Photovoltaic module suitable for agricultural greenhouse

Abstract

The utility model discloses a photovoltaic module suitable for agricultural greenhouse, including transparent front board, hot melt glue front film, photovoltaic cell assembly, hot melt glue back film, transparent backboard, junction box and outer frame, the transparent front board, hot melt glue front film, photovoltaic cell assembly, hot melt glue back film and transparent backboard are sequentially laminated and set up to constitute the laminated part of photovoltaic module, and the junction box is set up on the transparent backboard, the outer frame is set up in the four around laminated part, the photovoltaic cell assembly includes a plurality of through flat tin copper band and is connected together and forms the battery string of integral circuit structure, and a plurality of battery strings are parallel arrangement or staggered arrangement, and keep the gap between the adjacent column, and every battery string includes a plurality of and is arranged the battery piece of a row, and a plurality of battery pieces are connected in series through the circular tin copper band, and keep the gap between the adjacent battery piece. The utility model can effectively solve the problem that the photovoltaic module has no light transmission and is not conducive to the growth of crops and the simple structure of agricultural greenhouse is easy to be collapsed.

Description

Technical Field

[0001] This utility model relates to the technical field of photovoltaic modules, and in particular to a photovoltaic module suitable for agricultural greenhouses. Background Technology

[0002] With increasing reliance on sustainable energy, the photovoltaic (PV) industry has developed rapidly. However, the development and application of PV requires a large amount of land for installation. As the installed capacity of PV modules continues to climb year after year, the land available for direct installation will become increasingly scarce if this trend continues. Expanding the application scenarios for PV modules is therefore imperative. Combining PV modules with agriculture to form an agricultural-photovoltaic complementary application scenario offers the following advantages: it efficiently utilizes land without requiring additional land occupation or changing the land use designation, achieving the dual functions of agricultural production and PV power generation on the same area of ​​land; and installation requires minimal investment, allowing for direct installation as a greenhouse roof.

[0003] Currently, the application of agro-solar hybrid technology (installing photovoltaic modules on the roof of agricultural greenhouses) needs to consider two important indicators:

[0004] 1. Ensure sufficient sunlight, otherwise it will be detrimental to crop growth and cause economic losses;

[0005] 2. Ensure sufficient lightness. Since greenhouses are often single-layer structures and not intended for living, relatively economical building materials are usually chosen. Excessive weight of photovoltaic modules may cause the greenhouse to collapse.

[0006] However, existing conventional photovoltaic modules have the following problems:

[0007] Photovoltaic modules are mainly composed of many series and parallel solar cells. The current design covers the glass surface, and the module surface is basically opaque. Existing photovoltaic modules include single and double glass modules, which are two 2mm+2mm thick glass modules and a 3.2mm thick glass + backsheet module. The glass thickness of both types of modules reaches more than 3.2mm, which leads to a high initial weight of the module and the risk of crushing the greenhouse. Utility Model Content

[0008] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a photovoltaic module suitable for agricultural greenhouses, which can effectively solve the problems that photovoltaic modules are not transparent and are not conducive to crop growth, and that the simple structure of agricultural greenhouses is easily crushed by photovoltaic modules.

[0009] The objective of this utility model can be achieved by adopting the following technical solutions:

[0010] A photovoltaic module suitable for agricultural greenhouses includes a transparent front panel, a hot-melt adhesive front film, a photovoltaic cell module, a hot-melt adhesive back film, a transparent back panel, a junction box, and an outer frame. The transparent front panel, hot-melt adhesive front film, photovoltaic cell module, hot-melt adhesive back film, and transparent back panel are stacked sequentially to form a laminate of the photovoltaic module. The junction box is disposed on the transparent back panel, and the outer frame is disposed around the perimeter of the laminate. The photovoltaic cell module includes multiple cell strings connected together by flat tin-coated copper strips to form an integral circuit structure. The multiple cell strings are arranged in parallel or staggered positions, with gaps maintained between adjacent columns. Each cell string includes multiple cells arranged in a row. The multiple cells are connected in series by circular tin-coated copper strips, with gaps maintained between adjacent cells. All gap areas are used for light transmission.

[0011] Furthermore, the transparent front panel is made of transparent semi-tempered glass.

[0012] Furthermore, the thickness of the transparent front panel is 1.5 to 1.7 mm.

[0013] Furthermore, the transparent front panel is provided with a double-layer AR coating layer to improve light transmittance.

[0014] Furthermore, the transparent backsheet is a PET backsheet with a fluorine-containing layer.

