JP2010165995A - Concentrator photovoltaic module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concentrator photovoltaic module with improves heat dissipation, heat resistance, reliability, and photoelectric conversion efficiency. <P>SOLUTION: The concentrator photovoltaic module 1 includes a receiver substrate 20 whereon a solar battery element 11 for photoelectrically converting solar light Ls condensed by a condensing lens 50 is placed, a heat sink 60 for dissipating thermal energy from the receiver substrate 20, a module plate 70 to which the heat sink 60 is mounted, and a housing frame 80 (side frame 80s and bottom frame 80b) for defining a space region SR formed between the condensing lens 50 and the module plate 70. The module plate 70 is connected to the housing frame 80, and includes an opening 70w for placing elements wherein the solar battery element 11 and the receiver substrate 20 are disposed. The receiver substrate 20 is connected to the heat sink 60. The base 60b of the heat sink is connected to the module plate 70 around the opening 70w for placing elements. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a condensing lens that condenses sunlight, a solar cell that photoelectrically converts the collected sunlight, a heat sink that dissipates heat from the solar cell, a module plate to which the heat sink is attached, The present invention relates to a concentrating solar power generation module including an optical lens and a housing frame that defines a positional relationship between module plates.

  As a solar power generation device, a non-condensing fixed type flat plate structure in which a solar power generation module configured by laying solar cell elements without gaps is installed on a roof or the like is common. On the other hand, a technique for reducing the amount of high-priced solar cell elements among members (parts) constituting the solar power generation apparatus has been proposed.

  In other words, by collecting sunlight using an optical lens or a reflecting mirror, and irradiating the collected sunlight to a small area solar cell element, the generated power per unit area of the solar cell element is increased, It has been proposed to reduce the cost of the solar cell element (that is, the cost of the solar power generation device).

  In general, the photoelectric conversion efficiency of the solar cell element is improved as the concentration factor is increased. However, if the position of the solar cell element is fixed, sunlight often enters as oblique light, and sunlight cannot be used effectively. Therefore, a tracking and concentrating solar power generation device with high condensing magnification configured to track the sun and always receive sunlight in front has been proposed (see, for example, Patent Document 1 to Patent Document 5).

  FIG. 6 is a cross-sectional view showing a schematic configuration of a conventional concentrating solar power generation module applied to a tracking concentrating solar power generation apparatus.

  The conventional concentrating solar power generation module 101 photoelectrically converts the condensing lens 150 (condensing lens panel 150p) that receives and collects sunlight and the sunlight Ls collected by the condensing lens 150. A solar cell 110. The solar cell 110 includes a solar cell element 111 that photoelectrically converts the concentrated sunlight Ls and a receiver substrate 120, and the solar cell element 111 is placed on the receiver substrate 120.

  The receiver substrate 120 is connected to a module plate 170 on which the solar cell 110 is positioned and placed. The module plate 170 forms a housing frame 180 (bottom frame 180b) that constitutes the housing of the concentrating solar power generation module 101. It is connected to.

  The housing frame 180 connects the side frame 180 s disposed opposite to each other so as to support the condenser lens 150 and the opposite side frame 180 s, and the module plate 170 is connected. A bottom frame 180b is provided.

  The receiver substrate 120 is connected to the heat sink 160 (the heat sink base portion 160b and the heat sink fin portion 160f) via the module plate 170. That is, the heat energy of the receiver substrate 120 is radiated from the heat sink fin portion 160f to the outside via the module plate 170 and the heat sink base portion 160b connected to the module plate 170.

  Since the module plate 170 disposed between the receiver substrate 120 and the heat sink 160 needs to improve the thermal conductivity between the receiver substrate 120 and the heat sink 160, an expensive material with high thermal conductivity is applied. For example, it is made of an aluminum alloy. Further, the housing frame 180 (the side frame 180s and the bottom frame 180b) is formed of an iron alloy or the like because it is necessary to ensure strength.

  A wiring pattern connected to the electrode of the solar cell element 111 is formed on the receiver substrate 120, and a wiring member 121 is connected to the wiring pattern. The wiring member 121 connects adjacent solar cell elements 111 to each other, and the concentrating solar power generation module 101 is configured to collect the power generated by the solar cell elements 111 and generate large power. .

  A light guide unit 131 is disposed on the surface of the solar cell element 111, and the condensed sunlight Ls is guided to the solar cell element 111 to protect the surface of the solar cell element 111. A receiver resin sealing portion 27 is formed around the receiver substrate 120 and the light guide portion 131 to protect live parts (such as the wiring member 121) existing on the surface of the receiver substrate 120.

  The bottom frame 180b has a light guide opening 180w through which the concentrated sunlight Ls passes. Therefore, the condensed sunlight Ls passes through the light guide opening 180 w and is irradiated to the solar cell element 111. The thermal energy applied to the solar cell element 111 is radiated from the receiver substrate 120 to the heat sink 160 via the module plate 170.

  However, since the module plate 170 is made of a material having high thermal conductivity, in addition to heat radiation by the heat sink 160, heat conduction by the module plate 170 itself occurs in a direction along the module plate 170 (flat plate direction). Then, heat dissipation to the space region SRf occurs. That is, a phenomenon occurs in which heat energy is accumulated in the space region SRf and the temperature of the space region SRf is increased.

  As the temperature rises in the space region SRf, the resin of the receiver resin sealing portion 127 deteriorates, which may reduce the reliability of the live parts (such as the wiring member 21) on the surface of the receiver substrate 20. In addition, when the resin is applied to the light guide unit 131, the focal point is changed due to deterioration of the resin, so that it is not possible to perform optimum light collection, and there is a possibility that the photoelectric conversion efficiency is lowered and the output is lowered. There is a problem that arises.

