• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a photovoltaic module (1) comprising a plurality of electrically interconnected at least on one side in an encapsulation film (5) embedded spaced apart solar cells (2) and optionally a backsheet (6) and a translucent cover plate of solar cells (2) free areas the photovoltaic module (1) light-conducting, prism-like structures (4) forming films integrated, wherein the prism-like structures (4) and complementary air and gas inclusions (8) are arranged alternately, wherein the prism-like structures (4) of the photoconductive films are arranged so directed in that light striking the light-conducting, prism-like structures (4) is conducted in the direction of the solar cells (3), and the films which form light-guiding, prism-like structures (4) are optionally covered by a transparent polymer film.
    公开号:AT516194A1
    申请号:T647/2014
    申请日:2014-08-20
    公开日:2016-03-15
    发明作者:
    申请人:Joanneum Res Forschungsgmbh；
    IPC主号:
    专利说明:

    The present invention relates to a photovoltaic module comprising a plurality of electrically interconnected, at least on one side embedded in an encapsulation material, in particular an encapsulation film spaced apart So¬larzellen and optionally a backsheet and a translucent cover plate.
    Photovoltaic modules usually comprise a plurality of solar cells which are electrically interconnected to one another and which are arranged in a planar manner inside the photovoltaic module. Between the individual solar cells and, in particular, at the edge of the photovoltaic module, areas which are not covered by solar cells and thus are not available for the use of solar energy To be available. In this case, the gaps between the individual cells are usually relatively narrow, but the performance of the modules is impaired by the usually about 2 cm wide edge, which is electrically non-active and currently also unusable, so that in total only about 90 % of the module surface is covered with solar cells and are available for the conversion of sunlight into energy, which in total means a not inconsiderable unused area. In order to minimize such a loss of convertible solar energy, various solutions have been proposed lately in which structured films are used, with which the reflection of the sunlight from those areas in which solar cells are not present, to areas in which solar cells are present , is to be supported in order to maximize the energy yield.
    Thus, for example, US Pat. No. 5,994,641 A describes a photovoltaic module in which a backsheet is used, which is provided with light-reflecting means, in particular a symmetrical, V-shaped sawtooth profile, on whose inclined surfaces the incident light is incident to the Solar cells provided areas should be reflected. A disadvantage of such a solution is that the V-shaped sawtooth profiles are symme¬trisch and that light is reflected both to the center of the photovoltaic module and to the outside, so that in turn only a small part of the light, which does not impinge directly on the solar cell, can be reflected on this and is available for further energy production.
    Another such solution is described in WO 2010/096700, in which a micro-embossed reflective optical film is arranged in those areas of the photovoltaic module which are not covered by the solar cells. Also in this solution, films or films are brought into use, in which substantially regular prism-shaped structures are embossed and with which an attempt is made, by means of reflection, to receive the light incident on the areas of the photovoltaic module not covered by solar cells for conversion into electrical energy to win by trying to reflect it on the present in the Photovoltaikmo¬dul solar cells. The structures used in this document also essentially have the form of symmetrical prisms and thus it is not ensured that light is reflected exclusively in a desired direction to the solar cells. However, in all currently known systems it is necessary for the structured films to be provided with a reflective coating, in particular a metal coating.
    The present invention now aims to provide a photovoltaic module available, with which it is not only possible to use the light incident between the individual solar cells for a conversion into energy, but in particular that light which impinges on the free edge regions of the photovoltaic module to reflect such that it impinges on a solar cell in the interior of the module and can be used for conversion into electrical energy and thus the energy yield of the photovoltaic module compared to conventional photovoltaic modules is significantly increased.
