WO2013105103A2 - Arrangement for protecting components of a solar concentrator cell assembly - Google Patents

Arrangement for protecting components of a solar concentrator cell assembly Download PDF

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Publication number
WO2013105103A2
WO2013105103A2 PCT/IN2012/000560 IN2012000560W WO2013105103A2 WO 2013105103 A2 WO2013105103 A2 WO 2013105103A2 IN 2012000560 W IN2012000560 W IN 2012000560W WO 2013105103 A2 WO2013105103 A2 WO 2013105103A2
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WO
WIPO (PCT)
Prior art keywords
solar
arrangement
cell assembly
barrier
assembly
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Application number
PCT/IN2012/000560
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French (fr)
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WO2013105103A3 (en
Inventor
Kiran Shah
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Kiran Shah
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Publication of WO2013105103A2 publication Critical patent/WO2013105103A2/en
Publication of WO2013105103A3 publication Critical patent/WO2013105103A3/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Definitions

  • the present invention generally relates to a solar cell assembly.
  • the present invention relates to an arrangement for protecting components of a solar concentrator cell assembly from high intensity solar radiations.
  • solar cell die used hereinafter in this disclosure includes but is not limited to photovoltaic cells, photoelectric cells, multi-junction cells, and devices that convert solar energy into electrical energy/electricity.
  • solar cell assembly used hereinafter in this disclosure includes but is not limited to solar cell , ⁇ ie assembled together with subcomponents including bypass diodes, active devices, interconnects, connectors, and coatings.
  • a solar cell assembly typically built using a multi-junction photovoltaic cell is a solid state electrical device that converts energy of light, particularly concentrated solar radiations directly into electricity by photovoltaic effect.
  • a conventional concentrator cell assembly of a solar cell assembly includes a suitable solar cell die attached to a substrate. More particularly, the solar cell die is attached to the substrate by means of a first thermal interface that is electrically conducting. The substrate in turn is mounted on a heat conducting plate or heat spreader by means of a second thermal interface material. The substrate may include various other delicate electronic components such as a by-pass diode configured thereon.
  • the by-pass diode or other components that extract maximum power from the solar cell die at the same time functioning like a bypass diode if the solar cell die stops generating pre-determined amount of power is configured on the substrate of the concentrator cell assembly when concentrator cell assemblies are connected in series to each other.
  • the by-pass diode facilitates flow of current through a series string made of multiple concentrator cell assemblies, even when a solar cell of any concentrator cell assembly in the series string has stopped functioning.
  • the concentrator cell assembly is covered by a conformal coat made from silicone or urethane based epoxy resin, and other materials for protecting the concentrator cell assembly against corrosion and other detrimental environmental factors.
  • the conformal coat is configured with an opening to accommodate and expose the solar cell to solar radiation.
  • An optical element is disposed just above the opening on the conformal coat such that the solar radiation transmitted through the optical element strikes the solar cell. More particularly, the optical element is adapted to suitably refract solar radiation on-to the solar cell. Typically, the optical element is a lens.
  • the optical element is generally made from non-solarizing material that does not change color even when exposed to harsh concentrated solar radiations for long durations.
  • optical coupling materials including a wide variety of adhesives, are used for locating the optical element at a desired location and alignment with respect to the solar cell.
  • Such a configuration of the solar cell assembly maximizes exposure of the solar cell mounted on the substrate to incoming solar radiations. Due to continuous exposure to concentrated solar radiations the temperature of the substrate rises rapidly. The heating of the substrate along with high intensity solar radiations striking delicate electronic components configured on the substrate may result in heating of the components configured on the substrate and the temperature of the components may reach a temperature that is beyond its operational temperature limit and as a result the components configured on the substrate may stop functioning.
  • short wave radiation, specifically ultra violet (UV) radiation being highly energetic may damage the conformal coat and other materials encapsulating the bypass diode or any other components in the concentrator cell assembly.
  • the temperature of the substrate along with the solar cell and the components is required to be maintained within permissible operating temperature limits.
  • the exposure to short wave radiation including UV radiation also needs to be reduced.
