JP4794402B2 - Solar cell and concentrating solar power generation unit - Google Patents

Description

  The present invention relates to a solar cell including a solar cell element and a receiver substrate on which the solar cell element is mounted, and a concentrating solar power generation unit including a solar cell mounting plate on which such a solar cell is mounted.

  Solar power generation devices (solar power generation units) that convert solar energy into electric power have been put into practical use, but in order to reduce costs and obtain even higher power, sunlight collected by a condenser lens is used. A concentrating solar power generation device (concentrating solar power generation unit) of a type that takes out electric power by irradiating a solar cell element smaller than the light receiving area of the condensing lens is being put into practical use.

  A concentrating solar power generation device condenses sunlight with a condensing lens and irradiates the solar cell element, so the solar cell element has a small light receiving area that can receive sunlight collected by the optical system Should be provided. That is, since the solar cell element having a size smaller than the light receiving area of the condensing lens may be used, the size of the solar cell element can be reduced, so that the usage amount of the solar cell element that is an expensive component in the solar power generation device The cost can be reduced. Due to such advantages, the concentrating solar power generation apparatus is being used for power supply in an area where power can be generated using a large area.

As a concentrating solar power generation device, a simple configuration in which a solar cell module is attached to a support plate is proposed, so that sufficient strength and rigidity can be obtained without increasing the weight, and heat dissipation can be obtained. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 11-284217

  Energy due to light collection at the light receiving position is extremely large, and measures for preventing damage due to irradiation around the solar cell element are necessary as measures for heat dissipation. However, the concentrating solar power generation device described in Patent Document 1 has problems in terms of mass productivity, installation workability, maintenance management, etc., because the heat dissipation structure is complicated and large, and the production process is complicated. .

  In addition, the concentrating solar power generation apparatus is often installed in a region such as a desert where the temperature change is severe, and it is necessary to take measures against thermal expansion against a temperature rise.

  In other words, in order to obtain a solar power generation device that reliably extracts power from sunlight, appropriate measures against heat and light collection in the mounting of solar cell elements, adjustment of the positional relationship between the solar cell elements and the optical system, etc. Is very important.

  This invention is made | formed in view of such a condition, By mounting a solar cell element in the receiver board | substrate which has a connection pattern layer laminated | stacked on the base base via the base base and the intermediate | middle insulating layer. An object of the present invention is to provide a solar cell having a simple structure, high insulation and heat dissipation, and high reliability and power generation efficiency.

  The present invention includes a solar cell in which a solar cell element is mounted on a receiver substrate, a solar cell mounting plate on which the receiver substrate is fixed, and a radiator disposed on the back side of the receiver substrate, thereby providing a simple heat dissipation structure. Another object is to provide a concentrating solar power generation unit with good heat dissipation and productivity and high power generation efficiency.

A solar cell according to the present invention is a solar cell comprising a solar cell element having a substrate electrode and a surface electrode, and a receiver substrate on which the solar cell element is placed, wherein the receiver substrate is formed of a metal plate. A base base, an intermediate insulating layer stacked on the base base, and a connection pattern layer stacked on the intermediate insulating layer, and the substrate electrode and the surface electrode are connected to the connection pattern layer, respectively. The intermediate insulating layer is formed of an epoxy resin material filled with a highly heat-conductive inorganic filler, and the surface electrode is formed at four corners of the solar cell element, each of which is wired to the connection pattern layer. Current collector electrodes extending along the four sides of the solar cell element, and L-shaped branch currents extending from the current collector electrodes in the chip diagonal direction so as to intersect the four sides. Characterized in that it comprises a.

With this configuration, since the solar cell element can be easily insulated from the base base, the base base can be effectively used as a heat dissipation means with high heat dissipation efficiency, and has a simple structure and high insulation and heat dissipation. Thus, it is possible to obtain a solar cell having good power generation efficiency and excellent reliability. In addition, since the current generated in the solar cell element can be collected at the shortest distance and taken out from each surface electrode, a solar cell with improved current collection efficiency can be obtained.

In the solar cell according to the present invention, the thickness of the intermediate insulating layer is 50 to 100 μm .

