Photovoltaic module and photovoltaic system

Abstract

The utility model provides a photovoltaic module and a photovoltaic system. The photovoltaic module comprises a photovoltaic back plate, a battery piece and a photovoltaic front plate which are sequentially arranged in a laminated mode. A back adhesive film layer is arranged between the photovoltaic back plate and the battery piece, a front adhesive film layer is arranged between the battery piece and the photovoltaic front plate, and the ratio of the thickness of the front adhesive film layer to the thickness of the back adhesive film layer is 0.6-0.9. Thus, the thickness of the front adhesive film layer and the thickness of the back adhesive film layer are reasonably configured, the risks of subfissure and fragmentation of the battery piece in the lamination process can be reduced, the yield of the photovoltaic module is improved, and the material consumption and the manufacturing cost of the photovoltaic module can be reduced.

Description

A photovoltaic module and a photovoltaic system Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a photovoltaic module and a photovoltaic system. Background Technology

[0002] With increasingly strained global energy supplies, developing new energy sources has become a crucial energy strategy for many countries. Solar energy, due to its relative availability, has attracted growing attention, and in recent years, the solar cell industry has developed rapidly, with photovoltaic modules finding increasingly wider applications.

[0003] However, due to the large thickness of photovoltaic modules in existing technologies, not only are microcracks and fragments prone to occur in the cells during the photovoltaic module lamination process, affecting the yield of photovoltaic modules, but the large thickness of photovoltaic modules also increases the amount of materials used and the manufacturing cost of photovoltaic modules.

[0004] Therefore, how to solve the technical problem of the large thickness of photovoltaic modules in existing technologies has become an urgent issue to be addressed. Summary of the Invention

[0005] This invention provides a photovoltaic module and a photovoltaic system to solve the technical problem of how to reduce the overall thickness of a photovoltaic module.

[0006] This utility model is implemented as follows: This utility model provides a photovoltaic module and a photovoltaic system. The photovoltaic module includes: a photovoltaic backsheet, solar cells, and a photovoltaic front sheet stacked sequentially; a backing adhesive layer is disposed between the photovoltaic backsheet and the solar cells, and a front adhesive layer is disposed between the solar cells and the photovoltaic front sheet, wherein the ratio of the thickness of the front adhesive layer to the thickness of the backing adhesive layer is 0.6 to 0.9.

[0007] Furthermore, the ratio of the basis weight of the front adhesive film layer to the basis weight of the back adhesive film layer is 0.609 to 0.96.

[0008] Furthermore, the thickness of the pre-adhesive film layer is 0.36 mm to 0.45 mm.

[0009] Furthermore, the thickness of the adhesive backing film layer is 0.5 mm to 0.6 mm.

[0010] Furthermore, the basis weight of the pre-adhesive film layer is 280 g / m³. 2 Up to 382g / m 2 .

[0011] Furthermore, the basis weight of the adhesive film layer is 398 g / m³. 2 Up to 460g / m 2 .

[0012] Furthermore, the photovoltaic module also includes a first weather-resistant coating and a second weather-resistant coating; the first weather-resistant coating is disposed on the side of the photovoltaic front panel facing the solar cell, and the second weather-resistant coating is disposed on the side of the photovoltaic front panel away from the solar cell.

[0013] Furthermore, the photovoltaic module also includes a third weather-resistant coating and a fourth weather-resistant coating; the third weather-resistant coating is disposed on the side of the photovoltaic backsheet facing the solar cell, and the fourth weather-resistant coating is disposed on the side of the photovoltaic backsheet away from the solar cell.

[0014] Furthermore, the photovoltaic front panel is a transparent photovoltaic front panel.

[0015] This utility model embodiment also provides a photovoltaic system, which includes the photovoltaic modules as described above.

[0016] In this application, the thickness of the front adhesive film layer and the back adhesive film layer in the photovoltaic module are reasonably configured, which can reduce the risk of microcracks and fragmentation of the cells during the lamination process, improve the yield of the photovoltaic module, and reduce the amount of materials used and the manufacturing cost of the photovoltaic module. Attached Figure Description

[0017] 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.

[0018] Figure 1 is a schematic diagram of a photovoltaic system provided in an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of a photovoltaic module structure provided in another embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the structure of the photovoltaic backsheet in a photovoltaic module provided in another embodiment of the present invention.

