Photovoltaic module

Abstract

The utility model relates to a photovoltaic module which comprises front glass, back glass and a packaging adhesive film located between the front glass and the back glass, grooves are formed in the periphery of one of the front glass and the back glass, the other one of the front glass and the back glass is provided with protruding parts corresponding to the grooves, and the front glass and the back glass are oppositely combined. The groove and the protruding part are opposite in the thickness direction of the photovoltaic module, and the periphery of the packaging adhesive film is clamped between the groove and the protruding part. According to the photovoltaic module, the periphery of the packaging adhesive film is clamped and shaped into a shape with uneven surfaces by using the grooves and the protrusions, so that the bonding stability between the packaging adhesive film and the front glass and the back glass is enhanced, the sealing performance of the photovoltaic module is improved, a path for water vapor to permeate into the photovoltaic module is lengthened through the grooves, and the sealing performance of the photovoltaic module is improved. Therefore, the water vapor permeation and entry difficulty is increased, and the probability of adverse effects on the photovoltaic module caused by acetic acid generated by hydrolysis of the packaging adhesive film due to water vapor permeation and entry into the photovoltaic module is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic technology, and particularly relates to a photovoltaic module. Background Art

[0002] The reliability of a photovoltaic module is related to the service life of the module. Among them, the photovoltaic module is extremely sensitive to water vapor penetration. The mainstream manufacturing process of photovoltaic modules adopts single-glass and double-glass modules. Single-glass is prone to poor water vapor penetration. Compared with single-glass modules, double-glass modules have better waterproof performance.

[0003] In related technologies, a double-glass module is formed by combining two upper and lower glasses, and encapsulation films such as EVA (ethylene-vinyl acetate copolymer) film, POE (polyolefin elastomer) film, and co-extruded EPE film (a three-layer composite of EVA film - POE film - EVA film manufactured by a co-extrusion process) are added in the middle, and is prepared through processes such as lamination, framing, and installation of a junction box. Among them, the vinyl acetate group contained in the EVA material adopted by the EVA film is hydrophilic. After water vapor enters the edge of the module, the EVA material is prone to hydrolysis to produce acetic acid. The acetic acid reacts with the glass to generate a large amount of free sodium ions. The sodium ions on the glass surface migrate to the surface of the photovoltaic module through the encapsulation material, and will react with the grid lines on the surface of the photovoltaic module, resulting in an increase in series resistance and a decline in the performance of the photovoltaic module, which has an adverse effect on the reliability of the photovoltaic module. Summary of the Invention

[0004] Based on this, a photovoltaic module is provided to solve the technical problem that water vapor penetration into the photovoltaic module has an adverse effect on the reliability of the photovoltaic module.

[0005] The present application provides a photovoltaic module, including a front glass, a back glass, and an encapsulation film located between the front glass and the back glass. One of the front glass and the back glass is provided with a groove around its perimeter, and the other is provided with a protrusion corresponding to the groove. The front glass and the back glass are combined with each other, the groove and the protrusion are opposite in the thickness direction of the photovoltaic module, and the perimeter of the encapsulation film is clamped between the groove and the protrusion.

[0006] In one embodiment, the edge of the front glass is aligned with the edge of the back glass, the distance between the groove and the edge of the front glass is 1 mm to 3 mm, and / or the distance between the protrusion and the edge of the back glass is 1 mm to 3 mm.

[0007] In one embodiment, the width of the groove is 2 mm to 9 mm, and the width of the protrusion is equal to the width of the groove.

[0008] In one embodiment, the cross-sectional shape of the groove and the cross-sectional shape of the protrusion are both serrated, and the tooth crest on the protrusion is aligned with the tooth valley in the groove.

[0009] In one embodiment, the cross-sectional shape of the groove and the cross-sectional shape of the protrusion are both wavy, and the wave crest on the protrusion is aligned with the wave valley in the groove.

[0010] In one embodiment, the cross-sectional shape of the groove and the cross-sectional shape of the protrusion are both stepped, and the height change trend of the protrusion is consistent with the depth change trend of the groove.

