Photovoltaic curtain wall glass and preparation method thereof

Abstract

The embodiments of the present invention disclose a photovoltaic curtain wall glass and a method for manufacturing the same. The photovoltaic curtain wall glass comprises: a bottom sheet glass; a first layer of PVB adhesive disposed on the bottom sheet glass; a photovoltaic cell array disposed on a side of the first layer of PVB adhesive away from the bottom sheet glass; the photovoltaic cell array comprises a plurality of double-glass component units arranged according to a target array, and each of the double-glass component units comprises: a double-glass component glass and a cell, the cell being bonded between the double-glass component glasses via EVA adhesive; a second layer of PVB adhesive disposed on a side of the photovoltaic cell array away from the first layer of PVB adhesive; and an outer sheet of glass disposed on a side of the second layer of PVB adhesive away from the photovoltaic cell array. The photovoltaic curtain wall glass disclosed by the present invention has good safety and stability.

Description

Technical Field

[0001] The present invention belongs to the field of glass deep processing, and in particular relates to a photoelectric curtain wall glass and a preparation method thereof. Background Art

[0002] Photovoltaic curtain wall glass is a product used in BIPV (Building Integrated Photovoltaics). Due to cost constraints, the crystalline silicon cells used for photovoltaic power generation are extremely thin. The brittle nature of ceramics makes these extremely thin crystalline silicon cells very fragile. Therefore, when crystalline silicon cells are used in laminated products, EVA is typically used as an adhesive. In the building curtain wall industry, however, due to higher safety requirements, PVB is often used as an adhesive for laminated glass. Unlike EVA, which flows upon heating, PVB is a non-cross-linked thermoplastic and lacks heat flow. However, when PVB is directly laminated onto crystalline silicon cells, it is very prone to cracking and damage, resulting in extremely low yields. Currently, there are few solutions to this problem, other than controlling breakage through inefficient lamination processes. This, in turn, contributes to the high cost of photovoltaic cell modules used in BIPV.

[0003] Therefore, the present invention provides a photovoltaic curtain wall glass and a preparation method thereof to solve the above-mentioned deficiencies in the prior art. Summary of the Invention

[0004] In view of at least some of the defects and deficiencies in the prior art, an embodiment of the present invention provides a photovoltaic curtain wall glass and a method for preparing the same, which has the characteristics of efficient production, safety, and good stability.

[0005] In one aspect, one embodiment of the present invention discloses a photovoltaic curtain wall glass, comprising negative glass;

[0006] A first layer of PVB glue is provided on the negative glass;

[0007] A photovoltaic cell array is provided on a side of the first layer of PVB adhesive away from the backsheet glass, the photovoltaic cell array comprising a plurality of double-glass module units arranged according to a target array, and each of the double-glass module units comprises: double-glass module glass and a cell, the cell being bonded between the double-glass module glass via EVA adhesive;

[0008] A second layer of PVB glue is provided on a side of the photovoltaic cell array away from the first layer of PVB glue; and

[0009] The outer glass is arranged on the side of the second layer of PVB adhesive away from the photovoltaic cell array.

[0010] In one embodiment, the photovoltaic curtain wall glass further includes an intermediate layer of PVB glue, located between the first layer of PVB glue and the second layer of PVB glue, for filling the boundary position of the photovoltaic cell array and the gaps between the multiple double-glass component units.

[0011] In one embodiment, the bottom sheet glass is any one of tempered white glass, non-tempered white glass, tempered ultra-clear glass or original ultra-clear glass;

[0012] The outer glass is any one of tempered white glass, non-tempered white glass, tempered ultra-white glass, original ultra-white glass or coated colored glass.

[0013] In one embodiment, among the plurality of double-glass component units, the distance between every two adjacent double-glass component units is not less than 80 mm.

[0014] In one embodiment, in a direction perpendicular to the thickness direction of the photovoltaic curtain wall glass, the width of the gap between the edge of the photovoltaic cell array and the edge of the photovoltaic curtain wall glass is not less than 100 mm.

