JP2002151725A - Solar cell module and its installing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module which is improved in yield by preventing a metal plate from separating from a solar cell, and to provide a method of installing the same. SOLUTION: A part (only a flat plate 2a except a horizontal part 2e) thinner than the other part (a two-layered structure composed of a flat plate 2a and a horizontal part 2e of a second bent part 2c) is provided to a metal plate 2 where a solar cell 1 is bonded with an adhesive agent 3, and a solar cell module 10 is supported and fixed on building materials (a roofing board 5) by screwing down the above thin part by the use of fixing machine screws 6 through the intermediary of backing material. The displacement of the solar cell module 10 caused by screwing the machine screws is absorbed by parts around the fixed spots and hardly reaches the bonding region, so that the solar cell 1 is never separated from the metal plate 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module to be installed in a dwelling, and a method for installing a solar cell module in which a solar cell module is directly installed on a building material without using a frame.

[0002]

2. Description of the Related Art Photovoltaic power generation, which converts light energy into electric energy by utilizing the photoelectric conversion effect, is widely used as a means for obtaining clean energy. And with the improvement of the photoelectric conversion efficiency of solar cells, many private homes,
Photovoltaic power generation systems are being provided.

[0003] In a photovoltaic power generation system for a private house, in addition to a method of installing a plurality of solar cell modules on a metal base, a plurality of solar cell modules can be directly connected to a roof building material (field board) without providing a base. There is also a method of setting it up. In the method of installing multiple solar cell modules directly on the base plate, in order to make the appearance similar to that of the roof, stairs are moved from the ridge side to the eaves side with the ends of adjacent solar cell modules stacked together. In many cases, a so-called stepping structure in which a plurality of solar cell modules are installed in a shape is adopted. At this time, the eaves side is fixed by fitting with the adjacent solar cell module, and the ridge side is fixed by screwing to the base plate.

FIG. 7 is a perspective view showing the appearance of such a conventional solar cell module 10, and FIG. 8 is an enlarged partial cross-sectional view showing the installation state of the solar cell module 10 on the ridge side (above the water). is there. As shown in FIG. 7, the solar cell module 10 is configured by bonding a solar cell 1 having a photoelectric conversion material such as crystalline silicon or amorphous silicon to a metal plate 2 made of, for example, a steel plate with an adhesive 3. I have. The metal plate 2 includes a flat plate portion 2a to which the solar cell 1 is adhered to a partial area thereof, and a first bent portion 2b and a second bent portion 2b which are respectively bent toward the eaves side (underwater side) and the ridge side.
And a bent portion 2c. The first bent portion 2b on the eave side is configured to be bent substantially vertically downward and then further bent upward by a predetermined angle, and functions as an eave side engaging portion that engages with the solar cell module 10 on the eave side. The ridge-side second bent portion 2c includes a rising portion 2d doubly bent substantially vertically upward, a horizontal portion 2e connected to the rising portion 2d and extending toward the solar cell 1, and a horizontal portion 2e. And a ridge-side engaging portion 2f which is bent substantially vertically upward and further bent downward by a predetermined angle.
Then, the ridge-side engaging portion 2 of the solar cell module 10 on the eaves side
f, the first bent portion 2 of the solar cell module 10 on the ridge side
The plurality of solar cell modules 10 can be installed in a stepwise manner in a mode in which the solar cell modules b are engaged.

Here, each solar cell module 10 is fixed on the eaves side by engagement with the adjacent solar cell module 10 located further on the eaves side (the first bent portion 2b and the ridge side engagement portion 2).
f). On the other hand, on the building side of each solar cell module 10, as shown in FIG.
The solar cell module 10 is fixed to the backing material 4 by using fixing screws 6 in the portion where the steel plate of the
And is supported and fixed to the base plate 5 via the. It is common to use styrene foam having a heat insulating function for the backing material 4.

