JP2563877Y2 - Solar cell module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solar cell module, and more particularly, to a structure of an electromotive force extracting portion in the solar cell module.

[Conventional technology and issues to be solved]

As shown in FIG. 3, a plurality of photovoltaic elements 1 are arranged in series and / or in parallel according to an output voltage and an output current, and a glass substrate 2 is provided on the light receiving side of the photovoltaic element 1.
And a super-straight structure in which a weather-resistant film 3 is disposed on the back side and a photovoltaic element 1 between the glass substrate 2 and the weather-resistant film 3 is sealed with an adhesive resin 4. A solar cell module is provided. Since this solar cell module has high weather resistance and mechanical strength, it has been partially put to practical use mainly as a means for outdoor power supply.

In this solar cell module, the plurality of photovoltaic elements 1 are connected in series / parallel with a metal foil, a conductive paste, or the like, and the glass substrate 2 is generally made of tempered glass having high mechanical strength. . On the other hand, in order to protect the photovoltaic element 1 from moisture and to secure insulation with the back electrode of the photovoltaic element 1, a metal foil 5 such as aluminum is used as the weather-resistant film 3.
A film having a three-layer structure sandwiched between insulating films 6 such as a PET film is generally used. Further, as the adhesive resin 4 filled between the glass substrate 2 and the weather-resistant film 3 and enclosing the photovoltaic element 1, PVB (polyvinyl butyrate), EVA (ethylene vinyl acetate), silicone, or the like is used. Have been.

In the solar cell module having such a configuration, the electromotive force generated by the photovoltaic element 1 is integrated at a predetermined extraction electrode portion formed by cutting the weather-resistant film 3 on the back surface of the solar cell module, and is applied to the extraction electrode portion. It is taken out through a soldered metal foil lead 7. However, since the weather-resistant film 3 has a three-layer structure in which the metal foil 5 is sandwiched, the insulating property between the metal foil 5 and the metal foil lead 7 tends to be unstable, and an increase in leak current and short-circuiting occur. Was causing it.

Therefore, various proposals have conventionally been made to ensure insulation between the metal foil 5 of the weather-resistant film 3 and the metal foil leads 7. For example, as shown in FIG. 4, when the adhesive resin 4 is filled and laminated as shown in FIG. 4, the adhesive resin 4 is taken out and protruded into the electrode portion to be insulated by the resin 8. It is. However,
Since the metal foil lead 7 is not fixed, when the adhesive resin 4 protrudes, the metal foil lead 7 is pushed to one of the cut surfaces of the weather-resistant film 3 and comes into contact with the metal foil 5 sandwiched therebetween. was there.

For this reason, as shown in FIG. 5, a technique has been proposed in which the insulating thin plate 9 is interposed between the weather-resistant film 3 and the metal foil lead 7. However, the insulating thin plate 9 itself may be displaced, and there is no reliability in securing insulation.

Therefore, the present inventor has conducted intensive research with the aim of providing a solar cell module free of electromotive force leakage and short circuit by improving the structure of a portion for extracting the electromotive force generated by the photovoltaic element. As a result, the present invention was reached.

[Means for solving the problem]

The gist of the solar cell module according to the present invention is that a transparent substrate is arranged on the light receiving side of the photovoltaic element, and a three-layer structure in which insulating films are sandwiched on both sides of a metal foil on the back side of the photovoltaic element. A solar cell module in which a weather-resistant film having a structure is arranged, a resin is filled between the transparent substrate and the weather-resistant film, and a photovoltaic element is sealed, and the weather-resistant film of the solar cell module is provided. A non-melting insulating film is provided so as to cover at least one surface of the cut surface of the weather-resistant film in the electromotive force take-out opening formed in a part of the non-melting insulating film; A metal foil lead for taking out an electromotive force is provided so as to be in contact with the conductive film, and is sealed with the resin.

