JPS6281777A - Light converging type solar battery module - Google Patents

Abstract

PURPOSE:To prevent increase in temperature, by providing an optical filter, which shields a long wavelength light beam, that does not contributes to photoelectric conversion, on the light receiving surface of a solar battery element. CONSTITUTION:On the light receiving surface of a silicon solar battery element 5, an optical filter 8 is bonded with a silicon resin as a transparent resin 6. As the optical filter 8, hard glass, on which an evaporated film is formed, or into which a filtering characteristic is imparted, is used. The filter can be attached to the framework of a module without directly bonding to the light receiving surface. The optical filter 8 has the characteristic, which shields a long wavelength light beam that does not contributes to the photoelectric conversion of the silicon solar battery element 5. The wavelength is properly determined based on the material and the characteristics of the silicon solar battery module. In the case of the silicon solar battery module, e.g., wavelengths of 1.0mum or more are shielded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a concentrating solar cell module.

[Conventional technology]

As shown in FIG. 2, a conventional solar cell module has a metal plate 3 bonded to a heat sink 1 with a bonding material 2,
The solar cell element 5 is fixed thereon by soldering 41/i more uniformly. As the metal plate 6, a material such as a cover material having a coefficient of thermal expansion similar to that of the solar cell element 5 is selected. Sun'#J
A transparent glass plate 7 is placed over the L11J2 element 5, the transparent resin 6 is completely sealed, and the element is cooled by water or air cooling. All of the solar cell modules mentioned above are attached to the base array system, and the light concentration magnification is increased by a concentrator to obtain a highly efficient solar pond.

[Problem that the invention seeks to solve]

However, in this method, almost all wavelengths are reflected on the light-receiving surface of the solar cell module, and since it receives the first field light, it absorbs optical sound on the long wavelength side, which affects the temperature rise of the element. As a result, the temperature of the device and surrounding structures increases, device efficiency decreases, and electrical characteristics and reliability are also adversely affected. Concentrating solar cell modules pose a problem, especially since light is concentrated on the light-receiving surface.

The object of the present invention is to provide a structure that completely eliminates these drawbacks and prevents temperature rise.

[Means to solve all problems]

Is there a problem with this invention? To solve this problem, an optical filter is provided on the light-receiving surface of the solar cell element to completely block long-wavelength light NM, which contributes little to photoelectric conversion.

[For production]

By passing the light received from the condenser through an optical filter, the light on the long wavelength side is cut off, and only the light that matches the spectral characteristics of the cord is completely absorbed.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.
C.Explain.

FIG. 1 is a sectional view of a battery module made of silicon according to the present invention. A metal plate 6 is added to Vc on the aluminum surface of the heat sink 1 using a contacting material 2. The adhesive material 2 and the metal plate 3 may be of any material as long as it has good thermal conductivity and has a relatively similar coefficient of thermal expansion to the element. Examples include epoxy resin Tocopar material? Friend. A silicon solar cell element 5 is uniformly soldered and fixed to the metal plate 3 with solder 4. An optical filter 8 is layered as a transparent resin 6 on the light-receiving surface of the silicon solar cell element 5 using silicone resin. As the optical filter 8.

A vaporizer film is formed on hard glass, and the glass itself has filter characteristics.

Direct light reception [i] VC may be attached to the module frame without adhesive. The optical filter 8 has a characteristic of completely blocking long wavelength light that contributes little to the optical if conversion of the silicon solar cell element 5.

The above wavelength is appropriately determined depending on the material and characteristics of the solar cell element used, and in the case of a silicon solar cell module, for example, wavelengths of 1.0 μm or more are blocked.

〔Effect of the invention〕

Since long wavelength light dTh, which contributes little to photoelectric conversion efficiency, is blocked by an optical filter, it absorbs only light at wavelengths that meet the spectral characteristics of the device, thereby reducing external noise due to the temperature of the solar cell element and surrounding structures. I can do it. This improves the reliability of the module.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a silicon solar cell module according to the present invention. FIG. 2 is a sectional view of a conventional silicon VIJ battery module. 1... Heat sink, 2... Contact layer material, 6...
- Metal plate, 4...Solder, 5...Solar cell element, 6...Transparent resin, 7...Transparent glass plate, 8...Optical filter. Patent Claimant: NEC Corporation Figure 1 Figure 2

Claims (1)

[Claims] A concentrating solar cell module characterized by having an optical filter on the light-receiving surface of a solar cell element that blocks long-wavelength light that contributes little to photoelectric conversion.