[0015] In one embodiment, the thickness of the bottom sheet glass and the outer sheet glass ranges from 5 to 19 mm, and the maximum size is 3300 mm×6000 mm.

[0016] On the other hand, one embodiment of the present invention discloses a method for preparing photovoltaic curtain wall glass, comprising the following steps:

[0017] S1: Lay the first layer of PVB glue on the negative glass;

[0018] S2: Laying a plurality of double-glass component units on a side of the first layer of PVB adhesive away from the bottom glass, wherein each of the double-glass component units comprises: double-glass component glass and a cell, and the cell is bonded to the double-glass component glass by EVA adhesive;

[0019] S3: connecting the plurality of double-glass component units to form a photovoltaic cell array;

[0020] S4: Laying a second layer of PVB adhesive on a side of the photovoltaic cell array away from the first layer of PVB adhesive;

[0021] S5: Laying an outer glass sheet on the side of the second layer of PVB adhesive away from the photovoltaic cell array to obtain a glass sandwich;

[0022] S6: forming the glass interlayer to obtain the photovoltaic curtain wall glass.

[0023] In one embodiment, between step S3 and step S4, the following steps are further included:

[0024] S31: Filling the gaps between the boundary positions of the photovoltaic cell array and the plurality of double-glass component units with an intermediate layer of PVB glue.

[0025] In one embodiment, it is characterized in that the environmental parameters of the environment in steps S1 to S5 include: environmental cleanliness not less than 100,000 grade, environmental temperature 18-25° C., and environmental relative humidity 18%-28%.

[0026] In one embodiment, the moisture content of the first layer of PVB glue, the second layer of PVB glue, and the intermediate layer of PVB glue is 0.35% to 0.55%; the laying thickness of the first layer of PVB glue and the second layer of PVB glue is not less than 0.76 mm; and the laying thickness of the intermediate layer of PVB glue is the same as the thickness of the photovoltaic cell array, or the difference between the laying thickness of the intermediate layer of PVB glue and the thickness of the photovoltaic cell array is not greater than 1 mm.

[0027] The photovoltaic laminated glass and its preparation method disclosed in the above embodiments of the present invention have at least the following beneficial effects:

[0028] (1) Using PVB glue as adhesive, the product can be safely used in the field of photovoltaic curtain walls;

[0029] (2) It can be made on a laminating interlayer line or a rolling interlayer line, and has universal characteristics for equipment conditions;

[0030] (3) The preparation process is simple, the production cost is low, and the production efficiency is high;

[0031] (4) It can realize the preparation of large-area photovoltaic curtain wall glass;

[0032] (5) The photovoltaic curtain wall glass prepared by this technology avoids the pollution and damage to the environment and human body caused by organic chemical raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a schematic diagram of the exploded structure of a photovoltaic curtain wall glass disclosed in one embodiment of the present invention;

[0035] Figure 2 A schematic side view of a photovoltaic curtain wall glass disclosed in one embodiment of the present invention;

[0036] Figure 3 A schematic top view of a photovoltaic curtain wall glass disclosed in one embodiment of the present invention;

[0037] Figure 4 A schematic side view of another photovoltaic curtain wall glass disclosed in one embodiment of the present invention;