With this configuration, it is possible to easily make a highly reliable solar cell by effectively utilizing the base base as a heat dissipation means with high heat dissipation efficiency .

  Moreover, in the solar cell according to the present invention, the receiver substrate and the solar cell element are each rectangular, and the solar cell element is arranged so that each side intersects with a diagonal of the receiver substrate. It is characterized by that.

  With this configuration, when the receiver substrate is mounted on a solar cell mounting plate and applied to a concentrating solar power generation unit, each side of the solar cell element can be inclined with respect to the vertical direction. Since it is possible to prevent the moisture that has entered from the water from staying at positions corresponding to the respective sides of the solar cell element, the solar cell can be improved in moisture resistance and weather resistance.

In the solar cell according to the present invention, the current collecting electrode is formed so as to be thin at the center of each of the four sides and to be thick at the surface electrode side . With this configuration, it is possible to improve the photoelectric conversion efficiency by balancing the securing of the photoelectric conversion area and the characteristic deterioration due to the resistance in the current path.

In the solar cell according to the present invention, the highly thermally conductive inorganic filler is aluminum. With this configuration, it is possible to easily make a highly reliable solar cell by effectively utilizing the base base as a heat dissipation means with high heat dissipation efficiency.

Further, the concentrating solar power generation unit according to the present invention includes a solar cell element and a solar cell having a receiver substrate on which the solar cell element is mounted, and a plurality of solar cells that are long and arranged in a row in the length direction. A concentrating solar power generation unit comprising a solar cell mounting plate on which the receiver substrate is mounted and a long frame on which the solar cell mounting plate is mounted , wherein the solar cell is a solar cell according to the present invention. And a radiator is disposed on the back side of the receiver substrate opposite to the surface side on which the solar cell element is placed, corresponding to the solar cell element.

  With this configuration, it is possible to dissipate heat from sunlight that is collected and applied to the solar cell element via the receiver substrate and the radiator, so heat dissipation and productivity are improved with a simple heat dissipation structure. It becomes a concentrating solar power generation unit with high power generation efficiency.

  Moreover, in the concentrating solar power generation unit according to the present invention, the radiator is a heat dissipation that abuts on the solar cell mounting plate on the back surface side opposite to the front surface side of the solar cell mounting plate on which the receiver substrate is mounted. It is characterized by comprising a base and a heat dissipation projection protruding from the heat dissipation base.

  With this configuration, since a heat dissipation path can be configured by the receiver substrate, the solar cell mounting plate, the heat dissipation base, and the heat dissipation protrusion, a concentrating solar power generation unit having a simple heat dissipation structure and high heat dissipation can be obtained.

  In the concentrating solar power generation unit according to the present invention, the radiator includes a heat radiating base integrated with the receiver substrate, and a heat radiating protrusion protruding from the heat radiating base.

  With this configuration, a heat dissipation path can be configured by the receiver substrate, the heat dissipation base, and the heat dissipation protrusion, so that the solar cell and the heatsink can be easily and reliably mounted on the solar cell mounting plate, and the heat dissipation is high with a simple heat dissipation structure. It becomes a concentrating solar power generation unit.

  Moreover, in the concentrating solar power generation unit according to the present invention, the heat dissipation base is configured such that the thickness of the portion corresponding to the solar cell element is thicker than the thickness of the portion away from the solar cell element. Features.

  With this configuration, the thermal resistance can be surely reduced, and a concentrating solar power generation unit with higher heat dissipation can be obtained.

According to the solar cell of the present invention, the solar cell element is placed on the receiver substrate including the base base, the intermediate insulating layer stacked on the base base, and the connection pattern layer stacked on the intermediate insulating layer. Since the external connection terminal of the solar cell element is taken out from the connection pattern layer, the solar cell element can be insulated from the base base and the base base can be effectively used as a heat dissipation means, and has a simple structure and high insulation. It has heat dissipation and has the effect of achieving high reliability and power generation efficiency. In addition, since surface electrodes are formed at the four corners of the solar cell element, current can be collected at the shortest distance and taken out from each surface electrode, a solar cell with improved current collection efficiency can be obtained. .

  That is, since the solar cell according to the present invention has a simple structure and high insulation and heat dissipation, it is applied to a solar cell on which a concentrating solar cell element that collects and irradiates sunlight is placed. And has a remarkable effect.

