Low-water-permeability packaging photovoltaic module structure

Abstract

The utility model discloses a low-water-permeability packaging photovoltaic module structure, and the structure comprises first glass which is opposite to second glass in the thickness direction; the battery accommodating cavity is clamped between the first glass and the second glass; the sealing edge is an edge where the first glass and the second glass are attached and is arranged on the peripheral side of the battery accommodating cavity in a surrounding manner; and the packaging structure covers the end gap surface, far away from the battery accommodating cavity, of the sealing edge, and comprises a waterproof adhesive tape and high-temperature-resistant waterproof glue which are sequentially close to the end gap surface. The low-water-permeability packaged photovoltaic module is reasonable in structure, and the high-temperature-resistant waterproof glue is coated on the end gap surface of the sealing edge, so that the low-water-permeability packaged photovoltaic module is good in sealing effect, bonding strength and aging resistance, and simple and convenient in operation process; and then the high-temperature-resistant waterproof glue is extruded by the waterproof adhesive tape to slightly deform and is tightly attached to the end gap face, the binding force is enhanced, and the dual-sealing waterproof effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic module packaging, in particular to a low water permeability packaged photovoltaic module structure. Background Art

[0002] A photovoltaic module is a component that generates electricity using the photovoltaic effect, usually composed of solar cells, encapsulant film, glass, and a cover plate. Among them, heterojunction cell packaging requires waterproofing and is relatively sensitive to moisture. In the prior art, Method 1: Butyl glue is coated around the front glass, and then laminated with the back glass to achieve the effect of waterproof sealing. However, it has the following disadvantages: The accuracy of butyl glue coating around the perimeter is difficult to control, and there is a lot of butyl glue overflow after lamination, which is difficult to clean up, increasing the labor intensity; The encapsulant film laid inside the module needs to be precisely cut to prevent overlap with the butyl glue around the perimeter, so as not to damage the sealing performance of the butyl glue on the module. Method 2: After laminating and trimming the edges of the photovoltaic module, a layer of aluminum foil waterproof tape is wrapped for sealing. However, it has the following disadvantages: After high temperature and high humidity, the adhesive strength of the tape decreases, resulting in the tape falling off and losing the sealing effect.

[0003] Therefore, it is necessary to improve the packaged photovoltaic module structure in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects existing in the prior art, and provide a low water permeability packaged photovoltaic module structure. By coating the end gap surface of the sealing edge with a high-temperature resistant waterproof glue, not only the sealing effect is good, the bonding strength and aging resistance are good, but also the operation process is simple; Then, the waterproof tape squeezes the high-temperature resistant waterproof glue to cause micro-deformation, which fits tightly with the end gap surface, enhancing the bonding force and playing a dual role of sealing and waterproofing.

[0005] To achieve the above technical effects, the technical solution of the utility model is: A low water permeability packaged photovoltaic module structure, comprising:

[0006] A first glass, disposed opposite to a second glass along the thickness direction;

[0007] A battery accommodating cavity, clamped between the first glass and the second glass;

[0008] A sealing edge, which is the edge where the first glass and the second glass are in contact, surrounding the periphery of the battery accommodating cavity;

[0009] A packaging structure, covering the end gap surface of the sealing edge away from the battery accommodating cavity, including a waterproof tape and a high-temperature resistant waterproof glue successively close to the end gap surface.

[0010] A preferred technical solution is that the high-temperature resistant waterproof glue is in concave-convex fit with the end gap surface.

[0011] Preferably, the projected area of the high-temperature resistant waterproof adhesive on the end gap surface is equal to or larger than the area of the end gap surface.

[0012] Preferably, a groove is provided between the first glass and the second glass, and the groove side surfaces are arranged oppositely along the glass thickness direction.

[0013] Preferably, the cross-section of the end gap surface gradually decreases along the glass width extension direction.

[0014] Preferably, the waterproof tape is wrapped around the convex surface of the high-temperature resistant waterproof adhesive and bonded to the first glass and the second glass.

[0015] Preferably, the waterproof tape is provided with a bifurcated edge, and the bifurcated edges are cross-laid at the corners of the sealing edge.

[0016] Preferably, the waterproof tape includes a barrier layer, a waterproof layer, a waterproof adhesive layer, and a release film laminated in sequence along the adhesive thickness direction.

[0017] Preferably, the barrier layer is one of a polyethylene co-extruded film, a PET composite film, a TPU composite film, and a PVDF adhesive; the waterproof layer is an aluminized layer; and the material of the waterproof adhesive layer is a polyurethane-modified acrylic adhesive.

[0018] Preferably, the material of the high-temperature resistant waterproof adhesive is a hot melt adhesive and a butyl adhesive.