[0038] Figure 5 The present invention is a flow chart of a method for preparing photovoltaic curtain wall glass disclosed in one embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following, in conjunction with the accompanying drawings and specific implementations, clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0043] Reference Figures 1 to 3 , Figure 1 This is a schematic diagram of the exploded structure of a photovoltaic curtain wall glass disclosed in one embodiment of the present invention. The photovoltaic curtain wall glass includes a bottom glass 10, a first layer of PVB glue 41 disposed on the bottom glass 10, a photovoltaic cell array 20 disposed on a side of the first layer of PVB glue 41 away from the bottom glass 10, a second layer of PVB glue 42 disposed on a side of the photovoltaic cell array 20 away from the first layer of PVB glue 41, and an outer glass 30 disposed on a side of the second layer of PVB glue 42 away from the photovoltaic cell array 20. Figure 2The figure shows a side view of the photovoltaic curtain wall glass disclosed in one embodiment. Figure 3 FIG. 1 is a top view of a photovoltaic curtain wall glass disclosed in one embodiment, referring to FIG. Figure 2 and Figure 3 , wherein the photovoltaic cell array 20 includes a plurality of double-glass component units 21 arranged according to a target array, wherein the target array is determined according to actual design requirements, for example Figure 3 The dotted box shown in FIG is a double-glass component unit 21, wherein the photovoltaic curtain wall glass includes 2 rows and 4 columns, a total of 8 double-glass component units 21. It should be noted that this embodiment does not limit the target array to a rectangular array, and can also be other shapes. Figure 2 Each double-glass component unit 21 includes a double-glass component glass 211 and a battery cell 212. The battery cell 212 is bonded to the double-glass component glass 211 by an EVA adhesive 213. Figure 3 Each double-glass component unit 21 includes, for example, 4 rows and 4 columns, totaling 16 cells 211. Of course, this embodiment does not limit the number of cells 211 contained in each double-glass component unit 21 and their arrangement, which can be selected according to the required parameters such as transmittance and light absorption area. Among them, multiple double-glass component units 21 are also connected in series, parallel or mixed connection according to design requirements to form a photovoltaic cell array 20, and their specific connection structure adopts the connection structure of a conventional photovoltaic cell, which will not be repeated in this embodiment. The first layer of PVB glue 41 and the second layer of PVB glue 42 specifically adopt, for example, PVB film, which is a commonly used adhesive material in the field, which will not be repeated in this embodiment, and of course this embodiment is not limited to this. The cell 212 is, for example, a single-crystal silicon or polycrystalline silicon photovoltaic cell, which and the EVA adhesive 213 are both commonly used materials in the field, which will not be repeated in this embodiment. In this embodiment, the cell 211 is bonded between the double-glass component glass 212 using EVA adhesive 213 to form a small-sized double-glass component unit 21. The double-glass component units 21 are then connected according to a designed connection scheme to form a photovoltaic cell array 20. PVB glue is used as an adhesive to bond the photovoltaic cell array 20 between the bottom glass 10 and the outer glass 30. This solves the problem that the photovoltaic curtain wall glass is prone to cracking and damage when directly interlayered with PVB, while ensuring the stability of the photovoltaic curtain wall glass using PVB as an adhesive.

[0044] Further, such as Figure 4 FIG. 1 is a side view of a photovoltaic curtain wall glass disclosed in another embodiment of the present invention, referring to FIG. Figure 4 The photovoltaic curtain wall glass also includes an intermediate layer of PVB glue 43, which is located between the first layer of PVB glue 41 and the second layer of PVB glue 42 and is used to fill the boundary position of the photovoltaic cell array 20 and the gap between the multiple double-glass component units 21. Figure 3 In the figure, the black frame line is the edge of the photovoltaic curtain wall glass, the gray oblique line shadow filling part is the boundary position of the photovoltaic cell array 20, the dotted frame shows a double-glass component unit 21, and the blank part between multiple double-glass component units 21 is the gap. In the actual manufacturing process, since the double-glass component unit 21 has a certain thickness, when its thickness is large, the gap between adjacent double-glass component units 21 is also large, and the difficulty of vacuuming in the production process becomes greater. By filling the middle layer of PVB glue 43, a better vacuuming effect can be achieved to ensure the quality of the photovoltaic curtain wall glass. It should be noted that in the above embodiment, the thickness of each component in the figure is only used to distinguish the layers, and the actual thickness ratio is not limited by this.

