Glass backboard of photovoltaic module and photovoltaic module

Abstract

The utility model discloses a glass backboard of a photovoltaic assembly and the photovoltaic assembly, and belongs to the technical field of photovoltaic assemblies, the glass backboard comprises a backboard body, the backboard body is provided with at least one opening, the opening is of a long strip-shaped hole structure, and two ends of the long strip-shaped hole in the length direction are arc-shaped structures protruding outwards; the holes are used for bus bar leads to penetrate through, and the bus bar leads are bent and then attached to the portions, at the two ends of the length of the holes, of the surface of the backboard body. The photovoltaic module comprises a glass panel, a battery piece and the glass back plate, and the glass panel and the glass back plate are located on the front face and the back face of the battery piece respectively. A bus bar lead is arranged on one side, close to the glass back plate, of each battery piece, and the bus bar leads penetrate through the holes to the outside of the glass back plate. According to the utility model, the photovoltaic assembly can reduce the pressure of the lead on the opening during glass combination, and reduces the risk of sheet cracking at the opening.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a glass back plate of a photovoltaic component and a photovoltaic component. Background Art

[0002] As a low-carbon renewable energy source, the solar energy industry plays an important role in future energy. Double-glass photovoltaic modules in photovoltaic power generation are a very promising technology in the photovoltaic industry. With good market demand and development prospects, it is a type of module with great promotion value.

[0003] The double-glass photovoltaic module is composed of five layers of structure from top to bottom, namely, front glass, encapsulation film, solar cell, encapsulation film and back glass. In particular, the busbar leads of the module are arranged to pass through the back glass. At present, holes need to be opened in the back glass on the market to allow the busbar leads to pass through. For example, a Chinese patent document with publication number CN117976746A discloses a photovoltaic module, including a glass back panel, a rear encapsulation film, a solar cell, a front encapsulation film and a glass front panel stacked in sequence; the glass back panel is provided with at least one opening, the glass back panel includes at least one impact-resistant zone, the stress of the impact-resistant zone is greater than or equal to 80MPa, and the impact-resistant zone is arranged at the periphery of the opening and / or at the corners of the glass back panel.

[0004] The impact-resistant zone in this patent document can improve the impact resistance of photovoltaic modules. However, the busbar leads are poorly matched with the circular openings. When the photovoltaic modules are assembled, the leads will be pressed. The leads are tilted at a certain angle in the circular openings, which increases the pressure on the openings and easily causes cracks at the openings, affecting the yield rate. Utility Model Content

[0005] The purpose of the utility model is to provide a glass back panel and a photovoltaic module for a photovoltaic module, so as to solve the problem in the prior art that when the photovoltaic module is glassed, the lead wires are pressed, the lead wires are tilted at a certain angle in the circular opening, which increases the pressure on the opening and easily causes cracks at the opening position.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a glass backplane of a photovoltaic module, including a backplane body, on which at least one opening is arranged, the opening is a long strip hole structure and the two ends of the length of the long strip hole are arc structures protruding outward; the opening is used for bus bar leads to pass through, and the bus bar leads are bent and adhered to the surface of the backplane body at the two ends of the length of the opening.

[0007] Furthermore, the plurality of openings are arranged in a straight line or an arc shape on the surface of the back plate body.

[0008] Furthermore, the plurality of openings are arranged at equal distances.

[0009] Furthermore, the openings are of the same shape and size.

[0010] Furthermore, the back plate body is provided with three openings, and the three openings are arranged at intervals along the midline of the width direction of the back plate body.

[0011] Furthermore, the distance between two adjacent openings is 15-25 times the length of the openings.

[0012] Furthermore, the thickness of the back plate body is 1 mm to 3.2 mm.

[0013] Furthermore, the inner wall of the opening has a smooth transition.

[0014] The utility model also provides a photovoltaic module, including a glass panel, a battery cell and the above-mentioned glass back panel, wherein the glass panel and the glass back panel are respectively located on the front and back sides of the battery cell; a bus bar lead is provided on the side of the battery cell close to the glass back panel, and the bus bar lead passes through the opening to the outside of the glass back panel.

[0015] Furthermore, a first adhesive film is arranged between the glass back plate and the battery cell, a second adhesive film is arranged between the glass panel and the battery cell, and the busbar lead passes through the first adhesive film.