[0022] Explanation of key component symbols: 1000, photovoltaic system; 100, photovoltaic module; 10, photovoltaic backsheet; 20, solar cell; 30, photovoltaic front sheet; 40, adhesive backing film; 50, front adhesive film; 11, first backsheet; 12, reinforced backsheet; 61, first weather-resistant coating; 62, second weather-resistant coating; 63, third weather-resistant coating; 64, fourth weather-resistant coating. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as limiting the present utility model. Furthermore, it should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "top", "bottom", "lateral", "longitudinal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to 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 utility model according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] Referring to Figure 1, the photovoltaic system 1000 in this embodiment of the present invention may include the photovoltaic module 100, which may include a plurality of solar cells 20. These solar cells 20 can be connected in series with connectors to form a solar cell string. The solar cell strings in the photovoltaic module 100 can be connected in series, in parallel, or in a series-parallel combination to achieve current collection and output. For example, busbars can be used to connect the solar cell strings.

[0030] The accompanying drawings provided in this application are schematic diagrams, and some elements are not shown in the drawings. Their purpose is to clearly describe the technical solution and highlight the key features of the utility model. They are not intended to limit the technical solution to exclude these unshown elements. That is to say, the accompanying drawings are merely examples and do not represent a limitation on the specific form of the photovoltaic module 100.

[0031] As shown in Figures 2 to 4, the photovoltaic module 100 in this embodiment of the present invention includes: a photovoltaic backsheet 10, a solar cell 20, and a photovoltaic front sheet 30 stacked in sequence; an adhesive backing film layer 40 is disposed between the photovoltaic backsheet 10 and the solar cell 20, and a front adhesive film layer 50 is disposed between the solar cell 20 and the photovoltaic front sheet 30, wherein the ratio of the thickness d1 of the front adhesive film layer 50 to the thickness d2 of the adhesive backing film layer 40 is 0.6 to 0.9.

[0032] Thus, in this application, the thickness d1 of the front adhesive film layer 50 and the thickness d2 of the back adhesive film layer 40 in the photovoltaic module 100 are reasonably configured, which can reduce the risk of microcracks and fragmentation of the cells during the lamination process and improve the yield of the photovoltaic module.

[0033] Furthermore, in this application, the ratio of the thickness d1 of the front encapsulant layer 50 to the thickness d2 of the back adhesive layer 40 in the photovoltaic module 100 is set to 0.6 to 0.9, so that the thickness d1 of the front encapsulant layer 50 in the photovoltaic module 100 can be less than the thickness d2 of the back adhesive layer 40, thereby reducing the thickness d1 of the front encapsulant layer 50 in the photovoltaic module 100, and thus reducing the overall thickness of the photovoltaic module 100, thereby reducing the amount of material used and the manufacturing cost of the photovoltaic module 100.

[0034] Specifically, the photovoltaic module 100 in this embodiment of the present invention includes a photovoltaic backsheet 10. The photovoltaic backsheet 10 can protect and support the solar cells 20, and has reliable insulation, water resistance, and aging resistance. The photovoltaic backsheet 10 can be selected from multiple materials, typically tempered glass, plexiglass, aluminum alloy TPT composite film, etc., and its specific design can be determined according to specific circumstances, without limitation herein.

[0035] As shown in Figures 2 and 4, in some embodiments, the photovoltaic backsheet 10 may include a first backsheet 11 and a reinforcing backsheet 12 stacked on the first backsheet 11. Thus, the first backsheet 11 ensures the flatness of the photovoltaic module 100 and provides support for the multi-layer structure of the photovoltaic module 100. Furthermore, the reinforcing backsheet 12 enhances the overall structural strength of the photovoltaic module 100, further strengthening its mechanical resistance, UV aging resistance, and moisture barrier performance. Therefore, the double-layer backsheet structure of the first backsheet 11 and the reinforcing backsheet 12 in the photovoltaic backsheet 10 increases the rigidity, structural strength, stability, mechanical load performance, and impact resistance of the photovoltaic module 100. This allows the photovoltaic module 100 to withstand greater mechanical stress during production, transportation, installation, and use, reducing the risk of performance degradation and damage due to bending or deformation.

[0036] Furthermore, the first backsheet 11 can be a PET (ethylene phthalate) backsheet, a PVF (polyvinylidene fluoride) backsheet, a PVDF (polyvinylidene fluoride) backsheet, etc., and is not limited here. The reinforcing backsheet 12 can specifically be a PP (polypropylene) substrate, a PET backsheet, etc., and is not limited here.