[0045] In one embodiment of the present invention, the bottom glass 10 can be, for example, tempered clear glass, untempered clear glass, tempered ultra-clear glass, or raw ultra-clear glass, and the outer glass 30 can be tempered clear glass, untempered clear glass, tempered ultra-clear glass, raw ultra-clear glass, or coated colored glass. Ultra-clear glass has higher transparency than ordinary clear glass, while tempered glass offers greater safety. The coating treatment of the outer glass 30 can achieve the desired color while meeting the product's optical performance.

[0046] In one embodiment of the present invention, the distance between each two adjacent double-glass component units 21 is not less than 80 mm. Figure 2 Taking b2 as an example, b2 is the distance between adjacent double-glass module units 21 in a group, that is, b2 is not less than 80 mm. It should be noted that this embodiment does not limit the double-glass module units 21 to be arranged at equal intervals. The distances between adjacent double-glass module units 21 at different locations can be the same or different, and this embodiment does not limit this.

[0047] In one embodiment of the present invention, in a direction perpendicular to the thickness direction of the photovoltaic curtain wall glass, the width of the gap between the edge of the photovoltaic cell array 20 and the edge of the photovoltaic curtain wall glass is not less than 100 mm. Figure 2 b1 is the distance from the outer edge of the double-glass module unit 21 in the outermost layer of the photovoltaic cell array 20 in the figure to the outer edge of the bottom glass 10. b1 is not less than 100 mm, that is, the gap width between the photovoltaic cell array 20 and the edge of the photovoltaic curtain wall glass is not less than 100 mm. It should be noted that this embodiment does not limit the b1 on the left and right sides to be the same size as shown in the figure. For example, if the photovoltaic curtain wall glass is rectangular, the gap widths on all four sides can be the same or different. Of course, this embodiment does not limit the specific shape of the photovoltaic curtain wall glass, and it can also be other shapes.

[0048] Furthermore, the thickness of the bottom glass 10 and the outer glass 30 ranges from 5 to 19 mm, specifically 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 15 mm, and 19 mm. The maximum glass size can be 3300 mm × 6000 mm.

[0049] Reference Figure 5 One embodiment of the present invention further provides a method for preparing a photovoltaic curtain wall, comprising the following steps:

[0050] S1: Lay the first layer of PVB glue on the negative glass;

[0051] S2: Laying a plurality of double-glass component units on a side of the first layer of PVB adhesive away from the bottom glass, wherein each of the double-glass component units comprises: double-glass component glass and a cell, and the cell is bonded to the double-glass component glass by EVA adhesive;

[0052] S3: connecting the plurality of double-glass component units to form a photovoltaic cell array;

[0053] S4: Laying a second layer of PVB adhesive on a side of the photovoltaic cell array away from the first layer of PVB adhesive;

[0054] S5: Laying an outer sheet of glass on the side of the second layer of PVB adhesive away from the photovoltaic cell array to obtain a glass sandwich.

[0055] S6: forming the glass interlayer to obtain the photovoltaic curtain wall glass.

[0056] For example, the method for preparing photovoltaic curtain wall glass disclosed in this embodiment can be used to prepare Figure 1 The photovoltaic curtain wall glass shown, reference Figure 1The structure of the photovoltaic curtain wall glass shown has a specific preparation process as follows: first, the pre-prepared negative glass 10, outer glass 30 and double-glass component unit 21 are cleaned and dried in a cleaning machine and then transferred to a clean workshop for standby use. In the clean workshop, a first layer of PVB glue 41 is laid on the negative glass 10, and then the double-glass component unit 21 is laid on the first layer of PVB glue 41. The double-glass component unit 21 is connected according to design requirements, such as in series, parallel or mixed connection, to form a photovoltaic cell array 20, and then a second layer of PVB glue 42 is laid on the photovoltaic cell array 20. Finally, the outer glass 30 is laid on the second layer of PVB glue 42 to obtain a glass interlayer. After the glass interlayer is formed, the photovoltaic curtain wall glass is obtained. The forming process of the glass interlayer includes, for example, trimming excess PVB glue, vacuuming, heating, and pressurizing on a laminator, or heating and pressurizing on a roller press followed by vacuuming, and finally further processing in an autoclave to obtain the photovoltaic curtain wall glass. The equipment used is conventional equipment in the field and will not be described in detail in this embodiment. Of course, the above-mentioned forming process is only for illustration, and this embodiment does not limit its specific equipment and process. This method can be produced on a laminating interlayer line or a roller interlayer line. The equipment conditions have universal characteristics, production is simple, and the photovoltaic curtain wall glass prepared is safe and stable.

