Glaze plating method for photovoltaic glass and glazed photovoltaic glass

Abstract

The invention discloses a glaze plating method of photovoltaic glass and glazed photovoltaic glass. The glaze plating method comprises a first surface glaze plating step, a second surface glaze plating step and a tempering step. In the first surface glaze plating step, glaze plating is carried out on the first surface of the pretreated raw glass sheet at intervals; in the second surface glaze plating step, glaze is plated on the second surface of the original glass sheet at intervals to obtain double-surface glaze-plated glass, and the second surface is the surface opposite to the first surface. In the tempering step, the double-sided glazed glass is tempered. According to the glaze plating method disclosed by the invention, the glaze plating area on the surface of the photovoltaic glass can be reduced, and the problems of uneven tempering degree and stress of a glaze plating area and a blank area caused by light shielding and reflection due to glaze plating are solved. And the problem that bubbles and flaws are caused at the interface of the glaze and the glass due to an existing glaze plating mode is also solved. And the problem of strength reduction caused by mismatching of the glaze and the glass expansion rate due to large-area continuous single-side glaze plating is also solved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaics, and in particular to a photovoltaic glass glazing method and glazed photovoltaic glass. Background Art

[0002] At present, the photovoltaic glass glazing commonly used is generally glazed on the back glass according to the layout, at the gap between the cells. It is generally a long, fully filled porcelain white or porcelain black strip. The glazing width is generally more than 10mm, and the middle, surrounding and middle busbar areas are wider. Considering the reflectivity requirements, the glazing thickness cannot be less than 15μm, but because glazing will affect the strength of the glass, the glazing thickness cannot be higher than 25μm.

[0003] The existing glazed strips have a large area and strong light reflection. Therefore, during the tempering process, when the tempering furnace radiates heating, the glazed area and the blank area have uneven temperatures due to the obstruction and reflection of the glaze layer, resulting in inconsistent tempering degrees between the glazed area and the blank area during cooling. Studies have shown that the stress on the glass plate surface in the glazed area is about 40MPa, while the stress in the non-glazed area can reach 100MPa. The surface stress (tempering degree) at the glazed position is significantly smaller than that at the blank position. Uneven tempering will cause the strength of the glazed glass to be significantly lower than that of the non-glazed glass. During use, the glazed glass is prone to back glass explosion.

[0004] At the same time, since the glaze coating area is large (accounting for about 20% of the glass area) and each glaze coating strip is long and fully 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 will affect the strength of the glass and easily cause the glazed glass to break. 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 photovoltaic glass glazing method and glazed photovoltaic glass.

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

[0007] A method for glazing photovoltaic glass, comprising:

[0008] A first side glazing step of glazing the first side of the pre-treated original glass;

[0009] a second-side glazing step of coating the second side of the original glass with glaze to obtain double-sided glazed glass, wherein the second side is opposite to the first side;

[0010] The tempering step is to temper the double-sided glazed glass.

[0011] Preferably,

[0012] In the first-side glazing step, a plurality of first glaze layers spaced along a first distribution direction or a second distribution direction are coated on the first side of the original glass, with interval areas formed between adjacent first glaze layers;

[0013] In the second-side glazing step, a plurality of second glaze layers spaced apart along the first distribution direction or the second distribution direction are coated on the second side of the original glass, and the second glaze layers are arranged opposite to the spaced areas.

[0014] Preferably, the length of the second glaze layer in the first distribution direction or the second distribution direction is greater than the length of the spacing area in the first distribution direction or the second distribution direction.

[0015] Preferably, in the first surface glazing step, the glaze layer thickness is increased and the glass powder content is increased;

[0016] And / or, in the second-side glazing step, the thickness of the glaze layer is increased and the content of the glass powder is increased.

