JP2023084764A - Concentrator photovoltaic power generation module, concentrator photovoltaic power generation device, and farming system - Google Patents

Abstract

To provide a concentrator photovoltaic power generation module which has lighting property to a module lower side.SOLUTION: A concentrator photovoltaic power generation module includes: a body which has a bottom plate provided with a through hole; a light receiving section which includes a plurality of power generation elements and is provided on the bottom plate in a state of avoiding the through hole; a concentrator section which includes a plurality of lens elements for focusing direct sunlight to each of a plurality of power generation elements and is provided in an upper section of the body; a shielding section which is provided between the concentrator section and the light receiving section and has a shielding region and a passing region; and a sealing section which seals the body by covering the bottom plate from a lower side. The shielding region shields light focused to a position deviated from the power generation elements by the lens elements of the direct sunlight. The passing region passes light focused to the power generation elements by the lens elements of the direct sunlight and scattered light made incident to the lens elements from an angle different from the direct sunlight. The sealing section transmits the scattered light passing through the passing region and the through hole.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present disclosure relates to a concentrating photovoltaic module, a concentrating photovoltaic power generation device, and a farming system.

Conventionally, a concentrator photovoltaic module that collects sunlight while tracking the sun and converts it into electric power is known. In a concentrator photovoltaic power generation module, a shielding plate is used to block light converged at a position away from the power generation element in order to suppress damage when tracking deviation occurs.

For example, Patent Literature 1 discloses a light shielding plate that covers a mounting board on which solar cell elements are mounted and shields sunlight from irradiating areas other than light receiving areas of the solar cell elements. Further, Japanese Patent Laid-Open No. 2002-200000 discloses a shielding plate that is fixed while being mounted on a lens supporting portion that supports a secondary lens.

In addition, for a photovoltaic power generation device that is not a concentrating type, a see-through type solar cell module that transmits sunlight to the rear of the device while generating power has been proposed. For example, in Patent Document 3, a transparent front electrode layer, a photoelectric conversion unit, and a back electrode layer are formed on a glass substrate, and a see-through structure is formed by forming a light transmission window between adjacent photoelectric conversion units. Techniques are disclosed.

Japanese Patent Application Laid-Open No. 2006-344698 JP 2017-034116 A JP-A-2002-299663

In the case of a concentrator photovoltaic module, a shielding plate as shown in Patent Documents 1 and 2 has been provided in order to suppress damage to the module. For this reason, a concentrator photovoltaic module that has both a shielding plate and a see-through structure has not been proposed in the past. was occurring.

In view of such a problem, an object of the present disclosure is to provide a concentrating photovoltaic power generation module, a concentrating photovoltaic power generation device, and a farming system that are capable of admitting light to the lower side of the module.

A concentrator photovoltaic module of the present disclosure includes a housing having a bottom plate provided with a through hole, and a plurality of power generation elements, and a light receiving unit provided on the bottom plate while avoiding the through hole. and a plurality of lens elements for respectively converging direct sunlight onto the plurality of power generation elements, a light collecting portion provided on an upper portion of the housing, and a light collecting portion provided between the light receiving portion and the light receiving portion , a shielding part having a shielding area and a passing area, and a sealing part that seals the housing by covering the bottom plate from below, wherein the shielding area is blocked by the lens element from the direct sunlight blocking light focused to a position away from the power generating element, the passing area being the light of the direct sunlight focused on the power generating element by the lens element and the lens element from an angle different from the direct sunlight; and the scattered light incident on the sealing portion is a concentrator photovoltaic module that transmits the scattered light that has passed through the passing region and the through hole.

According to the present disclosure, it is possible to provide a concentrating photovoltaic module, a concentrating photovoltaic power generation device, and a farming system that are capable of admitting light downward from the module.

FIG. 1 is a perspective view showing a concentrator photovoltaic power generation device according to an embodiment. FIG. 2 is a perspective view showing a state in the middle of assembling the concentrator photovoltaic power generation device according to the embodiment. FIG. 3 is a perspective view showing a concentrator photovoltaic module according to an embodiment. FIG. 4 is a cross-sectional view showing a concentrator photovoltaic module according to an embodiment. 5 is a cross-sectional view of the bottom plate viewed from arrow V in FIG. 4. FIG. FIG. 6 is an enlarged view showing the light receiving portion of FIG. 4 and its surroundings. 7 is a cross-sectional view of the shield viewed from arrow VII in FIG. 4. FIG. FIG. 8 is a schematic diagram showing a farming system according to the embodiment. FIG. 9 is a cross-sectional view showing a concentrator photovoltaic module according to a modification. 10 is a cross-sectional view of the shielding portion viewed from the arrow X in FIG. 9. FIG. FIG. 11 is a cross-sectional view showing a shielding portion according to a modification. FIG. 12 is a cross-sectional view showing a shielding portion according to a modification. FIG. 13 is a bottom view showing a bottom plate according to a modification.

[Description of Embodiments of the Present Disclosure]
Embodiments of the present disclosure include at least the following as gists thereof.

(1) A concentrator photovoltaic module of the present disclosure includes a housing having a bottom plate provided with a through hole, and a plurality of power generation elements, which are provided on the bottom plate while avoiding the through hole. a light receiving portion provided in an upper portion of the housing, the light collecting portion including a plurality of lens elements for focusing the direct sunlight on the plurality of power generation elements, respectively, and between the light collecting portion and the light receiving portion provided in the light focused by the lens element to a position away from the power generation element is blocked, and the passing area is a portion of the direct sunlight that is focused on the power generation element by the lens element and from an angle different from the direct sunlight; and scattered light incident on the lens element, and the sealing portion transmits the scattered light that has passed through the passing region and the through hole.