  • the heat conducting plate or heat spreader or heat sink facilitates removal of heat from the solar cell and the substrate by transferring heat from the solar cell and the substrate to air or a thermal fluid capable of dissipating heat, thereby maintaining the solar cell assembly in working condition.
  • the first thermal interface disposed between the solar cell and the substrate facilitates flow of heat from the solar cell to the substrate and the second thermal interface disposed between the substrate and the heat conducting plate facilitates flow of thermal energy from the substrate to the heat conducting plate.
  • the first thermal interface and the second thermal interface include materials like solder, alumina and boron- nitride that facilitate heat transfer.
  • very few effective arrangements are provided for avoiding exposure to concentrated solar radiation on the components configured on the substrate.
  • the components configured on the substrate are sensitive to heat and short wave solar radiation, and require extra protection against direct exposure to high intensity concentrated solar radiation.
  • the principle objective of the present disclosure is to provide an arrangement for protecting the components of a solar concentrator cell assembly from high intensity solar radiations.
  • Another object of the present disclosure is to provide an arrangement for protecting the components of a solar concentrator cell assembly that utilizes an optical or a thermal barrier for preventing high intensity radiation from directly striking the components of the solar concentrator cell assembly.
  • Another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that can be easily be incorporated in the solar concentrator cell assembly or components that are bonded with it, without adversely affecting manufacturability thereof.
  • Another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that maintains effectiveness of the solar concentrator cell assembly.
  • Yet another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that can be incorporated in the solar concentrator cell assembly without substantially increasing manufacturing cost thereof.
  • Still another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that prevents energy losses.
  • One more objective of the present disclosure is to provide a simple arrangement for protecting delicate components configured on a substrate of a solar concentrator cell assembly.
  • an arrangement for protecting components of a solar concentrator cell assembly is characterized by a solar radiation barrier disposed operatively above the assembly, the barrier being provided with an opening circumscribing a solar cell die of the assembly, to guide solar radiations to selectively strike only the solar cell die and shield the other components of the assembly mounted thereon.
  • the solar concentrator cell assembly is provided with a conformal coating.
  • the barrier is a reflecting barrier capable of reflecting solar radiations striking portions of the barrier peripheral to the opening.
  • the barrier is selected from the group consisting of deposited layers, film, foil and mesh and is made up of reflective material selected from the group consisting of silver, aluminium and dielectric thin films.
  • Figure 1 illustrates an exploded view of an assembly that includes an optical element, a conformal coating and a solar concentrator cell assembly that are assembled in accordance with the prior art
  • Figure 2 illustrates an exploded view of an assembly that includes an optical element, a conformal coating and a solar concentrator cell assembly along with an arrangement of a barrier disposed between the optical element and the components of the solar concentrator cell assembly, for protecting the components from high intensity solar radiation in accordance with one embodiment of the present disclosure.
  • the concentrator cell assembly 3 includes a substrate 4, wherein the substrate 4 includes a solar cell die 5 and other components (not specifically shown) including a by-pass diode 6 configured thereon.
  • the by-pass diode 6 is configured on the substrate 4 of a conventional concentrator cell assembly 3, when the conventional concentrator cell assembly 3 is connected in series to other concentrator cell assemblies.
  • the by-pass diode 6 facilitates flow of current through the electrical conductors of the series string comprising multiple concentrator cell assemblies 3, even when the solar cell die 5 of any one concentrator cell assembly 3 in that string has stopped function ng.
  • the concentrator cell assembly 3 is covered by a conformal coating 2 made of silicone or urethane based epoxy resin for protecting the concentrator cell assembly 3 against humidity, corrosion and other detrimental environmental impacts.
  • the silicone or urethane based epoxy resin my also have fillers to reflect a substantial fraction of the solar radiation impinged on it.
  • the conformal coating 2 includes an opening to accommodate and expose the solar cell die 5.
  • the optical element 1 is disposed just above the opening on the conformal coating 2 such that the solar radiations transmitted through the optical element 1 are incident on the solar cell die 5.
  • the optical element 1 is adapted to direct, by refraction or total internal reflection, the solar radiation on-to the solar cell die 5.