[Action]

According to the solar cell module of the present invention, at least any section of the weatherproof film at the electromotive force extraction opening through which the metal foil lead for extracting electromotive force from the photovoltaic element is covered is covered with the non-melting insulating film. The metal foil lead is provided so as to be in contact with the surface of the insulating film and is taken out. At least one portion of the cut end surface at the electromotive force extraction opening where the metal foil of the weather-resistant film having a three-layer structure is exposed is covered with a non-melting insulating film and insulated, and the insulated portion is provided. Since the metal foil lead is passed close to the metal foil lead, the metal foil lead is moved by the resin melted during lamination with the resin, so that the metal foil is exposed. There is no contact with other cut surfaces, and insulation is ensured.

〔Example〕

Next, embodiments of the solar cell module according to the present invention will be described in detail.

FIG. 2 is a cross-sectional view showing a main part of the solar cell module according to the present invention. In the solar cell module, a plurality of photovoltaic elements 10 are connected in series so as to obtain a predetermined output voltage, and a predetermined output voltage is obtained. A device configured to be connected in parallel so as to obtain a current. These photovoltaic elements 10 are connected by a metal foil 12, and the generated electromotive force is integrated on a pair of positive and negative extraction electrodes 14. Here, the photovoltaic element 10 used in the present invention may be a crystalline photovoltaic element or the like in addition to an amorphous silicon-based photovoltaic element or the like, and is not limited in any way.

A plurality of photovoltaic elements 10 connected in series or in parallel
A transparent substrate 16 is disposed on the light receiving side of the substrate. Transparent substrate 16
Is made of tempered glass or transparent plastic, and transmits light to the photovoltaic element 10 and
Is configured to protect the Meanwhile, the photovoltaic element
On the back side of 10, a weather-resistant film 18 is arranged. As shown in FIG. 1 in an enlarged manner, both sides of a metal foil 20 such as aluminum A1 are made of a fluorine-based film or a weather-resistant film.
This is a three-layer film sandwiched between insulating films 22 such as a PET film. The metal foil 20 is for preventing moisture from entering the solar cell module, and the insulating film 22 is for the back electrode of the photovoltaic element 10 and the metal foil 12 for connection and the metal foil 12 for moisture prevention. This is to prevent short circuit due to contact with 20.

An adhesive resin 24 such as PVB or EVA is filled between the transparent substrate 16 and the weather-resistant film 18 which are arranged with the plurality of connected photovoltaic elements 10 interposed therebetween by means such as a vacuum laminating method. The electromotive element 10 is fixedly enclosed. The photovoltaic element 10 is integrated with the transparent substrate 16 and the weather-resistant film 18 by the adhesive resin 24, thereby preventing moisture from entering and reinforcing the strength of the solar cell module.

The electromotive force generated by the photovoltaic element 10 in the solar cell module is integrated on a pair of positive and negative extraction electrodes 14 and is externally connected to the external electrode of the solar cell module via a metal foil lead 26 connected to the extraction electrode 14. Is taken out. An electromotive force extraction opening 28 formed by cutting the weather resistant film 18 is provided at a position where the metal foil lead 26 is passed.
At least one of the cut surfaces of the weather-resistant film 18 at the electromotive force take-out opening 28 is provided with a non-melting insulating film so as to cover the cut surface as shown in FIG.
30 is provided to insulate the metal foil 20 in the weather resistant film 18. As the non-melting insulating film 30, a fluorine-based film, PET film, polyimide film, or the like is used, and any material that covers the cut surface of the weather-resistant film 18 and insulates the metal foil 20 therein is sufficient. .

