit area: 160 g/m)²Density: 40 warps/25.4 mm and 50 wefts/25.4 mm). The flexible waterproof resin film described below is bonded to the base cloth of the flexible waterproof support film material.

The following polyvinyl chloride resin composition was kneaded and rolled by a roll forming method to obtain a flexible water-repellent resin film having a thickness of 0.15 mm. The film was thermally pressed at 165 ℃ for 2 minutes on the surface of the base fabric to prepare a flexible water-repellent support film. The mass per unit area of the film material is 500g/m²。

Furthermore, a vinylidene fluoride resin solution was applied to the surface of the flexible water repellent support film to form a stain-proofing layer having a thickness of about 10 μm.

Vinyl chloride resin 100 parts by weight

50 parts by weight of phthalate plasticizer

15 parts by weight of phosphate plasticizer

Epoxy compound 3 parts by weight

Ba-Ca stabilizer 1 weight part

Aromatic isocyanate Compound 5 parts by weight

0.1 part by weight of benzotriazole ultraviolet absorber

Pigment (titanium oxide) 5 parts by weight

A flexible element in which an amorphous silicon solar cell is laminated on a thin film substrate is used as a solar cell.

The conductive portion moisture-proof layer was formed by covering the entire surface of the positive and negative electrode conductive portions of the flexible solar cell module with an aluminum vapor-deposited polyester film (thickness: 50 μm, thickness of aluminum vapor-deposited layer: 60 nm).

The flexible adhesive resin layer was formed using a crosslinkable ethylene-vinyl acetate copolymer resin sheet (having an area of 120% with respect to the area of the solar cell layer) having a thickness of 0.6mm, a width of 300mm and a length of 890 mm.

A flexible surface protection sheet layer was formed using a fluorine-based resin film (area corresponding to 150% of the area of a solar cell) having a thickness of 50 μm, a width of 340mm and a length of 970mm, and a crosslinkable adhesive resin was applied to the back surface of the surface protection film layer.

In addition, a chlorotrifluoroethylene film is used as the surface protective film. Further, corona treatment is performed as a pretreatment to improve adhesiveness.

As the crosslinkable adhesive resin, an acrylic resin containing a primary amino group, which is obtained by crosslinking with a crosslinking agent containing an epoxy resin (e.g., urethane-modified epoxy resin) and a coupling agent compound (e.g., epoxy silane coupling agent), is used.

After corona treatment of the back surface of the chlorotrifluoroethylene film, the crosslinkable adhesive resin solution was further gravure-coated to form an adhesive layer having a thickness of 10 μm after drying.

The method for manufacturing the flexible adhesive resin film includes the steps of covering a solar cell layer disposed and bonded to a central portion of the flexible water-repellent support film with the crosslinkable ethylene-vinyl acetate copolymer resin sheet for the flexible adhesive resin layer, bonding an edge portion of the sheet extending outward of the solar cell layer to the flexible water-repellent support film, and covering the flexible water-repellent support film with a fluorine-based resin film for a flexible surface protective film having the crosslinkable adhesive resin layer, thereby bonding the crosslinkable adhesive resin layer to the flexible adhesive resin layer, and bonding an edge portion of the film extending outward of the flexible adhesive resin layer to the flexible water-repellent support film via the crosslinkable adhesive resin layer.

The laminate thus formed was heated in vacuum at a temperature of 160 ℃ and under a vacuum of 1Torr for 10 minutes to bond and integrate all the layers, thereby producing a flexible film-like solar cell laminate, which was used in the above test.

By the vacuum heating, the crosslinkable ethylene-vinyl acetate copolymer resin sheet for the flexible adhesive resin layer is melted, and the gap space between the solar cell layer and the crosslinkable adhesive resin layer under the flexible surface-protecting film layer is filled and crosslinked and cured.

The test results are shown in table 1.

Example 2

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the flexible surface protection film layer was formed using an ethylene-tetrafluoroethylene copolymer film (thickness 50 μm) having an area of 150% with respect to the area of the solar cell layer.

The test results are shown in table 1.

Example 3

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the flexible surface protection film layer was formed of a polyvinyl fluoride film (thickness: 50 μm) having an area of 150% with respect to the area of the solar cell layer.

The test results are shown in table 1.

