Glazed photovoltaic glass and preparation method thereof

Abstract

The invention discloses glazed photovoltaic glass and a preparation method thereof, and relates to the technical field of photovoltaic modules. The glazed photovoltaic glass comprises a tempered glass substrate, wherein the tempered glass substrate comprises a glazed area and a non-glazed area; the glaze layer is arranged on the surface of the glaze plating area; the glaze layer comprises a plurality of glaze blocks, and a gap is formed between every two adjacent glaze blocks. According to the glazed photovoltaic glass provided by the invention, the glaze layer comprises the plurality of glaze blocks and the intervals exist between the adjacent glaze blocks, so that heat radiation heats the original glass sheet through the intervals between the glaze blocks in the tempering process, and all the glazed positions are uniformly heated; the problems of uneven heating and uneven tempering of a glaze-plated area and a non-glaze-plated area in the tempering process of the glaze-plated glass can be solved, and the overall strength of the glaze-plated photovoltaic glass is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic modules, and particularly to a glazed photovoltaic glass and a preparation method thereof. Background Art

[0002] In order to improve the light utilization rate of photovoltaic modules, a white glaze layer is provided in the area of the back glass of the photovoltaic module that is not covered by the solar cells, so as to reflect the light irradiated on the back glass to the front of the photovoltaic module. Currently, the glaze layer is generally in a long strip shape and completely covers the area of the back glass that is not covered by the solar cells. The width of the glaze layer is generally above 10 mm. Considering the reflectivity requirement, the thickness of the glaze layer cannot be lower than 15 μm, but since glazing will affect the strength of the glass, the thickness of the glaze layer is usually not higher than 25 μm.

[0003] Existing glazed strips have a large area and strong light reflection. Therefore, during the tempering process, when the tempering furnace radiates heat, due to the shielding and reflection of the glaze layer, the temperature of the glazed area and the non-glazed area (i.e., the area corresponding to the gap between the solar cells) is uneven, resulting in inconsistent tempering degrees of the glazed area and the non-glazed area during cooling. Research shows that the stress on the surface of the glass plate in the glazed area is about 40 MPa, while the stress in the non-glazed area can reach 100 MPa. The surface stress (tempering degree) at the glazing position is significantly less than that at the non-glazing position. Uneven tempering will cause the strength of the glazed area of the glass to be significantly lower than that of the non-glazed area, and the glazed glass is prone to bursting during use.

[0004] At the same time, due to the large glazing area (about 20% of the glass area), and each glazed strip is in a long strip shape and completely filled, the inconsistent expansion rates of the glaze and the glass and the bubbles and defects that are easily generated at the interface between the glaze and the glass during the sintering process of the glaze will affect the strength of the glass, and it is easy to cause the problem of breaking of the glazed glass. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art and provide a glazed photovoltaic glass and a preparation method thereof.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] On the one hand, an embodiment of the present invention provides a glazed photovoltaic glass, including: a tempered glass substrate, the tempered glass substrate includes a glazed area and a non-glazed area; and, a glaze layer provided on the surface of the glazed area; the glaze layer includes a plurality of glaze blocks and there is a gap between adjacent glaze blocks.

[0008] Optionally, the glaze blocks include a group of glaze blocks. The group of glaze blocks includes a plurality of central glaze blocks arranged along a first arrangement direction and a plurality of edge glaze blocks arranged along a second arrangement direction; the sizes of the plurality of edge glaze blocks gradually decrease in a direction away from the central glaze blocks; and the largest size among the edge glaze blocks is smaller than the size of the central glaze blocks.

[0009] Optionally, the first arrangement direction and the second arrangement direction are perpendicular, and the edge glaze blocks are symmetrically distributed on both sides of the central glaze blocks with the straight line passing through the centers of the plurality of central glaze blocks as the axis of symmetry.

[0010] Optionally, each central glaze block is correspondingly provided with an edge glaze block.

[0011] Optionally, edge glaze blocks are also provided between two adjacent central glaze blocks.

[0012] Optionally, the number of edge glaze blocks arranged on one side of each central glaze block is 4.

[0013] Optionally, both the central glaze blocks and the edge glaze blocks are circular. The diameter of the central glaze blocks is 1.8 - 2.2 mm, and the diameters of the 4 edge glaze blocks on one side of the central glaze block are 0.8 - 1.2 mm, 0.6 - 1.0 mm, 0.4 - 0.8 mm, and 0.2 - 0.6 mm in sequence.

