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INVENTION
Patent of the Russian Federation RU2200357
SOLAR BATTERY
The name of the inventor: A. Fintisov; Kazmin S.I.
The name of the patent owner: Open Joint-Stock Company "Saturn"
Address for correspondence: 350072, Krasnodar, ul.Solnechnaya, 6, Open Joint-Stock Company "Saturn", the patent sector
Date of commencement of the patent: 2001.06.04
The invention relates to electrical engineering, in particular to devices for generating electric energy by converting the energy of light radiation into electrical energy, and is intended for use in solar cell designs containing honeycomb panels. The technical result of the proposed solar battery is the increased reliability of the solar battery, easier assembly and lower degradation of electrical characteristics during operation. Essence: a protective glass plate is glued to the face of each solar cell in a solar cell located on a honeycomb panel with a carbon-fiber bearing surface and consisting of modules formed by solar cells, in series or in series, connected by means of flat metal tires with thermomechanical compensators, On the back surface of the solar battery or a part of it is glued a perforated film substrate that covers all the spaces between the solar cells and leaves most of the rear surface of the solar cells open.
DESCRIPTION OF THE INVENTION
The invention relates to electrical engineering, in particular to devices for generating electric energy by converting the energy of light radiation into electrical energy, and is intended for use in solar cell designs containing flat panels of honeycomb structure.
A solar battery is known [1], designed to provide spacecraft with energy. The solar battery consists of solar cells connected to each other by flexible interconnector connectors, and from honeycomb panels, the surfaces of which are formed by CFRP layers, and the insulating material, between which is a honeycomb filler made of aluminum foil.
The electrogenerating part of the solar battery, consisting of solar cells with protective coatings, is glued to the flat surface of the panel with the help of elastic sealants, while the adhesive composition is applied with a continuous layer.
The disadvantages of this design are the presence of an adhesive in the inter-element gaps, which leads to an increased degradation of the characteristics of the solar battery during operation as a result of the influence of electrification factors, and the technological complexity of providing inter-element gaps during the gluing.
The closest and accepted for the prototype is the solar battery [2] for the GLOBALSTAR spacecraft, consisting of 8 flat panels of honeycomb structure measuring 800x1778 mm. The honeycomb filler is made of aluminum foil and pasted between two sheets of carbon fiber. To provide electrical insulation for carbon fiber reinforced polyimide film Kapton. Solar cells are glued to the polyimide film Kapton with the help of silicone adhesive RTV-S691.
In the power generating part of the solar cell, silicon elements measuring 65.0 × 40.0 mm and a thickness of 200 μm are used. Interelement commutation is performed by silver fiber foil with a thickness of 12.5 microns. On the front surface of solar cells, glass sheets of CMX grade 100 μm thick are glued.
The disadvantage of this design is the technological complexity of gluing the solar cells connected to each other with the required inter-elemental clearances and without damaging the inter-element connectors with thermomechanical compensators. In addition, during the gluing process, some of the glue fills the spaces between the solar cells, which leads to an increased degradation of the characteristics of the solar cell during operation as a result of the influence of electrification factors.
The technical results achieved in the proposed solar cell design are: increased reliability in operation, simpler assembly and lower degradation of electrical characteristics during operation.
This is achieved by the fact that in a solar cell located on a honeycomb panel and consisting of modules formed by solar cells in series or in series connected in parallel with flat metal tires with thermomechanical compensators, and a protective glass plate is glued to the face of each solar cell, On the back surface of the solar battery or a part of it is glued a perforated film substrate that covers all the spaces between the solar cells and leaves most of the rear surface of the solar cells open.
Distinctive features that determine the correspondence of the proposed solar battery to the criterion of "novelty" are the following: the presence of a perforated film substrate on the back side of the solar cells; Making a film substrate with the possibility of overlapping the spaces between the solar cells, while leaving as much open as possible much of the back surface of the solar battery.