According to the concentrator photovoltaic module of the present disclosure, while direct sunlight is used for power generation, scattered light is transmitted below the concentrator photovoltaic module through the passage area, the through hole, and the sealing plate. can be reached. In addition, when tracking deviation occurs, it is possible to suppress damage to the concentrator photovoltaic module by shielding the direct sunlight with the shielding region. As a result, it is possible to realize a concentrating photovoltaic power generation module having a downward lighting property while coping with the tracking deviation. In addition, since the sealing portion can suppress the intrusion of foreign matter into the housing through the through-hole, the power generation efficiency of the concentrator photovoltaic power generation module is reduced due to the foreign matter while ensuring the lighting performance. can be suppressed.

(2) A gap may be formed between the sealing portion and the bottom plate. The bottom plate may dissipate heat during power generation. By forming a gap between the sealing portion and the bottom plate, it is possible to suppress damage to the sealing portion due to heat of the bottom plate.

(3) The gap may be twice or more the thickness of the bottom plate. By configuring in this way, damage to the sealing portion can be suppressed more reliably.

(4) The bottom plate may be made of metal, and the portion of the sealing portion that transmits the scattered light may be made of resin. If the bottom plate is made of metal, the heat during power generation can be more efficiently released from the bottom plate through thermal conduction. In addition, when the sealing portion contains resin, it is possible to reduce the weight of the sealing portion compared to the case where the sealing portion is made of glass. The risk of heat damage to the seal increases. Even in such a case, damage to the sealing portion can be suppressed by forming a gap between the sealing portion and the bottom plate.

(5) The shielding area may include a shielding plate that shields sunlight, and the passing area may include an opening formed in the shielding plate.

(6) The shielding area may include a plurality of shielding plates, and the passing area includes a first area that allows the light focused on the power generation element to pass through, a second area that allows the scattered light to pass through, and , the first region may be the opening, and the second region may be a gap between the plurality of shielding plates.

For example, when the second region is formed as an opening of the shielding plate, increasing the area of the second region may weaken the strength of the shielding plate. On the other hand, if the shielding portion is composed of a plurality of shielding plates and the second region is formed as a gap between the plurality of shielding plates, the influence on the strength of the shielding plates is reduced and the area of the second region can be increased. becomes possible. Therefore, more scattered light can be made to reach the lower side of the concentrator photovoltaic power generation module, and the downward lighting performance can be further enhanced.

(7) The light-receiving section has a secondary lens that further converges the light converged by the lens element onto the power generation element, and a lens support section that supports the secondary lens above the power generation element. The shielding plate may be provided on the lens supporting portion, and the secondary lens may be provided in the opening.

Since the shielding plate is supported by the lens supporting portion, it is less likely to bend than when it is supported only by the housing, for example, and the strength of the shielding plate can be further weakened. Therefore, the area of the second region can be increased, and the downward lighting can be further enhanced.

(8) A signboard portion may be provided on the lower surface of the bottom plate and visible through the sealing portion. In the case of a conventional concentrator photovoltaic module, the lower surface of the bottom plate is a shadow, so even if the signboard portion is provided on such a lower surface, it is not visually recognized well by the user. On the other hand, the bottom plate of the housing is provided with a plurality of through-holes for passing scattered light, and a sealing portion for sealing the housing. A part of the scattered light that reaches the sealing portion through the through-hole is reflected at the sealing portion to illuminate the bottom surface of the bottom plate. Therefore, since the lower surface looks brighter than the conventional concentrator photovoltaic module, the signboard section provided on the lower surface can be better visually recognized by the user.

(9) The sealing section may include a diffusion section that diffuses the scattered light. By configuring in this way, the in-plane uniformity of the brightness of the scattered light can be improved, so that the lower side of the concentrator photovoltaic module can be uniformly illuminated.

(10) The sealing portion may include a color filter portion that absorbs light of a predetermined wavelength among the scattered light. By configuring in this way, it is possible to illuminate the lower side of the concentrator photovoltaic module while removing light in a predetermined range of wavelengths.

(11) A concentrator photovoltaic power generation device of the present disclosure includes an array configured by assembling a plurality of the concentrator photovoltaic modules according to any one of (1) to (10) above. type solar power generation system.

(12) The farming system of the present disclosure includes the concentrator photovoltaic power generation device of (11) installed in the farmland, and the concentrator photovoltaic device receives the direct sunlight from the shielding area or the light receiving area. The farm management system is such that the scattered light that is blocked by a portion and passes through the passage region and the through hole and through the sealing portion is supplied to the farmland.

Some of the crops planted in farmland are vulnerable to direct sunlight and suffer leaf scorch or the like when exposed to direct sunlight for a long period of time. In a farming system, the concentrator photovoltaic device blocks direct sunlight and selectively lets scattered light through, so the farmland is illuminated with relatively mild light. As a result, it is possible to suppress leaf scorch and the like of crops, and to grow crops more efficiently. Furthermore, since the blocked direct sunlight is used for power generation in the concentrator photovoltaic power generation device, sunlight can be used more efficiently.

[Details of the embodiment of the present disclosure]
Hereinafter, details of embodiments of the present disclosure will be described with reference to the drawings.

<<Configuration of Concentrator Photovoltaic Power Generation Device>>
1 and 2 are perspective views of one example of a concentrating photovoltaic power generation device viewed from the light receiving surface side. FIG. 1 shows the concentrator photovoltaic power generation device 100 in a completed state, and FIG. 2 shows the concentrator photovoltaic power generation device 100 in a state during assembly. In FIG. 2, the right half shows a state in which the framework of the tracking mount 25 is visible, and the left half shows a state in which the concentrator photovoltaic module (hereinafter simply referred to as "module") M1 is attached. When actually attaching the module M1 to the tracking mount 25, the mounting is performed with the tracking mount 25 lying on the ground.

