Photovoltaic glass and photovoltaic module
By designing a concave-convex structure on the surface of photovoltaic glass, especially deepening the concave-convex structure at the edges, the problem of edge delamination of photovoltaic modules is solved, the adhesion is enhanced, moisture intrusion is prevented, and the life of the modules is extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LONGI PHOTOVOLTAIC TECHNOLOGY (JIAXING) CO LTD
- Filing Date
- 2024-12-17
- Publication Date
- 2026-04-14
AI Technical Summary
Delamination is prone to occur at the edges of photovoltaic modules, allowing moisture to enter the module, corrode the cells, increase the delamination area, and affect the module's lifespan.
A textured surface is designed on the photovoltaic glass, with a deeper area at the edge. The depth of the textured surface is greater than that of other areas, which increases the contact area between the adhesive film layer and the glass and enhances the adhesion.
It effectively reduces the risk of delamination at the edges of photovoltaic modules, improves adhesion, prevents moisture from entering, and extends module life.
Smart Images
Figure CN224124501U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of photovoltaic module technology, and in particular relates to a photovoltaic glass and a photovoltaic module. Background Technology
[0002] Photovoltaic modules are manufactured by stacking and laminating tempered glass, a pre-coating film, solar cells, a post-coating film, and a backsheet or back glass. It's important to note that the lamination process requires a high-temperature, high-pressure, and vacuum environment to melt the pre-coating and post-coating films, thus bonding the tempered glass to the backsheet. Furthermore, to ensure a strong bond, the surface of the tempered glass closest to the backsheet is embossed. Simultaneously, to prevent the pre-coating and post-coating films from overflowing, their width is smaller than the width of the backsheet and tempered glass.
[0003] As a result, the edges of the photovoltaic modules formed after the lamination process are relatively thin, making them most susceptible to delamination. Delamination at the edges of the photovoltaic modules allows moisture to enter, which can increase the area of the delaminated region and cause membrane hydrolysis, producing acetic acid that corrodes the solar cells. This accelerates the degradation of the photovoltaic modules and leads to module failure.
[0004] To reduce the risk of delamination, two existing improvement methods are employed: first, using a laminating frame to apply pressure to the edges of the photovoltaic module; second, increasing the width of the encapsulant film. The first method requires an additional laminating frame, making the assembly process more complex and increasing both component and labor costs. The second method increases the risk of encapsulant film overflow, leading to a higher risk of module contamination, and also increases the cost of the encapsulant film. Utility Model Content
[0005] This application provides a photovoltaic glass and a photovoltaic module to solve the technical problem that delamination easily occurs at the edges of existing photovoltaic modules.
[0006] According to one aspect of this application, a photovoltaic glass is provided, the photovoltaic glass having a concave-convex structure, the concave-convex structure covering one side surface of the photovoltaic glass and forming a concave-convex surface; the concave-convex surface has a deepening region located at the edge of the concave-convex surface, the concave-convex structure being a non-deepened region except for the deepening region, and the minimum depth of the concave-convex structure at the deepening region being greater than the maximum depth of the concave-convex structure at the non-deepened region of the concave-convex layer.
[0007] In an optional embodiment of this application, the width of the deepened area is 6 mm to 15 mm along the direction perpendicular to the edge of the photovoltaic glass.
[0008] In an optional embodiment of this application, the depth of the concave-convex structure in the deepened region is 100 μm to 300 μm.
[0009] In an optional embodiment of this application, the depth of the concave-convex structure in the non-deepened region is 15 μm to 75 μm.
[0010] In an optional embodiment of this application, the average depth of the concave-convex structure in the deepened area is 2 to 20 times the average depth of the concave-convex structure in the non-deepened area.
[0011] In an optional embodiment of this application, the deepened area is located on the two opposite edges of the concave and convex surfaces along the length direction of the photovoltaic glass and / or on the two opposite edges along the width direction of the photovoltaic glass.
[0012] In an optional embodiment of this application, the depth of the concave-convex structure in the deepening area gradually increases along the direction from the inside to the edge of the photovoltaic glass.
[0013] In an optional embodiment of this application, the cross-sectional shape of the concave-convex structure along the direction perpendicular to the photovoltaic glass plane is at least one of wavy, sawtooth, or polygonal.
[0014] According to another aspect of this application, a photovoltaic module is provided, the photovoltaic module including a front glass and an encapsulating film layer. The front glass is the photovoltaic glass described above; the encapsulating film layer at least covers the uneven surface.
[0015] In the optional scheme of this application, the photovoltaic module is a single-glass module.
[0016] In summary, the photovoltaic glass and photovoltaic modules provided in this application have at least the following beneficial effects:
[0017] The photovoltaic glass provided in this embodiment has a textured structure on one surface, which covers the surface of the photovoltaic glass and forms a corresponding uneven surface. It should be noted that the textured structure here can refer to a textured structure formed on the surface of the photovoltaic glass, that is, as an embossing on the surface of the photovoltaic glass.
