WO2014069678A1 - Secondary optical element having carrier protecting function and concentrating solar cell module comprising same - Google Patents

Abstract

The present invention relates to a secondary optical element having a carrier protecting function and a concentrating solar cell module comprising the same and, more particularly, to a secondary optical element having a carrier protecting function and a concentrating solar cell module comprising the same, wherein the secondary optical element seals a carrier by being provided on the upper part of the carrier, and secondarily concentrates light concentrated in a primary optical element onto a solar cell and at the same time, the secondary optical element can prevent damage to a carrier (or receiver) caused by off-axis light of the primary optical element.

Description

Secondary optical component having carrier protection and condensing solar cell module having same

The present invention relates to a secondary optical component having a carrier protection function and a light concentrating solar cell module having the same, specifically, provided on the carrier to seal the carrier, and to collect the light collected from the primary optical component. A secondary optical component and a light collecting type having the secondary optical component capable of condensing into the cell at the same time and preventing damage to a carrier (or receiver) by off-axis light from the primary optical component. It relates to a solar cell module.

Recently, photovoltaic (PV) devices using photovoltaic (PV) are widely used. In particular, photovoltaic devices using silicon solar cells are mainly used.

However, with the rapid development of high-efficiency III-V compound semiconductor multi-junction solar cell, concentrating photovoltaic, CPV) devices are actively being researched.

Multi-junction solar cells have higher energy conversion efficiencies compared to silicon solar cells. In general, multi-junction solar cells have more than 35% energy efficiency, while silicon solar cells are about 20% efficient. Has Particularly under concentration, some multi-junction solar cells now have energy efficiency of over 40%.

The condensing solar cell module using the multi-junction solar cell is a solar cell, a primary lens for condensing sunlight primarily, and a secondary lens for condensing light condensed from the primary lens to the solar cell. The solar cell is mounted on a carrier or receiver such as a circuit board.

However, since the efficiency and product life of the multi-junction solar cell used in the light concentrating solar cell module are very vulnerable to moisture, it is necessary to seal the solar cell in order to improve the efficiency and extend the product life. Conventionally, a method of applying and sealing silicon when a multi-junction solar cell is mounted on a cell mount or a receiver has been used. However, coating and sealing a solar cell with silicon has a problem of dissipating heat generated from the solar cell by condensing due to the low thermal conductivity of the silicon material, and this problem acts as a factor to lower the efficiency of the solar cell. . In addition, silicon has a problem that the transmission efficiency of incident solar light is significantly decreased when exposed to ultraviolet light of the solar light for a long time, thereby reducing the light transmitted to the solar cell has a problem of reducing the efficiency of the photovoltaic device.

In order to solve this problem, the conventional condensing type solar cell module may further include a receiver housing that covers and seals the receiver provided with the solar cell, and if the configuration for sealing the solar cell is further provided, the manufacturing cost Not only does this increase, but there is a problem that the manufacturing process becomes complicated.

On the other hand, the light concentrating solar cell module is composed of a plurality of solar cells in the form of an array in the support frame, in order to improve the efficiency of the solar cell requires a tracking device to keep the module orthogonal to the sun. Therefore, the design of such a concentrating solar cell module maintains orthogonality to the sun, so that the sunlight is incident vertically to the primary lens under the condition that the sunlight is incident to the primary lens in a vertical state. It is made to be condensed by the battery, due to various reasons such as manufacturing error of the module, the error of the tracking device, there is sunlight that does not vertically incident to the primary lens, such solar light is not collected by the solar cell module A problem arises by condensing on various components in the interior and causing damage to the components.

The present invention is to solve the above problems, is provided on the carrier to seal the carrier, and to collect the light collected in the primary optical component secondary to the solar cell and at the same time off from the primary optical component A secondary optical component capable of preventing damage to a component, in particular a carrier (or receiver) by off-axis light, and a light collecting solar cell module having the same are provided.

In addition, the present invention provides a light concentrating solar cell module that can easily combine a secondary optical component having a carrier protection function with a module having easy stiffness and easy to manufacture and assemble.

The secondary optical component having a carrier protection function according to the present invention collects light condensed from a primary optical element secondary to a solar cell provided in a carrier. A secondary optical element for a solar cell module, comprising: a cover portion covering and sealing the carrier; A secondary lens unit extending downward from the center of the cover part to focus the light incident on the primary optical component and to focus the light incident on the center of the cover part to the solar cell by internal reflection; And an inner side surface that reflects or totally reflects light directly incident to prevent the light that is collected by the primary optical component from entering the cover part and which does not enter the secondary lens part from being incident on the carrier. Can be done.

In addition, the light collecting solar cell module according to the present invention includes a frame; A carrier having a solar cell; A primary optical element provided above the frame to primaryly collect incident light; And an upper portion of the carrier to seal the carrier, and secondly collect light collected by the primary optical component into the solar cell, and the light collected by the primary optical component is incident to the carrier. And a secondary optical component to prevent it.