[0014] Optionally, the diameter of the central glaze blocks is 2 mm, and the diameters of the 4 edge glaze blocks on one side of the central glaze block are 1 mm, 0.8 mm, 0.6 mm, and 0.4 mm in sequence.

[0015] Optionally, the glazed area includes a plurality of cell string gap areas arranged along a first distribution direction; in the cell string gap areas, the first arrangement direction is arranged along the first distribution direction.

[0016] Optionally, each cell string gap area is provided with a group of glaze blocks.

[0017] Optionally, the glazed area includes a plurality of cell gap areas arranged along a second distribution direction; the second distribution direction is perpendicular to the first distribution direction; in the cell gap areas, the first arrangement direction is arranged along the second distribution direction.

[0018] Optionally, each cell string gap area is provided with a group of glaze blocks.

[0019] Optionally, the glazed area includes an intermediate bus bar area located in the middle of the tempered glass substrate and arranged along the second distribution direction. In the intermediate bus bar area, the first arrangement direction is arranged along the second distribution direction.

[0020] Optionally, in the first distribution direction, the width of the intermediate bus bar area is greater than the width of the cell gap areas.

[0021] Optionally, in the middle bus bar region, two groups of glaze block groups are arranged in parallel in the first distribution direction.

[0022] Optionally, the glazed area includes first edge areas respectively arranged at two ends of the tempered glass substrate along the first direction, and the first edge areas are arranged along the second distribution direction; in the first edge areas, the first arrangement direction is arranged along the second distribution direction.

[0023] Optionally, in the first distribution direction, the width of the first edge region is greater than the width of the battery cell gap region.

[0024] Optionally, in the first edge region, two groups of glaze blocks are arranged in parallel in the first distribution direction.

[0025] Optionally, the glazed area includes second edge areas respectively arranged at two ends of the tempered glass substrate along the second direction, and the second edge areas are arranged along the first distribution direction; in the second edge areas, the first arrangement direction is arranged along the second distribution direction.

[0026] Optionally, in the second distribution direction, the width of the second edge region is greater than the width of the battery string gap region.

[0027] Optionally, in the second edge region, two groups of glaze blocks are arranged in parallel in the second distribution direction.

[0028] Optionally, the glaze layer has a thickness of 25 microns to 40 microns.

[0029] Optionally, the spacing between adjacent glaze blocks is no greater than 2.5 mm.

[0030] Optionally, the spacing between adjacent glaze blocks is 0.2 mm.

[0031] On the other hand, an embodiment of the present invention provides a method for preparing glazed photovoltaic glass, comprising:

[0032] a) Providing raw glass, the raw glass including glazed area and non-glazed area;

[0033] b) coating a plurality of block-shaped glazes on the glaze-plated area of ​​the original glass, with spaces between adjacent block-shaped glazes;

[0034] c) drying the original glass after coating with glaze;

[0035] d) Tempering the dried original glass.

[0036] Optionally, before step a), the method further includes: a glaze layout design step, wherein the glaze layout is designed according to the string spacing and the cell spacing of the component battery strings, and the glaze layout includes the size and layout of the glaze blocks.

[0037] Optionally, in step b), screen printing glaze is used, or first a screen template required for screen printing is made according to the glaze layout, and then the glaze is printed according to the screen template.

[0038] Optionally, in step b), white glaze is used, and / or the thickness of the glaze is 25 - 40 μm.

[0039] Optionally, the original sheet glass is rolled original sheet glass or float glass.

[0040] Optionally, in step a), pre - treatment of the original sheet glass is included, including but not limited to at least one of the steps of opening holes, edge grinding, and cleaning for pre - treating the original sheet glass.

[0041] Optionally, after step d), a testing step is further included to test the reflectivity and impact resistance strength of the glazed glass.

[0042] The positive and progressive effects of the present invention are as follows: In the glazed photovoltaic glass provided by the embodiments of the present invention, the glaze layer is set to include a plurality of glaze blocks and there are intervals between adjacent glaze blocks, so that during the tempering process, heat radiation heats the original sheet glass through the intervals between the glaze blocks, making all the glazed positions heated evenly, which can solve the problem of uneven heating and uneven tempering between the glazed area and the non - glazed area of the glazed glass during the tempering process, and improve the overall strength of the glazed photovoltaic glass.

