CN102280511A - A dense array concentrated solar photovoltaic device - Google Patents

Abstract

A dense array concentrated solar photovoltaic device, belonging to the field of photovoltaics, comprising a Fresnel lens array, a planar substrate and at least two photovoltaic cells; the Fresnel lens array is on the top layer; the Fresnel lens array is a Integral lens, the upper surface is plane, and the lower surface has at least two sets of serrations in the shape of concentric rings; each set of concentric rings forms a Fresnel lens, and all the Fresnel lenses form an array; the planar substrate is arranged on the bottom layer; The at least two photocells are arranged on the upper surface of the planar substrate and arranged in a photocell array, the number of photocells in the photocell array is the same as the number of Fresnel lenses in the Fresnel lens array, and each photocell Corresponds to a Fresnel lens. The array type concentrating solar photovoltaic device provided by the invention has the advantages of simple heat dissipation, short concentrating focal length, high utilization rate of solar energy and no need to arrange electrodes inside the photovoltaic cell chip.

Description

A dense array concentrated solar photovoltaic device

technical field

The invention relates to the field of photovoltaics, in particular to a dense array concentrated solar photovoltaic device.

Background technique

Solar energy is one of the most valuable clean energy sources and an important part of the future basic energy. Solar photovoltaic power generation technology directly converts solar energy into electrical energy.

However, the price of solar power generation systems has remained high for a long time, mainly due to the low density of solar energy and the low conversion efficiency of solar cells. In order to reduce the price of solar power generation systems, high-power concentrating solar photovoltaic power generation technology has emerged as the times require. Concentrating photovoltaic power generation technology amplifies the received solar energy by hundreds or thousands of times through transmission or reflection, and then focuses the amplified energy on small photocells with extremely high efficiency. This technology uses a large-area, cheap concentrating device to replace expensive and short-supply monocrystalline silicon raw materials, thereby achieving the goal of greatly reducing the cost of solar photovoltaic power generation, making solar photovoltaic power generation capable of competing with conventional energy sources. Light weight, 30-40% higher year-on-year power generation than flat-panel batteries, half the year-on-year price of flat-panel batteries, easy installation, long service life, high reliability, beautiful appearance, easy to be combined and installed in a wide range to form large-scale photovoltaic power generation Therefore, concentrating photovoltaic power generation technology has become the main trend of solar photovoltaic power generation technology in the future.

In the prior art, the transmissive concentrating photovoltaic power generation mainly uses a traditional Fresnel lens as a concentrating optical element to focus a large amount of sunlight onto a multi-segment solar photovoltaic cell. In order to collect more sunlight to achieve a high concentration ratio, the Fresnel lenses used for concentrated photovoltaic power generation in the prior art are usually relatively large in diameter (for example: 50mm×50mm), while the diameter of traditional Fresnel lenses is difficult to enlarge. In addition, since the focused light spot is very small (for example, focused to 2mm×2mm), the solar energy radiated to each photovoltaic cell chip is highly concentrated, and it is easy to damage or even burn out the photovoltaic cell chip. In order to make the distribution of the solar intensity focused on the solar cells uniform, it is generally necessary to add a secondary uniformity device to this kind of concentrating photovoltaic device. In addition, the existing concentrating photovoltaic devices using large-diameter Fresnel lenses also have disadvantages such as long focal lengths that prevent miniaturization of photovoltaic devices, and the need to arrange electrodes in the photovoltaic chip.

Contents of the invention

The embodiment of the present invention provides a dense array concentrating solar photovoltaic device, which is used to solve the problems of difficult heat dissipation of solar cells, long focal length of concentrating light and internal arrangement of photovoltaic cell chips in the existing large-diameter Fresnel concentrating photovoltaic power generation technology. electrodes etc. The array type concentrating solar photovoltaic device provided by the present invention has the advantages of simple heat dissipation, short concentrating focal length, and high solar energy utilization rate without needing to arrange electrodes inside the photovoltaic cell chip.

A dense array concentrated solar photovoltaic device includes: a Fresnel lens array 1 , a planar substrate 2 and at least two photovoltaic cells 3 .

