Back glass and photovoltaic module

Abstract

The utility model provides a back glass and a photovoltaic module, the back glass is provided with a longitudinally penetrating through hole, the through hole is used for a battery piece outgoing line to pass through, the edge of the through hole at one side of a battery piece is processed with an inclined plane, and the height of the inclined plane gradually increases from the edge of the through hole to the direction far away from the edge of the through hole. According to the back glass provided by the utility model, the structure of the through hole through which the outgoing line passes is improved, and the inclined surface is processed on the edge of the through hole which is originally smooth and flat. The inclined plane can change the incident angle and the reflection angle of the light, so that more light is reflected to the battery piece. In addition, the inclined plane can increase the surface area of the edge of the through hole of the back glass, and improves the scattering and reflection of light, thereby improving the light absorptivity and the energy conversion efficiency of the cell panel.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation, and in particular to a back glass and a photovoltaic module. Background Art

[0002] With the development of science and technology, more and more attention has been paid to the utilization of energy. The role of photovoltaic power generation technology in life has become more and more prominent. Photovoltaic power generation technology can convert light energy into electrical energy, making full use of the energy of nature.

[0003] Solar photovoltaic power generation is an emerging clean and efficient new energy. As solar photovoltaic cells begin to spread from the military and aerospace fields to industry, commerce, agriculture, communications, household appliances and public utilities, their convenience and flexibility are particularly suitable for remote areas, mountains, deserts, islands and rural areas, showing a strong market demand.

[0004] However, photovoltaic glass, one of the key components of solar photovoltaic power generation technology, even the currently widely used high-reflection glazed glass, only directly reflects the incident light through the glaze layer at the middle lead-out position, such as Figure 1 As shown, the reflected light path is consistent with the incident light path, and the light can hardly be reflected on the battery cell, which will reduce the light absorption rate and the energy conversion efficiency of the battery panel to a certain extent. Utility Model Content

[0005] In order to solve one of the above technical problems, the utility model provides a back glass and a photovoltaic module.

[0006] A first aspect of an embodiment of the utility model provides a back glass, on which a through hole is opened vertically penetrating the back glass, the through hole is used to pass the lead-out wire of the battery cell, and the through hole is located at the edge of one side of the battery cell and is processed with a bevel, and the bevel faces the battery cell.

[0007] Preferably, the inclined surface is semi-conical as a whole.

[0008] Preferably, the inclined surface has an axial length of 0.3 mm to 0.8 mm along the through hole.

[0009] Preferably, the inclined surface has a radial width of 15 mm to 25 mm along the through hole.

[0010] Preferably, the angle between the inclined surface and the rear glass surface is 3° to 7°.

[0011] Preferably, the through hole is a cylindrical through hole.

[0012] Preferably, the width of the through hole is 5 mm to 15 mm.

[0013] A second aspect of an embodiment of the utility model provides a photovoltaic module, which includes a front glass, an adhesive film, a battery cell, a glaze layer and the back glass described in the first aspect of the embodiment of the utility model, wherein the front glass, the battery cell and the back glass are arranged in sequence from top to bottom, and the adhesive film is filled between the front glass and the battery cell, and between the battery cell and the back glass, and the outer surface of the back glass is coated with a glaze layer.

[0014] Preferably, the back glass is tempered ultra-clear rolled glass.

[0015] The beneficial effects of the utility model are as follows: the back glass proposed by the utility model is improved in structure at the through hole through which the lead wire passes, and a bevel is processed on the originally smooth and flat edge of the through hole. The bevel can change the incident angle and reflection angle of light, so that more light is reflected onto the battery cell. In addition, the bevel can also increase the surface area at the edge of the through hole of the back glass, improve the scattering and reflection of light, thereby improving the light absorption rate and the energy conversion efficiency of the battery panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the structure of the back glass in the prior art;

[0018] Figure 2 This is a schematic diagram of the structure of the back glass described in Example 1 of the utility model;

[0019] Figure 3 This is a schematic diagram of the position of the through hole described in Example 1 of the utility model;

[0020] Figure 4 This is a schematic structural diagram of the photovoltaic assembly described in Example 2 of the utility model.

[0021] Reference numerals:

[0022] 1. Through hole, 2. Bevel, 3. Front glass, 4. Adhesive film, 5. Battery cell, 6. Back glass, 7. Glaze layer. DETAILED DESCRIPTION

[0023] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0024] Example 1

[0025] like Figure 2 and Figure 3 As shown, this embodiment proposes a back glass, which can be used in a photovoltaic module and used as the glass on the back of a cell. A through hole 1 is provided on the back glass. The through hole 1 runs through the back glass, and the axial direction of the through hole 1 is perpendicular to the back glass. The through hole 1 is used as a lead-out line for the cell. A bevel 2 is processed at the edge of the through hole 1 on one side of the cell. The bevel 2 faces the cell.

[0026] Specifically, Figure 3 As shown, a through hole 1 is opened on the back glass for passing the lead wire of the battery cell. Figure 2 It is a cross-sectional view of the back glass. It can be seen that the through hole 1 passes through the back glass, and the axial direction of the through hole 1 is perpendicular to the back glass. A bevel 2 is processed at the edge of the through hole 1 on the upper surface of the back glass. The bevel 2 can be a conical structure. The conical bevel 2 is easier to process and is also more conducive to reflecting light onto the battery cell to improve the power generation rate of the battery cell. The bevel 2 can be a conical bevel 2, a pyramidal bevel 2, etc., which is not particularly limited in this embodiment.