[0043] In addition, due to the intervals between the glaze blocks, the amount of glaze can also be reduced, and the cost of the glazed photovoltaic glass can be lowered. Description of the Drawings

[0044] Figure 1 It is a flowchart of the preparation method of the glazed photovoltaic glass according to the preferred embodiment of the present invention.

[0045] Figure 2 It is a schematic diagram of the glazed photovoltaic glass according to the preferred embodiment of the present invention.

[0046] Figure 3 It is an enlarged schematic diagram of the glaze layer in the middle bus bar area according to the preferred embodiment of the present invention.

[0047] Figure 4 It is a partial enlarged schematic diagram of the battery string gap area according to the preferred embodiment of the present invention.

[0048] Figure 5 It is a partial enlarged schematic diagram of the grid formed in the battery string gap area and the cell gap area according to the preferred embodiment of the present invention.

[0049] Figure 6 It is a partial enlarged schematic diagram of the intersection of the grids in the battery string gap area and the cell gap area according to the preferred embodiment of the present invention.

[0050] Figure 7Schematic diagram of radiation heating during the toughening process of the preferred embodiment of the present invention.

[0051] Figure 8 Schematic diagram of the distribution of glaze blocks in a set of glaze block groups in the embodiment of the present invention.

[0052] Explanation of reference numerals:

[0053] Toughened glass substrate 1

[0054] Glaze layer 2

[0055] Glaze block 21

[0056] Middle glaze block 211

[0057] Edge glaze block 212

[0058] First edge glaze block 2121

[0059] Second edge glaze block 2122

[0060] Third edge glaze block 2123

[0061] Fourth edge glaze block 2124

[0062] Battery string gap area 22

[0063] Cell gap area 23

[0064] Thermal radiation ray 3

[0065] Original sheet glass 4

[0066] Middle bus bar area 5

[0067] First edge area 6

[0068] Second edge area 7 Detailed implementation manners

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0070] A photovoltaic module generally includes a front glass, a front encapsulation film, a battery string, a back encapsulation film, and a back glass. The front glass and the back glass are usually tempered glass and are rectangular in shape. A plurality of battery strings are generally included in the photovoltaic module, and there is a gap between adjacent battery strings, which is called the battery string gap. The adjacent solar cells in each battery string can have a positive pitch (i.e., there is a gap between adjacent solar cells, which is called the solar cell gap), a zero pitch, or even a negative pitch (i.e., the edges of adjacent solar cells overlap). There is also a gap (i.e., the edge area) between the battery string and the edge of the back glass. In addition, in the layout of some modules, a middle busbar area is provided in the middle position of the length direction of the back glass along the width direction for the extraction of the busbar and the installation of the junction box. It can be understood that the above-mentioned battery string gap area, solar cell gap area, edge area, and middle busbar area are usually rectangular.

[0071] In order to improve the light utilization rate of the photovoltaic module, a white glaze layer is provided in the area of the back glass not covered by the solar cells, so as to reflect the light irradiated on the back glass to the front of the photovoltaic module. The existing glazed photovoltaic glass has a glaze layer provided on the surface of the above-mentioned back glass facing the battery string and in all areas not covered by the battery string. However, such glazed photovoltaic glass is prone to bursting during use. The main reasons for this problem are as follows: 1) The glazed photovoltaic glass is prepared by first coating the glaze on the original glass and then tempering it. The existing glaze layer has a large area and strong light reflection. During the tempering process, when the tempering furnace radiates heat, due to the shielding and reflection of the glaze layer, the glazed area and the non-glazed area are heated unevenly, resulting in inconsistent tempering degrees of the glazed area and the non-glazed area during cooling, and the strength of the glazed area of the glass is significantly lower than that of the non-glazed area; 2) Due to the large glazed area and complete filling of the area not covered by the solar cells, the inconsistent expansion rates of the glaze and the glass and the bubbles and defects easily generated at the interface between the glaze and the glass during the sintering process of the glaze will both affect the glass strength.

[0072] Based on the above analysis, the embodiments of the present invention provide a glazed photovoltaic glass capable of preventing bursting during use and a preparation method thereof.

