Composite layer and photovoltaic module

Abstract

The utility model relates to a composite layer and a photovoltaic assembly. Wherein the composite layer comprises a weather-proof layer and a bonding layer which are arranged in a stacked mode, the light transmittance of the weather-proof layer is larger than or equal to 80%, the yellowing index after aging treatment is smaller than 5.0, the light transmittance of the bonding layer is larger than or equal to 80%, the bonding strength is larger than or equal to 30 N / cm, and the yellowing index after aging treatment is smaller than 10.0. The composite layer has high light transmittance, high weather resistance and high adhesive property, so that the photovoltaic module prepared from the composite layer has the characteristics of simple structure, overall light weight, good weather resistance, high light transmittance and high reliability, the photoelectric conversion efficiency of the photovoltaic module is effectively improved, and the service life of the photovoltaic module is effectively prolonged.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, and in particular to composite layers and photovoltaic modules. Background Technology

[0002] Currently, conventional photovoltaic (PV) modules mainly consist of a backsheet and, sequentially, a film, a cell array, a glass fiber reinforcement material, and a transparent front film stacked on the surface of the backsheet. This stacking structure and lamination process are relatively complex, which to some extent affects product yield and production efficiency. Furthermore, the overall weight of PV modules remains relatively large. In addition, the film in conventional PV modules has poor weather resistance; under long-term outdoor use, the film is prone to aging, leading to separation between the backsheet and the film, thus affecting the lifespan and luminous efficiency of the PV module. Utility Model Content

[0003] Therefore, it is necessary to provide a composite layer and a photovoltaic module to address the aforementioned problems. This composite layer combines high light transmittance, high weather resistance, and high adhesion, enabling the photovoltaic module to have the characteristics of simple structure, lightweight, good weather resistance, high light transmittance, and high reliability, thereby effectively improving the photoelectric conversion efficiency and service life of the photovoltaic module.

[0004] A composite layer comprising a weather-resistant layer and an adhesive layer stacked together, wherein the light transmittance of the weather-resistant layer is ≥80%, and the yellowing index after aging treatment is <5.0; the light transmittance of the adhesive layer is ≥80%, the adhesive strength is ≥30N / cm, and the yellowing index after aging treatment is <10.0.

[0005] In one embodiment, the bonding strength of the weather-resistant layer is ≥30 N / cm;

[0006] And / or, the yellowing index of the adhesive layer after aging treatment is <5.0;

[0007] And / or, the bonding strength of the adhesive layer is ≥60 N / cm.

[0008] In one embodiment, the weather-resistant layer includes at least one weather-resistant sublayer, wherein the light transmittance of the weather-resistant sublayer is ≥80%, and the yellowing index after aging treatment is <5.0.

[0009] In one embodiment, the light transmittance of the weather-resistant sublayer is ≥85%;

[0010] And / or, the bonding strength of the weather-resistant sublayer is ≥30 N / cm;

[0011] And / or, the thickness of the weather-resistant sublayer is 0.05mm-1mm.

[0012] In one embodiment, the weather-resistant sublayer is a composite layer structure composed of a first reinforcing material and a first transparent resin, wherein the first reinforcing material is selected from glass fiber material.

[0013] In one embodiment, the adhesive layer includes at least one adhesive sublayer, wherein the light transmittance of the adhesive sublayer is ≥80%, the adhesive strength is ≥30N / cm, and the yellowing index after aging treatment is <10.0.

[0014] In one embodiment, the bonding strength of the adhesive sublayer is ≥60 N / cm;

[0015] And / or, the yellowing index of the adhesive sublayer after aging treatment is <5.0;

[0016] And / or, the light transmittance of the adhesive sublayer is ≥85%;

[0017] And / or, the thickness of the adhesive sublayer is 0.05mm-1mm.

[0018] In one embodiment, the adhesive sublayer is a composite layer structure composed of a second reinforcing material and a second transparent resin, wherein the second reinforcing material is selected from glass fiber material.

[0019] In one embodiment, the thickness of the composite layer is 0.2 mm to 5 mm;

[0020] And / or, the thickness of the weather-resistant layer is 0.1mm-4.9mm;

[0021] And / or, the thickness of the adhesive layer is 0.1mm-4.9mm.

