High concentration photovoltaic device based on tempered glass fresnel lens

Abstract

The utility model relates to optical and photovoltaic technical field, concretely is a kind of high-power condensing photovoltaic device based on toughened glass fresnel lens, comprising: toughened glass fresnel lens, adopt sodium calcium super white glass double-sided toughened and become, one side surface is set as smooth surface, the other side surface is formed through heating mould pressing and is formed with fresnel, realize high-power condensing through fresnel, photovoltaic chip is used to accept the sunlight focused by toughened glass fresnel lens, and power is exported through wire.The utility model solves the pain point that traditional lens weatherability is poor, glass lens weight is big, can replace silicon wafer, acrylic lens, is convenient for maintenance and use, greatly improves the optical efficiency and energy density of condensing photovoltaic system, can also be used for lighting, aviation, aerospace field.

Description

Technical Field

[0001] This utility model relates to the fields of optics and photovoltaic technology, specifically a high-concentration photovoltaic device based on tempered glass Fresnel lenses. Background Technology

[0002] Traditional solar photovoltaic (PV) power generation relies on large-area PV modules to directly receive sunlight. Limited by the photoelectric conversion efficiency of semiconductor materials, the theoretical limit for monocrystalline silicon is approximately 29%, making it difficult to increase power generation per unit area. Concentrated photovoltaic (CPV) technology focuses sunlight through optical lenses, increasing power generation by 3-10 times, but it faces the following technical bottlenecks:

[0003] (1) Defects of optical lenses: Traditional glass lenses are spherical lenses, which are heavy and have high processing costs; plastic lenses are prone to aging and yellowing and have insufficient weather resistance; although Fresnel lenses are lightweight, they are mostly injection molded, and the surface precision is difficult to meet the requirements of high magnification light concentration.

[0004] (2) Insufficient thermal management and reliability: High concentration of light can cause local temperature rise of photovoltaic chips to reach more than 80°C. Traditional metal brackets have low heat dissipation efficiency, and long-term operation can easily lead to chip efficiency degradation.

[0005] (3) Low structural integration: Most existing focusing systems adopt a separate design, with insufficient connection strength between the lens and the frame and heat dissipation components, poor adaptability to wind and hail and other environments, and high operation and maintenance costs.

[0006] (4) Difficult to clean: The sealed structure allows water vapor and dust to enter, making it difficult to clean and affecting service life.

[0007] Therefore, there is an urgent need for a new type of lens that balances optical efficiency, structural reliability, and environmental adaptability, as well as a concentrated photovoltaic device. Utility Model Content

[0008] The present invention aims to overcome the shortcomings of the prior art and provide a high-concentration photovoltaic device based on tempered glass Fresnel lenses, the technical solution of which is as follows.

[0009] High-concentration photovoltaic devices based on tempered glass Fresnel lenses include:

[0010] Tempered glass Fresnel lenses are made of double-sided tempered soda-lime ultra-white glass. One surface is set as a smooth surface, while the other surface is formed with Fresnel patterns through heating and molding. The Fresnel patterns achieve high light concentration.

[0011] Photovoltaic chips are used to receive sunlight focused by tempered glass Fresnel lenses and output electricity through wires.

[0012] Furthermore, it also includes:

[0013] The frame has a horizontally extended frame at the top, and a slot is provided along the inner edge of the frame, into which the edge of the tempered glass Fresnel lens is inserted.

[0014] The base plate is horizontally fixed at the bottom of the frame, and has mounting holes in the middle that are aligned with the focal point of the tempered glass Fresnel lens. The photovoltaic chips are detachably installed in the mounting holes.

[0015] The heat sink is detachably mounted on the bottom surface of the base plate and is attached to the bottom surface of the photovoltaic chip;

[0016] It also includes a light shield covering the top of the photovoltaic chip, which is detachably installed on the top surface of the base plate, and has a light-passing port in the middle that is aligned with the optical axis of the tempered glass Fresnel lens.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) Fresnel lenses made of tempered glass solve the problems of poor weather resistance and heavy weight of traditional lenses. They can replace silicon wafers in concentrated photovoltaic technology, with a photovoltaic efficiency of 73-85%, which is 3 to 4 times that of silicon wafers. They can replace acrylic lenses in deserts, and their service life is more than 6 times that of acrylic lenses. They are easy to maintain and use.

