JPH11166304A - Roof material with solar battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof material with solar battery in which a ground cable is made an electrode cable for taking out power that a solar battery cell generates and a cable (or a wire) in the roof material with solar battery in a sunlight generating system installed on a roof. SOLUTION: A solar battery cell 10a generating power by being installed on a roof in a sunlight generating system is integrated. In this case, this roof material 1 is provided with an electrode cable 11 for taking out generated power and a ground cable 12 for grounding leakage current generated in the roof material 1 and charged electric charge. The electrode cable 11 and the ground cable 12 are formed as a cable 13 covered with a common film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roofing material with a solar cell in a solar power generation system installed on a roof or the like, in which both an electrode cable and an earth cable for extracting electric power generated by the solar cell are provided. The present invention relates to a roofing material with a solar cell which is a cable (or one wire).

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6A, a plurality of solar cells b are bonded to a steel plate c as a standard roofing material a with solar cells in a photovoltaic power generation system. Is provided with an electrode cable d and a connector (or jack) e for taking out the electric energy generated by the roofing material a with the solar cell and a ground cable g for taking a ground from the ground terminal f. Have been.

As shown in FIG. 6 (B), the standard structure of the roofing material a with solar cells is that the surface is covered with a protective layer such as a fluororesin film and the like. An anti-reflection film for facilitating the operation, a solar cell b having a multi-layered structure made of PN junction type silicon or amorphous silicon, an adhesive layer for attaching the solar cell b to a base made of a steel sheet c, and the steel sheet c ( A coating film for taking insulation when bonding with the base material), the steel plate c (base material),
Further, it is composed of a coating film for protecting the steel sheet c (base) from the outside and for insulating it.

The roofing material a with solar cells is usually arranged so that the polarity of each solar cell b is alternately plus and minus, and the generated current (+) is applied to the plus and minus poles at both ends. Or, an electrode cable d for extracting the voltage) is connected. The electrode cable d is
Normally, the cells b, b, b,... Are connected to a power collection box (or a connection box) for collecting power generated by the solar cells b, b, b. Such a conventional photovoltaic power generation system is generally a series of systems including the power collection box and the like, and a roof material a with a solar cell in the photovoltaic power generation system is a roof material such as a steel plate c. The structure is integrated with the material and fixed to the gantry mounted on the roof, making it possible to utilize the entire roof.

[0005] Against the background of the recent global environmental protection movement,
Under the leadership of the Agency for Natural Resources and Energy of the Ministry of International Trade and Industry, with the use of the half-subsidy subsidy monitor system for private homes launched in 1994,
Solar power systems have begun to spread to ordinary homes, and manufacturers have set up mass production systems.

[0006]

However, at the time of the conventional roofing work with a solar cell, after installation on a roof (or a rooftop), the roofing material with the solar cell generates power and the worker does not receive an electric shock. Cover the solar cells with a sheet
Wiring work related to electrode cables and grounding cables for roof materials with solar cells must be performed after taking measures to prevent power generation during construction. It has been pointed out that the problem has been hindering the further spread of power generation systems, and both consumers and suppliers have demanded an immediate solution to this problem.

On the other hand, after the construction, the ground cable and the like drawn from the conventional roof material with solar cells are drawn separately from the electrode cables. Often connected to the power collection box (or junction box) from the roof of the outside
The roof design may be impaired, extra expenditure may be required for the aesthetic work, or the ground cable may be exposed to outside air and oxidized, resulting in poor grounding and hindering the original functioning of the ground. There was a problem, and it was hoped that the problem, mainly by the owner, would be resolved as soon as possible.

[0008]

Means for Solving the Problems The inventor has made extensive studies and as a result, has found that the present invention has been applied to a roof material in which a solar cell for generating electricity by being installed on a roof or the like in a solar power generation system is integrated. And a ground cable for grounding a leakage current or a charge of the charge generated in the roof material. The electrode cable and the ground cable are covered with a common coating.
By using a roofing material with a solar cell characterized by being formed as a book cable, the complexity of wiring work is remarkably reduced, the efficiency of grounding is increased, and the risk of electric shocks to workers is eliminated. This has solved the problem. Hereinafter, the present invention will be described in detail with reference to the drawings.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, in this specification, the term "cable" refers to an insulated conductor having a coating on a conductor, or a combination of the conductors having a common coating on a conductor. It means what was given. The term “wire” refers to a bare wire or an insulated wire or an aggregate thereof and having no common outer coating. "Outer coating" means the outermost coating,
In this specification, it may be used synonymously with “film”.