[0017] Preferably, before the first surface glazing step, a pretreatment step is further included, including but not limited to pretreatment of the original glass by at least one of opening, edge grinding and cleaning;

[0018] And / or, a testing step is further included after the tempering step to test the reflectivity and impact resistance of the tempered double-sided enameled glass.

[0019] A glazed photovoltaic glass is prepared using the above-mentioned photovoltaic glass glazing method, and the glazed photovoltaic glass comprises:

[0020] Original glass;

[0021] A plurality of first glaze layers are arranged on the first surface of the original glass at intervals along the first distribution direction or the second distribution direction;

[0022] A plurality of second glaze layers are arranged at intervals on the second surface of the original glass along the first distribution direction or the second distribution direction.

[0023] Preferably, there is a spacing area between adjacent first glaze layers, and the second glaze layer is arranged opposite to the spacing area.

[0024] Preferably, the length of the second glaze layer in the first distribution direction is greater than the length of the spacing area in the first distribution direction, and the length of the second glaze layer in the second distribution direction is greater than the length of the spacing area in the second distribution direction.

[0025] Preferably, the original glass is rolled glass or float glass, and the first surface is the embossed surface of the rolled glass or the non-tin surface of the float glass.

[0026] Preferably, the length of the spacing area in the first distribution direction or the second distribution direction is B;

[0027] The length of the second glaze layer in the first distribution direction or the second distribution direction is L;

[0028] The overlapping length of one side of the second glaze layer and the first glaze layer adjacent to the side in the first distribution direction or the second distribution direction is △L;

[0029] The angle between the incident solar ray and the surface of the glazed photovoltaic glass is α;

[0030] The thickness of the glazed photovoltaic glass is T;

[0031] Then ΔL=(LB) / 2=T / tanα. Based on the common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily to obtain the preferred embodiments of the present invention.

[0032] The positive and progressive effect of the present invention is that the glazing method of the present invention includes a first-side glazing step, a second-side glazing step and a tempering step. The first-side glazing step refers to intermittent glazing on the first side of the pretreated original glass. The second-side glazing step refers to intermittent glazing on the second side of the original glass to obtain double-sided glazed glass, wherein the second side is the side opposite to the first side. The tempering step refers to tempering the double-sided glazed glass. The glazing method of the present invention reduces the area of ​​a single glazed area by intermittent glazing on the surface of photovoltaic glass, thereby solving the problem of significant difference in tempering degree and stress between the glazed area and the blank area caused by light blocking and reflection caused by large-area continuous single-sided glazing, and also solves the problem of bubbles and defects caused at the interface between the glaze and the glass caused by the existing large-area continuous single-sided glazing method, and also solves the problem of strength reduction caused by the mismatch between the expansion rate of the glaze and the glass amplified by large-area continuous single-sided glazing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a flow chart of a photovoltaic glass glazing method according to a preferred embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of glazed photovoltaic glass according to a preferred embodiment of the present invention.

[0035] Figure 3 This is a partially enlarged schematic diagram of the first-side glazing of a preferred embodiment of the present invention.

[0036] Figure 4 This is a partially enlarged schematic diagram of the second-side glazing of a preferred embodiment of the present invention.

[0037] Figure 5 This is a partially enlarged schematic diagram of the first and second surface glazed finished products of the preferred embodiment of the present invention.

[0038] Figure 6 This is a schematic cross-sectional view of the first and second surfaces after glazing in a preferred embodiment of the present invention.

[0039] Figure 7 This is a schematic diagram of radiation heating during the tempering process in a preferred embodiment of the present invention.

[0040] Figure 8 This is a schematic diagram of incident light from the back side of a component manufactured according to a preferred embodiment of the present invention.

[0041] Description of reference numerals:

[0042] Glaze area 1

[0043] Blank Area 2

[0044] First glaze layer 3

[0045] Original glass 4

[0046] Second glaze layer 5

[0047] Thermal radiation ray 6

[0048] Back incident light 7 DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that in the claims and description of this patent, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0051] like Figure 1As shown, this embodiment discloses a glazing method for photovoltaic glass, which includes a first-side glazing step, a second-side glazing step and a tempering step.

