High-strength photovoltaic glass and preparation method thereof

Abstract

The invention discloses high-strength photovoltaic glass which comprises a glass body and a silk screen which is arranged in the glass body and provided with a light trapping structure, the silk screen is composed of a plurality of silk threads, and the silk threads are located in gaps between grid lines of battery pieces and adjacent battery pieces after being projected in the glass body. According to the scheme, a silk screen structure is added in a traditional glass manufacturing process, similar to the structure of adding a reinforcement cage and the like in a house building, the strength of the glass can be greatly improved, the effects that the glass is broken but not lacked and cracked but not scattered can be achieved, and on this basis, the thickness of the glass can be properly thinned, and the strength of the glass is not affected. Besides, single silk threads forming the silk screen are provided with light trapping structures, reflection of light rays in the glass can be increased, under the standard test condition (STC), a photovoltaic module power tester is adopted for conducting electrical performance testing on the photovoltaic module, and compared with traditional glass, the power generation efficiency is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic glass, and in particular relates to a high-strength photovoltaic glass and a preparation method thereof. Background Art

[0002] At present, photovoltaic modules are developing towards lightweight, by reducing the weight of the modules and the load on the bracket system to adapt to more scenarios and application environments. However, in order to reduce weight and avoid damage, module companies usually add aluminum frames to double-glass modules and reduce the glass thickness to 2mm or even thinner. Compared with 3.2mm fully tempered glass, 2mm semi-tempered glass has poor impact resistance and has certain disadvantages in wind load and dynamic load. At the same time, in the production process of photovoltaic solar cell grid lines and modules, single cells are welded in series with welding ribbons, resulting in most of the sunlight irradiated on the grid lines and welding ribbon areas of the module cells being unable to be absorbed by the cells, reducing the light utilization rate.

[0003] In order to solve the above-mentioned problem of thin glass strength and extend the life of the components, it is necessary to propose a high-strength glass with high strength. When the glass is subjected to impact or sudden temperature changes, it will break without missing, crack without scattering, and avoid small pieces of sharp fragments from flying out and injuring people. At the same time, it has the function of shifting the light irradiated on the grid lines and welding strips of the battery cell to the effective light-receiving area of ​​the battery cell, and the irradiance of the obtained light in each effective light-receiving area of ​​the battery cell is relatively uniform, so as to make full use of the sunlight irradiated on the grid lines and welding strips of the battery cell and improve the power generation efficiency of the component. Summary of the invention

[0004] In order to solve the technical problem of low light utilization efficiency of the traditional glass in the background art, the main purpose of the present invention is to provide a high-strength photovoltaic glass that can solve the above problem.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a high-strength photovoltaic glass, comprising a glass body and a wire mesh with a light-trapping structure arranged in the glass body, the wire mesh is composed of a plurality of wires, and the wires are projected into the glass body and are located at the grid lines of the cell and / or the gaps between adjacent cell cells.

[0006] In this solution, a wire mesh structure is added to the traditional glass manufacturing process, which is similar to adding structures such as steel cages to house construction. This can greatly improve the strength of the glass, and achieve the effect of being broken without missing, and cracked without falling apart. Based on this, the thickness of the glass can be appropriately thinned without affecting its own strength. In addition, the individual wires that make up the wire mesh have a light-trapping structure that can increase the reflection of light in the glass. Under standard test conditions (STC), the photovoltaic module power tester is used to test the electrical performance of the photovoltaic module. Compared with traditional glass, the power generation efficiency is greatly improved. The glass structure in this solution is simple, without the involvement of too many components, and the effect is outstanding in actual use, which improves the utilization rate of light and the power generation efficiency of the battery cell module.

[0007] Furthermore, the light-trapping structure is a pyramid-shaped wire, that is, a triangular cross-section, and its side surfaces can reflect almost all vertically incident light and oblique light. After refraction, the light enters the light-receiving area of ​​the battery cell to generate electricity. Compared with the traditional structure, this can also be understood as increasing the utilization of light in the ineffective area of ​​the battery.