Example 4

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, a flexible surface protection film layer was formed using a laminated film obtained by laminating a silicon oxide vapor-deposited polyester film (thickness: 12 μm) on a polyvinylidene fluoride film (thickness: 50 μm) via an acrylic adhesive containing a benzotriazole-based ultraviolet absorber, the laminated film having an area of 150% with respect to the area of the solar cell layer.

The test results are shown in table 1.

Example 5

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, as the crosslinkable adhesive resin, a chlorotrifluoroethylene-vinyl copolymer resin containing a hydroxyl group and a carboxyl group, which is crosslinked by an epoxy silane coupling agent and a blocked isocyanate compound, is used.

The test results are shown in table 1.

Example 6

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, as the moisture-proof film for the conductive portion moisture-proof layer, a laminated film in which an aluminum foil having a thickness of 50 μm is laminated and bonded 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

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, as the flexible waterproof supporting film material, the following film materials (mass per unit area: 500 g/m) were used²): this film material was produced by laminating an ethylene-vinyl acetate copolymer resin composition film (thickness: 0.17mrn) obtained by kneading and calendering a composition having the following composition by a calendering method on the surface of a polyester plain woven fabric base fabric similar to that of example 1, and pressing and pressure-bonding the film at 130 ℃ for 2 minutes.

(ethylene-vinyl acetate copolymer resin composition)

Ethylene-vinyl acetate copolymer resin 100 parts by weight

0.5 part by weight of stabilizer (phenolic compound)

Pigment (titanium oxide) 5 parts by weight

The test results are shown in table 1.

Example 8

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, a crosslinkable ethylene-vinyl acetate copolymer resin sheet (having an area of 120% with respect to the area of the solar cell layer) having a thickness of 0.6mm, a width of 300mm and a length of 890mm was coated on the front and back surfaces of the solar cell layer, and a flexible adhesive resin layer was provided on both surfaces of the solar cell layer. The test results are shown in table 1.

Example 9

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the partial aluminum-deposited polyester film covering of the anode conductive portion and the cathode conductive portion is omitted. Instead, a silicon oxide vapor-deposited polyester film (width 300mm, length 890mm, thickness 50 μm, thickness of silicon oxide vapor-deposited layer: 60nm) was used as the anode and cathode conductive portion covering layers, the entire surface including the anode conductive portion, the cathode conductive portion and the solar cell was covered (having an area of 120% with respect to the area of the solar cell layer), and a conductive portion moisture-proof layer constituting a continuous covering layer was formed to extend further to the surface of the flexible water-proof support film material. The test results are shown in table 1.

Example 10

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the covering with the aluminum vapor-deposited polyester film was omitted in part of the anode conductive part and the cathode conductive part, and instead, a flexible adhesive resin layer was formed by covering a cross-linkable ethylene-vinyl acetate copolymer resin sheet (having an area of 120% with respect to the area of the solar cell layer) having a thickness of 0.6mm, a width of 300mm and a length of 890mm, and a silicon oxide vapor-deposited polyester film (having a width of 300mm, a length of 890mm, a thickness of 50 μm and a thickness of a silicon oxide vapor-deposited layer: 60nm) was further provided over the entire surface of the flexible adhesive resin layer, thereby forming a conductive part moisture-proof layer in which the anode conductive part and the cathode conductive part were indirectly covered with a moisture-proof layer. The test results are shown in table 1.

Comparative example 1

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the conductive part moisture-proof layer is not covered on the positive and negative electrode conductive parts.

The test results are shown in table 1.

Reference example 1

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the flexible adhesive resin layer including the crosslinkable ethylene-vinyl acetate copolymer resin sheet has the same area as the total surface area of the solar cell layer, and does not cover the peripheral side portion of the solar cell layer.

The test results are shown in table 1.

Comparative example 2

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, the flexible adhesive resin layer is 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

A flexible film-like solar cell multilayer body was produced in the same manner as in example 1 and used for the test. However, no crosslinkable adhesive resin layer was formed.

The test results are shown in table 1.