In FIG. 1 , a concentrator photovoltaic power generation device 100 includes an array 1 and a support mechanism 2 . Array 1 is also referred to as a "concentrator photovoltaic panel". The array 1 forms a planar light receiving surface as a whole, which is continuous on the upper side and divided into right and left sides on the lower side. The array 1 is constructed by aligning the modules M1 on the rear tracking mount 25 (FIG. 2). In the example of FIG. 1, the array 1 is an assembly of a total of 200 modules M1, consisting of (96 (=12×8)×2) constituting the left and right wings and 8 modules M1 in the central crossing portion. It is configured.

A support mechanism 2 supports the array 1 . The support mechanism 2 includes a column 21 , a base 22 , a drive section 23 , a horizontal shaft 24 ( FIG. 2 ) that serves as a drive shaft, and a tracking mount 25 . The strut 21 is a vertically extending member. A lower end of the support 21 is fixed to the base 22 . The driving portion 23 is provided at the upper end of the support 21 .

In FIG. 1, the foundation 22 is firmly buried in the ground so that only the top surface can be seen. With the foundation 22 buried in the ground, the struts 21 are vertical and the horizontal axis 24 (FIG. 2) is horizontal. The drive unit 23 can rotate the horizontal shaft 24 in two directions, ie, an azimuth angle (an angle about the column 21 as a central axis) and an elevation angle (an angle about the horizontal axis 24 as the central axis). In FIG. 2, a reinforcing member 25a is attached to the horizontal shaft 24 to reinforce the tracking mount 25. As shown in FIG. A plurality of horizontal rails 25b are attached to the reinforcing member 25a. The module M1 is attached so as to fit into the rail 25b. If the horizontal axis 24 rotates in an azimuth or elevation direction, the array 1 will also rotate in that direction.

The vertical orientation of the array 1 as in FIG. 1 is normally before dawn and sunset. During the daytime, the array 1 performs the sun tracking operation by operating the drive unit 23 so that the light receiving surface of the array 1 always faces the sun.

《Configuration of concentrator photovoltaic module》
FIG. 3 is a perspective view showing the configuration of the module M1 according to the embodiment, disassembled as appropriate.
FIG. 4 is a cross-sectional view showing a simplified module M1 according to the embodiment.

The module M<b>1 includes a housing 11 , a condensing section 12 , a light receiving section 13 , a shielding section 14 and a sealing section 15 . In the following description, the side of the light receiving section 13 on which the light collecting section 12 is positioned is referred to as the upper side, and the side of the housing 11 on which the bottom plate 111 described later is positioned is referred to as the lower side. The vertical direction of the module M1 does not necessarily coincide with the vertical direction (for example, the direction in which the column 21 extends), and the vertical direction changes from moment to moment with respect to the vertical direction due to the tracking operation of the drive unit 23 .

In FIG. 3, a portion of the shielding portion 14 is omitted in order to show the state of the light receiving portion 13 and a bottom plate 111 which will be described later. Each part shown in FIGS. 3 and 4 is drawn in an appropriately enlarged manner for the sake of explanation of the structure, and the figures are not necessarily proportional to the actual dimensions (the same applies to the drawings after FIG. 5). FIG. 4 shows the state in which the light receiving surface of the array 1 faces the sun.

As shown in FIG. 4, sunlight reaching the module M1 includes direct sunlight L1 and scattered light L2. The direct sunlight L1 is light that directly reaches the module M1 without being scattered, absorbed, or reflected by foreign substances (for example, dust, clouds, etc.) in the sunlight. The scattered light L2 is light that reaches the module M1 after being scattered by foreign matter in the air. In a state in which the light receiving surface of the array 1 faces the sun due to the tracking operation of the drive unit 23 (FIG. 1), the incident angle of the direct sunlight L1 with respect to the module M1 is 0 degrees. The direction in which the scattered light L2 travels is random, and the scattered light L2 enters the module M1 from various directions.

The module M1 utilizes the direct sunlight L1 for power generation and allows the scattered light L2 to pass downward, thereby ensuring daylighting. For this reason, the module M1 has a through hole 111a formed in the bottom plate 111 of the housing 11 and an opening 145 formed in the shielding portion 14 to allow the scattered light L2 to pass therethrough. The module M1 also includes a sealing portion 15 that covers the bottom plate 111 from below to seal the housing 11 in order to prevent foreign matter from entering the housing 11 through the through hole 111a formed in the bottom plate 111. Prepare. The configuration of the module M1 will be described in detail below.

The housing 11 is a flat-bottomed container and has a bottom plate 111 and a frame 112 . The bottom plate 111 is, for example, a rectangular flat plate made of metal. The metal forming the bottom plate 111 is, for example, aluminum or an aluminum alloy. The thickness of the bottom plate 111 is, for example, 0.5 mm or more and 1 mm or less. The surface of the bottom plate 111 that faces the light collector 12 side is the upper surface 11a, and the surface of the bottom plate 111 that faces the sealing portion 15 side is the lower surface 11b. A plurality of through holes 111 a are formed in the bottom plate 111 . The frame 112 is provided along the periphery of the top surface 11 a of the bottom plate 111 . The bottom plate 111 and the frame 112 may be separate bodies, or may be integrally formed.

The condensing unit 12 is provided on the upper side of the housing 11 . Specifically, the condensing part 12 is fixed to the frame 112 while riding on the upper end of the frame 112 . The condensing section 12 includes a plurality of lens elements 12a. For example, each area of a square (14×10 in this embodiment, but the number is just an example) indicated by broken lines in FIG. 3 is the lens element 12a. Note that the grid-like dotted lines are lines for the sake of convenience in expressing the regions, and actually there is no need for such partition lines to exist.