    In order to achieve this object, the photovoltaic module according to the invention is essentially characterized in that light-conducting, prism-like structures forming films are integrated into areas of the photovoltaic module which are free from solar cells, such that the prism-like structures of the photoconductive films are arranged such that the prism-like ones alternately Structures and complementary air and gas injections are arranged, that on the light-guiding prism-like structures incident light is directed in the direction of the solar cells, and that the light-conducting, prism-like structures forming Fo¬lien are optionally covered by a transparent polymer film. By integrating light-guiding, prism-like structures forming films in the photovoltaic module in regions which are free from solar cells, elements are provided which can reflect incident light. Due to the design as prism-like structures, targeted reflection is also made possible by the formation of very specifically shaped reflection surfaces. Furthermore, by arranging the prism-like structures of the light-conducting films in such a way that light striking the light-conducting prism-like structures is directed in the direction of the solar cells, it is ensured that light incident on the edge regions of the photovoltaic module does not remain unused, but also toward the center the photovoltaic module is reflected, where it encounters a solar cell, in which the light energy is converted into electrical energy, whereby the total energy yield of the photovoltaic module is increased to almost 100% of the possible energy yield. In this case, in particular in those areas where the prism-like structures of the light-conducting films are arranged, areas with air or gas inclusions are alternately formed, which have a geometry complementary to the prism-like structures of the film. By virtue of these also prism-like structures, a light pipe succeeds without it being necessary to apply a reflective coating, such as a metal layer, to prism-like structures of the light-conducting film. A significant advantage of the photovoltaic module according to the invention is that a reflective coating which has to be applied to the prism-like structures in order to ensure the reflection of the incident light is not required, as a result of which the module is made considerably simpler and more cost-effective can.
    By optionally further covering the light-conducting, prism-like structures forming films by a transparent polymer film, it is ensured that the fine structures in the light-conducting film are not damaged by mechanical influences and further ensures that in particular in a structure of a photovoltaic module in layer Sandwich construction, the air-filled cavities, in particular prismatic cavities filled and thus made unusable.
    By, as this corresponds to a development of the present invention, the photovoltaic module is formed so that the prism-like structures as oblique, a right angle generally triangular prisms similar structures are formed, a kind Sägezahnprofil is provided, in which those sides which are adjacent to substantially the right angle do not contribute to a reflection, since one of these surfaces serves as a base and the other will reflect very little incident light due to the usually essentially perpendicular incidence of light. The main reflection of the light takes place here at the third surface of the oblique, prism-like structures inclined to a base surface or a rear side plate of the photovoltaic module, in which surfaces are ensured on account of the physico-chemical properties of the material which is available for such purposes It will be appreciated that essentially all of the light incident on this horizontally and horizontally inclined surface of a photovoltaic module is reflected to the center of the module and thus to the solar cells. Such a construction makes it possible to convert essentially all the light into electrical energy and that from the Prior art known losses of about 10% can be drastically reduced to a maximum of 1.5% of the incident light.
    In accordance with a further development of the invention, the photovoltaic module is designed in such a way that a surface of the prism-like structure lying opposite the substantially right angle is designed as a flat surface, a convex, concave or convex / concave curvature-forming surface. Characterized in that by such konstrukti¬ve training of the oblique prisms, in particular those of the right angle gegenüberlie¬genden surface as a flat surface, convex curvature surface having a concave curvature surface having a convex / concave curvature surface having formed and by specific arrangement This oblique prisms such that each of such inclined planar surface, convex, concave or convex / concave curvature auf¬weisende surface are each arranged directed towards a center of the photovoltaic module, it is possible at areas which not through Solar cells are covered einfallen¬ the light reliably to reflect the center of the photovoltaic module and thereby improve overall the light output.
    A particularly efficient reflection and in particular a particularly low loss of incident light and thus a high energy yield is achieved with the photovoltaic module according to the invention in that a flank angle of the prism-like structure is selected between 25 ° and 65 ° and a disturbing flank angle of the prism-like structure between 80 ° and 90 ° is selected. By choosing such a flank angle of the prism-like structure and a Störflankenwinkels the same light and Energieebeutevevel of perpendicular incident light is maximized, since this is asymmetrically directed or reflected only in the direction of the Zen¬trum of the photovoltaic module.
    By further developing the photovoltaic module such that the prism-like structures are formed with a film of between 100 nm and 100 mm, in particular 10 pm to 300 pm, structures are provided which ensure universal use of the photovoltaic modules.