Wherein the secondary optical component comprises: a cover portion covering and sealing the carrier; A secondary lens unit extending downward from the center of the cover part to focus the light incident on the primary optical component and to focus the light incident on the center of the cover part to the solar cell by internal reflection; And an inner side surface that reflects or totally reflects light directly incident to prevent the light that is collected by the primary optical component from entering the cover part and which does not enter the secondary lens part from being incident on the carrier. Can be done.

According to the secondary optical component and the concentrating solar power module according to the present invention having the configuration as described above, since the separate configuration for sealing the carrier (or receiver) is not necessary, the overall configuration of the module can be simplified. There is.

In addition, according to the secondary optical component and the concentrating solar cell module according to the present invention, the light off-axis in the primary optical component is focused on various components of the module rather than being concentrated by the solar cell Damage to the generated parts can be prevented, and in particular, there is an effect that can prevent damage to the carrier (or receiver).

In addition, the light concentrating solar cell module according to the present invention has an effect of easily coupling a secondary optical component having a carrier protection function to a module having its own stiffness and easy to manufacture and assemble. .

1 is a perspective view showing a light collecting solar cell module according to an embodiment of the present invention;

2 is a partial vertical cross-sectional view in the horizontal direction of the light collecting solar cell module of FIG. 1,

3 is a partial vertical cross-sectional view in the vertical direction of the light collecting solar cell module according to FIG. 1,

4 is a view schematically showing a state in which carriers are arranged on a lower plate of a light collecting solar cell module according to an embodiment of the present invention;

5 is an enlarged view of a portion 'A' of FIG. 2;

FIG. 6 is an enlarged view of a portion 'B' of FIG. 2;

7 is a perspective view showing a wire cover according to an embodiment of the present invention,

8 is a perspective view showing a carrier frame according to an embodiment of the present invention,

9 is a cross-sectional view of a secondary optical component according to an embodiment of the present invention;

10 is a diagram for explaining condition 1 and condition 2;

11 is a cross-sectional view of a secondary optical component according to another embodiment of the present invention.

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

While the invention allows for various modifications and variations, specific embodiments thereof are illustrated by way of example in the drawings and will be described in detail below. However, it is not intended to be exhaustive or to limit the invention to the precise forms disclosed, but rather the invention includes all modifications, equivalents, and alternatives consistent with the spirit of the invention as defined by the claims.

In addition, the thickness and size in the accompanying drawings are exaggerated for clarity of the specification, the present invention is not limited by the relative size or thickness shown in the accompanying drawings.

On the other hand, relative terms such as "vertical direction" and "landscape direction" in this specification can be used to describe the relationship between the components based on the direction shown in the drawings, the present invention is not limited by such terms.

The present invention relates to a secondary optical component having a carrier protection function and a light concentrating solar cell module having the same, the secondary optical component according to the present invention is provided on the carrier to seal the carrier, and the primary optical configuration. It has a carrier protection function that condenses light collected at the element into a solar cell, while simultaneously preventing damage to the carrier (or receiver) by off-axis light at the primary optical component.

1 is a perspective view illustrating a light collecting solar cell module according to an embodiment of the present invention, FIG. 2 is a partial vertical cross-sectional view in the horizontal direction of the light collecting solar cell module according to FIG. 1, and FIG. 3 is a light collecting unit according to FIG. 1. Partial vertical cross-sectional view of the vertical solar cell module.

1 to 3, the light collecting solar cell module 10 according to the embodiment of the present invention has a frame composed of a side plate and a lower plate 30, and a solar cell 11 at an upper portion thereof. Primary optical component (Primary) is provided on the lower plate 30, the carrier (12) is provided at a predetermined interval, the primary optical component that primarily collects the incident light to the solar cell 11 provided on the frame Optical Element, POE (20), provided between the primary optical component 20 and the solar cell 11 to collect the light collected in the primary optical component 20 secondary to the solar cell (11) It may comprise a secondary optical element (SOE) (100).

The frame is made long in the longitudinal direction (or longitudinal direction), is provided to have rigidity (stiffness) by itself, and may be formed in the form of an upper side formed of a side plate and a lower plate 30.

The side plate may be composed of a horizontal plate 25 made short in the horizontal direction, and a vertical plate 50 made longer in the vertical direction than the horizontal plate 25. For example, the length L1 of the vertical plate 50 may be about 5 to 10 times longer than the length L2 of the horizontal plate 25, and the height H of the vertical plate 50 is the length. It may be approximately 1/20 to 1/10 times longer than L1. The vertical plate 50, the horizontal plate 25, and the lower plate constituting the frame are preferably made of aluminum, which is light and has excellent thermal conductivity.

The secondary optical component 20 is configured to condense the incident solar light provided on the frame to the solar cell 11, and may be configured in the form of a lens plate as shown in the drawing. A plurality of pattern portions 22 may be provided to collect incident sunlight into each of the plurality of solar cells 11, and the pattern portions 22 may be provided in the form of a Fresnel lens.

In addition, the light collecting solar cell module 10 according to the present invention is provided on the lower plate 30, the carrier frame 60, a plurality of carriers 12 are provided on the upper side at a predetermined interval in parallel or It may further comprise a wire (13) for connecting in series, a wire cover (wire cover) 70 covering the wire (13).