The lens element 12a is, for example, a Fresnel lens made of glass or transparent resin, and mainly transmits light with a wavelength of 300 nm to 2000 nm in sunlight. An optical axis Ax1 of the lens element 12a passes through a power generation element 32, which will be described later. The lens element 12a focuses the direct sunlight L1 incident along the optical axis Ax1 (that is, incident at an incident angle of 0 degrees) onto the power generating element 32. As shown in FIG.

5 is a cross-sectional view of the bottom plate 111 viewed from arrow V in FIG. The light receiving portion 13 is provided on the bottom plate 111 while avoiding the through hole 111a. The light receiving section 13 has a wiring 13a and a power generation section 13b.

The wiring 13a is formed on the bottom plate 111 as, for example, a flexible printed wiring board. As shown in FIG. 5, the wiring 13a is arranged in a zigzag manner, one on each of the right half and the left half of the bottom plate 111. As shown in FIG. A junction box B1 is provided at the end of the wiring 13a for connecting the wiring 13a and extracting electric power to the outside. The wiring 13a has a relatively wide portion and a relatively narrow portion. The power generation portion 13b is mounted on a wide portion of the wiring 13a.

FIG. 6 is an enlarged view showing the light receiving portion 13 of FIG. 4 and its surroundings. The power generation section 13 b includes a package 31 , a power generation element 32 , lead frames 33 and 34 , wires 35 , a support section 36 , a protective plate 37 , a secondary lens 38 and a sealing resin 39 .

The package 31 is, for example, a base made of resin formed on a wide portion of the wiring 13a. The package 31 holds the power generation element 32 and lead frames 33 and 34 . The power generation element 32 is an element (cell) that converts light energy into electromotive force, and includes a semiconductor having a PN junction. A bypass diode may be connected in parallel to the power generation element 32 . The lead frame 33 is an electrode electrically connected to the P side of the power generation element 32 . The lead frame 34 is an electrode that is electrically connected to the N side of the power generation element 32 via a metal (for example, gold) wire 35 . The output of the power generation element 32 is led out to the wiring 13a via the lead frames 33, 34. As shown in FIG.

The support portion 36 is a resin cylinder formed on the package 31 . The support portion 36 supports the protection plate 37 . The protection plate 37 is, for example, a metal washer. An opening 37 a is formed in the center of the protective plate 37 .

The secondary lens 38 is a lens that further converges the light converged by the lens element 12a onto the power generation element 32, and is, for example, a ball lens. A secondary lens 38 is provided in the opening 37a. More specifically, the secondary lens 38 is supported by the inner peripheral end 37b of the protection plate 37 forming the opening 37a in a state where a gap is formed between the secondary lens 38 and the power generation element 32 in the direction of the optical axis Ax1. there is The sealing resin 39 is a light-transmitting silicone resin, is provided inside the support portion 36 and the protective plate 37 , and fills the space formed between the power generation element 32 and the secondary lens 38 .

FIG. 7 is a cross-sectional view of the shielding portion 14 viewed from arrow VII in FIG. As shown in FIGS. 3 and 4 , the shielding portion 14 is provided between the light collecting portion 12 and the light receiving portion 13 . The shielding portion 14 is a member for suppressing damage to the light receiving portion 13 and the like when the tracking deviation occurs in the array 1 . The shielding portion 14 has a shielding area 141 and a passing area 142 .

When the array 1 is normally tracking the sun, the direct sunlight L1 is focused onto the power generating element 32 by the lens element 12a. On the other hand, for example, if the tracking of the array 1 deviates (that is, if the array 1 does not face the sun), the direct sunlight L1 may be focused by the lens element 12a to a position away from the power generating element 32. . The direct sunlight L1 converging at a position away from the power generation element 32 may burn the light receiving section 13 (for example, the wiring 13a). Therefore, the shielding region 141 shields the light of the direct sunlight L1 that is converged by the lens element 12a to a position away from the power generating element 32. As shown in FIG.

The shielding area 141 is composed of, for example, one shielding plate 143 . The shielding area 141 may be an area in which a plurality of shielding plates are combined in the horizontal direction. The shielding plate 143 is a flat plate made of metal (eg, aluminum or aluminum alloy) and shields sunlight. The shielding plate 143 shields, for example, 80% or more of the total energy contained in light with a wavelength of 400 nm to 2000 nm.

Passing area 142 includes first area 144 and second area 145 . The first region 144 and the second region 145 are openings formed in the shielding plate 143 respectively. Therefore, the first region 144 and the second region 145 are also appropriately referred to as "opening 144" and "opening 145". The first region 144 allows passage of the light of the direct sunlight L1 that is focused on the power generation element 32 by the lens element 12a. The light that has passed through the first region 144 is further focused by the secondary lens 38 and enters the power generation element 32 to be used for power generation.

That is, when the array 1 faces the sun, the direct sunlight L1 reaches the light receiving section 13 through the first region 144 after being focused by the lens element 12a. On the other hand, when the array 1 does not face the sun, the direct sunlight L1 is blocked by the shielding area 141 after being focused by the lens element 12a, and thus does not reach the light receiving section 13.

The second region 145 passes scattered light L2 incident on the lens element 12a from angles different from the direct sunlight L1. As shown in FIGS. 4, 5 and 7, the second region 145 is formed at a position overlapping the through hole 111a of the bottom plate 111 in the vertical direction. Therefore, the scattered light L2 that has passed through the second region 145 also passes through the through hole 111a.

The positional relationship among the shielding area 141, the first area 144, and the second area 145 will be described with reference to FIG. In FIG. 6, the areas on the shielding portion 14 are divided into areas R1, R2, and R3 for each position where the direct sunlight L1, L1a, and L1b are converged by the lens element 12a.