[0006]

In the conventional solar cell module 10, when the fixing to the base plate 5 is performed by the fixing screws 6, the backing material 4 is easily deformed, and the fixing portion is made of a steel plate. Due to the dual structure and high rigidity, the stress due to the screw fastening cannot be sufficiently absorbed, and the displacement due to the screw fastening extends over a wide range.
Portion), there is a problem that the solar cell 1 and the metal plate 2 (the flat plate portion 2a) are separated.

The present invention has been made in view of such circumstances, and provides a solar cell module and a method of installing the solar cell module, which can eliminate the possibility of peeling of the solar cell from the metal plate as described above. With the goal.

[0008]

According to a first aspect of the present invention, there is provided a solar cell module in which a solar cell is bonded to a partial area of a metal plate, wherein the solar cell is not bonded to the metal plate. Is characterized by having a first portion and a second portion having a smaller thickness than the first portion.

In the solar cell module according to the present invention, the first portion having a large thickness and the second portion having a small thickness are provided on a metal plate, and the second portion having the small thickness is screwed. By doing so, the displacement due to the screw fastening is absorbed in the vicinity of the second portion and does not reach the bonding area of the solar cell, and the solar cell does not separate from the metal plate.

According to a second aspect of the present invention, in the solar cell module according to the first aspect, the first portion is formed of multiple metal plates, and the second portion is formed of a single metal plate. It is characterized by the following.

In the solar cell module according to the second aspect, the first portion is constituted by stacking a plurality of metal plates, and the second portion is constituted by one metal plate. Therefore, two portions having different thicknesses can be formed very easily.

According to a third aspect of the present invention, there is provided a method for installing a solar cell module according to the first or second aspect, wherein the solar cell module is installed on a building material.
The solar cell module is screwed and fixed to the building material at a portion.

According to a third aspect of the present invention, the solar cell module is screwed and fixed to a building material (field board) at the second portion (for example, one portion) of the metal plate. The displacement due to the screw fastening is absorbed in the vicinity of the second portion and does not reach the bonding area of the solar cell, so that separation between the solar cell and the metal plate does not occur.

A solar cell module according to a fourth aspect of the present invention is a solar cell module having a structure in which a solar cell is adhered to a metal plate, wherein the metal plate is fixed to a building material with screws. In addition, a portion to be fixed with screws is thinner than other portions.

In the solar cell module according to the fourth aspect, a portion of the metal plate to be fixed with screws is made thinner than other portions. As a result, when the solar cell module is screwed and fixed to a building material (field board), the displacement due to the screwing does not reach the bonding region of the solar cell, and the solar cell and the metal plate do not peel off.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. (First Embodiment) FIG. 1 is a perspective view showing the appearance of a solar cell module 10 according to a first embodiment of the present invention, and FIG.
FIG. 3 is an enlarged partial cross-sectional view showing a solar cell module 10 installed on a ridge side (above the water). As shown in FIG. 1, a solar cell module 10 includes a solar cell 1 having a photoelectric conversion material such as crystalline silicon or amorphous silicon, for example, an EVA (Et)
hylene Vinyl Acetate (ethylene vinyl acetate) resin. The metal plate 2 includes a flat plate portion 2a to which the solar cell 1 is adhered to a partial area thereof, and a first bent portion 2b and a second bent portion 2b formed by bending the flat plate portion 2a toward the eaves side (under water) and the ridge side, respectively. And a bent portion 2c.

The first bent portion 2b on the eaves side is bent substantially vertically downward and then further bent upward by a predetermined angle, and serves as an eaves side engaging portion that engages with the solar cell module 10 on the eaves side. Function. The second bent portion 2c on the ridge side includes a rising portion 2d bent substantially vertically upward,
A horizontal part 2e extending to the solar cell 1 side following the rising part 2d, and a ridge-side engaging part 2f connected to the horizontal part 2e, bent substantially vertically upward, and then bent downward by a predetermined angle. Have been. The plurality of solar cell modules 10 are stepped in a mode in which the ridge-side engaging portions 2f of the eave-side solar cell modules 10 are engaged with the first bent portions 2b of the ridge-side solar cell modules 10. It can be installed.