FIG. 1A shows a roofing material with a solar cell according to the present invention. In the roofing material with solar cells, a solar cell composed of a plurality of solar cells 10a connected in series alternately in plus and minus is bonded to the roofing material 1 to be integrally formed. The roof material 1 has a coating film 1b formed on the front and back surfaces of a steel plate 1a, and integrates solar cells 10a in a solar power generation system to form a roof installed on a roof or a roof of a building. It refers to a member to be formed, and its length, width, thickness, and the like may be arbitrary. The solar cell is synonymous with the solar cell 10a.

FIG. 1B shows a sectional structure of the roofing material with solar cells. The roofing material 1 is, as described above,
A steel sheet 1a whose front and back surfaces are covered with a coating film 1b;
And an adhesive layer 1c for adhering Oa. The solar cell 10a is attached to the roof material 1 via the adhesive layer 1c. Further, an antireflection film 10b and a protective layer 10c may be formed thereon.

Cables 13 are drawn out from the electrodes at both ends of the roofing material with solar cells. The cables 13 include one or more electrode cables 11 for extracting the electric power generated by the solar cell 10a. ing. Further, the electrode cable 11 pulled out from either the plus side or the minus side or both sides of the roofing material with solar cells also includes an earth cable 12 for grounding the steel plate 1a. In the case of FIG. 1, the cable 13 pulled out from the minus side of the roof material with solar cells includes the electrode cable 11 and the ground cable 12. In addition, on the contrary, the cable 13 drawn from the plus side of the roof material with solar cells may include the electrode cable 11 and the earth cable 12, or the roof with solar cells may be used. The cable 13 pulled out from the plus side and the minus side of the material is the electrode cable 11 and the ground cable 1 respectively.
2 may be included.

An electrode cable connector (or jack) 11a is fixed to one end of the electrode cable 11, and an earth cable connector 12a is fixed to one end of the earth cable 12 by soldering or crimping. The other ends of the two cables, that is, the ends to which the connector is not fixed, are connected to the negative electrode and the positive electrode of the solar cell 10a by a process such as soldering, welding, pressure bonding, or an adhesive. At this time, a box-shaped cover for covering a portion connected to the negative electrode or the positive electrode, which is a junction box 14, may be attached. By protecting the connection from wind and rain, rust, dust and corrosion resistance can be expected to be enhanced.

The electrode cable 11 and the earth cable 12 are each made of one or more core wires covered with a film which has been subjected to a polyethylene insulation treatment or the like, and an outer wire which further covers the core wire covered with the film. Consisting of a film,
Cables generally used for photovoltaic power systems can be used. As the material of the core wire, any material may be used as long as it is a conductor. For example, copper, copper alloy, aluminum, aluminum alloy, steel, and the like can be used, but are not limited thereto. However, in order to reduce the influence of heat generation on the roof material with solar cells and the ignitability, a material such as copper having an electric resistance value as low as possible is preferably used. Further, the material of the film and the outer film may be any material as long as it can completely insulate and protect the core wire from the outside world, for example, soft or semi-hard polyvinyl chloride, fluororesin, and tetrafluoroethylene. Copolymers with hexafluoroethylene and the like correspond to, but are not limited to, these. Further, the withstand voltage of the electrode cable 11 and the earth cable 12 is preferably at least 600 V from the experience of the industry, but may be lower than that according to the generated voltage of the roofing material with solar cells. I do.

The electrode cable connector (or jack) 11a and the ground cable connector 12a
Are the electrode cable 11 and the earth cable 12
Is connected to a power collection box (or a junction box) or the like which is usually provided in the next stage, and the shape can be the one used for general roofing materials with solar cells.
For example, the shape may be convex or concave, and may be any shape such as an RCA plug, an alligator clip, a coaxial cable connector, a fitting plug, a crimp terminal, a BNC connector, and the like, and may take any shape. . Further, it is desirable that the structure is sufficiently insulated so that the current flowing through the core wires of the electrode cable 11 and the earth cable 12 does not leak outside.

Such a roofing material with solar cells according to the present invention is constructed so that a plurality of the roofing materials are arranged vertically and horizontally on a roof or a roof of a building. At this time, for each of the roofing materials with solar cells, the electrode cable 11 is connected via the electrode cable connector (or jack) 11a such that the electrodes are connected in series (alternately plus or minus), and The ground cable 12 is also gradually connected through the ground cable connector 12a, so that it finally has a form as shown in FIG.