The region R1 is a region where the converging position P1 of the direct sunlight L1 passing through the region R1 is on the power generation element 32 . In FIG. 6, the incident angle of the direct sunlight L1 passing through the region R1 is 0 degrees or more and less than the first angle θ1. The first angle θ1 is, for example, an angle greater than 0 degrees and 5 degrees or less, specifically 2 degrees. That is, the direct sunlight L1 passing through the region R1 enters substantially along the optical axis Ax1. The above incident angle is an example, and the incident angle of the direct sunlight L1 passing through the region R1 changes according to the area of the power generation element 32, for example. The region R1 is a circular region positioned within a predetermined radius around the optical axis Ax1 of the lens element 12a. A first region 144 (opening 144) is formed in the region R1.

The region R2 is a region where the convergence position P2 of the direct sunlight L1a passing through the region R2 is a position outside the power generating element 32 in the light receiving section 13. As shown in FIG. The incident angle of the direct sunlight L1a passing through the region R2 is greater than or equal to the first angle θ1 and less than or equal to the second angle θ2. The second angle θ2 is greater than the first angle θ1 and 15 degrees or less, specifically 10 degrees. That is, the direct sunlight L1a passing through the region R2 is incident from a direction somewhat different from the optical axis Ax1. The above incident angle is an example, and the incident angle of the direct sunlight L1a passing through the region R2 changes according to the area of the light receiving section 13, for example.

The convergence position P2 is, for example, on the wiring 13a. If the direct sunlight L1a converges on the convergence position P2, there is a high possibility that the light receiving section 13 will be damaged (for example, burnt out). Therefore, in order to suppress damage to the light receiving section 13, a shielding area 141 (shielding plate 143) is formed in the area R2 to shield the direct sunlight L1a passing through the area R2. The region R2 is a doughnut-shaped region having a predetermined width outside the region R1.

The area R3 is an area where the convergence position P3 of the direct sunlight L1b passing through the area R3 is outside the light-receiving unit 13, or the direct sunlight L1b travels away from the optical axis Ax1 by a relatively large amount, so that the direct sunlight L1b is originally the lens element 12a. is the area that is not focused by The incident angle of the direct sunlight L1b passing through the region R3 is greater than the second angle θ2. The focus position P3 is on the bottom plate 111 or within a through hole 111a formed in the bottom plate 111, for example. Even if the direct sunlight L1b converges on the convergence position P3, the possibility of damaging the light receiving section 13 is low. For this reason, in order to ensure the daylighting of the module M1, a second region 145 (opening 145) is formed in the region R3 to allow the scattered light L2 passing through the region R3 to pass therethrough. Region R3 is a region located outside region R2.

That is, the regions of the shielding portion 14 are arranged in order of the first region 144, the shielding region 141, and the second region 145 from the inside centering on the optical axis Ax1 with respect to one lens element 12a.

In the example of FIG. 6, a shielding region 141 is formed in a region (transition region) adjacent to the region R2 in the region R3. When the direct sunlight L1b passes through the transition region, the convergence position P3 of the direct sunlight L1b is outside the light receiving section 13, but the convergence position P3 is near the light receiving section 13, so the convergence position P3 (for example, the bottom plate 111) The light-receiving unit 13 may be damaged due to heat conduction from the outside. Therefore, in order to more reliably suppress damage to the light receiving section 13, a shielding region 141 may be formed as a margin in a region adjacent to the region R2 in the region R3. In this case, the second region 145 is formed outside the region where the shielding region 141 is formed in the region R3.

Please refer to FIG. The sealing portion 15 is a member that seals the housing 11 by covering the bottom plate 111 from below. The sealing portion 15 can prevent foreign matter (for example, dust, sand, etc.) from entering the housing 11 through the through hole 111a. can be suppressed.

The sealing portion 15 has a sealing plate 15a and a support portion 15b. The sealing plate 15a is a plate-like member positioned parallel to the bottom plate 111 with a predetermined gap S1 interposed therebetween. The sealing plate 15a is made of resin and mainly transmits light having a wavelength of 300 nm to 2000 nm. The sealing plate 15a more specifically contains acrylic, polycarbonate, polystyrene, polyethylene terephthalate, or AS resin. The sealing plate 15a transmits the scattered light L2 that has passed through the passage area 142 and the through hole 111a.

The support portion 15b is a member that supports the sealing plate 15a on the lower side of the bottom plate 111 . The support portion 15b is provided on the periphery of the bottom surface 11b of the bottom plate 111 . In the example of FIG. 4, the support portion 15b is formed integrally with the sealing plate 15a from the same material as the sealing plate 15a. The supporting portion 15b may be formed separately from the sealing plate 15a using a material (for example, metal) different from that of the sealing plate 15a.

A gap S1 between the bottom plate 111 and the sealing plate 15a is, for example, twice the thickness of the bottom plate 111 or more. For example, when the thickness of the bottom plate 111 is 0.5 mm, the gap S1 (the distance between the bottom plate 111 and the sealing plate 15a) is 1 mm or more, more preferably 3 mm or more, for example 5 mm.

The bottom plate 111 is made of metal, and the heat of the power generating section 13b heated by the direct sunlight L1 or the like during power generation can be efficiently released from the bottom plate 111 by thermal conduction. Since the sealing plate 15a is made of resin, it is possible to reduce the weight of the sealing plate 15a compared to the case where glass is used for the sealing plate 15a. Increased risk of injury. Since the sealing plate 15a is provided with a gap S1 from the bottom plate 111 that dissipates heat during power generation, damage to the sealing plate 15a due to the heat of the bottom plate 111 can be suppressed.