The solar cell 11 is a configuration for converting solar energy into electrical energy, and a high efficiency III-V compound semiconductor multi-junction solar cell may be used, and the carrier 12 may include other components on a circuit board. In addition, the solar cell 11 is mounted, and may be a receiver generally used in the technical field to which the present invention pertains. That is, in the present invention, the carrier 12 is a configuration in which the solar cell 11 is provided on the circuit board, and the embodiment may be configured in various forms, and the receiver is used as a generic term. In addition, a plurality of carriers 12 are provided in the lower plate 30 at predetermined intervals, and a carrier 12 is provided with a connector such that these connectors are electrically connected in parallel or in series by wires 13. The plurality of carriers 12 may be connected to each other.

The length of the frame is long in the longitudinal direction, but the longitudinal plate 50 is formed in the vertical direction to have a stiffness itself (stiffness) can be formed with a plurality of ribs to enhance the rigidity, the plurality of ribs are radiating ribs At least one of the 51 and the reflective ribs 52 may be included.

The heat dissipation rib 51 is formed on the outer surface of the vertical plate 50 to improve the rigidity of the vertical plate 50 and at the same time increase the contact area with the outside to occur inside the sealed frame to the vertical plate 50. The transferred heat is smoothly conducted to the outside and discharged.

Reflective ribs 52 protrude below the inner surface of the longitudinal plate 50 to enhance the rigidity of the longitudinal plate 50 and at the same time off-axis in the primary optical component 20. The light S1 is reflected to prevent the light S1 from entering the component such as the wire 13. The off-axis solar light S1 does not receive sunlight vertically to the primary optical component 20 due to various factors such as manufacturing error of the module 10 and error of the tracking device. In this case, the reflective rib 71 together with the wire cover 70 is for preventing damage to the wire 13 by such off-axis sunlight S1.

The vertical plate 50 is preferably made of a heat dissipation rib 51 and the reflective ribs 52 are integrally formed by extrusion molding in a longitudinal direction in a longitudinal direction. Then, since the vertical plate 50 having the cross section as described above may be manufactured integrally by extrusion molding to assemble the frame, manufacturing and assembly may be easily performed.

A coupling rib 26 for screwing the vertical plate 50 may be protruded on the inner side or the outer side of the horizontal plate 25, and the coupling rib 26 improves the rigidity of the horizontal plate 25. And at the same time to facilitate the screw coupling with the vertical plate (50). Preferably, the coupling rib 26 may be elongated in the horizontal direction in a predetermined vertical section so that the horizontal plate 25 may be integrally formed by extrusion molding.

The lower plate 30 has a predetermined width in the vertical direction, and may be composed of a plurality of piece lower plates 31 arranged in the vertical direction and joined, and each of the plurality of piece lower plates 31 is a vertical plate. 50 may be screwed to the bottom, it may be made of a length corresponding to the length of the horizontal plate (25).

The lower plate 31 is provided with a heat dissipation rib 32 protruding from the lower portion, and a coupling rib 34 protruding from the upper portion to form a fastening portion 33 for screwing the vertical plate 50. Can be.

Sculpture lower plate 31 may be improved in rigidity by the heat dissipation rib 32 and the coupling rib 34, the area in contact with the outside by the heat dissipation rib 32 is widened to occur inside the sealed frame The heat transferred to the lower plate 31 can be smoothly conducted to the outside to be discharged. In addition, by forming the fastening portion 33 for screwing the vertical plate 50 on the coupling rib 34, the fastening portion 33 can be easily formed on the lower plate 31 made of a thin plate.

The secondary optical component 100 is provided on the carrier 12 to seal the carrier 12, and secondary light condensed light from the primary optical component 20 to the solar cell 11 and At the same time it has a carrier 12 protection function which prevents damage to the carrier 12 by off-axis light in the primary optical component 20. Therefore, since the module 10 according to the present invention does not need to further include a separate configuration for sealing the solar cell 11 and the carrier 12, the overall configuration can be simplified. Details of the secondary optical component 10 according to the present invention will be described later.

4 is a view schematically showing a state in which a carrier is arranged on a lower plate of a light collecting solar cell module according to an embodiment of the present invention.

Referring to FIG. 4, the carrier 12 includes a horizontal array 122 in which a plurality of carriers 12 are arranged at predetermined intervals in a horizontal direction, and a vertical direction in which a plurality of such horizontal arrays 122 are arranged in a vertical direction. It may be provided in the form of an array 124, the plurality of carriers 12 are connected to each other by a wire (13).

For example, the plurality of carriers 12 forming the horizontal array 122 may be connected by horizontal connecting wires 132 connecting in a horizontal direction, and the connection between the vertical arrays 124 may be one horizontal. The carrier 12 positioned at the end of the directional array 122 may be connected by a vertical connection wire 132 connecting the carrier 12 positioned at the end of the other horizontal array 122 adjacent thereto. In this case, the horizontal connecting wire 132 may be protected by the wire cover 70, but because the vertical connecting wire 132 is located at one end of the module 10 to combine the wire cover 70 on the assembly structure. Therefore, a separate protection method for protecting the vertical connection wires 132 is required, and the module 10 according to the present invention has a reflective rib 71 that protrudes long under the inner surface of the vertical plate 50. By providing the stiffness of the vertical plate 50 and at the same time to protect the vertical connection wire 132.