FIG. 5 shows a state in which a plurality of roofing materials with solar cells according to the present invention which are electrically connected in series are formed in two blocks, that is, a block A and a block B. For example, the electrode cable 11 or the earth cable 12 or both of them are drawn out from the electrodes at both ends of the block A, that is, the positive pole (+) and the negative pole (-) at both ends, and each of them collects electricity. It is connected to a suitable input terminal 53 or earth terminal 54 of the box (or junction box). When the electrodes in the middle except for the electrodes at both ends of the block A are connected in series, the electrode cables 11 may be gradually connected via the electrode cable connector 11a, and the ground cable may be gradually connected. In this case, the connection may be made via the ground cable connector 12a. In addition, the ground cable 12 drawn from one or both ends of the block A can be separately installed directly on the ground without being connected to the ground terminal 54 of the power collection box.

FIG. 4 shows one form of connection between the electrode cable 11 and the earth cable 12 on the back surface of the roofing material with solar cells according to the present invention. An electrode hole A for connecting the electrode cable 11 and extracting electric power generated by the solar cell 10a is provided on the back surface of the roofing material with solar cells.
Is provided. The electrode hole A is formed by perforating the solar battery cell 10a through the coating film 1b, the steel plate 1a, and the like. The core layer of the electrode cable 11 is formed on an electrode layer generally formed in the solar battery cell 10a. Are securely connected by soldering, pressing, bonding with an adhesive or the like.
After the electrode cable 11 is connected, the electrode hole A may be filled with a putty, an adhesive, or the like so as not to be oxidized by contact with the outside air.

A ground hole B for connecting the ground cable 12 to the steel plate 1a is similarly provided adjacent to the ground hole. The ground hole B is for connecting the ground cable 12 to a steel plate 1a which appears after peeling off a minute area of the coating film 1b on the upper surface of the back surface of the roofing material with solar cells. This is because, when any leakage current or electrification occurs in the steel plate 1a, those electric charges are grounded via the ground cable 12 and released. After the earth cable 12 is connected, the earth hole B may be filled with a putty or the like so as not to be oxidized by contact with the outside air.

Next, a first embodiment of a roofing material with a solar cell according to the present invention will be described with reference to FIGS. The basic configuration is the same as that shown in FIG. 1, and the roofing material with solar cells includes an electrode cable 11 and an electrode cable connector 1.
1a, ground cable 12 and ground cable connector 12a, electrode cable 11 and ground cable 1
2 is covered with the same film. The junction box 14 is provided mainly for protecting the electrode hole 10c or the earth hole 10d from the outside air and the wind and rain, and can be used in the present invention, but need not be used. .

FIG. 2A is a side sectional view of the cable 13, the electrode cable 11, the electrode cable connector 11a, the ground cable 12, and the ground cable connector 12a, and FIG. FIG. The cable 13 drawn from the electrode of the roofing material with solar cells includes the electrode cable 11 and the earth cable 12 with the same coating. That is, it has a two-core cable structure. FIG. 2C is a side sectional view of the electrode cable connector 11a or the ground cable connector 12a, and FIG.
It is the front sectional view. The electrode cable connector 11
a or the ground cable connector 12a,
It takes the shape of a convex (male) connector having pins 11b (or 12b), in which case the mating connector to be connected takes the shape of a concave (female) connector.

Further, the electrode cable 1 included in the cable 13 drawn from the electrode at the other end of the roof material with solar cells is included.
Contrary to the above, the connector 1 and the ground cable 12 take the shape of a concave (female) connector, and in this case, the mating connector to be connected takes the shape of a convex (male) connector. . Consideration is given to the case where a plurality of roof materials with solar cells according to the present invention are electrically connected in series or in parallel.

Next, a second embodiment will be described with reference to FIGS. The basic configuration is as shown in FIG.
And the electrode cable 11 as shown in FIG.
In place of the electrode wire 21 and the earth cable 12
Instead of using a ground wire 22. However, in order to achieve the object of the present invention, the electrode wire 2
It is assumed that 1 and the ground wire 22 are bonded at the boundary where the outer coatings of the two contact each other. The term "adhesion" as used herein includes both bonding to each other with an adhesive or the like and integrally forming a part of the outer coating in a general process of manufacturing the outer coating. Electrode wire 21 and earth wire 2 bonded to each other
In order to be able to be torn by hand as needed, the two are bonded by a weak tacky adhesive,
It is ideal that the thickness of the middle part is reduced as shown in FIG.

The electrode wire 21 and the ground wire 2
2 can be substantially the same as the electrode cable 11 and the earth cable 22 in the first embodiment, so that the electrode cable connector 11a and the earth cable connector 12a can be used as they are, but the first embodiment As another form of the connector of the form shown in FIG.
A concave connector (female connector) as shown in (D) can also be used. In this case, the other end of the connection needs to be in the shape of a convex connector (male connector).