[0027] In this embodiment, the through hole 1 of the back glass and the bevel 2 at the edge of the through hole 1 can be processed by laser processing. The laser processing can use a femtosecond laser, with a central wavelength of 615nm, a pulse width of 169fs, a laser pulse with a single pulse energy of 1mJ, and a repetition frequency of 1kHz. The bevel 2 can be completed by laser processing together with the through hole 1, and the manufacturing process is convenient and fast.

[0028] More specifically, in this embodiment, the through hole 1 is a cylindrical through hole 1, which is easy to process. The width of the through hole 1 is 5 mm to 15 mm. Considering the space occupied by the battery cell lead wire and processing parameters, the width or diameter of the through hole 1 can be selected to be 10 mm.

[0029] For the inclined surface 2, the length of the inclined surface 2 along the axial direction of the through hole 1 is 0.3mm-0.8mm. Considering the thickness of the back glass, light reflection and other factors, the length of the inclined surface 2 along the axial direction of the through hole 1 can be selected to be 0.5mm. Figure 2In the cross-sectional view shown, the radial width of the bevel 2 along the through hole 1 is 15mm to 25mm. Similarly, considering factors such as the thickness of the back glass, light reflection, and the size of the through hole 1, the radial width of the bevel 2 along the through hole 1 can be selected to be 20mm. The angle between the bevel 2 and the back glass surface is 3° to 7°. Considering factors such as light reflection, the optimal angle between the bevel 2 and the back glass surface can be selected to be 5.71°. The bevel 2 makes the edge of the through hole 1 have a certain inclination angle. Compared with the conventional through hole 1 with a right angle edge, this embodiment reduces the stress of the battery cell at the edge of the through hole 1, reduces the risk of laminated breakage, and improves the safety of battery cell assembly to a certain extent.

[0030] In this embodiment, the structure of the through hole 1 through which the lead wire passes is improved, and a bevel 2 is processed on the edge of the originally smooth and flat through hole 1. The bevel 2 can change the incident angle and reflection angle of the light, so that more light is reflected onto the battery cell. In addition, the bevel 2 can also increase the surface area at the edge of the through hole 1 on the back glass, improve the scattering and reflection of light, and thus improve the light absorption rate and the energy conversion efficiency of the battery panel.

[0031] Example 2

[0032] like Figure 4 As shown, this embodiment provides a photovoltaic module, which includes a front glass 3, a film 4, a battery cell 5, a glaze layer 7 and a back glass 6. The front glass 3, the battery cell 5 and the back glass 6 are arranged in sequence from top to bottom. The film 4 is filled between the front glass 3 and the battery cell 5, and between the battery cell 5 and the back glass 6. The outer surface of the back glass 6 is coated with a glaze layer 7.

[0033] Specifically, in this embodiment, the specific structure of the back glass 6 can refer to the content recorded in Example 1, and this embodiment will not be repeated. The back glass 6 can be made of tempered ultra-clear rolled glass, which is an ultra-transparent low-iron glass, also known as low-iron glass, high-transparency glass, with a light transmittance of more than 91.5%, and has excellent physical, mechanical and optical properties. Figure 4 It can be seen from the cross-sectional structure of the photovoltaic module shown that the light is irradiated vertically on the inclined surface 2. Regardless of whether it is reflected at the incident angle α or refracted at the incident angle α through the glaze layer 7 at the exit angle γ, this part of the light can be irradiated on the battery cell 5, thereby improving the light absorption rate.

[0034] In addition, the through hole 1 and the inclined surface 2 form a funnel-shaped structure, which can not only reflect light to the battery cell 5, but also facilitate the air inside the component to be pressed out along the direction of the funnel-shaped structure, thereby extracting the air in the funnel-shaped structure during the lamination process to reduce internal bubbles. In addition, it should be noted that before lamination, high-temperature cloth or high-temperature tape needs to be pasted at the position of the through hole 1 and the inclined surface 2 to prevent the adhesive film 4 from overflowing synchronously when the through hole 1 is evacuated.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A back glass, wherein a through hole is provided on the back glass and vertically penetrates the back glass, and the through hole is used to pass a lead wire of a battery cell, characterized in that: The through hole is processed with a chamfer at the edge of one side of the battery cell, and the chamfer faces the battery cell.

2. The back glass according to claim 1, characterized in that: The inclined surface is in a semi-conical shape as a whole.

3. The back glass according to claim 1, characterized in that: The inclined surface has an axial length of 0.3 mm to 0.8 mm along the through hole.

4. The back glass according to claim 1, characterized in that: The radial width of the inclined surface along the through hole is 15 mm to 25 mm.

5. The back glass according to claim 1, characterized in that: The angle between the inclined surface and the rear glass surface is 3° to 7°.

6. The back glass according to claim 1, characterized in that: The through hole is a cylindrical through hole.

7. The back glass according to claim 1, characterized in that: The through hole has a width of 5 mm to 15 mm.

8. A photovoltaic module, characterized in that: The photovoltaic module includes front glass, adhesive film, battery cells, glaze layer and back glass as described in any one of claims 1 to 7, wherein the front glass, battery cells and back glass are arranged in sequence from top to bottom, adhesive film is filled between the front glass and the battery cells, and between the battery cells and the back glass, and the outer surface of the back glass is coated with a glaze layer.

9. The photovoltaic module according to claim 8, characterized in that: The back glass is tempered ultra-clear rolled glass.

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