[0057] Furthermore, in one embodiment, the above preparation steps further include step S31 between step S3 and step S4: filling an intermediate layer of PVB glue in the gaps between the boundary positions of the photovoltaic array cells and the plurality of double-glass component units.

[0058] Based on this, the preparation method of the photovoltaic curtain wall glass disclosed in this embodiment can also be used to prepare Figure 4 The photovoltaic curtain wall glass shown, refer to Figure 4 The structure of the photovoltaic curtain wall glass shown in Figure 1 Based on the preparation method of photovoltaic curtain wall glass shown in FIG, this embodiment achieves this by first laying an intermediate layer of PVB glue 43 in the gap between the photovoltaic cell array 20 and the plurality of double-glass component units 21 before laying the second layer of PVB glue 42, and then laying the second layer of PVB glue 42. Figure 4 The preparation of photovoltaic curtain wall glass is shown in FIG. The laying of an intermediate layer of PVB glue 43 can achieve a better vacuuming effect in the subsequent molding process, thereby improving the quality of the photovoltaic curtain wall glass.

[0059] Furthermore, in one embodiment, the environmental parameters of the environment in steps S1 to S5 are, for example, an environmental cleanliness level not less than Class 100,000, an environmental temperature of 18°C ​​to 25°C, and a relative humidity of 18% to 28%. The environmental cleanliness level, temperature, and humidity are, for example, the indoor cleanliness level, temperature, and humidity of the clean room mentioned in the above embodiment.

[0060] Furthermore, in one embodiment, the moisture content of the first layer of PVB glue 41, the second layer of PVB glue 42 and the middle layer of PVB glue 43 in the above preparation steps is 0.35% to 0.55%. Figure 4 This is a schematic diagram of the side structure of laminated glass after installation in this embodiment. h1 is the thickness of the first layer of PVB adhesive 41, and h2 is the thickness of the second layer of adhesive 42. Both h1 and h2 are no less than 0.76 mm. Note that h1 and h2 can be equal or unequal, and this embodiment does not limit this. h3 is the thickness of the photovoltaic ribbon array 20, and h4 is the thickness of the intermediate layer of PVB adhesive 43. h4 is equal to h3, or the difference between h4 and h3 is no more than 1 mm.

[0061] It should be noted that the preparation method of the photovoltaic curtain wall glass disclosed in this embodiment can be used to prepare the photovoltaic curtain wall glass disclosed in the aforementioned embodiments. For relevant descriptions on the structure of the photovoltaic curtain wall glass, reference can be made to the aforementioned embodiments and will not be repeated here.

[0062] The photovoltaic laminated glass and its preparation method disclosed in the above embodiments of the present invention have at least the following beneficial effects:

[0063] (1) Using PVB glue as adhesive, the product can be safely used in the field of photovoltaic curtain walls;

[0064] (2) It can be made on a laminating interlayer line or a rolling interlayer line, and has universal characteristics for equipment conditions;

[0065] (3) The preparation process is simple, the production cost is low, and the production efficiency is high;

[0066] (4) It can realize the preparation of large-area photovoltaic curtain wall glass;