[0019] The advantages and beneficial effects of the present utility model are as follows:

[0020] The low-water-permeability encapsulated photovoltaic module has a reasonable structure. By applying the high-temperature resistant waterproof adhesive to the end gap surface of the sealing edge, not only the sealing effect is good, the bonding strength and the aging resistance are good, but also the operation process is simple; and then, by extruding the high-temperature resistant waterproof adhesive with the waterproof tape to cause micro-deformation, the waterproof tape fits tightly with the end gap surface, the bonding force is enhanced, and the dual sealing and waterproof functions are exerted. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the high-temperature adhesive sealing in Embodiment 1 of the low-water-permeability encapsulated photovoltaic module structure of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the combined sealing of the waterproof tape and the high-temperature adhesive in Embodiment 1;

[0023] Figure 3 is a partial schematic diagram at the corner of the sealing edge in Embodiment 1;

[0024] Figure 4 is a schematic diagram of the layer structure before the release film of the waterproof tape is peeled off;

[0025] Figure 5 It is a schematic structural diagram of Embodiment 2 of the structure of the low-water-permeability encapsulated photovoltaic module of the present utility model.

[0026] In the figure: 1. First glass; 2. Second glass; 3. Sealing edge; 4. Encapsulation structure; 10. Outer surface; 30. Groove; 31. End gap surface; 40. High-temperature resistant waterproof glue; 41. Waterproof tape; 100. Battery accommodation cavity; 411. Barrier layer; 412. Waterproof layer; 413. Waterproof glue layer; 414. Release film. Specific embodiments

[0027] The following combines the drawings and embodiments to further describe the specific embodiments of the present utility model. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model, and cannot be used to limit the protection scope of the present utility model.

[0028] "End" is referenced to the normal use state of the low-water-permeability encapsulated photovoltaic module structure, and is only for the convenience of describing the present utility model 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 utility model.

[0029] In addition, terms such as "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present inventive concept, unless otherwise stated, the meaning of "a plurality" is two or more.

[0030] As Figures 1 to 5 shown, the low-water-permeability encapsulated photovoltaic module structure disclosed by the present utility model includes a first glass 1, a second glass 2, a battery accommodation cavity 100, a sealing edge 3 and an encapsulation structure 4. The first glass 1 is disposed opposite to the second glass 2 along the thickness direction, and the battery accommodation cavity 100 is clamped between the first glass 1 and the second glass 2; the sealing edge 3 is the edge where the first glass 1 and the second glass 2 are attached, and surrounds the periphery of the battery accommodation cavity 100; the encapsulation structure 4 is coated on the end gap surface 31 of the sealing edge 3 away from the battery accommodation cavity 100, and includes a waterproof tape 41 and a high-temperature resistant waterproof glue 40 that are successively close to the end gap surface 31.

[0031] The end gap surface 31 of the sealing edge 3 is coated with a high-temperature resistant waterproof adhesive 40. This not only provides a good sealing effect, but also has good bonding strength and aging resistance, and the operation process is simple. Then, a waterproof tape 41 is used to extrude the high-temperature resistant waterproof adhesive 40 to cause slight deformation, so that it fits closely with the end gap surface 31, enhancing the bonding force and playing a dual role in sealing and waterproofing. Further, the thickness of the high-temperature resistant waterproof adhesive 40 is 0.5 - 1 mm. The high-temperature resistant waterproof adhesive needs to meet a water vapor transmission rate of 0.3 g / m 2 .day or less.

[0032] The high-temperature resistant waterproof adhesive 40 fits with the uneven end gap surface 31. A groove 30 is provided between the first glass 1 and the second glass 2. The groove sides of the groove 30 are arranged opposite to each other along the glass thickness direction, that is, the groove length of the groove 30 extends along the glass length direction or the width direction. The coating process steps of the high-temperature resistant waterproof adhesive are as follows: stack and install in the order of the first glass, the adhesive film, the photovoltaic cell element, the adhesive film, and the second glass. The preliminarily installed photovoltaic module is placed flat, and a sealing process is carried out. The gluing machine moves in a circular motion along the edge of the sealing edge, that is, moves along an alternating path in the glass length direction and the width direction. Due to the groove 30 with groove sides arranged opposite to each other along the glass thickness direction, not only does it increase the contact area between the high-temperature resistant waterproof adhesive 40 and the end gap surface 31, but also after the high-temperature resistant waterproof adhesive 40 is cured and formed, the adhesive side opposite to the end gap surface 31 along the adhesive thickness is flat, making it easy to paste the waterproof tape. Also, because the extension direction of the groove 30 is consistent with the moving path of the gluing machine, the glue liquid before curing flows along the groove 30, not only ensuring smooth gluing, but also facilitating the gluing of the corners of the sealing edge 3 in place and evenly. The groove 30 is arranged along the glass thickness direction in a consistent manner or at an acute angle. This can also increase the contact area between the high-temperature resistant waterproof adhesive and the end gap surface. If the gluing at the corners of the sealing edge is not smooth, the glue liquid is likely to overflow from the groove port to the outer surfaces 10 of the first glass 1 and the second glass 2, making the adhesive edge of the high-temperature resistant waterproof adhesive 40 uneven. When pasting the waterproof tape 41, there will be wrinkles and irregular protrusions on the glue surface, which not only affects the aesthetics but also is not conducive to the subsequent installation of the frame.