  Moreover, according to the concentrating solar power generation unit according to the present invention, the receiver substrate on which the solar cell element is placed is fixed to the solar cell mounting plate, and the receiver substrate opposite to the surface side on which the solar cell element is placed. Since the radiator is arranged on the back surface side of the solar cell element so as to correspond to the solar cell element, it is possible to radiate the heat generated by the sunlight that is collected and applied to the solar cell element via the receiver substrate and the radiator. This makes it possible to achieve a high heat generation efficiency with high heat dissipation and productivity with a simple heat dissipation structure.

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

<Embodiment 1>
Based on FIG. 1 and FIG. 2, the solar cell which concerns on Embodiment 1 of this invention is demonstrated.

  1A and 1B are explanatory diagrams for explaining a solar cell according to Embodiment 1 of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view showing a cross-sectional state taken along arrows BB in FIG. FIG. FIG. 2 is an enlarged plan view showing the state of the surface electrode of the solar cell element shown in FIG. 1 in an enlarged manner.

  The solar cell 10 according to the present embodiment includes a concentrating solar cell element 11 that photoelectrically converts sunlight that has been collected and irradiated, and a receiver substrate 20 on which the solar cell element 11 is placed. Prepare. Further, a bypass diode 12 is connected to the solar cell element 11 in parallel.

  The bypass diode 12 secures a current path in the case where the solar cell element 11 operates as a resistance by blocking sunlight, for example, a concentrating solar power generation unit 40 by connecting a plurality of solar cell elements 11. (See FIG. 3), the power generation function can be maintained as a whole even when the specific solar cell element 11 does not perform the power generation function.

  The solar cell element 11 is formed by forming a PN junction, an electrode (substrate electrode, surface electrode) or the like by a known semiconductor manufacturing process using a GaAs compound semiconductor, for example, and processing it into a chip of about 5 to 10 mm square from the wafer. It is.

  The solar cell element 11 includes a substrate electrode (not shown) on the substrate side of the chip and a surface electrode 14 (see FIG. 2) on the surface side of the chip as electrodes. The surface electrode 14 is formed at each of the four corners of the chip. Further, the surface electrode 14 is extended in the chip diagonal direction from the current collecting electrode 15 and the chip diagonal line so as to intersect each side of the chip and the current collecting electrode 15 extending along the four sides of the semiconductor substrate. Are formed integrally with the branch electrode 16 constituting the L-shaped electrode.

  With this electrode configuration, the solar cell element 11 can collect the generated current to each current collecting electrode 15 at the shortest distance and take it out from each surface electrode 14, so that the voltage drop due to resistance in the current path is small. It becomes possible to set it as the solar cell 10 which improved the current collection efficiency. As the electrode material, for example, silver, titanium or the like can be applied.

  The collecting electrode 15 is formed so as to be thin at the center of each side of the chip and thick at the surface electrode 14 side to balance the securing of the photoelectric conversion area and the characteristic deterioration due to resistance in the current path. Thus, the photoelectric conversion efficiency is improved.

  The receiver substrate 20 includes a base base 21, an intermediate insulating layer 22 stacked on the base base 21, a connection pattern layer 23 stacked on the intermediate insulating layer 22, and a surface protective layer 27 that protects the connection pattern layer 23. The receiver substrate 20 is, for example, 40 to 80 mm square with respect to the solar cell element 11 of about 8 to 10 mm. The layers of the receiver substrate 20 can be stacked by applying an appropriate adhesive or the like.

  The base base 21 is made of, for example, an aluminum plate and has a thickness of about 1 to 4 mm, for example. By using an aluminum plate, it is possible to improve heat dissipation and reduce weight. A copper plate or the like can be applied instead of the aluminum plate.

  The intermediate insulating layer 22 is made of, for example, an epoxy resin material that is highly filled with a highly thermally conductive inorganic filler (for example, aluminum), and has a thickness of, for example, about 50 to 100 μm. By applying an epoxy resin material highly filled with a highly heat-conductive inorganic filler (for example, aluminum), the solar cell element 11 is easily and reliably insulated from the base base 21 through a thin insulating film (intermediate insulating layer 22). Therefore, it is possible to easily make the solar cell 10 highly reliable by effectively utilizing the base base 21 as a heat dissipation means with high heat dissipation efficiency.

