KR101261877B1 - Focus unit maxizing heat absorption and photovoltaic assembly using the same - Google Patents

Abstract

Disclosed is a light condensing unit for condensing solar light incident through a Fresnel lens and delivering the solar light to a cell of a cell receiver. The condensing unit may include a first condensing part having a cylindrical shape having an inclined angle in which a horizontal cross-sectional area increases from a lower end to an upper end; And a second light collecting part made of glass material, which is coupled to a lower end of the first light collecting part and is a volume body having an inclination angle in which a horizontal cross-sectional area increases from a lower end to an upper end, wherein a lower end surface of the second light collecting part is the solar cell. Contact the cell.

Description

FOCUS UNIT MAXIZING HEAT ABSORPTION AND PHOTOVOLTAIC ASSEMBLY USING THE SAME}

The present invention relates to a light collecting unit of a solar cell assembly that maximizes heat absorption.

In general, a solar cell (PV; PHOTOVOLTAIC) is a cell that converts the incident solar energy directly into electrical energy.

Since solar cells use pollution-free and unlimited solar energy, they do not require fuel, they are eco-friendly with no air pollution or waste generation, and because they are semiconductor devices, they have almost no mechanical vibration and noise. The development is active externally.

There are two types of solar cells that directly inject sunlight into multiple cells without reflection or refraction, and collect light by installing a reflector in front of the multiple cells.

In particular, in the case of a focusing solar cell, in order to obtain high power conversion efficiency, a power conversion efficiency is increased by concentrating sunlight incident to a cell by 500 times or more with a Fresnel lens.

However, since the wavelength band of the sunlight focused from the Fresnel lens is wide and incident at various angles, it is difficult to collect all of them, so there is a problem in that the efficiency is low even when using an expensive Fresnel lens.

To this end, in Korean Patent Publication No. 2010-42074, the first collection of a cylindrical shape in which solar light incident through a lens is collected and transmitted to a solar cell of a cell receiver, and a cross sectional area is increased at a first inclination angle from a bottom to a top. mine worker; And a cylindrical second condensing portion extending from an upper end of the first condensing portion and having a cross sectional area increasing at a second inclination angle greater than the first inclination angle, wherein the first condensing portion and the second condensing portion form a unitary body. And total reflection occurs between inner and outer surfaces of the first and second condensing portions, the first and second condensing portions are made of glass, and the first and second condensing portions have refractive indices of respective inner surfaces. Disclosed is a light collecting unit of a solar cell assembly processed to have a refractive index higher than that of an outer surface.

According to this configuration, since the collected light is transmitted without loss, the light collecting efficiency is maximized and the output efficiency of the solar cell is significantly increased.

However, even with this advantage, since heat absorption does not occur in the process of condensing, the heat load caused by solar light is transferred to the solar cell as it is, so that the efficiency of the solar cell is reduced and the lifespan is shortened.

Accordingly, an object of the present invention is to provide a light collecting unit of a solar cell assembly capable of maximizing heat absorption in a light collecting process and maximizing light collecting efficiency to improve output.

Another object of the present invention to provide a solar cell assembly that can maximize the heat dissipation effect to protect the cell and improve the output.

The object of the present invention is a light converging unit for collecting solar light incident through a Fresnel lens and transferring it to a solar cell of a cell receiver, the cylindrical first light-collecting unit having an inclined angle in which a horizontal cross-sectional area increases from a lower end to an upper end; And a second light collecting part made of glass material, which is coupled to a lower end of the first light collecting part and is a volume body having an inclination angle in which a horizontal cross-sectional area increases from a lower end to an upper end, wherein a lower end surface of the second light collecting part is the solar cell. It is achieved by the light collecting unit of the solar cell assembly in contact with the cell.

In addition, the above object is a cell receiver mounted with a cell and a pair of output terminals; The solar cell has a cylindrical first converging portion having an inclined angle of a vertical section increasing from a lower end to a top and a volume body which is coupled to a lower end of the first condensing unit and whose inclination angle of a vertical cross section increases from a lower end to an upper end. A light collecting unit comprising a second light collecting part made of glass material in contact with the light collecting unit; A heat dissipation block to which the cell receiver is fixed; And a heat pipe buried to partially expose the surface of the heat dissipation block and in contact with the cell receiver.

Preferably, the size of the bottom surface of the second condenser may be the same as the size of the solar cell.

In addition, a silicon or epoxy adhesive may be interposed between the bottom surface of the second condenser and the solar cell.

Preferably, the top surface of the second light collecting portion may be subjected to an anti reflect coating.