[0073] On the one hand, the embodiments of the present invention provide a glazed photovoltaic glass, as Figure 1 shown, the glazed photovoltaic glass includes: a tempered glass substrate 1, the tempered glass substrate 1 includes a glazed area and a non-glazed area; and, a glaze layer 2 provided on the surface of the glazed area. Among them, the glaze layer 2 includes a plurality of glaze blocks 21 and there is a gap between adjacent glaze blocks 21.

[0074] The tempered glass substrate 1 can be rectangular. It can be understood that when preparing a photovoltaic module, the surface of the glazed photovoltaic glass where the glaze layer 2 is provided faces the battery string. The unglazed area corresponds to the area covered by the battery cells, and the glazed area corresponds to the area not covered by the battery cells.

[0075] In the glazed photovoltaic glass provided by the embodiment of the present invention, the glaze layer 2 is arranged in a form where a plurality of glaze blocks 21 are arranged at intervals, that is, there are intervals between adjacent glaze blocks 21, and the glaze layer 2 does not completely cover the glazed area. During the glass tempering process, heat radiation heats the original sheet glass through the intervals between the glaze blocks 21, so that all the glazed positions are heated evenly, which can solve the problems of uneven heating and uneven tempering between the glazed area and the unglazed area during the tempering of the glazed glass, and can also solve the problems of defects and bubbles between the glaze layer 2 and the tempered glass substrate 1, improving the overall strength of the glazed photovoltaic glass. In addition, since there are intervals between the glaze blocks 21, the amount of glaze can also be reduced, reducing the cost of the glazed photovoltaic glass.

[0076] In the embodiment of the present invention, the thickness of the glaze layer 2 can be 25 micrometers to 40 micrometers, such as 26 micrometers, 28 micrometers, 30 micrometers, 32 micrometers, 34 micrometers, 35 micrometers, 36 micrometers, 38 micrometers, 40 micrometers, 42 micrometers, 44 micrometers, etc. In the prior art, the thickness of the glaze layer of the glazed photovoltaic glass is usually not higher than 25 micrometers, otherwise it will affect the strength of the glazed photovoltaic glass. However, in the embodiment of the present invention, since the interval arrangement of the glaze blocks 21 can improve the glass strength, the thickness of the glaze layer 2 can be increased to improve the reflection effect on the premise of ensuring the glass strength. In addition, the content of glass powder in the glaze formula can also be increased to improve the reflectivity and wear resistance, bringing power gain.

[0077] The distance between adjacent glaze blocks 21 can be determined according to the thermal simulation results of the glaze block shape and can be less than 2.5 millimeters, such as 2 millimeters, 1.8 millimeters, 1.6 millimeters, 1.5 millimeters, 1.4 millimeters, 1.2 millimeters, 1.0 millimeters, 0.8 millimeters, 0.6 millimeters, 0.5 millimeters, 0.4 millimeters, 0.2 millimeters, 0.1 millimeters, etc.

[0078] As an alternative embodiment of the embodiment of the present invention, the glaze block 21 includes a glaze block group. Figure 8 Shows the arrangement of the glaze blocks in a group of glaze block groups, see Figure 8 , the glaze block group includes a plurality of central glaze blocks 211 arranged along a first arrangement direction (such as Figure 8 the left - right direction in Figure 8A plurality of edge enamel blocks 212 arranged in the vertical direction (in the figure). The sizes of the plurality of edge enamel blocks 212 gradually decrease in the direction away from the central enamel block 212; and the largest size among the edge enamel blocks 212 is smaller than the size of the central enamel block. The arrangement of the plurality of central enamel blocks 211 in the first arrangement direction can be understood as that the centers of the plurality of central enamel blocks 211 are arranged along a straight line extending in the first arrangement direction.

[0079] Through the above-mentioned gradient design, the heat and stress received by the enamel-coated photovoltaic glass during production and use can be gradually transferred, which can further solve the problem of uneven heat distribution in the glass during the toughening process. At the same time, when the enamel-coated glass is unevenly heated and stressed during use, the enamel blocks 21 with gradient sizes can gradually conduct the heat and stress, solving the problem that the enamel-coated photovoltaic glass is prone to breakage.