[0037] Furthermore, the reinforcing backsheet 12 can specifically be a PP substrate containing multiple layers of glass fibers. Specifically, the reinforcing backsheet 12 can be formed by stacking multiple layers of glass fibers on PP material, with the PP material being melted and impregnated onto the glass fibers. In this way, the glass fibers provide a certain degree of rigidity and strength to the reinforcing backsheet 12, and the impregnation of the PP material further enhances the overall structural strength of the reinforcing backsheet 12, enabling it to withstand greater mechanical stress and thus improving the overall mechanical load reliability and service life of the photovoltaic module 100.

[0038] Specifically, solar cells 20 are stacked on the photovoltaic backsheet 10, and the number of solar cells 20 can be one or more. Multiple solar cells 20 can be connected in series with solder strips to form a solar cell string. In some embodiments, the photovoltaic module 100 includes at least two solar cells 20, and two adjacent solar cells 20 are connected in series with connectors to form a solar cell string. The number of solar cell strings can be multiple, and two adjacent solar cell strings can be connected in series or in parallel with busbars.

[0039] Furthermore, in a battery string, adjacent battery cells 20 have overlapping areas. This eliminates the spacing between battery cells 20 in the battery string, allowing more battery cells 20 to be placed in the string and improving its utilization efficiency.

[0040] Furthermore, in a battery string, adjacent cells 20 are spaced apart. This ensures that adjacent cells 20 in the battery string have a certain spacing, preventing them from shading each other and thus improving the photoelectric conversion efficiency of the photovoltaic module 100.

[0041] The types of solar cells 20 in this application include, but are not limited to, passivated emitter rear cell (PERC), tunnel oxide passivated contact cell (TOPCON), heterojunction with intrinsic thin-layer (HIT), back contact cell (BC), and perovskite solar cells (PSC). This embodiment does not specifically limit the type of solar cells 20 in the photovoltaic module 100.

[0042] The battery cell 20 in this embodiment can be a whole battery cell or a sliced ​​battery cell. A sliced ​​battery cell refers to a battery cell 20 formed by cutting a complete whole battery cell. The cutting process includes: laser grooving + cutting (Linear Spectral Clustering, LSC) process and thermal stress cell separation (TMC) process. In some embodiments, the sliced ​​battery cell can be a half battery cell, which can also be understood as a half-cell or a two-piece battery. In some embodiments, the sliced ​​battery cell can be a 3-piece battery cell, a 4-piece battery cell, or an 8-piece battery cell, etc.

[0043] Specifically, the photovoltaic front panel 30 is stacked on the solar cell 20, and the solar cell 20 is located between the photovoltaic back panel 10 and the photovoltaic front panel 30.

[0044] Furthermore, the photovoltaic front panel 30 is a transparent photovoltaic front panel 30. In other words, the photovoltaic front panel 30 can specifically be a transparent photovoltaic front panel 30. In this way, the light transmittance of the photovoltaic module 100 can be increased, thereby increasing the photoelectric conversion efficiency of the photovoltaic module 100.

[0045] It is understandable that "transparent" in "transparent photovoltaic front panel 30" refers to "the light transmittance of the photovoltaic front panel 30 is greater than 90%". In other words, the photovoltaic front panel 30 can be a substrate with a light transmittance greater than 90%. Specifically, the photovoltaic front panel 30 can be one of PET front panel, PVDF front panel, or PVF front panel, and is not limited here. In addition, the photovoltaic front panel 30 can also be ultra-clear glass, which has high light transmittance, high transparency, and superior physical, mechanical, and optical properties. For example, the light transmittance of ultra-clear glass can reach more than 92%, which can protect the solar cell 20 with minimal impact on the efficiency of the solar cell 20.

[0046] As shown in Figure 2, specifically, an adhesive film layer 40 is provided between the photovoltaic backsheet 10 and the solar cell 20. The adhesive film layer 40 can play the role of bonding and buffering. The adhesive film layer 40 can firmly bond the photovoltaic backsheet 10 and the solar cell 20 together, thereby ensuring that the photovoltaic module 100 remains stable under various stresses.

[0047] Specifically, a front adhesive film layer 50 is provided between the solar cell 20 and the photovoltaic front panel 30. The front adhesive film layer 50 can play the role of bonding and buffering. The front adhesive film layer 50 can fix the solar cell 20 and the photovoltaic front panel 30 together, thereby ensuring that the photovoltaic module 100 remains stable under various stresses.