  The connection pattern layer 23 is made of, for example, copper foil, and has a thickness of about 50 to 100 μm, for example. The connection pattern layer 23 includes a surface electrode connection pattern 23s to which the surface electrode 14 of the solar cell element 11 is connected and a substrate electrode connection pattern 23b to which the substrate electrode of the solar cell element 11 is connected.

  By configuring the connection pattern layer 23 with a copper foil, it becomes possible to easily and reliably connect the solar cell element 11 to the surface electrode 14 and the substrate electrode. This can be easily performed via the surface electrode extraction terminal 24 and the substrate electrode extraction terminal 25) respectively formed at the end of the connection pattern layer 23.

  The substrate electrode of the solar cell element 11 is bonded to the substrate electrode connection portion 23bc as a connection region of the substrate electrode connection pattern 23b with, for example, solder. The surface electrode 14 of the solar cell element 11 is connected via a wire 17 to a surface electrode connection portion 23sc as a connection region of the surface electrode connection pattern 23s. The surface electrode of the bypass diode 12 is connected via a wire 18 to a surface electrode connection portion 23d which is a connection region of the surface electrode connection pattern 23s. The wires 17 and 18 are made of, for example, 250 μmφ aluminum wire, and are joined by ultrasonic eutectic. In FIG. 1B, the wires 17 and 18 are not shown.

  The surface protective layer 27 is made of, for example, a solder resist and has a thickness of about 50 μm, for example. Cover the surface of the receiver substrate 20 except for the areas where connection is required (for example, the substrate electrode connection portion 23bc, the surface electrode connection portion 23sc, the surface electrode connection portion 23d, the surface electrode extraction terminal 24, the substrate electrode extraction terminal 25, etc.) To protect it. The surface protective layer 27 can reliably improve the insulation between the substrate electrode connection pattern 23b and the surface electrode connection pattern 23s, and can further improve the reliability of the solar cell 10.

  A surface electrode extraction terminal 24 as a connection region is formed at the end of the surface electrode connection pattern 23s, and a substrate electrode extraction terminal 25 as a connection region is formed at the end of the substrate electrode connection pattern 23b. Since the surface protective layer 27 is not formed on the surface electrode extraction terminal 24 and the substrate electrode extraction terminal 25, the surface electrode extraction terminal 24 and the substrate electrode extraction terminal 25 can act as an extraction terminal to the outside of the solar cell 10, and are connected via an appropriate connection line (not shown). Thus, the adjacent solar cells 10 can be connected to each other.

  In the solar cell 10 according to the present embodiment, since the solar cell element 11 is insulated from the base base 21, the surface electrode 14 and the substrate electrode of the solar cell element 11 are connected to the connection pattern layer 23, respectively. Independent terminals (surface electrode extraction terminal 24, substrate electrode extraction terminal 25) can be extracted. Therefore, since the base base 21 is made of a metal having high thermal conductivity, it can be effectively used as a heat dissipation means with good heat dissipation efficiency. Therefore, the solar cell 10 has a simple structure and high insulation and heat dissipation. Thus, the solar cell is highly reliable and has high power generation efficiency.

  A pair of mounting coupling holes 20 h for mounting and fixing the solar cell 10 (receiver substrate 20) on the solar cell mounting plate 47 (see FIG. 3) is formed on the receiver substrate 20 on a diagonal line. The mounting coupling hole 20h is arranged at a corner portion different from the surface electrode extraction terminal 24 and the substrate electrode extraction terminal 25 so that mutual insulation can be easily secured.

  Further, in order to protect the solar cell element 11 and the bypass diode 12, a covering portion 30 is formed in a central portion of the receiver substrate 20 so as to cover the solar cell element 11 and the bypass diode 12 in an appropriate shape. The covering portion 30 may be omitted as appropriate in consideration of ease of explanation and understanding.