    A further advantage of such an arrangement of a film exhibiting a structuring which has structures which are similar to an oblique prism lies in the fact that due to the internal total reflection taking place in the film, the light is directed in the desired direction to the center so that an additional reflective coating becomes unnecessary. With such a design, the photovoltaic module according to the invention is not only cost-effective, but in particular safer, since electric current from the cells via a reflective, especially metallic coating can not be directed to the edge of the Photo¬Voltaikmoduls and thus any security risks, which may mean, for example, electric shocks or the like , are cleared out.
    By, as corresponds to a development of the invention, the photovoltaic module is so educated that the solar cells are arranged on at least one side on an encapsulation film, the security of the module is further increased, in particular the necessary for the elektri¬sche line interconnections or Head covered by the encapsulation film and insulated. Furthermore, it is ensured with such an encapsulation film that mechanical damage to the photovoltaic module can be obstructed.
    Of course, as is the case with a further development of the invention, the encapsulating material can also be arranged on both sides of the solar cell and moreover, but this is not absolutely necessary, the light-conducting, prism-like structure-forming film can also be provided in the interior of the encapsulation film in order to provide mechanical properties To avoid damage to all elements and in particular the electrical wiring or the conductors against both accidental contact and against damage as far as possible to protect.
    By, as corresponds to a further development of the invention, the backsheet having integrally integrated, prism-like structures on their side facing the solar cells, a further simplification of the photovoltaic module is achieved, it is particularly auszubil¬den in a single layer those photoconductive, prism-like structures which ensure that light incident thereon is directed in the direction of the solar cells, as a result of which the luminous efficacy can be substantially improved.
    In order to make the device as simple as possible in this case, as is the case with a further development of the invention, the photovoltaic module is developed such that the film forming the light-guiding, prism-like structures and the polymer film sealing or covering these structures are made of the same material, selected from polyethylene terephthalate (PET), polyurethane (PU), polyethylene (PE), polyurethane acrylate (PUA), polyamide, polytetrafluoroethylene (PTFE), polystyride (PS), polycarbonate (PC), polyethylene naphthalate (PEN), polymethylmethacrylate (PMMA) or silicone are formed. With such a design, materials which are as similar as possible can be selected which are distinguished only by their refractive index or their geometric structure with which the reflectivity is achieved, so that the same can be achieved with as few materials as possible and at the same time ensured is that a complete reflection on the surface of the photoconductive, structures takes place in the manner of oblique prism-containing film. In order to avoid any losses in the luminous efficacy as far as possible, according to a development of the invention, the photovoltaic module is designed such that the encapsulation film is a polymer film transparent in the range between 300 nm and 2500 nm, in particular 350 nm to 1200 nm, of a material selected from ethylene vinyl acetate ( EVA), polyvinyl butyral (PVB), silicone, thermoplastic polymers (TPE) or polyethylene (PE).
    Due to the fact that, furthermore, a plate made of low-iron glass is used as the cover plate of the photovoltaic module, the transmission is improved. A further improvement of the transmission is ensured by this low-iron glass is completely smooth, without any Tex¬tur formed and preferably has a thickness between 1 nm and 60 mm, in which range of thickness, the glass provides sufficient strength, without the opti¬ rule and photoconductive properties of the overall structure in adversely affect. Needless to say, it goes without saying that any colored glass can also be used or certain surface textures can be used, although in this case a somewhat reduced transmission must be accepted.
    By, as in a further development of the invention, as the back sheet, an electric insulation sheet, in particular, a reflectance of R > 90% is used in a Wel¬lenlängenbereich from 350 nm to 1200 nm having insulating film, it is ensured that no light penetrates the photovoltaic module and in particular all incident light is reflected back from the backsheet into the photovoltaic module in order to further improve the energy yield ,
    The fact that, as corresponds to a development of the invention, the Verkappe¬lungsfolie formed as a reflective barrier layer, in particular electrical insulation film, it is ensured that the solar cell as well as the light-conducting, prism-like structures over other layers isolated, in particular electrically insulated, which clearly demonstrates the reliability elevated. For a materially particularly simple construction of the photovoltaic module, this is essentially characterized in that the encapsulation film, the backsheet and the light-conducting prism-like structure-forming film are formed as reflective, electrical insulating films which reflect more than 90% of the light in a wavelength range between 350 nm and 1200 nm. Such a construction ensures that, on the one hand, as much light as possible is reflected in the substantial range from 350 nm to 1200 nm and, on the other hand, ensures that only that light which is required for a faultless functioning of the photovoltaic module is reflected. In any case, adsorption of light is certainly withheld.