  • the optical element 1 is typically a lens.
  • the optical element 1 is generally made from non-solarizing material that does not change color even when exposed to harsh or concentrated solar radiations for long durations. Furthermore, an optical coupler material 7 is used for the dual purpose of locating the optical element at a desired location having a desired orientation and alignment with respect to the solar cell die 5 and for transferring the solar radiation to the cell without further substantial change in its path.
  • Such a configuration of the concentrator cell assembly 3 with respect to the optical element 1 and the conformal coating 2 maximizes exposure of the solar cell die 5 mounted on the substrate 4 to the solar radiations.
  • the solar cell die 5 converts the energy of solar radiations directly into electricity by the photovoltaic effect.
  • the electrical energy generated by the concentrator cell assembly 3 is extracted by means of electrical conductors 8a and 81b connected to the concentrator cell assembly 3.
  • the substrate 4 further includes delicate and temperature sensitive components including the by-pass diode 6.
  • the excess heating of the by-pass , diode 6 may render the by-pass diode 6 in-operational.
  • the conformal coating 2 of the prior art includes fillers for reflecting solar radiations, thereby preventing excess heating of temperature sensitive components mounted on the substrate 4.
  • such an arrangement for protecting delicate components of the concentrator cell assembly 3 from high intensity solar radiations is ineffective and expensive and requires a higher number of operations to be performed during manufacture on this assembly to become functional.
  • FIG. 1 an exploded view of a solar cell assembly 100 including an optical element 12, a transparent conformal coating 14 and a concentrator cell assembly 16 along with a barrier 18 disposed between the optical element 12 and components of the concentrator cell assembly 16 including bypass diode 24 for protecting the components from high intensity solar radiation.
  • the barrier 18 is made of a material that restrains the solar radiations reaching the barrier 18 from getting transmitted there-through.
  • the material is typically a reflective metal including silver, aluminium, dielectric thin films and the like.
  • the barrier is typically in the form of a deposited layer, a film, a foil or a mesh.
  • the concentrator cell assembly 16 includes a substrate 20; the substrate 20 in-turn includes a solar cell die 22 and other components including a by-pass diode 24 soldered thereon.
  • the electrical energy generated by the concentrator cell assembly 16 is extracted by means of electrical conductors 26a and 26b connected to the concentrator cell assembly 16.
  • the barrier 18 is disposed between the optical element 12 and the conformal coating 14.
  • the barrier 18 is provided with an opening to allow solar radiation to reach the solar cell die 22.
  • the barrier 18 is affixed to a bottom surface of the optical element 12 by at least one method including deposition, snap fitting, gluing and the like.
  • the deposition method typically includes Chemical Vapour Deposition (CVD), Physical Vapour Deposition (PVD) or any other purely chemical means.
  • the barrier 18 may be of a made of a material that may exhibit high reflective properties and accordingly reflects solar radiations reaching the barrier 18, thereby restraining the solar radiations from reaching the other side of the barrier layer.
  • the opening of the barrier 18 is so configured that when the optical element 12, the barrier 18, the conformal coating 14 and the concentrator cell assembly 16 are assembled together, the opening of the barrier 18, lies just above the solar cell die 22 and just below the optical element 12, such that the walls of the opening circumscribe the solar cell die 22, while the peripheral . portion of the barrier 18 covers the remaining portion of the substrate 20 on which the components of the concentrator cell assembly 16 including the by-pass diode 24 are mounted thereon. Due to such a configuration, the solar radiations transmitted through the optical element 12 passes through the opening configured on the barrier 18 and strike the solar cell die 5, while the the solar radiations striking the peripheral portion of the barrier 18 covering the remaining portion of the substrate 20 are reflected back into the optical element 12 and dispersed away safely. Accordingly, the delicate components of the concentrator cell assembly 16 including the bypass diode 24 mounted on the remaining portion of the substrate 20 surrounding the solar cell die 5 are protected from high intensity concentrated solar radiation.
  • the aforementioned arrangement is simple and inexpensive and protects the components configured on a substrate of a solar concentrator cell assembly from direct exposure to high intensity solar radiations.