[0018] The areas with greater depth in the concave-convex structure correspond to the deepened areas, while the other areas of the concave-convex structure are non-deepened areas. Notably, the minimum depth of the concave-convex structure in the deepened areas is greater than the maximum depth of the concave-convex structure in the non-deepened areas.
[0019] This design increases the contact area between the edge of the photovoltaic glass and the adhesive film layer, ensuring greater adhesion at the edge and reducing the risk of delamination at the edge of the photovoltaic module. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 A cross-sectional view of a photovoltaic glass provided according to one embodiment of this application;
[0022] Figure 2 This is a schematic diagram of a photovoltaic module provided according to one embodiment of this application.
[0023] The attached figures are labeled as follows:
[0024] 10. Photovoltaic glass; 11. Concave-convex surface; S. Deepened area;
[0025] 21. First membrane layer; 22. Second membrane layer; 23. Backsheet;
[0026] 30. Anti-dust frame. Detailed Implementation
[0027] In this application, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0028] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0029] Figure 1 The present invention provides a cross-sectional view of a photovoltaic glass 10 according to one embodiment of the present application. The photovoltaic glass 10 has a concave-convex structure that covers one side surface of the photovoltaic glass 10 and forms a concave-convex surface 11.
[0030] The concave-convex structure has a deepened area S, which is located at the edge of the concave-convex surface 11. The concave-convex structure is not deepened except for the deepened area S. The minimum depth of the concave-convex structure at the deepened area S is greater than the maximum depth of the concave-convex structure at the non-deepened area.
[0031] The photovoltaic glass 10 provided in this embodiment has a concave-convex structure on one surface, which covers the surface of the photovoltaic glass 10 and forms a concave-convex surface 11.
[0032] It should be noted that the uneven structure here can refer to the textured structure formed on the surface of the photovoltaic glass 10, that is, the surface of the photovoltaic glass 10 is uneven. The uneven shape can form many microcavity structures on the surface of the photovoltaic glass 10, that is, the uneven structure is the embossing on the surface of the photovoltaic glass 10.
[0033] Furthermore, the depth distribution of the concave-convex structure on the concave-convex surface 11 is not uniform. The concave-convex structure at the edge of the concave-convex surface 11 is deeper, corresponding to the deepened area S, while the concave-convex structure outside the edge of the concave-convex surface 11 is shallower, corresponding to the non-deepened area. The depth of the concave-convex structure in the deepened area S is greater than the depth of the concave-convex structure in the non-deepened area. Specifically, the minimum depth of the concave-convex structure in the deepened area S is greater than the maximum depth of the concave-convex structure in the non-deepened area.
[0034] It should be noted that the depth here refers to the height difference between the protrusions and concave points in the uneven structure on the surface of the photovoltaic glass 10, that is, the depth of each microcavity formed by the uneven structure. In specific applications, the cross-sectional shape of the uneven structure along the direction perpendicular to the plane of the photovoltaic glass 10 is at least one of wavy, sawtooth, and polygonal shapes. The polygonal shape here can be quadrilateral or hexagonal, etc.
[0035] For example, when the shape of the convex-concave structure is wavy, the depth refers to the height difference between the crests and troughs. When the shape of the convex-concave structure is serrated, the depth refers to the height difference between the tips and roots of the teeth. These will not be listed in detail here.
[0036] In practical applications, the concave and convex structures at the deepened area S and the non-deepened area can be the same or different. For example, the structure at the deepened area S can be serrated, while the concave and convex structures at the non-deepened area can be polygonal. That is, the concave and convex structures can be combinations of various shapes.
[0037] The deepened area S is located at the edge of the uneven surface 11. This increases the contact area between the adhesive film layer and the deepened area S of the uneven surface 11, even when the adhesive film layer is very thin at the edge of the photovoltaic module, thereby increasing the adhesion and reducing the risk of delamination at the edge of the photovoltaic module.
[0038] As can be seen, the depth distribution of the concave and convex structure on the concave and convex surface 11 of the photovoltaic glass 10 provided in this application is shallow in the middle and deep at the edges. This ensures the contact area between the edge of the photovoltaic glass 10 and the adhesive film layer, ensures greater adhesion at the edge, and reduces the risk of delamination at the edge of the photovoltaic module.
[0039] In a further optional embodiment, the deepened region S is located on the two opposite edges of the concave-convex surface 11 along the length direction of the photovoltaic glass and / or on the two opposite edges along the width direction of the photovoltaic glass.
[0040] It should be noted that the photovoltaic glass 10 provided in this application can be made into a concave-convex structure on the surface of the photovoltaic glass 10 by roller embossing (or roller printing embossing) process.