[0022] In the photovoltaic module of this invention, the composite layer of this invention can directly replace the structure of transparent front film + encapsulant film + glass fiber reinforcement material + encapsulant film on one surface of the cell layer and / or replace the structure of encapsulant film + backsheet on the other surface of the cell layer. Therefore, compared with conventional photovoltaic modules, the photovoltaic module of this invention has the characteristics of simple structure, lightweight, good weather resistance, high light transmittance and high reliability, thereby effectively improving the photoelectric conversion efficiency and service life of the photovoltaic module. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the composite layer provided by this utility model;

[0025] Figure 2 A schematic diagram of the composite layer in the first embodiment of this utility model;

[0026] Figure 3 A schematic diagram of the composite layer in the second embodiment of this utility model;

[0027] Figure 4 A schematic diagram of the composite layer in the third embodiment of this utility model;

[0028] Figure 5 A schematic diagram of the composite layer in the fourth embodiment of this utility model;

[0029] Figure 6 A schematic diagram of the composite layer in the fifth embodiment of this utility model;

[0030] Figure 7 A schematic diagram of the structure of a photovoltaic module according to the first embodiment of this utility model;

[0031] Figure 8 A schematic diagram of the structure of a photovoltaic module according to the second embodiment of this utility model;

[0032] Figure 9 A schematic diagram of the structure of a photovoltaic module according to the third embodiment of this utility model.

[0033] Figure label:

[0034] 1. Composite layer; 2. Weather-resistant layer; 3. Adhesive layer; 4. Weather-resistant sub-layer; 5. Adhesive sub-layer; 10. Battery cell layer; 11. Transparent front film; 12. Adhesive film; 13. Fiberglass reinforced material; 14. Backsheet. Detailed Implementation

[0035] To facilitate understanding of this utility model, it will be described in more detail below. However, it should be understood that this utility model can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to make the disclosure of this utility model more thorough and complete.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments or examples only and is not intended to be limiting of the invention. The optional scope of the term "and / or" as used herein includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all related listed items.

[0037] The composite layer and photovoltaic module provided by this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] This utility model provides a composite layer 1, such as Figure 1 The diagram shows the structure of the composite layer 1 provided by this utility model. The composite layer 1 includes a weather-resistant layer 2 and an adhesive layer 3 stacked together. The weather-resistant layer 2 has a light transmittance of ≥80% and a yellowing index of <5.0 after aging treatment. The adhesive layer 3 has a light transmittance of ≥80%, an adhesive strength of ≥30N / cm, and a yellowing index of <10.0 after aging treatment.

[0039] In the composite layer 1 of this invention, by setting a weather-resistant layer 2 with specific light transmittance and weather resistance, and an adhesive layer 3 with specific light transmittance, bonding strength, and weather resistance, the composite layer 1 of this invention has high light transmittance, high weather resistance, and high bonding performance through the synergistic effect of the two. Moreover, since the adhesive strength of the adhesive layer 3 is ≥30N / cm, there is a high bonding force between the adhesive layer 3 and the weather-resistant layer 2, which improves the structural stability and bonding strength of the composite layer 1. This results in good bonding between the composite layer 1 and the cell layer 10, improving the reliability and service life of the photovoltaic module.

[0040] Optionally, the bonding strength of the weather-resistant layer 2 is ≥30N / cm; this setting is beneficial to further improve the bonding force between the weather-resistant layer 2 and the bonding layer 3, and at the same time further improve the overall structural stability of the composite layer 1, thereby improving the reliability and service life of the photovoltaic module.

[0041] Furthermore, the yellowing index of the adhesive layer 3 after aging treatment is <5.0; this setting can further improve the weather resistance of the composite layer 1, and at the same time make the weather-resistant layer 2 and the adhesive layer 3 have the same performance, so that either side of the composite layer 1 can be bonded to the battery cell layer 10.

[0042] Optionally, the bonding strength of the adhesive layer 3 is ≥60N / cm; this setting can not only further improve the interlayer bonding force of the composite layer 1 and improve the structural stability of the composite layer 1, but also further improve the bonding strength between the composite layer 1 and the cell layer 10, thereby improving the reliability of the photovoltaic module.

[0043] In this invention, the weather-resistant layer 2 includes at least one weather-resistant sublayer 4. It can be understood that the number of weather-resistant sublayers 4 in the weather-resistant layer 2 can be adjusted according to the performance and thickness requirements of the composite layer 1, such as one, two, or three layers.