Abstract

An arrangement for protecting components of a solar concentrator cell assembly,from direct exposure to high intensity solar radiations is characterized by a solar radiation barrier disposed operatively above the assembly, the barrier being provided with an opening circumscribing a solar cell die of the assembly to guide solar radiations to selectively strike only the solar cell die and shield the other components of the assembly mounted thereon.

Description

ARRANGEMENT FOR PROTECTING COMPONENTS OF A SOLAR CONCENTRATOR CELL ASSEMBLY
FIELD OF DISCLOSURE
The present invention generally relates to a solar cell assembly.
More particularly, the present invention relates to an arrangement for protecting components of a solar concentrator cell assembly from high intensity solar radiations.
DEFINITIONS
The expression "solar cell die" used hereinafter in this disclosure includes but is not limited to photovoltaic cells, photoelectric cells, multi-junction cells, and devices that convert solar energy into electrical energy/electricity.
The expression "solar cell assembly" used hereinafter in this disclosure includes but is not limited to solar cell ,^ie assembled together with subcomponents including bypass diodes, active devices, interconnects, connectors, and coatings.
BACKGROUND
A solar cell assembly, typically built using a multi-junction photovoltaic cell is a solid state electrical device that converts energy of light, particularly concentrated solar radiations directly into electricity by photovoltaic effect. A conventional concentrator cell assembly of a solar cell assembly includes a suitable solar cell die attached to a substrate. More particularly, the solar cell die is attached to the substrate by means of a first thermal interface that is electrically conducting. The substrate in turn is mounted on a heat conducting plate or heat spreader by means of a second thermal interface material. The substrate may include various other delicate electronic components such as a by-pass diode configured thereon. More specifically, the by-pass diode or other components that extract maximum power from the solar cell die at the same time functioning like a bypass diode if the solar cell die stops generating pre-determined amount of power, is configured on the substrate of the concentrator cell assembly when concentrator cell assemblies are connected in series to each other. The by-pass diode facilitates flow of current through a series string made of multiple concentrator cell assemblies, even when a solar cell of any concentrator cell assembly in the series string has stopped functioning. The concentrator cell assembly is covered by a conformal coat made from silicone or urethane based epoxy resin, and other materials for protecting the concentrator cell assembly against corrosion and other detrimental environmental factors. The conformal coat is configured with an opening to accommodate and expose the solar cell to solar radiation. An optical element is disposed just above the opening on the conformal coat such that the solar radiation transmitted through the optical element strikes the solar cell. More particularly, the optical element is adapted to suitably refract solar radiation on-to the solar cell. Typically, the optical element is a lens.
The optical element is generally made from non-solarizing material that does not change color even when exposed to harsh concentrated solar radiations for long durations. Furthermore, optical coupling materials, including a wide variety of adhesives, are used for locating the optical element at a desired location and alignment with respect to the solar cell. Such a configuration of the solar cell assembly maximizes exposure of the solar cell mounted on the substrate to incoming solar radiations. Due to continuous exposure to concentrated solar radiations the temperature of the substrate rises rapidly. The heating of the substrate along with high intensity solar radiations striking delicate electronic components configured on the substrate may result in heating of the components configured on the substrate and the temperature of the components may reach a temperature that is beyond its operational temperature limit and as a result the components configured on the substrate may stop functioning. Furthermore, short wave radiation, specifically ultra violet (UV) radiation being highly energetic may damage the conformal coat and other materials encapsulating the bypass diode or any other components in the concentrator cell assembly.
In order to maintain the substrate as well as the solar cell, and other components in working condition, the temperature of the substrate along with the solar cell and the components is required to be maintained within permissible operating temperature limits. The exposure to short wave radiation including UV radiation also needs to be reduced. The heat conducting plate or heat spreader or heat sink facilitates removal of heat from the solar cell and the substrate by transferring heat from the solar cell and the substrate to air or a thermal fluid capable of dissipating heat, thereby maintaining the solar cell assembly in working condition. Additionally, arrangements are provided for dissipating excess heat from the substrate and the solar cell, for example, the first thermal interface disposed between the solar cell and the substrate facilitates flow of heat from the solar cell to the substrate and the second thermal interface disposed between the substrate and the heat conducting plate facilitates flow of thermal energy from the substrate to the heat conducting plate. The first thermal interface and the second thermal interface include materials like solder, alumina and boron- nitride that facilitate heat transfer. However, very few effective arrangements are provided for avoiding exposure to concentrated solar radiation on the components configured on the substrate. Further, the components configured on the substrate are sensitive to heat and short wave solar radiation, and require extra protection against direct exposure to high intensity concentrated solar radiation.