In addition, since the focal length F1 of the lens element 12a is designed to be approximately the distance from the lens element 12a to the power generation element 32, the position most heated by the direct sunlight L1 is near the power generation element 32. The sealing plate 15a is provided at a position separated from the lens element 12a by a distance D1 which is further than the focal length F1. The distance D1 is the distance from the power generation element 32 by the package 31, the wiring 13a, the bottom plate 111, and the gap S1. The distance D1 is, for example, 5% or more of the focal length F1, and when the focal length F1 is 40 mm, the distance D1 is set to 2 mm or more. Thus, since the sealing plate 15a is provided at a position sufficiently distant from the focal length F1, even if the focal point of the lens element 12a is heated by the direct sunlight L1, thermal damage to the sealing plate 15a is suppressed. be able to.

According to the module M1 described above, the direct sunlight L1 incident on the lens element 12a along the optical axis Ax1 is used for power generation, and the scattered light L2 incident on the lens element 12a from an angle different from that of the direct sunlight L1 is opened. 145, the through hole 111a and the sealing plate 15a to reach the lower side of the module M1. In addition, when tracking deviation occurs, by shielding the direct sunlight L1 with the shielding area 141, damage to the module M1 can be suppressed. As a result, it is possible to realize the module M1 having a downward lighting property while coping with the tracking deviation. In addition, since the sealing portion 15 can prevent foreign matter from entering the housing 11 through the through hole 111a, it is possible to prevent a decrease in power generation efficiency of the module M1 caused by the foreign matter while ensuring the lighting performance. can be suppressed.

《Example of application of concentrator photovoltaic power generation device》
The array 1 constructed by gathering a plurality of such modules M1 shields the direct sunlight L1 and allows the scattered light L2 to pass downward, so that the underside of the array 1 is illuminated with relatively mild light. Therefore, the array 1 can be applied to, for example, a farming system.

FIG. 8 is a schematic diagram showing a farming system FS1 according to the embodiment. The farming system FS1 includes a concentrating photovoltaic power generation device 100 installed on a farmland FM1. FIG. 8 representatively shows one module M1 of the concentrator photovoltaic power generation device 100 . In the concentrator photovoltaic power generation device 100, the direct sunlight L1 is blocked by the shielding region 141 or the light receiving section 13, passes through the passage region 142 (specifically, the second region 145) and the through hole 111a, and passes through the sealing section 15. The transmitted scattered light L2 is supplied to the farmland FM1.

Among the crops planted in the farmland FM1, there are crops that are vulnerable to the direct sunlight L1 and suffer leaf scorch or the like when exposed to the direct sunlight L1 for a long period of time. In the farming system FS1, the concentrator photovoltaic power generation device 100 blocks the direct sunlight L1 and selectively passes the scattered light L2. illuminated. As a result, it is possible to suppress leaf scorch and the like of crops, and to grow crops more efficiently. Furthermore, since the blocked direct sunlight L1 is used for power generation in the concentrator photovoltaic power generation device 100, sunlight can be used more efficiently.

<<Modification>>
Although the embodiments of the present disclosure have been described above, the present disclosure can be modified in various ways other than the above-described modes. Modifications of the embodiments of the present disclosure will be described below. In the modifications below, the same reference numerals are given to the same configurations as in the embodiment, and the description thereof is omitted.

<<First Modification of Shielding Unit>>
FIG. 9 is a cross-sectional view showing a concentrator photovoltaic module M1a (hereinafter simply referred to as "module M1a") according to a modification. The module M1a is different from the module M1 of the embodiment in that a shielding portion 14a is provided instead of the shielding portion 14, and other points are common. Note that the module M1a may include both the shielding portion 14 and the shielding portion 14a.

The shielding portion 14a is provided in the power generation portion 13c of the module M1a. The power generation section 13c is a modification of the power generation section 13b, and is mainly different from the power generation section 13b in that it includes a shielding plate 370 instead of the protection plate 37. As shown in FIG. The shielding portion 14 a is configured by a plurality of shielding plates 370 . The support portion 36 of the power generation portion 13c supports the secondary lens 38 on the power generation element 32, and is hereinafter also referred to as the "lens support portion 36". A shielding plate 370 is provided on the lens support portion 36 .

The shield plate 370 is, for example, a washer made of metal. An opening 370 a is formed in the center of the shielding plate 370 . The secondary lens 38 is provided in the opening 370 a with the upper part of the secondary lens 38 protruding above the shielding plate 370 . That is, the shielding plate 370 is a type of shielding plate that is fitted into the secondary lens 38 . The width (diameter) of the shielding plate 370 is larger than the width of the wiring 13a in the widthwise direction, and the edge 370b of the shielding plate 370 is located outside the end in the widthwise direction of the wiring 13a centering on the optical axis Ax1. ing.

FIG. 10 is a cross-sectional view of the shielding portion 14a viewed from the arrow X in FIG. The shielding portion 14a has a shielding area and a passing area. The shielding area of the shielding portion 14 a includes a plurality of shielding plates 370 . That is, the plurality of shielding plates 370 function as shielding regions of the shielding portion 14a. The passage area of the shielding portion 14a includes an opening 370a (first area) for passing the light focused on the power generation element 32 among the direct sunlight L1, and a gap 370c (second area) for passing the scattered light L2. A gap 370 c is a gap between the plurality of shielding plates 370 .

According to the module M1a described above, the direct sunlight L1 incident on the lens element 12a along the optical axis Ax1 is used for power generation, while the scattered light L2 incident on the lens element 12a from an angle different from that of the direct sunlight L1 is received by the gap. 370c, the through hole 111a, and the sealing plate 15a to reach the lower side of the module M1a. Thereby, it is possible to realize the module M1a having a downward lighting property.

In the above embodiment, since the second region 145 is formed as an opening of the shielding plate 143, increasing the area of the second region 145 may weaken the strength of the shielding plate 143. FIG. On the other hand, in this modification, the shielding portion 14a is configured by a plurality of washer-like shielding plates 370, and the second region is the gap 370c between the plurality of shielding plates 370. Therefore, even if the gap 370c is widened, the shielding plates 370 has little effect on the strength of As a result, it is possible to make the area of the second region wider, so that more scattered light L2 can reach the lower side of the module M1a, and it is possible to further improve the downward lighting performance. .