[0044] like Figure 2 As shown, the weather-resistant layer 2 includes a weather-resistant sublayer 4.

[0045] like Figures 3-5 As shown, the weather-resistant layer 2 includes two stacked weather-resistant sub-layers 4.

[0046] like Figure 6 As shown, the weather-resistant layer 2 includes three stacked weather-resistant sub-layers 4.

[0047] The weather-resistant sublayer 4 has a light transmittance of ≥80% and a yellowing index of <5.0 after aging treatment. This configuration better achieves a light transmittance of ≥80% for the weather-resistant layer 2 and a yellowing index of <5.0 after aging treatment. It also improves the bonding strength between the layers of the weather-resistant sublayer 4 and the overall adhesive strength of the weather-resistant layer 2, thus working in conjunction with the adhesive layer 3 to give the composite layer 1 high light transmittance, adhesive strength, and weather resistance, thereby improving the lifespan and photoelectric conversion efficiency of the photovoltaic module.

[0048] Optionally, the bonding strength of the weather-resistant sublayer 4 is ≥30N / cm, which is beneficial to further improve the adhesion between the weather-resistant sublayers 4 and better improve the overall structural stability and bonding strength of the weather-resistant layer 2.

[0049] Optionally, the light transmittance of the weather-resistant sublayer 4 is ≥85%; further improving the light transmittance of the weather-resistant layer 2.

[0050] Optionally, the thickness of the weather-resistant sublayer 4 is 0.05mm-1mm. It is understood that the thickness of the weather-resistant sublayer 4 can be any value between 0.05mm and 1mm. Specifically, the thickness of the weather-resistant sublayer 4 includes, but is not limited to, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm.

[0051] In this invention, the weather-resistant sublayer 4 is a composite layer structure composed of a first reinforcing material and a first transparent resin.

[0052] The first reinforcing material is selected from glass fiber materials, preferably glass fiber cloth, glass fiber unidirectional tape, chopped glass fiber, or glass fiber felt.

[0053] Furthermore, the first transparent resin is selected from polyurethane resin, epoxy resin, acrylic resin, silicone resin, or polyester resin.

[0054] In this invention, the adhesive layer 3 includes at least one adhesive sublayer 5. It can be understood that the number of adhesive sublayers 5 in the adhesive layer 3 can be adjusted according to the performance and thickness requirements of the composite layer 1, such as one, two, or three layers.

[0055] like Figures 2-3 As shown, the adhesive layer 3 includes an adhesive sublayer 5.

[0056] like Figure 4 As shown, the adhesive layer 3 includes two stacked adhesive sublayers 5.

[0057] like Figures 5-6 As shown, the adhesive layer 3 includes three stacked adhesive sublayers 5.

[0058] Combination Figures 2-6 As shown, it can be understood that the number of adhesive sub-layers 5 in the adhesive layer 3 in this utility model can be the same as or different from the number of weather-resistant sub-layers 4 in the weather-resistant layer 2, and preferably the same.

[0059] Furthermore, the transmittance of the adhesive sublayer 5 is ≥80%, the bonding strength is ≥30N / cm, and the yellowing index after aging treatment is <10.0. This configuration better achieves the desired transmittance of the adhesive layer 3 (≥80%), bonding strength (≥30N / cm), and yellowing index after aging treatment (<10.0). Simultaneously, it improves the interlayer bonding strength of the adhesive sublayer 5 and the overall bonding strength and weather resistance of the adhesive layer 3. This, in conjunction with the weather-resistant layer 2, results in the composite layer 1 possessing high transmittance, bonding strength, and weather resistance, thereby improving the lifespan and photoelectric conversion efficiency of the photovoltaic module.

[0060] Furthermore, the bonding strength of the adhesive sublayer 5 is ≥60N / cm; this setting is beneficial to improving the bonding force between the adhesive sublayers 5 and improving the overall structural stability and bonding strength of the adhesive layer 3.

[0061] Optionally, the yellowing index of the adhesive sublayer 5 after aging treatment is <5.0; this setting can improve the weather resistance of the adhesive layer 3, and further improve the weather resistance of the composite layer 1 and the photovoltaic module.

