JP2016047003A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module in which an energy collecting line and a connection cable in a module can be easily connected, even after installation of the solar cell module at an object.SOLUTION: A solar battery module includes at least a photoelectric conversion element and an energy collecting line for taking out an electricity having been converted by the photoelectric conversion element to the outside, with the energy collecting line electrically connected to a connection cable terminal. In the solar battery module, the connection cable terminal is pressed against the energy connecting line so that the connection cable terminal is electrically connected to the energy collecting line.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a solar cell module, and more particularly, to a collector line for extracting electricity from a solar cell and a solar cell module characterized by a connection structure of the electric extraction cable.

  Solar cells are attracting attention as a clean energy source, and various studies are being conducted. Crystalline solar cells are used as high-power solar cells such as mega solar, while thin-film solar cells such as amorphous silicon solar cells and organic thin-film solar cells also exist. Thin-film solar cells are lightweight, thin, flexible, and inexpensive to manufacture. Therefore, thin-film solar cells are attached to the exterior walls and windows of buildings, or to interiors such as curtains, in addition to power supply.

  In a solar cell, normally, electricity converted by a photoelectric conversion element is collected by a collecting wire, connected to an external cable in a terminal cover called a junction box, and electricity is taken out (see, for example, Patent Document 1). The terminal cover is generally installed on the back side (non-light-receiving surface side) of the solar cell.

JP 2004-235189 A

Since the terminal cover that covers the electrical extraction structure has a structure in which the current collector and the cable terminal are electrically connected, the terminal cover becomes bulky to some extent. On the other hand, the thin film solar cell module is a flexible film-like solar cell module, and is applied to an outer wall, a window, a roofing material, an interior, and the like. When the inventors actually tried to install a flexible film-like solar cell module, the presence of a terminal cover, an electric extraction cable, or the like sometimes hindered the installation work. In other words, design is especially important when installing solar cell modules on exterior walls, windows, interiors, etc., and there are terminal covers and cables for electrical extraction in the work to install cleanly and without wrinkles. Could get in the way.
The present invention solves such a problem, and even after the solar cell module is installed on an object to be installed, the solar cell module can be easily connected to the current collecting line of the solar cell module and the connection cable for electrical extraction. A battery module is provided.

  As a result of studying the above problems, the present inventors have adopted a structure in which the terminal of the connection cable is pressed against the current collector and the connection cable terminal and the current collector are electrically connected to each other. It was conceived that the solar cell module current collector and the connection cable can be easily connected even after the device is installed on the object.

  The present invention is a solar cell module comprising at least a photoelectric conversion element and a current collecting line for taking out the electricity converted by the photoelectric conversion element, and the current collecting line is electrically connected to a connection cable terminal, wherein the connection cable It is a solar cell module in which a connection cable terminal and a collector line are electrically connected by pressing a terminal against the collector line.

In addition, the connection cable terminal has a terminal cover fixed to the solar cell module, and the connection cable terminal and the collector wire are electrically connected by fixing the terminal cover and the solar cell module. It is preferable.
Moreover, the aspect in which the said connection cable terminal and the said collector wire are connected inside the sealing structure of a solar cell module is preferable, and the said connection cable terminal and the said collector wire are connected outside a solar cell module, The said collector wire The aspect by which at least one part is covered with the insulating resin among the locations which exist outside the sealing structure of a solar cell module is preferable.

The terminal cover and the solar cell module are preferably fixed by an adhesive layer, and the terminal cover and the solar cell module are preferably fixed by a fitting structure.
Moreover, it is preferable that it is a thin film solar cell module, it is preferable that it has flexibility, and it is preferable that it is an organic thin film solar cell.

  Another embodiment of the present invention is a method of connecting a collector wire and a connection cable terminal of a solar cell module, comprising at least a photoelectric conversion element and a collector wire for taking out electricity converted by the photoelectric conversion element to the outside. A step of preparing a solar cell module and a connection cable terminal that can be electrically connected to the current collector of the solar cell module, and pressing the connection cable terminal against the current collector to electrically connect the connection cable and the current collector And connecting them to each other.

According to the solar cell module of the present invention, it is possible to provide a solar cell module that can easily connect the current collector and the connection cable in the module even after the solar cell module is installed on the object to be installed. In particular, since the current collector and the connection cable are conventionally connected in the terminal cover by a sandwiching structure, a screw structure, etc., there is a certain amount of work for the connection. However, by adopting the structure of the present invention, it is possible to connect only by pressing the connection cable terminal against the current collector, and the connection becomes extremely easy. Moreover, according to the solar cell module of this invention, it is not necessary to use solder for the connection between the current collector and the connection cable, and a solder-free solar cell module can be provided.
Moreover, since it connects with a connection cable terminal after installing a solar cell module, when sticking to an outer wall or a window, it becomes easy to install cleanly and without a wrinkle. In addition, particularly in one aspect of the present invention, since the connecting portion of the current collector with the external cable terminal is not the end of the current collector, air bubbles are generated by the spatula when the solar cell module is attached in consideration of design. Even if the work of removing is performed, it is possible to prevent the collector line from being damaged by the stress generated at that time.

In 1st and 2nd embodiment of this invention, it is the schematic diagram which looked at the solar cell module before fixing a terminal cover from the upper surface. It is a schematic diagram which shows the cross-sectional structure of AA 'of FIG. It is a cross-sectional schematic diagram explaining the 1st Embodiment of this invention. (A) shows a state before the solar cell module and the terminal cover are fixed, and (b) shows a state where the solar cell module and the terminal cover are fixed. It is a cross-sectional schematic diagram explaining the 2nd Embodiment of this invention. (A) shows a state before the solar cell module and the terminal cover are fixed, and (b) shows a state where the solar cell module and the terminal cover are fixed. In 3rd and 4th embodiment of this invention, it is the schematic diagram which looked at the solar cell module before fixing a terminal cover from the upper surface. It is a schematic diagram which shows the cross-sectional structure of AA 'of FIG. It is a cross-sectional schematic diagram explaining the 3rd Embodiment of this invention. (A) shows a state before the solar cell module and the terminal cover are fixed, and (b) shows a state where the solar cell module and the terminal cover are fixed. It is a cross-sectional schematic diagram explaining the 4th Embodiment of this invention. (A) shows a state before the solar cell module and the terminal cover are fixed, and (b) shows a state where the solar cell module and the terminal cover are fixed. In the 5th and 6th embodiment of this invention, it is the schematic diagram which looked at the solar cell module before fixing a terminal cover from the upper surface. It is a schematic diagram which shows the cross-sectional structure of AA 'of FIG. It is a cross-sectional schematic diagram explaining the 5th Embodiment of this invention. (A) shows a state before the solar cell module and the terminal cover are fixed, and (b) shows a state where the solar cell module and the terminal cover are fixed. It is a cross-sectional schematic diagram explaining the 6th Embodiment of this invention. (A) is a state before a solar cell module and a connection cable terminal are connected, (b) shows a state where a solar cell module and a connection cable terminal are connected. It is a cross-sectional schematic diagram explaining the 7th Embodiment of this invention. (A) is a state before a solar cell module and a connection cable terminal are connected, (b) shows a state where a solar cell module and a connection cable terminal are connected. It is an upper surface schematic diagram of the solar cell module which shows the application example of this invention.