5 is an enlarged view of a portion 'A' of FIG. 2, FIG. 6 is an enlarged view of a portion 'B' of FIG. 2, FIG. 7 is a perspective view showing a wire cover according to an embodiment of the present invention, and FIG. 8 is shown. A perspective view showing a carrier frame according to an embodiment of the present invention.

5 to 8, the carrier frame 60 may be fixedly coupled to an upper portion of the lower plate 25 by the wire cover 70.

In order to effectively dissipate heat generated from the solar cell 11, the carrier frame 60 is preferably made of an aluminum material which is light and has excellent thermal conductivity as well as the lower plate 30. When the frame 60 is made of the same metal material as the lower plate 30, a separate configuration for coupling and fixing the carrier frame 60 to the lower plate 30 is required. However, when the carrier frame 60 is fixed to the upper portion of the lower plate 30 by using a separate screw or the like, the structure becomes complicated and the assembly process becomes complicated.

Therefore, the module 10 according to the present invention may be provided to secure the carrier frame 60 when the wire cover 70 for protecting the wire 13 is coupled to the upper portion of the lower plate 30. . That is, the wire cover 70 is provided on the lower plate 30 so as to cover the wire 13, and may be coupled to the lower plate 30 while the carrier frame 60 is fixed.

In detail, the wire cover 70 extends downward from one side (eg, the end of the upper plate 72) of the upper plate 72 covering the wire 13 and the upper plate 72, and lower plate 30. A first distance from the other side of the upper plate 72 (for example, the end of the upper plate 72) to be located inside the first leg portion 74 and the first leg portion 74 coupled to And a second leg 76 extending downward in a spaced apart position).

In addition, the second leg portion 76 is provided to compress the carrier frame 60 when the first leg portion 74 is coupled to the lower plate 30, for example, the second leg portion 76 When the first leg 74 is coupled to the lower plate 30, the first leg 74 may be shorter than the length of the first leg 74 to compress the carrier frame 60. Preferably, the second leg 76 may be formed to be inclined at a predetermined angle to have a predetermined elastic force in the direction in which the carrier frame 60 is pressed. More preferably, the second leg 76 may face each other. Consisting of a pair, the pair of second legs 76 may be formed in a direction that opens toward each other downward. Then, the second leg portion 76 has a stronger elastic force in the direction in which the carrier frame 60 is pressed, so that when the first leg portion 74 is coupled to the lower plate 30 more firmly the carrier frame ( 60) can be fixed. In addition, an end 77 having a round cross section may be formed at the end of the second leg 76 so as to smoothly press the carrier frame 60.

The lower plate 30 may be formed of a plurality of pieces of the lower plate 31 which are arranged in the longitudinal direction as described above to combine, the upper portion of the lower plate 31, the seating portion on which the carrier frame 60 is seated ( 36 is formed long in the longitudinal direction, the engaging projection 38 to which the wire cover 70 is coupled to the outside of the seating portion 36 may protrude.

In addition, the carrier frame 60 may be made long in the horizontal direction to be seated in the seating portion 36 is formed in the horizontal direction, a plurality of carriers 12 arranged in the horizontal direction on the carrier frame 60 At least two or more carriers 12 may be provided. The carrier 12 may be attached to the carrier frame 60 by a sealing material such as silicon while the solar cell 11 is provided thereon.

A locking jaw 39 may be formed at an end of the coupling protrusion 38 to extend to the outside, and one side of the first leg portion 74 of the wire cover 70 (eg, the first leg portion 74). At the inner side of the end portion thereof, a locking portion 75 may be formed to be locked to the locking jaw 39.

Accordingly, the upper plate 72 of the wire cover 70 covers and protects the wire 13 (eg, the horizontal connection wire 132) connecting the plurality of carriers 12 arranged in the horizontal direction at predetermined intervals. The wire cover 70 is coupled to the lower plate 31 by the locking portion 75 of the first leg portion 74 by the locking jaw 39, and the second leg portion 76 is When the locking portion 75 is caught by the locking jaw 39, the carrier frame 60 is compressed.

Meanwhile, the carrier frame 60 may include a heat pipe 62 provided therein. The heat pipe 62 may have a closed loop shape, the refrigerant may be accommodated in the heat pipe 62, and the evaporation unit to which the refrigerant evaporates by the heat generated by the solar cell 11 and the evaporated refrigerant condense. Condensation unit may be provided, but the detailed configuration of the heat pipe 62 can be easily implemented by those skilled in the art, detailed description thereof will be omitted, The present invention is not limited by the specific configuration of the heat pipe 62.

In addition, the carrier frame 60 is made long in the longitudinal direction, the receiving groove 64 may be formed long in the longitudinal direction so that the plurality of carriers 12 are arranged in a line at a predetermined interval thereon.