A metal foil lead 26 for taking out an electromotive force is disposed at a position in the opening 28 where the electromotive force is taken out and close to a location insulated by the insulating film 30. After the placement of the insulating film 30 and the placement of the metal foil leads 26 on the cut surface of the weatherproof film 18 in the electromotive force extraction opening 28,
The aforementioned adhesive resin 24 is filled and the photovoltaic element 10 is sealed. At this time, when the adhesive resin 24 protrudes from the electromotive force extraction opening 28, the metal foil lead 26 may be moved by the flow of the adhesive resin 24. However, in the present invention, the electromotive force extraction opening 28 in which the metal foil lead 26 is provided is insulated by the non-melting insulating film 30, and the metal foil lead 26 and the metal in the weatherproof film 18 are insulated. Foil
There is no leakage current or short circuit between them. Therefore, the electromotive force generated by the photovoltaic element 10 is efficiently derived, and it is possible to produce a solar cell module having desired performance with good yield.

Here, the electromotive force led out of the solar cell module by the metal foil lead 26 is supplied to the load by the external cable 32 connected to the metal foil lead 26. The joint between the metal foil lead 26 and the external cable 32 is housed in the terminal foil 34 and silicone is sealed in the terminal box 34 to protect the joint and to protect the joint from the solar cell module. Moisture is prevented from entering the interior of the device.

Although the embodiment of the present invention has been described in detail, the present invention can be implemented in other forms.

For example, the metal foil lead 26 is attached to the surface of the non-melting insulating film 30 in advance, and after the insulating film 30 is provided, one end of the metal foil lead 26 is connected to the extraction electrode of the photovoltaic element 10. You may make it connect to the part 14.

In addition, the insulating film to be sandwiched on both sides of the metal foil constituting the weather-resistant film is formed in a film shape in advance, and when the film is adhered to the metal foil, the insulating film is insulated on the surface of the metal foil. It may be a thin film formed by applying a conductive resin material by coating or the like.

Further, the terminal box 34 and the silicone encapsulated therein are not necessarily required, and the present invention may be subjected to various improvements, corrections, and modifications based on the knowledge of those skilled in the art without departing from the gist of the present invention. This can be implemented in an added form.

[Effect of the invention]

In the solar cell module of the present invention, at least one cut surface of an electromotive force extraction opening formed by cutting off a part of a weather-resistant film in which an insulating film is sandwiched on both surfaces of a metal foil is not melted. The metal foil lead that takes out the electromotive force is placed so as to cover the part covered with the insulating film and to contact the part covered by the insulating film, so that the metal foil of the weather-resistant film and the metal foil lead come into contact with each other. Never. Therefore, the electromotive force generated by the photovoltaic element does not leak to the metal foil of the weather-resistant film as a leak current, or the electromotive force is not lost due to the short circuit. Is derived efficiently. Also,
Since defects such as leak current do not occur, productivity and yield can be improved when assembling the solar cell module.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a main part of the embodiment of the solar cell module according to the present invention, and FIG.
FIG. 2 is a cross-sectional view of a main part showing the entire main part of the embodiment shown in FIG. FIGS. 3, 4 and 5 are cross-sectional views of a main part showing an electromotive force extraction opening of a conventional solar cell module. 10; Photovoltaic element 12; Metal foil 16; Transparent substrate 18; Weatherproof film 20; Metal foil 22; Insulating film 24; Adhesive resin 26; Metal foil lead 28; Electromotive output opening 30; Non-melting Insulating film

Claims (1)

(57) [Scope of request for utility model registration] A transparent substrate is arranged on the light receiving side of a photovoltaic element, and a weather-resistant film having a three-layer structure in which insulating films are sandwiched on both sides of a metal foil on the back side of the photovoltaic element. Arranged, a solar cell module in which a photovoltaic element is sealed by filling a resin between the transparent substrate and the weather-resistant film, and formed on a part of the weather-resistant film of the solar cell module. A non-fusible insulating film is provided so as to cover at least one surface of the cut surface of the weather-resistant film at the electromotive force extraction opening, and is in contact with the provided non-fusible insulating film. A solar cell module, wherein a metal foil lead for taking out an electromotive force is provided and sealed with the resin.