[0011] In one embodiment, the protruding height of the stepped surface of the protrusion is equal to the recessed depth of the stepped surface opposite in the groove.

[0012] In one embodiment, the groove and the protrusion can cooperate to align and position the front glass and the back glass.

[0013] In one embodiment, the groove is further used to accommodate the glue material overflowing from the encapsulation adhesive film during the lamination process.

[0014] In one embodiment, the photovoltaic module further includes a frame, the frame has a buckle, the edges of the front glass and the back glass are clamped in the buckle, a groove is formed on the outer side of the front glass and / or the back glass, when sealant is filled in the buckle, the sealant fills into the groove and connects the front glass and the back glass to the buckle.

[0015] For the above-mentioned photovoltaic module, when the front glass and the back glass are aligned with each other, the groove and the protrusion clamp the periphery of the encapsulation adhesive film, and the periphery of the encapsulation adhesive film is clamped and shaped into a shape with uneven surface by the groove and the protrusion, so as to enhance the bonding stability between the encapsulation adhesive film and the front glass and the back glass and improve the sealing performance of the photovoltaic module. Moreover, the uneven surface of the groove and the protrusion lengthens the path for water vapor to penetrate into the interior of the photovoltaic module, thereby increasing the difficulty of water vapor penetration, and then being beneficial to reducing the probability of adverse effects on the photovoltaic module caused by hydrolysis of the encapsulation adhesive film due to water vapor penetration into the photovoltaic module to produce acetic acid. Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the accompanying drawings required for the description of the embodiments or related technologies. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a photovoltaic module according to an embodiment of the present application.

[0018] Figure 2 It is a partial structural schematic diagram of the front glass and the back glass in a photovoltaic module according to an embodiment of the present application.

[0019] Figure 3 It is a front view schematic diagram of the side with grooves opened on the front glass in a photovoltaic module according to an embodiment of the present application.

[0020] Figure 4 It is Figure 3 A partial enlarged structural schematic diagram of the front glass in the photovoltaic module shown in at A.

[0021] Figure 5 It is Figure 4 A schematic cross-sectional structure diagram along the I-I line in .

[0022] Figure 6 It is a front view schematic diagram of the side with protrusions provided on the back glass in a photovoltaic module according to an embodiment of the present application.

[0023] Figure 7 It is Figure 6 A partial enlarged structural schematic diagram of the back glass in the photovoltaic module shown in at B.

[0024] Figure 8 It is Figure 7 A schematic cross-sectional structure diagram along the II-II line in .

[0025] Figure 9 It is a partial structural schematic diagram of the front glass and the back glass in a photovoltaic module according to another embodiment of the present application.

[0026] Figure 10 It is a schematic structural diagram of a photovoltaic module according to another embodiment of the present application.

[0027] Figure 11 It is a partial structural schematic diagram of the front glass and the back glass in a photovoltaic module according to still another embodiment of the present application.

[0028] Figure 12 It is a schematic structural diagram of a photovoltaic module according to still another embodiment of the present application.

[0029] Description of the reference numerals in the drawings:

[0030] 10. Photovoltaic module; 11. Front glass; 11a. Groove; 11b. First stepped surface; 12. Rear glass; 12a. Protrusion; 12b. Second stepped surface; 13. Encapsulation film; 14. Frame; 14a. Snap; 15. Sealant. Detailed implementation manners

[0031] In order to make the above objects, features and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0033] The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are only for the purpose of illustration and do not represent the only implementation manner.

[0034] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0035] In the implementation manners of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0036] Combined with Figure 1 and Figure 2As shown in the figure, a photovoltaic module 10 provided by an embodiment of the present application includes a front glass 11, a back glass 12, and an encapsulation adhesive film 13 located between the front glass 11 and the back glass 12. A groove 11a is provided around one of the front glass 11 and the back glass 12, and a protrusion 12a corresponding to the groove 11a is provided on the other one.

[0037] Specifically, as shown in Figures 3 to 5 the figure, a groove 11a is formed by the depression at the peripheral positions of the front glass 11. As shown in Figures 6 to 8 the figure, a protrusion 12a is formed by the protrusion at the peripheral positions of the back glass 12. Correspondingly, in some embodiments, a protrusion 12a is formed by the protrusion at the peripheral positions of the front glass 11, and a groove 11a is formed by the depression at the peripheral positions of the back glass 12.