Therefore, the module 10 according to the present invention does not need to fix each of the plurality of carriers 12 separately, so that only the carrier frame 60 may be fixed using the wire cover 70, so that the overall assembly may be very simple and easy. have. In addition, by providing a heat pipe 62 for dissipating heat generated from the solar cell 11 inside the carrier frame 60, a separate apparatus for dissipating heat does not need to be assembled separately. The heat pipe 62 for dissipating the heat generated in the module 10 can be easily assembled and integrated.

On the other hand, the wire cover 70 is preferably provided to secure the secondary optical component 100 when coupled to the lower plate 30, for this purpose, the wire cover 70 is the upper plate 72 It further comprises a third leg 78 extending downward from one side of the first leg portion 74 to compress the flange 115 of the secondary optical component 100 when the first leg portion 74 is coupled to the lower plate 30 It can be done by. The third leg 78 may compress the flange 115 of the secondary optical component 100 when the locking portion 75 of the first leg 74 is caught by the locking jaw 39. It may be formed shorter than the first leg portion 74 and / or the second leg portion 76.

In addition, the lower plate 31 is preferably formed integrally by extrusion molding like the horizontal plate 25 and the vertical plate 50, for this purpose, the heat dissipation rib 32, the coupling rib 34, the seating portion 36 ) And the engaging projection 38 is preferably made long in the transverse direction with a constant cross-section. Then, the piece lower plate 31 having the cross section as described above is integrally manufactured by extrusion molding, and then cut to the required length to assemble the frame, so manufacturing and assembly can be easily performed.

Hereinafter, the secondary optical component 100 according to the present invention will be described in detail with reference to the accompanying drawings.

9 is a cross-sectional view illustrating a secondary optical component according to an embodiment of the present invention. Referring to FIG. 9, the secondary optical component 100 according to an exemplary embodiment of the present invention may include a cover 110, a secondary lens unit 120, and an inner surface 130.

The cover unit 110 is configured to cover and seal the carrier 12. The cover unit 110 is provided to cover the carrier 12 (or the receiver) having the solar cell 11 mounted thereon together with other components on the circuit board. In the state in which the carrier 12 is covered, the bottom edge is sealed to seal the carrier 12.

A predetermined space 111 may be provided inside the cover 110, and the overall shape of the cover 110 may be formed in a semispherical shape. Of course, the overall shape of the cover portion 110 may be made of a shape other than a hemispherical shape, for example, the shape of the cross section of the outer surface is aspherical, the present invention is not limited thereto.

The secondary lens unit 120 extends downward from the center portion 112 of the cover portion 110, is condensed by the primary optical component 20, and is incident on the center portion 112 of the cover portion 110. Is condensed into the solar cell 11 by internal total reflection. That is, the secondary lens unit 120 is condensed from the primary optical component 20 and the light S2 that is normally focused among the light incident on the cover 110 is uniformly distributed to the solar cell 11 to condense. It is a configuration that performs the function as a homogenizer.

To this end, the secondary lens unit 120 has an incident surface 121 corresponding to the central portion 112 of the cover portion 110 to which the light collected from the primary optical component 20 is incident, and the incident surface 121. A side surface 122 through which light incident to the front side is totally reflected, and an exit surface 123 through which light incident to the incident surface 121 and the light totally reflected from the side surface 122 are emitted may be provided.

In addition, as shown in the figure, the cross-section of the secondary lens unit 120 is generally made of a taper shape that narrows from the top to the bottom, which is the light collected from the primary optical component 20 is 2 This is to focus the solar cell 11 as it is totally reflected from the side surface 122 of the vehicle lens unit 120, and in particular, by increasing the number of total reflections from the side surface 122 of the secondary lens unit 120. 11) to uniformly distribute the incident light. However, the shape of the secondary lens unit 120 is not limited to the tapered shape, and the side surface 122 of the secondary lens unit 120 may be formed in a curved shape as well as a straight line shape. The shape of the secondary lens unit 120 may be formed in various shapes having a shape in which the width of the exit surface 123 is smaller than the width of the incident surface 121. In addition, the shape of the horizontal cross-section of the secondary lens unit 120 may be formed as a quadrangle, a triangle, more polygons or a circle, and may also be a shape in which the size or / and shape of the cross section is changed.

The inner surface 130 is focused on the primary optical component 20 and the light S3 which is not incident on the secondary lens unit 120 among the light incident on the cover 110 is incident on the carrier 110. It is a structure to prevent that.

The outer surface of the cover unit 110 may be an incident surface to which the light primarily collected by the primary optical component 20 is incident. In this way, the cover unit 110 is collected by the primary optical component 20. If all the light incident on the outer surface of the light incident on only the central portion 112 of the cover 110, almost all the light collected in the primary optical component 20 is the solar cell 11 through the secondary lens unit 120 Can be collected. In practice, however, there may be light that does not vertically enter the primary optical component 20 due to various reasons such as manufacturing error of the module 10, error of the tracking device, and the like. At 20, the light beams are focused in a state in which they deviate from the optical axis, that is, in an off-axis state, and the off-axis light S3 is centered at the center portion 112 of the cover 110. The incident light is incident on the peripheral portion 113, and the light is not incident on the secondary lens part 120, but is incident directly on the carrier 12 positioned inside the cover part 110 (S4). It causes the damage of various components provided in the carrier 12. However, in order to solve this problem, a method such as a separate member or coating in the region of the peripheral portion 113 except for the region of the central portion 112 incident on the outer surface of the cover portion 110 as the secondary lens unit 120. If the reflective face is further configured, this is not preferable because it causes an increase in manufacturing cost and complexity and difficulty of the manufacturing process. When considering the manufacturing cost and manufacturing process, the secondary optical component 100 is preferably one-body molded from a transparent material without additional processes such as a process for bonding a separate member or a coating process. to be. Here, as the transparent material, glass, acrylic (Methylmethacrylate), PMMA (Polymethylmethacrylate), PC (Polycarbonate), PET (Poly Ethylen Terephthalate), or the like, which are transparent materials having excellent light transmittance, may be used.