The solar cell module of the present invention is a solar cell module including at least a photoelectric conversion element and a current collecting line for taking out electricity converted by the photoelectric conversion element, and the current collecting line is electrically connected to a connection cable terminal. In one embodiment, the connection cable terminal has a terminal cover fixed to the solar cell module.
The present invention is preferably a thin-film solar cell module because it can be suitably applied to the installation of a thin-film solar cell module that can also be installed on an outer wall, a window, or an interior. The organic thin-film solar cell is preferably flexible. It is more preferable that

<Photoelectric conversion element>
The photoelectric conversion element is an element that generates power based on sunlight. The type of the photoelectric conversion element is not particularly limited as long as it can convert light energy into electric energy and can extract the electric energy obtained by the conversion to the outside.
In the present invention, the photoelectric conversion element is preferably a thin film photoelectric conversion element, and more preferably an organic thin film photoelectric conversion element. Since it is a thin film photoelectric conversion element, it can be installed in a place where it is flexible, that is, installed in a bent state, stored in a bent state, and deformed in an installed state.

  As a photoelectric conversion element, a pair of electrodes sandwiching a photoelectric conversion layer, a pair of electrodes sandwiching a laminate of a photoelectric conversion layer and another layer (buffer layer, etc.), a plurality of such elements, Those connected in series can be used. Examples of the material used for the photoelectric conversion layer include thin film single crystal silicon, thin film polycrystalline silicon, amorphous silicon, microcrystalline silicon, spherical silicon, an inorganic semiconductor material, an organic dye material, and an organic semiconductor material. By using these materials, it is possible to realize a thin (light) photoelectric conversion element with relatively high power generation efficiency. Further, from the viewpoint of increasing efficiency, a HIT type or a tandem type in which these are laminated may be used.

  When the photoelectric conversion layer is a thin-film polycrystalline silicon layer, the photoelectric conversion element is an element that uses indirect optical transition. Therefore, when the photoelectric conversion layer is a thin-film polycrystalline silicon layer, in order to increase light absorption, a sufficient light confinement structure, such as an element substrate to be described later or an uneven structure formed on the surface thereof, should be provided. Is preferred.

When the photoelectric conversion layer is an amorphous silicon layer, a photoelectric conversion element that has a large optical absorption coefficient in the visible region and can sufficiently absorb sunlight even with a thin film having a thickness of about 1 μm can be realized. Moreover, since amorphous silicon is an amorphous material, it is resistant to deformation. Therefore, when the photoelectric conversion layer is an amorphous silicon layer, a particularly light-weight solar cell module having a certain degree of resistance to deformation can be realized.

When the photoelectric conversion layer is an inorganic semiconductor material (compound semiconductor) layer, a photoelectric conversion element with high power generation efficiency can be realized. From the viewpoint of power generation efficiency (photoelectric conversion efficiency), the power generation layer is preferably a chalcogenide-based photoelectric conversion layer containing a chalcogen element such as S, Se, Te, and the I-III-VI group 2 semiconductor system (chalcopyrite system) ) More preferably a photoelectric conversion layer, a Cu-III-VI group 2 semiconductor power generation layer using Cu as a group I element, particularly a CIS-based semiconductor [CuIn (Se _1-y S _y ) ₂ ; 0 ≦ y ≦ 1] layer or CIGS semiconductor [Cu (In _1−x G _x ) (Se _1−y S _y ) ₂ ; 0 <x <1, 0 ≦ y ≦ 1] layer is preferable.

Even when a dye-sensitized photoelectric conversion layer including a titanium oxide layer and an electrolyte layer is employed as the photoelectric conversion layer, a photoelectric conversion element with high power generation efficiency can be realized.
An organic semiconductor layer (a layer including a p-type semiconductor and an n-type semiconductor) can also be employed as the photoelectric conversion layer. The organic semiconductor layer is preferable in that it can be formed efficiently and the design property is excellent because the photoelectric conversion layer has various colors.
For the above reasons, the photoelectric conversion element is preferably an organic thin film photoelectric conversion element employing an organic semiconductor layer as the photoelectric conversion layer. Hereinafter, the organic semiconductor layer will be described.

  Specific examples of the structure of the organic semiconductor layer include a bulk heterojunction type having a layer (i layer) in which a p-type semiconductor and an n-type semiconductor are phase-separated in the layer, a layer containing a p-type semiconductor (p layer), and n, respectively. A layered type (hetero pn junction type), a PIN type, a Schottky type, and a combination thereof in which layers (n layers) including a type semiconductor are stacked can be given. Among these, a bulk heterojunction type is preferable.

  A p-type semiconductor compound is a material that operates as a p-type semiconductor whose film can transport holes, but a π-conjugated polymer material or a π-conjugated low-molecular organic compound is preferably used. A mixture of these compounds may also be used. The conjugated polymer material is obtained by polymerizing a single or a plurality of π-conjugated monomers, and the monomers include thiophene, fluorene, carbazole, diphenylthiophene, dithienothiophene, dithienosilole, dithieno which may have a substituent. Examples include cyclohexane, benzothiadiazole, thienothiophene, imidothiophene, benzodithiophene, and the like, and the molecular weight is 10,000 or more. These monomers may be directly bonded or may be bonded via CH═CH, C≡C, N, or O. Low molecular organic semiconductor materials include condensed aromatic hydrocarbons such as pentacene and naphthacene, oligothiophenes bonded with 4 or more thiophene rings, porphyrin compounds, tetrabenzoporphyrin compounds and their metal complexes, phthalocyanine compounds and their metal complexes, etc. .

The n-type semiconductor compound is not particularly limited, and examples thereof include fullerene compounds and derivatives thereof, and condensed ring tetracarboxylic acid diimides. Examples of fullerenes include C60 or C70, and those obtained by adding a substituent to two carbons of the fullerene, those having a substituent added to four carbons, and further adding a substituent to six carbons. Things. In order for the fullerene compound to be applicable to a coating method, the fullerene compound is preferably highly soluble in some solvent and can be applied as a solution.
When an organic semiconductor layer is used for the power generation layer, it is preferable to stack a hole extraction layer and / or an electron extraction layer.

The material of the hole extraction layer is a conductive polymer in which polythiophene, polypyrrole, or polyaniline is doped with sulfonic acid and / or halogen, or a metal oxide having a large work function such as molybdenum oxide or nickel oxide. Used.

