Environment-friendly photovoltaic module

Abstract

The utility model provides an environment-friendly photovoltaic assembly. The environment-friendly photovoltaic assembly comprises a laminated piece and a combined frame, the laminated piece is sequentially provided with front plate glass, a first packaging adhesive film, a battery piece layer, a second packaging adhesive film and back plate glass from a light receiving surface to a backlight surface; the battery piece layer comprises a plurality of battery pieces which are arranged in parallel, the adjacent battery pieces are connected with each other through a connecting belt, and the battery piece layer is externally connected with a bus bar. The lead-free battery piece is reasonable in structural design, environment-friendly in material selection, and capable of reducing human body injury and environmental harm due to the adoption of the lead-free battery piece. Meanwhile, pungent smell is generated in the chemical process, ketoxime gas with potential body harm is not generated, lead smoke with body harm is not generated in the assembly production and preparation process, the environment is not affected by assembly recycling, and the requirement for environmental protection is met.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic component production, in particular to an environmentally friendly photovoltaic component. Background Art

[0002] The principle of solar power generation is the photovoltaic effect of semiconductor PN junction. Using the photovoltaic effect, solar cells convert light energy into electrical energy. Solar cell modules, also known as photovoltaic modules, are one of the core components of solar power generation systems. They are connected by connecting strips to photovoltaic cells, and are assembled by front glass, upper packaging film, lower packaging film, back glass, silicone and frame materials to encapsulate the solar cells. Finally, the current is drawn out by the busbar and junction box.

[0003] For a long time, there have been several major pain points in the materials used in traditional photovoltaic modules: First, the connecting strips and busbars usually use copper-based conductive strips mainly made of hot-dip tin-lead alloy solder. Since the coating of the connecting strips and busbars contains lead, it will cause two effects. The first is that lead-containing fumes will be generated during the series connection of the battery cells, causing harm to people; the second is that the recycling of photovoltaic modules will have an environmental impact. Second, in order to improve the outdoor aging resistance of photovoltaic modules, most of the backplane glass of traditional photovoltaic modules uses fluorine-containing backplanes, which has a great impact on the later recycling of the modules. Fluorine-containing backplanes need to be processed by companies with professional qualifications. Third, the production process of aluminum alloy combination frames for traditional photovoltaic modules is high energy consumption and high pollution. Fourth, traditional photovoltaic modules use deoxime-type silicone seals, which will produce ketoxime substances with strong odor and potential physical harm during the curing process.

[0004] In order to solve these problems existing in traditional components, it is necessary to further improve the design of photovoltaic components. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the deficiencies of the prior art, the utility model provides an environmentally friendly photovoltaic component, which will not produce lead smoke that is harmful to the body during the production and processing process, and the recycling of the component will not have an impact on the environment, and will not cause pollution to the environment, thereby meeting environmental protection requirements.

[0006] The technical solution adopted by the utility model to solve its technical problems is: an environmentally friendly photovoltaic component, including a laminate and a combination frame; the laminate is provided with a front plate glass, a first packaging film, a battery layer, a second packaging film and a back plate glass in sequence from the light-receiving surface to the backlight surface; the battery layer includes a plurality of parallel battery cells, adjacent battery cells are connected to each other by connecting strips, and the battery layer is connected to the outside with a busbar.

[0007] Furthermore, the combination frame has a frame groove for assembly and installation of the laminated components, and organic silica gel is injected into the frame groove to bond the laminated components to the combination frame.

[0008] Furthermore, the cell is made of lead-free glass powder paste, which includes conductive powder, lead-free glass powder, organic resin, organic volume and additives; the lead-free glass powder adopts bismuth acid salt system, vanadate system, phosphate system, borate system or tellurate system and mixed system. Lead-free glass powder, as an inorganic binder, generally accounts for 2% to 5% of the total amount of the paste, and plays an important role in the paste. Lead-free glass powder can corrode the anti-reflection film of the silicon nitride layer, increase the adhesion of the silver paste and enhance its conductivity. At the same time, lead-free glass powder can also improve the fluidity of the silver paste and promote its uniform distribution on the surface of the cell, thereby improving the photoelectric conversion efficiency of the solar cell.