Accordingly, the secondary optical component 100 according to the present invention is off-axis to solve the problem caused by the off-axis light S3 while being integrally formed without additional members or processes. The inner surface 130 is configured to reflect the light S3). Here, the off-axis light S3 may be defined as light that is not normally collected and cannot directly enter the secondary lens unit 120 and thus directly enter the inner surface 130. For example, the off-axis light S3 may be light that does not enter the central portion 112 of the cover portion 110 but enters the peripheral portion 113 and directly enters the inner surface 130. Or, even though incident to the central portion 112 of the cover 110, the incident angle (θ) formed with the optical axis 101 is very large and does not enter the secondary lens unit 120, but directly enters the inner surface 130 It may be light.

Accordingly, the inner surface 130 of the secondary optical component 100 reflects the light S3 that is directly collected from the primary optical component 20 and is incident on the outer surface of the cover 110. Or total reflection. In addition, the inner surface 130 may be provided to reflect light S3 directly incident by a coating method, but is designed to satisfy the following condition 1 and is optically designed to totally reflect light S3 directly incident. This is preferred.

Condition 1: Δα> sin ^-1 (1 / n) + sin ^-1 (sinθ ₁ / n)

(However, Δα: within any slope of the tangent at the point (P1) of the on the side (130), θ _1: incident angle incident on the first optical components (the condenser 20), the cover portion (110) (θ) When light is defined as an angle formed with the virtual reference axis 102 parallel to the optical axis 101 of the secondary optical component 100, the light S3 directly incident on the inner surface 130 is covered by the cover 110. Angle of incidence at which n is the refractive index of the material forming the secondary optical component 100)

In general, in the design of the module 10, an off-axis light S3 as an error range of the light S2 that is normally focused in consideration of an error of solar light, a manufacturing error of the module 10, an error of a tracking device, and the like. Since the range of) is determined according to the design purpose of the module 10, the total reflection condition of the inner surface 130 is determined by the incident angle of the light S3 directly incident on the off-axis light, that is, the inner surface 130. ₁ , optical design of the inner surface 130 may be enabled. Detailed description of the condition 1 will be described later.

On the other hand, the secondary optical component 100 according to an embodiment of the present invention further comprises an emission surface 140 for emitting the light (S5) reflected or totally reflected from the inner surface 130 to the outside of the cover portion 120. It can be made, including.

As shown in the figure, even if the off-axis light S3 is reflected or totally reflected on the inner surface 130, it is reflected or totally reflected again on the outer surface of the cover portion 110 to cover the cover portion 110. It may be incident inward (S6), which in turn causes damage to various components provided in the carrier 120.

Accordingly, the secondary optical component 100 according to the embodiment of the present invention emits light so as to reliably emit the light S5 reflected or totally reflected from the inner surface 130 to the outside of the cover 110. The surface 140 is configured. The emission surface 140 may be configured to satisfy the following condition 2 and may be optically designed to emit light S5 reflected or totally reflected from the inner surface 130 to the outside of the cover 110.

Condition 2: Δβ> 2 x Δα-sin ^-1 (1 / n)-sin ^-1 (sinθ ₁ / n)

(However, Δβ: inclination of the tangent line at any point P2 on the emission surface 140, θ ₁ : the incident angle at which light S3 incident directly on the inner surface 130 is incident on the cover 110, n: refractive index of the material constituting the secondary optical component 100)

As described above, the optical design of the inner surface 130 is possible according to the range of off-axis light S3, and thus, the optical design of the emission condition of the emission surface 140 is possible as described above. Can be done. Detailed description of the condition 2 will be described later.

On the other hand, the secondary optical component 100 according to an embodiment of the present invention may be further provided with a flange (102) extending to the outermost portion of the cover portion 110, in this case 2 As described above, the light blocking component 100 may be easily and firmly coupled to the module 10 by the third leg 78 of the wire cover 70 that compresses the flange 115.

In addition, the secondary optical component 100 may further include a passage 114 through which wires 13 for connecting the plurality of carriers 12 pass on one side of the cover 110. The passage part 114 may be provided in the form of a groove at the outermost edge end of the cover part 110, or may be provided in the form of a hole at a predetermined position of the cover part 110. In addition, the passage part 114 may be sealed by a sealing material such as silicon after connecting the wires 13, so that the inside of the cover part 110, that is, the space 111 in which the carrier 12 is accommodated, may be sealed. It becomes possible.