  Although the material of an electron extraction layer is not specifically limited, Specifically, an inorganic compound or an organic compound is mentioned. Examples of the inorganic compound include alkali metal salts such as LiF, and n-type oxide semiconductors such as titanium oxide (TiOx) and zinc oxide (ZnO). Examples of the organic compound include phenanthrene derivatives such as bathocuproine (BCP) and bathophenanthrene (Bphen), and phosphine compounds having a P═O or P═S structure. Among them, an aromatic hydrocarbon group or an aromatic group is included in the phosphorus atom. A heterocyclic group phosphine compound is preferred.

Each electrode of the photoelectric conversion element can be formed using one or more kinds of arbitrary materials having conductivity. Examples of the electrode material (electrode constituent material) include metals such as platinum, gold, silver, aluminum, chromium, nickel, copper, titanium, magnesium, calcium, barium, sodium, and alloys thereof; indium oxide and tin oxide Metal oxides such as, or alloys thereof (ITO: indium tin oxide); conductive polymers such as polyaniline, polypyrrole, polythiophene, polyacetylene; acids such as hydrochloric acid, sulfuric acid, sulfonic acid, etc. Incorporating dopants such as Lewis acids such as FeCl ₃ , halogen atoms such as iodine, metal atoms such as sodium and potassium, etc .; conductive particles such as metal particles, carbon black, fullerene, carbon nanotubes, etc. Examples thereof include a conductive composite material dispersed in a matrix.

  The electrode material is preferably a material suitable for collecting holes or electrons. Examples of the electrode material suitable for collecting holes (that is, a material having a high work function) include gold and ITO. Examples of the electrode material suitable for collecting electrons (that is, a material having a low work function) include silver and aluminum.

  Each electrode of the photoelectric conversion element may be substantially the same size as the photoelectric conversion layer or may be smaller than the photoelectric conversion layer. However, when the electrode on the light receiving surface side of the photoelectric conversion element is relatively large (the area is not sufficiently small compared to the photoelectric conversion layer area), the electrode is transparent ( The electrode should have a relatively high transmittance (for example, 50% or more) for light having a wavelength that allows the photoelectric conversion layer to efficiently convert it into electrical energy. Examples of the transparent electrode material include oxide metal thin films such as ITO and IZO (indium oxide-zinc oxide).

  The thickness of each electrode of the photoelectric conversion element and the thickness of the photoelectric conversion layer can be appropriately determined based on the required output and the like. Further, an auxiliary electrode may be provided so as to be in contact with the electrode. In particular, it is effective when using a slightly conductive electrode such as ITO. As the auxiliary electrode material, the same material as the above metal material can be used as long as the conductivity is good, and silver, aluminum and copper are exemplified.

  The element substrate is a member on which a photoelectric conversion element is formed on one surface thereof. Therefore, it is desired that the element substrate has a relatively high mechanical strength, is excellent in weather resistance, heat resistance, chemical resistance, and the like and is lightweight. It is also desired that the element substrate has a certain degree of resistance to deformation. Therefore, it is preferable to employ a metal foil, a resin film having a melting point of 85 to 350 ° C., or a laminate of several metal foils / resin films as the element base, and the element base is a resin film, that is, a resin base. More preferably, it is a material.

Examples of the metal foil that can be used as the element substrate (or a component thereof) include foils made of aluminum, stainless steel, gold, silver, copper, titanium, nickel, iron, and alloys thereof.
The resin film having a melting point of 85 to 350 ° C includes polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate, polyacetal, acrylic resin, polyamide resin, ABS resin, ACS resin. , AES resin, ASA resin, copolymers thereof, fluorine resin such as PVDF, PVF, silicone resin, cellulose, nitrile resin, phenol resin, polyurethane, ionomer, polybutadiene, polybutylene, polymethylpentene, polyvinyl alcohol, polyarylate, Examples thereof include films made of polyetheretherketone, polyetherketone, polyethersulfone and the like. The resin film used as the element substrate may be a film in which glass fibers, organic fibers, carbon fibers and the like are dispersed in the resin as described above.

  In addition, when the melting point of the resin film used as the element substrate (or its constituent elements) is in the range of 85 to 350 ° C., the element substrate does not deform and does not peel off from the photoelectric conversion element. ,preferable. Further, the melting point of the resin film used as the element substrate (or its constituent elements) is more preferably 100 ° C. or higher, further preferably 120 ° C. or higher, and particularly preferably 150 ° C. or higher. Most preferably, it is 180 ° C. or higher. The melting point of the resin film is more preferably 300 ° C. or less, further preferably 280 ° C. or less, and particularly preferably 250 ° C. or less.

<Collector>
The current collector is a conducting wire that is connected to the electrode of the photoelectric conversion element and takes out the electricity converted by the photoelectric conversion element. At least a part of the current collecting line is connected to the connection cable terminal.
As a material for the current collector, metals, alloys, and the like are often used, and among them, it is preferable to use copper, aluminum, silver, gold, nickel, or the like having a low resistivity. Among these, copper and aluminum are particularly preferable because they are inexpensive. In order to prevent rust, the current collector may be plated with tin, silver or the like, the surface may be coated with resin, or a film may be laminated. As the shape of the current collector, there are a flat wire, foil, flat plate, wire, and mesh, but for reasons such as securing a bonding area, it is preferable to use a flat wire, foil, or flat plate.
“Foil” refers to a material having a thickness of less than 100 μm, and “plate” refers to a material having a thickness of 100 μm or more. Further, the “flat wire” refers to a wire whose cross section is rolled to make the cross section into a quadrangle.

The thickness of the current collector is preferably 5 μm or more, more preferably 10 μm or more. Further, it is preferably 2 mm or less, more preferably 1 mm or less, and particularly preferably 300 μm or less. If the thickness is thinner than the above range, the resistance value of the current collector increases, and the generated power cannot be taken out efficiently. Further, if the thickness is larger than the above range, there is a risk that the solar cell module will increase in weight and the flexibility will decrease, the surface of the module will easily become uneven, and the production cost will increase. is there.
The width of the current collector is preferably 0.5 mm or more, more preferably 1 mm or more, and particularly preferably 2 mm or more. Moreover, it is preferable that the width | variety of a current collection line is 50 mm or less, More preferably, it is 20 mm or less, Most preferably, it is 10 mm or less. If the width of the current collecting line is narrower than the above range, the resistance value of the current collecting line increases, and the generated power cannot be efficiently taken out. In addition, the mechanical strength of the current collector decreases, which may cause breakage and the like. Moreover, when the width | variety of a current collection line is wider than the said range, the aperture ratio in the whole module will reduce, and there exists a possibility of leading to the fall of the power generation amount of a module.