  As a countermeasure against such a problem, a convection opening 180h is formed in the bottom frame 80b. That is, the convection openings 180h are arranged at both ends of the bottom frame 80b to generate convection AF, thereby suppressing the temperature rise in the space region SRs.

  However, it is difficult to achieve a sufficient heat dissipation effect only with convection AF, and dust (sand, dust, insects, water, etc.) is generated from the outside due to convection AF generated through the convection opening 180h. In addition, the light guide 131 is contaminated, the wiring member 121 and the receiver resin sealing part 127 are deteriorated due to the thermal shock cycle, and are damaged.

JP 2002-289896 A JP 2002-289897 A JP 2002-289898 A JP 2006-275881 A JP 2007-201109 A

  The thermal energy of sunlight condensed on the solar cell element is efficiently conducted to the outside of the housing frame through the receiver substrate and the heat sink to dissipate the heat, thereby the temperature of the solar cell element and the receiver substrate, the housing Suppresses the temperature of the space area consisting of the frame and module plate, and ensures the reliability of components (solar cell elements, receiver boards, wiring members, etc.) placed in the space area inside the housing frame to dissipate heat An object of the present invention is to provide a concentrating solar power generation module with improved performance, heat resistance, reliability, and photoelectric conversion efficiency.

  A concentrating solar power generation module according to the present invention includes a condensing lens that condenses sunlight, a solar cell element that photoelectrically converts sunlight condensed by the condensing lens, and the solar cell element. A receiver board, a heat sink that dissipates heat from the receiver board, a module plate to which the heat sink is attached, and a housing that defines a space region formed between the condenser lens and the module plate. A concentrating solar power generation module comprising a body frame, wherein the module plate is connected to the housing frame and includes an element arrangement opening in which the solar cell element and the receiver substrate are arranged, The receiver board is connected to the heat sink, and the heat sink is connected to the module plate around the element placement opening. And wherein the are.

  With this configuration, it is possible to dissipate heat by efficiently conducting heat energy from sunlight condensed on the solar cell element to the outside of the housing frame via the receiver substrate and the heat sink. Components that are placed in the space area inside the housing frame (solar cell element, receiver board, wiring member, etc.) that suppress the temperature of the element and the receiver board and the temperature of the space area that is composed of the housing frame and module plate ) To ensure the reliability of heat radiation, heat resistance, reliability, and photoelectric conversion efficiency.

  In the concentrating solar power generation module according to the present invention, the heat sink includes a heat sink base portion having a plane connected to the module plate and the receiver substrate, and fins extended from the heat sink base portion. A product of the thickness of the heat sink base portion and the thermal conductivity of the material constituting the heat sink is the thickness of the module plate and the thermal conductivity of the material constituting the module plate. It is characterized by being larger than the product.

  This configuration makes it possible to increase the heat energy that conducts heat from the receiver board to the heat sink base compared to the heat energy that conducts heat from the receiver board to the module plate. The heat dissipation to the outside can be improved, and the heat resistance and reliability can be improved. In addition, since it is possible to suppress the thickness of the module plate having a large area, the module plate is formed as thin as possible while ensuring the mechanical strength, thereby reducing the cost and weight of the housing frame. It is possible to provide a concentrating solar power generation module that is inexpensive and has good operability.

  In the concentrating solar power generation module according to the present invention, the thermal conductivity of the material constituting the heat sink is larger than the thermal conductivity of the material constituting the module plate.

  This configuration makes it possible to increase the heat energy that conducts heat from the receiver board to the heat sink base compared to the heat energy that conducts heat from the receiver board to the module plate. It is possible to improve heat resistance and reliability.

  In the concentrating solar power generation module according to the present invention, the heat sink is formed of any one of copper, aluminum, and an aluminum alloy, and the module plate is formed of iron or an iron alloy. It is formed.

  With this configuration, it is possible to increase the thermal conductivity of the heat sink compared to the module plate and increase the mechanical strength of the module plate compared to the heat sink, thus ensuring heat dissipation and mechanical strength. It can be set as a concentrating solar power generation module.

  Further, in the concentrating solar power generation module according to the present invention, the housing frame includes a side frame disposed so as to be opposed to support the condensing lens, and a side frame opposed to each other. And a bottom frame connected to the module plate, the bottom frame including a light guide opening that guides sunlight through the light collected by the condenser lens. .

  With this configuration, it becomes possible to function the bottom frame as a light shielding plate that shields the receiver substrate from the collected sunlight, so if tracking deviation occurs in the sunlight tracking state and the condensed spot shifts, It is possible to prevent the live spot (such as the wiring member) on the receiver substrate from being irradiated with the focused spot, prevent damage, and ensure reliability. In addition, the thermal energy conducted from the receiver substrate to the space area between the condenser lens and the bottom frame can be suppressed, so the temperature of the condenser lens is maintained at a temperature close to the outside air temperature. A decrease in light collection efficiency due to a change in the refractive index of the light collecting lens can be suppressed, and a decrease in output can be prevented.

  In the concentrating solar power generation module according to the present invention, the bottom frame is formed of iron or an iron alloy as a material.

  With this configuration, the mechanical strength of the bottom frame can be secured, and the thermal energy that is thermally conducted from the receiver substrate to the space region between the condenser lens and the bottom frame can be reliably suppressed. The characteristics of the condensing lens can be secured and the reliability and condensing efficiency can be maintained.

  Moreover, the concentrating solar power generation module according to the present invention includes a heat conductive sheet inserted between the receiver substrate and the heat sink.

  With this configuration, it is possible to improve the adhesion between the receiver board and the heat sink to efficiently generate heat conduction from the receiver board to the heat sink, and to efficiently dissipate heat with reduced thermal resistance in the heat conduction path. Can be realized.