In addition, preferably, the inclination angle of the first condenser may be greater than the inclination angle of the second condenser, and the inclination angle of the second condenser may be 0 degrees or more and 30 degrees or less.

Preferably, the second condenser may be configured to be coupled to the lower end of the first condenser, and a lower portion having a curvature slope may be integrally formed so that the radius of curvature increases from the upper and lower ends of the inclined angle to 0 degrees.

Preferably, the cell receiver may be attached to the heat dissipation block by a heat dissipation adhesive, or may be fixed to the heat dissipation block by an insulation clamp having one end fixed to the heat dissipation block and the other end pressing the cell receiver.

Here, when fixed by the insulating clamp, a heat dissipation grease may be interposed between the cell receiver and the heat dissipation block.

Preferably, a groove is formed in the heat dissipation block so that the heat pipe is embedded, and heat dissipation grease or a heat dissipation adhesive may be applied to an inner surface of the groove.

Preferably, the heat pipe may be deformed in cross section by pressurization so that a portion contacting the cell receiver may be flat.

Preferably, the cell receiver and the heat dissipation block portion adjacent thereto may be covered by a silicone resin.

Preferably, the heat dissipation block is formed by the body and the heat dissipation fins are integrally formed, the heat dissipation fins may extend radially from the body.

Preferably, both edges in the vertical cross section of the heat dissipation fin may be formed in a saw blade shape, and more preferably, branches may be formed at regular intervals at both edges in the vertical cross section of the heat dissipation fin.

Preferably, the apparatus further includes a support member bent in an inverted U shape to support the light converging unit, and both ends of the support member are fixed to the heat dissipation block, and a through hole is formed at an intermediate portion of the support member. The unit can be fitted.

At the boundary between the first and second light collecting parts, the first and second light collecting parts are respectively fixed to the support member independently, the first light collecting part is fitted or riveted to the support member, and the second light collecting part is It may be press-fixed by at least a pair of support pieces bent from the through hole.

Preferably, the heat dissipation block is composed of a body and a plurality of heat dissipation fins adhered to the body, the heat dissipation fins may be stacked in a predetermined gap.

According to the above structure, heat is transmitted to the second condenser while light passes through the second condenser, thereby reducing approximately 30% to 40% of the heat load applied to the solar cell, thereby preventing the solar cell from decreasing efficiency. Can extend the service life.

In addition, the light collected from the Fresnel lens is collected again at the first condenser and incident to the second condenser, and the incident light is totally reflected while passing through the second condenser to minimize the loss of light.

In addition, the heat dissipation capacity can be reduced due to heat absorption by the second light collecting part, thereby reducing the cost of the heat dissipation structure.

1 is a perspective view showing a solar cell assembly according to an embodiment of the present invention.
2 is a cross-sectional view of Fig.
3 is a cross-sectional view showing a solar cell assembly according to another embodiment of the present invention.
4 is a perspective view showing a support member.
5 is a cross-sectional view showing a solar cell assembly according to another embodiment of the present invention.
6 is a cross-sectional view showing a solar cell assembly according to another embodiment of the present invention.
7 is a perspective view illustrating a solar cell assembly according to still another embodiment of the present invention, and FIG. 7A is a partial cross-sectional view.
8 is a cross-sectional view illustrating a solar cell assembly to which a heat sink having a different structure is applied.

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

1 is a perspective view showing a solar cell assembly according to an embodiment of the present invention, Figure 2 is a cross-sectional view.

Condensing unit (10, 20)

The light converging unit is coupled to the first converging portion 10 having a cylindrical shape having an inclined angle in which the horizontal cross-sectional area increases from the lower end to the upper end, and the horizontal cross-sectional area is increased from the lower end to the upper end. The second light collecting part 20 is made of glass, which is a volume body having an inclination angle.

Here, the volume body refers to a structure having a volume filled inside with a polyhedron, and in this embodiment a cube.

In FIG. 1, a pair of skirt portions 12 facing each other at the lower end of the first condensing portion 10 extend, and the second condensing portion 20 is inserted from the upper portion of the first condensing portion 10. The upper portion of the light portion 20 is pressed and fixed by the pair of skirt portions 12.

Preferably, a silicone or epoxy adhesive may be applied between the skirt portion 12 and the second light collecting portion 20 so that the first and second light collecting portions 10 and 20 may be more reliably coupled.

The first light collecting part 10 can be produced by bending a metal plate such as aluminum or stainless steel, for example.

The bottom surface of the second condenser 20 contacts the solar cell 40. Preferably, the size of the bottom surface of the second condenser may be the same as the size of the solar cell 40. According to this structure, the light collected by the second light collecting unit 20 can be reliably prevented from leaking to the outside of the solar cell 40, thereby greatly improving the light collecting efficiency.