[0008] Furthermore, the glass body includes a front glass and a back glass, and the projection of the wires in the front glass is located at the grid lines on the cell and / or the gaps between adjacent cells; wherein the bottom angle formed by the wires projected at the gaps between adjacent cells and the glass horizontal plane is not less than 45°; the bottom angle of the wires in the back glass is not greater than 41.5°, and the projection is located at the gaps between adjacent cells. It can be understood that the wires at the grid lines are of a tall and thin structure, while the wires at the gaps are of a short and fat structure, and the wires in the front glass correspond to the grid line positions of the cell, and the grid line width is small, and a large projection area is not required. The angle between the side of the wires in the front glass corresponding to the gaps between adjacent cells and the horizontal plane of the glass is relatively large, which can effectively improve the efficiency of vertically incident reflected light entering the effective utilization area of ​​the cell; the angle between the side of the wires in the back glass and the horizontal plane of the glass is relatively small, ensuring that the light hits the wires and is reflected into the inside of the component and absorbed by the cell. On the other hand, in order to cover the gaps between adjacent cells faster and better, the projection area of ​​the back glass wires is also required to be slightly larger than the gaps between adjacent cells.

[0009] Furthermore, the wire mesh is composed of a first wire unit and a second wire unit, wherein the first wire unit includes a plurality of equally spaced wires, the second wire unit is composed of one wire, and there is a unit gap between the first wire unit and the second wire unit. The first wire unit corresponds to the position of the grid line of the battery cell, and the second wire unit is arranged at the gap of the battery cell, so as to increase the utilization rate of the gap light, so that the light can be evenly irradiated on each effective light receiving area of ​​the battery string, and the light amount of each section of the battery cell is kept consistent.

[0010] Furthermore, the first wire unit and the second wire unit are distributed in the same direction and extend along the grid lines of the battery cells and the gaps between adjacent battery cells respectively. Their respective projections can cover respectively, and the appearance shape can refract light into the effective area of ​​the battery cell to generate electricity at the same time.

[0011] The wire mesh is made of metal or other high-strength materials, which can ensure that the glass has high strength and hardness and is not easy to be damaged or split.

[0012] Furthermore, the silk screen is composed of a number of mutually parallel and perpendicular silk lines, and the number of the silk lines corresponds to the gaps between the grid lines of the battery cells and the gaps between the adjacent battery cells, so that they can be covered just when projected by light.

[0013] A method for preparing high-strength photovoltaic glass comprises the following steps:

[0014] S1. The raw materials for preparing the glass are mixed according to a certain weight ratio, transported to a mixing mixer, and uniformly stirred and mixed;

[0015] S2. Processing and melting: adding the mixed raw materials into the kiln and heating them at high temperature to form a uniform glass liquid without bubbles;

[0016] S3. Lay the metal mesh structure designed according to the component pattern flat in the middle of the furnace lip, and the glass liquid covers the metal mesh and flows out, and then cools and forms;

[0017] S4. Cut the formed glass.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] (1) Adding a wire mesh structure to the traditional glass production process is similar to adding a steel cage to a building, which can effectively improve the strength of the glass. Once the strength is guaranteed, the glass can be made thinner and lighter.

[0020] (2) The screen is composed of several silk threads with light trapping structures, which can effectively refract light, refracting the light that was originally irradiated to the gap between the grid line and the cell and cannot be used to the usable area, thereby improving the efficiency of light utilization;

[0021] (3) The light trapping structure is specifically a triangular pyramid shape with a wire cross section, and the base angles are different in the front glass and the back glass. It can effectively and conveniently project and cover the grid lines of the cell and the gaps between adjacent cells after being exposed to sunlight. The side can refract light to the effective area of ​​the cell to generate electricity, thereby improving the utilization rate of light.

[0022] (4) The screen is composed of a regular first wire unit and a second wire unit, and is arranged according to the distribution of the cells and the gap between the cells to improve the overall light utilization effect;

[0023] (5) Placing a high-strength wire mesh in the glass solution provides a new method for manufacturing high-strength glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of the wire in the front glass of the present invention;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the wires in the back glass of the present invention;

[0027] Figure 3 is a schematic diagram of the pyramid-shaped silk thread of the present invention when light is incident thereon;

[0028] Figure 4 It is a schematic diagram of the square wire in the present invention when light is incident thereon;

[0029] Figure 5 This is a schematic diagram of the structure of the first wire unit and the second wire unit in the present invention;