  Moreover, the concentrating solar power generation module according to the present invention includes a heat insulating sheet inserted between the heat sink and the module plate.

  With this configuration, it is possible to prevent heat conduction from the receiver board to the module plate via the heat sink. Therefore, the heat dissipation effect by the heat sink is further improved, and heat conduction to the module plate is prevented. The temperature rise in the space region between the lens and the condenser lens can be more reliably suppressed.

  According to the concentrating solar power generation module according to the present invention, a condensing lens that condenses sunlight, a solar cell element that photoelectrically converts sunlight collected by the condensing lens, and the solar cell element A receiver substrate on which is mounted, a heat sink that dissipates heat from the receiver substrate, a module plate to which the heat sink is attached, and a space region defined between the condenser lens and the module plate A concentrating solar power generation module including a housing frame, wherein the module plate is connected to the housing frame and includes an element arrangement opening in which the solar cell element and the receiver substrate are arranged. The receiver substrate is connected to the heat sink, and the heat sink is attached to the module plate around the element placement opening. As a result, it is possible to dissipate heat by efficiently conducting heat energy from sunlight collected on the solar cell element to the outside of the housing frame via the receiver substrate and the heat sink. Components that are placed in the space area inside the housing frame (solar cell element, receiver board, wiring member, etc.) that suppress the temperature of the element and the receiver board and the temperature of the space area that is composed of the housing frame and module plate ) To ensure the reliability of heat radiation, heat resistance, reliability, and photoelectric conversion efficiency.

It is sectional drawing which expands and shows the principal part structure of the concentrating solar power generation module which concerns on Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the concentrating solar power generation module which concerns on Embodiment 1 of this invention. It is explanatory drawing explaining the effect of the concentrating solar power generation module which concerns on Embodiment 1 of this invention, (A) is a conceptual diagram which shows the heat conduction path | route in a prior art, (B) is Embodiment 1. FIG. It is a conceptual diagram which shows the heat conduction path | route in the concentrating photovoltaic power generation module which concerns on. It is explanatory drawing which expands and demonstrates the principal part structure of the concentrating solar power generation module which concerns on Embodiment 2 of this invention, (A) is sectional drawing of a principal part structure, (B) is a heat dissipation aspect. It is an equivalent circuit diagram of the thermal resistance for demonstrating. It is sectional drawing which shows schematic structure of the concentrating solar power generation module which concerns on Embodiment 3 of this invention. It is sectional drawing which shows schematic structure of the conventional concentrating solar power generation module applied to a tracking concentrating solar power generation device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
Based on FIG. 1 thru | or FIG. 3, the concentrating solar power generation module which concerns on this Embodiment is demonstrated.

  FIG. 1 is an enlarged cross-sectional view showing the main configuration of a concentrating solar power generation module according to Embodiment 1 of the present invention.

  FIG. 2 is a cross-sectional view showing a schematic configuration of the concentrating solar power generation module according to Embodiment 1 of the present invention.

  The concentrating solar power generation module 1 according to the present embodiment includes a condensing lens 50 that condenses sunlight, a solar cell element 11 that photoelectrically converts sunlight Ls collected by the condensing lens 50, and Between the receiver substrate 20 on which the solar cell element 11 is placed, the heat sink 60 that dissipates heat energy from the receiver substrate 20, the module plate 70 to which the heat sink 60 is attached, and between the condenser lens 50 and the module plate 70. And a housing frame 80 (side frame 80s, bottom frame 80b) that demarcates the spatial region SR.

  The module plate 70 is connected to the housing frame 80 and includes an element arrangement opening 70w in which the solar cell element 11 and the receiver substrate 20 are arranged. The receiver substrate 20 is connected to the heat sink 60 (heat sink base portion 60b), and the heat sink 60 (heat sink base portion 60b) is connected to the module plate 70 around the element placement opening 70w.

  Therefore, it is possible to dissipate heat by efficiently conducting heat energy from the sunlight Ls collected on the solar cell element 11 to the outside of the housing frame 80 via the receiver substrate 20 and the heat sink 60. , The temperature of the solar cell element 11 and the receiver substrate 20, the temperature of the space region SR formed by the housing frame 80 and the module plate 70, and the components (in the space region SR inside the housing frame 80) Solar cell element 11, receiver substrate 20, wiring member 21, etc.) can be ensured to provide concentrating solar power generation module 1 with improved heat dissipation, heat resistance, reliability, and photoelectric conversion efficiency. .

  Note that the solar cell element 11 and the receiver substrate 20 constitute the solar cell 10. For example, five solar cells 10 are arranged on the module plate 70. Further, a plurality of condensing lenses 50 arranged corresponding to each solar cell 10 are formed as a single unit, and constitute a condensing lens panel 50 p corresponding to the module plate 70.

  The space region SR is composed of a space region SRf and a space region SRs. The space region SRf is a space configured between the module plate 70 and the housing frame 80 (bottom frame 80b), and the space region SRs is the housing frame 80 (bottom frame 80b) and the condenser lens panel 50p ( It is a space formed between the condenser lens 50). When it is not necessary to distinguish between the space region SRf and the space region SRs, the space region SR is simply used.

  The receiver substrate 20 is fastened to the heat sink 60 (heat sink base portion 60b) by a fastening member (not shown) such as a rivet. The heat sink 60 is fastened to the module plate 70 by a fastening member (not shown) such as a rivet. The module plate 70 is fastened to the housing frame 80 (bottom frame 80b) by fastening members (not shown) such as rivets.