[0048] Specifically, the ratio of the thickness d1 of the front adhesive layer 50 to the thickness d2 of the back adhesive layer 40 is 0.6 to 0.9. Thus, compared to existing technologies where the thickness d1 of the front adhesive layer 50 and the thickness d2 of the back adhesive layer 40 are essentially the same, this application rationally configures the thickness d1 of the front adhesive layer 50 and the thickness d2 of the back adhesive layer 40 in the photovoltaic module 100. This reduces the risk of microcracks and fragmentation of the solar cells 20 during lamination, and improves the yield of the photovoltaic module 100.

[0049] Furthermore, by setting the ratio of the thickness d1 of the front adhesive film layer 50 to the thickness d2 of the back adhesive film layer 40 to 0.6 to 0.9, the thickness d1 of the front adhesive film layer 50 can be reduced, thereby reducing the overall thickness of the photovoltaic module 100. This, in turn, reduces the material and manufacturing costs of the front adhesive film layer 50, thereby reducing the overall cost of the photovoltaic module 100.

[0050] Moreover, since the front encapsulant layer 50 of the photovoltaic module 100 is relatively close to the incident side of the light source, by reducing the thickness d1 of the front encapsulant layer 50, the overall light transmittance of the photovoltaic module 100 can be improved, thereby increasing the photoelectric conversion efficiency of the photovoltaic module 100.

[0051] Furthermore, the ratio of the thickness d1 of the front adhesive layer 50 to the thickness d2 of the back adhesive layer 40 is 0.6 to 0.9. For example, ratios are 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.68, 0.7, 0.72, 0.75, 0.76, 0.78, 0.8, 0.82, 0.84, 0.85, 0.87, 0.88, 0.89, and 0.9. In this way, the adhesion of the front adhesive layer 50 can be guaranteed while reducing the overall thickness of the photovoltaic module 100.

[0052] It is understandable that the ratio of the thickness d1 of the front adhesive layer 50 to the thickness d2 of the back adhesive layer 40 cannot be too small. When the ratio is less than 0.6, the adhesive strength of the front adhesive layer 50 will be insufficient, resulting in the inability to effectively fix the solar cell 20 and the photovoltaic front panel 30 together, thus increasing the risk of displacement and detachment of the photovoltaic front panel 30. Similarly, it is understandable that the ratio of the thickness d1 of the front adhesive layer 50 to the thickness d2 of the back adhesive layer 40 cannot be too large. When the ratio is greater than 0.9, the thickness d1 of the front adhesive layer 50 will be too large, thus failing to effectively reduce the overall thickness of the photovoltaic module 100.

[0053] It is understandable that the thickness d1 of the front adhesive film layer 50 refers to the thickness d1 of the front adhesive film layer 50 in the laminated photovoltaic module 100. The thickness d2 of the back adhesive film layer 40 refers to the thickness d2 of the back adhesive film layer 40 in the laminated photovoltaic module 100.

[0054] Furthermore, for measuring the thickness d1 of the front adhesive layer 50 and the thickness d2 of the back adhesive layer 40, the photovoltaic module 100 can be cut along the thickness direction of the photovoltaic module 100 to expose the cross section of the photovoltaic module 100, thereby measuring the thickness d1 of the front adhesive layer 50 and the thickness d2 of the back adhesive layer 40.

[0055] In one possible implementation, the thickness d1 of the pre-adhesive film layer 50 is 0.36 mm to 0.45 mm. For example, it can be 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.4 mm, 0.41 mm, 0.42 mm, 0.43 mm, 0.44 mm, or 0.45 mm. This ensures the adhesion of the pre-adhesive film layer 50 while reducing the overall thickness of the photovoltaic module 100.

[0056] Understandably, the thickness d1 of the front encapsulant layer 50 cannot be too small. When the thickness d1 of the front encapsulant layer 50 is less than 0.36 mm, the adhesive strength of the front encapsulant layer 50 will be insufficient, resulting in the solar cell 20 and the photovoltaic front panel 30 not being effectively fixed together, thus increasing the risk of displacement and detachment of the photovoltaic front panel 30. At the same time, it is understandable that the thickness d1 of the front encapsulant layer 50 cannot be too large. When the thickness d1 of the front encapsulant layer 50 is greater than 0.45 mm, the thickness d1 of the front encapsulant layer 50 will be too large, thus failing to effectively reduce the overall thickness of the photovoltaic module 100.