Preferably, a silicon or epoxy adhesive 39 may be interposed between the bottom surface of the second light collecting part 20 and the cell 40.

Typically, about 4% of reflection loss occurs in the plane when light enters or exits. Therefore, when the bottom surface of the second light concentrator 20 exits and enters the solar cell 40, the reflection loss of 4% may occur, respectively, resulting in a decrease in efficiency.

In order to prevent this, as described above, a silicone or epoxy adhesive 39 having high transparency and a refractive index similar to glass, which is a material of the second condenser 20, and having no change in physical properties at high heat is applied.

In order to achieve effective adhesion, the lower surface of the second condenser 20 and the surface of the solar cell 40 are wiped with a solvent to remove foreign substances, and then a silicone or epoxy adhesive 39 is applied.

Preferably, the top surface of the second light collecting part 20 may be subjected to an anti reflect coating. The loss of light due to surface reflection is approximately 4%. By applying this structure, the surface reflection loss can be reduced to about 1%.

Preferably, the inclination angle of the first condenser 10 may be greater than the inclination angle of the second condenser 20, and the inclination angle of the second condenser 20 may be 0 degrees or more and 30 degrees or less.

The light collected from the Fresnel lens is collected again by the first condenser 10 and incident on the second condenser 20, and the incident light is totally reflected inside the second condenser 20 to minimize the loss of light.

In addition, heat is transmitted to the second light collector 20 while light passes through the second light collector 20, thereby reducing approximately 30% to 40% of the heat load applied to the cell 40. It is possible to prevent the degradation of efficiency of 40) and to prolong the service life. In addition, the heat dissipation capacity can be reduced due to heat absorption by the second light collecting part 20, thereby reducing the cost of the heat dissipation structure.

Cell receiver (30)

The cell receiver 30 has a laminated structure of three-layer substrates 31, 32, and 33, and the intermediate layer substrate 32 is an aluminum ceramic substrate having excellent insulation and heat dissipation performance, and the upper substrate 31 of the intermediate layer substrate 32. ) And the lower layer substrate 33 may be substrates in which gold plating is performed on aluminum substrates having excellent heat dissipation performance.

The upper substrate 31 is divided into two, and a + terminal 34 and a-terminal 35 are formed on each divided substrate, and the output conductors 36 and 37 are electrically connected to the terminals 34 and 35. Unlike this example, it is also possible to connect the output conductors 36 and 37 directly to the upper substrate 31 without forming a separate terminal.

As shown in FIG. 2, the cell receiver 30 is directly bonded to the heat sink 50 through the heat dissipation adhesive 38, or one end of the cell receiver 30 is fixed to the heat sink 50, and the other end of the cell receiver 30 presses the cell receiver 30. It can be fixed to the heat sink 50 using the.

When fixed by the insulating clamp, a heat dissipation grease may be interposed between the cell receiver 30 and the heat sink 50.

As described above, the heat dissipation effect between the cell receiver 30 and the heat dissipation plate 50 may be maximized through the heat dissipation adhesive 38 or the heat dissipation grease.

Preferably, the cell receiver 30 and the portion of the heat sink 80 adjacent thereto may be covered by the protective layer 70. The protective layer 70 may be formed by coating or spraying a coating material, such as a urethane resin, a phenol resin, an epoxy resin, an enamel, etc., used as an insulation of a semiconductor or PCB substrate and a waterproof coating, in addition to a silicone resin.

According to this structure, it is possible to completely block the possibility of discharge that may occur between the upper substrate 31 or the surfaces of the heat sink 80 and the upper substrate 31 or the terminals 34 and 35 in the environmental factors such as high temperature and high humidity. There is this.

Heat sink (50)

The heat sink 50 is made of a single block such as aluminum having excellent thermal conductivity, and consists of a body 51 and a plurality of heat dissipation fins 54 integrally formed therein.

The body 51 is formed in a plate shape, the groove 52 is formed to pass through the back surface of the cell receiver 30 on the surface of the body 51 is embedded with a heat pipe 60 to be described later. The groove 52 may be formed such that a vertical cross section forms a semicircular shape for the surface contact of the heat pipe 60, but is not limited thereto.

Preferably, the heat dissipation fins 54 may extend radially from the body 51. According to this structure, the gap between the heat dissipation fins 54 and the body 51 widens the gap between the heat dissipation fins 54, so that heat is discharged more efficiently.

Preferably, both edges in the vertical cross section of the heat dissipation fin 54 may have a saw blade shape to increase the contact area with the outside air so that heat dissipation may be efficiently performed.