  The module plate 70 is formed with an element arrangement opening 70w corresponding to each of the solar cells 10, and the solar cell 10 (solar cell element 11, receiver substrate 20) is arranged in the corresponding element arrangement opening 70w. Yes. The receiver substrate 20 is fastened to the module plate 70 around the element placement opening 70w.

  The light guide member 30 is arranged on the side corresponding to the solar cell element 11 of the solar cell 10, and the solar cell element 11 is effectively irradiated with the sunlight Ls collected by the condenser lens 50. . Further, the periphery of the solar cell 10 (solar cell element 11) arranged in the element arrangement opening 70w is covered with the receiver resin sealing portion 27, and the solar cell element 11 and the receiver substrate 20 (the wiring member 21 and the like are activated). The electrical component) is protected from the external environment to ensure reliability.

  A wiring pattern (not shown) connected to the electrode (not shown) of the solar cell element 11 is formed on the receiver substrate 20, and a wiring member 21 is connected to the wiring pattern. The wiring member 21 connects the adjacent solar cell elements 11 to each other, and the concentrating solar power generation module 1 can collect the electric power generated in the solar cell elements 11 to obtain a large electric power. Become. In addition, the wiring member 21 can be comprised, for example with a heat resistant wiring cable.

  The housing frame 80 connects the side frame 80s disposed opposite to support the condenser lens 50 (the condenser lens panel 50p) and the opposite side frame 80s to each other, and the module plate 70 is coupled to the housing frame 80. The bottom frame 80b includes a light guide opening 80w through which sunlight Ls collected by the condenser lens 50 is guided.

  Accordingly, the bottom frame 80b can function as a light-shielding plate that shields the receiver substrate 20 from the concentrated sunlight Ls. Therefore, when a tracking shift occurs in the sunlight tracking state and the focused spot is shifted. In addition, it is possible to prevent the live spots (such as the wiring member 21) on the receiver substrate 20 from being irradiated with the focused spot, thereby preventing damage and ensuring reliability.

  That is, the center of the condensing lens 50, the light guide opening 80w, and the solar cell element 11 are positioned with high accuracy via the module plate 70 and the housing frame 80 (the bottom frame 80b and the side frame 80s). . Further, the light guide member 30 is disposed in the light guide opening 80w.

  Further, it is possible to suppress the thermal energy that is thermally conducted from the receiver substrate 20 to the space region SRs between the condenser lens 50 (the condenser lens panel 50p) and the bottom frame 80b. Is maintained at a temperature close to the outside air temperature, a decrease in the light collection efficiency due to a change in the refractive index of the condenser lens 50 can be suppressed, and a reduction in output can be prevented.

  The concentrating solar power generation module 1 includes a heat conductive sheet 61 inserted between the receiver substrate 20 and the heat sink 60. Accordingly, it is possible to improve the adhesion between the receiver substrate 20 and the heat sink 60 to efficiently generate heat conduction from the receiver substrate 20 to the heat sink 60, and from the receiver substrate 20 to the heat sink 60 (heat sink base portion 60b). Thus, it is possible to achieve efficient heat dissipation while suppressing thermal resistance in the heat conduction path.

  The heat conductive sheet 61 is composed of, for example, a silicone resin heat conductive sheet containing a ceramic filler or an acrylic heat conductive sheet containing a heat conductive filler, and the heat conductivity is 4 to 5 W / (m · K) degree.

  The heat sink 60 includes a heat sink base portion 60b having a plane connected to the module plate 70 and the receiver substrate 20, and a heat sink fin portion 60f having fins extended from the heat sink base portion 60b, and the heat sink base portion 60b. It is desirable that the product of the thickness Thb and the thermal conductivity of the material constituting the heat sink 60 be larger than the product of the thickness Tmp of the module plate 70 and the thermal conductivity of the material constituting the module plate 70.

  That is, since the heat energy conducted from the receiver substrate 20 to the heat sink base portion 60b can be increased as compared with the heat energy conducted from the receiver substrate 20 to the module plate 70, the heat sink 60 can be effectively acted to improve heat dissipation to the outside, and heat resistance and reliability can be improved.

  In addition, since it is possible to suppress the thickness of the module plate 70 having a large area, the module plate 70 is formed as thin as possible in a state in which the mechanical strength is ensured, so that the cost and weight of the housing frame 80 are reduced. Thus, the concentrating solar power generation module 1 can be obtained at low cost and with good operability.

  The thermal conductivity of the material constituting the heat sink 60 is desirably larger than the thermal conductivity of the material constituting the module plate 70.

  That is, compared to the heat energy conducted from the receiver substrate 20 toward the module plate 70, it is possible to increase the heat energy conducted from the receiver substrate 20 toward the heat sink base portion 60b. The heat resistance and the reliability can be improved.

  The heat sink 60 is preferably made of any one of copper, aluminum, and aluminum alloy, and the module plate 70 is preferably made of iron or an iron alloy.

  That is, the heat conductivity of the heat sink 60 can be increased compared to the module plate 70, and the mechanical strength of the module plate 70 can be increased compared to the heat sink 60. The secured concentrating solar power generation module 1 can be obtained.

  In the present embodiment, the heat sink 60 is formed of, for example, an aluminum alloy. The thermal conductivity of an aluminum alloy varies somewhat depending on the metal added to the aluminum, but is generally about 200 W / (m · K). Further, among aluminum alloys, the thermal conductivity of A6063 alloy (JIS alloy name, mainly composed of Al—Si—Mg), which is generally used as an aluminum alloy extrusion material, is about 210 W / (m · K). is there. Note that the shape and size of the heat sink base portion 60b and the heat sink fin portion 60f are optimized to suppress heat resistance and improve heat dissipation efficiency.