The Fresnel lens array 1 is on the top layer; the Fresnel lens array 1 is an integral lens, the upper surface is a plane, and the lower surface has at least two groups of identical concentric ring-shaped serrations; each group is identical The concentric rings form a Fresnel lens, and all Fresnel lenses form an array.

The planar substrate 2 is disposed on the bottom layer.

The at least two photocells 3 are arranged on the upper surface of the planar substrate 2 and arranged in a photocell array, the number of photocells 3 in the photocell array and the number of Fresnel lenses in the Fresnel lens array 1 are the same, and each photocell 3 corresponds to a Fresnel lens.

Each photocell 3 is located on the focus spot of the Fresnel lens corresponding to the photocell 3 .

The peripheral shape of the lower surface of each Fresnel lens is square, the lower surfaces of any two Fresnel lenses are completely consistent, and the lower surfaces of each Fresnel lens are closely arranged without division.

Each photocell 3 is made of a thin metal sheet 4 and a light-receiving region 5 nested in the center of the metal sheet 4; the area of the light-receiving region 5 of any one of the photocells 3 is smaller than the lower surface of the corresponding Fresnel lens of the photocell 3 area, the current output electrode 6 of the photovoltaic cell 3 is arranged on the thin metal sheet 4 of each photovoltaic cell 3 .

The planar substrate 2 includes: a metal heat dissipation bottom plate 9 and an insulating heat dissipation film 8 coated thereon; the photovoltaic cell 3 is fixed on the metal heat dissipation bottom plate 9 through the insulation heat dissipation film 8 .

The thermal expansion coefficient of the metal heat dissipation bottom plate 9 is the same as that of the metal sheet 4 .

The device also includes at least two compound curved mirrors located between the Fresnel lens array 1 and the planar substrate 2 .

The at least two composite curved mirrors are closely arranged to form a composite curved mirror array, and the number of composite curved mirrors in the composite curved mirror array is the same as the number of photocells 3 in the photocell array; the bottom of each composite curved mirror emits light A photocell 3 is sealed at the opening, and the upper opening is sealed to the lower surface of the Fresnel lens corresponding to the photocell 3, and the inner surface of each of the composite curved mirrors is a reflective surface.

The compound curved reflector is a compound parabolic reflector 10 .

The compound curved reflector is a compound hyperboloid reflector 11 .

The device also includes at least two funnel-shaped plano-convex lenses 12 located between the Fresnel lens array 1 and the planar substrate 2 .

The above-mentioned plano-convex lenses 12 are closely arranged into a plano-convex lens array, and the number of the plano-convex lenses 12 in the plano-convex lens array is the same as the number of the photocells 3 in the photocell array; each of the plano-convex lenses 12 corresponds to a photocell 3 and is connected with The corresponding Fresnel lens of this photovoltaic cell 3, and the optical axis of each described plano-convex lens 12 coincides with the optical axis of its corresponding Fresnel lens; The size of the plane end of each described plano-convex lens 12 and its corresponding The light-receiving area of the photocell 3 is equal, and the plane end is close to the light-receiving area 5 of the photocell 3; the convex end of each plano-convex lens 12 is not in contact with the lower surface of its corresponding Fresnel lens, and The aperture of the convex end is equal to the aperture of the Fresnel lens corresponding to the plano-convex lens 12 .

The side of the plano-convex lens 12 is coated with a reflective layer.

Compared with the existing concentrated photovoltaic power generation technology using large-diameter Fresnel lenses, the above-mentioned array concentrated solar photovoltaic device provided by the embodiment of the present invention has the following advantages:

1. The light intensity on the photocell is reduced and dispersed and dissipated, and there is no need for a secondary uniform light device.

2. The focus spot is small, and the requirement for the accuracy of sun tracking is reduced. In the case of having the same light-gathering ratio as the large-aperture Fresnel lens, the use area of the photovoltaic cell is greatly reduced.

3. The photovoltaic chip does not contain electrodes, and the electrodes are only arranged on the periphery of the photovoltaic chip, so that the utilization rate of solar energy can be improved.