[0009] Furthermore, the connecting strip includes a metal substrate and a solder coating arranged outside the metal substrate; the solder coating is a Sn-Ag system or a Sn-Cu system or a Sn-Ag-Cu system or a Sn-Ag-Ni system with a welding temperature of 217 to 227°C, or the solder coating is Sn-Zn and a solder modified by adding Bi trace elements whose welding temperature is compatible with the lead-containing solder Sn63Pb37, or the solder coating is a solder of a low-temperature welding system of a Sn-Bi system or a Sn-In system or a Sn-Bi-Ag, Sn-Bi-Ag-Cu system, and the solder of the low-temperature welding system is suitable for the welding of main-grid-less batteries and HJT battery components.

[0010] Furthermore, the metal substrate is a copper material or a fully coated substrate; the fully coated substrate includes an aluminum substrate and a copper metal substrate wrapped outside the aluminum substrate, and the solder coating is arranged on the outer surface of the copper metal substrate. The copper material and the copper metal substrate can be selected from red copper or oxygen-free copper, with a copper content of ≥99.99%.

[0011] Furthermore, the connecting belt is an integral structure or a segmented structure, wherein the radial cross-section of the connecting belt of the integral structure is flat, circular, triangular, trapezoidal or square, and the connecting belt of the segmented structure includes two shapes of radial cross-sections, which are any two of flat, circular, triangular, trapezoidal or square.

[0012] Furthermore, the bus strap has the same structure as the connecting strap, and the bus strap may also adopt an integrated structure or a segmented structure consistent with the connecting strap, and the material of the bus strap may also adopt a metal substrate consistent with the connecting strap and design the same solder coating on the outside of the metal substrate.

[0013] Furthermore, the backplane glass is a fluorine-free backplane, and the fluorine-free backplane adopts a glass fiber composite material backplane or a PPE backplane or an APE backplane or a co-extruded AOE backplane; wherein the PPE backplane is a PET / PET / PE three-layer structure backplane, the APE backplane is a nylon PA / PET / modified polyolefin three-layer backplane structure, and the co-extruded AOE backplane is a backplane of a co-extruded product of PA, PE and polyolefin.

[0014] Furthermore, the combination frame is a glass fiber reinforced polyurethane GRPU composite combination frame. Compared with the traditional aluminum alloy combination frame, the glass fiber reinforced polyurethane GRPU composite combination frame has higher corrosion resistance and salt spray resistance, is more suitable for marine climate, and has more excellent mechanical and electrical insulation properties. The traditional aluminum alloy combination frame is high in energy consumption and pollution during the production process, and the carbon emission index is very high. The glass fiber reinforced polyurethane GRPU composite combination frame is more in line with the standards of energy conservation and emission reduction.

[0015] The above-mentioned environmentally friendly photovoltaic module also includes a junction box, and the combination frame and the junction box are sealed by dealcoholized silicone. Compared with the de-oxime-type silicone seal used in the sealing of traditional photovoltaic modules, the de-oxime-type silicone seal does not produce ketoxime substances with strong odor and potential health hazards during the curing process, further reducing pollution and meeting environmental protection requirements.

[0016] The beneficial effects of the utility model are that the environmentally friendly photovoltaic module of the utility model has a reasonable structural design, environmentally friendly material selection, and uses lead-free slurry cells to reduce human body damage and environmental damage. At the same time, no pungent odor is generated during the chemical process, and no ketoxime gas with potential physical damage is generated. No lead smoke with physical damage is generated during the production and preparation of the module, and the recycling of the module will not have an impact on the environment, which meets the requirements of environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the optimal embodiment of the utility model (excluding the junction box).

[0019] Figure 2 It is a structural schematic diagram of the connecting belt in the optimal embodiment of the utility model.

[0020] In the figure, 1, front glass 2, first packaging film 3, connecting tape 31, aluminum substrate 32, copper substrate 33, coating 4, battery cell 5, second packaging film 6, back glass 7, and assembly frame. DETAILED DESCRIPTION

[0021] The utility model is now described in further detail in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, so they only show the components related to the utility model, and the directions and references (for example, up, down, left, right, etc.) can only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not adopted in a restrictive sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0022] like Figure 1 An environmentally friendly photovoltaic assembly shown includes a laminate, a combination frame 7 and a junction box.

[0023] Specifically, the laminate is provided with a front glass 1, a first packaging film 2, a battery cell 4 layer, a second packaging film 5 and a back glass 6 in sequence from the light receiving surface to the back light surface. The battery cell 4 layer includes a plurality of parallel battery cells 4, and adjacent battery cells 4 are connected to each other through connecting strips 3.