[0033] The cross-section of the end gap surface 31 gradually decreases along the glass width extension direction. The cross-section of the groove 30 is an isosceles trapezoid or a triangle. The groove 30 can be set individually or in multiple numbers. In order for the adhesive edge of the high-temperature resistant waterproof adhesive 40 to extend to the outer surfaces 10 of the first glass 1 and the second glass 2, which is beneficial to the tightness and firmness of the coating, improving the sealing effect and bonding force, the edges of the outer surfaces 10 of the first glass 1 and the second glass 2 are beveled, and the cross-section of the groove 30 can also be set in a U shape.

[0034] To optimize the sealing structure of the end gap surface 31, the projected area of the high-temperature resistant waterproof adhesive 40 on the end gap surface 31 is equal to or greater than the area of the end gap surface 31.

[0035] In order to achieve a double waterproof sealing effect and improve the stability of the sealing structure, the waterproof tape 41 is disposed on the convex surface of the high-temperature resistant waterproof glue 40 and adhered to the first glass 1 and the second glass 2. To solve the problems of unevenness and poor sealing at the corners of the sealing edge, the waterproof tape is provided with a bifurcated edge (not marked), and the bifurcated edges are cross-laid at the corners of the sealing edge.

[0036] The waterproof tape 41 includes, along the glue thickness direction, a barrier layer 411, a waterproof layer 412, a waterproof glue layer 413, and a release film 414 that are sequentially laminated. Among them, the barrier layer 411 is one of a polyethylene co-extruded film, a PET composite film, a TPU composite film, and a PVDF glue; the waterproof layer 412 is an aluminized layer; the material of the waterproof glue layer 413 is a polyurethane-modified acrylic adhesive. In order to further improve the connection firmness between the waterproof layer 412 and the waterproof glue layer 413 and prevent delamination, an acrylic adhesive is also provided.

[0037] The aluminized layer can reflect most of the solar radiation, which helps to reduce heat absorption and is very helpful for improving the weather resistance of the tape and extending its service life; the aluminized layer can provide a barrier to prevent moisture from penetrating into the tape, thereby enhancing the overall waterproof performance of the tape; the aluminum layer can also increase the corrosion resistance of the tape, enabling it to be used in harsh environments; the aluminized layer increases the mechanical strength of the tape, helping to improve its durability and resistance to wear; the aluminized layer can also give the tape a metallic luster, making it look more beautiful. The aluminized layer is sandwiched between the barrier layer and the waterproof glue layer, effectively preventing the aluminized layer from oxidizing. Oxidation may cause cracks or holes in the aluminized layer, thereby reducing the waterproof performance of the tape; oxidation will cause the aluminum layer to lose its original corrosion protection ability, making the tape more vulnerable to corrosion.

[0038] The acrylic adhesive is modified by polyurethane to improve its temperature resistance, enabling the modified adhesive to withstand a wider temperature range. Generally, it can still maintain good bonding performance at lower and higher temperatures, broadening the application scenarios of photovoltaic modules; enhancing the initial adhesion force, which can quickly form an initial adhesion force during bonding, helping to immediately fix the bonded object and reducing the risk of sliding and movement; improving flexibility, the flexibility of the polyurethane molecular chain can endow the adhesive with better flexibility, making it perform better when bonding curved or irregular surfaces and also maintaining good bonding effect under dynamic loads; enhancing weather resistance and durability, being able to maintain the bonding strength in outdoor environments for a long time and reducing the performance degradation caused by factors such as ultraviolet radiation and temperature changes; increasing the bonding strength; improving water resistance and moisture resistance, still maintaining good bonding performance after being soaked in water, suitable for waterproof application occasions; improving chemical resistance; enhancing impact resistance, which can strengthen the impact resistance of the adhesive and make it not easily break when subjected to external force impact; increasing oil resistance and solvent resistance, being able to remain stable when in contact with oils and solvents and not losing the bonding performance due to the presence of these substances.