4. The focal length of the Fresnel lens can be made very small, which effectively reduces the height of the photovoltaic power generation module and is conducive to the miniaturization of the device.

On the basis of the above-mentioned advantages, for the array type concentrating solar photovoltaic device provided by the embodiment of the present invention with the compound curved surface mirror, the solar tracking device is no longer needed, and the utilization rate of solar energy is further improved.

On the basis of the above advantages, for the arrayed concentrating solar photovoltaic device with plano-convex lenses provided by the embodiment of the present invention, the concentrating focal length is further shortened, and the utilization rate of solar energy is further improved.

Description of drawings

Fig. 1 is a schematic structural diagram of a dense array concentrated solar photovoltaic device provided by Embodiment 1 of the present invention;

Fig. 2 is the lower surface schematic view of Fresnel lens array 1 in Fig. 1;

Fig. 3 is the A-A sectional view of the arrayed concentrated solar photovoltaic device shown in Fig. 1;

Fig. 4 is a schematic structural diagram of another array concentrated solar photovoltaic device provided by Embodiment 1 of the present invention;

Fig. 5 is a schematic diagram of the connection between a photovoltaic cell 3 and a planar substrate 2 used as a heat sink;

Fig. 6 is one of the structural schematic diagrams of an array concentrated solar photovoltaic device with a compound parabolic reflector provided by Embodiment 2 of the present invention;

Fig. 7 is the second structural schematic diagram of the array concentrated solar photovoltaic device provided by the second embodiment of the present invention with a compound parabolic reflector;

Fig. 8 is one of the structural schematic diagrams of the arrayed concentrating solar photovoltaic device provided by the second embodiment of the present invention with a compound hyperboloid reflector;

Fig. 9 is the second structural schematic diagram of the arrayed concentrating solar photovoltaic device provided by the second embodiment of the present invention with a compound hyperboloid reflector;

Fig. 10 is one of the structural schematic diagrams of the arrayed concentrating solar photovoltaic device with plano-convex lenses provided by Embodiment 3 of the present invention;

Fig. 11 is the second structural schematic diagram of the arrayed concentrating solar photovoltaic device with plano-convex lenses provided by the third embodiment of the present invention;

In the figure: 1. Fresnel lens array, 2. Planar substrate, 3. Photocell, 4. Metal sheet, 5. Light receiving area, 6. Electrode, 7. Insulation tape, 8. Insulation and heat dissipation film, 9. Metal heat dissipation base plate , 10, compound parabolic reflector, 11, compound hyperboloid reflector, 12, plano-convex lens.

Detailed ways

An embodiment of the present invention provides a dense array concentrated solar photovoltaic device, in which a Fresnel lens array composed of several small-diameter Fresnel lenses is used to replace the large-diameter Fresnel lens in the prior art, and the In the prior art, the photocell corresponding to the large-diameter Fresnel lens is reduced to several small photocells respectively corresponding to the Fresnel lens in the Fresnel lens array, which solves the problem of the short focusing focal length and local problems on the photocell in the prior art. The problem of too much heat concentration. In particular, the Fresnel lens array provided by the embodiment of the present invention is an integral lens.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one

FIG. 1 is a schematic structural diagram of a dense array concentrated solar photovoltaic device provided by Embodiment 1 of the present invention. The device includes: a Fresnel lens array 1 , a planar substrate 2 and at least two photovoltaic cells 3 .

The Fresnel lens array 1 is on the top layer, which is a whole lens, the upper surface is a plane, and the lower surface has at least two groups of identical serrations in the shape of concentric rings, and each group of identical concentric rings forms a Fresnel lens, all Fresnel lenses form an array. The planar substrate 2 is disposed on the bottom layer. The photocells 3 are arranged on the upper surface of the planar substrate 2 and arranged in the form of a photocell array, the number of photocells 3 in the photocell array is the same as the number of Fresnel lenses in the Fresnel lens array 1, and each photocell corresponds to a Fresnel lens . Specifically, each photocell 3 is located at the focus spot of its corresponding Fresnel lens. In FIG. 1 , multiple parallel arrows above the Fresnel lens array 1 represent vertically incident sunlight, that is, the direction indicated by the arrows is the direction of the optical axis of the Fresnel lens.