[0057] In one possible implementation, the thickness d2 of the adhesive film layer 40 is 0.5 mm to 0.6 mm. For example, it is 0.5 mm, 0.51 mm, 0.52 mm, 0.53 mm, 0.54 mm, 0.55 mm, 0.56 mm, 0.57 mm, 0.58 mm, 0.59 mm, or 0.6 mm. This ensures the adhesion of the adhesive film layer 40 while reducing the overall thickness of the photovoltaic module 100.

[0058] Understandably, the thickness d2 of the adhesive film layer 40 cannot be too small. When the thickness d2 of the adhesive film layer 40 is less than 0.5 mm, the adhesive strength of the adhesive film layer 40 will be insufficient, resulting in the solar cell 20 and the photovoltaic front panel 30 not being effectively fixed together, thus increasing the risk of displacement and detachment of the photovoltaic front panel 30. At the same time, it is understandable that the thickness d2 of the adhesive film layer 40 cannot be too large. When the thickness d2 of the adhesive film layer 40 is greater than 0.6 mm, the thickness d2 of the adhesive film layer 40 will be too large, thus failing to effectively reduce the overall thickness of the photovoltaic module 100.

[0059] Furthermore, the pre-adhesive layer 50 can be one of EVA (ethylene-vinyl acetate copolymer) pre-adhesive layer 50, POE (polyolefin elastomer) pre-adhesive layer 50, EPE (ethylene-propylene copolymer elastomer) pre-adhesive layer 50 or PVB (polyvinyl butyral) pre-adhesive layer 50, but is not limited thereto.

[0060] Furthermore, the adhesive backing layer 40 can be one of EVA (ethylene-vinyl acetate copolymer) adhesive backing layer 40, POE (polyolefin elastomer) adhesive backing layer 40, EPE (ethylene-propylene copolymer elastomer) adhesive backing layer 40 or PVB (polyvinyl butyral) adhesive backing layer 40, but is not limited thereto.

[0061] In one possible implementation, the basis weight ratio of the pre-adhesive film layer 50 to the back adhesive film layer 40 is 0.609 to 0.96. Thus, by setting the basis weight ratio of the pre-adhesive film layer 50 to the back adhesive film layer 40 to 0.609 to 0.96 in this application, the thickness d1 of the pre-adhesive film layer 50 and the thickness d2 of the back adhesive film layer 40 in the photovoltaic module 100 are reasonably configured, which can reduce the risk of microcracks and fragmentation of the solar cells 20 during lamination and improve the yield of the photovoltaic module 100.

[0062] Furthermore, in this application, the ratio of the thickness d1 of the front encapsulant layer 50 to the thickness d2 of the back adhesive layer 40 in the photovoltaic module 100 is set to 0.6 to 0.9, so that the thickness d1 of the front encapsulant layer 50 in the photovoltaic module 100 can be less than the thickness d2 of the back adhesive layer 40, thereby reducing the material and manufacturing costs of the front encapsulant layer 50 and thus reducing the overall cost of the photovoltaic module 100. In addition, by setting the weight ratio of the front encapsulant layer 50 to the back adhesive layer 40 to 0.609 to 0.96, this application can also reduce the total weight of the photovoltaic module 100, thereby achieving lightweighting of the photovoltaic module 100, which is particularly suitable for scenarios such as rooftop photovoltaics or flexible supports where excessive weight is not advisable.

[0063] As we can understand, "gram weight" refers to the mass of an object per unit area, expressed in grams per square meter (g / m2). It is a comprehensive indicator of a material's thickness and density. The higher the gram weight, the greater the mass of the object per unit area; the lower the gram weight, the smaller the mass of the object per unit area.

[0064] Correspondingly, the basis weight of the front adhesive layer 50 refers to the mass of the front adhesive layer 50 per unit area, and the basis weight of the back adhesive layer 40 refers to the mass of the back adhesive layer 40 per unit area. A higher basis weight of the front adhesive layer 50 indicates a greater mass of the front adhesive layer 50 per unit area; a lower basis weight of the front adhesive layer 50 indicates a smaller mass of the front adhesive layer 50 per unit area. Similarly, a higher basis weight of the back adhesive layer 40 indicates a greater mass of the back adhesive layer 40 per unit area; a lower basis weight of the back adhesive layer 40 indicates a smaller mass of the back adhesive layer 40 per unit area.

[0065] Furthermore, the weight ratio of the front adhesive layer 50 to the back adhesive layer 40 is 0.609 to 0.96. For example, it is 0.609, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.695, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, or 0.96.