The presence of a perforated film substrate located in the above manner ensures absence of an adhesive in the spaces between solar cells and other elements of the design, which significantly reduces the degradation of the electrical characteristics of the solar battery during its operation and excludes the cleaning of inter-element gaps, in which the possibility of inter-element commutation damage is high.
In addition, the arrangement of the perforated film substrate in the above manner ensures the preservation of geometric dimensions and inter-element gaps when affixed to the frame of the panel, which significantly simplifies the assembly technology and the necessary equipment.
Finally, the perforated film substrate of the proposed solar cell design provides additional electrical insulation of the solar cell from the electrically conductive surfaces of the panel frame, which is especially important for honeycomb panels with carbon-plastic surfaces.
To prove the correspondence between the proposed solar battery and the "inventive level" criterion, the entire set of characteristics and separately distinguishing features were analyzed. It has been established that the use of the above-mentioned distinctive features, which together with known features, provides the technical result, which is to improve the specific characteristics of the solar battery (increase in power at the end of the service life due to the reduction of its degradation) and reduce the labor intensity of its manufacture, has not been found in the literature.
Thus, according to the authors, the proposed solar battery meets the criterion of "inventive level".
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Figure 1 schematically shows a section of a solar cell structure on a carbon fiber composite panel. The supporting part of the honeycomb panel consists of two layers of CFRP 1, between which is a honeycomb filler 2 made of aluminum foil. The electro-insulating film 3 is glued to the carbon-plastic surface intended for gluing solar cells. The electrogenerating part of the solar battery (modules) consists of solar cells 4 connected to each other by means of switching elements 5 with temperature compensators. The glass plate 6 is glued to the front surface of each solar cell 4; On the back side, a perforated film substrate 7 is glued to the solar cells. The solar cell modules are glued to the honeycomb panel with an adhesive compound 8. |
An example of a specific embodiment of the proposed solar cell design
The proposed solar battery consists of four rectangular flat honeycomb panels measuring 2.12 × 2.025 m. As an electrical insulation 3 in the panels a polyimide film with a thickness of 40 μm is used. Each panel is equipped with 18 modules, which use solar cells 4 with a thickness of 200 μm and a size of 57.4 × 30.7 mm. The solar cells 4 are connected to successive chains by means of silver bars of 30 μm thickness welded to the contacts of the solar cells 4. The shanks 5 have an s-shaped thermocompensation bending. To the front surface of each solar cell 4 a protective glass 6 is glued. The chains of the connected solar cells 4 with the glued glass plates 6 are laid with the back side upwards into the device with separators providing the required module dimensions and inter-element clearances. Perforated polyimide film 7 with a thickness of 40 μm is adhered to the rear side of solar cells 4 in the module with VK-9 glue, and the perimeter of each solar cell is glued. After curing the adhesive, the module is removed from the device, inspected and glued to the panel in a pre-set location using an adhesive compound 8, which uses the UV 7-21 sealant, which is preliminarily applied to the prepared surface of the panel.
INFORMATION SOURCES
1. Gunther la Roche. Solargeneratoren fur die Raumfahrt. Braunschweig, Wiesbaden Vieweg, Germany, 1997. ISBN 3-528-06945-7.
2. GLOBASTAR. Solar Generator Design And Layout For Low Earth Orbit Application in Consideration Of Commercial Aspects And Quantity Production. D-81663 Munich, Germany.
CLAIM
The solar battery, located on a honeycomb panel with a carbon-fiber bearing surface and consisting of modules formed by solar cells, is connected in series or in series-parallel by means of flat metal tires with thermomechanical compensators, with a protective glass plate glued to the face of each solar cell, and the rear The surface of the solar battery or a part thereof is glued with a perforated film substrate, characterized in that the perforated film substrate is arranged to overlap all the spaces between the solar cells, while leaving most of the rear surface of the solar cells open.
print version
Date of publication 03.02.2007gg
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