CN100555672C - A kind of solar battery light collection cover - Google Patents

Abstract

A solar cell daylighting cover, comprising a central daylighting lens and an annular daylighting lens, characterized in that: the center daylighting lens adopts a plano-convex lens structure, the annular daylighting lens adopts an annular plano-convex lens structure with a certain height, and the center daylighting lens is located above the annular daylighting lens , and the size of the circular section surrounded by the lower surface of the central daylighting lens is consistent with the upper edge of the ring-shaped daylighting lens; the solar battery daylighting cover of the present invention is in use, when the sunlight incident angle is greater than or equal to 30 °, the central The gathering of sunlight by the daylighting lens enhances the efficiency of sunlight illumination; when the incident angle of sunlight is less than 30°, the solar cell can still receive enough light to generate electric energy by using the refraction of the sunray by the ring-shaped daylighting lens; at the same time, the invention The solar cell lighting cover also avoids the problem of reduced efficiency or even damage of solar cells due to partial shading.

Description

A kind of solar cell daylighting cover

technical field

The invention relates to an optical device, in particular to a solar cell daylighting cover.

Background technique

A solar cell is a device that responds to light and converts light energy into electricity. There are many materials that can produce photovoltaic effects, such as: single crystal silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, indium selenium copper, etc. , their power generation principles are basically the same, and the crystal is used as an example to describe the photovoltaic power generation process. P-type crystalline silicon can be doped with phosphorus to obtain N-type silicon, forming a P-N junction. When the light irradiates the surface of the solar cell, some photons are absorbed by the silicon material; the energy of the photons is transferred to the silicon atoms, causing the electrons to migrate and become free electrons to gather on both sides of the P-N junction to form a potential difference. This is "photovoltaic" When the external circuit is connected, under the action of the voltage, there will be a current flowing through the external circuit to generate a certain output power; the essence of this process is: the process of converting photon energy into electrical energy.

The output power of the solar cell is variable. At different times and in different places, the output power of the same solar cell is different. The peak power of the solar cell is determined by the local average solar radiation intensity and the terminal power load. Since the silicon material is relatively fragile, it is usually necessary to add a high-strength, high-transmittance glass material on the surface of the silicon material as a protective cover to form a complete solar cell. The strength and light transmittance of the protective cover also directly affect the service life and photoelectric conversion efficiency of solar cells.

In order to improve the photoelectric conversion efficiency of solar cells, the domestic utility model patent "03223205.5 - Solar LED street lamp device" designed a new type of solar LED street lamp structure and transmission device, using a solar cell follower device, driven by a motor to follow the solar cell The sun rotates and rotates to achieve the highest conversion efficiency of solar cells; however, the system is more complicated to implement, the cost is higher, and the reliability is lower, and the motor control system needs maintenance and electric drive, and the overall efficiency is not high, so it is not suitable for small Solar battery system use. Since the traditional flat solar cell protection cover is still used, it is impossible to effectively avoid the heat island effect caused by the partially shaded solar cells from reducing or damaging the output power of the solar cells.

The utility model patent "01270896.8 - Solar Elevated Street Lighting Device" designed the overall structure of the elevated solar street light. The system uses a quasi-ellipsoidal plexiglass cover as the protective cover for the solar cells, which effectively prevents the solar cells from being blocked alone (such as leaves, bird droppings, etc.) ) will cause permanent damage to the solar cells caused by the heat island effect; the solar cells in this system are installed horizontally, which cannot solve the problem of low photoelectric conversion efficiency of the solar cells when the incident angle of sunlight is small.

Contents of the invention

The technical problem to be solved by the present invention is: aiming at the deficiencies in the prior art, provide a solar cell daylighting cover with a simple structure, which can effectively realize the refraction of sunlight, even when the incident angle of sunlight is small, so that the sunlight incident on the The light intensity on the surface of the solar cell can still exert a relatively high photoelectric conversion efficiency, and can also avoid damage to the solar cell due to the heat island effect caused by partial shading of the solar cell.

The technical solution adopted by the present invention to solve the technical problems: a solar cell daylighting cover, comprising a central daylighting lens 1 and an annular daylighting lens 2, characterized in that: the center daylighting lens 1 adopts a plano-convex lens structure, and the annular daylighting lens 2 adopts a certain High degree of annular plano-convex lens structure, the central lighting lens 1 is located above the annular lighting lens 2, and the lower surface of the central lighting lens 1 is the same size as the circular section surrounded by the upper edge of the annular lighting lens 2.

The solar cell daylighting cover is in the shape of a spherical shell.

Described central daylighting head mirror 1 and the intersection of ring daylighting lens 2 any point and the circular cross-section center circle that the bottom edge of ring daylighting lens 2 surrounds and the circle that the bottom edge of ring daylighting lens 2 surrounds The angle between the normals of the cross-section is 60°.

The central daylighting lens 1 is capable of converging solar rays with an incident angle greater than or equal to 30°.

The annular daylighting lens 2 can realize the refraction of the sunlight whose incident angle is less than 30°.

The principle of the present invention: light will be refracted when passing through the lens, and the convex lens uses this principle to converge parallel light rays to the focal point to increase the light intensity. A solar battery lighting cover designed by the present invention uses the refraction principle of the lens to take sunlight The angle between the incident light and the circular section surrounded by the lower edge of the ring-shaped lighting lens is the incident angle of sunlight. The light with a large angle converges to the surface of the solar cell fixed in the center of the daylighting cover to increase the energy of sunlight, thereby improving the photoelectric conversion efficiency; when the sun rises or falls, the incident angle of sunlight is small, and the ring-shaped lighting lens also adopts a ring-shaped plano-convex lens Realize the refraction of light, and refract the light with a small incident angle of sunlight to the surface of the solar cell fixed in the center of the daylight cover to increase its photoelectric conversion efficiency.