In addition, the depth of the accommodating groove 64 in which the carrier 12 provided on the carrier frame 60 is accommodated may be the same as the sum of the thickness of the carrier 12 and the thickness of the solar cell 11. have. Then, the secondary optical component 100 may be provided with the bottom of the outermost portion 116 of the cover 110 and the bottom of the secondary lens portion 120, that is, the exit surface 123 substantially horizontal. In this way, the manufacture of the secondary optical component 100 can be easily achieved.

The lowermost part 116 of the outermost part of the cover part 110 is a part which is in contact with the lower plate 30 or / and the receiver frame 60 and is sealed by a sealing material, and the lower part of the secondary lens part 120 ( 123 is a portion which is in contact with the solar cell 11, the lower end 123 of the secondary lens unit 120 is provided on the carrier 12 and the carrier 12 provided on the receiver frame 60. Due to the thickness of the solar cell 11 is to be made shorter than the bottom of the outermost portion 116 of the cover 110 can not be provided in a substantially horizontal state, which is integral with the secondary optical component 100 To form a lot at a time to give a lot of difficulties, for example, the height of the bottom 116 of the outermost portion of the cover 110 and the bottom 123 of the secondary lens unit 120 to the same horizontally Inconvenient to shorten by processing the lower end 123 of the secondary lens unit 120 in a separate process The. However, this problem can be easily solved by having the depth of the receiving groove 64 equal to the thickness of the thickness of the carrier 12 and the thickness of the solar cell 11 as described above.

The above-described conditions 1 and 2 will be described in detail with reference to the drawings.

10 is a diagram for explaining condition 1 and condition 2. FIG.

Referring to FIG. 10, the refractive index of the material constituting the secondary optical component 100 is n, and the incident angle and the refraction angle of the light condensed by the primary optical component 20 and incident on the cover 110 are secondary optical components. An angle of incidence of light S3 incident directly to the inner surface 130 is incident on the cover 110 when defined as an angle formed with an imaginary reference axis 102 parallel to the optical axis 101 of the element 100. When θ ₁ and the light S3 is refracted by the cover part 110 are θ ₂ , the following equation is satisfied.

sinθ ₁ = n × sinθ ₂

Further, the inclination angle θ at which the inclination of the tangent 103 at any point P1 on the inner surface 130 is incident to the inner surface 130 by the light S3 incident directly on the inner surface 130. _{If T1} ) is defined as an angle formed with the normal 104 with respect to the tangent 103, the following equation is satisfied.

θ _T1 = Δα-θ ₂

In this case, in order for the light S3 incident directly on the inner surface 130 to be totally reflected on the inner surface 130, the following conditions must be satisfied.

n × sinθ _T1 〉 1

Therefore, if the above conditions are summarized using the above equations, condition 1 as described above can be obtained. That is, condition 1 is an optical condition for total reflection of the light S3 directly incident on the inner surface 130. In addition, the shape of the inner surface 130 may be made of a curve or a straight line, the present invention is not limited thereto. For example, FIG. 10 shows an example in which the shape slope Δα of the inner side surface 130 is not constant. As shown in FIG. 9, the inner side surface 130 may have an arbitrary point P1 on the inner side surface 130. The inclination α of the tangent line at) may be in the form of a constant inclined surface.

Meanwhile, the inclination angle of the tangent 105 at an arbitrary point P2 on the emission surface 140 is Δβ, and the incident angle θ _T2 at which the light S5 totally reflected from the inner surface 130 is incident on the inclined surface 140. If is defined as the angle formed by the normal line 106 with respect to the tangent 105, the following equation is satisfied.

θ _T2 = 2 × Δα-Δβ-θ ₂

In this case, in order for the light S5 that is totally reflected from the inner surface 130 to be incident on the emission surface 140 to be emitted from the emission surface 140 to the outside of the cover 110, the following conditions must be satisfied.

n × sinθ _T2 〈1

Therefore, by arranging the conditions using the above equations, condition 2 as described above can be obtained. That is, condition 2 is an optical condition for emitting the light S5 that is totally reflected from the inner surface 130 by the emission surface 140 to the outside of the cover 110. In addition, like the inner side surface 130, the shape of the exit surface 140 may be formed of a curved line or a straight line, the present invention is not limited thereto. For example, FIG. 10 shows an example in which the shape slope Δβ of the exit surface 140 is not constant. As shown in FIG. 9, the exit surface 140 may have any point P2 on the exit surface 140. The angle of inclination β at) may be in the form of a constant inclined surface.

11 is a cross-sectional view illustrating a secondary optical component according to another exemplary embodiment of the present disclosure.

As shown in FIG. 11, the secondary optical component 150 according to the present exemplary embodiment has a convex shape such that the central portion 112 and the peripheral portion 113 of the cover portion 110 are clearly distinguished in structure. Peripheral portion 113 may be formed in a flat shape, and the side of the cover 110 is made of an inclined surface having the same slope as a whole, the entire side may be provided to enable the function of the exit surface 150, The inner side surface 140 may also be formed of an inclined surface having the same slope as a whole.