[0080] In the embodiment of the present invention, the first arrangement direction and the second arrangement direction can be perpendicular. With the straight line where the centers of the plurality of central enamel blocks 211 are located as the axis of symmetry, edge enamel blocks 212 are symmetrically distributed on both sides of the central enamel blocks 211.

[0081] Edge enamel blocks 212 can be correspondingly arranged on both sides of each central enamel block 211. As Figure 8 shown, the center of each central enamel block 211 and the centers of the edge enamel blocks 212 on both sides thereof are arranged on the same straight line extending in the second arrangement direction.

[0082] Edge enamel blocks 212 can also be arranged between two adjacent central enamel blocks 211. Refer to Figure 8 , edge enamel blocks 212 are respectively arranged on both sides of the above-mentioned axis of symmetry between every two adjacent central enamel blocks 211, and the centers of the edge enamel blocks 212 on both sides of the axis of symmetry are also arranged on the same straight line extending in the second arrangement direction.

[0083] The number of edge enamel blocks 212 arranged on one side of each central enamel block 211 is 4. Refer to Figure 8 , 4 edge enamel blocks 212 are respectively arranged on both sides of each central enamel block 211, and 4 edge enamel blocks 212 are respectively arranged on both sides of the above-mentioned axis of symmetry between every two adjacent central enamel blocks 211. The above-mentioned 4 edge enamel blocks 212 are successively the first edge enamel block 2121, the second edge enamel block 2122, the third edge enamel block 2123, and the fourth edge enamel block 2124 in the order from near to far from the central enamel block 211.

[0084] As an alternative embodiment, both the central enamel block 211 and the edge enamel block 212 are circular. The circular enamel blocks 21 contribute to achieving a more uniform heat distribution during the toughening process because the distance from the circular edge to the center is consistent, which helps to reduce the concentration of thermal stress.

[0085] The diameter of the central glaze block 211 can be 1.8 - 2.2 mm (such as 1.9 mm, 2.0 mm, 2.1 mm, etc.), the diameter of the first edge glaze block 2121 can be 0.8 - 1.2 mm (such as 0.9 mm, 1.0 mm, 1.1 mm, etc.), the diameter of the second edge glaze block 2122 can be 0.6 - 1.0 mm (such as 0.7 mm, 0.8 mm, 0.9 mm, etc.), the diameter of the third edge glaze block 2123 can be 0.4 - 0.8 mm (such as 0.5 mm, 0.6 mm, 0.7 mm, etc.), 0.2 - 0.6 mm (such as 0.2 mm, 0.4 mm, 0.5 mm, etc.).

[0086] It can be understood that the diameters of the central glaze block 211, the first edge glaze block 2121, the second edge glaze block 2122, the third edge glaze block 2123, and the fourth edge glaze block 2124 are within the above ranges and decrease in sequence. Optionally, the diameters of the central glaze block 211, the first edge glaze block 2121, the second edge glaze block 2122, the third edge glaze block 2123, and the fourth edge glaze block 2124 are 2 mm, 1 mm, 0.8 mm, 0.6 mm, and 0.4 mm in sequence. With the glaze blocks 21 of the above diameters, the spacing between adjacent glaze blocks 21 can be 0.2 mm.

[0087] The structure of the glaze block group is explained above. Next, the specific setting method of the glaze block group in the glazing area will be further described.

[0088] See Figure 2 、 Figure 3 and Figure 4 , the glazing area includes a plurality of cell string gap areas 22 arranged along the first distribution direction, that is, corresponding to the gaps between cell strings in the photovoltaic module. The first distribution direction is the left - right direction (X - direction) in Figure 2 , and is usually the length direction of the tempered glass substrate 1. The cell string gap area 22 is rectangular, and its length direction is arranged along the first distribution direction. In the cell string gap area 22, the first arrangement direction is arranged along the first distribution direction. It can be understood that a plurality of central glaze blocks 211 are arranged along the first distribution direction, or it can be understood that the centers of a plurality of central glaze blocks 211 are set on a straight line extending along the first distribution direction. A group of glaze block groups can be set in each cell string gap area 22.

