Toughened glass Fresnel lens and high-concentration photovoltaic device
By integrating tempered glass Fresnel lenses with high-concentration photovoltaic devices, the problems of heavy lenses, poor weather resistance, and difficult cleaning in traditional photovoltaic systems are solved, achieving high-efficiency photovoltaic power generation and long lifespan, and is suitable for multiple application scenarios.
Patent Information
- Application Number
- CN202511124435.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-11-07
AI Technical Summary
In traditional photovoltaic power generation systems, optical lenses are heavy and costly, plastic lenses have poor weather resistance, high-concentration photovoltaic chips cause temperature rise, the system structure has low integration, cleaning and maintenance are difficult, and photovoltaic efficiency and reliability are affected.
It uses tempered glass Fresnel lenses, which are formed by heating and molding to create Fresnel patterns. Combined with the design of the frame, heat sink and sunshade, it achieves high light concentration and effective heat dissipation. The anti-reflective coating on the lens surface improves light efficiency, and the sealing ring at the lens edge ensures stability.
It improves photovoltaic energy efficiency to 73-85%, extends service life by more than 6 times, reduces operation and maintenance costs, and is suitable for distributed energy and power supply in remote areas. It is also used in lighting, aviation, and aerospace fields.
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Figure CN120908911A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of optical and photovoltaic technology, in particular to a tempered glass Fresnel lens and a high-magnification concentrating photovoltaic device using the tempered glass Fresnel lens. BACKGROUND
[0002] Traditional solar photovoltaic power generation relies on large-area photovoltaic components to directly receive sunlight, and is limited by the photoelectric conversion efficiency of semiconductor materials, with a theoretical limit of about 29% for single-crystal silicon, making it difficult to break through the power generation per unit area. Concentrating photovoltaic technology focuses sunlight through optical lenses, which can increase power generation by 3-10 times, but has the following technical bottlenecks:
[0003] (1) Optical lens defects: 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 high-magnification concentrating requirements.
[0004] (2) Insufficient heat management and reliability: high-magnification concentration can cause local temperature rise of photovoltaic chips to be above 80°C, and the low heat dissipation efficiency of traditional metal supports can easily cause chip efficiency decay during long-term operation.
[0005] (3) Low structural integration: existing concentrating systems mostly use a separate design, and the connection strength of the lens, frame, and heat dissipation components is insufficient, with poor environmental adaptability such as wind and hail resistance, 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 the service life.
[0007] Therefore, there is an urgent need for a new lens that takes into account optical efficiency, structural reliability, and environmental adaptability, as well as a concentrating photovoltaic device. SUMMARY
[0008] The present application aims to overcome the shortcomings of the prior art and provides a tempered glass Fresnel lens, which includes a lens body made of tempered sodium-calcium super-white glass, one side surface of the lens body is provided with a smooth surface, and the other side surface is formed with a Fresnel pattern by heating and molding. The lens body achieves high-magnification concentration through the Fresnel pattern.
[0009] Based on the same technical concept, in another technical solution, the tempered glass Fresnel lens includes a lens body made of tempered sodium-calcium super-white glass, one side surface of the lens body is provided with a smooth surface, and the other side surface is formed with a Fresnel pattern by heating and molding. The lens body achieves high-magnification concentration through the Fresnel pattern.
[0010] Based on the above-mentioned tempered glass Fresnel lens achieving high-magnification concentration through the Fresnel pattern, the present application further provides a high-magnification concentrating photovoltaic device, which includes:
[0011] The tempered glass Fresnel lens has a smooth top surface.
[0012] The photovoltaic chip is used for receiving the focused sunlight of the tempered glass Fresnel lens and outputs electricity through an electric wire.
[0013] Further, the high-magnification light-concentrating photovoltaic device further comprises:
[0014] The frame is provided with a horizontally arranged frame, and a clamping groove is arranged in the frame, and the edge of the tempered glass Fresnel lens is embedded in the clamping groove of the frame.
[0015] The bottom plate is horizontally arranged at the bottom of the frame, and the middle part is provided with a mounting hole aligned with the focal point of the tempered glass Fresnel lens, and the photovoltaic chip is detachably mounted in the mounting hole.
