Reflecting film for photovoltaic module and preparation method of reflecting film

A photovoltaic module and reflective film technology, which is applied in the field of solar energy, can solve problems such as inability to convert, solar cells reduce photoelectric conversion efficiency, and affect the safe operation of photovoltaic modules, so as to achieve the effect of improving utilization

Pending Publication Date: 2021-07-13
华能陕西发电有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Conventional photovoltaic power generation technology can only use the energy of short and medium wavelength bands (such as wavelength <1100nm) of solar energy, and the existing technology of using reflective film to directly reflect light to the back of photovoltaic modules, although the back radiation is increased, but the long-wave band energy can not only Converting into electrical energy will also cause solar cells to heat up and reduce their photoelectric conversion efficiency, which affects the safe operation of photovoltaic modules

Method used

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  • Reflecting film for photovoltaic module and preparation method of reflecting film
  • Reflecting film for photovoltaic module and preparation method of reflecting film
  • Reflecting film for photovoltaic module and preparation method of reflecting film

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Embodiment 1

[0034] Beamsplitters are used to reflect and transmit light. According to different spectral characteristics, beamsplitters can be divided into neutral beamsplitters and dichroic beamsplitters. A neutral beamsplitter can split a beam of light into two beams with the same spectral composition; a dichroic beamsplitter can reflect one part of the spectrum and transmit the other part.

[0035] The invention provides a reflective film for a photovoltaic module. Different cut-off wavelengths can be selected according to the photovoltaic module used. Common wavelengths are 900nm, 1100nm, 1500nm, 1800nm ​​and the like.

[0036] In the following, the cutoff wavelength is 900nm as an example for illustration. The reflective film of the present invention performs light splitting at 900nm to divide the solar spectrum into two parts, long wave and short wave. The long-wavelength light can use its thermal energy. The 900nm cut-off wavelength can be selected from GaAs single-junction solar...

Embodiment 2

[0044] The present invention also provides a method for preparing a reflective film for a photovoltaic module. The preparation of the coating film is completed on a 900Plus box-type vacuum coating machine produced by the German Leybold company.

[0045] The vacuum system of the box-type vacuum coating machine adopts the configuration of mechanical pump + oil diffusion pump, and the ultimate vacuum can reach 2×10 -4 Pa. Evaporation sources are: two e-type electron guns and two sets of anti-evaporation electrodes. The high voltage of the two electron guns is 10KV, and the voltage of the resistance evaporation electrode is 6V, and the power of the evaporation source can be adjusted according to the needs. The fixture is a magnetic fluid sealed high-speed rotary fixture with adjustable speed up to 800rad / min.

[0046] Film thickness monitoring adopts 4-probe IC / 5 quartz crystal oscillator + transparent and reflective optical direct monitoring, and is equipped with OMS3000 automa...

Embodiment 3

[0054] The present invention also provides a method for preparing a reflective film for a photovoltaic module, comprising:

[0055] The first step is to use CNC numerical control machine tools with high processing precision, high rigidity and high degree of automation to cut glass blanks into semi-finished products;

[0056] In the second step, the glass engraving and milling machine is used to shape and edge the semi-finished lens;

[0057] The third step is to polish the carved lenses. The mechanism of polishing is the same as that of grinding, except that the tool material used is different from the polishing fluid. Usually, it is necessary to achieve a high-precision polishing surface. The most commonly used material is high-grade polishing asphalt. Using asphalt to polish is to use the fine surface of asphalt to drive the polishing liquid to grind the surface of the lens to generate heat, so that the glass melts and flows, melts away the rough apex and fills the bottom o...

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Abstract

The invention discloses a reflecting film for a photovoltaic module and a preparation method of the reflecting film. The reflecting film comprises a substrate and a coating film arranged on the substrate; the coating film comprises a first material coating film layer and a second material coating film layer which are sequentially arranged on the substrate in an overlapping manner; the bottom layer and the topmost layer of the coating film are first material coating film layers; and the first material coating layer and the second material coating layer are made of materials with different refractive indexes. According to the invention, through the coating design, the reflecting film is used for splitting solar energy and dividing a solar spectrum into two parts, namely a long wave part and a short wave part, and short-wave-band light energy is reflected on the mirror surface of the reflecting film for photovoltaic use, so that temperature rise of the photovoltaic module caused by direct irradiation of infrared long waves on the back surface of the double-sided photovoltaic module is avoided; and therefore, the photovoltaic module works at a temperature with higher photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar energy, and in particular relates to a reflective film for a photovoltaic module and a preparation method thereof. Background technique [0002] Photovoltaic modules are composed of high-efficiency crystalline silicon solar cells, backplanes and frames. Traditional photovoltaic modules are single-sided photovoltaic modules, which can only receive sunlight from the front to generate electricity, and their energy utilization rate is limited; in order to increase the power generation capacity of photovoltaic power plants, the area of ​​photovoltaic modules can only be continuously expanded, occupying a large amount of land , and the increase in area also increases the management cost of personnel. [0003] In order to solve the technical problem that single-sided photovoltaic modules can only receive solar light from the front to generate power, double-sided photovoltaic modules came into being. Doub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/22C23C14/02C23C14/08C23C14/10C23C14/30
CPCC23C14/022C23C14/083C23C14/10C23C14/30H02S40/22Y02E10/52
Inventor 张红星李庆义宋戈彭文博郑清伟高虎房小源齐国营王本忠郭春友吴智强李晓磊田鸿翔马铭远
Owner 华能陕西发电有限公司
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