In fact, the Fresnel lens arrays described in this embodiment and all subsequent embodiments are arrays of M×N rows, where both M and N are positive integers, and M and N are not 1 at the same time . Without loss of generality, for the convenience of representation below, the Fresnel lens array is represented as a 3×4 matrix in the drawings of all embodiments of the present invention for illustration.

FIG. 2 is a schematic diagram of the lower surface of the Fresnel lens array 1 in FIG. 1 . It can be seen from FIG. 2 that the lower surface of each Fresnel lens in the Fresnel lens array 1 has concentric annular serrations and the outer shape is square, and the lower surfaces of all the Fresnel lenses are closely arranged without division.

In the existing concentrating photovoltaic power generation technology using large-diameter Fresnel lenses, considering the requirements for tracking the sun, although the focus spot is small, the photovoltaic chip still needs to be designed to be relatively large. In this case, the magnitude of the photogenerated current generated on the light-receiving surface of the photovoltaic cell is uneven and cannot be transmitted across the entire photovoltaic cell to its outer edge. The current output electrodes are arranged in the photovoltaic cell chip, which increases the complexity of the production process of the photovoltaic cell, and also makes the distribution of the effective light-receiving surface of the photovoltaic cell uneven.

In order to solve the problems in the prior art and effectively improve the utilization rate of solar energy, the photovoltaic cell in the array concentrated solar photovoltaic device provided by Embodiment 1 of the present invention is composed of a metal sheet and a light-receiving area nested in the center of the metal sheet , specifically as shown in Figure 3. Fig. 3 is an A-A sectional view of the array concentrated solar photovoltaic device shown in Fig. 1 . Wherein, the light-receiving region 5 of each photocell 3 is nested in the center of the metal sheet 4, and the area of the light-receiving region 5 of any photocell 3 is smaller than the lower surface area of the Fresnel lens corresponding to the photocell 3, and each photocell 3 The current output electrode 6 of the photovoltaic cell 3 is arranged on the thin metal sheet 4 . In FIG. 3 , for convenience, only four electrodes 6 are drawn without drawing the actual connection lines of the electrodes 6 . During specific implementation, the number of electrodes and the connection lines can be set according to actual needs.

Preferably, any two adjacent photovoltaic cells 3 are insulated and isolated by insulating tape 7 , as shown in FIG. 4 .

Preferably, in the array type concentrating solar photovoltaic device provided by Embodiment 1 of the present invention, the planar substrate 2 can also be used as a cooling plate in addition to being used as a fixing plate for the photovoltaic cells 3 . FIG. 5 is a schematic diagram of the connection between a photovoltaic cell 3 and a planar substrate 2 used as a heat sink. As shown in FIG. 5 : when the planar substrate 2 is used as a heat dissipation plate, the planar substrate 2 may include an insulating heat dissipation film 8 and a metal heat dissipation bottom plate 9 . The photovoltaic cell 3 is fixed on the metal heat dissipation bottom plate 9 through the insulating heat dissipation film 8 . The insulating and heat-dissipating film 8 is used to make good thermal contact between the photovoltaic cell 3 and its electrode circuit and the metal heat-dissipating bottom plate 9 without conducting electricity. In the prior art, due to uneven light received by the photovoltaic cell, the photovoltaic cell is locally heated and easily burns out the photovoltaic cell chip. The small photocell chip corresponds to each Fresnel lens, which reduces the light intensity focused on each photocell and avoids excessive concentration of heat on the photocell. Obviously, after choosing a reasonable metal heat dissipation base plate, the heat dissipation problem of the photocell On the basis of the above, it is further optimized and solved.

Preferably, the thermal expansion coefficient of the metal heat dissipation bottom plate 9 is the same as that of the metal sheet 4 in the photovoltaic cell 3, so that when the temperature changes, the expansion of the metal sheet 4 and the metal heat dissipation bottom plate 9 is consistent and uniform, so that each metal sheet The electrical connection between them will not be disconnected when the temperature changes.