TABLE 1

Claims (12)

1. A flexible film-like solar cell laminate, comprising:

a flexible waterproof support film (5);

a solar cell layer (1) which is disposed on the inner side of the flexible waterproof supporting film material, leaving the edge of the flexible waterproof supporting film material;

a flexible surface protection film layer (10) which covers the entire surface of the solar cell layer, further continuously extends to the outside of the solar cell layer, and is bonded to the edge portion of the flexible waterproof support film material, wherein the thickness of the flexible surface protection film layer (10) is 0.03-0.5 mm; and the number of the first and second groups,

a flexible adhesive resin layer (9) which bonds the entire surface of the solar cell layer covered with the flexible surface protective film layer and an edge portion of the flexible waterproof support film material to the flexible surface protective film layer;

the solar cell layer (1) comprises more than 1 flexible solar cell modules (1A);

each solar cell module (1A) comprises more than 1 solar cell (1A) and 1 collecting connector (1 b);

an anode collector (3) and a cathode collector (4) which form 1 pair are arranged on the current collection connector (1 b);

the solar cell (1a) is connected to the anode collector via an anode conductive part (7a) and to the cathode collector via a cathode conductive part (7 b); and the number of the first and second electrodes,

at least the anode conductive part (7a) and the cathode conductive part (7b) are covered with a conductive part moisture-proof layer (8) directly or indirectly via the flexible adhesive resin layer (9),

the conductive section moisture-proof layer (8) is formed of at least one film selected from the group consisting of a metal vapor-deposited polyester film, a laminated film of a metal layer and an insulating resin film, and a metal oxide vapor-deposited polyester film.

2. The flexible film-like solar cell laminate according to claim 1, wherein 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 flexible adhesive resin layer covering the solar cell layer is completely covered and further extended to the outside of the flexible adhesive resin layer, being bonded to the flexible water-repellent support film.

3. The flexible film-like solar cell laminate according to claim 1 or 2, wherein the flexible surface protective film layer (10) comprises at least 1 layer of a transparent fluorine-containing resin film, a transparent metal oxide-deposited polyester film, and an ultraviolet-shielding adhesive layer bonding these to each other.

4. The flexible film-like solar cell laminate according to claim 1, wherein the flexible adhesive resin layer (9) is formed of a film of a crosslinked resin containing a crosslinkable ethylene-vinyl acetate copolymer, covers at least the total surface area of the surface side of the solar cell layer, and further extends to the outside of the solar cell layer to be bonded to the flexible water-repellent support film.

5. The flexible film-like solar cell laminate according to claim 4, wherein the flexible adhesive resin layer (9) further extends between the solar cell layer (1) and the flexible water-repellent support film (5) to bond the back surface side of the solar cell layer to the flexible water-repellent support film.

6. The flexible film-like solar cell laminate according to claim 1, wherein the solar cell layer (1) comprises a plurality of flexible solar cell modules (1A) each separately arranged and bonded on an inner side portion of the flexible waterproof support film (5); the flexible surface protective film layer covers each flexible solar cell module, further extends to the outside of the flexible solar cell module, and is joined to the flexible waterproof support film material.

7. The flexible film-like solar cell complex according to claim 1, wherein the anode conductive part (7a) and the cathode conductive part (7b) are directly covered with the conductive part moisture-proof layer (8), respectively.

8. The flexible film-like solar cell laminate according to claim 7, wherein the conductive part moisture-proof layer (8) directly covering the anode conductive part (7a) and the cathode conductive part (7b) has conductive part moisture-proof layer extension parts (8f, 8g) further extending between the flexible adhesive resin layer (9) and the solar cell layer (1) and between the flexible adhesive resin layer (9) and the flexible water-proof support film (5), respectively.

9. The flexible film-like solar cell laminate according to claim 1, wherein 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 indirectly covered with the conductive portion moisture-proof layer (8) via the flexible adhesive resin layer (9).

10. The flexible film-like solar cell laminate according to claim 1 or 2, wherein the flexible surface protective film layer (10) and the flexible adhesive resin layer (9), and the flexible surface protective film layer (10) and an edge portion of the flexible water-repellent support film material (5) are bonded via a crosslinkable adhesive resin layer (6), respectively.

11. The flexible film-like solar cell laminate according to claim 10, wherein the crosslinkable adhesive resin layer (6) contains a cured product of one or more crosslinking agents selected from the group consisting of an epoxy resin, an isocyanate compound, and a coupling agent compound.

12. The flexible film-like solar cell laminate according to claim 10, wherein the crosslinkable adhesive resin layer (6) contains any one of an acrylic resin having a primary amine group or a fluoroolefin-vinyl copolymer resin having a hydroxyl group and a carboxyl group.