[0038] In this embodiment, as shown in Figure 1 the figure, the front glass 11 and the back glass 12 are mutually opposed, the groove 11a and the protrusion 12a are opposite in the thickness direction of the photovoltaic module 10, and the periphery of the encapsulation adhesive film 13 is clamped between the groove 11a and the protrusion 12a. Thus, the periphery of the encapsulation adhesive film 13 is clamped and shaped into a shape with uneven surface by the groove 11a and the protrusion 12a, so as to enhance the bonding stability between the encapsulation adhesive film 13 and the front glass 11 and the back glass 12, and improve the sealing performance of the photovoltaic module 10. Compared with the related art in which a flat glass is used to clamp the encapsulation adhesive film 13, in the photovoltaic module 10 of the present application, when the front glass 11 and the back glass 12 are mutually opposed, the groove 11a and the protrusion 12a clamp the periphery of the encapsulation adhesive film 13, and the uneven surface of the groove 11a and the protrusion 12a lengthens the path for water vapor to penetrate into the interior of the photovoltaic module 10, thereby increasing the difficulty of water vapor penetration, and then being beneficial to reducing the probability of adverse effects on the photovoltaic module 10 caused by hydrolysis of the encapsulation adhesive film 13 to produce acetic acid due to water vapor penetration into the photovoltaic module 10.

[0039] For the convenience of description, the structure of the photovoltaic module 10 will be further described below by taking the groove 11a formed on the front glass 11 and the protrusion 12a formed on the back glass 12 as an example.

[0040] In some embodiments, the edge of the front glass 11 is aligned with the edge of the back glass 12. As shown in Figure 5As shown, the distance d1 between the groove 11a and the edge of the front glass 11 is 1 mm to 3 mm. Specifically, d1 can take values of 1 mm, 2 mm, or 3 mm, and is not limited herein. The width W of the groove 11a is 2 mm to 9 mm. The width of the groove 11a refers to the distance from the outer edge to the inner edge of the grooved area. Specifically, the width W of the groove 11a can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, or 9 mm. It should be noted that the width of the protrusion 12a is equal to the width of the groove 11a, which is beneficial to improving the stability of clamping the four sides of the encapsulation film 13 and enhancing the sealing performance of the edge of the photovoltaic module 10.

[0041] Combined with Figure 8 As shown, the distance d2 between the protrusion 12a and the edge of the back glass 12 is 1 mm to 3 mm. Specifically, d2 can take values of 1 mm, 2 mm, or 3 mm, and is not limited herein.

[0042] Regarding the cross-sectional shapes of the groove 11a and the protrusion 12a, they can be serrated or wavy, or can also be stepped. The cross-sectional shape of the protrusion 12a is a complementary shape to the cross-sectional shape of the groove 11a.

[0043] For the convenience of understanding below, the structure of the photovoltaic module 10 will be further described in combination with the cross-sectional shape of the groove 11a respectively, but the cross-sectional shape of the groove 11a is not limited thereto.

[0044] Combined with Figure 5 And Figure 8 As shown, the cross-sectional shape of the groove 11a is serrated. Correspondingly, the cross-sectional shape of the protrusion 12a corresponding to the groove 11a is also serrated. As Figure 1 shown, when the front glass 11 and the back glass 12 are joined together, the tooth peaks on the protrusion 12a are aligned with the tooth valleys in the groove 11a, so that there is enough clearance between the groove 11a and the protrusion 12a, which is beneficial to stably clamping the four sides of the encapsulation film 13 between the groove 11a and the protrusion 12a.

[0045] Combined with Figure 9 And Figure 10 As shown, in some embodiments, the cross-sectional shape of the groove 11a is wavy. Correspondingly, the cross-sectional shape of the protrusion 12a corresponding to the groove 11a is also wavy. In this embodiment, the wave peaks on the protrusion 12a are aligned with the wave valleys in the groove 11a, so that there is enough clearance between the groove 11a and the protrusion 12a, which is beneficial to stably clamping the four sides of the encapsulation film 13 between the groove 11a and the protrusion 12a.