The current collector is connected to the photoelectric conversion element, and the connection portion with the photoelectric conversion element is usually present inside the sealing structure of the solar cell module, but a part of the current collector is connected to the connection cable terminal for solar cells. It is exposed outside the sealing structure of the module. If the current collecting line is exposed at the time of construction, there is a possibility of breakage. Therefore, the exposed portion may be covered with an insulating resin.
The type of the insulating resin is not particularly limited, a known one can be used, and the coating method is not particularly limited. In addition, when the connection part with a connection cable terminal is covered with insulating resin among the current collection lines, it is necessary to peel off the connection part at the time of connection.
In addition, you may provide an electroconductive adhesive material in the connection part with a connection cable terminal among collector wires in order to ensure a connection. Examples of the conductive adhesive include a fiber-based double-sided conductive tape, a metal foil-based double-sided conductive tape, and an ACF (Anisotropic Conductive Film). Among these, a double-sided conductive tape is preferably used because heating is unnecessary in the bonding step and the process is simple.

  In a solar cell module, in order to protect the connection part of a current collection line and a connection cable terminal, a terminal cover may be provided. As the terminal cover, a commonly used one can be used, and it may be a box shape or simply a covering member or a patch tape. The terminal cover may be sealed with an insulating resin.

<Surface protective layer>
The surface protective layer is a layer for imparting mechanical strength, weather resistance, scratch resistance, chemical resistance, gas barrier properties and the like to the solar cell module. The surface protective layer is preferably one that does not interfere with light absorption of the photoelectric conversion element, that is, one that transmits light having a wavelength that can be efficiently converted into electric energy by the photoelectric conversion element. For example, the solar transmittance is 80%. Preferably, it is more than 85%.

Moreover, since a solar cell module is heated by sunlight, it is preferable that a surface protective layer has heat resistance. Therefore, the melting point of the constituent material of the surface protective layer is preferably 100 ° C. or higher, and more preferably 120 ° C. or higher.
The melting point of the constituent material of the surface protective layer is preferably 320 ° C. or lower, and more preferably 300 ° C. or lower.

The constituent material of the surface protective layer can be selected from various viewpoints. For example, polyethylene resin, polypropylene resin, cyclic polyolefin resin, AS (acrylonitrile-styrene) resin, ABS (acrylonitrile-butadiene-styrene) resin, polyvinyl chloride resin Polyester resin such as fluorine resin, polyethylene terephthalate, polyethylene naphthalate, phenol resin, polyacrylic resin, (hydrogenated) epoxy resin, polyamide resin such as various nylons, polyimide resin, polyamide-imide resin, polyurethane resin, cellulose Resin, silicon resin, polycarbonate resin, etc. can be used as the constituent material of the surface protective layer. In addition, when importance is attached to weather resistance, it is preferable to use a fluorine-based resin such as ETFE as a constituent material of the surface protective layer.
The surface protective layer may be composed of two or more materials. Moreover, it may be a single layer or a laminate comprising two or more layers.

  The thickness of the surface protective layer is not particularly defined, but the mechanical strength tends to increase by increasing the thickness, and the flexibility tends to increase by decreasing the thickness. Therefore, the thickness of the surface protective layer is usually 10 μm or more, preferably 15 μm or more, more preferably 20 μm or more, and usually 200 μm or less, preferably 180 μm or less, more preferably 150 μm or less.

<Back side protective layer>
The solar cell module has a back surface protective layer. The back surface protective layer is a layer having a weather resistance and impact resistance function.
The solar cell module according to the present embodiment preferably has flexibility, and the back protective layer is preferably a resin sheet.
Resin sheets include ethylene-tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy fluororesin (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), polychlorotrifluoroethylene (PCTFE). , Polycarbonate (PC), polyimide (PI), polystyrene (PS), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide (PA), polymethyl methacrylate (PMMA) Polyolefin elastomers, polyester elastomers, etc. are preferable as polyvinyl chloride resin (PVC) and thermoplastic elastomer (TPO), and ETFE, PC, PVC, TPO are particularly preferred because of their good mechanical properties and light resistance. PMMA is desirable.

The thickness of the back surface protective layer is usually 10 μm or more, preferably 50 μm or more, and usually 5 mm or less, preferably 3 mm or less, from the viewpoint of imparting lightness and flexibility.
The back surface protective layer may be a laminate in order to impart the required performance.
In addition, a module substrate can be provided separately from the back surface protective layer. As the module substrate, a substrate including a metal layer or a steel plate may be used. However, when flexibility is required, a resin substrate such as polycarbonate can be used.

<Encapsulant layer>
A sealing material layer is a layer provided in a solar cell module for the purpose of sealing a photoelectric conversion element.
The sealing material layer also contributes to improvements in mechanical strength, weather resistance, gas barrier properties, and the like. Further, since the sealing material layer is located on the light receiving surface side, it is preferable that the sealing material layer transmit visible light and has high heat resistance. It is also possible to add other optical functions or mechanical functions to the sealing material layer. Examples of the optical function that can be added to the sealing material layer include a light confinement function and a wavelength conversion function, and examples of the mechanical function include a cushion function.

  The material for the sealing material layer should be selected in consideration of the above matters. Specific examples of the material of the sealing material layer include ethylene-vinyl acetate copolymer (EVA) resin, polyolefin resin, AS (acrylonitrile-styrene) resin, ABS (acrylonitrile-butadiene-styrene) resin, polyvinyl chloride resin. , Fluorinated resins, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, phenolic resins, polyacrylic resins, polymethacrylic resins, chloroprene resins, (hydrogenated) epoxy resins, polyamide resins such as various nylons, polyimide resins , Polyamide-imide resin, polyurethane resin, cellulose resin, silicon resin, polycarbonate resin and the like.

  Among them, an ethylene copolymer resin is preferable, and more preferable is an ethylene-vinyl acetate copolymer (EVA) resin or a polyolefin resin (copolymer of ethylene and other olefins) ( Propylene / ethylene / α-olefin copolymer, ethylene / α-olefin copolymer, etc.).

  The thickness of the sealing material layer is usually 30 μm or more, preferably 50 μm or more, more preferably 120 μm or more, most preferably 150 μm or more, and further preferably 200 μm or more. Moreover, it is 800 micrometers or less normally, it is preferable that it is 700 micrometers or less, and it is more preferable that it is 600 micrometers or less. Most preferably, it is 280 micrometers or less. If the value is below the lower limit, the solar cell may be damaged due to deformation at the time of sticking to the outer wall or window. On the other hand, when the upper limit is exceeded, the solar cell may be damaged when the connection cable terminal and the collector line are electrically connected. In addition, the said range means the thickness of each sealing material layer, when multiple sealing material layers exist.