To sum up, compared with the existing concentrated photovoltaic power generation technology using large-diameter Fresnel lenses, the above-mentioned array concentrated solar photovoltaic device provided by Embodiment 1 of the present invention has the following advantages:

1. Due to the small condensing aperture, the energy radiated to each photocell is small after condensing, which can disperse and dissipate heat, and at the same time, there is no need for a secondary homogenization device.

2. Make full use of the concentrating effect of the concentrating lens, and usually can focus to a very small spot (for example, the focusing factor can reach 10,000 times). Since the Fresnel lens has a relatively small aperture, the photocell chip is relatively large compared to the spot, so Can effectively reduce the accuracy of sun tracking. In addition, since the focused light spot is small, the usage area of the photocell in the prior art is greatly reduced under the condition of having the same light-gathering ratio as the large-diameter Fresnel lens.

3. The photovoltaic chip does not contain electrodes, and the electrodes are only arranged on the periphery of the photovoltaic chip, so that the utilization rate of solar energy can be improved.

4. Since the existing large-diameter Fresnel lens is converted into a plurality of small-diameter Fresnel lens arrays in the photovoltaic device provided by Embodiment 1 of the present invention, each Fresnel lens in Embodiment 1 of the present invention The focal length of the ear lens can be made very small (for example, ten times smaller than the conventional large-diameter Fresnel lens), so that the height of the photovoltaic power generation module can be effectively reduced, which is conducive to the miniaturization of the device, and is very convenient for transportation and installation. .

Embodiment two

Considering that when the arrayed concentrating solar photovoltaic device provided by Embodiment 1 of the present invention is applied to a photovoltaic power generation system that does not use a solar tracking device, if the height of the sun changes, the sunlight incident on the Fresnel lens array will be non-perpendicular , at this time, part of the marginal rays cannot reach the light-receiving area of the photocell corresponding to each Fresnel lens after being refracted by each effective Fresnel lens, and the utilization rate of solar energy is reduced. In order to solve this problem, on the basis of the first embodiment above, the second embodiment of the present invention provides another dense array concentrated solar photovoltaic device. Added to the solar photovoltaic device: at least two compound curved reflectors located between the Fresnel lens array 1 and the planar substrate 2 . The at least two composite curved mirrors are closely arranged to form a composite curved mirror array, and the number of composite curved mirrors in the composite curved mirror array is the same as the number of photocells 3 in the photocell array. A photocell 3 is sealed at the light outlet at the bottom of each compound curved reflector, and the upper opening is sealed to the lower surface of the Fresnel lens corresponding to the photocell 3 , and the inner surface of each compound curved reflector is a reflective surface.

The incident sunlight reaches the light exit hole at the bottom through several reflections in this kind of composite curved surface mirror, and the light loss is small. Especially, it can effectively collect the obliquely incident sunlight to achieve the maximum theoretical concentration ratio. The operation of this kind of concentrator It does not need to track the position of the sun at any time, but only needs to adjust the orientation according to the season. The structure is simple and the operation is convenient. Since the compound curved mirror concentrator is a mature technology in the solar concentrating technology, no further explanation is given here.

The array type concentrating solar photovoltaic device provided in the second embodiment can also have various additional technical features described in the first embodiment, such as using a planar substrate as a heat sink at the same time, etc., which will not be described in detail here.

Preferably, the compound curved reflector is a compound parabolic reflector (CPC, Compound Parabolic Collector) whose section is a parabola, as shown in FIG. One of the structural schematic diagrams of solar photovoltaic devices, the device shown in Figure 6 is an array concentrated solar photovoltaic device with several compound parabolic reflectors 10 added on the basis of the device shown in Figure 1 . FIG. 7 is the second schematic diagram of the structure of an arrayed concentrating solar photovoltaic device with a compound parabolic reflector provided by Embodiment 2 of the present invention. In this device, any two adjacent photovoltaic cells 3 are insulated and isolated by an insulating tape 7 .

