JPH05152596A - Solar cell module - Google Patents

Abstract

PURPOSE:To provide a module of solar cell which makes it possible to prevent a solar cell from destruction and to ensure stabilized supply of output. CONSTITUTION:In a module solar cell, a bypass diode 4 is connected in parallel with each one of multiple solar cells 2 which are sealed in a resin layer 3. In addition, a metallic foil 13 is mounted on the outside air side, to make leveling of the heat generated at the movement of the bypass diode 4, and to discharge the heat to the outside.

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, and more particularly to the structure of a solar cell module including a plurality of solar cells.

[0002]

2. Description of the Related Art A solar cell module includes a plurality of solar cells which are photoelectric conversion elements. The plurality of solar cells are connected in series so that a required voltage can be obtained according to the purpose of use.

FIG. 7 is a sectional view showing an example of the structure of a conventional solar cell module. The structure of this solar cell module is called a superstrate structure, and is generally widely used for applications such as power generation.

In FIG. 7, a plurality of solar battery cells 2 connected in series are enclosed in a resin layer 3 having a light transmitting property. A light receiving surface layer made of a glass plate 7 is provided on the light receiving surface side of the resin layer 3, and a back surface layer 10 made of a weather resistant film having a three-layer structure is provided on the back side of the resin layer 3. The back surface layer 10 is a two-layer resin film 11 having excellent insulation properties.
a and 11c, and a metal foil 11b having a thickness of about 30 μm sandwiched between them for enhancing moisture resistance. In the above solar cell module, since the light-receiving surface layer is made of the glass plate 7 and the back surface layer 10 is made of a weather-resistant film having a three-layer structure, it is possible to prevent dirt from adhering and moisture entering during long-term use under severe environmental conditions. It has excellent weather resistance and high reliability.

FIG. 8 is a sectional view showing another example of a conventional solar cell module. The structure of this solar cell module is called a film sandwich structure and is used in a solar car.

In FIG. 8, a plurality of solar battery cells 2 connected in series are enclosed in a resin layer 3 having a light transmitting property. The light receiving surface layer 1 made of a weather resistant film is provided on the light receiving surface side of the resin layer 3, and the back surface layer 5 made of a weather resistant film is provided on the back side of the resin layer 3. The weather-resistant film forming the light-receiving surface layer 1 and the back surface layer 5 is a single layer having a thickness of about 50 to 100 μm.

[0007]

The conventional solar cell module having the above structure has the following problems.

In the above-mentioned conventional solar cell module, when the sun rays are blocked by trees or buildings and cast a shadow on some of the solar cells, photoelectric conversion is not carried out in the solar cells. If the state continues for a long time, the solar cell will be in a high resistance state. As a result, a reverse bias voltage is applied to the high resistance solar cell, and the solar cell is destroyed.

In such a case, the output is remarkably reduced to about 1/10 of the maximum output under normal conditions. As described above, the conventional solar cell module has a problem in ensuring stable supply of output.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a solar cell module capable of ensuring stable supply of output and having high durability.

[0011]

A solar cell module according to the present invention comprises a plurality of solar cells connected in series with a light-transmitting support layer and embedded in the support layer, and the support layer. A light receiving surface layer formed on the light receiving surface side of the solar cell, a back surface layer formed on the back surface side of the support layer, and a bypass diode connected in parallel to each of the plurality of solar battery cells. The backside layer of the module includes a metal layer on the outside air side.

[0012]

In the solar cell module according to the present invention,
Since the bypass diode is connected in parallel to each of the plurality of solar cells, photoelectric conversion is not performed in a part of the plurality of solar cells due to the influence of shadow, and a reverse bias voltage is applied to such a solar cell. When applied, the current due to the reverse bias voltage is bypassed by the bypass diode. Thereby, the destruction of the solar battery cell is prevented.

Therefore, due to the function of this bypass diode, it is possible to suppress a significant decrease in the output of the solar cell module. Furthermore, since the back surface layer includes the metal layer on the outside air side, the heat dissipation effect of the solar cell module is improved,
As a result, partial heat generation of the solar cell module or total heat generation of the solar cell module due to the bypass diode is suppressed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view showing a structure of a solar cell module according to a first embodiment of the present invention.

As shown in FIG. 1, a plurality of solar cells 2 connected in series are enclosed in a resin layer 3. A bypass diode 4 is connected in parallel to each solar cell 2. Further, the light receiving surface layer 1 made of a transparent resin film is provided on the light receiving surface side of the resin layer 3, and the back surface layer 20 having a two-layer structure is provided on the back side of the resin layer 3. The back surface layer 20 is
It includes a resin film 12 having a thickness of about 50 μm, which is a typical example of a PET (polyester) film or a fluorine film, and a metal foil 13 which is a typical example of an aluminum foil. The resin film 12 is provided on the side in contact with the resin layer 3, and the metal foil 13 is provided on the outside air side. The resin film 12 and the metal foil 13 are laminated using an acrylic adhesive.

The bypass diode 4 is arranged adjacent to the resin film 12.

The solar cell module having the above structure is manufactured as follows. A plurality of solar battery cells in which an EVA (ethylene vinyl acetate) resin developed exclusively for solar cells and a bypass diode 4 are connected in parallel on a back surface layer 20 having a two-layer structure composed of a resin film 12 and a metal foil 13. 2. The light-receiving surface layer 1 made of EVA resin and a transparent film is sequentially laminated, and they are laminated by an ordinary laminating process. As a result, the plurality of solar cells 2 in which the bypass diodes 4 are connected in parallel are EV
It is integrally sealed in the resin layer 3 made of A resin.