    Further, by not only a cover plate is formed as glass, but also the Rückseitenfolie formed as a glass plate, the apparatus construction is further simplified and in particular the stability of the photovoltaic module against mechanical damage further increased.
    The invention will be explained in more detail with reference to Ausfüh¬rungsbeispielen shown in the drawing. In these show:
    1 shows a structure of a photovoltaic module according to the invention,
    2 a possibility of arranging the elements forming the photovoltaic module one after the other,
    3 a possibility of arranging the elements forming the photovoltaic module one after the other,
    4 shows a further possibility of arranging the elements forming the photovoltaic module one after the other,
    5 is a schematic representation of photoconductive prism-like structures according to the invention;
    6 shows three further possible forms of the light-conducting, prism-like structures which can be used in a photovoltaic module according to the invention, and
    Fig. 7 shows the left outer edge region of the photovoltaic module of Fig. 1, in which in addition to the layer structure of the path of an incident light beam is shown.
    Specifically, 1 in Fig. 1 denotes a photovoltaic module according to the invention. In this photovoltaic module 1 are schematically two spaced from one another
    Solar cells 2 shown. In the construction of the photovoltaic module 1 according to FIG. 1, it is to be understood that an edge region 3 of the photovoltaic module 1 is not occupied by solar cells 2 and this edge region 3 can not contribute to a conversion of sunlight into energy. In order to be able to use the sunlight impinging on this edge region 3 as far as possible for conversion into energy, in the representation of FIG. 1, a plurality of light-conducting structures 4 are provided in both edge regions 3 of the photovoltaic module 1 have an oblique prism. If light impinges perpendicularly on these substantially prism-like structures 4 of the light-conducting elements, this is totally reflected inwardly toward an interior of the photovoltaic module 1, refracted at one of the adjacent prisms and finally at the interface of the glass plate functioning as cover plate 7 again totally reflects the surrounding air, so that this light is available for further conversion to energy, and unlike prior art photovoltaic modules, is not available for conversion to energy. In order to protect the solar cells 2 of the photovoltaic module 1 according to FIG. 1 against any destruction, they are embedded in an encapsulation film 5, as can be seen in FIG. and covered with a glass plate 7. Finally, air 8 is interposed between the plurality of oblique prisms to allow for light steering without the provision of a reflective coating.
    The backplate 6 is an electrically insulating film which has a relatively high reflectance for sunlight to optionally reflect sunlight transmitted to the backplate 6, if necessary, and to have it available for further conversion into energy inside the photovoltaic module 1.
    In the illustration according to FIG. 2, in which the reference symbols of FIG. 1 are essentially retained, a possibility is illustrated how a photovoltaic module 1 according to the invention can be constructed or manufactured.
    In this case, an encapsulation film 5 is firstly applied over a full surface on a glass plate 7, on which encapsulation film 5 the photovoltaic modules 1 and the films with prism-like structures 4 are applied in a next step. As can be clearly seen in FIG. 2, in this case the films with the prism-like structures 4 are applied to that region of the photovoltaic module that is not covered by solar cells 2, and a step that the prism-like structures 4 are covered by a protective film 12. In a further step, a further encapsulation film 5 and a backsheet 6 are applied to this layer. It is needless to say that in order to get to a photovoltaic module, for example, as shown in Fig. 1, only in the area between the solar cells 2 which is free of solar cells, a film having prism-like structures must be stored to to get to the training of Fig. 1.
    Both in the illustration according to FIG. 1 and in that of FIG. 2, the rear side plate 6 can be formed as a plate-shaped element or foil-shaped element, whereby the back side foil can also be integrally formed with the foil having the prism-like structures 4 or directly the prism-like structures may have on their side facing the solar panel 2 side.