Preferably, the compound hyperbolic reflector is a compound hyperbolic reflector (CHC, Compound Hyperbolic Collector) with a hyperbolic section, as shown in FIG. One of the schematic diagrams of the structure of an array concentrated solar photovoltaic device, the device shown in Figure 8 is an array concentrated solar photovoltaic device obtained by adding several compound hyperboloid mirrors 11 on the basis of the device shown in Figure 1 . FIG. 9 is the second schematic diagram of the structure of an arrayed concentrating solar photovoltaic device with a compound hyperboloid mirror provided by an embodiment of the present invention. In this device, any two adjacent photovoltaic cells 3 are insulated and isolated by an insulating tape 7 .

Obviously, the array concentrated solar photovoltaic device with compound curved reflector provided by the embodiment of the present invention also has the advantages of the array concentrated solar photovoltaic device without compound curved reflector mentioned above, although the structure is more complicated Some, but this kind of device can be used in photovoltaic systems without solar tracking devices, and the utilization rate of solar energy is higher.

Embodiment Three

Similar to the second embodiment, in order to further improve the solar energy utilization rate of the array concentrated solar photovoltaic device provided by the first embodiment, on the basis of the first embodiment, the third embodiment of the present invention provides another dense array concentrated solar photovoltaic device. Solar photovoltaic device, this kind of device adds at least two funnel-shaped plano-convex lenses to any dense array concentrated solar photovoltaic device provided in Embodiment 1.

FIG. 10 is one of the structural schematic diagrams of the arrayed concentrating solar photovoltaic device with plano-convex lenses provided by Embodiment 3 of the present invention. It can be seen from FIG. 10 that on the basis of the device shown in FIG. 1 , at least two funnel-shaped plano-convex lenses 12 located between the Fresnel lens array 1 and the planar substrate 2 are added. The at least two plano-convex lenses 12 are closely arranged into a plano-convex lens array, and the number of plano-convex lenses 12 in the plano-convex lens array is the same as the number of photocells 3 in the photocell array; each plano-convex lens 12 corresponds to a photocell 3 and is connected with the photocell 3 Corresponding Fresnel lens, and the optical axis of each plano-convex lens 12 coincides with the optical axis of its corresponding Fresnel lens; The size of the plane end of each plano-convex lens 12 is equal to the light-receiving area of its corresponding photocell, and The plane end is close to the light-receiving area 5 of its corresponding photocell 3; the convex end of each plano-convex lens 12 is not in contact with the lower surface of its corresponding Fresnel lens, and the diameter of the convex port is the same as that of the Fresnel lens. The caliber of the ear lenses is equal. In the direction of the optical axis of the Fresnel lens, there is a certain air gap between the Fresnel lens array 1 and the plano-convex lens array.

Preferably, the side of the plano-convex lens is coated with a reflective layer for reflecting sunlight incident on the side.

Obviously, each plano-convex lens 12 is firstly used as a convex lens for further focusing the sunlight refracted by its corresponding Fresnel lens onto their corresponding photocells; secondly, the plano-convex lens 12 with a reflective layer on its side can also After entering the plano-convex lens 12 , the sunlight incident on its side is further fully reflected back and forth and guided to the photocell 3 . In this way, when the altitude of the sun is low, the sunlight incident on the Fresnel lens array 1 can be refracted by the Fresnel lens and the plano-convex lens 12 to the photovoltaic cell as much as possible, and the solar energy utilization rate of the photovoltaic device is further improved.

Wherein, the plano-convex lens is made of transparent material.

The arrayed concentrating solar photovoltaic device provided in the third embodiment can also have various additional technical features described in the first embodiment, such as using a planar substrate as a heat sink, etc., which will not be described in detail here.

FIG. 11 is the second schematic diagram of the structure of the arrayed concentrating solar photovoltaic device with plano-convex lenses provided by the third embodiment of the present invention. In this device, any two adjacent photovoltaic cells 3 are insulated and isolated by an insulating tape 7 .