[0019] (2) It significantly improves the optical efficiency and energy density of the concentrated photovoltaic system, and the power generation per unit area is 2-5 times higher than that of the non-concentrated system. It greatly reduces the cost of land and equipment occupation, is easy to clean and maintain, and is suitable for distributed energy and power supply scenarios in remote areas such as deserts. It can also be used in lighting, aviation and aerospace fields.

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a high-concentration photovoltaic device in this utility model.

[0022] Figure 2 This is a schematic diagram of the tempered glass Fresnel lens in this utility model.

[0023] Figure 3 This is another structural schematic diagram of the high-concentration photovoltaic device in this utility model.

[0024] Figure 4 yes Figure 3 Schematic diagram of the structure of a medium-to-high concentration photovoltaic device.

[0025] As shown in the figure:

[0026] Frame 1, Lens frame 2, Slot 21, Tempered glass Fresnel lens 3, Fresnel pattern 31, Base plate 4, Mounting hole 41, Photovoltaic chip 5, Wire 6, Heat sink 7, Sunshade 8, Light passage 81 Detailed Implementation

[0027] like Figure 1 and Figure 2 As shown, this utility model provides a high-concentration photovoltaic device based on a tempered glass Fresnel lens, including a tempered glass Fresnel lens 3, which is made of double-sided tempered soda-lime ultra-white glass. One side of the lens is set as a smooth surface, and the other side is formed with Fresnel patterns 31 by heating and molding. High-concentration light is achieved through the Fresnel patterns. The device also includes a photovoltaic chip 5, which is used to receive the sunlight focused by the tempered glass Fresnel lens 3 and output power through a wire 6.

[0028] The high-concentration photovoltaic device based on tempered glass Fresnel lenses, which adopts the above-mentioned technical solution, solves the problems of poor weather resistance and heavy weight of traditional lenses by using Fresnel lenses made of tempered glass. It can replace silicon wafers in concentrated photovoltaic technology, and the photovoltaic energy efficiency can reach 73-85%, which is 3 to 4 times that of silicon wafers. It can replace acrylic lenses in deserts, and its service life is more than 6 times longer than that of acrylic lenses, and it is easy to maintain and use.

[0029] The aforementioned high-concentration photovoltaic device based on tempered glass Fresnel lenses can also be applied to lighting, aviation, and aerospace fields for high-efficiency photovoltaic power supplies.

[0030] For details, please refer to Figure 3 and Figure 4 As shown, in one embodiment, the high-concentration photovoltaic device based on tempered glass Fresnel lenses of this invention further includes:

[0031] The frame 1 has a horizontally extended mirror frame 2 at its top. The inner edge of the mirror frame 2 has a slot 21, and the edge of the tempered glass Fresnel lens 3 is embedded in the slot 21 on the inner edge of the mirror frame 2.

[0032] The base plate 4 is horizontally fixed at the bottom of the frame 1, and has a mounting hole 41 in the middle that is aligned with the focal point of the tempered glass Fresnel lens 3. The photovoltaic chip 5 is detachably installed in the mounting hole 41.

[0033] The heat sink 7 is detachably mounted on the bottom surface of the base plate 4 and is attached to the bottom surface of the photovoltaic chip 5.

[0034] In the above embodiments, the Fresnel lens made of tempered glass solves the problems of poor weather resistance and heavy weight of traditional lenses. The tempered glass Fresnel lens 3 can be directly rinsed with water, making cleaning and maintenance simple and suitable for distributed energy and power supply scenarios in remote areas such as deserts.

[0035] In the above embodiments, the tempered glass Fresnel lens 3 is made by glass heating and molding, which is a mature process for industrial production of Fresnel lenses. Therefore, this utility model will not elaborate further.

[0036] In a preferred embodiment, a light-shielding cover 8 is also included, covering the top of the photovoltaic chip 5. The light-shielding cover 8 is detachably mounted on the top surface of the base plate 4, and a light-passing port 81 is provided in the middle of the light-shielding cover 8, which is aligned with the optical axis of the tempered glass Fresnel lens 3. In fact, the top of the photovoltaic chip 5 has a relatively concentrated area as a heat energy collection point, and the light-passing port 81 is used to correspond to the aforementioned heat energy collection point, which can shield stray light interference to a certain extent.