Compared with the prior art, the present invention has the advantages: the solar battery daylighting cover designed by the invention has a simple structure, and is composed of a central daylighting lens and an annular daylighting lens, which can increase the photoelectric conversion when the sunlight incident angle is small Efficiency, can improve the light intensity when sunlight incident angle is bigger again, make the photoelectric conversion performance of solar cell further improve; Moreover, solar cell daylighting cover of the present invention can also effectively prevent solar cell from being blocked separately (as leaves, bird droppings, etc.) ) resulting in permanent damage to solar cells caused by the heat island effect.

Description of drawings

Fig. 1 is the front view of solar cell daylighting cover structure of the present invention;

Fig. 2 is the bottom view of solar cell lighting cover structure of the present invention;

Fig. 3 is the A-A sectional view of the solar cell daylighting cover of the present invention;

Fig. 4 is a schematic diagram of the installation relationship between the solar cell daylighting cover and the solar cell of the present invention;

Fig. 5 is a schematic diagram of light refraction of the solar cell daylighting cover of the present invention.

Among the figure, 1 is the central lighting lens, 2 is the annular lighting lens, 3 represents the light when the sunlight incident angle is relatively large, 4 represents the light when the sunlight incident angle is small, 5 is the solar cell, and 6 is the fixed plate.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

A solar battery lighting cover of the present invention is composed of a central lighting lens 1 and an annular lighting lens 2. The central lighting lens 1 adopts a plano-convex lens structure; the annular lighting lens 2 adopts an annular lens structure with a certain height, and the central lighting lens 1 is located in a Above the lighting lens 2, and the size of the circular section surrounded by the lower surface of the central lighting lens 1 and the upper edge of the annular lighting lens 2 is consistent, ensuring that they can be connected together in good condition, and the annular lighting lens 2 section is also It is a plano-convex lens; the shape of the solar cell daylighting cover of the present invention is a spherical shell shape, and its front view is as shown in Figure 1, and its bottom view is as shown in Figure 2, and the A-A to sectional view is as shown in Figure 3,

The central daylighting lens 1 of the solar cell daylighting cover and the junction of the ring-shaped daylighting lens 2 take any point and the circular section surrounded by the midpoint of the circular section below the ring-shaped daylighting lens 2 and the lower edge of the ring-shaped daylighting lens 2 The angle between the normals is 60°, as shown in Figure 3.

The implementation of the solar battery lighting cover in this embodiment will be described in detail below, the solar battery is fixed on the central position of the solar battery panel, the axis of the solar battery lighting cover is corresponding to the middle of the solar battery panel, and the solar battery lighting cover is bonded On the positive surface of the solar panel, as shown in Figure 4, put the bonded device on the horizontal plane, and take the angle between the sun's rays and the horizontal plane as the angle of incidence of sunlight, that is, the angle between the sun's rays and the plane of the solar panel. Angle is the sunlight incidence angle; when the sunlight incidence angle is greater than or equal to 30°, since the central lighting lens 1 of the solar cell lighting cover adopts a plano-convex lens structure, the central lighting lens 1 can gather the sunlight to the surface of the solar cell to increase the light intensity and improve the performance of the solar cell; when the sun rises and falls, when the sunlight incident angle is less than 30°, the section of the annular lighting lens 2 of the solar cell lighting cover is also a plano-convex lens , using the refraction effect of the annular lighting lens 2 to refract the sun’s rays to the surface of the solar cell, increasing the incident angle and light intensity of the light, so that the solar cell can still obtain enough light energy to generate electricity when the incident angle is less than 30°, as shown in the figure 5, and the solar cell daylighting cover of the present invention can also effectively prevent the permanent damage to the solar cell caused by the heat island effect caused by the solar cell being shaded alone (such as leaves, bird droppings, etc.).

Claims (5)

1, a kind of solar battery light collection cover, comprise center daylighting lens (1) and annular daylighting lens (2), it is characterized in that: center daylighting lens (1) adopt the planoconvex spotlight structure, annular daylighting lens (2) adopt has the annular flat convex lens structures of certain altitude, center daylighting lens (1) are positioned at the top of annular daylighting lens (2), and the circular cross-section that is surrounded of the lower surface of center daylighting lens (1) and the top edges of annular daylighting lens (2) is big or small consistent.

2, a kind of solar battery light collection cover according to claim 1 is characterized in that: described solar battery light collection cover be shaped as the spherical shell shape.

3, a kind of solar battery light collection cover according to claim 1 is characterized in that: appointing the angle of getting a bit with the normal of the circular cross-section that lower edge surrounded of the line at the circular cross-section center that lower edge surrounded of annular daylighting lens (2) and annular daylighting lens (2) at the intersection of center daylighting lens (1) and annular daylighting lens (2) is 60 °.

4, a kind of solar battery light collection cover according to claim 1 is characterized in that: center daylighting lens (1) can be realized angle of incidence of sunlight converging more than or equal to 30 ° sunray.

5, a kind of solar battery light collection cover according to claim 1 is characterized in that: annular daylighting lens (2) can be realized the refraction of angle of incidence of sunlight less than 30 ° sunray.

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