    FIG. 3 shows a further possibility of constructing or producing a photovoltaic module according to the present invention.
    In this representation as well, an encapsulation film 5 is applied to a glass plate 7 in a first step, onto which encapsulation film 5 the solar cells 2 are applied in a further step, which in turn are covered by an encapsulation film 5. In the next step, in those areas which are not covered by solar cells 2, the film with prism-like structures 4 is applied, such a production method requiring the protective film 12 which is absolutely necessary in the structure in FIG. 2 for protecting the prism-like structures 4 , can be omitted. Finally, the photovoltaic module 1 is in turn covered by a backsheet or Rücksei¬tenplatte.
    In the illustration according to FIG. 4, essentially the construction is made, as described in FIG. 3, with the exception that after application of the second encapsulating film 5 the backsheet 6 is applied, on which backsheet 6 already the prism-like structures 4 are formed, so that a work step can be saved.
    The prism-like structures 4 have in all embodiments according to the invention, a height between 100 nm and 100 mm, wherein they usually have a height of 10 pm to 300 pm in the most common Einsatzbe¬reichen.
    In the illustration of FIG. 5, an embodiment of the light-conducting, prism-like structures 4 is shown, from which it can be seen that these structures 4 essentially have the shape of an oblique prism, with a substantially right angle, which corresponds to the Störflankenwinkel and which usually between 80 ° and 90 °. In the same way, therefore, the flank angle is chosen below in the size between 25 ° and 65 °, and the flank 9 facing the light is substantially directed such that light incident perpendicularly on it is reflected towards the center.
    In Fig. 6, various shapes of the translucent prism-like structures 4 are shown, wherein Fig. 6a shows a structure having a concave curved flank, with the aid of which light is reflected towards the center of a photovoltaic module 1. In Fig. 6b, another embodiment of the translucent, prism-like structures 4 is shown, in which the light-facing edge 9 of the prism has a convex and concave Krüm-mung, wherein the concave curvature is provided in the region of the foot of the cylinder. Finally, FIG. 6 c shows an embodiment of the translucent, prism-like structures 4, which have a concave / convexly curved flank 9 and which likewise reflect light in the direction of a center of a photovoltaic module 1.
    In Fig. 7, in which the reference numerals of Fig. 1 are maintained, in addition, the path of a perpendicular to the photovoltaic module 1 incident light beam 10 is shown. The perpendicularly incident light beam is reflected at the interface of the structured film 4 with the prismatic air entrapment 8 and deflected one or more neighboring prisms, where it is directed by refraction, in particular when hitting an inclined surface of one of the neighboring prisms 11 in the direction of the glass plate 7 where the light is reflected by total reflection again towards the interior of the photovoltaic module 1 and impinges on a solar cell 2 and is thus available for conversion into energy.
    权利要求:
    Claims (15)
    [1]
    1. Photovoltaic module (1) comprising a plurality of electrically interconnected at least on one side in an encapsulation film (5) embedded spaced apart ange¬ ordered solar cells (2) and optionally a backsheet (6) and a lichtdurchläs¬sigen cover plate , characterized in that in solar cells (2) free areas of the photovoltaic module (1) photoconductive, prism-like structures (4) forming films are inte¬grated that alternately the prism-like structures (4) and complementary air and gas inclusions (8) are arranged in that the prism-like structures (4) of the light-guiding foils are arranged in such a way that light striking the light-conducting, prism-like structures (4) is conducted in the direction of the solar cells (2), and that the light-conducting, prism-like structures (4) form Films are optionally covered by a transparent polymer film (6, 12).
    [2]
    2. photovoltaic module (1) according to claim 1, characterized in that the prism-like structures (4) as oblique, a substantially right angle having three corner prisms similar structures are formed.
    [3]
    A photovoltaic module (1) according to claim 1 or 2, characterized in that a surface of the prism-like structure (4) opposite to the substantially right angle is formed as a flat surface, a convex, concave or convex / concave curvature surface.