The module plate 70 is made of an iron alloy (steel plate), for example, and has a shape obtained by drawing a thin plate having a thickness Tmp = 0.8 mm to give rigidity. The thermal conductivity of the steel plate in the present embodiment is about 50 W / (m · K). Therefore, thickness Tmp × thermal conductivity = 0.8 × 50 mm · W / (m · K) = 40 × 10 ⁻³ (W / K).

On the other hand, the heat sink base portion 60b is, for example, an aluminum alloy and has a thermal conductivity of 200 W / (m · K), and if the thickness Thb = 4 mm, the thickness Thb × thermal conductivity = 4 × 200 (mm · W) / (m · K) = 800 × 10 ⁻³ (W / K).

  That is, as described above, the product of the thickness Thb of the heat sink base portion 60b and the thermal conductivity of the material constituting the heat sink 60 is the thickness Tmp of the module plate 70 and the thermal conductivity of the material constituting the module plate 70. It is possible to make it larger than the product of

  The bottom frame 80b is preferably formed using iron or an iron alloy as a material. That is, it is possible to secure the mechanical strength of the bottom frame 80b and to surely suppress the thermal energy that is thermally conducted from the receiver substrate 20 to the space region SRs between the condenser lens 50 and the bottom frame 80b. Therefore, the characteristics of the condenser lens 50 can be maintained and the reliability and the light collection efficiency can be maintained.

  In addition, the concentrating solar power generation module 1 according to the present embodiment can be operated as a tracking concentrating solar power generation device by being attached to a tracking drive mechanism that tracks sunlight.

  FIG. 3 is an explanatory diagram for explaining the effect of the concentrating solar power generation module according to Embodiment 1 of the present invention, in which (A) is a conceptual diagram showing a heat conduction path in the prior art, and (B) is 3 is a conceptual diagram illustrating a heat conduction path in the concentrating solar power generation module according to Embodiment 1. FIG.

  In the concentrating solar power generation module 101 (FIG. 3A) according to the conventional technique, the receiver substrate 120 on which the solar cell element 111 is placed is connected to the heat sink 160 via the module plate 170. Further, in order to effectively conduct heat energy from the receiver substrate 120 to the heat sink 160, an aluminum alloy having high thermal conductivity is applied to the module plate 170 as with the heat sink 160.

  Accordingly, the heat energy from the receiver substrate 120 generates heat through the heat conduction path HFs in the module plate 170 in the same manner as heat radiation through the heat conduction path HFf in the heat sink 160. A slight heat conduction path HFt from the receiver resin sealing portion 127 to the space region SRf is also generated.

  That is, in the prior art, the heat energy from the receiver substrate 120 is dissipated to the space region SRf via the module plate 170 and causes the temperature of the space region SRf to rise, so that the heat dissipation effect on the solar cell 110 is achieved. Could not get enough.

  In order to generate convection in the space region SRf, the convection opening 180 (FIG. 6) is provided in the conventional technique (FIG. 6). However, dust (from the outside through the convection opening 180 is provided. Sand, dust, insects, water, etc.), and the light guide member 130 is contaminated, and the wiring member 121 and the receiver resin sealing portion 127 are deteriorated and damaged due to the thermal shock cycle. It was.

  In the concentrating solar power generation module 1 (FIG. 3B) according to the present embodiment, the heat sink 60 to which the receiver substrate 20 is fastened has a plane that is coupled to face the module plate 70 and the receiver substrate 20. Since the heat sink base portion 60b and the heat sink fin portion 60f having fins extended from the heat sink base portion 60b are provided, the heat conduction path HFf that conducts heat energy from the receiver substrate 20 and dissipates it to the outside is configured. To do.

  On the other hand, since the heat sink 60 is connected to the module plate 70, there is heat conduction from the heat sink 60 to the module plate 70, and the module plate 70 constitutes a heat conduction path HFs.

  However, the thermal conductivity of the heat sink 60 (for example, 200 W / (m · K) for an aluminum alloy) is larger than the thermal conductivity of the module plate 70 (for example, 50 W / (m · K) for an iron alloy). It is.

  Further, by setting the product of the thickness Thb of the heat sink base portion 60b and the thermal conductivity to be larger than the product of the thickness Tmp of the module plate 70 and the thermal conductivity, the thermal conduction in the thermal conduction path HFf is increased. It is possible to increase the heat conduction in the heat conduction path HFs.

  That is, the heat energy from the receiver board 20 can be reliably radiated to the outside by the heat sink 60, and the heat conduction from the receiver board 20 to the module plate 70 can be suppressed, so that the temperature rise in the space region SRs can be prevented. , To prevent the influence of thermal energy due to sunlight Ls on the components (solar cell 10, wiring member 21, etc.) arranged in the space region SRs, to ensure reliability, heat dissipation, heat resistance, photoelectric conversion efficiency The improved concentrating solar power generation module 1 can be obtained.

  Further, since the heat conduction sheet 61 inserted between the receiver substrate 20 and the heat sink 60 is provided, the heat energy from the receiver substrate 20 is efficiently conducted to the heat sink 60, so that the receiver resin sealing portion 27. Heat dissipation from the heat conduction path HFt to the space region SRs is also suppressed, and the temperature rise in the space region SRs can be reliably reduced.

  According to the present embodiment, it is possible to reliably prevent a temperature rise in the space region SRs (space region SR), so that it is not necessary to carry air convection in the space region SRs, and the module plate 70 It is possible to seal the space region SRs constituted by the bottom frame 80b. That is, the spatial region SRs is completely shielded from other regions except for the light guide opening 80w.