[0030] Explanation of reference numerals: 1 glass body; 2 wire; 3 light; 4 first wire unit; 5 second wire unit; 6 wire gap; 7 unit gap; 8 grid line; α bottom angle; 9 battery cell. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] like Figure 1-Figure 3 , Figure 5As shown, this embodiment provides a high-strength photovoltaic glass, including a glass body 1 and a wire mesh with a light-trapping structure arranged in the glass body 1, the wire mesh is composed of a plurality of wires 2, and the wires 2 are projected in the glass body 1 and are located at the grid lines 8 of the cell 9 and / or the gaps between adjacent cells 9. In this solution, the wire mesh structure is added to the traditional glass manufacturing process, which is similar to adding structures such as steel cages in house construction, which can greatly improve the strength of the glass, and can achieve the effect of breaking without missing, cracking without falling apart. Based on this, the thickness of the glass can be appropriately thinned without affecting its own strength. In addition, the single wire 2 constituting the wire mesh has a light-trapping structure, which can increase the reflection of the light 3 in the glass. Under standard test conditions (STC), the photovoltaic module power tester is used to test the electrical performance of the photovoltaic module. Compared with traditional glass, the power generation efficiency is greatly improved. The glass structure in this solution is simple, without the participation of too many components, and the effect is outstanding in actual use, which improves the utilization rate of the light 3 and the power generation efficiency of the cell 9 assembly.

[0034] Preferably, the light trapping structure is that the wire 2 is in the shape of a pyramid, that is, the appearance of a triangular cross section, and its side surface can reflect almost all vertical incident light and oblique light, and the light 3 enters the light receiving area of ​​the battery cell 9 after refraction to utilize the light 3 to generate electricity. Compared with the traditional structure, this can also be understood as increasing the light utilization of the ineffective area of ​​the battery. The glass body 1 includes a front glass and a back glass, and the projection of the wire 2 in the front glass is located at the grid line 8 on the battery cell and / or the gap between adjacent battery cells 9; wherein the bottom angle α formed by the wire 2 projected at the gap between adjacent battery cells 9 and the horizontal plane of the glass is not less than 45°; the bottom angle α of the wire 2 in the back glass is not greater than 41.5°, and its projection is located at the gap between adjacent battery cells 9. It can be understood that the wire 2 at the grid line 8 is a tall and thin structure, while the wire 2 at the gap is a short and fat structure, and the wire 2 in the front glass corresponds to the position of the grid line 8 of the battery cell 9, and the width of the grid line 8 is small, and a large projection area is not required. The angle between the side of the wire 2 in the front glass corresponding to the gap between adjacent cells 9 and the horizontal plane of the glass is relatively large, which can effectively improve the efficiency of the vertically incident reflected light 3 entering the effective utilization area of ​​the cell; the angle between the side of the wire 2 in the back glass and the horizontal plane of the glass is relatively small, ensuring that the light 3 hits the wire 2 and is reflected into the inside of the component and absorbed by the cell 9. On the other hand, in order to cover the gap between adjacent cells 9 faster and better, the projection area of ​​the back glass wire 2 is also required to be slightly larger than the gap between adjacent cells 9.

[0035] Preferably, the wire mesh is composed of a first wire unit 4 and a second wire unit 5, wherein the first wire unit 4 includes a plurality of equally spaced wires 2, the second wire unit 5 is composed of one wire 2, and a unit gap 7 is provided between the first wire unit 4 and the second wire unit 5. The first wire unit 4 corresponds to the position of the grid line 8 of the cell 9, and the second wire unit 5 is arranged at the gap of the cell 9, so as to increase the utilization rate of the gap light, so that the light 3 can be evenly irradiated on each effective light receiving area of ​​the cell string, and the light amount of each section of the cell 9 is kept consistent.

[0036] Preferably, the first wire unit 4 and the second wire unit 5 are distributed in the same direction, and extend along the grid lines 8 of the battery cell 9 and the gaps between adjacent battery cells 9 respectively, and their respective projections can be covered respectively, and the appearance shape can simultaneously refract the light 3 into the effective area of ​​the battery cell 9 to generate electricity.

[0037] Preferably, the wire mesh is made of metal or other high-strength materials, which can ensure that the glass has high strength and hardness and is not easily damaged or split.

[0038] Preferably, the silk screen is composed of a plurality of mutually parallel and perpendicular silk threads 2, and the number of the silk threads 2 corresponds to the gaps between the grid lines 8 of the battery cells 9 and the adjacent battery cells 9, so that the light 3 can just cover them when projected.