Hence, there is a need for an arrangement that protects components configured on a substrate of a concentrator cell assembly from direct exposure to high intensity solar radiation. Furthermore, there is a need for an arrangement for protecting components configured on a substrate of a solar concentrator cell assembly that is simple an inexpensive to incorporate.
OBJECTS
Some of the objects of the present disclosure are aimed to ameliorate one or more problems of the prior art or to at least provide a useful alternative and are listed herein below.
The principle objective of the present disclosure is to provide an arrangement for protecting the components of a solar concentrator cell assembly from high intensity solar radiations. Another object of the present disclosure is to provide an arrangement for protecting the components of a solar concentrator cell assembly that utilizes an optical or a thermal barrier for preventing high intensity radiation from directly striking the components of the solar concentrator cell assembly.
Another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that can be easily be incorporated in the solar concentrator cell assembly or components that are bonded with it, without adversely affecting manufacturability thereof.
Another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that maintains effectiveness of the solar concentrator cell assembly.
Yet another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that can be incorporated in the solar concentrator cell assembly without substantially increasing manufacturing cost thereof.
Still another object of the present disclosure is to provide an arrangement for protecting the components configured on a substrate of a solar concentrator cell assembly that prevents energy losses.
One more objective of the present disclosure is to provide a simple arrangement for protecting delicate components configured on a substrate of a solar concentrator cell assembly. Other objects and advantages of the present disclosure will be more apparent from the following description which is not intended to limit the scope of the present disclosure.
SUMMARY
In accordance with the present disclosure, there is provided an arrangement for protecting components of a solar concentrator cell assembly. The arrangement is characterized by a solar radiation barrier disposed operatively above the assembly, the barrier being provided with an opening circumscribing a solar cell die of the assembly, to guide solar radiations to selectively strike only the solar cell die and shield the other components of the assembly mounted thereon.
Generally, the solar concentrator cell assembly is provided with a conformal coating.
Additionally, the barrier is a reflecting barrier capable of reflecting solar radiations striking portions of the barrier peripheral to the opening.
Preferably, the barrier is selected from the group consisting of deposited layers, film, foil and mesh and is made up of reflective material selected from the group consisting of silver, aluminium and dielectric thin films.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
The arrangement of the present disclosure will now be described with the help of the accompanying drawings, in which: Figure 1 illustrates an exploded view of an assembly that includes an optical element, a conformal coating and a solar concentrator cell assembly that are assembled in accordance with the prior art; and
Figure 2 illustrates an exploded view of an assembly that includes an optical element, a conformal coating and a solar concentrator cell assembly along with an arrangement of a barrier disposed between the optical element and the components of the solar concentrator cell assembly, for protecting the components from high intensity solar radiation in accordance with one embodiment of the present disclosure.
DETAILED DESCRIPTION
The arrangement of the present disclosure will now be described with reference to the embodiment shown in the accompanying drawings. The embodiment does not limit the scope and ambit of the disclosure. The description relates purely to the example and preferred embodiment of the disclosed method and its suggested applications.
The arrangement herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiment in the following description. Descriptions of well-known parameters and processing techniques are omitted so as to not unnecessarily obscure the embodiment herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiment herein may be practiced and to further enable those of skill in the art to practice the embodiment herein. Accordingly, the example should not be construed as limiting the scope of the embodiment herein.