[0066] It is understandable that the weight ratio of the front adhesive layer 50 to the back adhesive layer 40 cannot be too small. When the ratio is less than 0.609, insufficient material is used in the back adhesive layer 40, resulting in insufficient adhesion and preventing the solar cell 20 and the photovoltaic front panel 30 from being effectively fixed together. This increases the risk of displacement and detachment of the photovoltaic front panel 30. Similarly, it is understandable that the weight ratio of the front adhesive layer 50 to the back adhesive layer 40 cannot be too large. When the ratio is greater than 0.96, excessive material is used in the back adhesive layer 40, increasing its thickness d2 and failing to effectively reduce the overall thickness of the photovoltaic module 100.

[0067] In one possible implementation, the basis weight of the pre-adhesive film layer 50 is 280 g / m². 2 Up to 382g / m 2 For example, 280g / m 2 290g / m 2 300g / m 2 310g / m 2 320g / m 2 330g / m 2 340g / m 2 350g / m 2 360g / m 2 370g / m 2 380g / m 2 381g / m 2 382g / m 2 In this way, the adhesion of the front adhesive film layer 50 can be guaranteed while reducing the overall thickness of the photovoltaic module 100.

[0068] Understandably, the basis weight of the pre-coating layer 50 cannot be too small; the basis weight of the pre-coating layer 50 should be less than 280 g / m². 2Insufficient material usage in the front adhesive film layer 50 can lead to inadequate adhesion, resulting in insufficient bonding strength and preventing the solar cell 20 and photovoltaic front panel 30 from being effectively fixed together. This increases the risk of displacement and detachment of the photovoltaic front panel 30. Furthermore, it is understandable that the basis weight of the front adhesive film layer 50 cannot be too high; currently, the thickness d1 of the adhesive film layer 50 should be greater than 382 g / m². 2 If too much material is used in the front encapsulant layer 50, the overall manufacturing cost of the photovoltaic module 100 will increase, and the thickness d1 of the front encapsulant layer 50 will be too large, thus failing to effectively reduce the overall thickness of the photovoltaic module 100.

[0069] In one possible implementation, the basis weight of the adhesive film layer 40 is 398 g / m². 2 Up to 460g / m 2 For example, 398g / m³ 2 399g / m 2 400g / m 2 405g / m 2 410g / m 2 415g / m 2 420g / m 2 425g / m 2 430g / m 2 440g / m 2 450g / m 2 458g / m 2 459g / m 2 460g / m 2 In this way, the adhesion of the adhesive film layer 40 can be guaranteed while reducing the overall thickness of the photovoltaic module 100.

[0070] Understandably, the basis weight of the 40mm adhesive backing film cannot be too low; when the basis weight of the 40mm adhesive backing film is less than 398g / m²... 2 If the amount of adhesive film layer 40 used is insufficient, its adhesive strength will be inadequate, leading to a failure to effectively bond the solar cell 20 and the photovoltaic front panel 30 together, increasing the risk of displacement and detachment of the photovoltaic front panel 30. Simultaneously, it is understandable that the basis weight of the adhesive film layer 40 cannot be too high; when the thickness d2 of the adhesive film layer 40 exceeds 460 g / m²... 2 If too much material is used in the backing film layer 40, the overall manufacturing cost of the photovoltaic module 100 will increase, and the thickness d2 of the backing film layer 40 will also be too large, thus failing to effectively reduce the overall thickness of the photovoltaic module 100.

[0071] As shown in Figure 3, in one possible embodiment, the photovoltaic module 100 further includes a first weather-resistant coating 61 and a second weather-resistant coating 62; the first weather-resistant coating 61 is disposed on the side of the photovoltaic front panel 30 facing the solar cell 20, and the second weather-resistant coating 62 is disposed on the side of the photovoltaic front panel 30 away from the solar cell 20. Thus, the first weather-resistant coating 61 and the second weather-resistant coating 62 can protect the photovoltaic front panel 30, thereby improving its moisture barrier properties, UV aging resistance, light transmittance, abrasion resistance, and anti-glare properties, thereby improving the overall reliability and service life of the photovoltaic module 100.

[0072] Understandably, weather-resistant coatings can effectively block ultraviolet rays, preventing their degradation of organic materials. Furthermore, weather-resistant coatings possess excellent antioxidant properties, preventing reactions between oxygen and other reactive substances in the air and organic materials, thus reducing oxidative damage. In addition, weather-resistant coatings also possess a certain degree of hardness and wear resistance, protecting the surface of organic materials from mechanical wear and extending their service life. Therefore, the first weather-resistant coating 61 and the second weather-resistant coating 62 are respectively disposed on opposite sides of the photovoltaic front panel 30 in the thickness direction. This improves the weather resistance and wear resistance of the photovoltaic front panel 30.