[0089] For the component version where there are also gaps between adjacent cells in the cell string, the glazing area further includes a plurality of cell gap areas 23 arranged along the second distribution direction, that is, corresponding to the gaps between cells in the photovoltaic module. The second distribution direction is perpendicular to the first distribution direction and is Figure 2In the up-down direction (Y direction), it can usually be the width direction of the tempered glass substrate 1. The battery string gap region 23 is rectangular, and its length direction is set along the second distribution direction. In the battery cell gap region 23, the first arrangement direction is set along the second distribution direction. It can be understood that multiple central glaze blocks 211 are arranged along the second distribution direction, or it can be understood that the centers of multiple central glaze blocks 211 are set on a straight line extending along the second distribution direction. A set of glaze block groups can be set in each battery cell gap region 23.

[0090] As Figure 5 and Figure 6 shown, there is an overlapping region between the above-mentioned battery string gap region 22 and the battery cell gap region 23. In the overlapping region, the arrangement of the edge glaze blocks 22 can be appropriately adjusted to make the glaze block distribution more uniform. For example, multiple edge glaze blocks at the intersection position can be arranged along an arc.

[0091] Furthermore, the glazed area also includes an intermediate bus bar region 5 located in the middle of the tempered glass substrate 1 and set along the second distribution direction. In the intermediate bus bar region 5, the first arrangement direction is set along the second distribution direction. The intermediate bus bar region 5 is rectangular, located at the middle part of the length direction of the tempered glass substrate 1, and its length direction is set along the second distribution direction (i.e., the width direction of the tempered glass substrate 1). It can be understood that the intermediate bus bar region 5 and the battery cell gap region 23 are parallel. As Figure 3 shown, in the first distribution direction, the width of the intermediate bus bar region 5 can be greater than the width of the battery cell gap region 23. In the intermediate bus bar region, two sets of glaze block groups can be arranged in parallel in the first distribution direction, that is, the centers of the central glaze blocks 21 of the two sets of glaze block groups are parallel to each other.

[0092] Furthermore, the glazed area also includes first edge regions 6 respectively arranged at both ends of the tempered glass substrate along the first direction (i.e., both ends of the length direction). The first edge regions 6 are set along the second distribution direction. The first edge regions 6 are rectangular, and their length directions are set along the second distribution direction (i.e., the width direction of the tempered glass substrate 1 is set). It can be understood that the first edge regions 6 and the intermediate bus bar region 5 as well as the battery cell gap region 23 are parallel. In the first edge regions 6, the first arrangement direction is set along the second distribution direction. In the first distribution direction, the width of the first edge regions 6 can be greater than the width of the battery cell gap region 23; in the first edge regions 6, two sets or more sets of glaze block groups can be arranged in parallel in the first distribution direction, that is, the center lines of the central glaze blocks 21 of the two sets or more sets of glaze block groups are parallel to each other and arranged along the first distribution direction.

[0093] Furthermore, the glazed area also includes a second edge area 7 respectively arranged at both ends of the tempered glass substrate along the second direction (i.e., both ends in the width direction). The second edge area 7 is arranged along the first distribution direction, and the second edge area 7 is rectangular, and its length direction is arranged along the first distribution direction (i.e., the length direction of the tempered glass substrate 1). In the second edge area 7, the first arrangement direction is arranged along the second distribution direction. That is, the second edge area 7 is parallel to the battery string gap area 22. In the second distribution direction, the width of the second edge area 7 can be greater than the width of the battery string gap area. In the second edge area 7, in the second distribution direction, two or more groups of glaze block groups can be arranged in parallel, that is, the center lines of the central glaze blocks 21 of the two or more groups of glaze block groups are parallel to each other and arranged along the second distribution direction.

[0094] Through experimental tests, the glazed photovoltaic glass provided by the embodiment of the present invention has a tempering degree difference between the glazed area and the non-glazed area within 13Mpa, which is in line with the test results of conventional semi-tempered glass. There is no obvious difference in impact resistance between the glazed area and the non-glazed area. The impact resistance test results of the intersection positions such as the intersection of the battery string gap area and the battery cell gap area have not shown a significant decrease, but the reflectivity has a slight decrease of 51-73%. The main reason is that there are gaps in the glaze designed in this scheme, and some light will pass through the gaps, so the reflectivity will be reduced. At the same time, due to the changes in the gap area at different test points, the test results fluctuate from 51% to 73%. At the same time, due to the increase in the thickness of the glaze, the reflectivity of the glazed area increases, so the reflectivity test results of some positions with less gaps are higher.