Referring to figure 1, an exploded view of an assembly 10 that includes an optical element 1, a conformal coating 2 and a concentrator cell assembly 3 that are assembled in accordance with the prior art is illustrated. The concentrator cell assembly 3 includes a substrate 4, wherein the substrate 4 includes a solar cell die 5 and other components (not specifically shown) including a by-pass diode 6 configured thereon. The by-pass diode 6 is configured on the substrate 4 of a conventional concentrator cell assembly 3, when the conventional concentrator cell assembly 3 is connected in series to other concentrator cell assemblies. The by-pass diode 6 facilitates flow of current through the electrical conductors of the series string comprising multiple concentrator cell assemblies 3, even when the solar cell die 5 of any one concentrator cell assembly 3 in that string has stopped function ng.
The concentrator cell assembly 3 is covered by a conformal coating 2 made of silicone or urethane based epoxy resin for protecting the concentrator cell assembly 3 against humidity, corrosion and other detrimental environmental impacts. The silicone or urethane based epoxy resin my also have fillers to reflect a substantial fraction of the solar radiation impinged on it. The conformal coating 2 includes an opening to accommodate and expose the solar cell die 5. The optical element 1 is disposed just above the opening on the conformal coating 2 such that the solar radiations transmitted through the optical element 1 are incident on the solar cell die 5. The optical element 1 is adapted to direct, by refraction or total internal reflection, the solar radiation on-to the solar cell die 5. The optical element 1 is typically a lens. The optical element 1 is generally made from non-solarizing material that does not change color even when exposed to harsh or concentrated solar radiations for long durations. Furthermore, an optical coupler material 7 is used for the dual purpose of locating the optical element at a desired location having a desired orientation and alignment with respect to the solar cell die 5 and for transferring the solar radiation to the cell without further substantial change in its path. Such a configuration of the concentrator cell assembly 3 with respect to the optical element 1 and the conformal coating 2 maximizes exposure of the solar cell die 5 mounted on the substrate 4 to the solar radiations. The solar cell die 5 converts the energy of solar radiations directly into electricity by the photovoltaic effect. The electrical energy generated by the concentrator cell assembly 3 is extracted by means of electrical conductors 8a and 81b connected to the concentrator cell assembly 3. The substrate 4 further includes delicate and temperature sensitive components including the by-pass diode 6. The excess heating of the by-pass , diode 6 may render the by-pass diode 6 in-operational. Generally the conformal coating 2 of the prior art includes fillers for reflecting solar radiations, thereby preventing excess heating of temperature sensitive components mounted on the substrate 4. However such an arrangement for protecting delicate components of the concentrator cell assembly 3 from high intensity solar radiations is ineffective and expensive and requires a higher number of operations to be performed during manufacture on this assembly to become functional.
Referring to Figure 2, an exploded view of a solar cell assembly 100 including an optical element 12, a transparent conformal coating 14 and a concentrator cell assembly 16 along with a barrier 18 disposed between the optical element 12 and components of the concentrator cell assembly 16 including bypass diode 24 for protecting the components from high intensity solar radiation.
The barrier 18 is made of a material that restrains the solar radiations reaching the barrier 18 from getting transmitted there-through. The material is typically a reflective metal including silver, aluminium, dielectric thin films and the like. The barrier is typically in the form of a deposited layer, a film, a foil or a mesh. The concentrator cell assembly 16 includes a substrate 20; the substrate 20 in-turn includes a solar cell die 22 and other components including a by-pass diode 24 soldered thereon. The electrical energy generated by the concentrator cell assembly 16 is extracted by means of electrical conductors 26a and 26b connected to the concentrator cell assembly 16. The barrier 18 is disposed between the optical element 12 and the conformal coating 14. The barrier 18 is provided with an opening to allow solar radiation to reach the solar cell die 22. The barrier 18 is affixed to a bottom surface of the optical element 12 by at least one method including deposition, snap fitting, gluing and the like. The deposition method typically includes Chemical Vapour Deposition (CVD), Physical Vapour Deposition (PVD) or any other purely chemical means. The barrier 18 may be of a made of a material that may exhibit high reflective properties and accordingly reflects solar radiations reaching the barrier 18, thereby restraining the solar radiations from reaching the other side of the barrier layer. The opening of the barrier 18 is so configured that when the optical element 12, the barrier 18, the conformal coating 14 and the concentrator cell assembly 16 are assembled together, the opening of the barrier 18, lies just above the solar cell die 22 and just below the optical element 12, such that the walls of the opening circumscribe the solar cell die 22, while the peripheral . portion of the barrier 18 covers the remaining portion of the substrate 20 on which the components of the concentrator cell assembly 16 including the by-pass diode 24 are mounted thereon. Due to such a configuration, the solar radiations transmitted through the optical element 12 passes through the opening configured on the barrier 18 and strike the solar cell die 5, while the the solar radiations striking the peripheral portion of the barrier 18 covering the remaining portion of the substrate 20 are reflected back into the optical element 12 and dispersed away safely. Accordingly, the delicate components of the concentrator cell assembly 16 including the bypass diode 24 mounted on the remaining portion of the substrate 20 surrounding the solar cell die 5 are protected from high intensity concentrated solar radiation.
