RU2086046C1 - Photoelectric unit - Google Patents

Abstract

FIELD: solar power conversion. SUBSTANCE: device has set of photodetectors which are connected to each other and are located between two layers of polyvinylbutyral. Front side of device is covered with armored glass, back side is covered with sealing film which is designed as composite material which has two external film layers each of which is of 60 mcm deep, and central aluminum foil layer which is of 100- 150 mcm deep and two adjacent polyethylene layers which is of 5- 10 mcm deep. EFFECT: increased functional capabilities. 1 dwg

Description

 The invention relates to semiconductor devices, in particular, to photovoltaic converters of solar energy.

 Known module [1] with a back layer of hardened (aluminum) foil. The panel design includes a sheet of front glass, to which commutated solar cells are glued, and under them aluminum foil with a thickness greater than or equal to 0.025 mm with a rear plastic coating. The layered structure is assembled with gaskets made of a polymer, for example polyvinyl butyral (PVB), between the parts to be glued and heated under pressure to the melting temperature of the adhesive polymers.

 The disadvantage of this module is the lack of reliability due to the presence of a plastic coating only on the back of the aluminum foil and the absence of intermediate layers of polyethylene that increase the adhesion of the films to each other.

 Closest to the invention is a solar module [2] consisting of many interconnected silicon wafers (photoconverters) located between two layers of polyvinyl butyral. The module is coated with heat-resistant glass on the front side, and a polyvinyl chloride film on the back side.

 The module thus assembled is heated in vacuo at high temperature and after the molten polyvinyl butyral fills all the cavities, it is cooled.

 The disadvantages of the prototype are not high enough moisture resistance and mechanical strength (puncture) of the polyvinyl fluoride film.

Signs of a prototype common with the invention are as follows:
the module consists of many silicon wafers (photoconverters) connected to each other;
silicon photoconverters are located between two layers of polyvinyl butyral;
from the front side the module is covered with heat-resistant glass;
the assembled module is heated in vacuum and cooled in vacuum.

Signs that distinguish from the prototype and determine the compliance of the invention with the criterion of "novelty", the following:
coating on the back is carried out with a combined material;
the combined material consists of five layers: two outer layers of a PIL-3 brand film 60-70 microns thick each, two layers of a polyethylene film 5-10 microns thick and a central layer of aluminum foil 100-150 microns thick.

 The combined material with a dielectric and weather-resistant coating, consisting of five layers and used as a protection of the module on the back side from environmental influences, was not found in the literature, therefore, according to the authors, the proposed module meets the criterion of "inventive step".

 The purpose of the proposed module is to increase the life of the module due to the low moisture permeability and high mechanical strength of the sealing back film.

 The goal is achieved in that in the photovoltaic module, consisting of a plurality of photoconverters connected to each other, located between two layers of polyvinyl butyral, the front side is covered with toughened glass, and on the back there is a sealing coating in the form of a combined material, which is two outer layers with a thickness of 60- 70 microns each of a polyethylene terephthalate laminated film (PNL-3 brand), a central layer of aluminum foil 100-150 microns thick and two layers of a polyethylene film a thickness of 5-10 microns.

 The thickness of the film layers of a polyethylene terephthalate laminated brand PNL-3 60-70 microns is selected based on the required level of electrical insulation of the live parts of the module.

 The thickness of the aluminum layer of 100-150 microns is selected to ensure the protection of photoconverters from climatic and mechanical influences.

 The thickness of each of the two layers of a polyethylene film of 5-10 microns is selected to provide the necessary adhesion of the PNL-3 film and aluminum foil.

 The drawing shows a photovoltaic module.

 The module consists of silicon photoelectric converters 1 interconnected by busbars (not shown in the drawing), two layers of polyvinyl butyral films 2, specially toughened glass 3, films of combined material 4. All these parts of the module are enclosed in a rubber seal 6, which seals the panel perimeter and fixed in the housing 5 of lightweight aluminum alloy.

 Switched silicon photoelectric converters 1 are placed between layers of polyvinyl butyral 2, placed, in turn, between a sheet of special toughened glass 3 from the front of the photoconverters and a film of the combined material 4 from the back.

All of the listed parts of the module are placed in a special cartridge and heated to a temperature of 40-60 ^o C. Then create a vacuum in the cartridge, bring the temperature to 125-160 ^o C, compress the module parts and after the molten polyvinyl butyral fills all the cavities, cool. Hardened polyvinyl butyral fastens the parts of the module into a single unit.

Claims (1)

 The photoelectric module, consisting of many photoconverters connected to each other and located between the layers of polyvinyl butyral, and coated on the front side with toughened glass, and on the back side with a sealing film, characterized in that a combined material consisting of two outer layers is used as a sealing film films of polyethylene terephthalate laminated with a thickness of 60 70 microns each, a central layer of aluminum foil with a thickness of 100 150 microns and adjacent two layers of polyethylene 5 to 10 microns thick ene film.