  Therefore, dust (sand, dust, insects, water, etc.) is prevented from entering from the outside, the light guide member 30 is contaminated, and the wiring member 21 and the receiver resin sealing portion 27 are deteriorated due to the thermal shock cycle. Thus, damage can be prevented and the highly reliable concentrating solar power generation module 1 can be obtained.

The space region SRs is sealed, and the bottom frame 80b can be used with a material having a lower thermal conductivity than the module plate 70 (for example, an iron alloy with respect to the aluminum alloy of the module plate 70).
Further, as described above, in the concentrating solar power generation module 1 according to the present embodiment, a material having a lower thermal conductivity than the heat sink 60 can be applied as the module plate 70. Therefore, it is not necessary to use an expensive material having a high thermal conductivity, and an inexpensive material having a low thermal conductivity can be used. Can be manufactured at low cost.

<Embodiment 2>
Based on FIG. 4, the concentrating solar power generation module according to the present embodiment will be described.

  FIG. 4 is an explanatory diagram for explaining the configuration of the main part of the concentrating solar power generation module according to Embodiment 2 of the present invention in an enlarged manner, (A) is a cross-sectional view of the main configuration, ) Is an equivalent circuit diagram of thermal resistance for explaining a heat radiation mode.

  The basic configuration of the concentrating solar power generation module 1 according to the present embodiment is the same as that of the concentrating solar power generation module 1 according to the first embodiment. explain.

  The concentrating solar power generation module 1 according to the present embodiment includes a heat insulating sheet 67 inserted between the heat sink 60 and the module plate 70.

  Therefore, the equivalent circuit of the thermal resistance in the concentrating solar power generation module 1 is the heat resistance Rh20 of the receiver substrate 20 connected to the solar cell element 11 and the heat disposed between the receiver substrate 20 and the heat sink 60. The heat resistance Rh61 of the conductive sheet 61, the heat resistance Rh60 of the heat sink 60 arranged in the direction of the heat conduction path HFf with respect to the heat conduction sheet 61, and the heat insulating sheet 67 arranged in the direction of the heat conduction path HFs with respect to the heat sink 60 The thermal resistance Rh67 of the module plate 70 and the thermal resistance Rh70 of the module plate 70 in contact with the heat insulating sheet 67 are provided as main thermal resistances.

  The heat resistance Rh61 of the heat conductive sheet 61 is obtained by (thickness Tcs of the heat conductive sheet 61) / ((heat conductivity of the heat conductive sheet 61) × (area of the heat conductive sheet 61)). The thermal resistance Rh67 of 67 is obtained by (thickness Tss of the heat insulating sheet 67) / ((thermal conductivity of the heat insulating sheet 67) × (area of the heat insulating sheet 61)).

  In the present embodiment, the heat conduction (heat conduction path HFs) from the receiver substrate 20 to the module plate 70 via the heat sink 60 can be prevented by the heat insulating sheet 67, so that the heat radiation effect (heat Heat dissipation by the conduction path HFf) is further improved, heat conduction to the module plate 70 via the heat conduction path HFs is prevented, and the space region SR (the space region SRf and the space region SRf between the module plate 70 and the condenser lens 50 is prevented. The temperature rise in the space region SRs) can be suppressed.

  In order to realize the above-described effect of the heat insulating sheet 67, specifically, the following configuration is possible.

  In the concentrating solar power generation module 1 according to the present embodiment, the heat resistance Rh67 of the heat insulating sheet 67 is larger than the heat resistance Rh61 of the heat conductive sheet 61 and larger than the heat resistance Rh60 of the heat sink 60.

  With this configuration, heat insulation between the heat sink 60 and the module plate 70 can be reliably realized, and heat conduction to the module plate 70 is prevented and heat dissipation by the heat sink 60 is promoted. And the temperature rise of the space region SR between the condenser lens 50 can be reliably suppressed.

  Since the heat resistance Rh67 can suppress the heat radiation in the heat conduction path HFs, the heat insulation between the heat sink 60 and the module plate 70 is realized, and the space between the module plate 70 and the condenser lens 50 is realized. An increase in temperature of region SR can be reliably suppressed.

  When the planar shape and material are specified, the thermal resistance Rh61 can be adjusted by the thickness Tcs of the heat conductive sheet 61, and the thermal resistance Rh67 is adjusted by the thickness Tss of the heat insulating sheet 67. Is possible.

  The heat insulating sheet 67 has a thermal conductivity of 1 W / (m · K) or less. That is, by suppressing the thermal conductivity to 1 W / (m · K) or less, it is possible to reliably realize the heat insulation between the heat sink 60 and the module plate 70.

  That is, even when the thickness Tcs of the heat conductive sheet 61 and the thickness Tss of the heat insulating sheet 67 are, for example, approximately the same and the respective areas are approximately the same, the thermal resistance Rh67 is easily increased as compared with the thermal resistance Rh61. can do.

  Therefore, it is not necessary to extremely increase the thickness Tss of the heat insulating sheet 67, and the heat sink 60 can be reliably connected to the module plate 70.

  With this configuration, heat conduction from the receiver substrate 20 to the module plate 70 is prevented and heat dissipation by the heat sink 60 is promoted, so that the temperature increase in the space region SR between the module plate 70 and the condenser lens 50 is more reliably performed. Can be suppressed.

  For example, the thermal conductivity of PET (polyethylene terephthalate) is about 0.2 W / (m · K), which is sufficient as compared with the thermal conductivity of the thermal conductive sheet 61 (about 4 to 5 W / (m · K)). Small value. Therefore, it is possible to use PET as the material of the heat insulating sheet 67, and in this embodiment, the heat insulating sheet 67 can be composed of, for example, a PET film having a thickness of about 0.5 mm. It is.