  In solar cell 10 according to the present embodiment, solar cell element 11 and receiver substrate 20 are each rectangular, and solar cell element 11 is arranged so that each side intersects with a diagonal line of receiver substrate 20. is there. The covering portion 30 is formed in a shape (rectangular shape) corresponding to the rectangular shape of the solar cell element 11. The rectangular shape is more preferably a square and the intersection is more preferably orthogonal, but is not limited thereto.

  When the solar cell 10 is mounted on the solar cell mounting plate 47 and applied to the concentrating solar power generation unit 40 due to the arrangement relationship between the solar cell element 11 and the receiver substrate 20, each of the solar cell element 11 and the covering portion 30. The sides can be inclined with respect to the vertical direction, and moisture that has entered from the outside can be prevented from staying at positions corresponding to the sides of the solar cell element 11 (covering portion 30). It is possible to obtain a solar cell with improved resistance.

<Embodiment 2>
Based on FIG. 3 thru | or FIG. 7, the concentrating photovoltaic power generation unit which concerns on Embodiment 2 of this invention is demonstrated.

  FIG. 3 is an exploded perspective view showing the schematic configuration of the concentrating solar power generation unit according to Embodiment 2 of the present invention in an exploded manner.

  The concentrating solar power generation unit 40 according to the present embodiment includes a translucent protection plate 41 disposed corresponding to the top surface of the concentrating solar power generation unit 40, and the back surface of the translucent protection plate 41 ( A condensing lens 42 which is fixed to the lower side in the drawing and condenses sunlight and a long frame 44 which is a basic structure of the concentrating solar power generation unit 40 are provided.

  The long frame 44 has a U-shape composed of a side portion 44s and a bottom portion 44b. The side portion 44 s holds the translucent protective plate 41 and is adjusted to a height that allows the solar cell 10 to correspond to the focal length of the condenser lens 42. The bottom portion 44b is configured to hold a pair of opposing side portions 44s and attach the solar cell mounting plate 47 on which the solar cell 10 is mounted to the back surface (the lower side in the drawing).

  The translucent protection plate 41 is made of, for example, glass in consideration of translucency, strength, environmental resistance, and the like, and can eliminate the influence of wind and rain from the surrounding environment. Note that acrylic resin, polycarbonate, or the like can be used instead of glass.

  A plurality of condensing lenses 42 are arranged in a row on the translucent protective plate 41 so as to correspond to the solar cell 10 and constitute a lens array. The condenser lens 42 is bonded to the translucent protective plate 41 with an appropriate adhesive. The condensing lens 42 is made of, for example, an acrylic resin in consideration of processability and translucency. Note that polycarbonate, glass, or the like can be used instead of the acrylic resin.

  The long frame 44 is integrally formed as a whole including the side portion 44s and the bottom portion 44b by, for example, roll forming a metal plate such as an iron plate or a steel plate. An appropriate rim 44 f for fixing the translucent protective plate 41 is formed on the top surface of the long frame 44. In addition, a sunlight irradiation hole 45 for irradiating the solar cell 10 with the sunlight collected by the condenser lens 42 is formed in the bottom 44b. By forming the long frame 44 from a metal plate such as an iron plate or a steel plate, it is possible to ensure mechanical strength and weather resistance.

  The solar cell mounting plate 47 has a long shape like the long frame 44, and is configured to mount a plurality of solar cells 10 in a row in the length direction (see FIG. 4). The solar cell mounting plate 47 is made of, for example, an aluminum plate in consideration of weight reduction and heat dissipation. In addition, the solar cell 10 (solar cell element 11) is the center of the condensing unit region FA for each condensing unit region FA configured corresponding to the condensing lens 42 (the focal position of the condensed sunlight: the sun). They are arranged corresponding to the light irradiation holes 45). A plurality of solar cell mounting plates 47 can be attached to the long frame 44.

  The solar cell 10 has been described in the first embodiment, and the solar cell element 11 is placed on the receiver substrate 20. In addition, an appropriate rim 47f for mounting on the bottom 44b is formed around the solar cell mounting plate 47.

  FIG. 4 is a plan view showing an arrangement state of solar cells mounted on the solar cell mounting plate of the concentrating solar power generation unit shown in FIG.