[0073] Furthermore, since the thickness d1 of the front adhesive layer 50 is reduced in this application, in order to prevent a decrease in the installation stability of the photovoltaic front panel 30 and reduce the risk of displacement or detachment of the photovoltaic front panel 30, in this embodiment of the application, by providing the first weather-resistant coating 61 on the side of the photovoltaic front panel 30 facing the solar cell 20, the adhesion performance between the photovoltaic front panel 30 and the front adhesive layer 50 can also be increased, thereby improving the installation stability of the photovoltaic front panel 30, reducing the risk of displacement or detachment of the photovoltaic front panel 30, and thus improving the structural stability of the photovoltaic module 100.

[0074] Furthermore, the first weather-resistant coating 61 can be a coating coated with acrylic resin paint and / or fluorocarbon resin paint; the second weather-resistant coating can be a coating coated with acrylic resin paint and / or fluorocarbon resin paint.

[0075] Understandably, because acrylic resin has benzene rings and carbon-carbon double bonds, these structures have low absorption capacity for ultraviolet light, and therefore are relatively stable under ultraviolet irradiation, exhibiting excellent UV weather resistance. Therefore, by setting the first weather-resistant coating 61 and / or the second weather-resistant coating to be a coating with acrylic resin paint, the UV resistance and abrasion resistance of the photovoltaic front panel 30 and the photovoltaic module 100 can be effectively improved; at the same time, the overall reliability and service life of the photovoltaic module 100 can be further improved.

[0076] Furthermore, both the first weather-resistant coating 61 and the second weather-resistant coating 62 are transparent weather-resistant coatings. The light transmittance of both the first weather-resistant coating 61 and the second weather-resistant coating 62 is greater than 90%. In this way, the first weather-resistant coating 61 and the second weather-resistant coating 62 can avoid obstructing the solar cell 20, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100.

[0077] In one possible implementation, the photovoltaic module 100 further includes a third weather-resistant coating 63 and a fourth weather-resistant coating 64; the third weather-resistant coating 63 is disposed on the side of the photovoltaic backsheet 10 facing the solar cell 20, and the fourth weather-resistant coating 64 is disposed on the side of the photovoltaic backsheet 10 away from the solar cell 20. Thus, the third weather-resistant coating 63 and the fourth weather-resistant coating 64 can protect the photovoltaic backsheet 10, improving its moisture barrier properties, UV aging resistance, light transmittance, abrasion resistance, and glare prevention, thereby enhancing the overall reliability and service life of the photovoltaic module 100.

[0078] Understandably, weather-resistant coatings can effectively block ultraviolet rays, preventing their degradation of organic materials. Furthermore, weather-resistant coatings possess excellent antioxidant properties, preventing reactions between oxygen and other reactive substances in the air and organic materials, thus reducing oxidative damage. In addition, weather-resistant coatings also exhibit a certain degree of hardness and wear resistance, protecting the surface of organic materials from mechanical wear and extending their service life. Therefore, the third weather-resistant coating 63 and the fourth weather-resistant coating 64 are respectively applied to opposite sides of the photovoltaic backsheet 10 in the thickness direction. This improves the weather resistance and wear resistance of the photovoltaic backsheet 10.

[0079] Furthermore, to prevent a decrease in the installation stability of the photovoltaic backsheet 10 and reduce the risk of displacement or detachment, in this embodiment, by disposing of the third weather-resistant coating 63 on the side of the photovoltaic backsheet 10 facing the solar cell 20, the adhesion between the photovoltaic backsheet 10 and the front adhesive film layer 50 can be increased, thereby improving the installation stability of the photovoltaic backsheet 10, reducing the risk of displacement or detachment, and thus improving the structural stability of the photovoltaic module 100.

[0080] Furthermore, the third weather-resistant coating 63 may be a coating coated with acrylic resin paint and / or fluorocarbon resin paint; the fourth weather-resistant coating may be a coating coated with acrylic resin paint and / or fluorocarbon resin paint.