[0046] Combined with Figure 11 And Figure 12As shown, in some embodiments, the cross-sectional shape of the groove 11a is stepped, so that when the front glass 11 and the back glass 12 are joined, connection points can be provided at each step of the groove 11a, enhancing the assembly stability between the front glass 11 and the back glass 12. In addition, under this structural design, the groove 11a can increase the water vapor penetration path to increase the difficulty of water vapor penetration, thereby reducing the probability of water vapor penetrating into the photovoltaic module 10, and then ensuring the reliability of the photovoltaic module 10.

[0047] It should be noted that the height change trend of the protrusion 12a is consistent with the depth change trend of the groove 11a. Specifically, since the cross-sectional shape of the groove 11a is stepped, the cross-sectional shape of the protrusion 12a is also stepped. When the depth of the groove 11a gradually increases from the outside to the inside of the front glass 11, the protrusion height of each stepped surface of the protrusion 12a gradually increases from the outside to the inside of the back glass 12; when the depth of the groove 11a gradually decreases from the outside to the inside of the glass, the protrusion height of each stepped surface of the protrusion 12a gradually decreases from the outside to the inside of the glass. The number of steps of the protrusion 12a is equal to the number of steps in the groove 11a and they are in one-to-one correspondence.

[0048] Furthermore, the protrusion height h2 of the stepped surface of the protrusion 12a (such as Figure 12 the second stepped surface 12b) is equal to the depression depth h1 of the stepped surface (such as Figure 12 the first stepped surface 11b) opposite to the second stepped surface 12b in the groove 11a. Thus, the compression amount of the encapsulation film 13 clamped between the groove 11a and the protrusion 12a is consistent at the corresponding stepped surfaces, which is beneficial to maintaining the thickness consistency of the encapsulation film 13 and reducing the phenomenon of being locally thin and the material being fragile.

[0049] It should be noted that the shape of the groove 11a is not limited to a sawtooth shape, a wavy shape or a stepped shape. Based on the inventive concept of reducing water vapor penetration by optimizing the structural design of the front glass 11 and the back glass 12 in the present invention, other structures can also be used to achieve the purpose of the present invention. For example, the groove 11a is a horizontal S-shaped groove 11a.

[0050] In some embodiments, the groove wall of the groove 11a has a micro-concave-convex structure to increase the surface roughness of the groove wall of the groove 11a. By designing the size and quantity of the concave-convex structure, the surface roughness of the groove wall of the groove 11a can be set at an appropriate level.

[0051] In the embodiments of the present application, the groove 11a is not limited to blocking water vapor penetration, and the groove 11a can also be used as a positioning groove or an overflow glue groove.

[0052] For example, in some embodiments, when the groove 11a serves as a positioning groove, it can play a positioning effect on the alignment of the front glass 11 and the back glass 12. Specifically, the groove 11a and the protrusion 12a cooperate to align and position the front glass 11 and the back glass 12. When the front glass 11 and the back glass 12 are aligned, the cooperation between the groove 11a and the protrusion 12a is used to make the front glass 11 and the back glass 12 fit well, so as to realize the positioning of the front glass 11 and the back glass 12, effectively preventing the encapsulation adhesive film 13 from melting, flowing or shifting during the lamination process, resulting in misalignment of the front glass 11 and the back glass 12.

[0053] Again, for example, in some embodiments, the groove 11a is also used to accommodate the glue overflowed from the encapsulation adhesive film 13 during the lamination process. Specifically, during the lamination of the encapsulation adhesive film 13, the groove 11a can serve as an overflow groove to relieve the overflow of glue by accommodating the glue. In the related art, in the case where the front glass 11 and the back glass 12 are not provided with an overflow groove, when the encapsulation adhesive film 13 melts during the lamination process, there will be excess glue flowing out from between the front glass 11 and the back glass 12 to the outside to form glue overflow. Since in the photovoltaic module 10 of the embodiment of the present application, one of the front glass 11 and the back glass 12 is provided with the groove 11a, when the excess glue flows through the groove 11a, the groove 11a can accommodate the glue, thus effectively relieving the glue overflow phenomenon.