  In addition, although the relationship between the heat conductive sheet 61 and the heat insulation sheet 67 was prescribed | regulated by the thermal resistance and the heat conductivity, it is possible to adjust the effect | action of the heat insulation sheet 67 also by other conditions. Below, the conditions for generating the effect | action by the heat insulation sheet 67 effectively are shown.

  As described above, the thermal resistance Rh67 of the heat insulating sheet 67 varies depending on the thickness Tss of the heat insulating sheet 67. Further, the thermal resistance Rh61 of the heat conductive sheet 61 varies depending on the thickness Tcs of the heat conductive sheet 61. That is, even if the material has a low thermal conductivity and a heat insulating property, if the thickness is small, the thermal resistance is low.

Therefore, “thickness (m) / thermal conductivity (W / (m · K))” (unit: K · m ² / W) is applied as an index representing good heat insulation (magnification of thermal resistance). Is possible.

  In the present embodiment, the value obtained by dividing the thickness Tss of the heat insulating sheet 67 by the thermal conductivity of the heat insulating sheet 67 is larger than the value obtained by dividing the thickness Tcs of the heat conductive sheet 61 by the thermal conductivity of the heat conductive sheet 61. As a configuration.

  With this configuration, it is possible to easily ensure the heat insulating property of the heat insulating sheet 67 against the heat conduction to the heat sink 60 by the heat conductive sheet 61. Therefore, the heat insulating property between the heat sink 60 and the module plate 70 can be improved. This can be easily realized and the temperature increase in the space region SR between the module plate 70 and the condenser lens 50 can be suppressed with high accuracy.

  That is, heat radiation (heat conduction path HFs) to the module plate 70 can be prevented and heat radiation (heat conduction path HFf) by the heat sink 60 can be dominant, and the space between the module plate 70 and the condenser lens 50 can be controlled. The temperature rise in region SR can be easily suppressed.

For example, when the direct light is 850 (W / m ² ), the planar shape of the condenser lens 50 is 170 mm (0.17 m) square, and the loss factor due to reflection loss is 0.85, The energy of the irradiated sunlight Ls is 850 (W / m ² ) × 0.17 × 0.17 (m ² ) × 0.85 = 21 (W).

  If approximately 6 (W) is generated by photoelectric conversion by the solar cell element 11 (solar cell 10), 21W−6W = 15W is converted into heat.

  As described above, in order to effectively generate the action of the heat insulating sheet 67, it is necessary that the heat resistance Rh67 of the heat insulating sheet 67 is larger than the heat resistance Rh60 of the heat sink 60 (heat sink fin portion 60f). That is, in this state, the heat dissipation effect by the heat sink 60 becomes largely dominant, and the heat conduction path HFf effectively conducts heat compared to the heat conduction path HFs, and the temperature rise in the space region SR is suppressed. be able to.

  When heat radiation in the heat conduction path HFf through the receiver substrate 20, the heat conduction sheet 61, and the heat sink 60 is dominant, the converted 15 W heat is radiated in the heat conduction path HFf (heat sink 60). If the heat resistance Rh60 of the heat sink 60 is 2 K / W, for example, the temperature rise ΔT at the heat sink 60 is 2 (K / W) × 15 (W) = 30 (K) = 30 ° C.

  For example, assuming that the outside air temperature is 30 ° C. and the thermal resistance (thermal resistance Rh20 + thermal resistance Rh61) between the solar cell element 11 and the heat sink 60 is 1 K / W, between the solar cell element 11 and the outside air Amb The thermal resistance at is thermal resistance Rh20 + thermal resistance Rh61 + thermal resistance Rh60 = (1 + 2) (K / W) = 3 (K / W). Therefore, the temperature of the solar cell element 11 is 3 (K / W) × 15 W = 45 K (45 ° C.) higher than the outside air temperature of 30 ° C. That is, the temperature of the solar cell element 11 can be suppressed to 75 ° C.

  Therefore, when the thermal resistance Rh60 of the heat sink 60 is, for example, 2 K / W described above, the thermal resistance Rh67 needs to be 2 K / W or more.

If the area of the heat insulating sheet 67 applied to the heat sink 60 with the thermal resistance Rh60 = 2K / W is, for example, S = 0.005 m ² , the thermal resistance Rh67 = (thickness Tss of the heat insulating sheet 67) / ((heat insulation Thermal conductivity of sheet 67) × (area of heat insulation sheet 61)) = Tss / ((thermal conductivity of heat insulation sheet 67) × 0.0025) ≧ 2 (K / W), that is, Tss / ((heat insulation sheet 67 thermal conductivity) ≧ 0.0025 × 2 (K · m ² /W)=0.005 (K · m ² / W).

Therefore, in this Embodiment, the value which remove | divided thickness Tss of the heat insulation sheet 67 by the heat conductivity of the heat insulation sheet 67 is set as the structure larger than 0.005 (K * m < ² > / W). With this configuration, the heat insulating property of the heat insulating sheet 67 can be easily ensured, so that the heat insulating property between the heat sink 60 and the module plate 70 can be easily ensured.

For example, when the thermal conductivity of the heat insulating sheet 67 is 0.1 K / W and the thickness Tss = 1 mm, the value obtained by dividing the thickness Tss by the thermal conductivity is 1 × 10 ⁻³ /0.1=0. ^{.01 (K · m 2 /W)≧0.005(K ·} m 2 / W) , and the can satisfy the above conditions. Further, when the thermal conductivity = 1 K / W and the thickness Tss = 10 mm, the value obtained by dividing the thickness Tss by the thermal conductivity is 10 × 10 ⁻³ /1=0.01 (K · m ² / W). ) ≧ 0.005 (K · m ² / W), which satisfies the above-described conditions.

<Embodiment 3>
Based on FIG. 5, the concentrating solar power generation module according to the present embodiment will be described.