<Adhesive layer>
The solar cell module of the present invention preferably has an adhesive layer as the outermost layer. By having an adhesive layer, it can be easily installed on the outer wall, and can also be used by attaching it to a window or the like as an indoor interior. The adhesive layer is not particularly limited as long as it has adhesiveness and is transparent, and for example, modified with ethylene-vinyl acetate copolymer (EVA) resin, polyvinyl butyral (PVB) resin, maleic acid, silane, or the like. A light transmissive material such as a polyethylene resin, a modified polypropylene resin, an epoxy adhesive, or a urethane adhesive is used.
The film thickness of the adhesive layer is not particularly limited as long as it is sufficient to attach the solar cell module to an installation such as an outer wall or a window, but is usually 10 μm or more, preferably 50 μm or more, more The thickness is preferably 80 μm or more, and is usually 500 μm or less, preferably 300 μm or less, more preferably 200 μm or less.

<Other layers>
The solar cell module can be provided with other layers as required. Examples include an insulating layer, a buffer layer, a reinforcing layer, a gas barrier layer, an ultraviolet cut layer, and the like.

<Method for manufacturing solar cell module>
A known method can be used as a method for manufacturing a solar cell module, and includes, for example, a surface protective layer, a sealing material layer, a photoelectric conversion element, a sealing material layer, and a back surface protective layer, and a collector wire is connected to the photoelectric conversion element. The solar cell module can be obtained by placing the multilayer sheet in a vacuum lamination apparatus, heating it after evacuation, and cooling it after a predetermined time.

The said hot press conditions are not specifically limited, It can implement on the conditions performed normally.
It is preferably performed under vacuum conditions, and the degree of vacuum is usually 30 Pa or more, preferably 50 Pa or more, more preferably 80 Pa or more. On the other hand, the upper limit is usually 150 Pa or less, preferably 120 Pa or less, more preferably 100 Pa or less. By setting it as the said range, since generation | occurrence | production of a bubble can be suppressed in each layer in a module and productivity is also improved, it is preferable.

  The vacuum time is usually 1 minute or longer, preferably 2 minutes or longer, more preferably 3 minutes or longer. On the other hand, the upper limit is usually 30 minutes or less, preferably 20 minutes or less, more preferably 10 minutes or less. Setting the vacuum time in the above range is preferable because the appearance of the solar cell module after hot pressing is improved and the generation of bubbles in each layer in the module can be suppressed.

  The press condition of the hot press is usually a pressure of 50 kPa or more, preferably 70 kPa or more, more preferably 90 kPa or more. On the other hand, the upper limit value is preferably 101 kPa or less. By setting it as the pressurization conditions of the said range, since moderate adhesiveness can be acquired, without damaging a solar cell module, it is preferable also from a durable viewpoint.

  The holding time of the pressure is usually 1 minute or longer, preferably 3 minutes or longer, more preferably 5 minutes or longer. On the other hand, the upper limit is usually 30 minutes or less, preferably 20 minutes or less, more preferably 15 minutes or less. By setting it as the said holding time, the function which protects the electric power generating element of a sealing layer can fully be exhibited, and sufficient adhesive strength can be obtained.

  The temperature condition of the hot press is usually 120 ° C. or higher, preferably 130 ° C. or higher, more preferably 140 ° C. or higher. On the other hand, the upper limit is usually 180 ° C. or lower, preferably 160 ° C. or lower, more preferably 150 ° C. or lower. By setting the temperature range, sufficient adhesive strength can be obtained.

Moreover, the heating time of the said temperature is 10 minutes or more normally, Preferably it is 12 minutes or more, More preferably, it is 15 minutes or more. On the other hand, the upper limit is 60 minutes or less, preferably 45 minutes or less, more preferably 30 minutes or less. By setting it as the said heating time, since durability of a sealing material is bridge | crosslinked moderately and it can have moderate softness | flexibility, it is preferable.

  Hereinafter, the solar cell module of the present invention will be described more specifically with reference to the drawings. However, the present invention is not limited to the contents described below, and can be arbitrarily modified and implemented without changing the gist thereof. Is possible. In addition, the drawings used for the description all schematically show the solar cell module or its constituent members according to the present invention, and are partially emphasized, enlarged, reduced, omitted or the like for deepening the understanding. In some cases, it does not accurately represent the scale or shape of each component. Furthermore, the various numerical values used in the description with reference to the drawings are only examples, and can be variously changed as necessary.

FIG. 1 is a schematic top view of solar cell modules according to the first and second embodiments of the present invention.
In the solar cell module shown in FIG. 1, an organic semiconductor cell 14 in which a plurality of organic semiconductor cells are monolithically connected is used as a photoelectric conversion element, and current collectors 15 are arranged at both ends (upper and lower) and laminated. It is the manufactured organic thin film solar cell module 10.
Since the current collecting wire 15 is laminated while being connected to the organic semiconductor cell 14, it is covered with a sealing material layer or a surface protective layer immediately after lamination. On the other hand, the end of the collector line 15 is electrically connected to a terminal of a connection cable (not shown). In order to connect to the connection cable, it is necessary to expose the current collector 15, and an exposed portion 16 is provided at one end of the current collector.

FIG. 2 is a schematic cross-sectional view taken along the line AA ′ of FIG.
In the organic thin-film solar cell module 10 shown in FIG. 2, sunlight 1 enters from the lower side in the figure, and from the incident surface of sunlight, the surface protective layer 11, the sealing material layer 12, the organic semiconductor cell 14, and the current collector 15. The sealing material layer 12 and the back surface protective layer 13 are laminated in this order. And the exposed part 16 is provided so that the edge part of the current collection line 15 may be exposed.
The exposed portion 16 only needs to be provided so that the end of the current collector 15 can be connected to the terminal of the connection cable, and the shape thereof is not particularly limited, and examples thereof include a circular shape, an elliptical shape, a rectangular shape, and a polygonal shape. Further, the size of the exposed portion is not particularly limited as long as it is large enough to be connected to the terminal of the connection cable. The method of providing the exposed portion 16 is not particularly limited, and the back surface protective layer and the sealing material layer in the necessary region portion may be removed using a cutter or the like.

Next, electrical connection between the organic thin-film solar cell module 10 and the connection cable 17 shown in FIGS. 1 and 2 will be described.
FIG. 3 is a schematic cross-sectional view illustrating the first embodiment of the present invention. (A) is the state before the organic thin film solar cell module 10 and the terminal cover 18 are fixed, (b) shows the state where the organic thin film solar cell module 10 and the terminal cover 18 are fixed.

The connection cable 17 includes a connection cable terminal 17 b at the tip, and the connection cable terminal 17 b is protected by a terminal cover 18.
The connection cable terminal 17b has an elastic force from the top to the bottom in the figure when the bending part of the terminal is elastically deformed when stress is generated from the bottom to the top in the figure with respect to the tip of the connection cable terminal 17b. It is a structure that produces.
Therefore, by fixing the terminal cover 18 and the organic thin-film solar cell 10 with the fixing portion 19 indicated by a chain line in the figure, the connection cable terminal 17b in which the elastic force is generated presses the current collector 15 in the direction of the arrow in the figure. Then, the connection cable terminal 17b and the collecting wire 15 are electrically connected.