[0015] Furthermore, the thickness of the transparent backplate is 0.33–0.38 mm.

[0016] Furthermore, both the pre-film and post-film of the hot melt adhesive are POE layer polymer hot melt adhesive films.

[0017] Furthermore, the thickness of the hot melt adhesive front film and the hot melt adhesive back film is 0.4 to 0.55 mm.

[0018] Furthermore, the thickness of the photovoltaic cell module is 0.1–0.12 mm.

[0019] Furthermore, the outer frame is made of aluminum alloy and has a rectangular structure, including two long frames and two short frames, which are connected by toothed corner brackets.

[0020] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0021] 1. The photovoltaic module of this utility model has high light transmittance, which can greatly increase the area through which sunlight penetrates, providing sufficient sunlight to crops. Moreover, the position of the irradiation will also move with the movement of the sun, eliminating the need for the covering materials used in the original agricultural greenhouse to prevent crops from being exposed to the sun, and meeting the needs of agricultural photovoltaic complementary scenarios.

[0022] 2. The photovoltaic module of this utility model has the advantage of being ultra-lightweight, with an overall weight of no more than 14KG, which can effectively solve the problem that the simple structure of agricultural greenhouses is easily crushed by photovoltaic modules.

[0023] 3. The hot melt adhesive front and back films of this utility model are made of POE layer high polymer hot melt adhesive film, the back sheet is made of fluorine-containing PET back sheet, and the outer frame is made of aluminum alloy parts, which makes the product have excellent UV resistance, corrosion resistance and weather resistance, ensuring the performance of photovoltaic modules, effectively improving the reliability of single glass modules, and greatly extending the life of photovoltaic modules. Attached Figure Description

[0024] Figure 1 This is an exploded view of the photovoltaic module of Example 1.

[0025] Figure 2 This is a front view of the photovoltaic module in Example 1.

[0026] Figure 3 This is a partial enlarged view of the photovoltaic module in Example 1.

[0027] Figure 4 This is a schematic diagram of the outer frame structure of Example 1.

[0028] Figure 5 This is a front view of the photovoltaic module in Example 2. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0030] Example 1:

[0031] like Figures 1 to 3As shown, this embodiment provides a photovoltaic module suitable for agricultural greenhouses, including a transparent front panel 1, a hot melt adhesive front film 2, a photovoltaic cell module 3, a hot melt adhesive back film 4, a transparent back panel 5, a junction box 6, and an outer frame 7. The transparent front panel 1, the hot melt adhesive front film 2, the photovoltaic cell module 3, the hot melt adhesive back film 4, and the transparent back panel 5 are stacked sequentially to form a laminate of the photovoltaic module. The junction box 6 is bonded to the transparent back panel 5 with silicone, and the outer frame 7 is bonded to the perimeter of the laminate with silicone. The photovoltaic cell module 3 directly converts sunlight into electrical energy by absorbing sunlight and includes multiple cell strings 31. The multiple cell strings 31 are connected together by flat tin-coated copper strips 302 to form an overall circuit structure, and the multiple cell strings 31 are arranged in a staggered manner, forming gaps between the cell strings 31 for light to pass through. Each cell string 31 includes multiple cells 301 arranged in a row. The multiple cells 301 are connected in series by circular tin-coated copper strips 303, and gaps are maintained between adjacent cells 301. All gap areas 8 are used for light to pass through.

[0032] The transparent front panel 1 is made of transparent semi-tempered glass with a thickness of 1.5–1.7 mm, preferably 1.6 mm, to provide overall strength and isolate aging factors and moisture. A double-layer AR coating is provided on the transparent front panel 1 to improve light transmittance.

[0033] The transparent backing plate 5 is a PET backing plate with a fluorine-containing layer, with a thickness of 0.33 to 0.38 mm, preferably 0.35 mm, which improves UV resistance, corrosion resistance and weather resistance.

[0034] Both the hot melt adhesive front film 2 and the hot melt adhesive back film 4 are POE layer polymer hot melt adhesive films with a thickness of 0.4 to 0.55 mm, preferably 0.4 mm. They can isolate the penetration of water vapor and aging substances, have good weather resistance, and ensure the performance of photovoltaic modules.

[0035] The overall thickness of the photovoltaic cell module 3 is 0.4 to 0.55 mm, preferably 0.11 mm.