  FIG. 5 is a cross-sectional view showing a schematic configuration of the concentrating solar power generation module according to Embodiment 3 of the present invention.

  The basic configuration of the concentrating solar power generation module 1 according to the present embodiment is the same as that of the concentrating solar power generation module 1 according to the first embodiment and the second embodiment. The main differences will be explained. In FIG. 5, a part of the configuration is simplified, and the solar cell element 11 and the receiver substrate 20 are shown as the solar cell 10.

  The concentrating solar power generation module 1 according to the present embodiment has a structure of the housing frame 80 by removing the bottom frame 80b included in the concentrating solar power generation module 1 according to the first and second embodiments. Is simplified.

  Therefore, it is possible to reduce the case cost when manufacturing the case frame 80, reduce the weight of the case frame 80, and simplify the assembly process of the case frame 80 and the module plate 70. The optical solar power generation module 1 can be manufactured at low cost with good workability.

  As described above, the concentrating solar power generation module 1 according to the present embodiment includes a condensing lens 50 that condenses sunlight, and a solar cell that photoelectrically converts sunlight Ls collected by the condensing lens 50. Element 11, receiver substrate 20 on which solar cell element 11 is placed, heat sink 60 that dissipates heat energy from receiver substrate 20, module plate 70 to which heat sink 60 is attached, condenser lens 50, and module plate And a housing frame 80 (side frame 80 s) that defines a spatial region SR formed between the housing 70 and the space 70.

  The module plate 70 is connected to the housing frame 80 (side frame 80s) and includes an element arrangement opening 70w in which the solar cell element 11 and the receiver substrate 20 are arranged. The receiver substrate 20 is connected to the heat sink 60. The heat sink 60 is connected to the module plate 70 around the element placement opening 70w.

  Therefore, it is possible to dissipate heat by conducting heat energy from sunlight Ls collected on the solar cell element 11 to the outside of the housing frame 80 via the receiver substrate 20 and the heat sink 60. The components (solar cell elements) arranged in the space region SR inside the housing frame 80 by suppressing the temperature of the element 11 and the receiver substrate 20 and the temperature of the space region SR composed of the housing frame 80 and the module plate 70 11, the receiver substrate 20, the wiring member 21, etc.) can be secured, and the concentrating solar power generation module 1 can be obtained with improved heat dissipation, heat resistance, reliability, and photoelectric conversion efficiency.

  In addition, in the concentrating solar power generation module 1 according to the present embodiment, the heat insulating sheet 67 described in the second embodiment can be provided and can be operated in the same manner as in the second embodiment. Since other configurations and operations are the same as those in the first and second embodiments, the description thereof will be omitted.

DESCRIPTION OF SYMBOLS 1 Condensing type photovoltaic power generation module 10 Solar cell 11 Solar cell element 20 Receiver board | substrate 21 Wiring member 27 Receiver resin sealing part 30 Light guide member 50 Condensing lens 50p Condensing lens panel 60 Heat sink 60b Heat sink base part 60f Heat sink fin part 61 Heat conduction sheet 67 Heat insulation sheet 70 Module plate 70w Element arrangement opening 80 Housing frame 80b Bottom frame 80s Side frame 80w Light guide opening Amb Outside air HFf, HFs, HFt Heat conduction path Rh20, Rh60, Rh67, Rh70 Thermal resistance SR, SRf, SRs Spatial region Tcs, Thb, Tmp, Tss Thickness Ls Sunlight

Claims (8)

A condensing lens that condenses sunlight, a solar cell element that photoelectrically converts sunlight condensed by the condensing lens, a receiver substrate on which the solar cell element is mounted, and heat from the receiver substrate A concentrating solar power generation module comprising: a heat sink that dissipates heat; a module plate to which the heat sink is attached; and a housing frame that defines a spatial region formed between the condensing lens and the module plate. There,
The module plate is connected to the housing frame, and includes an element arrangement opening in which the solar cell element and the receiver substrate are arranged.
The concentrating solar power generation module, wherein the receiver substrate is connected to the heat sink, and the heat sink is connected to the module plate around the element arrangement opening. The concentrating solar power generation module according to claim 1,
The heat sink includes a heat sink base portion having a plane connected to the module plate and the receiver substrate, and a heat sink fin portion having fins extended from the heat sink base portion,
The product of the thickness of the heat sink base portion and the thermal conductivity of the material constituting the heat sink is greater than the product of the thickness of the module plate and the thermal conductivity of the material constituting the module plate. Optical photovoltaic module. The concentrating solar power generation module according to claim 1 or 2,
The concentrating solar power generation module, wherein a heat conductivity of a material constituting the heat sink is larger than a heat conductivity of a material constituting the module plate. The concentrating solar power generation module according to any one of claims 1 to 3,
The heat sink is formed of any one of copper, aluminum, and an aluminum alloy, and the module plate is formed of iron or an iron alloy as a material. module. The concentrating solar power generation module according to any one of claims 1 to 4,
The housing frame includes a side frame disposed so as to support the condenser lens, and a bottom frame connected to the opposing side frames and connected to the module plate.
The bottom frame includes a light guide opening for guiding the sunlight collected by the condensing lens to pass therethrough. The concentrating solar power generation module according to claim 5,
The concentrating solar power generation module, wherein the bottom frame is made of iron or an iron alloy. The concentrating solar power generation module according to any one of claims 1 to 6,
A concentrating solar power generation module comprising a heat conductive sheet inserted between the receiver substrate and the heat sink. The concentrating solar power generation module according to any one of claims 1 to 7,
A concentrating solar power generation module comprising a heat insulating sheet inserted between the heat sink and the module plate.

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