  The solar cell 10 is arranged at the center of the condensing unit area FA of the solar cell mounting plate 47. The solar cell mounting plate 47 is rectangular in consideration of the ease of mounting of the solar cells 10 and a plurality of solar cells 10 are arranged in a row in the length direction. Here, although shown as a single row, it is possible to use a solar cell mounting plate 47 in which, for example, 10 (2 × 5) solar cells 10 in total are arranged as an appropriate number of rows (for example, 2 rows). .

  The solar cell 10 aligns the mounting coupling hole 20h formed in the receiver substrate 20 and the mounting coupling hole 47h (see FIG. 5) formed in the solar cell mounting plate 47 so as to correspond to the mounting coupling hole 20h. A mounting connecting pin 20p such as a rivet is fitted into the solar cell mounting plate 47 by being inserted.

  The receiver substrate 20 is arranged in parallel in the column direction (the length direction of the solar cell mounting plate 47). That is, the pair of opposing sides of the receiver substrate 20 are arranged so as to be parallel to the sides of the solar cell mounting plate 47. With this configuration, each side of the solar cell element 11 is inclined with respect to the vertical direction when the solar cell mounting plate 47 (concentrating solar power generation unit 40) is arranged in the vertical or horizontal direction toward sunlight. Will be. Accordingly, moisture that has entered from the outside of the concentrating solar power generation unit 40 can be prevented from staying on each side of the solar cell element 11 (covering portion 30), and thus the moisture resistance and weather resistance of the solar cell 10 are improved. It becomes possible.

  FIG. 5 is a cross-sectional view showing Example 1 of the heat radiator applied to the concentrating solar power generation unit according to Embodiment 2 of the present invention as a cross-sectional state taken along arrows AA in FIG. 4. 6A and 6B are explanatory views for explaining the radiator shown in FIG. 5, in which FIG. 6A is a plan view showing a tip state of the heat dissipation protrusion, and FIG. 6B is a front view showing a protrusion state of the heat dissipation protrusion. .

  Since the base 21 constituting the back surface of the receiver substrate 20 is insulated from the solar cell element 11, the radiator 50 is easily arranged with a simple structure so as to correspond to the back surface side of the receiver substrate 20. It becomes possible. That is, in this embodiment, the radiator 50 is disposed on the back surface side (base base 21 side) opposite to the front surface side of the receiver substrate 20 on which the solar cell element 11 is placed, corresponding to the solar cell element 11. It is.

  The radiator 50 according to the present embodiment includes a heat dissipating base 51 having a flat surface that contacts the solar cell mounting plate 47 on the back surface side opposite to the front surface side of the solar cell mounting plate 47 on which the receiver substrate 20 is mounted, And a heat dissipation protrusion 52 protruding from the heat dissipation base 51. That is, the heat dissipation base 51 is configured to contact the solar cell mounting plate 47 in correspondence with the solar cell element 11 (receiver substrate 20) on the back surface side opposite to the front surface side of the solar cell mounting plate 47 on which the solar cell 10 is mounted. It is as.

  The heat radiator 50 can be easily formed at low cost and reduced in weight by, for example, molding (extrusion processing, mold processing, etc.) aluminum that is lightweight and has good workability. The heat radiating protrusion 52 can be formed in various shapes such as a pin shape (see FIG. 6) or a fin shape, for example, and is integrated with the heat radiating base portion 51 to reduce the thermal resistance and further increase the heat radiating efficiency. It becomes possible to improve.

  Since the receiver substrate 20 (base base 21), the solar cell mounting plate 47, and the heat dissipation base 51 are brought into contact (connected) with each other, the mounting coupling hole 20h in the receiver substrate 20 and the mounting coupling hole in the solar cell mounting plate 47 are provided. 47h, a heat dissipation coupling hole 50h is formed in the heat dissipation base 51 so as to correspond to each other. That is, the receiver substrate 20 (base base 21), the solar cell mounting plate 47, and the heat dissipation base 51 are mounted by the mounting coupling pin 20p that is inserted through the mounting coupling hole 20h, the mounting coupling hole 47h, and the heat dissipation coupling hole 50h. Since it is firmly pressed (crimped), it is possible to reduce heat resistance in the heat dissipation path between them and improve heat dissipation. Note that the mounting coupling pin 20p can be formed of, for example, a rivet.