[0036] like Figure 4 As shown, the outer frame 7 is an aluminum alloy component with a rectangular structure, including two long frames 701 and two short frames 702, which are connected by toothed corner brackets 703. It can be made of 6005-T6 aluminum alloy, which is lightweight and has high tensile strength.

[0037] The junction box in this embodiment is a split junction box, with each unit containing a diode. Each diode has fewer overloaded solar cells, which can effectively reduce the hot spot effect and improve the reliability of the single-glass module.

[0038] The method for manufacturing the photovoltaic module in this embodiment is as follows:

[0039] 1. Lay a hot melt adhesive front film 2 on the surface of the transparent front panel 1;

[0040] 2. The tin-coated circular and flat copper strips are melted by infrared high temperature, and then bonded to the solar cells according to... Figure 2 The arrangement shown is connected in series and parallel to form an overall circuit structure;

[0041] 3. After laying the hot melt adhesive backing film 4, the transparent backing plate 5 is laid on the hot melt adhesive backing film 4, and the laminate is obtained through the lamination process.

[0042] 4. Use silicone to attach the outer frame 7 to the perimeter of the laminate, and use silicone to install the junction box 6 onto the transparent back plate 5.

[0043] This invention allows sunlight to penetrate through the gaps between the battery strings, providing ample sunlight to the crops. As the sun moves, the position of the sunlight also moves, and the position inside the greenhouse varies due to changes in the angle of incidence. This prevents the crops from being exposed to the sun and wilting, eliminating the need for covering materials used in traditional agricultural greenhouses to prevent crops from being exposed to the sun, thus reducing costs.

[0044] Example 2:

[0045] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that multiple battery strings 31 are arranged in parallel, and gaps are maintained between adjacent columns to allow light to pass through.

[0046] The photovoltaic module of this invention weighs approximately 7.2 kg per square meter. Compared with conventional photovoltaic modules, the product weight is reduced by 36% for the same size, which greatly reduces the risk of the greenhouse collapsing.

[0047] The above description is only a preferred embodiment of this utility model patent, but the protection scope of this utility model patent is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in this utility model patent, based on the technical solution and utility model patent concept of this utility model patent, shall fall within the protection scope of this utility model patent.

Claims

1. A photovoltaic module suitable for agricultural greenhouses, characterized in that: The photovoltaic module comprises a transparent front panel, a hot-melt adhesive front film, a photovoltaic cell module, a hot-melt adhesive back film, a transparent back panel, a junction box, and an outer frame. These components are stacked sequentially to form a laminated photovoltaic module. The junction box is located on the transparent back panel, and the outer frame surrounds the laminated module. The photovoltaic cell module includes multiple cell strings connected together by flat tin-coated copper strips to form an integrated circuit structure. These cell strings are arranged in parallel or staggered rows, with gaps between adjacent rows. Each cell string includes multiple solar cells arranged in a row, connected in series by circular tin-coated copper strips. Gaps are maintained between adjacent solar cells, and all gap areas are used for light transmission.

2. The photovoltaic module suitable for agricultural greenhouses according to claim 1, characterized in that: The transparent front panel is made of transparent semi-tempered glass.

3. The photovoltaic module suitable for agricultural greenhouses according to claim 1 or 2, characterized in that: The thickness of the transparent front panel is 1.5 to 1.7 mm.

4. The photovoltaic module suitable for agricultural greenhouses according to claim 1 or 2, characterized in that: The transparent front panel is provided with a double-layer AR coating layer to improve light transmittance.

5. The photovoltaic module suitable for agricultural greenhouses according to claim 1, characterized in that: The transparent backsheet is a PET backsheet with a fluorine-containing layer.

6. The photovoltaic module suitable for agricultural greenhouses according to claim 1 or 5, characterized in that: The thickness of the transparent back panel is 0.33 to 0.38 mm.

7. The photovoltaic module suitable for agricultural greenhouses according to claim 1, characterized in that: Both the front and back films of the hot melt adhesive are POE-layer polymer hot melt adhesive films.

8. The photovoltaic module suitable for agricultural greenhouses according to claim 1 or 7, characterized in that: The thickness of the hot melt adhesive front film and the hot melt adhesive back film is 0.4 to 0.55 mm.

9. The photovoltaic module suitable for agricultural greenhouses according to claim 1, characterized in that: The thickness of the photovoltaic cell module is 0.1 to 0.12 mm.

10. The photovoltaic module suitable for agricultural greenhouses according to claim 1, characterized in that: The outer frame is made of aluminum alloy and has a rectangular structure, including two long frames and two short frames, which are connected by toothed corner brackets.

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