[0067] (5) The photovoltaic curtain wall glass prepared by this technology avoids the pollution and damage to the environment and human body caused by organic chemical raw materials.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A photovoltaic curtain wall glass, characterized in that: include: negative glass; A first layer of PVB glue is provided on the negative glass; A photovoltaic cell array is provided on a side of the first layer of PVB adhesive away from the backsheet glass, the photovoltaic cell array comprising a plurality of double-glass module units arranged according to a target array, and each of the double-glass module units comprises: double-glass module glass and a cell, the cell being bonded between the double-glass module glass via EVA adhesive, the cell being provided in a plurality and spaced apart from each other, and the cell being a single-crystal silicon photovoltaic cell or a polycrystalline silicon photovoltaic cell; Among the plurality of double-glass component units, the distance between each two adjacent double-glass component units is not less than 80 mm; A second layer of PVB glue is provided on a side of the photovoltaic cell array away from the first layer of PVB glue; an intermediate layer of PVB glue, located between the first layer of PVB glue and the second layer of PVB glue, for filling the boundary position of the photovoltaic cell array and the gaps between the plurality of double-glass module units, wherein the intermediate layer of PVB glue connects the first layer of PVB glue and the second layer of PVB glue; and The outer glass is arranged on the side of the second layer of PVB adhesive away from the photovoltaic cell array.

2. The photovoltaic curtain wall glass according to claim 1, characterized in that: The negative glass is any one of tempered white glass, non-tempered white glass, tempered ultra-clear glass or original ultra-clear glass; The outer glass is any one of tempered white glass, non-tempered white glass, tempered ultra-white glass, original ultra-white glass or coated colored glass.

3. The photovoltaic curtain wall glass according to claim 1, characterized in that: In a direction perpendicular to the thickness direction of the photovoltaic curtain wall glass, the width of the gap between the edge of the photovoltaic cell array and the edge of the photovoltaic curtain wall glass is not less than 100 mm.

4. The photovoltaic curtain wall glass according to claim 1, characterized in that: The thickness of the bottom sheet glass and the outer sheet glass ranges from 5 to 19 mm, and the maximum size is 3300 mm×6000 mm.

5. A method for preparing photovoltaic curtain wall glass, characterized in that: The steps include: S1: Lay the first layer of PVB glue on the negative glass; S2: Laying a plurality of double-glass module units on a side of the first layer of PVB adhesive away from the bottom glass, wherein each of the double-glass module units comprises: double-glass module glass and a cell, the cell being bonded to the double-glass module glass by EVA adhesive, the cell being in plurality, and being spaced apart, and the cell being a single-crystal silicon photovoltaic cell or a polycrystalline silicon photovoltaic cell; S3: connecting the plurality of double-glass component units to form a photovoltaic cell array; S4: Laying a second layer of PVB adhesive on a side of the photovoltaic cell array away from the first layer of PVB adhesive; S5: Laying an outer glass sheet on the side of the second layer of PVB adhesive away from the photovoltaic cell array to obtain a glass sandwich; S6: forming the glass interlayer to obtain the photovoltaic curtain wall glass.

6. The method for preparing photovoltaic curtain wall glass according to claim 5, characterized in that: Between step S3 and step S4, the method further includes: S31: Filling the gaps between the boundary positions of the photovoltaic cell array and the plurality of double-glass component units with an intermediate layer of PVB glue.

7. The method for preparing photovoltaic curtain wall glass according to claim 5, characterized in that: The environmental parameters of the environment in steps S1 to S5 include: environmental cleanliness not less than Class 100,000, environmental temperature 18 to 25° C., and environmental relative humidity 18% to 28%.

8. The method for preparing photovoltaic curtain wall glass according to claim 6, wherein: The moisture content of the first layer of PVB glue, the second layer of PVB glue and the intermediate layer of PVB glue is 0.35% to 0.55%; the laying thickness of the first layer of PVB glue and the second layer of PVB glue is not less than 0.76 mm; and the laying thickness of the intermediate layer of PVB glue is the same as the thickness of the photovoltaic cell array, or the difference between the laying thickness of the intermediate layer of PVB glue and the thickness of the photovoltaic cell array is not greater than 1 mm.

Images