JP2002270883A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module having good characteristics by using a fluorescent material. SOLUTION: The solar battery module 10 comprises a plurality of solar battery cells 11 disposed at an interval. In this module 10, the fluorescent materials are disposed at the interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a solar cell module.

[0002]

2. Description of the Related Art The structure of a conventional solar cell module is disclosed, for example, in Japanese Patent Application Laid-Open No. 11-220147.
This structure is a solar cell element in which a power generation layer is formed on the back side of a glass substrate, and a fluorescent thin film is formed on a light receiving surface of the glass substrate. In such a structure,
The sunlight is converted by the fluorescent thin film on the light-receiving surface side into long-wavelength light having a high use efficiency of the power generation layer made of amorphous silicon, thereby improving the light use efficiency.

[0003]

In such a conventional solar cell module, a fluorescent thin film is formed on the light receiving surface side of the solar cell element. Light may be reduced, and as a result, the total output of the solar cell element may be reduced.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a solar cell module having good characteristics by using a fluorescent material.

[0005]

The main constitution of the present invention is as follows.
A solar cell module in which a plurality of solar cell elements are arranged at intervals, wherein a fluorescent material is arranged at the intervals.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIG. 1A is a plan view of a solar cell module, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is an enlarged cross-sectional view of a main part.
In FIG. 1, a solar cell panel 10 has a substantially rectangular shape in plan view, and a light-transmitting insulating substrate 12 such as glass on the light receiving surface side.
And a weather-resistant member 13 such as a fluororesin or PET resin film on the back side.

[0007] A plurality of solar cell elements 1 each having a rectangular shape in a plan view are provided between the translucent insulating substrate 12 and the weather-resistant member 13.
1 are spaced apart from each other.

The plurality of solar cell elements 11 are sealed with the following structure. Before heating under pressure and vacuum such as PVB or EVA, a plurality of solar cell elements 11 are sandwiched between the sheet-shaped front sealing resin 14s and the back sealing resin 14r, and the front and back surfaces of the solar cell panel 10 By performing vacuum heating while applying pressure, the front sealing resin 14s and the back sealing resin 14r are softened, and the sealing resin 14
Filled with s and 14r, the structure of FIG. 1 is completed.
Here, a transparent material is employed for the surface sealing resin 14s.

Next, the solar cell element 11 will be described in detail. The solar cell element 11 is of a double-sided power generation type capable of generating power on the front surface and the rear surface, and has a transparent conductive film / p-type amorphous semiconductor film / i-type amorphous semiconductor film / n-type crystalline semiconductor substrate from the front side. / I-type amorphous semiconductor film / n-type amorphous semiconductor film. The plurality of solar cell elements 11 are electrically connected as appropriate using lead wires (not shown).

Further, an outer frame made of a metal material such as aluminum can be attached to the outer periphery of the solar cell panel 10.

Next, the arrangement of the fluorescent material, which is a feature of the first embodiment, will be described below. In the first embodiment, fine particles of a fluorescent material are mixed in the back sealing resin 14r. Such a fluorescent material is a back-side sealing resin 14r made of sheet-like PVB or EVA or the like before heating under pressure and vacuum.
Are dispersed and mixed in advance. Then, the solar cell panel 10 is vacuum-heated while being pressurized, so that the fluorescent material is dispersed and mixed in the back surface sealing resin 14r.
The solar cell panel 10 of FIG. 1 is completed.

In the first embodiment, FIG.
As described in the main part enlarged cross-sectional view of (c), the incident light is absorbed by the fine particles of the fluorescent material mixed in the back surface sealing resin 14r, and emits light as a point light source. Is diffusely reflected, and complicatedly enters the front and back surfaces of the solar cell element 11 via an optical path (indicated by an arrow), thereby contributing to power generation. Then, when the double-sided power generation type solar cell element 11 is used as in the present embodiment, power can be generated even when light is incident from the back surface, so that the power generation amount can be further increased.