The connection cable terminal 17b is preferably made of a generally conductive material, and preferably has a material and thickness that are easily elastically deformed.
Moreover, the method of fixing the terminal cover 18 and the organic thin film solar cell 10 may be provided with an adhesive layer such as a double-sided tape on the fixing portion 19 or may be fixed separately using a fixing jig or the like. From the viewpoint of design and handling, it is preferable to fix the adhesive layer.
The connection cable terminal 17b can achieve electrical connection by pressing the collector line 15; however, in order to make the connection stronger, the conductive adhesive is provided between the connection cable terminal 17b and the collector line 15. A layer may be provided.
Note that only one end of the collector line 15 may be electrically connected to the connection cable terminal 17b, or both ends may be electrically connected to the connection cable terminal 17b.

  On the other hand, FIG. 4 is a schematic cross-sectional view illustrating a second embodiment of the present invention. (A) is the state before the organic thin film solar cell module 20 and the terminal cover 28 are fixed, (b) shows the state where the organic thin film solar cell module 20 and the terminal cover 28 are fixed.

The connection cable 27 includes a connection cable terminal 27 b at its tip, and the connection cable terminal 27 b is protected by a terminal cover 28.
The connection cable terminal 27b is electrically connected by contacting the current collecting wire 25 at the tip portion. The length of the portion of the terminal cable terminal 27b exposed from the terminal cover 28 is the length of the exposed portion 26. It is slightly longer than the distance between the fixing member 29 and the collector line 25. Therefore, by fixing the terminal cover 28 and the organic thin-film solar cell 20 with the fixing member 29, the connection cable terminal 27 b presses the current collection line 25 in the direction of the arrow in the figure, and the connection cable terminal 27 b and the current collection line 25. Are electrically connected.

The material of the connection cable terminal 27b is not particularly limited as long as it is a conductive material.
Further, the tip of the terminal cover 28 has a concavo-convex structure, while the fixing member 29 is also provided with a concavo-convex structure, and both are fixed by a fitting structure composed of these concavo-convex structures. In the case of the structure shown in the figure, the terminal cover 28 and the fixing member 29 are made of, for example, silicon resin.
The connection cable terminal 27b presses the current collector 25 to achieve electrical connection. However, in order to make the connection stronger, a conductive adhesive is provided between the connection cable terminal 27b and the current collector 25. A layer may be provided.

In the first and second embodiments of the present invention described above, as is clear from FIGS. 3 (b) and 4 (b), the connection cable terminal and the collector line are connected within the solar cell module. . The inside of the solar cell module means the outermost surface and the outermost layer forming the solar cell module, for example, between the surface protective layer and the back surface protective layer.
Thus, it is preferable because the collector of the solar cell module and the connection cable terminal are connected to improve the design of the solar cell module, and the positioning of the module and the terminal is simplified and the workability is improved.

FIG. 5 is a schematic top view of solar cell modules according to the third and fourth embodiments of the present invention.
As in the solar cell module shown in FIG. 1, the solar cell module 30 shown in FIG. 5 uses an organic semiconductor cell 34 in which a plurality of organic semiconductor cells are monolithically connected as a photoelectric conversion element.
Since the current collecting wire 35 is laminated while being connected to the organic semiconductor cell 34, it is covered with a sealing material layer or a surface protective layer. On the other hand, the end of the current collecting wire 35 is electrically connected to a terminal of a connection cable (not shown). Since it is necessary to take out the current collecting wire 35 from the laminated solar cell module for connection with the connection cable terminal, a current collecting wire extraction portion 36 is provided at one end of the current collecting wire.

FIG. 6 shows a schematic cross-sectional view taken along the line AA ′ of FIG.
In the organic thin-film solar cell module 30 shown in FIG. 6, sunlight 1 enters from the lower side in the figure, and from the incident surface of sunlight, the surface protective layer 31, the sealing material layer 32, the organic semiconductor cell 34, and the collector wire 35. The sealing material layer 32 and the back surface protective layer 33 are laminated in this order. And the edge part of the current collection line 35 is taken out from the solar cell module from the current collection line extraction part 36. FIG. The collecting wire 35 taken out from the solar cell module is provided with a covering portion 35b made of an insulating resin. Covering the exposed portion of the current collector outside the solar cell module with an insulating resin can reduce the damage of the current collector during construction.

  The collector line extraction part 36 should just be able to take out the collector line 35, and the shape is not specifically limited, either. Usually, it is slit-shaped, but it may be elliptical or rectangular. Further, the size of the current collector outlet 36 is not particularly limited, but in order to reduce the exposure of the organic semiconductor cell to the atmosphere as much as possible, the current collector outlet 36 is preferably smaller. The method of providing the current collector outlet 36 is not particularly limited, and a cutter or the like may be used to cut the back surface protective layer and the sealing material layer in the necessary region.

Next, electrical connection between the organic thin film solar cell module 30 and the connection cable 37 shown in FIGS. 5 and 6 will be described.
FIG. 7 is a schematic diagram for explaining a third embodiment of the present invention. (A) is the state before the organic thin film solar cell module 30 and the terminal cover 38 are fixed, (b) shows the state where the organic thin film solar cell module 30 and the terminal cover 38 are fixed.

The connection cable 37 includes a connection cable terminal 37b at the tip, and the connection cable terminal 37b is protected by a terminal cover 38.
The connection cable terminal 37b has an elastic force from the top to the bottom in the figure when the bent portion of the terminal is elastically deformed when stress is generated from the bottom to the top in the figure with respect to the tip of the connection cable terminal 37b. It is a structure that produces.
Therefore, by fixing the terminal cover 38 and the organic thin film solar cell 30 with the fixing portion 39, the connection cable terminal 37b in which the elastic force is generated presses the current collecting wire 35 in the direction of the arrow in the drawing, and the connection cable terminal 37b and the collector line 35 are electrically connected.

The connection cable terminal 37b is usually formed of a conductive material, and preferably has a material and a thickness that are easily elastically deformed.
The terminal cover 38 and the organic thin film solar cell 30 may be fixed by, for example, providing a fixing layer 39 with an adhesive layer such as a double-sided tape, or by using a fixing jig or the like. From the viewpoint of design and handling, it is preferable to fix the adhesive layer.
The connection cable terminal 37b presses the current collecting wire 35 to achieve electrical connection. However, in order to make the connection stronger, the conductive adhesive is provided between the connection cable terminal 37b and the current collecting wire 35. A layer may be provided.
Note that only one end of the current collecting wire 35 may be electrically connected to the connection cable terminal 37b, or both ends may be electrically connected to the connection cable terminal 37b.