[0054] Refer again to Figure 1 As shown, the photovoltaic module 10 further includes a frame 14, and the frame 14 has a buckle 14a, and the edges of the front glass 11 and the back glass 12 are clamped in the buckle 14a. In some embodiments, by filling the buckle 14a with sealant 15, the front glass 11 and the back glass 12 are stably fixed in the buckle 14a of the frame 14 with glue, so as to improve the stability of the overall photovoltaic module 10 by using the frame 14, and it is convenient to install the photovoltaic module 10 at a place where photovoltaic power generation is required.

[0055] A groove (not shown in the figure) can be opened on the outer side of the front glass 11 and / or the back glass 12, so that when the sealant 15 is filled in the buckle 14a, the glue will fill into the groove, thereby forming a good sealant 15 effect between the front glass 11 and the back glass 12 and the buckle 14a of the frame 14, and further improving the sealing performance of the photovoltaic module 10.

[0056] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0057] The above embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A photovoltaic module (10), characterized in that: The photovoltaic module (10) comprises a front glass (11), a back glass (12), and a packaging film (13) located between the front glass (11) and the back glass (12); one of the front glass (11) and the back glass (12) is provided with a groove (11a) on its periphery, and the other is provided with a protrusion (12a) corresponding to the groove (11a); the front glass (11) and the back glass (12) are aligned with each other, the groove (11a) and the protrusion (12a) are opposite in the thickness direction of the photovoltaic module (10), and the packaging film (13) is sandwiched between the groove (11a) and the protrusion (12a) on its periphery.

2. The photovoltaic assembly (10) according to claim 1, characterized in that: The edge of the front glass (11) is aligned with the edge of the back glass (12), the distance between the groove (11a) and the edge of the front glass (11) is 1 mm to 3 mm, and / or the distance between the protrusion (12a) and the edge of the back glass (12) is 1 mm to 3 mm.

3. The photovoltaic assembly (10) according to claim 1 or 2, characterized in that: The width of the groove (11a) is 2 mm to 9 mm, and the width of the protrusion (12a) is equal to the width of the groove (11a).

4. The photovoltaic assembly (10) according to claim 1, characterized in that: The cross-sectional shape of the groove (11a) and the cross-sectional shape of the protrusion (12a) are both sawtooth-shaped, and the tooth peaks on the protrusion (12a) are directly opposite to the tooth valleys in the groove (11a).

5. The photovoltaic assembly (10) according to claim 1, characterized in that: The cross-sectional shape of the groove (11a) and the cross-sectional shape of the protrusion (12a) are both wave-shaped, and the wave crest on the protrusion (12a) is directly opposite to the wave trough in the groove (11a).

6. The photovoltaic assembly (10) according to claim 1, characterized in that: The cross-sectional shape of the groove (11a) and the cross-sectional shape of the protrusion (12a) are both stepped, and the height variation trend of the protrusion (12a) is consistent with the depth variation trend of the groove (11a).

7. The photovoltaic assembly (10) according to claim 6, characterized in that: The protruding height of the step surface of the protruding portion (12a) is equal to the recessed depth of the step surface directly facing the groove (11a).

8. The photovoltaic assembly (10) according to claim 1, characterized in that: The groove (11a) cooperates with the protrusion (12a) to align and position the front glass (11) and the back glass (12).

9. The photovoltaic assembly (10) according to claim 1, characterized in that: The groove (11a) is also used to receive the adhesive material overflowing from the packaging adhesive film (13) during the lamination process.

10. The photovoltaic assembly (10) according to claim 1, characterized in that: The invention also comprises a frame (14), wherein the frame (14) has a buckle (14a), and the edges of the front glass (11) and the back glass (12) are buckled in the buckle (14a). A groove is provided on the outer side of the front glass (11) and / or the back glass (12). When the buckle (14a) is filled with a sealing glue (15), the sealing glue (15) is filled into the groove and connects the front glass (11) and the back glass (12) to the buckle (14a).

Images