  The heat applied to the receiver substrate 20 by sunlight condensed toward the solar cell element 11 is radiated through the receiver substrate 20 (base base 21), the solar cell mounting plate 47, the heat dissipation base 51, and the heat dissipation protrusion 52. Since a heat dissipation path with high performance can be configured, the concentrating solar power generation unit 40 with high heat dissipation can be obtained with a simple heat dissipation structure.

  Moreover, since the heat radiation base 51 has a thickness t1 corresponding to the solar cell element 11 (portion close to the solar cell element 11) thicker than a thickness t2 away from the solar cell element 11, heat dissipation. The thermal resistance of the path can be reliably reduced, and the concentrating solar power generation unit 40 with higher heat dissipation can be obtained.

  As described above, in the present embodiment, the heat radiator 50 having a simple structure and high heat dissipation is disposed in correspondence with each solar cell element 11, and thus the weight can be reduced and the heat dissipation and power generation efficiency are high. The concentrating solar power generation unit 40 can be configured. In addition, since the heat radiator 50 has a simplified structure, the productivity is good and the manufacturing cost can be reduced.

  FIG. 7 is a cross-sectional view showing Example 2 of the heat radiator applied to the concentrating solar power generation unit according to Embodiment 2 of the present invention as a cross-sectional state taken along arrows AA in FIG. 4.

  Since the heat radiator 53 according to the present embodiment is a modification of the heat radiator 50 of the first embodiment, differences from the first embodiment will be mainly described. As in the first embodiment, the radiator 53 is disposed on the back surface side (base base 21 side) opposite to the front surface side of the receiver substrate 20 on which the solar cell element 11 is placed, corresponding to the solar cell element 11. It is.

  The radiator 53 includes a heat radiating base 54 integrated with the receiver substrate 20 (base base 21), and a heat radiating protrusion 55 protruding from the heat radiating base 54. That is, similarly to Example 1, the solar cell 10 is configured to include the radiator 53 having the heat dissipation base 54 and the heat dissipation protrusion 55.

  Since the receiver substrate 20 and the heat dissipation base 54 are integrated, the receiver substrate 20 is mounted by the mounting coupling pin 20p that is inserted through the mounting coupling hole 20h of the receiver substrate 20 and the mounting coupling hole 47h of the solar cell mounting plate 47. If 20 is fixed to the solar cell mounting plate 47, the radiator 53 is also fixed to the solar cell mounting plate 47. That is, it is possible to simplify the manufacturing process by omitting the work for coupling the radiator 53 to the solar cell mounting plate 47, so that the concentrating solar power generation unit that is easy to assemble and has high heat dissipation properties. 40.

  Since the receiver substrate 20 and the heat radiating base 54 are integrated, it is possible to further reduce the thermal resistance in the heat radiating path as compared with the radiator 50 of the first embodiment, and to surely improve the heat dissipation. Is possible.

  Further, as in Example 1, the heat dissipation base 54 has a thickness t1 at a portion corresponding to the solar cell element 11 greater than a thickness t2 at a portion away from the solar cell element 11, so that the heat dissipation path It becomes possible to reduce heat resistance reliably, and it can be set as the concentrating solar power generation unit 40 with high heat dissipation.

  An appropriate step 54 s is formed between the receiver substrate 20 (base base 21) and the heat dissipation base 54, and the step 54 s is fitted into a fitting through hole 47 i formed in the solar cell mounting plate 47. Is possible. With this configuration, alignment when the solar cell 10 is mounted on the solar cell mounting plate 47 is facilitated, and productivity can be improved.

  As described above, in Example 2, since the receiver substrate 20 and the heat dissipation base 54 are integrated, the solar cell 10 protrudes from the heat dissipation base 54 integrated with the base base 21 and the heat dissipation base 54. A heat radiator 53 including the heat radiating protrusion 55 is provided.