[0095] On the other hand, an embodiment of the present invention provides a method for preparing the above photovoltaic glazed glass, which mainly includes a glazing step, a drying step, and a tempering step, such as Figure 1 As shown, specifically including:

[0096] Step 101, providing an original glass sheet, wherein the original glass sheet includes a glazed area and a non-glazed area;

[0097] Step 102, coating the glaze-plated area of ​​the original glass with a plurality of block-shaped glazes, with spaces between adjacent block-shaped glazes;

[0098] Step 103, drying the original glass after coating the glaze;

[0099] Step 104, after drying is completed, the original glass is tempered.

[0100] In the preparation method provided by the embodiments of the present invention, bulk glaze is coated on the original sheet glass, and there are gaps between adjacent bulk glazes. After drying and tempering steps, the original sheet glass becomes a tempered glass substrate, and the bulk glaze becomes glaze blocks, obtaining glazed photovoltaic glass. As described above, for the glazed photovoltaic glass obtained by using this preparation method, there are intervals between adjacent glaze blocks 21 in the glaze layer, and the glaze layer 2 does not completely cover the glazed area, enabling heat radiation to heat the original sheet glass through the intervals between the glaze blocks 21 during the glass tempering process, making all glazed positions evenly heated, capable of solving the problems of uneven heating and uneven tempering between the glazed area and the non-glazed area of the glazed glass during the tempering process, and also capable of solving the problems of defects and bubbles between the glaze layer 2 and the tempered glass substrate 1, enhancing the overall strength of the glazed photovoltaic glass. Additionally, due to the existence of intervals between the glaze blocks 21, the amount of glaze used can be reduced, and the cost of the glazed photovoltaic glass can be lowered.

[0101] In the embodiments of the present invention, the original sheet glass can be a rolled original sheet glass or a float glass. For example, a rolled original sheet glass with dimensions of 1716*1128*1.6 mm can be used. In step 101, it can include preprocessing the original sheet glass, including but not limited to preprocessing the original sheet glass by at least one of opening holes, grinding edges, and cleaning.

[0102] In the embodiments of the present invention, before step 101, it can also include: a glazed layout design step, designing the glazed layout according to the component layout, including but not limited to the string spacing and cell spacing of the battery string. The glazed layout includes the size and layout of the glaze blocks.

[0103] In the embodiments of the present invention, in step 102, screen printing can be used for glazing. First, a screen printing template required for screen printing can be made according to the glazed layout, and then the glaze is printed according to the screen printing template. By using the method of screen printing to coat the glaze, the distribution and shape of the glaze can be precisely controlled, ensuring that the size and intervals of the glaze blocks 21 meet the design requirements and reducing unnecessary waste. And, in step 102, white glaze can be used, and the thickness of the glaze coating can be 25 - 40 microns.

[0104] In the embodiments of the present invention, the drying step of step 103 can be carried out by drying in an oven or other means. In the tempering step of step 104, the original sheet glass 4 can be sent into a tempering furnace for tempering by means of heat radiation heating. As Figure 7 shown, during the tempering process, the heat radiation rays 3 heat the original sheet glass 4 through the intervals between the glaze blocks 21.

[0105] In the embodiments of the present invention, after step 104, it can also include a testing step, testing the reflectivity and impact resistance of the glazed glass.

[0106] In summary, for the glazed photovoltaic glass provided by the embodiments of the present invention, the glaze layer in the glazed area is arranged in the form of spaced glaze blocks, which can significantly reduce the difference in tempering degree and stress between the glazed area and the non-glazed area of the glass itself and make it tend to be uniform. There are no problems of bubbles and defects at the interface between the glaze layer and the tempered glass substrate. The glazed photovoltaic glass will not have a strength reduction caused by the mismatch between the expansion rates of the glaze and the glass. Moreover, the thickness of the glaze layer of the glazed photovoltaic glass can exceed 25 microns, thereby improving the light reflectivity. And compared with the existing glazed photovoltaic glass, no new equipment needs to be introduced to produce the glazed photovoltaic glass of the embodiments of the present invention, and the existing production line equipment can be used.

Claims

1. A glazed photovoltaic glass, characterized in that, Comprising: A toughened glass substrate, the toughened glass substrate including an enameled area and a non-enameled area; And, An enamel layer disposed on the surface of the enameled area; The enamel layer includes a plurality of enamel blocks and there are intervals between adjacent enamel blocks.