[0024] In the production and preparation of the laminate, the battery cell 4 needs to be prepared first, and the battery cell 4 is connected to the outer layer through the connecting belt 3. The battery cell 4 layer of the assembled laminate is connected to the outside with a busbar, and the current of the photovoltaic module is led out through the busbar and the junction box.

[0025] The cell 4 is made of lead-free glass powder slurry. The main components of the lead-free glass powder slurry are conductive powder, lead-free glass powder, organic resin, organic volume and additives. As an inorganic binder, lead-free glass powder generally accounts for 2% to 5% of the total slurry. The total proportion is not high, but it plays an important role in the slurry. Lead-free glass powder can corrode the silicon nitride layer anti-reflection film, increase the adhesion of the silver paste and enhance its conductivity. At the same time, lead-free glass powder can also improve the fluidity of the silver paste and promote its uniform distribution on the surface of the cell 4, thereby improving the photoelectric conversion efficiency of the solar cell. In this embodiment, the lead-free glass powder adopts a bismuth system or a vanadate system or a phosphate system or a borate system or a tellurate system and a mixed system.

[0026] In this embodiment, the connecting strap 3 and the bus strap may be made of the same material and structure.

[0027] Specifically, Figure 2 As shown, the connection belt 3 and the busbar are composed of a metal substrate and a solder coating 33 arranged outside the metal substrate. The surface coating 33 of the connection belt 3 and the busbar uses a lead-free solder system. The solder coating 33 can be a solder system with a high temperature welding temperature such as Sn-Ag system, Sn-Cu system, or Sn-Ag-Cu system, Sn-Ag-Ni system, and the welding temperature is in the range of 217 to 227°C; or Sn-Zn and a solder modified by adding Bi trace elements, and the welding temperature is close to the temperature of the lead-containing solder Sn63Pb37.

[0028] The solder coating 33 of the connecting strip 3 and the busbar can also be a solder of a low-temperature welding system such as Sn-Bi system, Sn-In system, Sn-Bi-Ag, Sn-Bi-Ag-Cu system, etc. This solder system is suitable for welding main-grid-less cells and HJT cell assemblies.

[0029] In the selection of the metal substrate, the metal substrate of the connecting strip 3 and the busbar can be a single copper material or a fully coated substrate.

[0030] When a single copper material is used as the metal substrate, the substrate can be red copper or oxygen-free copper with a copper content of ≥99.99%.

[0031] When a fully covered substrate is used as the metal substrate, the metal substrate is the core wire and the material wrapped outside the core wire. The core wire can be an aluminum substrate 31, and a copper metal substrate 32 is wrapped outside the aluminum substrate 31, and a solder coating 33 is arranged on the outer surface of the copper metal substrate 32. In this structural setting, the copper metal substrate 32 can also be made of red copper or oxygen-free copper with a copper content of ≥99.99%.

[0032] The connecting strip 3 and the busbar can be of an integral structure or a segmented structure in the axial direction, wherein the radial cross section of the integral structure is flat, circular, triangular, trapezoidal or square. The segmented structure includes two radial cross sections, which are any two of flat, circular, triangular, trapezoidal or square.

[0033] The backplane glass 6 is a fluorine-free backplane, which is a glass fiber composite material backplane, a PPE backplane, an APE backplane, or a co-extruded AOE backplane; wherein the PPE backplane is a PET / PET / PE three-layer structure backplane, the APE backplane is a nylon PA / PET / modified polyolefin three-layer backplane structure, and the co-extruded AOE backplane is a backplane of PA, PE and polyolefin co-extruded. The backplane glass 6 prepared using the fluorine-free backplane is a single glass component.

[0034] In the actual selection combination, the back panel glass 6 can be made of double glass components by using float glass or embossed glass in addition to single glass components.

[0035] In this embodiment, the combination frame 7 is preferably, but not limited to, a glass fiber reinforced polyurethane GRPU composite combination frame 7. Compared with the traditional aluminum alloy combination frame 7, the glass fiber reinforced polyurethane GRPU composite combination frame 7 has higher corrosion resistance and salt spray resistance, is more suitable for marine climate, and has more excellent mechanical and electrical insulation properties. The traditional aluminum alloy combination frame 7 is high in energy consumption and pollution during the production process, and the carbon emission index is very high. The glass fiber reinforced polyurethane GRPU composite combination frame 7 is more in line with the standards of energy conservation and emission reduction.