In the first embodiment, the second bent portion 2c
Of the conventional example (FIGS. 7 and 8)
Rather than a double configuration of the steel plate as shown in FIG. 2), it is divided into a double rising portion 21d having a double configuration of the steel plate and a single rising portion 22d having a single configuration of the steel plate. The horizontal portion 2e exists only in a portion connected to the heavy rising portion 21d, and a ridge side engaging portion 2f similar to the conventional example is formed in connection with the horizontal portion 2e. Therefore, the metal plate 2 in the region where the solar cell 1 is not bonded is provided with a portion where the steel plate has a double configuration (the flat plate portion 2a and the horizontal portion 2).
e) and a portion where the steel plate has a single configuration (only the flat plate portion 2a). A terminal box (not shown) for extracting an electromotive force from the solar cell 1 is provided in a portion where the steel plate has a double configuration. In the first embodiment, only the area where the terminal box is installed has a double configuration, and all other areas have a single configuration.

The solar cell module 10 having such a configuration
Are disposed on the base plate 5 via a backing material 4 made of, for example, styrofoam having excellent heat insulation properties. Then, the solar cell module 10 is fixed to the backing material 4 using the fixing screws 6 in the flat plate portion 2a which is a single configuration of the steel plate.
And is supported and fixed to the base plate 5 via the.

In this case, the portion of the metal plate 2 to be screwed and fixed (the flat plate portion 2a) is thin, so that displacement due to screwing is absorbed in the vicinity of the screwing portion. It does not reach the bonding area between the solar cell 1 and the metal plate 2, and the solar cell 1 and the metal plate 2 do not peel off. As a result, the installation process of the solar cell module 10 can be performed with good yield.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
FIG. 4 is a partial cross-sectional enlarged view showing a solar cell module 10 according to an embodiment, which is installed on a ridge side (above the water) of the solar cell module 10. As in the first embodiment, the solar cell module 10
Is constituted by bonding a solar cell 1 having a photoelectric conversion material such as crystalline silicon or amorphous silicon on a metal plate 2 made of, for example, a steel plate with an adhesive 3 made of, for example, an EVA resin. The plate 2 includes a flat plate portion 2a to which the solar cell 1 is bonded to a partial area thereof, and a first bent portion 2b and a first bent portion 2b formed by bending the plate portion 2a toward the eaves side (under water) and the ridge side, respectively. And two bent portions 2c.

The eave-side first bent portion 2b has a structure in which the first eave-side bent portion 2b is bent substantially vertically downward and then further bent upward by a predetermined angle, and serves as an eave-side engaging portion that engages with the eave-side solar cell module 10. Function. The ridge-side second bent part 2c is a rising part 2 that is double bent substantially vertically upward.
d, a horizontal portion 2e connected to the rising portion 2d and extending toward the solar cell 1, a ridge-side engaging portion 2f connected to the horizontal portion 2e, bent substantially vertically upward, and further bent downward by a predetermined angle. It consists of. The plurality of solar cell modules 10 are stepped in a mode in which the ridge-side engaging portions 2f of the eave-side solar cell modules 10 are engaged with the first bent portions 2b of the ridge-side solar cell modules 10. It can be installed.

In the second embodiment, the structures of the rising portion 2d and the ridge-side engaging portion 2f are the same as in the conventional example (see FIGS. 7 and 8), but the horizontal portion 2e is partially missing. Therefore, the metal plate 2 in the region where the solar cell 1 is not bonded is provided with a portion where the steel plate has a double configuration (the flat plate portion 2a and the horizontal portion 2).
e) and a portion where the steel plate has a single configuration (only the flat plate portion 2a). In the second embodiment, only the region to be screwed and fixed has a single configuration, and the other regions have a double configuration.

Also in the second embodiment, in the single-layered portion (the flat plate portion 2a) of the steel plate in which the horizontal portion 2e is missing,
When the solar cell module 10 is supported and fixed to the base plate 5 via the backing material 4 by using the fixing screw 6, the separation between the solar cell 1 and the metal plate 2 is performed similarly to the first embodiment. Does not occur. As a result, the installation process of the solar cell module 10 can be performed with good yield.