[0041] For example, when the photovoltaic glass 10 is rectangular, the deepened region S is located at the opposite two edges along the length direction of the photovoltaic glass 10. Alternatively, the deepened region S is located at the opposite two edges along the width direction of the photovoltaic glass 10.
[0042] Alternatively, the photovoltaic glass 10 may have a deepening zone S around all four edges, that is, the two opposite edges along the length direction and the two opposite edges along the width direction of the photovoltaic glass 10 may have a deepening zone S.
[0043] Preferably, the deepened areas S are located at opposite edges of the photovoltaic glass 10, meaning that the photovoltaic glass 10 has deepened areas S at opposite edges along its width, or vice versa. This is mainly due to limitations in the roller embossing process. It should be understood that providing deepened concave-convex structures at both axial ends of the roller can correspondingly form the deepened areas S arranged on opposite sides, resulting in relatively low manufacturing costs.
[0044] If manufacturing process and other factors are not considered, a deepening area S can be set on all four edges of the uneven surface 11 on the surface of the photovoltaic glass 10. That is, the deepening area S is not limited to the opposite two sides of the uneven surface 11, and the design can be adjusted according to the requirements.
[0045] In a further optional embodiment, the depth of the concave-convex structure at the deepening region S gradually increases along the direction from the inside to the edge of the photovoltaic glass 10. It should be noted that the "inside" and "outside" relationship mentioned in this embodiment is determined based on the center of the photovoltaic glass 10; specifically, the center is the inside, and the edge is the outside.
[0046] In this embodiment, the direction is from the inside to the edge, which is also from the inside to the outside. As can be seen from the above, the depth of the concave-convex structure at the edge position (deepened area S) of the concave-convex surface 11 is somewhat deeper than the depth of the concave-convex structure at the middle position (non-deepened area).
[0047] Figure 2 This is a schematic diagram of a photovoltaic module according to one embodiment of this application.
[0048] In some embodiments, the concave-convex structure at the deepened region S employs a depth gradient design, which can be linear or non-linear. Specifically, the depth of the concave-convex structure at the inner part of the deepened region S is slightly shallower than that at the outer part, ensuring a better transition in depth from the shallower middle section to the deeper edge section. Furthermore, the outerer the concave-convex structure at the deepened region S, the deeper it becomes, resulting in a larger bonding area and higher adhesive force, ensuring that the thinner edges of the photovoltaic module are less prone to delamination.
[0049] It should be noted that the depth of the concave-convex structure at the deepened zone S does not necessarily adopt a gradual design; that is, the depth of the concave-convex structure at the deepened zone S can remain constant. Regardless of whether the depth of the concave-convex structure at the deepened zone S adopts a linear design, a non-linear design, or a constant depth design, it must ensure that the depth of the concave-convex structure at the deepened zone S is greater than the depth of the concave-convex structure in the non-deepened zone.
[0050] In some optional embodiments, the depth of the concave-convex structure at the deepened region S is 100 μm to 300 μm; further, the width of the deepened region S is 6 mm to 15 mm along the direction from the edge of the photovoltaic glass 10.
[0051] In some alternative embodiments, the depth of the convex-concave structure in the non-deepened region of the convex-concave surface 11 is 15 μm to 75 μm.
[0052] Furthermore, the average depth of the concave-convex structure at the deepened region S is 2-20 times the average depth of the concave-convex structure in the non-deepened region.
[0053] For example, the average depth of the concave-convex structure in the non-deepened region can be any one of 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, and 75μm, and the average depth of the concave-convex structure in the deepened region S can be any one of 100μm, 125μm, 150μm, 175μm, 200μm, 225μm, 250μm, 275μm, and 300μm.
[0054] In some embodiments, the width of the deepened region S can be any of 6mm, 9mm, 12mm, and 15mm.
[0055] To better understand this solution, please refer to the table below, which contains photovoltaic module testing data.
[0056] In existing technologies, conventional uneven structures typically have a depth of no more than 100μm, meaning there is no deepened area.
[0057] When the width of the deepened region S is 3mm, the reliability test DH1000 can significantly improve the delamination phenomenon. The occurrence of delamination is extremely rare and is acceptable depending on the specific situation, which proves that the existence of the deepened region can greatly improve the delamination phenomenon.
[0058] When the width of the deepened area S is ≥6mm, and the depth of the concave-convex structure at the deepened area S is 100-300μm, the effect is particularly outstanding, which can ensure that the component does not delaminate during reliability testing.
[0059] Specifically, the width of the deepened region S is preferably 10 mm, and the depth of the concave-convex structure at the deepened region S is 200 μm.
[0060]
[0061] Please see Figure 2 Another aspect of this application provides a photovoltaic module, which includes a front glass and an encapsulating film layer, wherein the front glass is the aforementioned photovoltaic glass 10, and the encapsulating film layer covers the deepened area S.