[0036] After the laminate and the assembly frame 7 are prepared separately, they need to be assembled. In this embodiment, the assembly is performed in the form of organic silicone bonding. Figure 1 As shown, the combined frame 7 is a profile, and a frame groove is designed on the profile. During assembly, organic silica gel is injected into the frame groove, and the laminate is bonded to the combined frame 7 through the organic silica gel. After the laminate is combined with the combined frame 7, the combined assembly is bonded to the junction box to form a whole. In this process, the combined frame 7 and the junction box are preferably sealed by dealcoholized silica gel bonding. Compared with the de-oxime-type silicone seal used in the sealing of traditional photovoltaic components, the de-alcoholized silica gel seal does not produce ketoxime substances with strong odor and potential health hazards during the curing process, further reduces pollution, and meets environmental protection requirements.

[0037] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An environmentally friendly photovoltaic module, characterized in that: comprising a laminate and a combination frame (7); The laminate is provided with a front plate glass (1), a first packaging adhesive film (2), a battery cell (4) layer, a second packaging adhesive film (5) and a back plate glass (6) in sequence from the light receiving surface to the back light surface; The battery cell (4) layer comprises a plurality of battery cells (4) arranged in parallel, adjacent battery cells (4) are connected to each other via connecting strips (3), and the battery cell (4) layer is provided with a busbar extending outwardly.

2. An environmentally friendly photovoltaic module as claimed in claim 1, characterized in that: The combination frame (7) has a frame groove for assembly and installation of the laminated components, and organic silica gel is injected into the frame groove to bond the laminated components to the combination frame (7).

3. The environmentally friendly photovoltaic module according to claim 1, characterized in that: The battery cell (4) is made of lead-free glass powder paste, which includes conductive powder, lead-free glass powder, organic resin, organic volume and additives; the lead-free glass powder adopts bismuth acid salt system, vanadate system, phosphate system, borate system, tellurate system and mixed system.

4. The environmentally friendly photovoltaic module according to claim 1, characterized in that: The connecting strip (3) comprises a metal substrate and a solder coating (33) arranged outside the metal substrate; the solder coating (33) is a Sn-Ag system or a Sn-Cu system or a Sn-Ag-Cu system or a Sn-Ag-Ni system with a welding temperature of 217 to 227°C, or the solder coating (33) is a Sn-Zn solder or a solder modified by adding Bi trace elements whose welding temperature is compatible with the lead-containing solder Sn63Pb37, or the solder coating (33) is a solder of a low-temperature welding system of a Sn-Bi system or a Sn-In system or a Sn-Bi-Ag, Sn-Bi-Ag-Cu system.

5. An environmentally friendly photovoltaic module as claimed in claim 4, characterized in that: The metal substrate is a copper material or a fully coated substrate; The fully-encapsulated substrate comprises an aluminum substrate (31) and a copper metal substrate (32) encapsulated outside the aluminum substrate (31), and the solder coating (33) is disposed on the outer surface of the copper metal substrate (32).

6. The environmentally friendly photovoltaic module according to claim 1, characterized in that: The connecting belt (3) is of an integral structure or a segmented structure, wherein the radial cross-section of the connecting belt (3) of the integral structure is flat, circular, triangular, trapezoidal or square, and the connecting belt (3) of the segmented structure includes two shapes of radial cross-sections, which are any two of flat, circular, triangular, trapezoidal or square.

7. An environmentally friendly photovoltaic module according to any one of claims 4 or 5, characterized in that: The busbar and the connecting strip (3) have the same structure.

8. The environmentally friendly photovoltaic module according to claim 1, characterized in that: The backplane glass (6) is a fluorine-free backplane, and the fluorine-free backplane adopts a glass fiber composite material backplane, a PPE backplane, an APE backplane, or a co-extruded AOE backplane; wherein the PPE backplane is a backplane with a three-layer structure of PET / PET / PE, the APE backplane is a backplane with a three-layer structure of nylon PA / PET / modified polyolefin, and the co-extruded AOE backplane is a backplane of a co-extruded product of PA, PE and polyolefin.

9. The environmentally friendly photovoltaic module according to claim 1, characterized in that: The combination frame (7) is a glass fiber reinforced polyurethane GRPU composite combination frame (7).

10. The environmentally friendly photovoltaic module according to claim 1, characterized in that: It comprises a junction box, and the combination frame (7) and the junction box are bonded and sealed by dealcoholized silica gel.

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