As described above, the present invention relates to a secondary optical component having a carrier protection function and a light converging solar cell module having the same, and embodiments thereof may be modified in various forms. Therefore, the present invention is not limited to the embodiments disclosed in the present specification, and all forms changeable by those skilled in the art to which the present invention pertains will belong to the scope of the present invention.

Claims (16)

Secondary optical element for a condensing solar cell module for condensing light collected by a primary optical element secondary to a solar cell provided in a carrier To A cover part covering and sealing the carrier; A secondary lens unit extending downward from the center of the cover part to focus the light incident on the primary optical component and to focus the light incident on the center of the cover part to the solar cell by internal reflection; And And an inner side surface reflecting or totally reflecting light that is directly incident to the carrier to prevent the light that is collected by the primary optical component from entering the cover part and not incident to the secondary lens part. Secondary optical component for a light collecting solar cell module, characterized in that. The method of claim 1, The inner side surface is a secondary optical component for a light collecting solar cell module, characterized in that configured to satisfy the following condition 1 to totally reflect the light directly incident. Condition 1: Δα> sin ^-1 (1 / n) + sin ^-1 (sinθ ₁ / n) (However, Δα: slope, θ ₁ of the tangent at any point on the inner surface of the: optical axis of said first optical components are collected at the element the light incident angle (θ) of incident parts of the cover the second optical component and Angle of incidence where the direct incident light is incident on the cover part when defined as an angle formed with a parallel virtual reference axis, n: refractive index of a material forming the secondary optical component) The method of claim 2, The inner side surface is a secondary optical component for a light concentrating solar cell module, characterized in that the inclination of the tangent line (Δα) at any point on the inner surface in the form of a constant slope. The method of claim 1, The secondary optical component for a light collecting solar cell module, characterized in that further comprising an emission surface for emitting the light reflected or totally reflected from the inner surface to the outside of the cover portion. The method of claim 4, wherein The emission surface is a secondary optical component for a light collecting solar cell module, characterized in that provided on the outer edge portion of the cover portion. The method of claim 4, wherein The inner surface is configured to satisfy the following condition 1 to totally reflect the directly incident light, and the exit surface is configured to satisfy the condition 2 to emit the light totally reflected from the inner surface to the outside of the cover part. Secondary optical component for a light collecting solar cell module, characterized in that. Condition 1: Δα> sin ^-1 (1 / n) + sin ^-1 (sinθ ₁ / n) Condition 2: Δβ> 2 x Δα-sin ^-1 (1 / n)-sin ^-1 (sinθ ₁ / n) Where Δα is the slope of the tangent line at any point on the inner surface, Δβ is the slope of the tangent line at any point on the exit surface, θ ₁ is collected at the primary optical component and is incident on the cover part When the incident angle θ of the light is defined as an angle forming an imaginary reference axis parallel to the optical axis of the secondary optical component, the incident angle at which the directly incident light is incident on the cover portion, n: the secondary optical component Refractive index of the material) The method of claim 6, The inner side surface is formed in the form of an inclined surface having a constant slope Δα at an arbitrary point on the inner side surface, and the exit surface is an inclined surface having a constant slope Δβ at an arbitrary point on the exit surface. Secondary optical component for a light collecting solar cell module, characterized in that consisting of. The method of claim 1, The secondary optical component of claim 2, wherein the secondary optical component is one-body molded from a transparent material. A frame; A carrier having a solar cell; A primary optical element provided above the frame to primaryly collect incident light; And An upper portion of the carrier to seal the carrier, and secondarily collect light collected by the primary optical component into the solar cell, and light collected by the primary optical component to be incident on the carrier. Condensing solar cell module comprising; secondary optical component to prevent. The method of claim 9, The secondary optical component, A cover part covering and sealing the carrier; A secondary lens unit extending downward from the center of the cover part to focus the light incident on the primary optical component and to focus the light incident on the center of the cover part to the solar cell by internal reflection; And And an inner side surface reflecting or totally reflecting light that is directly incident to the carrier to prevent the light that is collected by the primary optical component from entering the cover part and not incident to the secondary lens part. Condensing solar cell module, characterized in that. The method of claim 10, Condensing solar cell module characterized in that it further comprises an emission surface for emitting the light reflected or totally reflected from the inner side to the outside of the cover portion. The method of claim 9, The frame consists of a side plate and a bottom plate, The condensing solar cell module, A carrier frame provided on an upper portion of the lower plate and provided with a plurality of carriers at a predetermined interval thereon; A wire connecting the carrier; And And a wire cover provided on the lower plate to cover the wires and coupled to the lower plate while fixing the carrier frame. The method of claim 12, The secondary optical component is provided with a flange extending outwardly at an outermost portion, The wire cover is a light collecting solar cell module, characterized in that provided with a third leg portion for pressing the flange of the secondary optical component when coupled to the lower plate. The method of claim 12, One side of the secondary optical component is a light collecting solar cell module, characterized in that the passage portion through which the wire passes. The method of claim 10, And wherein the directly incident light is off-axis light from the primary optical component. The method of claim 9, And the secondary optical component is one-body molded from a transparent material.

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