Obviously, the array concentrated solar photovoltaic device with compound curved reflector provided by the embodiment of the present invention not only has the advantages of the array concentrated solar photovoltaic device without compound curved reflector mentioned above, but also has With the use of the utility model, not only the utilization rate of solar energy is improved, but also the focusing focal length can be further shortened, and the device has a simple structure and is easy to realize.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. a closely spaced array formula concentrating solar photovoltaic device is characterized in that, comprising: array of fresnel lenses (1), planar substrates (2) and at least two photocells (3);

Described array of fresnel lenses (1) is in top layer; Described array of fresnel lenses (1) is an overall lens, and upper surface is the plane, and lower surface has the sawtooth of the identical one-tenth concentric ring-shaped of at least two groups; Described every group of identical donut forms a Fresnel lens, and all Fresnel lenses are formed array format;

Described planar substrates (2) is arranged at bottom;

Described at least two photocells (3) are arranged at the upper surface of described planar substrates (2) and arrange and are the photovoltaic cell arrays form, the number of the photocell in the described photovoltaic cell arrays (3) is identical with Fresnel lens number in the described array of fresnel lenses (1), and the corresponding Fresnel lens of every photocell (3);

Every described photocell (3) is positioned on the focal beam spot of the pairing Fresnel lens of this photocell (3).

2. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 1, it is characterized in that, the lower surface peripheral shape of each described Fresnel lens is square, and in full accord and each the Fresnel lens lower surface of the lower surface of any two Fresnel lenses does not have branch and cedes territory closely to be arranged in together.

3. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 2 is characterized in that, every photocell (3) is by sheet metal (4) and be nested in central light area (5) formation of described sheet metal (4); The area of the light area of arbitrary described photocell 3 (5) is less than the lower surface area of the pairing Fresnel lens of this photocell (3), and the sheet metal (4) of every photocell (3) is provided with the electric current output electrode (6) of described photocell (3).

4. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 3 is characterized in that described planar substrates (2) comprising: heat dissipation metal base plate (9) and plating insulating radiation film (8) thereon; Described photocell (3) is fixed on the described heat dissipation metal base plate (9) by insulating radiation film (8).

5. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 4, it is characterized in that: the thermal coefficient of expansion of described heat dissipation metal base plate (9) is identical with the thermal coefficient of expansion of described sheet metal (4).

6. as each described a kind of closely spaced array formula concentrating solar photovoltaic device in the claim 1 to 5, it is characterized in that this device also comprises at least two compound curved surface speculums that are positioned between described array of fresnel lenses (1) and the described planar substrates (2);

Described at least two compound curved surface speculums closely are arranged in the compound curved surface reflection mirror array, and the number of the photocell (3) in the compound curved surface speculum number in the compound curved surface reflection mirror array and the photovoltaic cell arrays is identical; A photocell of bottom light-emitting window place sealing-in (3) of each compound curved surface speculum, upper end open are packaged on the pairing Fresnel lens lower surface of described photocell (3), and the inner surface of each described compound curved surface speculum is a reflecting surface.

7. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 6 is characterized in that described compound curved surface speculum is composite parabolic speculum (10).

8. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 6 is characterized in that described compound curved surface speculum is Composite Double curved reflector (11).

9. as each described a kind of closely spaced array formula concentrating solar photovoltaic device in the claim 1 to 5, it is characterized in that this device also comprises at least two funnel type planoconvex spotlights (12) that are positioned between described array of fresnel lenses (1) and the planar substrates (2);

Above-mentioned planoconvex spotlight (12) closely is arranged in the planoconvex spotlight array, and the number of the photocell (3) in the number of the planoconvex spotlight (12) in the described planoconvex spotlight array and the described photovoltaic cell arrays is identical; Each described planoconvex spotlight (12) corresponding to a photocell 3 and with the corresponding Fresnel lens of this photocell (3), and the optical axis coincidence of the optical axis Fresnel lens pairing of each described planoconvex spotlight (12) with it; The light areas of the size photocell pairing with it (3) of the planar ends of each described planoconvex spotlight (12) etc. are big, and described planar ends is close to the light area (5) of described photocell (3); The convex surface end of each described planoconvex spotlight (12) does not contact with the lower surface of its pairing Fresnel lens, and the bore of described convex surface end equates with the bore of the pairing Fresnel lens of this planoconvex spotlight (12).

10. a kind of closely spaced array formula concentrating solar photovoltaic device as claimed in claim 9 is characterized in that the side of described planoconvex spotlight (12) is coated with reflector layer.

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