  On the other hand, FIG. 8 is a schematic diagram for explaining a fourth embodiment of the present invention. (A) is the state before the organic thin film solar cell module 40 and the terminal cover 48 are fixed, (b) shows the state where the organic thin film solar cell module 40 and the terminal cover 48 are fixed.

The connection cable 47 includes a connection cable terminal 47 b at the tip, and the connection cable terminal 47 b is protected by a terminal cover 48.
The connecting cable terminal 47b is electrically connected by contacting the current collecting wire 45 at the tip portion thereof, but the length of the portion of the terminal cable terminal 47b exposed from the terminal cover 48 is the length of the fixed portion 49. It is slightly longer than the length of the upper part and the collector wire 45. Therefore, by fixing the terminal cover 48 and the organic thin-film solar cell 40 with the fixing member 49, the connection cable terminal 47 b presses the current collection line 45 in the direction of the arrow in the figure, and the connection cable terminal 47 b and the current collection line 45. Are electrically connected.

The material of the connection cable terminal 47b is not particularly limited as long as it is a conductive material.
Further, the tip of the terminal cover 48 has a concavo-convex structure, while the fixing member 49 is also provided with a concavo-convex structure, and both are fixed by a fitting structure composed of these concavo-convex structures. In the case of the structure shown in the figure, the terminal cover 48 and the fixing member 49 are made of, for example, silicon resin.
The connection cable terminal 47b presses the current collector 45 to achieve electrical connection. However, in order to make the connection stronger, a conductive adhesive is provided between the connection cable terminal 47b and the current collector 45. A layer may be provided.

In the third and fourth embodiments of the present invention described above, as is clear from FIGS. 7B and 8B, the connection cable terminal and the collector line are connected outside the solar cell module. . The term “outside of the solar cell module” means the outermost layer and the outermost layer forming the solar cell module, for example, the outer side of the front surface protective layer and the rear surface protective layer. In addition, when the current collector and the connection cable terminal are connected outside the solar cell module, at least a part of the current collector existing outside the solar cell module is covered with an insulating resin. This is preferable from the viewpoint of reducing breakage of the electric wire.
Thus, it is preferable because the waterproof treatment of the connection cable terminal can be simplified by connecting the collector line and the connection cable terminal outside the solar cell module.

FIG. 9 is a schematic top view of solar cell modules according to the fifth and sixth embodiments of the present invention.
As in the solar cell module shown in FIG. 1, the solar cell module 50 shown in FIG. 9 uses an organic semiconductor cell 54 in which a plurality of organic semiconductor cells are monolithically connected as a photoelectric conversion element.
Since the current collector 55 is laminated while being connected to the organic semiconductor cell 54, it is covered with a sealing material layer or a surface protective layer. On the other hand, the specific part of the collector line 55 indicated by a one-dot chain line 55c in the drawing is not laminated, and is a portion that is electrically connected to a terminal of a connection cable (not shown). Here, the present embodiment is different from the above-described embodiment in that it is connected to the terminal of the connection cable at a location that is not the end of the current collector. In this way, by providing a place that is not the end of the current collector line and that is electrically connected to the connection cable terminal, air bubbles are removed with a spatula when the solar cell module is attached in consideration of design. Even if work is performed, damage to the current collector line due to stress generated at that time can be prevented.
In addition, since it is necessary to take out the collector line 55 from the laminated solar cell module for connection with a connection cable terminal, the collector line extraction part 56 is provided in the collector line.

FIG. 10 shows a schematic cross-sectional view taken along the line AA ′ of FIG.
In the organic thin-film solar cell module 50 shown in FIG. 10, sunlight 1 enters from the lower side in the figure, and the adhesive layer 51 b, the surface protective layer 51, the sealing material layer 52, and the organic semiconductor cell 54 from the sunlight incident surface. The current collector 55, the sealing material layer 52, and the back surface protective layer 53 are laminated in this order. And a part of current collection line 55 is exposed from a solar cell module from the current collection line extraction part 56, and the current collection line end part is again sealed by the sealing structure. In addition, the collector wire 55 exposed from the solar cell module is provided with a covering portion 55b made of an insulating resin. Covering the exposed portion of the current collector outside the solar cell module with an insulating resin can reduce the damage of the current collector during construction.

  The collector line extraction part 56 should just be able to take out the collector line 55, and the shape is not specifically limited, either. Usually, it is slit-shaped, but it may be elliptical or rectangular. The size of the current collector outlet 56 is not particularly limited, but it is preferable that the current collector outlet 56 is smaller in order to reduce the exposure of the organic semiconductor cell to the atmosphere as much as possible. The method of providing the current collector outlet 56 is not particularly limited, and a cutter or the like may be used to cut the back surface protective layer and the sealing material layer in the necessary region.

Next, electrical connection between the organic thin-film solar cell module 50 and the connection cable 57 shown in FIGS. 9 and 10 will be described.
FIG. 11 is a schematic diagram for explaining the fifth embodiment of the present invention. (A) is the state before the organic thin film solar cell module 50 and the terminal cover 58 are fixed, (b) shows the state where the organic thin film solar cell module 50 and the terminal cover 58 are fixed.

The connection cable 57 includes a connection cable terminal 57 b at the tip thereof, and the connection cable terminal 57 b is protected by a terminal cover 58.
The connection cable terminal 57b has an elastic force from the top to the bottom in the figure when the bending portion of the terminal is elastically deformed when stress is generated from the bottom to the top in the figure with respect to the tip of the connection cable terminal 57b. It is a structure that produces.
Therefore, by fixing the terminal cover 58 and the organic thin-film solar cell 50 with the fixing portion 59, the connection cable terminal 57b in which the elastic force is generated presses the current collector 55 in the direction of the arrow in the figure, and the connection cable terminal 57b and the collector line 55 are electrically connected.

It is preferable that the connection cable terminal 57b is made of a generally conductive material and has a material and thickness that are easily elastically deformed.
The terminal cover 58 and the organic thin film solar cell 50 may be fixed by, for example, providing a fixing portion 59 with an adhesive layer such as a double-sided tape, or may be fixed using a fixing jig or the like. From the viewpoint of design and handling, it is preferable to fix the adhesive layer.
The connection cable terminal 57b presses the current collector 55 to achieve electrical connection. However, in order to make the connection stronger, the conductive adhesive is provided between the connection cable terminal 35b and the current collector 55. A layer may be provided.

  On the other hand, FIG. 12 is a schematic diagram for explaining a sixth embodiment of the present invention. (A) is the state before the organic thin film solar cell module 60 and the connection cable terminal 67b are connected, (b) shows the state where the organic thin film solar cell module 60 and the connection cable terminal 67b are connected.