    [4]
    4. Photovoltaic module (1) according to claim 1, 2 or 3, characterized in that a flank angle of the prism-like structure is selected between 25 ° and 65 ° and a Störflanks angle of the prism-like structure between 80 ° and 90 ° is selected.
    [5]
    5. photovoltaic module (1) according to one of claims 1 to 4, characterized in that the prism-like structures (4) are formed with a height between 100 nm and 100 mm, in particular 10 pm to 300 pm.
    [6]
    6. Photovoltaic module (1) according to one of claims 1 to 5, characterized in that the solar cells (2) are arranged at least on one side on an encapsulation film (5).
    [7]
    7. photovoltaic module (1) according to one of claims 1 to 6, characterized in that the encapsulation film (5) on both sides of the solar cell (2) is arranged and optionally the light-conducting, prism-like structures (4) forming film in the interior of the Verkappe¬lungsfolie (5 ) are arranged.
    [8]
    8. Photovoltaic module (1) according to one of claims 1 to 6, characterized in that the rear side film (6) has the light-conducting, prism-like structures (4) integrated on their sides facing the solar cells (2).
    [9]
    9. photovoltaic module (1) according to any one of claims 1 to 9, characterized in that the light-guiding, prism-like structures (4) forming film and these structures (4) sealing the polymer film of the same material selected from polyethylene terephthalate (PET), Polyurethane (PU), polyethylene (PE), polyurethane acrylate (PUA), polyamide, polytetrafluoroethylene (PTFE), polystyrene (PS), polycarbonate (PC), polyethylene naphthalate (PEN), polymethyl methacrylate (PMMA) or silicone are formed.
    [10]
    10. Photovoltaic module (1) according to any one of claims 1 to 9, characterized in that the encapsulation film in a range between 300 nm and 2500 nm, in particular 350 nm to 1200 nm transparent polymer film of a material selected from ethylene vinyl acetate (EVA), polyvinyl butyral (PVB ), Silicone or polyethylene (PE) is used.
    [11]
    11. Photovoltaic module (1) according to one of claims 1 to 10, characterized in that a plate made of low-iron glass with a thickness between 1 nm and 60mm is used as cover plate (7).
    [12]
    12. Photovoltaic module (1) according to one of claims 1 to 11, characterized in that as the backsheet (6) an electrical insulation film, in particular a reflectivity of R > 90% in a wavelength range of 350 nm to 1200 nm having insulating film is used.
    [13]
    13. Photovoltaic module (1) according to any one of claims 1 to 12, characterized in that the encapsulation film (5) as a reflective barrier layer, in particular electrical Iso¬lationsfolie is formed.
    [14]
    14. Photovoltaic module (1) according to one of claims 1 to 13, characterized in that the encapsulation film (5), the backsheet (6) and the light-conducting prism-like structures (4) forming film are formed as reflective, electrical insulating films which are more than 90 % of the light in a wavelength range between 350 nm and 1200 nm re¬ reflect.
    [15]
    15. Photovoltaic module (1) according to one of claims 1 to 14, characterized in that the rear side film (6) is designed as a glass plate (7).
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    同族专利:
    公开号 | 公开日
    DE112015003799A5|2017-05-18|
    US20170279407A1|2017-09-28|
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    WO2016025969A1|2016-02-25|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA647/2014A|AT516194B1|2014-08-20|2014-08-20|Photovoltaic module with integrated light-directing structure based on total internal reflection|ATA647/2014A| AT516194B1|2014-08-20|2014-08-20|Photovoltaic module with integrated light-directing structure based on total internal reflection|
    PCT/AT2015/000110| WO2016025969A1|2014-08-20|2015-08-18|Photovoltaic module with integrated light-directing structure on the basis of total internal reflection|
    DE112015003799.3T| DE112015003799A5|2014-08-20|2015-08-18|Photovoltaic module with integrated light-directing structure based on total internal reflection|
    CN201580057097.2A| CN107078171A|2014-08-20|2015-08-18|Photovoltaic module with the Integrated Light guide structure based on total internal reflection|
    US15/505,145| US20170279407A1|2014-08-20|2015-08-18|Photovoltaic module with integrated light-directing structure on the basis of total internal reflection|
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