[0062] It should be noted that the bonding mentioned above refers to the bonding between the adhesive film layer and the photovoltaic glass 10. The adhesive film layer needs to cover the deepened area S to ensure the bonding effect.
[0063] In specific applications, the photovoltaic module also includes a backsheet 23, solar cells (not shown in the figure) and has a multi-layer stacked structure. The encapsulant layer is a composite encapsulant layer, specifically including a first film layer 21 and a second film layer 22. The backsheet 23, the first film layer 21, the solar cells, the second film layer 22 and the photovoltaic glass 10 are stacked. The first film layer 21 and the second film layer 22 are located between the concave and convex surfaces 11 and the backsheet 23.
[0064] The area of the backsheet 23, the first film layer 21 and the second film layer 22 in the photovoltaic module cannot be less than the area of the concave-convex surface 11. That is, the first film layer 21 and the second film layer 22 can at least cover the concave-convex surface 11, and the outer edge of the concave-convex surface 11 can be covered by the adhesive film layer. Only in this way can the adhesion effect between the backsheet 23 and the photovoltaic glass 10 at the thinner edge of the deepened area S be ensured.
[0065] It should be noted that before the lamination process, the area of the first film layer 21 and the second film layer 22 is smaller than the area of the uneven surface 11. After the lamination process, the first film layer 21 and the second film layer 22 extend, thus covering the uneven surface 11.
[0066] In some embodiments, both the first film layer 21 and the second film layer 22 are polymer material layers. For example, the first film layer 21 may be a polyolefin elastic material layer (POE), and the second film layer 22 may be an ethylene-vinyl acetate copolymer material layer (EVA), etc.
[0067] In some embodiments, the backplate 23 is made of a material with good durability, anti-aging properties and electrical insulation.
[0068] In some embodiments, the photovoltaic glass 10 is coated tempered glass, wherein the coated side is the opposite side of the concave-convex surface 11.
[0069] In some embodiments, preferably, the photovoltaic module is a single-glass module. Of course, it is not limited to this. The photovoltaic module can also be a double-glass module. A single-glass module with the photovoltaic glass 10 has a more significant anti-delamination effect.
[0070] The components of this application also include a frame, and in some embodiments, a conventional frame or a dust-proof frame is used, that is, the glass of this application is suitable for both dust-proof and non-dust-proof products. Figure 2 The diagram shows a module product using an anti-dust frame 30, which does not cover the upper surface of the glass, thus preventing dust accumulation at the edges of the photovoltaic module.
[0071] In the description of this application, features specified with "first" or "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features specified with "first" or "second" may explicitly or implicitly include at least one of the specified features. The use of the term "multiple" generally means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0072] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A photovoltaic glass, wherein the photovoltaic glass has a concave-convex structure, the concave-convex structure covering one side surface of the photovoltaic glass and forming a concave-convex surface; characterized in that, The concave-convex structure has a deepened area located at the edge of the concave-convex surface. The concave-convex structure is not deepened except for the deepened area. The minimum depth of the concave-convex structure in the deepened area is greater than the maximum depth of the concave-convex structure in the non-deepened area.
2. The photovoltaic glass according to claim 1, characterized in that, Along a direction perpendicular to the edge of the photovoltaic glass, the width of the deepened area is 6 mm to 15 mm.
3. The photovoltaic glass according to claim 2, characterized in that, The depth of the concave-convex structure in the deepened region is 100μm to 300μm.
4. The photovoltaic glass according to claim 1, characterized in that, The depth of the concave-convex structure in the non-deepened region is 15 μm to 75 μm.
5. The photovoltaic glass according to any one of claims 1-4, characterized in that, The average depth of the concave-convex structure in the deepened area is 2-20 times the average depth of the concave-convex structure in the non-deepened area.
6. The photovoltaic glass according to any one of claims 1-4, characterized in that, The deepened area is located on the two opposite edges of the concave and convex surfaces along the length direction of the photovoltaic glass and / or on the two opposite edges along the width direction of the photovoltaic glass.
7. The photovoltaic glass according to any one of claims 1-4, characterized in that, The depth of the concave-convex structure in the deepened area gradually increases along the direction from the inside to the edge of the photovoltaic glass.
8. The photovoltaic glass according to any one of claims 1-4, characterized in that, The cross-sectional shape of the concave-convex structure along the direction perpendicular to the photovoltaic glass plane is at least one of wavy, sawtooth, and polygonal.
9. A photovoltaic module, characterized in that, It includes a front glass and an encapsulating film layer, wherein the front glass is photovoltaic glass according to any one of claims 1 to 8; the encapsulating film layer covers at least a portion of the deepened area.
10. The photovoltaic module according to claim 9, characterized in that, The photovoltaic module is a single-glass module.