The aforementioned arrangement is simple and inexpensive and protects the components configured on a substrate of a solar concentrator cell assembly from direct exposure to high intensity solar radiations.
TECHNICAL ADVANTAGES AND ECONOMIC SIGNIFICANCE
The technical advancements offered by the arrangement of the present disclosure include the realization of:
» an arrangement for protecting delicate components of a solar concentrator cell assembly from high intensity solar radiations;
o an arrangement for protecting delicate components of a solar concentrator cell assembly utilizing a barrier for preventing high intensity concentrated radiation from directly striking the delicate components of the concentrator cell assembly;
© an arrangement for protecting delicate components configured on a substrate of a concentrator cell assembly that can be easily incorporated in the concentrator cell assembly Without adversely affecting manufacturability thereof;
® an arrangement for protecting delicate components configured on a substrate of a concentrator cell assembly and at the same time maintaining effectiveness of the concentrator cell assembly;
® an arrangement for protecting delicate components configured on a substrate of a concentrator cell assembly that can be incorporated in the concentrator cell assembly without substantially increasing manufacturing cost thereof;
® an arrangement for protecting delicate components configured on a substrate of a cconcentrator cell assembly that prevents energy losses; and
® an arrangement for protecting delicate components configured on a substrate of a concentrator cell assembly that is a simple arrangement.
Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps. The use of the expression "at least" or "at least one" suggests the use of one or more elements, as the use may be in one of the embodiments to achieve one or more of the desired objects or results.
Any discussion of materials, devices, or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The foregoing description of the specific embodiment will so fully reveal the general nature of the embodiment herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiment without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiment. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiment herein has been described in terms of preferred embodiment, those skilled in the art will recognize that the embodiment herein can be practiced with modification within the spirit and scope of the embodiment as described herein.

Claims

Claims:
1) An arrangement for protecting components of a solar concentrator cell assembly, said arrangement characterized by:
a solar radiation barrier disposed operatively above said assembly, said •barrier being provided with an opening circumscribing a solar cell die of said assembly, said opening adapted to guide solar radiations to selectively strike only the solar cell die and shield the other components of said assembly mounted thereon.
2) The arrangement as claimed in claim 1, wherein the solar concentrator cell assembly is provided with a conformal coating.
3) The arrangement as claimed in claim 1, wherein said barrier is a reflecting barrier adapted to reflect solar radiations striking portions of said barrier peripheral to the opening.
4) The arrangement as claimed in claim 1, wherein said barrier is selected from the group consisting of deposited layers, film, foil and mesh.
5) The arrangement as claimed in claim 1, wherein said barrier is made of a material selected from the group consisting of silver, aluminium and dielectric thin films.
PCT/IN2012/000560 2011-08-23 2012-08-22 Arrangement for protecting components of a solar concentrator cell assembly WO2013105103A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2366MU2011 2011-08-23
IN2366/MUM/2011 2011-08-23

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US20090159128A1 (en) * 2007-12-21 2009-06-25 Gill Shook Leadframe receiver package for solar concentrator
CN101478008A (en) * 2009-01-21 2009-07-08 张德胜 Quasi-blackbody absorbent high-efficient concentration solar cell assembly

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