Here, the heat dissipation fins 54 may be manufactured by an extrusion method, for example.

In addition, branches 55 may be formed at both edges at vertical edges of the heat dissipation fins 54 at a predetermined interval to widen the contact area with the outside air so that heat dissipation may be efficiently performed.

Preferably, the surface of the heat sink 50 may be anodized to prevent surface oxidation due to weathering, or may be prevented from corrosion by fluorine coating, Teflon coating or ceramic coating.

Heat pipe (60)

As described above, the groove 52 is formed on the surface of the body 51 of the heat sink 50, and the heat pipe 60 is embedded in the groove 52.

As is well known, a wick is installed inside the heat pipe 60 and a heat transfer medium is accommodated so that when heat is applied to one end, heat is rapidly transferred to the other end while the heat transfer medium is vaporized by a capillary phenomenon caused by the wick. .

Therefore, heat transmitted from the cell 40 to the cell receiver 30 is quickly transferred to the wide part of the heat sink 80 through the heat pipe 60 and is transmitted to the outside through the heat radiation fin 54.

Preferably, in order to improve the heat dissipation effect, a heat dissipation grease or a heat dissipation adhesive is applied to the inner surface of the groove 52.

Referring to FIG. 2, the heat pipe 60 may have a semicircular cross section to increase the contact area with the cell receiver 30. To this end, for example, the groove 52 may be fitted with a heat pipe 60 having a circular cross section, and then pressed into a semi-circular shape by pressing with a press.

3 is a cross-sectional view showing a solar cell assembly according to another embodiment of the present invention, Figure 4 is a perspective view showing a support member.

In the embodiment of FIG. 1, a pair of skirt portions 12 facing each other from the lower end of the first condensing portion 10 extend to press and fix the upper portion of the second condensing portion 20. 12) and the second condensing part 20 were coated with silicone or epoxy adhesive.

3 further includes a support member 80 that is bent in an inverted U shape to support the first and second light collecting portions 10, 20.

Referring to FIG. 4, a through hole 81 is formed in an upper surface of the support member 80, and two pairs of support pieces 82 are bent inwardly, so that the second condenser 20 penetrates as shown in FIG. 3. The second light converging portion 20 is fixed to the hole 81 by a pair of support pieces 82.

In addition, a plurality of slots 81a are formed adjacent to the through hole 81, and the skirt portion 12 of the first light condensing portion 10 is fitted into the slots 81a and engaged as shown in FIG.

According to this embodiment, since the first and second light collecting parts 10 and 20 are independently fixed to the support member 80, the first and second light collecting parts 10 and 20 care about the coupling between each other. no need.

5 is a cross-sectional view showing a solar cell assembly according to another embodiment of the present invention.

Unlike the embodiment of FIG. 3, the skirt 12 of the first condenser 10 is directly coupled to the support member 80 using a rivet 85 or the like without forming a slot in the support member 80. do.

6 is a cross-sectional view showing a solar cell assembly according to another embodiment of the present invention.

According to this embodiment, the second light collecting part 120 is configured by integrally forming an upper portion 121 having an inclination angle of 0 degrees and a lower portion 122 having a curvature gradient so that the radius of curvature increases from the lower portion to the upper portion.

According to this structure, when the angle of the light incident on the second light collecting part 120 is 0 degrees it can be prevented from being reflected to the outside by the curvature inclination of the lower portion 122, the solar cell 40 by the curvature inclination You can condense the light.

7 is a perspective view illustrating a solar cell assembly according to still another embodiment of the present invention, and FIG. 7A is a partial cross-sectional view.

Unlike the above embodiment, in this embodiment, the inlet of the first light collecting part 110 is configured to have a horizontal level with the upper surface of the support member 180.

The protrusion 112 protruding from the upper edge of the first light collecting part 110 is bent downward, and the protrusion 112 is formed in the slot 182 formed at the edge of the through hole of the support member 180 corresponding to the protrusion 112. ) Is inserted.

In addition, the bottom edge of the first light collecting part 110 is bent inward to form a flange 114, which presses the top surface of the second light collecting part 20.

The pair of support pieces 184 bent inwardly downward from the through hole 181 of the support member 180 presses and supports the outer surface of the first condenser 110.

Referring to FIG. 7, in this structure, the heat shield sheet 200 may be fixed to the support member 180 itself, so that a separate bracket is not required. That is, the heat shield sheet 200 is installed to prevent the conductive wires connecting the cell receiver 30 from being exposed to sunlight. In the related art, a separate bracket for fixing the heat shield sheet 200 is required.