[0016] Compared with the existing known technologies, the technical solution provided by the utility model has the following beneficial effects:

[0017] The utility model discloses a glass back plate of a photovoltaic module, in which an opening is a long strip-shaped hole structure and both ends are arc-shaped structures. Compared with the traditional round hole structure, the opening of the utility model has a longer and more sufficient space to reserve a suitable position for the bus bar lead. When the glass is pressed together, the longer space reserves more space for the inclination of the lead, which can buffer the inclination stroke of the lead, reduce the pressure of the lead on the opening when the glass is closed, reduce the risk of cracks at the opening, and improve the product yield.

[0018] It will be apparent that elements or features described above in the context of a single embodiment may be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

[0020] Figure 1 It is a schematic diagram of the structure of the busbar lead in the circular opening of the glass back plate in the prior art;

[0021] Figure 2 It is a schematic diagram of the structure of the busbar lead wire during glass closing in the prior art;

[0022] Figure 3 It is a schematic diagram of the structure of a photovoltaic assembly according to an embodiment of the utility model;

[0023] Figure 4 It is a structural schematic diagram of a glass back plate of an embodiment of the utility model;

[0024] Figure 5 This is a state diagram of the busbar lead in the opening of the embodiment of the utility model;

[0025] Figure 6 This is a state diagram of the busbar lead of the embodiment of the utility model when it is closed in the opening.

[0026] Description of Reference Numerals

[0027] 100, back panel body; 110, opening; 200, bus bar lead; 300, first adhesive film; 400, battery cell; 500, second adhesive film; 600, glass panel. DETAILED DESCRIPTION

[0028] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0029] Example

[0030] At present, the glass backplane openings of double-glass photovoltaic modules on the market are mostly circular openings 110, such as Figure 1 and Figure 2 As shown, the circular opening 110 and the busbar lead 200 are poorly matched, and the busbar lead 200 is in a tilted state in the circular opening 110. When the glass is pressed together, it is very easy to cause the battery cell to crack, affecting the yield rate.

[0031] To overcome the above defects, please refer to Figure 3-Figure 6The present embodiment provides a glass backplane of a photovoltaic module, including a backplane body 100, on which at least one opening 110 is arranged, the opening 110 is a long strip hole structure, and the two ends of the length of the long strip hole are arc structures protruding outward. The opening 110 is used for the busbar lead 200 to pass through, and the busbar lead 200 is bent and attached to the surface of the backplane body 100 at the two ends of the length of the opening 110. Compared with the structure of the traditional circular opening 110, the opening 110 of the present embodiment has a longer and more sufficient space to reserve a suitable position for the busbar lead 200. When the glass is pressed, the longer space reserves more space for the inclination of the busbar lead 200, which can buffer the inclination travel of the busbar lead 200, reduce the pressure of the busbar lead 200 on the opening 110 when the glass is closed, reduce the risk of cracks at the opening 110, and improve the product yield.

[0032] Specifically, the opening 110 in this embodiment can be a rounded rectangular hole. According to statistics, the crack rate of the traditional circular opening 110 is as high as 40%, while the crack rate of the rounded rectangular hole used in this embodiment is only 0.1%. Without changing the substrate, the circular opening 110 is changed to a rounded rectangular hole, so that the position matching performance of the opening 110 and the busbar lead 110 is improved, and the rounded rectangular opening 110 can avoid pressing the lead, avoid the cell cracking in the glass bonding and lamination process, and improve the module yield rate.

[0033] Please refer to Figure 3 and Figure 4 In this embodiment, the backplane body 100 is provided with three openings 110, and the three openings 110 are arranged at intervals along the midline of the width direction of the backplane body 100. This makes the force uniformity of the backplane body 100 symmetrical along the midline, and the force uniformity of the backplane body 100 is high, which can further reduce the probability of the backplane body 100 being damaged when impacted by external force. It should be noted that the number of openings 110 is not limited to three, and can also be one, two, four or even more.

[0034] Furthermore, in this embodiment, the three openings 110 are arranged in a straight line on the surface of the backplane body 100. The three openings 110 arranged in a straight line can avoid the concentrated arrangement of the busbar leads 200, and can disperse the busbar leads 200 to each opening 110, so as to avoid excessive concentration of pressure during glass bonding, which is conducive to enhancing the structural rigidity of the glass backplane. Of course, the three openings 110 can also be arranged in an arc shape, which can also play the role of dispersing the leads. The arrangement of the openings 110 is not unique and can be designed according to the actual size of the glass backplane.

