JPH07131046A - Solar cell generator - Google Patents

Abstract

PURPOSE:To ensure insulation while protecting the substrate of solar cell battery against crack at low cost by forming a first insulation layer, a plurality of solar cell substrates, a second insulation layer, an insulating film, a third insulation layer and a metal plate sequentially on a shading insulating substrate. CONSTITUTION:In the solar cell generator, an insulation film 8 and a third insulation layer 9 are formed sequentially between a second insulation layer 4 and a metal plate 5. Consequently, a solder protruding from a solar cell substrate 3 through the second insulation layer 4 is stopped by the insulation film 8 and the distance between the solar cell substrate 3 and the metal plate 5 is prevented from shortening due to the protrusion of solder. This structure ensure the insulation and protects the solar cell substrate 3 against crack thus decreasing the thickness of insulation layer and reducing the cost. Furthermore, the insulation film 8 is not deteriorated even if the temperature of solar generator increases due to the irradiation of light to cause deterioration of the insulation layer, and thereby high insulation is sustained as a whole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell power generator having a metal plate integrated with a building material used for a roof, for example.

[0002]

2. Description of the Related Art A conventional solar cell power generator of this type has a structure shown in FIG. In the figure, 1 is a translucent insulating substrate such as glass, 2 is a first insulating layer made of ethylene vinyl acetate (hereinafter referred to as EVA) formed on the insulating substrate 1, and 3 is a first insulating layer 2. Formed on the solar cell substrate 3, 4 is a second insulating layer made of EVA formed on the solar cell substrate 3, 5 is a metal plate for improving fire resistance, and 6 is each solar cell. These are two tabs provided on the front surface of the substrate 3, and the tips of the tabs 6 are connected to the back surface of the adjacent solar cell substrate 3 by soldering, and the plurality of solar cell substrates 3 are electrically connected. The solar cell power generator is configured by laminating the first insulating layer 2, the solar cell substrate 3, the second insulating layer 4, and the metal plate 5 that are sequentially stacked on the insulating substrate 1.

[0003]

In the conventional device described above, when the second insulating layer 4 is melted by laminating, as shown in FIG. 3, solder projections 7 are formed on the back surface of the solar cell substrate 3.
If so, the second insulating layer 4 avoids the protrusions 7 and wraps around the protrusions 7, the distance between the solar cell substrate 3 and the metal plate 5 is shortened, and the insulating property is deteriorated. Further, there is a problem that the solder protrusions 7 may penetrate the second insulating layer 4 and directly hit the metal plate 5, and the solar cell substrate 3 may be broken during lamination.

The second insulating layer 4 may have a large film thickness in order to secure the insulation and prevent the solar cell substrate 3 from cracking. There is a problem that it becomes high. Furthermore, when the solar cell power generation device is installed outdoors, there is a problem that the temperature of the device itself rises due to the irradiation of sunlight, and the volume resistivity of the insulating layer decreases accordingly, resulting in a decrease in insulation. The present invention has been made in consideration of the above points, and an object of the present invention is to provide an inexpensive solar cell power generation device capable of ensuring insulation and preventing substrate cracking of a solar cell substrate.

[0005]

In order to solve the above-mentioned problems, a solar cell power generation device of the present invention comprises: a first insulating layer formed on a translucent insulating substrate; and a first insulating layer formed on the first insulating layer. A plurality of solar cell substrates formed, a second insulating layer formed on each solar cell substrate, an insulating film formed on the second insulating layer, and a third insulating layer formed on the film. An insulating layer,
And a metal plate formed on the third insulating layer.

[0006]

The solar cell power generator of the present invention configured as described above has an insulating film between the second insulating layer and the metal plate.
Since the third insulating layer is formed by being sequentially laminated, the insulating film suppresses the solder protrusion of the solar cell substrate that pierces the second insulating layer, and the distance between the solar cell substrate and the metal plate can be shortened by the solder protrusion. It is suppressed, the insulating property is secured, the substrate crack of the solar cell substrate is prevented, the thickness of the insulating layer used is reduced, and the cost is reduced. Further, even when the solar cell power generation device is in a high temperature state due to light irradiation or the like, according to the present invention, the insulation property of the insulation film is deteriorated even if the insulation property of the insulation layer (EVA) is deteriorated. Since it does not occur, the insulating property of the entire device is kept high.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described with reference to FIGS. In these drawings, the same reference numerals as those in FIG. 3 indicate the same or corresponding ones, and the difference from FIG. 3 is that polyethylene terephthalate (hereinafter referred to as PET) is provided between the second insulating layer 4 and the metal plate 5. Insulating film 8
The third insulating layer 9 made of EVA is sequentially laminated.