[0016] The heat sink is detachably mounted on the bottom surface of the bottom plate and is attached to the bottom surface of the photovoltaic chip.
[0017] Further, the light shield cover covering the top of the photovoltaic chip is detachably mounted on the top surface of the bottom plate, and the middle part of the light shield cover is provided with a light passing opening aligned with the optical axis of the tempered glass Fresnel lens.
[0018] Compared with the prior art, the present application has the following beneficial effects:
[0019] (1) The Fresnel lens made of tempered glass solves the problems of poor weather resistance and heavy weight of traditional lenses, and can replace silicon wafers in light-concentrating photovoltaic technology, and the photovoltaic energy efficiency can reach 73-85%, which is 3 to 4 times that of silicon wafers. In the desert, it has a service life more than 6 times that of acrylic lenses, and is easy to maintain and use.
[0020] (2) The optical efficiency and energy density of the light-concentrating photovoltaic system are greatly improved, the unit area power generation power is 2-5 times that of non-concentrating system, the land and equipment occupation cost is greatly reduced, the cleaning and maintenance are simple, and it is suitable for distributed energy and power supply scenes in remote areas such as deserts, and can also be used in lighting, aviation and aerospace fields.
[0021] In the following, the present application will be further described in conjunction with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a structural schematic diagram of the tempered glass Fresnel lens in the present application.
[0023] Figure 2 is a structural schematic diagram of a high-magnification light-concentrating photovoltaic device in the present application.
[0024] Figure 3 is another structural schematic diagram of the high-multiple-concentration photovoltaic device in the application.
[0025] Figure 4 is Figure 3 is a structural exploded schematic diagram of the high-multiple-concentration photovoltaic device.
[0026] shown in the figure:
[0027] frame 1, mirror frame 2, clamping groove 21, tempered glass Fresnel lens 3, lens body 31, Fresnel pattern 32, bottom plate 4, mounting hole 41, photovoltaic chip 5, wire 6, heat sink 7, light shield 8, light passage 81, DETAILED DESCRIPTION
[0028] As Figure 1 shown, the application provides a tempered glass Fresnel lens, which comprises a lens body 31, the lens body 31 is tempered by sodium-calcium super-white glass, one side surface of the lens body 31 is provided as a smooth surface, and the other side surface is formed into a Fresnel pattern 32 by heating and molding, and the lens body 31 realizes high-multiple-concentration or floodlighting through the Fresnel pattern 32.
[0029] When the lens body of the above-mentioned tempered glass Fresnel lens realizes high-multiple-concentration through the Fresnel pattern, it can be used as a lens in high-multiple-concentration photovoltaic technology or other application scenarios in which a convex lens is replaced by a Fresnel lens.
[0030] When the lens body of the above-mentioned tempered glass Fresnel lens realizes floodlighting through the Fresnel pattern, it can be used as a lens in projection technology or other application scenarios in which a concave lens is replaced by a Fresnel lens.
[0031] As Figure 2 shown, based on the lens body of the above-mentioned tempered glass Fresnel lens that realizes high-multiple-concentration through the Fresnel pattern, the application further provides a high-multiple-concentration photovoltaic device, which comprises the aforementioned tempered glass Fresnel lens 3, the lens body of which realizes high-multiple-concentration through the Fresnel pattern, and the top surface of which is a smooth surface; and further comprises a photovoltaic chip 5 for receiving sunlight focused by the tempered glass Fresnel lens 3 and outputting electric power through a wire 6.
[0032] The high-multiple-concentration photovoltaic device adopting the above-mentioned technical solution solves the problems of poor weather resistance and large weight of glass lenses in traditional lenses by using a Fresnel lens made of tempered glass, can replace silicon wafers in high-multiple-concentration photovoltaic technology, and has a photovoltaic energy efficiency of 73-85%, which is 3 to 4 times that of silicon wafers. In the desert, it replaces acrylic lenses and has a service life more than 6 times that of acrylic lenses, is convenient to maintain and use. The above-mentioned high-multiple-concentration photovoltaic device can also be applied to the fields of lighting, aviation and aerospace for high-efficiency photovoltaic power supply.