[0035] In addition, in the present embodiment, the three openings 110 are arranged equidistantly, and each opening 110 has the same shape and size. The equidistant arrangement of the openings 110 is conducive to ensuring that the glass back panel is subjected to uniform force at the position of the openings 110 when the glass is combined, and avoiding the glass back panel from being broken due to uneven force. The shape and size of each opening 110 are the same, which can further ensure the uniformity of the force on the glass back panel. Specifically, the spacing between two adjacent openings 110 is 15-25 times the length of the opening 110. The structure of the glass back panel that meets this ratio has better rigidity, which can further prevent the glass back panel from breaking. It should be noted that the inner wall of the opening 110 has a smooth transition. When the glass back panel is impacted by an external force, the hole wall of the opening 110 is evenly stressed, and there is no local high stress point, which is convenient for dispersing stress and can avoid damage to the opening 110 caused by external force impact. The thickness of the back plate body 100 is 1 mm to 3.2 mm. The back plate body 100 is a rectangular structure as a whole, and the four corners of the rectangle are rounded or chamfered according to design requirements.

[0036] Another aspect of the present application provides a photovoltaic module, including a glass panel 600, a cell 400 and a glass backplane, wherein the glass panel 600 and the glass backplane are respectively located on the front and back sides of the cell 400; a busbar lead 200 is provided on the side of the cell 400 close to the glass backplane, and the busbar lead 200 passes through the opening 110 to the outside of the glass backplane. When the photovoltaic module is in use, the glass backplane is on the backlight side and is not exposed to sunlight, nor is it impacted by rain, snow, hail, etc. Therefore, the position of the opening 110 can be better protected to prevent the glass backplane from being damaged by impacts such as hail, thereby improving the durability of the photovoltaic module.

[0037] Furthermore, a first adhesive film 300 is arranged between the glass backplane and the battery cell 400, a second adhesive film 500 is arranged between the glass panel 600 and the battery cell 400, and the busbar lead 200 passes through the first adhesive film 300. The first adhesive film 300 and the second adhesive film 500 are used to bond the photovoltaic battery cell 400, the glass backplane and the glass panel 600. The main function is to protect the battery cell 400 and encapsulate it into a photovoltaic module that can output direct current. There are many types of adhesive films, with different characteristics and very different applicable scenarios. The types of adhesive films currently on the market include transparent EVA film, white EVA film, POE film, EPE film, etc. This application uses POE film, which uses POE resin as the raw material, and is used for single-product PERC double-sided and N-type battery modules. It is widely used in double-glass modules of high-efficiency batteries, and has a higher water vapor barrier rate, better weather resistance and stronger anti-PID performance.

[0038] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A glass backplane of a photovoltaic module, comprising a backplane body (100), wherein at least one opening (110) is provided on the backplane body (100), characterized in that: The opening (110) is in the form of an elongated hole structure, and the two ends of the length of the elongated hole are arc-shaped structures protruding outwards; the opening (110) is used for allowing the busbar lead (200) to pass through, and the busbar lead (200) is bent and adhered to the surface of the backplane body (100) at the two ends of the length of the opening (110).

2. The glass back plate of a photovoltaic module according to claim 1, characterized in that: The plurality of openings (110) are arranged in a straight line or in an arc shape on the surface of the back plate body (100).

3. The glass back plate of a photovoltaic module according to claim 2, characterized in that: The plurality of openings (110) are arranged at equal distances.

4. The glass back plate of a photovoltaic module according to claim 2, characterized in that: The plurality of openings (110) have the same shape and are equal in size.

5. The glass back plate of a photovoltaic module according to claim 2, characterized in that: The back plate body (100) is provided with three openings (110), and the three openings (110) are arranged at intervals along the midline of the width direction of the back plate body (100).

6. The glass back plate of a photovoltaic module according to claim 3, characterized in that: The distance between two adjacent openings (110) is 15-25 times the length of the opening (110).

7. The glass back plate of a photovoltaic module according to claim 1, characterized in that: The thickness of the back plate body (100) is 1 mm to 3.2 mm.

8. The glass back plate of a photovoltaic module according to claim 1, characterized in that: The inner wall of the opening (110) has a smooth transition.

9. A photovoltaic module, characterized in that: The invention comprises a glass panel (600), a battery cell (400) and a glass backplane according to any one of claims 1 to 8, wherein the glass panel (600) and the glass backplane are respectively located on the front and back sides of the battery cell (400); a busbar lead (200) is provided on the side of the battery cell (400) close to the glass backplane, and the busbar lead (200) passes through the opening (110) to the outside of the glass backplane.

10. A photovoltaic module according to claim 9, characterized in that: A first adhesive film (300) is arranged between the glass back plate and the battery cell (400), a second adhesive film (500) is arranged between the glass panel (600) and the battery cell (400), and the busbar lead (200) passes through the first adhesive film (300).

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