[0039] Example 1

[0040] As Figures 1 to 4 shown, the low water-permeable encapsulated photovoltaic module structure of Example 1 includes a first glass 1, a second glass 2, a battery accommodation cavity 100, a sealing edge 3, and an encapsulation structure 4. The first glass 1 is disposed opposite to the second glass 2 along the thickness direction, and the battery accommodation cavity 100 is clamped between the first glass 1 and the second glass 2; the sealing edge 3 is the edge where the first glass 1 and the second glass 2 are joined together, surrounding the periphery of the battery accommodation cavity 100; the encapsulation structure 4 covers the end gap surface 31 of the sealing edge 3 away from the battery accommodation cavity 100, and includes a waterproof tape 41 and a high-temperature resistant waterproof adhesive 40 that are successively close to the end gap surface 31.

[0041] The projected area of the high-temperature resistant waterproof adhesive 40 on the end gap surface 31 is larger than the area of the end gap surface 31.

[0042] Among them, the waterproof tape 41 includes a barrier layer 411, a waterproof layer 412, a waterproof adhesive layer 413, and a release film 414 that are successively laminated along the adhesive thickness direction. The waterproof tape 41 is wrapped around the convex surface of the high-temperature resistant waterproof adhesive 40 and is bonded to the first glass 1 and the second glass 2. The waterproof tape is provided with a bifurcated edge (not marked), and the bifurcated edges are cross-laminated at the corners of the sealing edge.

[0043] Example 2

[0044] As Figure 5As shown, Embodiment 2 is based on Embodiment 1, the difference being that the high-temperature resistant waterproof glue 40 is in concave-convex fit with the end gap surface 31, a groove 30 is provided between the first glass 1 and the second glass 2, the groove sides of the groove 30 are oppositely arranged along the glass thickness direction, that is, the groove length of the groove 30 extends along the glass length direction or the width direction. The groove 30 is provided individually. The cross-section of the end gap surface 31 gradually decreases along the glass width extension direction, the cross-section of the groove 30 is triangular, and the edges of the outer surfaces 10 of the first glass 1 and the second glass 2 are beveled.

[0045] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A low water permeability encapsulated photovoltaic module structure, characterized in that: include: A first glass is arranged opposite to the second glass in a thickness direction; A battery receiving chamber, sandwiched between the first glass and the second glass; The sealing edge is the edge where the first glass and the second glass are bonded together and is arranged around the battery receiving cavity; The packaging structure is coated on the end gap surface of the sealing edge away from the battery accommodating cavity, and includes a waterproof tape and a high-temperature resistant waterproof glue which are adjacent to the end gap surface in sequence.

2. The low water permeability encapsulated photovoltaic module structure according to claim 1, characterized in that: The high temperature resistant waterproof glue is matched with the end gap surface in a concave-convex manner.

3. The low water permeability encapsulated photovoltaic module structure according to claim 1 or 2, characterized in that: The projection area of ​​the high temperature resistant waterproof glue on the end gap surface is equal to or greater than the area of ​​the end gap surface.

4. The low water permeability encapsulated photovoltaic module structure according to claim 2, characterized in that: A groove is arranged between the first glass and the second glass, and the groove sides of the groove are arranged opposite to each other along the thickness direction of the glass.

5. The low water permeability encapsulated photovoltaic module structure according to claim 2 or 4, characterized in that: The cross section of the end gap surface along the extending direction of the glass width gradually decreases.

6. The low water permeability encapsulated photovoltaic module structure according to claim 1, characterized in that: The waterproof tape is wrapped around the raised surface of the high temperature resistant waterproof adhesive and is bonded to the first glass and the second glass.

7. The low water permeability encapsulated photovoltaic module structure according to claim 6, characterized in that: The waterproof tape is provided with bifurcated edges, and the bifurcated edges are cross-stacked at the corners of the sealing edges.

8. The low water permeability encapsulated photovoltaic module structure according to claim 1 or 6, characterized in that: The waterproof adhesive tape comprises a barrier layer, a waterproof layer, a waterproof adhesive layer and a release film which are stacked in sequence along the adhesive thickness direction.

9. The low water permeability encapsulated photovoltaic module structure according to claim 8, characterized in that: The barrier layer is one of polyethylene co-extruded film, PET composite film, TPU composite film and PVDF adhesive; the waterproof layer is an aluminum-plated layer; the material of the waterproof adhesive layer is polyurethane modified acrylic adhesive.

10. The low water permeability encapsulated photovoltaic module structure according to claim 1, characterized in that: The material of the high temperature resistant waterproof adhesive is hot melt adhesive and butyl adhesive.

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