[0052] The first-side glazing step refers to coating the first side of the pre-treated original glass 4 with glaze.

[0053] The second side glazing step refers to glazing the second side of the original glass 4 to obtain double-sided glazed glass, where the second side is the side opposite to the first side. In order to make it easier to glaze the second side, the glass that has been glazed on the first side can be turned over.

[0054] The tempering step refers to tempering the double-sided enameled glass. Specifically, after the double-sided enameled glass is turned over, it is sent into a tempering furnace for tempering.

[0055] In this embodiment, the above-mentioned glazing method is used to reduce the area of ​​a single glazed area on the surface of the photovoltaic glass, thereby solving the problem of significant differences in toughening degree and stress between the glazed area 1 and the blank area 2 caused by light blocking and reflection due to large-area continuous single-sided glazing, and also solving the problem of bubbles and defects at the interface between the glaze and the glass caused by large-area continuous single-sided glazing. It also solves the problem of strength loss caused by the mismatch between the expansion rates of the glaze and the glass due to large-area continuous single-sided glazing.

[0056] More specifically, in the first side glazing step, a plurality of glazes are coated on the first side of the original glass 4 along the first distribution direction or the second distribution direction ( Figure 2 The X direction shown in the figure is the first distribution direction, and the Y direction is the second distribution direction) and the first glaze layers 3 are arranged at intervals, and the interval area is between adjacent first glaze layers 3. In the second-side glazing step, a plurality of second glaze layers 5 arranged at intervals along the first distribution direction or the second distribution direction are plated on the second side of the original glass 4, and the second glaze layers 5 are arranged opposite to the interval area.

[0057] In this embodiment, by adopting the method of double-sided staggered gap glazing with the first glaze layer 3 and the second glaze layer 5 as an interval, during the heating process entering the tempering furnace, the thermal radiation light 6 heats the original glass 4 through the gap of the first glaze layer 3, and at the same time is reflected by the second glaze layer 5 to the position blocked by the first glaze layer 3, which can significantly reduce the temperature difference between the glazed area 1 and the blank area 2 caused by light blocking and reflection due to large-area continuous single-sided glazing, thereby greatly improving the uniformity of the tempering degree and stress of the glazed area 1 and the blank area 2.

[0058] Furthermore, in this embodiment, the length of the second glaze layer 5 in the first distribution direction is greater than the length of the spacing area in the first distribution direction, and the length of the second glaze layer 5 in the second distribution direction is greater than the length of the spacing area in the second distribution direction, so that when the heat radiation heats the original glass 4 through the spacing of the first glaze layer 3, it can be more fully reflected by the second glaze layer 5 to the position blocked by the first glaze layer 3, thereby further reducing the temperature difference between the glazed area 1 and the blank area 2, which is more conducive to improving the uniformity of the toughening degree and stress of the glazed area 1 and the blank area 2.

[0059] The shapes of the first glaze layer 3 and the second glaze layer 5 can be rectangular, diamond or other shapes, and the colors can be changed according to needs or material properties.

[0060] The glazing method of photovoltaic glass of this embodiment also solves the problem that the existing glaze exceeding 25 μm may affect the strength of the glass, and the glazing thickness can be made higher than 25 μm. Therefore, in the first-side glazing step and / or in the second-side glazing step, the glaze layer thickness and the glass powder content in the formula can be increased to improve the reflectivity and wear resistance, thereby bringing power gain.

[0061] In this embodiment, due to the use of interval glazing, after the incident light 7 from the back is irradiated onto the first glaze layer 3 through the second surface interval, it is not reflected out as in conventional glazing, but is reflected onto the second glaze layer 5 and then reflected into the interior of the glass, thus bringing about power gain.