Next, a description will be given of actual measurement results obtained by verifying the effects of the present invention. Plural types of metal plates 2 having various thicknesses
Using (steel plate), a solar cell module of the present invention having a single screwed portion and a solar cell module of a conventional example having a double screwed portion are manufactured, and each is screwed. When yielding. The result is shown in FIG. In FIG. 5, the metal plate 2 (steel plate) used on the horizontal axis
The thickness (mm) of one sheet and the yield (%) are plotted on the vertical axis, and the characteristics are shown. In the case of a single configuration (the present invention),
-□-indicates the case of a double configuration (conventional example).

Metal plate 2 (steel plate) having a thickness of 0.5 mm or less
When using the effect of the present invention is not clear,
It can be seen that, when a thicker metal plate 2 (steel plate) is used, the yield can be greatly increased in the present invention as compared with the conventional example.

Next, when the thickness of the entire metal plate 2 (steel plate) is the same, which one of the single configuration and the double configuration is more advantageous will be considered. A solar cell module was manufactured using each of the metal plates 2 (steel plates) having a single configuration and a double configuration having the same overall thickness, and the yield when each was screwed was determined. The result is shown in FIG. ,
In FIG. 6, the horizontal axis represents the overall thickness (m) of the metal plate 2 (steel plate).
m), and the vertical axis indicates the yield (%) to show the characteristics.
-●-indicates a single configuration, and-□-indicates a double configuration.

When the total thickness of the metal plate 2 (steel plate) is larger than 1 mm, the yield is higher in the double configuration than in the single configuration, and the solar cell and the metal plate It can be seen that peeling is less likely to occur.

In the above-described example, the single-piece structure of the steel sheet,
Due to the difference of the double configuration, a thin portion and a thick portion are provided on the metal plate 2, but differently,
It is a matter of course that the thickness of the screwed portion may be made thinner than the other portions by a processing process in the form of a single steel plate.

[0030]

As described in detail above, according to the present invention, a thinner portion is provided on a metal plate to which a solar cell is bonded, and the solar cell module and a building material are screwed to the thinner portion. Since it is fixed, the displacement due to the screw fastening can be absorbed in the vicinity thereof, and it is possible to prevent the solar cell and the metal plate from being separated from each other by preventing the displacement to the bonding area, thereby improving the yield. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a solar cell module according to a first embodiment.

FIG. 2 is an enlarged partial cross-sectional view illustrating a solar cell module according to the first embodiment, which is installed on a ridge side (above the water).

FIG. 3 is a perspective view illustrating an appearance of a solar cell module according to a second embodiment.

FIG. 4 is an enlarged partial cross-sectional view showing a solar cell module according to a second embodiment, which is installed on a ridge side (above the water).

FIG. 5 is a graph showing the yield of each of the solar cell modules having a single screw structure and a double screw structure.

FIG. 6 is a graph showing the yield of each solar cell module having a single configuration and a double configuration by equalizing the entire thickness of the screw fastening portion.

FIG. 7 is a perspective view showing the appearance of a conventional solar cell module.

FIG. 8 is an enlarged partial cross-sectional view showing a conventional solar cell module installed on a ridge side (above the water).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solar cell part 2 Metal plate 3 Adhesive 4 Backing material 5 Ground plate 6 Fixing screw 2a Flat plate part 2c 2nd bending part 2e Horizontal part 10 Solar cell module

Claims (4)

[Claims] 1. In a solar cell module in which a solar cell is bonded to a part of a metal plate, a region of the metal plate where the solar cell is not bonded is thicker than the first part and the first part. A second portion having a small thickness. 2. The solar cell module according to claim 1, wherein the first portion is constituted by multiple metal plates, and the second portion is constituted by a single metal plate. 3. A method for installing the solar cell module according to claim 1 or 2 on a building material, wherein the solar cell module is fixed to the building material with screws at the second portion of the metal plate. How to install a solar cell module. 4. A solar cell module having a structure in which a solar cell is adhered to a metal plate, wherein the metal plate is fixed to a building material with screws. A solar cell module, wherein a part is thinner than other parts.