However, according to the structure of FIG. 7, the heat shield sheet 200 may be fixed to the support member 180 using the screw 202 without a separate bracket. In fixing, the opening 201 of the thermal barrier sheet 200 and the through hole of the support member 180 face each other so that light from the Fresnel lens is not affected.

8 is a cross-sectional view illustrating a solar cell assembly to which a heat sink having a different structure is applied.

According to this embodiment, the plurality of heat dissipation fins 154 are arranged in a horizontally stacked structure with a predetermined gap, and is adhesively fixed to the body 151 by, for example, heat dissipation epoxy.

Each of the heat dissipation fins 154 is provided with a plurality of vents, and the edges of the vents protrude to form reinforcing ribs.

In the above described an embodiment of the present invention by way of example, various changes are possible at the level of those skilled in the art. Therefore, the scope of the present invention should not be construed as being limited to the above embodiments but should be interpreted by the claims described below.

10: first condenser
12: skirt portion
20: second condenser
30: cell receiver
34, 35: terminal
40: solar cell
50: heat sink
52: Groove
60: heat pipe

Claims (18)

delete delete delete delete delete delete Glass material, which is a cylindrical first converging portion having an inclined angle of increasing horizontal cross-sectional area from the bottom to the upper end, and a volume body having an inclined angle that is coupled to the lower end of the first condensing unit and increases in horizontal cross-sectional area from the lower end to the upper end. A light collecting unit consisting of a second light collecting unit;
A cell receiver in which a solar cell is mounted and a pair of output terminals are installed;
A heat dissipation block to which the cell receiver is fixed; And
A solar cell assembly comprising a heat pipe buried so as to be exposed to the surface of the heat dissipation block in contact with the cell receiver. The first curved portion having a cylindrical shape having an inclined angle in which the horizontal cross-sectional area increases from the bottom to the top, and the curvature slope so that the radius of curvature increases from the top and the bottom from the top and the bottom having an inclination angle of 0 degrees to the top A condensing unit comprising a second condensing part made of glass, which is a volume body having a lower portion integrally formed therewith;
A cell receiver in which a solar cell is mounted and a pair of output terminals are installed;
A heat dissipation block to which the cell receiver is fixed; And
A solar cell assembly comprising a heat pipe buried so as to be exposed to the surface of the heat dissipation block in contact with the cell receiver. The method according to claim 7 or 8,
The cell receiver is bonded to the heat dissipation block by a heat dissipation adhesive, or one end is fixed to the heat dissipation block and the other end is fixed to the heat dissipation block by an insulation clamp for pressing the cell receiver.
When fixed by the insulating clamp, the solar cell assembly, characterized in that the heat dissipation grease is interposed between the cell receiver and the heat dissipation block. The method according to claim 7 or 8,
Grooves are formed in the heat dissipation block so that the heat pipes are embedded, and heat dissipation grease or heat dissipation adhesive is applied to an inner surface of the grooves. The method according to claim 7 or 8,
The heat pipe is a solar cell assembly, characterized in that the cross-section is deformed by the pressurized portion is in contact with the cell receiver is a plane. The method according to claim 7 or 8,
The cell receiver and the heat dissipation block portion adjacent thereto are covered by a protective layer,
The protective layer is a solar cell assembly, characterized in that formed by coating or spraying silicone resin, urethane resin, phenol resin, epoxy resin, or enamel. The method according to claim 7 or 8,
The heat dissipation block is composed of a body and a heat dissipation fin integrally formed, the heat dissipation fin extends radially from the body,
Both edges are formed in a saw blade shape in the vertical cross section of the heat dissipation fin, and the solar cell assembly, characterized in that the branches (protrusion) formed at a predetermined interval on both edges. The method according to claim 7 or 8,
It further includes a support member bent in an inverted U shape to support the light collecting unit,
Both ends of the support member are fixed to the heat dissipation block, and a through hole is formed in the middle portion of the support member to fit the light converging unit.
And the first and second light collecting parts are independently fixed to the support member at the boundary of the first and second light collecting parts. The method according to claim 14,
And the first condenser is fitted or riveted to the support member, and the second condenser is press-fixed and fixed by at least one pair of support pieces bent from the through hole. The method according to claim 7 or 8,
The surface of the heat dissipation block is an anodizing treatment to prevent surface oxidation due to weathering, fluorine coating, Teflon coating or ceramic coating, characterized in that the ceramic coating. The method according to claim 7 or 8,
The bottom surface of the second light collecting portion is the size of the solar cell assembly, characterized in that the same as the size of the cell. The method according to claim 7 or 8,
The top surface of the second light collecting portion is characterized in that the anti-reflective coating (Anti Reflect) coating.

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