[0062] Furthermore, in this embodiment, a pretreatment step is also included before the first side glazing step, in which the original glass 4 is pretreated, and the pretreatment includes opening holes, edge grinding and cleaning, etc., to facilitate glazing and improve the quality of glazing. More specifically, a rolled glass with a size of 1716*1128*1.6 mm is used, the glazing pattern uses the existing conventional glazing pattern, the glazing selects white glaze, and the glazing width is the same as the pattern. Figure 1 The glaze thickness is 15-40μm.

[0063] In addition, after the tempering step, a testing step is also included to test the reflectivity and impact resistance of the tempered double-sided glazed glass to ensure that there are no quality issues.

[0064] like Figure 2-Figure 8 As shown, this embodiment also discloses a glazed photovoltaic glass, which is prepared using the above-mentioned photovoltaic glass glazing method. The glazed photovoltaic glass includes an original glass 4, multiple first glaze layers 3 and multiple second glaze layers 5.

[0065] A plurality of first glaze layers 3 are arranged at intervals on the first surface of the original glass 4 along the first distribution direction or the second distribution direction, and a plurality of second glaze layers 5 are arranged at intervals on the second surface of the original glass 4 along the first distribution direction or the second distribution direction.

[0066] The glazed photovoltaic glass of this embodiment adopts the above-mentioned structural form. During production and preparation, the tempering degree and stress difference between the glazed area 1 and the blank area 2 can be significantly reduced to make them uniform. There are no bubbles and defects at the interface between the glaze and the glass of the glazed photovoltaic glass. The glazed photovoltaic glass will not suffer a decrease in strength due to the mismatch between the expansion rates of the glaze and the glass. The thickness of the glaze layer of the glazed photovoltaic glass can exceed 25μm.

[0067] Furthermore, in this embodiment, there is a spacing area between adjacent first glaze layers 3, and the second glaze layer 5 is arranged opposite to the spacing area.

[0068] The glazed photovoltaic glass of this embodiment adopts the above-mentioned structural form. During production and preparation, when thermal radiation heats the original glass 4 through the gap of the first glaze layer 3, it can be more fully reflected to the position blocked by the first glaze layer 3 through the second glaze layer 5, thereby significantly reducing the temperature difference between the glazed area 1 and the blank area 2 caused by light blocking and reflection due to large-area continuous single-sided glazing, thereby greatly improving the uniformity of toughening degree and stress between the glazed area 1 and the blank area 2.

[0069] Furthermore, the length of the second glaze layer 5 in the first distribution direction is greater than the length of the spacing area in the first distribution direction, and the length of the second glaze layer 5 in the second distribution direction is greater than the length of the spacing area in the second distribution direction.

[0070] The glazed photovoltaic glass of this embodiment adopts the above-mentioned structural form. During production and preparation, when the thermal radiation heats the original glass 4 through the gap of the first glaze layer 3, it can be more fully reflected by the second glaze layer 5 to the position blocked by the first glaze layer 3, thereby further reducing the temperature difference between the glazed area 1 and the blank area 2, which is more conducive to improving the uniformity of the toughening degree and stress of the glazed area 1 and the blank area 2.

[0071] Furthermore, in this embodiment, the original glass 4 is made of rolled glass or float glass, and the first surface is the embossed surface of the rolled glass or the non-tin surface of the float glass.

[0072] Further, in this embodiment, the length of the spacing area in the first distribution direction or the second distribution direction is B.

[0073] The length of the second glaze layer 5 in the first distribution direction or the second distribution direction is L.

[0074] An overlapping length of one side of the second glaze layer 5 and the first glaze layer 3 adjacent to the side in the first distribution direction or the second distribution direction is ΔL.

[0075] The angle between the incident sun light and the surface of the glazed photovoltaic glass is α.

[0076] The thickness of the enameled photovoltaic glass is T.

[0077] Then △L=(LB) / 2=T / tanα.