In the solar cell module according to the first embodiment described above, since the metal foil 13 is provided on the outside air side of the back surface layer 20, even if the bypass diode 4 generates heat, the heat is generated via the resin film 12. It is conducted to the metal foil 13, leveled in the metal foil 13 and emitted to the outside.

FIG. 2 is a schematic sectional view showing the structure of a solar cell module according to the second embodiment of the present invention.

The solar cell module according to the second embodiment differs from the solar cell module according to the first embodiment shown in FIG. 1 in that a back layer 20 having a two-layer structure consisting of a resin film 12 and a metal foil 13 is provided. Instead, a single metal foil 8 is provided.

According to the solar cell module according to this embodiment, since the single metal foil 8 is provided on the outside air side,
Further, the heat dissipation effect of the solar cell module is improved.

FIG. 3 is a schematic sectional view showing the structure of a solar cell module according to the third embodiment of the present invention.

The solar cell module according to the third embodiment differs from the solar cell module according to the first embodiment shown in FIG. 1 in that the resin in the region between the solar cell 2 and the resin film 12 is removed. That is, the back surface of the solar cell 2 is in direct contact with the resin film 12. The bypass diode 4 is arranged so as to be adjacent to the resin film 12.

In the solar cell module according to this embodiment, the resin is removed from the region between the solar cell 2 and the resin film 12, so that the heat conduction to the metal foil 13 via the resin film 12 is further increased. It becomes easier and the heat dissipation effect is further improved.

FIG. 4 is a schematic sectional view showing the structure of a solar cell module according to the fourth embodiment of the present invention.

As shown in FIG. 4, the solar cell module according to the fourth embodiment differs from the solar cell module according to the second embodiment shown in FIG. 2 between the solar cell 2 and the metal foil 8 alone. The resin in the region is removed, and the back surface of the solar cell 2 is in direct contact with the metal foil 8 alone.

In the solar cell module according to this embodiment, the metal foil 8 alone is provided in contact with the bypass diode 4, so that the heat generated from the bypass diode 4 is
It is directly conducted to the metal foil 8 alone and is discharged to the outside.
Therefore, the heat dissipation effect of the solar cell module is further improved.

In the solar battery module according to this embodiment, since the metal foil 8 alone directly contacts the plurality of solar battery cells 2, it is necessary to insulate the solder protrusions provided on the electrode portions of the solar battery cells 2 by some method. is there.

Further, if the metal foil 8 alone of the solar cell module according to this embodiment is directly attached to the body of the solar car, the cooling effect of the solar cell module during traveling is further enhanced.

The fifth to sixth embodiments apply the present invention to a solar cell module having a superstrate structure.

FIG. 5 is a schematic sectional view showing the structure of a solar cell module according to the fifth embodiment of the present invention. Fifth
In the solar cell module according to the second embodiment, glass plate 7 is used instead of light-receiving surface layer 1 made of a transparent film in the solar cell module according to the first embodiment shown in FIG.

FIG. 6 is a schematic sectional view showing the structure of a solar cell module according to a sixth embodiment of the present invention. Sixth
In the solar cell module according to the second embodiment, glass plate 7 is used instead of light-receiving surface layer 1 made of a transparent film in the solar cell module according to the second embodiment shown in FIG.

Also in these embodiments, the same effects as those of the first to fourth embodiments can be obtained.

As described above, according to the first to sixth embodiments, the heat radiation effect by the wind of the solar battery module is enhanced, and thereby the temperature of the solar battery cell can be lowered. Further, the output during operation can be increased, which is very useful for improving the performance of the solar cell module.

Although a typical example showing the structure of the solar cell module of the present invention has been described, the present invention is not limited to the solar cell module of the above-mentioned example.
For example, the structure of the back surface layer is not limited to the structure of the above-described embodiment, and may have another structure as long as the metal layer is provided on the outside air side.

[0037]

According to the present invention, by connecting a bypass diode in parallel to each of a plurality of solar battery cells, it is possible to prevent the solar battery cells from being destroyed and to significantly reduce the output of the solar battery module. The decrease can be suppressed. Further, since the metal layer having good thermal conductivity is included on the outside air side of the back surface layer, the heat dissipation effect is improved, and the partial temperature increase due to the bypass diode or the overall temperature increase of the solar cell module is suppressed, and the solar cell module Performance deterioration can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a structure of a solar cell module according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a structure of a solar cell module according to a second embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a structure of a solar cell module according to a third embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view showing the structure of a solar cell module according to a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a structure of a solar cell module according to a fifth embodiment of the present invention.

FIG. 6 is a schematic sectional view showing a structure of a solar cell module according to a sixth embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view showing an example of the structure of a conventional solar cell module.

FIG. 8 is a schematic cross-sectional view showing another example of the structure of a conventional solar cell module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light receiving surface layer 2 Solar cell 3 Resin layer 4 Bypass diode 5 Resin film 7 Glass plate 8 Metal foil 10 Back surface layer 11a Resin film 11b Metal foil 11c Resin film 12 Resin film 13 Metal foil 20 Back surface layer In each figure, The same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A predetermined light-transmitting support layer, a plurality of solar cells connected in series and embedded in the support layer, and a light-receiving surface formed on the light-receiving surface side of the support layer. A layer, a back surface layer formed on the back surface side of the support layer, and a bypass diode connected in parallel to each of the plurality of solar cells, the back surface layer including a metal layer on the outside air side. Battery module.