[0037] In another preferred embodiment, the tempered glass Fresnel lens 3 is coated with an anti-reflective film on its smooth surface, achieving a light transmittance of over 97.5%, which significantly reduces light energy loss and greatly improves the optical efficiency of the concentrated photovoltaic system.

[0038] Optionally, the antireflective coating is made of alternating SiO2 and MgF2 deposits with a total thickness of 50-100 nm.

[0039] Preferably, the tempered glass Fresnel lens 3 is double-sided tempered, with a surface compressive stress ≥100MPa.

[0040] In one exemplary embodiment, the Fresnel pattern on the bottom surface of the tempered glass Fresnel lens 3 has a depth of 0.3-0.5 mm, a duty cycle of 0.6-0.8, and a focal length of f=300-500 mm, which can achieve a light concentration ratio of 80-120 times.

[0041] It is understandable that by designing the parameters of the tempered glass Fresnel lens 3, a high light concentration ratio of up to 1000 times can be achieved, which will significantly improve the energy density of the concentrated photovoltaic system and increase the power generation per unit area by 2-5 times compared with the non-concentrated system.

[0042] In another preferred embodiment, a butyl rubber sealing ring (not shown in the figure) is provided in the groove 21 along the inner edge of the frame 2, and the edge of the lens is tightly fitted to the groove 21 by the butyl rubber sealing ring.

[0043] In another preferred embodiment, the inner wall of the light shield 8 is provided with Fresnel diffraction microstructures to filter out stray light and homogenize the incident light field, avoiding edge light distortion and hot spot effect, thereby further improving the utilization rate of light energy received by the photovoltaic chip by 20%-25%.

[0044] Furthermore, the inner wall of the light shield 8 is coated with a diffuse reflection coating with a reflectivity of ≤5% to improve the filtering effect of stray light.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-concentration photovoltaic device based on tempered glass Fresnel lenses, characterized in that, include: Tempered glass Fresnel lenses are made of double-sided tempered soda-lime ultra-white glass. One surface is set as a smooth surface, while the other surface is formed with Fresnel patterns through heating and molding. The Fresnel patterns achieve high light concentration. Photovoltaic chips are used to receive sunlight focused by tempered glass Fresnel lenses and output electricity through wires.

2. The high-concentration photovoltaic device based on tempered glass Fresnel lenses according to claim 1, characterized in that, Also includes: The frame has a horizontally extended frame at the top, and a slot is provided along the inner edge of the frame, into which the edge of the tempered glass Fresnel lens is inserted. The base plate is horizontally fixed at the bottom of the frame, and has mounting holes in the middle that are aligned with the focal point of the tempered glass Fresnel lens. The photovoltaic chips are detachably installed in the mounting holes. The heat sink is detachably mounted on the bottom surface of the base plate and is attached to the bottom surface of the photovoltaic chip; It also includes a light shield covering the top of the photovoltaic chip, which is detachably installed on the top surface of the base plate, and has a light-passing port in the middle that is aligned with the optical axis of the tempered glass Fresnel lens.

3. The high-concentration photovoltaic device according to claim 2, characterized in that, The smooth surface of the tempered glass Fresnel lens is coated with an anti-reflective film, which is made of alternating SiO2 and MgF2, with a total thickness of 50-100nm.

4. The high-concentration photovoltaic device according to claim 1, characterized in that, The Fresnel pattern on the bottom surface of tempered glass Fresnel lenses has a depth of 0.3-0.5mm and a duty cycle of 0.6-0.

8.

5. The high-concentration photovoltaic device according to claim 1, characterized in that, A butyl rubber sealing ring is provided in the slot along the inner edge of the frame, and the edge of the lens is tightly fitted to the slot through the butyl rubber sealing ring.

6. The high-concentration photovoltaic device according to claim 1, characterized in that, The inner wall of the light shield is equipped with Fresnel diffraction microstructures.

7. The high-concentration photovoltaic device according to claim 1, characterized in that, The inner wall of the sunshade is coated with a diffuse reflection coating with a reflectivity of ≤5%.

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