<<Second Modification of Shielding Unit>>
FIG. 11 is a cross-sectional view showing a shielding portion 14b according to a modification. The shielding portion 14b includes a plurality of shielding plates 371 of a type that fits into the secondary lens 38, similar to the shielding portion 14a shown in FIGS. 9 and 10, one shielding plate 370 corresponds to one secondary lens 38 on a one-to-one basis, and one shielding plate 370 is formed with one opening 370a. On the other hand, one shielding plate 371 corresponds to a plurality of (seven in the example of FIG. 11) secondary lenses 38 on a one-to-many basis, and one shielding plate 371 has a plurality of (see FIG. 11) openings 371a are formed.

The shielding portion 14b has a shielding area and a passing area. The shielding area of the shielding portion 14 b includes a plurality of shielding plates 371 . That is, the plurality of shielding plates 371 function as shielding regions of the shielding portion 14b. The passage area of the shielding portion 14b includes an opening 371a (first area) that allows passage of light focused on the power generation element 32 among the direct sunlight L1, and a gap 371c (second area) that allows passage of the scattered light L2. A gap 370 c is a gap between the plurality of shielding plates 371 .

When manufacturing the shielding portion 14a (FIG. 10), it is necessary to attach the shielding plate 370 to the secondary lens 38 individually, and the number of manufacturing steps corresponding to the number of the shielding plates 370 is required. According to the shielding portion 14b, since one shielding plate 371 can be collectively attached to the plurality of secondary lenses 38, manufacturing man-hours can be reduced as compared with the shielding portion 14a. Further, in the shielding portion 14b, the second region is the gap 371c between the plurality of shielding plates 371, so that the area of the second region can be made larger than that of the shielding portion 14. FIG. For this reason, according to the shielding part 14b, it is possible to reduce the manufacturing cost and further improve the downward lighting property.

<<Third Modification of Shielding Unit>>
FIG. 12 is a cross-sectional view showing a shielding portion 14c according to a modification. The shielding portion 14c includes a plurality of shielding plates 372 of the type that fit over the secondary lens 38, similar to the shielding portion 14a shown in FIGS. The shielding plate 372 has a structure in which a plurality of shielding plates 371 shown in FIG. 11 are connected to each other in a grid pattern to form a single shielding plate. The shielding plate 372 is formed with a plurality of openings 372a into which the plurality of secondary lenses 38 are respectively inserted, and a plurality of openings 372c for passing the scattered light L2.

The shielding portion 14c has a shielding area and a passing area. A shielding area of the shielding portion 14 c is configured by one shielding plate 372 . The passage area of the shielding portion 14c includes an opening 372a (first area) that allows passage of light focused on the power generation element 32 among the direct sunlight L1, and an opening 372c (second area) that allows passage of the scattered light L2.

According to the shielding part 14c, since one shielding plate 372 can be attached to all the secondary lenses 38 collectively, the number of manufacturing steps can be reduced compared to the shielding part 14a and the shielding part 14b. Further, since the shielding plate 372 is supported by the plurality of lens supporting portions 36, it is less likely to bend than the shielding plate 143 of the embodiment supported only by the frame 112, and the strength of the shielding plate 372 can be further weakened. is possible. Therefore, the area of the opening 372c (second region) can be made wider than that of the shielding plate 143 . For this reason, according to the shielding part 14b, it is possible to reduce the manufacturing cost and further improve the downward lighting property.

<<Modified example of bottom plate>>
FIG. 13 is a bottom view showing the lower surface 11b of the bottom plate 111 according to the modification. In FIG. 13, the sealing portion 15 is omitted. The module M1 may further comprise a signboard part SN1. The signboard portion SN1 is, for example, a colored layer provided on the lower surface 11b of the bottom plate 111, and is a region visible to the user through the sealing portion 15. As shown in FIG.

Information such as an advertisement, for example, is described on the signboard portion SN1. As shown in FIG. 13, the signboard portion SN1 is divided into the respective bottom plates 111 so that a plurality of bottom plates 111 are combined to form one advertisement (for example, the array 1 as a whole). Note that the signboard portion SN1 may be written as one piece of information on one bottom plate 111 . Since the housing 11 included in the array 1 moves while tracking the sun, by providing the signboard portion SN1 on the lower surface 11b of the bottom plate 111, the signboard portion SN1 can be seen in various directions.

In addition, in the case of the conventional concentrator photovoltaic module, the lower surface of the bottom plate is a shadow, so even if the signboard portion is provided on such a lower surface, it is not visually recognized well by the user. On the other hand, a bottom plate 111 of the array 1 is formed with a plurality of through holes 111a for passing the scattered light L2, and a sealing portion 15 for sealing the housing 11 is provided. A part of the scattered light L2 that reaches the sealing portion 15 through the through hole 111a is reflected by the sealing portion 15 to illuminate the lower surface 11b. Therefore, since the lower surface 11b looks brighter than the conventional concentrating photovoltaic module, the signboard part SN1 provided on the lower surface 11b can be visually recognized better by the user.

<<First Modification of Sealing Part>>
The sealing portion 15 may include a diffusion portion that diffuses the scattered light L2. For example, part or the whole of the sealing plate 15a shown in FIG. 4 may be the diffusion section. The diffusing part may be, for example, a diffusing plate (diffuser) in which a diffusing agent (for example, microparticles) for diffusing light is dispersed. Since the sealing portion 15 includes the diffusing portion, the in-plane uniformity of the brightness of the scattered light L2 can be improved, so that the lower side of the module M1 can be uniformly illuminated. For example, when the concentrating solar power generation device 100 is applied to the farming system FS1, the farmland FM1 can be uniformly illuminated with the scattered light L2, so that crops can be grown uniformly.