Further, also in the first and second embodiments, the connectors such as the electrode cable connector 11a and the ground cable connector 12a are connected to the electrode cable 1a.
1 and the ground cable 12 may be housed together.
In this case, the contacts inside the connector are completely insulated so that the electrode cable 11 and the ground cable 12 are not electrically conducted. Specifically, similarly to the structure of a stereo plug used for audio, when the shape of the connector is a convex type (male type), as shown in FIG. And a conductor portion for the ground cable 12. In this case, the shape of the connector on the other end is concave (female), so that the insulating band 1
The structure is such that contact is made at the boundary of 1c.

[0026]

According to the first aspect of the present invention, there is provided a photovoltaic cell 10 which is installed on a roof or the like in a photovoltaic power generation system to generate power.
a. The roofing material 1 in which a is integrated with an electrode cable 11 for taking out generated electric power, and an earth cable 12 for grounding a leakage current or a charged charge generated in the roofing material 1. The electrode cable 11 and the earth cable 12 are one cable 1 covered with a common film.
3, the electrode cable 11 and the earth cable 12 are combined into a single cable 13, so that there is no need to separately wire them. In addition to the effect of significantly reducing the complexity of wiring work that was recognized when installing roofing materials with solar cells, the advantage that it can contribute to the spread of photovoltaic power generation systems because wiring work is simplified. Have.

In addition, electric shock accidents due to unforeseen leakage or electrification that may occur due to aging or friction with air can be prevented by integrating the ground cable 12 with the electrode cable 11. As a result of being able to prevent careless contact with another conductor, there is also an advantage that such an electric shock accident can be prevented beforehand.

Further, the earth cable 12 conventionally connected to the power collection box or the like along the outside of the roof is replaced with the electrode cable 11.
As a result, the ground cable 12 can be laid together in a cable groove, a common groove, and the like through which the electrode cable 11 normally passes, so that the aesthetics and design of a building or a roof are not impaired. Play. Also,
There is also no need to pay for construction costs related to aesthetic treatment, and there is an advantage that construction can be performed at a lower cost than before.

Next, according to a second aspect of the present invention, in the first aspect, an electrode cable connector 11a is connected to one end of the electrode cable 11, and an earth cable connector 12a is connected to one end of the earth cable 12. The electrode cable 11 and the grounding cable 12 are covered with a common coating, and the electrode cable connector 11a and the With the ground cable connector 12a, it is possible to further reduce the contact of the electrode cable 11 and the like with the outside air, particularly at the connection points in the power collection box and the like. This has the effect of further preventing accidents caused by.

[Brief description of the drawings]

FIG. 1A is an external view of a roofing material with a solar cell according to the present invention, and FIG.

2A is a side cross-sectional view of the cable. FIG. 2B is a cross-sectional view of the cable according to FIG. 2A taken along the line PP. FIG. 2C is a side view of the electrode cable connector or the ground cable connector. Is a cross-sectional view of the connector for the electrode cable or the connector for the earth cable, taken along the line RR.

3A is a side view of an electrode wire and an earth wire. FIG. 3B is a perspective view of the electrode wire and the earth wire. FIG. One side of the cable connector or the ground cable connector is a side view showing only the main part. (E) is a cross-sectional view of the electrode cable connector or the ground cable connector taken along the arrow TT.

FIG. 4 is a diagram showing a connection mode of electrode cables and the like on the back surface of the roof material with solar cells.

FIG. 5 is an external view showing an example of the orientation of electrodes when the roof material with solar cells of the present invention is installed on a roof or the like.

6A is an external view of a conventional roofing material with solar cells, and FIG. 6B is a cross-sectional configuration diagram of a conventional roofing material with solar cells.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Roofing material 10a ... Solar cell 11 ... Electrode cable 11a ... Electrode cable connector 12 ... Earth cable 12a ... Earth cable connector 13 ... Cable

Claims (2)

[Claims] An electrode cable for extracting generated power, a leakage current generated in the roof material, and an electrode cable for integrating a solar cell installed on a roof or the like in a photovoltaic power generation system to generate power. A roofing material with a solar cell, comprising: a grounding cable for grounding the charged electric charge, wherein the electrode cable and the grounding cable are formed as a single cable covered with a common film. 2. The roofing material with a solar cell according to claim 1, wherein an electrode cable connector is connected to one end of the electrode cable, and an earth cable connector is connected to one end of the earth cable. .