Next, the experimental results will be described. Insulation resistance before withstand voltage measurement, withstand voltage (DC, leakage current 0.5 mA or less), and insulation resistance after withstand voltage measurement were measured for each 2 panels of EVA used. First, in the present invention, between the solar cell substrate 3 and the metal plate 5 (EVA / PET / E
Table 1 shows the results when the thickness of EVA used for VA) is 0.4 mm and 0.8 mm. The PET has a thickness of 0.
It is fixed at 1 mm.

[0009]

[Table 1]

Next, in the conventional example, Table 2 shows the results when the thickness of EVA used between the solar cell substrate 3 and the metal plate 5 (only EVA 1 layer) was 0.8 mm, 1.6 mm, and 2.4 mm. Show.

[0011]

[Table 2]

As shown in those tables, in the present invention, there was no problem in the withstand voltage in any case, whereas in the conventional example, in the case of 0.8 mm, both panels cause dielectric breakdown and the withstand voltage is increased. In the case of 1.6 mm, there was no backlash, and one panel out of two panels caused dielectric breakdown and had no withstand voltage. Also,
In the case of 2.4 mm, there was no problem with the withstand voltage of both panels, but the cost increased.

Next, since the volume resistivity value of EVA decreases due to the temperature rise, the panel temperature is set to 2 in consideration of the high temperature.
The temperature was set to 5 ° C, 50 ° C, and 75 ° C, and the insulation resistance at each temperature was measured. First, in the present invention, Table 3 shows the results when the EVA thickness between the insulating film 8 and the metal plate 5 is 0.4 mm and 0.8 mm.

[0014]

[Table 3]

Next, in the conventional example, Table 4 shows the results when the EVA thickness between the solar cell substrate 3 and the metal plate 5 is 1.6 mm and 2.4 mm.

[0016]

[Table 4]

As shown in those tables, in the present invention, there was no problem in the insulation resistance in any case, whereas in the conventional examples, the insulation resistance value decreased due to the temperature rise in any case.

As described above, the second insulating layer 4 and the metal plate 5
Since the insulating film 8 and the third insulating layer 9 are sequentially laminated between and, the insulating film 8 suppresses the solder protrusion on the back surface of the solar cell substrate 3 that pierces the second insulating layer 4, The shortening of the distance between the solar cell substrate 3 and the metal plate 5 due to the protrusion is suppressed, the insulating property is secured, the substrate cracking of the solar cell substrate 3 is prevented, the thickness of the insulating layer used is reduced, and the cost is reduced. Further, even when the solar cell power generation device is in a high temperature state due to light irradiation or the like, according to the present invention, even if the insulating property of the insulating layer (EVA) is lowered, the insulating property of the insulating film 8 is reduced. Since it does not decrease, the insulating property of the entire device is kept high. The insulating film 8 is preferably a white insulating film which has high reflection efficiency and can maximize the incident light.

[0019]

Since the present invention is constructed as described above, it has the following effects. Since the solar cell power generation device of the present invention is formed by sequentially stacking the insulating film 8 and the third insulating layer 9 between the second insulating layer 4 and the metal plate 5, the second insulating layer 4 is pierced. The insulating film 8 suppresses the solder protrusions on the back surface of the solar cell substrate 3, the shortening of the distance between the solar cell substrate 3 and the metal plate 5 due to the solder protrusions is suppressed, and the insulation can be ensured. 3 can prevent the substrate from cracking, reduce the thickness of the insulating layer used, and reduce the cost. Further, according to the present invention, even when the solar cell power generation device is in a high temperature state due to light irradiation or the like, the insulating layer (EV
Even if the insulating property of A) is reduced, the insulating property of the insulating film 8 is not reduced, so that the insulating property of the entire device is kept high.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view of one embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Translucent Insulating Substrate 2 First Insulating Layer 3 Solar Cell Substrate 4 Second Insulating Layer 5 Metal Plate 8 Insulating Film 9 Third Insulating Layer

Claims (1)

[Claims] 1. A first insulating layer formed on a translucent insulating substrate, a plurality of solar cell substrates formed on the first insulating layer, and formed on each solar cell substrate. A second insulating layer, and an insulating film formed on the second insulating layer,
A solar cell power generator comprising a third insulating layer formed on the film and a metal plate formed on the third insulating layer.