[0039] A method for preparing high-strength photovoltaic glass comprises the following steps:

[0040] S1. The raw materials for preparing the glass are mixed according to a certain weight ratio, transported to a mixing mixer, and uniformly stirred and mixed;

[0041] S2. Processing and melting: adding the mixed raw materials into the kiln and heating them at high temperature to form a uniform glass liquid without bubbles;

[0042] S3. Lay the metal mesh structure designed according to the component pattern flat in the middle of the furnace lip, and the glass liquid covers the metal mesh and flows out, and then cools and forms;

[0043] S4. Cut the formed glass.

[0044] Example 2

[0045] like Figure 4 As shown, the light trapping structure is a square shape of the wire 2. When the light 3 enters the glass vertically from top to bottom, the projection of the square wire 2 can just cover the grid line 8 of the cell 9 or the adjacent gap between adjacent cells 9.

[0046] Working principle: In the solution of the present invention, a metal mesh is added to the glass to enhance its overall structural strength. On the basis of its enhanced strength, the glass can be made thinner. The mesh is composed of a number of wires 2 corresponding to the gaps between the grid lines 8 of the battery cell 9 and the battery cells 9. After exposure to sunlight, the wires 2 are projected onto the gaps between the grid lines 8 of the battery cell 9 and the battery cells 9, without affecting the overall lighting of the battery cell 9 assembly. The wires 2 have a light-trapping structure, that is, the cross-section is triangular, and the side walls thereof can refract the light 3 incident on the glass. The light 3 can enter the effective power generation area of ​​the battery cell 9 after refraction for reuse, thereby greatly improving the utilization efficiency of the light 3.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0048] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A high-strength photovoltaic glass, characterized in that: The invention comprises a glass body (1) and a silk screen with a light trapping structure arranged in the glass body (1), wherein the silk screen is composed of a plurality of silk threads (2), and the silk threads (2) are located at the grid lines (8) of a cell (9) and / or the gaps between adjacent cell slices (9) after being projected into the glass body (1).

2. The high-strength photovoltaic glass according to claim 1, characterized in that: The light trapping structure is a triangular shape of the wire (2).

3. The high-strength photovoltaic glass according to claim 2, characterized in that: The glass body (1) comprises a front glass and a back glass, wherein the projection of the wires (2) in the front glass is located at the grid lines (8) on the cell sheets (9) and / or the gaps between adjacent cell sheets (9); wherein the bottom angle formed by the wires (2) projected at the gaps between adjacent cell sheets (9) and the horizontal plane of the glass is not less than 45°; and the bottom angle of the wires (2) in the back glass is not greater than 41.5°, and the projection of the wires (2) is located at the gaps between adjacent cell sheets (9).

4. The high-strength photovoltaic glass according to claim 1, characterized in that: The wire mesh inside the front glass is composed of a first wire unit (4) and / or a second wire unit (5), wherein the first wire unit (4) includes a plurality of equally spaced wires (2), wherein the width of the wire (2) is not greater than the width of a battery grid line (8) at a vertical projection position, and the height is not greater than the thickness of the glass body (1); and the second wire unit (5) is composed of a single wire (2), wherein the width of the wire (2) is not greater than the width of a gap between adjacent battery cells (9) at a vertical projection position, and the height is not greater than the thickness of the glass body (1).

5. The high-strength photovoltaic glass according to claim 4, characterized in that: The first wire unit (4) and the second wire unit (5) are distributed in the same direction and extend along the grid lines (8) of the battery cells (9) and the gaps between adjacent battery cells (9) respectively.

6. The high-strength photovoltaic glass according to claim 1, characterized in that: The wire mesh is made of metal or other high-strength materials.

7. The high-strength photovoltaic glass according to claim 1, characterized in that: The wire mesh is composed of a plurality of mutually parallel and perpendicular wires (2), and the number of the wires (2) corresponds to the grid lines (8) of the battery cells (9) and the gaps between adjacent battery cells (9).

8. A method for preparing the high-strength photovoltaic glass as claimed in claim 1, characterized in that: The following steps are involved: S1. The raw materials for preparing the glass are mixed according to a certain weight ratio, transported to a mixing mixer, and uniformly stirred and mixed; S2. Processing and melting: adding the mixed raw materials into the kiln and heating them at high temperature to form a uniform glass liquid without bubbles; S3. Lay the metal mesh structure designed according to the component pattern flat in the middle of the furnace lip, and the glass liquid covers the metal mesh and flows out, and then cools and forms; S4. Cut the formed glass.

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