[0033] Specifically, refer to Figure 3 andFigure 4 As shown in the embodiment, the high-concentration photovoltaic device of the present application further comprises:
[0034] A frame 1, the top of which is provided with a horizontally stretched mirror frame 2, the inner side of which is provided with a clamping groove 21, and the edge of the tempered glass Fresnel lens 3 is embedded in the clamping groove 21 of the inner side of the mirror frame 2;
[0035] A bottom plate 4, which is horizontally and fixedly arranged at the bottom of the frame 1, and has a mounting hole 41 at the middle part thereof, which is aligned with the focal point of the tempered glass Fresnel lens 3, and the photovoltaic chip 5 is detachably mounted in the mounting hole 41;
[0036] A heat sink 7, which is detachably mounted on the bottom surface of the bottom plate 4 and is in close contact with the bottom surface of the photovoltaic chip 5.
[0037] In the above embodiment, the Fresnel lens made of tempered glass solves the problem of poor weather resistance and large weight of traditional lenses, and the tempered glass Fresnel lens 3 can be directly washed with water, which is simple to clean and maintain, and is suitable for distributed energy and power supply scenarios in remote areas such as deserts.
[0038] In the above embodiment, the tempered glass Fresnel lens 3 is made by glass heating and molding, which is a mature technology for industrial production of Fresnel lenses, and therefore, the present application will not be expanded.
[0039] In a preferred embodiment, it further comprises a light shield 8 covering the top of the photovoltaic chip 5, which is detachably mounted on the top surface of the bottom plate 4, and the middle part of the light shield 8 is provided with a light passing opening 81 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 collection point, and the light passing opening 81 is used to correspond to the aforementioned heat collection point, which can shield the interference of stray light to a certain extent.
[0040] In another preferred embodiment, the light surface of the tempered glass Fresnel lens 3 is coated with an anti-reflection film, and the light transmittance can reach more than 97.5%, which significantly reduces the loss of light energy and greatly improves the optical efficiency of the concentrated photovoltaic system.
[0041] Optionally, the anti-reflection film is made of SiO2 and MgF2 alternately coated, and the total thickness is 50-100 nm.
[0042] Preferably, the tempered glass Fresnel lens 3 is treated by double-sided tempering, and the surface compressive stress is ≥100 MPa.
[0043] In an exemplary embodiment, the depth of the Fresnel pattern on the bottom surface of the tempered glass Fresnel lens 3 is 0.3-0.5 mm, the duty cycle is 0.6-0.8, and the focal length f=300-500 mm, which can obtain a concentration ratio of 80-120 times.
[0044] It can be understood 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 greatly improve the energy density of the concentrated photovoltaic system and increase the power generation per unit area by 2-5 times compared with non-concentrating systems.
[0045] In another preferred embodiment, a butyl rubber sealing ring (not shown in the figure) is arranged in the clamping groove 21 along the inner edge of the frame 2, and the edge of the lens is tightly fitted with the clamping groove 21 through the butyl rubber sealing ring.
[0046] In another preferred embodiment, the inner wall of the light shield 8 is provided with a Fresnel diffraction microstructure for filtering stray light and homogenizing the incident light field, avoiding edge light distortion and hot spot effect, and further improving the light energy utilization rate of the photovoltaic chip by 20%-25%.
[0047] Further, the inner wall of the light shield 8 is coated with a diffuse reflection coating with a reflectivity of ≤5% for improving the filtering effect of stray light.
[0048] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. Tempered glass Fresnel lens, characterized in that, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
2. Tempered glass Fresnel lens, characterized in that, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
3. High concentration photovoltaic device, characterized in that, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
4. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
5. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
6. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
7. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
8. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
9. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern.
10. The high concentration photovoltaic device of claim 3, wherein, The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens body is tempered by sodium-calcadium super-white glass; one side surface of the lens body is a smooth surface; the other side surface is formed into a Fresnel pattern through heating and mould pressing; and the lens body realizes high-multiple light condensation through the Fresnel pattern. The application relates to a tempered glass Fresnel lens, which comprises a lens body, wherein the lens