[0062] Optionally, the transmittance of the adhesive sublayer 5 is ≥85%; this setting further improves the transmittance of the adhesive layer 3.

[0063] Optionally, the thickness of the adhesive sublayer 5 is 0.05mm-1mm. It is understood that the thickness of the adhesive sublayer 5 can be any value between 0.05mm and 1mm. Specifically, the thickness of the adhesive sublayer 5 includes, but is not limited to, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm.

[0064] The adhesive sublayer 5 comprises a composite layer structure consisting of a second reinforcing material and a second transparent resin.

[0065] The second reinforcing material is selected from glass fiber materials, preferably glass fiber cloth, glass fiber unidirectional tape, chopped glass fiber, or glass fiber felt.

[0066] Furthermore, the second transparent resin is selected from polyurethane resin, epoxy resin, acrylic resin, silicone resin, or polyester resin.

[0067] In this invention, the thickness of the composite layer 1 is 0.2mm-5mm; it can be understood that the thickness of the composite layer 1 can be any value between 0.2mm and 5mm, specifically, the thickness of the composite layer 1 includes, but is not limited to, 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. This configuration facilitates better lamination and bonding with the solar cell layer 10, further improving the reliability of the photovoltaic module.

[0068] Optionally, the thickness of the weather-resistant layer 2 is 0.1mm-4.9mm; it is understood that the thickness of the weather-resistant layer 2 can be any value between 0.1mm and 4.9mm, specifically, the thickness of the weather-resistant layer 2 includes, but is not limited to, 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 4.9mm. With this configuration, the thickness of the composite layer 1 can be further adjusted by adjusting the thickness of the weather-resistant layer 2.

[0069] Optionally, the thickness of the adhesive layer 3 is 0.1mm-4.9mm; it is understood that the thickness of the adhesive layer 3 can be any value between 0.1mm and 4.9mm, specifically, the thickness of the adhesive layer 3 includes, but is not limited to, 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 4.9mm. With this configuration, the thickness of the composite layer 1 can be further adjusted by adjusting the thickness of the adhesive layer 3.

[0070] It should be noted that in this utility model, the thickness of the weather-resistant layer 2 and the thickness of the adhesive layer 3 can be the same or different, but preferably the same.

[0071] It should be noted that in this utility model, the yellowing index after aging treatment of weather-resistant layer 2, adhesive layer 3, weather-resistant sublayer 4, and adhesive sublayer 5 all refer to the difference between the initial yellow index value YI0 and the yellow index YI1 after the yellowing test. In this utility model, a yellow index tester is used to test the initial yellow index value YI0 of weather-resistant layer 2 in composite layer 1 and the value of the yellow index YI1 after the yellowing test. The aging treatment conditions include at least one of the following conditions: a) cumulative ultraviolet irradiation ≥ 45 kWh / m 2 b. High temperature and high humidity aging treatment ≥1000h; c. Thermal aging treatment ≥500h; d. High pressure accelerated aging treatment ≥24h.

[0072] Specifically, for example, the testing conditions for the yellowing index of weathering layer 2 after aging treatment to be <5.0 can be at least one of the following: a) cumulative ultraviolet irradiation ≥45kWh / m 2 After treatment, the surface showed no cracking or delamination, and the yellowing index was <5.0; b. After high temperature and high humidity aging treatment for ≥1000h, the surface showed no cracking or delamination, and the yellowing index was <5.0; c. After dry heat aging treatment for ≥500h, the surface showed no cracking or delamination, and the yellowing index was <5.0; d. After high pressure accelerated aging treatment for ≥24h, the surface showed no cracking or delamination, and the yellowing index was <5.0.

[0073] In addition, this utility model also provides a photovoltaic module, such as Figures 7-9 As shown, the photovoltaic module includes a cell layer 10 and a composite layer 1 disposed on at least one surface of the cell layer 10. The composite layer 1 is as described above, wherein the adhesive layer 3 is stacked on the cell layer 10, and the weather-resistant layer 2 is stacked on the adhesive layer 3.

[0074] It is understood that in this invention, the composite layer 1 can be provided on any surface of the cell layer 10, or the composite layer 1 can be provided on both sides of the cell layer 10. Preferably, the composite layer 1 is provided on both sides of the cell layer 10. That is, the photovoltaic module includes the composite layer 1, the cell layer 10, and the composite layer 1 stacked sequentially. This photovoltaic module has a simpler structure, lighter overall weight, better weather resistance, and higher light transmittance, which can better improve the service life and photoelectric conversion efficiency of the photovoltaic module.