2. The enameled photovoltaic glass according to claim 1, characterized in that The enamel block includes an enamel block group, the enamel block group includes a plurality of central enamel blocks arranged along a first arrangement direction, and a plurality of edge enamel blocks arranged along a second arrangement direction; the sizes of the plurality of edge enamel blocks decrease in sequence along the direction away from the central enamel block; and the largest size among the edge enamel blocks is smaller than the size of the central enamel block.

3. The glazed photovoltaic glass according to claim 2, wherein The first arrangement direction and the second arrangement direction are perpendicular, and with the straight line where the centers of the plurality of central enamel blocks are located as the axis of symmetry, the edge enamel blocks are symmetrically distributed on both sides of the central enamel block; Preferably, each central enamel block is correspondingly provided with an edge enamel block; Preferably, there is also an edge enamel block arranged between two adjacent central enamel blocks; Preferably, the number of edge enamel blocks arranged on one side of each central enamel block is 4; Preferably, both the central enamel block and the edge enamel blocks are circular, the diameter of the central enamel block is 1.8 - 2.2 mm, and the diameters of the 4 edge enamel blocks on one side of the central enamel block are 0.8 - 1.2 mm, 0.6 - 1.0 mm, 0.4 - 0.8 mm, 0.2 - 0.6 mm in sequence; Preferably, the diameter of the central enamel block is 2 mm, and the diameters of the 4 edge enamel blocks on one side of the central enamel block are 1 mm, 0.8 mm, 0.6 mm, 0.4 mm in sequence.

4. The glazed photovoltaic glass according to claim 2 or 3, characterized in that, The enameled area includes a plurality of cell string gap areas arranged along a first distribution direction; in the cell string gap area, the first arrangement direction is arranged along the first distribution direction; Preferably, each cell string gap area is provided with a group of the enamel block group.

5. The glazed photovoltaic region according to claim 4, wherein, The enameled area includes a plurality of cell piece gap areas arranged along a second distribution direction; the second distribution direction is perpendicular to the first distribution direction; in the cell piece gap area, the first arrangement direction is arranged along the second distribution direction; Preferably, each cell string gap area is provided with a group of the enamel block group.

6. The glazed photovoltaic glass according to claim 5, characterized in that, The enameled area includes an intermediate bus bar area located in the middle of the toughened glass substrate and arranged along the second distribution direction, in the intermediate bus bar area, the first arrangement direction is arranged along the second distribution direction; Preferably, in the first distribution direction, the width of the intermediate bus bar area is greater than the width of the cell piece gap area; Preferably, in the intermediate bus bar area, two groups of the enamel block group are arranged in parallel in the first distribution direction.

7. The glazed photovoltaic glass according to claim 5, characterized in that The enameled area includes first edge areas respectively arranged at both ends of the toughened glass substrate along a first direction, the first edge areas are arranged along the second distribution direction; in the first edge area, the first arrangement direction is arranged along the second distribution direction; Preferably, in the first distribution direction, the width of the first edge area is greater than the width of the cell piece gap area; Preferably, in the first edge region, two groups of glaze block groups are arranged in parallel in the first distribution direction.

8. The glazed photovoltaic glass according to claim 5, wherein, The glaze coating area includes second edge areas respectively arranged at two ends of the tempered glass substrate along the second direction, the second edge areas are arranged along the first distribution direction; in the second edge areas, the first arrangement direction is arranged along the second distribution direction; Preferably, in the second distribution direction, the width of the second edge region is greater than the width of the battery string gap region; Preferably, in the second edge region, two groups of glaze block groups are arranged in parallel in the second distribution direction.

9. The glazed photovoltaic glass according to claim 1, characterized in that, The thickness of the glaze layer is 25 microns to 40 microns; and / or, the spacing between adjacent glaze blocks is no greater than 2.5 mm; And / or, the spacing between adjacent glaze blocks is 0.2 mm.

10. A method for preparing glazed photovoltaic glass, characterized in that, include: a) providing an original glass, wherein the original glass comprises a glazed area and a non-glazed area; b) coating a plurality of block-shaped glazes on the glaze-plated area of ​​the original glass, with spaces between adjacent block-shaped glazes; c) drying the original glass after being coated with the glaze; d) tempering the dried original glass.

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