[0078] Preferably, the size calculation method of the first and second glaze layers can be changed according to the angle, but the effect of interval glazing should still be limited.

[0079] After testing, the glazed photovoltaic glass of this embodiment obtained by using the new glazing method in this patent has a tempering degree difference of less than 10MPa between the glazed area 1 and the blank area 2, which is consistent with the test results of conventional semi-tempered glass, and the four-point bending strength is consistent with the test results of the same batch of non-glazed back glass. There is no difference in impact resistance between the glazed area 1 and the blank area 2 (the breaking height is all above 100cm), the reflectivity is about 78%, which is significantly improved, and the test results are uniform and without abnormalities.

Claims

1. A method for coating glaze on photovoltaic glass, characterized in that: include: A first side glazing step of glazing the first side of the pre-treated original glass; a second-side glazing step of coating the second side of the original glass with glaze to obtain double-sided glazed glass, wherein the second side is opposite to the first side; The tempering step is to temper the double-sided glazed glass.

2. The method for coating glaze on photovoltaic glass according to claim 1, characterized in that: In the first-side glazing step, a plurality of first glaze layers spaced along a first distribution direction or a second distribution direction are coated on the first side of the original glass, with interval areas formed between adjacent first glaze layers; In the second-side glazing step, a plurality of second glaze layers spaced apart along the first distribution direction or the second distribution direction are coated on the second side of the original glass, and the second glaze layers are arranged opposite to the spaced areas.

3. The glazing method for photovoltaic glass according to claim 2, characterized in that: The length of the second glaze layer in the first distribution direction or the second distribution direction is greater than the length of the spacing area in the first distribution direction or the second distribution direction.

4. The glazing method for photovoltaic glass according to any one of claims 1 to 3, characterized in that: In the first-side glazing step, increasing the thickness of the glaze layer and the content of the glass powder; And / or, in the second-side glazing step, the glaze layer thickness is increased and the glass powder content is increased.

5. The glazing method for photovoltaic glass according to any one of claims 1 to 3, characterized in that: Before the first surface glazing step, a pretreatment step is also included, including but not limited to pretreatment of the original glass by at least one of opening holes, edge grinding and cleaning; And / or, a testing step is further included after the tempering step to test the reflectivity and impact resistance of the tempered double-sided enameled glass.

6. A glazed photovoltaic glass, characterized in that: The glazed photovoltaic glass is prepared by the glazing method of any one of claims 1 to 5, wherein the glazed photovoltaic glass comprises: Original glass; A plurality of first glaze layers are arranged on the first surface of the original glass at intervals along the first distribution direction or the second distribution direction; A plurality of second glaze layers are arranged at intervals on the second surface of the original glass along the first distribution direction or the second distribution direction.

7. The glazed photovoltaic glass according to claim 6, characterized in that: There is a spacing area between adjacent first glaze layers, and the second glaze layer is arranged opposite to the spacing area.

8. The glazed photovoltaic glass according to claim 7, characterized in that: The length of the second glaze layer in the first distribution direction is greater than the length of the spacing area in the first distribution direction, and the length of the second glaze layer in the second distribution direction is greater than the length of the spacing area in the second distribution direction.

9. The glazed photovoltaic glass according to claim 6, characterized in that: The original glass is rolled glass or float glass, and the first surface is the embossed surface of the rolled glass or the non-tin surface of the float glass.

10. The glazed photovoltaic glass according to claim 8, characterized in that: The length of the spacing area in the first distribution direction or the second distribution direction is B; The length of the second glaze layer in the first distribution direction or the second distribution direction is L; The overlapping length of one side of the second glaze layer and the first glaze layer adjacent to the side in the first distribution direction or the second distribution direction is △L; The angle between the incident solar ray and the surface of the glazed photovoltaic glass is α; The thickness of the glazed photovoltaic glass is T; Then △L=(LB) / 2=T / tanα.

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