The connection cable 67 includes a connection cable terminal 67b at the tip. Unlike the first to fifth embodiments, the connection cable 67 does not have a terminal cover.
The connection cable terminal 67b has an ridge structure at the connection portion with the current collector. The ridge structure is embedded in the current collector 65 by pressing the connection cable terminal 67b against the current collector 65, and the connection cable terminal 67b and the current collector 65 are connected to each other. It is electrically connected and its conduction is strong.

The material of the connection cable terminal 67b is not particularly limited as long as it is a conductive material. Moreover, the ridge structure of the connection cable terminal 67b should just be the structure which the front-end | tip is embedded in the current collection line by press, and can ensure conduction | electrical_connection.
The connection cable terminal 67b can achieve electrical connection by pressing the current collector 65. However, in order to make the connection stronger, a conductive adhesive is provided between the connection cable terminal 67b and the current collector 65. A layer may be provided.
Further, in order to further strengthen the connection and protect the connection portion, the connection portion may be covered with an insulating resin, or a terminal cover may be further installed.

FIG. 13 shows a seventh embodiment of the present invention, and its electrical connection will be described.
FIG. 13 is a schematic diagram for explaining a seventh embodiment of the present invention. (A) is the state before the organic thin film solar cell module 70 and the connection cable terminal 77b are electrically connected, (b) is the organic thin film solar cell module 70 and the connection cable terminal 77b electrically connected. Indicates the state.
The connection cable 77 has a terminal cover 78 at its tip, and a connection cable terminal 77b having a structure for sandwiching a current collector at the tip of the terminal cover 78. In the terminal cover 78, the upper and lower members where the connection cable terminals are present are made of a member having elasticity such as plastic.
The organic thin-film solar battery module 70 has its sealing structure removed at a portion where the organic thin-film solar battery cell is not present, and the current collecting wire 75 is exposed. The exposed portion of the current collecting wire 75 is provided with a covering portion 75b made of an insulating resin.
With the terminal cover 78 opened up and down, the connection cable terminal 77b is moved to the exposed current collecting portion and returned to the original state, so that the connection cable terminal 77b presses the current collection wire and collects with the connection terminal cable 77b. The electric wire 75 is electrically connected.
In addition, it is preferable from a durable viewpoint to make it the structure which can seal the exposed part of a collector wire with a terminal cover.
Moreover, since the connection cable terminal of the 6th embodiment of this invention and the 7th embodiment can penetrate a surface protective layer and a sealing layer, it seals in the location where an organic thin film photovoltaic cell does not exist. Without removing the structure, the connection cable terminal and the current collecting line can be electrically connected. That is, the connection cable terminal and the collector line can be connected inside the sealing structure of the solar cell module. When connecting inside a sealed structure, increase the thickness of the current collector at the connection location so that the contact area between the connection cable terminal and the current collector increases, or use a conductive material such as metal for the current collector. Is preferably installed.
And since the connection cable terminal of the 6th embodiment of this invention and the 7th embodiment has the structure where the one part penetrates and connects a current collection line, reliable conduction with a current collection line and a connection cable terminal It is also preferable in that it can be easily obtained and can be stably conducted for a long time.

FIG. 14 shows a solar cell module 80 which is an application example of the present invention.
FIG. 14 is a schematic top view of the organic thin film solar cell module 80. In the present embodiment, the current collector 85 is disposed at the upper end and the lower end of the organic semiconductor cell 84, and the current collector 85 disposed at the upper and lower ends of the organic semiconductor cell 84 meets at the right portion of the organic semiconductor cell 84. To do.
By providing a current collector exposed portion (not shown) at the meeting portion of the two current collectors, it is possible to connect the current collector and the connection cable terminal at a time, which is efficient. The assembled current collecting wire and the connection cable terminal may be connected individually, or two wires may be connected simultaneously by fixing the two connection cable terminals according to the position of the assembled current collecting wire.

  According to the solar cell module of the present invention, even after the solar cell module is installed on the object to be installed, the current collecting line and the connection cable in the module can be easily connected. Moreover, according to the solar cell module of this invention, it is not necessary to use solder for the connection between the current collector and the connection cable, and a solder-free solar cell module is obtained. In addition, according to one aspect of the solar cell module of the present invention, even when an operation for removing bubbles with a spatula is performed in adhering the solar cell module in consideration of design, a current collecting line due to stress generated at that time Can prevent damage.

1 Sunlight 10, 20, 30, 40, 50, 60, 70, 80 Organic thin film solar cell modules 11, 21, 31, 41, 51, 61, 71 Surface protective layers 51b, 61b Adhesive layers 12, 22, 32, 42, 52, 62, 72 Sealing material layers 13, 23, 33, 43, 53, 63, 73 Back surface protective layers 14, 24, 34, 44, 54, 64, 74, 84 Organic semiconductor cells 15, 25, 35 , 45, 55, 65, 75, 85 Current collecting wire 35b, 45b, 55b, 65b, 75b Resin-coated current collecting wire 16, 26 Exposed portion 36 Current collecting portion 17, 27, 37, 47, 57, 67, 77 Connection cable 17b, 27b, 37b, 47b, 57b, 67b, 77b Connection cable terminals 18, 28, 38, 48, 58, 78 Terminal covers 19, 39, 59 Fixing parts 29, 49 Fixing members

Claims (10)

A solar cell module comprising at least a photoelectric conversion element and a current collecting line for taking out the electricity converted by the photoelectric conversion element, wherein the current collection line is electrically connected to a connection cable terminal,
A solar cell module in which the connection cable terminal and the collector line are electrically connected by pressing the connection cable terminal against the collector line. The connection cable terminal has a terminal cover fixed to the solar cell module;
The solar cell module according to claim 1, wherein the connection cable terminal and the collector line are electrically connected by fixing the terminal cover and the solar cell module.   The solar cell module according to claim 1 or 2, wherein the connection cable terminal and the collector line are connected inside a sealing structure of the solar cell module. The connection cable terminal and the collector line are connected outside the sealing structure of the solar cell module,
The solar cell module according to claim 1 or 2, wherein at least a part of the portion of the collector line existing outside the solar cell module is covered with an insulating resin.   The solar cell module according to claim 3 or 4, wherein the terminal cover and the solar cell module are fixed by an adhesive layer.   The solar cell module according to claim 3 or 4, wherein the terminal cover and the solar cell module are fixed by a fitting structure.   The solar cell module according to claim 1, which is a thin film solar cell module.   The solar cell module of any one of Claims 1-7 which has flexibility. A method of connecting a collector line and a connection cable terminal of a solar cell module,
A step of preparing a photoelectric conversion element and a solar cell module including at least a current collecting line for taking out electricity converted by the photoelectric conversion element, and a connection cable terminal capable of being electrically connected to the current collecting line of the solar cell module; and Pressing the connection cable terminal against the current collector and electrically connecting the connection cable and the current collector;
And including methods.   The method according to claim 9, wherein the solar cell module is a thin film solar cell module having flexibility.