The fluorescent materials include acriflavine (fluorescence wavelength: 517 nm) and fluorescein (fluorescence wavelength: 53
0-570 nm), rhodamine 6G (fluorescence wavelength: 55
1.5-607 nm), rhodamine B (fluorescence wavelength: 57
2.5-627 nm), 3,3′-diethyltricarbocyanine iodide (fluorescence wavelength: 796 nm), chloroaluminum phthalocyanine (fluorescence wavelength: 755.5 nm)
Etc. are available. Although the solar cell element 11 of the present embodiment includes an amorphous semiconductor film but uses an n-type crystalline semiconductor substrate, it is the same as a pn junction crystalline solar cell using a general thermal diffusion method. Such spectral sensitivity characteristics are provided.
Therefore, a fluorescent material having a fluorescent wavelength of about 600 nm or more is more preferable.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different components will be described.

The back sealing resin 24r includes a front sealing resin 1
Utilizes a transparent resin made of the same material as 4s and does not include a fluorescent material.

On the back side of the solar cell panel 10, a plate-like weather-resistant member 23 made of acrylic or the like is arranged. The weather-resistant member 23 is a member in which fine particles of a fluorescent material are substantially uniformly dispersed and mixed. 2B, the incident light is absorbed by the fine particles of the fluorescent material mixed in the weather-resistant member 23 on the back surface, and emits light as a point light source. The light that is not absorbed is irregularly reflected, enters the front and back surfaces of the solar cell element 11 via a complicated optical path (indicated by an arrow), and contributes to power generation. Some light passes through the solar cell panel 10.

In the second embodiment, the fluorescent material is substantially uniformly mixed in the weather-resistant member 23. However, as another example, when the weather-resistant member 23 is made of an opaque material, the fluorescent material is mixed. A fluorescent material can be mixed or applied to the inner surface.

FIG. 3 is a plan view showing an application example of the first and second embodiments, and the cross-sectional structure is the same as that of the first or second embodiment. In FIG. 3, a plurality of solar cell elements 11 are arranged at intervals and are arranged so as to draw XY characters. Then, a back surface sealing resin containing a fluorescent material or a weather-resistant sealing member is disposed between the solar cell elements 11. Therefore, the person in FIG.
When the solar cell panel 10 is viewed, since the color tone of the reflected light from the fluorescent material and the color of the reflected light from the solar cell element 11 are different from each other, it is possible to recognize the XY characters composed of the array of the solar cell elements 11. . Further, by adding a phosphorescent material in addition to the fluorescent material, the phosphorescent material emits light even after sunset, so that a person can recognize the XY characters.

In this embodiment, a double-sided power generation type solar cell element is used, but the same effect can be obtained by using a well-known surface power generation type solar cell element.

[0020]

According to the present invention, the light incident on the space between the solar cell elements is absorbed and emitted by the fluorescent material.
Since the light is incident on the back surface or the front surface of the solar cell element, the output from the solar cell element can be improved. Further, since the color tone of the reflected light from the fluorescent material is different from the color tone of the reflected light from the solar cell element, a person can easily recognize the existence of the solar cell module.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, wherein (a) is a plan view,
(B) is an AA sectional view in (a), and (c) is an enlarged sectional view of a main part.

FIG. 2 shows a second embodiment of the present invention, wherein (a) is a sectional view,
(B) is a principal part enlarged sectional view.

FIG. 3 is a plan view showing an application example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Solar cell panel 11 Solar cell element 13, 23 Weatherproof member 14s Surface sealing resin 14r, 24r Back sealing resin

Claims (4)

[Claims] 1. A solar cell module in which a plurality of solar cell elements are arranged at intervals, wherein the solar cell is formed by using a light-transmitting insulating substrate on a light-receiving surface side and a weather-resistant member on a rear surface side. A solar cell module having a structure in which an element is interposed therebetween and a sealing resin is filled in an internal gap, and a fluorescent material is provided on an inner surface side of the weather-resistant member. 2. A solar cell module in which a plurality of solar cell elements are arranged at intervals, wherein the solar cell element is interposed between a front surface sealing resin and a rear surface sealing resin to receive light. A solar cell module in which a light-transmitting insulating substrate is disposed on a surface side and a weather-resistant member is disposed on a back side, wherein the back-side sealing resin contains a fluorescent material. 3. A solar cell module in which a plurality of solar cell elements are arranged at intervals, wherein a fluorescent material is arranged at said intervals. 4. The solar cell module according to claim 1, wherein the solar cell element is of a double-sided power generation type capable of generating power on the front surface and the back surface.