It is explanatory drawing explaining the solar cell which concerns on Embodiment 1 of this invention, (A) is a top view, (B) is sectional drawing which shows the cross-sectional state in the arrow BB of (A). It is an enlarged plan view which expands and shows the state of the surface electrode of the solar cell element shown in FIG. It is a disassembled perspective view which decomposes | disassembles and shows schematic structure of the concentrating solar power generation unit which concerns on Embodiment 2 of this invention. It is a top view which shows the arrangement | positioning state of the solar cell mounted in the solar cell mounting board of the concentrating photovoltaic power generation unit shown in FIG. It is sectional drawing which shows Example 1 of the heat radiator applied to the concentrating photovoltaic power generation unit which concerns on Embodiment 2 of this invention as a cross-sectional state in the arrow AA of FIG. It is explanatory drawing explaining the heat radiator shown in FIG. 5, (A) is a top view which shows the front-end | tip state of a thermal radiation projection part, (B) is a front view which shows the protrusion state of a thermal radiation projection part. It is sectional drawing which shows Example 2 of the heat radiator applied to the concentrating solar power generation unit which concerns on Embodiment 2 of this invention as a cross-sectional state in the arrow AA of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Solar cell 11 Solar cell element 14 Surface electrode 17, 18 Wire 20 Receiver board | substrate 21 Base base 22 Intermediate insulating layer 23 Connection pattern layer 23s Surface electrode connection pattern 23b Substrate electrode connection pattern 23d, 23sc Surface electrode connection part 23bc Substrate electrode connection Portion 24 Surface electrode lead-out terminal 25 Substrate electrode lead-out terminal 27 Surface protective layer 30 Covering portion 40 Concentrating solar power generation unit 41 Translucent protective plate 42 Condensing lens 44 Long frame 47 Solar cell mounting plate 50, 53 Heat dissipation Units 51, 54 Radiation base 52, 55 Radiation protrusion

Claims (9)

A solar cell comprising a solar cell element having a substrate electrode and a surface electrode, and a receiver substrate on which the solar cell element is placed,
The receiver substrate includes a base base formed of a metal plate, an intermediate insulating layer stacked on the base base, and a connection pattern layer stacked on the intermediate insulating layer,
The substrate electrode and the surface electrode are each connected to the connection pattern layer,
The intermediate insulating layer is formed of an epoxy resin material filled with a high thermal conductive inorganic filler ,
The surface electrode is formed at four corners of the solar cell element, each connected to the connection pattern layer with a wire, and the collector electrode extending along four sides of the solar cell element and the 4 A solar cell comprising: an L-shaped branch electrode extending in a chip diagonal direction from the current collecting electrode so as to intersect a side . 2. The solar cell according to claim 1 , wherein the current collecting electrode is formed to be thin at the center of each of the four sides and to be thick at the surface electrode side. The thickness of the intermediate insulating layer, the solar cell according to claim 1 or claim 2, characterized in that there is a 50 to 100 [mu] m. The receiver substrate and the solar cell element are each rectangular, claims 1 to, wherein said solar cell element is arranged so that each side intersecting the diagonal line of the receiver substrate Item 4. The solar cell according to any one of Items 3 . The highly thermally conductive inorganic filler, the solar cell according to any one of claims 1 to claim 4, characterized in that aluminum. A solar cell having a solar cell element and a receiver substrate on which the solar cell element is mounted, a solar cell mounting plate in which a plurality of the receiver substrates are mounted in an elongated shape in a row shape, and the solar cell A concentrating solar power generation unit comprising a long frame on which a mounting plate is mounted,
The said solar cell is a solar cell as described in any one of Claim 1 thru | or 5 , The said solar cell is on the back surface side of the said receiver board | substrate opposite to the surface side in which the said solar cell element was mounted. A concentrating solar power generation unit, characterized in that a radiator is arranged corresponding to the element. The radiator includes a heat dissipating base that contacts the solar cell mounting plate on the back side opposite to the front surface side of the solar cell mounting plate on which the receiver substrate is mounted, and a heat dissipating protrusion that protrudes from the heat dissipating base. The concentrating solar power generation unit according to claim 6 . The concentrating solar power generation unit according to claim 6 , wherein the radiator includes a heat radiating base integrated with the receiver substrate, and a heat radiating protrusion protruding from the heat radiating base. 9. The light collecting base according to claim 7 or 8 , wherein the heat radiation base portion has a thickness corresponding to the solar cell element thicker than a thickness away from the solar cell element. Type solar power generation unit.

Images