[0081] Understandably, because acrylic resin has benzene rings and carbon-carbon double bonds, these structures have low absorption capacity for ultraviolet light, and therefore are relatively stable under ultraviolet irradiation, exhibiting excellent UV weather resistance. Therefore, by setting the third weather-resistant coating 63 and / or the fourth weather-resistant coating as a coating with acrylic resin paint, the UV resistance and abrasion resistance of the photovoltaic backsheet 10 and the photovoltaic module 100 can be effectively improved; at the same time, the overall reliability and service life of the photovoltaic module 100 can be further improved.

[0082] Furthermore, both the third weather-resistant coating 63 and the fourth weather-resistant coating 64 are transparent weather-resistant coatings. The light transmittance of both the third weather-resistant coating 63 and the fourth weather-resistant coating 64 is greater than 90%. In this way, the third weather-resistant coating 63 and the fourth weather-resistant coating 64 can avoid obstructing the solar cell 20, thereby improving the photoelectric conversion efficiency of the photovoltaic module 100.

[0083] In one possible implementation, the photovoltaic front panel 30 and the front adhesive film layer 50 are integrally formed. This reduces the risk of separation between the photovoltaic front panel 30 and the front adhesive film layer 50, thereby improving the installation stability of the photovoltaic front panel 30, reducing the risk of displacement or detachment of the photovoltaic front panel 30, and ultimately improving the structural stability of the photovoltaic module 100.

[0084] It is understood that after the photovoltaic module 100 is installed, the front adhesive film layer 50 is located relatively close to the sunlight. Under long-term exposure to ultraviolet light, the front adhesive film layer 50 is prone to photo-oxidation aging or yellowing, leading to a decrease in light transmittance and even a weakening of interfacial adhesion, which in turn causes the photovoltaic front panel 30 to shift or detach. In this embodiment of the present invention, by integrally molding the photovoltaic front panel 30 and the front adhesive film layer 50, separation between the photovoltaic front panel 30 and the front adhesive film layer 50 can be avoided, reducing the risk of displacement or detachment of the photovoltaic front panel 30, thereby improving the structural stability of the photovoltaic module 100.

[0085] In one possible implementation, the photovoltaic backsheet 10 and the adhesive film layer 40 are integrally formed. This reduces the risk of separation between the photovoltaic backsheet 10 and the adhesive film layer 40, thereby improving the installation stability of the photovoltaic backsheet 10, reducing the risk of displacement or detachment of the photovoltaic backsheet 10, and ultimately improving the structural stability of the photovoltaic module 100.

[0086] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an 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.

[0087] Furthermore, the above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: a photovoltaic backsheet, solar cells, and a photovoltaic frontsheet stacked in sequence; an adhesive backing film layer is disposed between the photovoltaic backsheet and the solar cells, and a front adhesive film layer is disposed between the solar cells and the photovoltaic frontsheet, wherein the thickness of the front adhesive film layer is to the thickness of the adhesive backing film layer is 0.6 to 0.

9.

2. The photovoltaic module according to claim 1, characterized in that, The ratio of the basis weight of the front adhesive film layer to the basis weight of the back adhesive film layer is 0.609 to 0.

96.

3. The photovoltaic module according to claim 1, characterized in that, The thickness of the pre-adhesive film layer is 0.36 mm to 0.45 mm.

4. The photovoltaic module according to claim 1, characterized in that, The thickness of the adhesive backing film is 0.5 mm to 0.6 mm.

5. The photovoltaic module according to claim 2, characterized in that, The basis weight of the pre-adhesive film layer is 280 g / m². 2 Up to 382g / m 2 .

6. The photovoltaic module according to claim 2, characterized in that, The basis weight of the adhesive film layer is 398 g / m³. 2 Up to 460g / m 2 .

7. The photovoltaic module according to claim 1, characterized in that, It also includes a first weather-resistant coating and a second weather-resistant coating; the first weather-resistant coating is disposed on the side of the photovoltaic front panel facing the solar cell, and the second weather-resistant coating is disposed on the side of the photovoltaic front panel away from the solar cell.

8. The photovoltaic module according to claim 1, characterized in that, It also includes a third weather-resistant coating and a fourth weather-resistant coating; the third weather-resistant coating is disposed on the side of the photovoltaic backsheet facing the solar cell, and the fourth weather-resistant coating is disposed on the side of the photovoltaic backsheet away from the solar cell.

9. The photovoltaic module according to claim 1, characterized in that, The photovoltaic front panel is a transparent photovoltaic front panel.

10. A photovoltaic system, characterized in that, The photovoltaic system includes: a photovoltaic module as described in any one of claims 1 to 9.

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