<<Second Modification of Sealing Part>>
The sealing portion 15 may include a color filter portion that absorbs light of a predetermined wavelength out of the scattered light L2. For example, part or the whole of the sealing plate 15a shown in FIG. 4 may be the color filter section. The color filter part absorbs 50% or more of light in a predetermined range of wavelengths (for example, ultraviolet light: 300 nm to 400 nm) among wavelengths from 300 nm to 2000 nm, and transmits 50% or more of light with other wavelengths. .

By including the color filter portion in the sealing portion 15, it is possible to illuminate the lower side of the module M1 while removing the light in the predetermined range from the scattered light L2. For example, when the concentrator photovoltaic power generation device 100 is applied to the farming system FS1 and the color filter part absorbs ultraviolet light, the farmland FM1 can be illuminated with the scattered light L2 from which the ultraviolet light has been removed. Adverse effects on crops can be suppressed. Moreover, it is possible to suppress sunburn of the user working in the farmland FM1.

《Supplement》
At least a part of the above-described embodiment and various modifications may be combined arbitrarily with each other. In addition, the embodiments disclosed this time should be considered as examples in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope of equivalence to the scope of claims.

1 Array (concentrator photovoltaic panel)
REFERENCE SIGNS LIST 100 concentrator photovoltaic power generation device 11 housing 11a upper surface 11b lower surface 111 bottom plate 111a through hole 112 frame 12 condensing portion 12a lens element 13 light receiving portion 13a wiring 13b power generation portion 13c power generation portion 14 shielding portion 14a shielding portion 14b shielding portion 14c Shielding Part 141 Shielding Area 142 Passing Area 143 Shielding Plate 144 First Area (Opening)
145 second region (aperture)
15 Sealing Part 15a Sealing Plate 15b Supporting Part 2 Supporting Mechanism 21 Post 22 Foundation 23 Driving Part 24 Horizontal Axis 25 Tracking Base 25a Reinforcing Material 25b Rail 31 Package 32 Power Generation Element 33 Lead Frame 34 Lead Frame 35 Wire 36 Support Part (Lens support)
37 protective plate 37a opening 37b inner peripheral end 38 secondary lens 39 sealing resin 370 shielding plate 370a opening (first region)
370b edge 370c gap (second area)
371 shield plate 371a opening (first region)
371c gap (second region)
372 Shielding plate 372a Opening (first region)
372c opening (second region)
M1 concentrating photovoltaic module M1a concentrating photovoltaic module B1 junction box Ax1 optical axis L1 direct sunlight L1a direct sunlight L1b direct sunlight L2 scattered light R1 area R2 area R3 area P1 focus position P2 focus position P3 focus position θ1 First angle θ2 Second angle S1 Gap F1 Focal length D1 Distance FS1 Farming system FM1 Farmland SN1 Sign board

Claims (12)

a housing having a bottom plate provided with a through hole;
a light receiving portion including a plurality of power generation elements and provided on the bottom plate while avoiding the through hole;
a condensing unit provided on the upper part of the housing, including a plurality of lens elements for respectively converging direct sunlight onto the plurality of power generation elements;
a shielding portion provided between the light collecting portion and the light receiving portion and having a shielding region and a passing region;
a sealing portion that seals the housing by covering the bottom plate from below;
with
The shielding region blocks light from the direct sunlight that is focused by the lens element to a position away from the power generating element,
the passing area allows passage of light of the direct sunlight focused on the power generation element by the lens element and scattered light incident on the lens element from an angle different from that of the direct sunlight;
The sealing portion transmits the scattered light that has passed through the passage region and the through hole.
Concentrated photovoltaic module. A gap is formed between the sealing portion and the bottom plate,
The concentrator photovoltaic module of claim 1 . The gap is at least twice the thickness of the bottom plate,
3. The concentrator photovoltaic module of claim 2. The bottom plate is made of metal,
A portion of the sealing portion that transmits the scattered light is made of resin,
The concentrator photovoltaic module according to claim 2 or 3. The shielding area includes a shielding plate that shields sunlight,
The passage area includes an opening formed in the shield plate,
The concentrator photovoltaic module according to any one of claims 1 to 4. The shielding area includes a plurality of the shielding plates,
The passing region includes a first region that passes light focused on the power generating element and a second region that passes the scattered light,
The first region is the opening,
The second region is a gap between the plurality of shielding plates,
6. The concentrator photovoltaic module of claim 5. The light receiving unit is
a secondary lens for further condensing the light converged by the lens element onto the power generation element;
a lens supporting portion that supports the secondary lens on the power generating element;
The shielding plate is provided on the lens support,
wherein the secondary lens is provided in the aperture;
The concentrator photovoltaic module according to claim 5 or 6. Further comprising a signboard portion provided on the lower surface of the bottom plate and visible through the sealing portion,
The concentrator photovoltaic module according to any one of claims 1 to 7. The sealing portion includes a diffusion portion that diffuses the scattered light,
The concentrator photovoltaic module according to any one of claims 1 to 8. The sealing portion includes a color filter portion that absorbs light of a predetermined wavelength out of the scattered light,
The concentrator photovoltaic module according to any one of claims 1 to 9. An array configured by assembling a plurality of the concentrating photovoltaic modules according to any one of claims 1 to 10,
Concentrator photovoltaic device. The concentrator photovoltaic power generation device according to claim 11 installed in farmland,
The concentrator photovoltaic power generation device blocks the direct sunlight with the shielding area or the light receiving section, and supplies the scattered light that has passed through the passage area and the through hole and through the sealing section to the farmland. do,
farming system.

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