[0075] Specifically, such as Figure 7 As shown, the photovoltaic module includes, from bottom to top, a backsheet 14, an encapsulant film 12, a cell layer 10, and a composite layer 1 stacked sequentially.

[0076] like Figure 8 As shown, the photovoltaic module comprises, from bottom to top, a composite layer 1, a cell layer 10, an encapsulant film 12, a glass fiber reinforced material 13, an encapsulant film 12, and a transparent front film 11, which are stacked sequentially.

[0077] like Figure 9 As shown, the photovoltaic module includes, from bottom to top, a composite layer 1, a cell layer 10, and the composite layer 1 stacked sequentially.

[0078] Therefore, in the photovoltaic module of this utility model, the composite layer 1 of this utility model can directly replace the structure of transparent front film 11 + encapsulant film 12 + glass fiber reinforcement material 13 + encapsulant film 12 on one surface of the cell layer 10 and / or replace the structure of encapsulant film 12 + backsheet 14 on the other surface of the cell layer 10. Therefore, compared with conventional photovoltaic modules, the photovoltaic module of this utility model has the characteristics of simple structure, lightweight, good weather resistance, high light transmittance and high reliability, thereby effectively improving the photoelectric conversion efficiency and service life of the photovoltaic module.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A composite layer, characterized in that, The composite layer comprises a weather-resistant layer and an adhesive layer stacked together, wherein the light transmittance of the weather-resistant layer is ≥80%, and the yellowing index after aging treatment is <5.0; the light transmittance of the adhesive layer is ≥80%, the adhesive strength is ≥30N / cm, and the yellowing index after aging treatment is <10.

0.

2. The composite layer according to claim 1, characterized in that, The bonding strength of the weather-resistant layer is ≥30 N / cm; And / or, the yellowing index of the adhesive layer after aging treatment is <5.0; And / or, the bonding strength of the adhesive layer is ≥60 N / cm.

3. The composite layer according to claim 1 or 2, characterized in that, The weather-resistant layer includes at least one weather-resistant sublayer, wherein the light transmittance of the weather-resistant sublayer is ≥80%, and the yellowing index after aging treatment is <5.

0.

4. The composite layer according to claim 3, characterized in that, The light transmittance of the weather-resistant sublayer is ≥85%; And / or, the bonding strength of the weather-resistant sublayer is ≥30 N / cm; And / or, the thickness of the weather-resistant sublayer is 0.05mm-1mm.

5. The composite layer according to claim 3, characterized in that, The weather-resistant sublayer is a composite layer structure composed of a first reinforcing material and a first transparent resin, wherein the first reinforcing material is selected from glass fiber material.

6. The composite layer according to claim 1 or 2, characterized in that, The adhesive layer includes at least one adhesive sublayer, wherein the light transmittance of the adhesive sublayer is ≥80%, the adhesive strength is ≥30N / cm, and the yellowing index after aging treatment is <10.

0.

7. The composite layer according to claim 6, characterized in that, The bonding strength of the adhesive sublayer is ≥60 N / cm; And / or, the yellowing index of the adhesive sublayer after aging treatment is <5.0; And / or, the light transmittance of the adhesive sublayer is ≥85%; And / or, the thickness of the adhesive sublayer is 0.05mm-1mm.

8. The composite layer according to claim 6, characterized in that, The adhesive sublayer is a composite layer structure composed of a second reinforcing material and a second transparent resin, wherein the second reinforcing material is selected from glass fiber material.

9. The composite layer according to claim 1, characterized in that, The thickness of the composite layer is 0.2mm-5mm; And / or, the thickness of the weather-resistant layer is 0.1mm-4.9mm; And / or, the thickness of the adhesive layer is 0.1mm-4.9mm.

10. A photovoltaic module, characterized in that, The photovoltaic module includes a cell layer and a composite layer disposed on at least one surface of the cell layer, the composite layer being a composite layer as described in any one of claims 1-9, wherein the adhesive layer is stacked on the cell layer and the weather-resistant layer is stacked on the adhesive layer.

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