Bamboo slip type winding photovoltaic module
Through integrated lamination molding and bamboo slip-type winding photovoltaic modules designed with bamboo slip-type structure, the problems of silicon-based solar cell modules are easily leaked, not resistant to bending and appearance defects, achieving small coil diameter winding and high service life, which is suitable for electronic products.
Patent Information
- Application Number
- CN202420441312.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-07
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-03-07
AI Technical Summary
Existing silicon-based solar cell modules have problems such as leakage, bending resistance and appearance defects, making it difficult to achieve a windable design, and the coil diameter after winding is large, which affects portability.
The design of bamboo slip-type winding photovoltaic modules is adopted, and the battery cells and connecting wires are wrapped in flame-retardant and waterproof lamination materials through integrated laminations. Combined with bamboo slip-type structure and through-trough design, small coil diameter winding is achieved.
It effectively avoids the risk of leakage, improves the bending resistance and service life of the components, and has a beautiful appearance, suitable for the carrying and storage of electronic products.
Smart Images
Figure CN222776528U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of solar photovoltaics, in particular to a bamboo-type winding photovoltaic assembly. Background Art
[0002] With the improvement of the power generation efficiency of silicon-based solar cells, in November 2022, according to the latest certification report of the Institute for Solar Energy Research Hamelin (ISFH) in Germany, the conversion efficiency of silicon heterojunction cells independently developed by my country's photovoltaic companies reached 26.81%, setting the highest record for silicon-based solar cell efficiency.
[0003] Although silicon-based solar cells are leading the trend of the times, there are still many limitations in the application market of silicon-based solar modules as electronic products. Solar cells based on single-crystal silicon wafers are inherently weak in bending and cannot be rolled up. It is the fragile nature of silicon-based solar cells that determines that most products on the market are foldable, and it is very difficult to make a rollable module.
[0004] Even if silicon-based solar cells are used to make foldable components, in order to make the middle bending area bend better, double-layer fabric is generally used for stitching. Such products have a greater risk of leakage. Of course, there are also rolled-up silicon-based solar panels on the market that refer to this type of solution, but there is also a risk of leakage at the seams, and the winding area is layered and bulging. As an electronic product at the application end, its appearance has many defects. If an integrated laminated silicon-based solar cell winding component is to be made, it is necessary to overcome the problems of silicon-based solar cells being not resistant to bending and cannot be wound, and the winding diameter of the component should be as small as possible after winding to meet the requirements of easy carrying and storage of electronic products.
[0005] To this end, based on years of dedicated research and exploration in the field of photovoltaic applications, the applicant decided to seek technical solutions to solve the above technical problems. Utility Model Content
[0006] The purpose of the utility model is to solve the problems of easy leakage, poor bending resistance and appearance defects in the prior art, and to provide a bamboo-type winding photovoltaic module to overcome the problems of silicon-based solar cells being poorly bent and unwindable. The silicon-based solar cell winding photovoltaic module is manufactured by an integrated lamination molding method, thereby avoiding the problems existing in the above-mentioned winding modules. Not only is the product safer and more reliable, but the appearance is also more beautiful and the winding service life is also longer.
[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0008] The utility model discloses a bamboo-slab-type winding photovoltaic component, wherein the photovoltaic component structure is formed by lamination in one piece, and from the light-receiving surface to the outer surface, it is: a laminated front plate, a first adhesive film, a bus bar, a battery string, a carrier plate, a second adhesive film, and a laminated back plate; the battery cells on the battery string are arranged in a bamboo-slab-type structure, and the battery cells are connected in series and parallel by bus bars and photovoltaic welding strips; the carrier plate is a hard insulating plate, and the carrier plate and the battery cells are arranged in pairs, and the outer dimensions of the carrier plate are larger than the dimensions of the battery cells; when arranged, the outer contour area of the battery cells is all arranged within the carrier plate area; the laminated front plate, the first adhesive film, the bus bar, the second adhesive film, and the laminated back plate are all made of flexible materials; a spacing for winding is provided between two adjacent carrier plates along the winding direction of the component to form a winding area.
[0009] Furthermore, the winding area is provided with a plurality of through grooves for reducing winding resistance, and the through grooves occupy more than 50% of the area of the winding area, and the width of the through grooves is less than the spacing between two adjacent carrier sheets; the busbar is connected and wired through the winding area without through grooves to the output junction box for current output.
[0010] Furthermore, the laminated front plate is a high-transmittance ETFE film with a thickness of 0.02-0.03 mm.
[0011] Furthermore, the busbar includes a first busbar connected to the front welding strip of the battery cell, a second busbar connected to the back welding strip of the battery cell, and a third busbar connected to the junction box after the first busbar and the second busbar are gathered together; the first busbar and the second busbar are copper busbars with a black coating, and the third busbar adopts a multi-core copper braided belt or FFC / FPC soft cable.
[0012] Furthermore, the carrier board is a hard glass fiber insulation board with a thickness of 0.3mm-1.2mm, and both sides have adhesive backing that can be bonded at room temperature. The side facing the light-receiving side is bonded to the back of the battery cell, and the other side is bonded to the laminated backing plate; and the outer dimensions of the carrier board are 0.5mm-2mm wider than the single side of the battery cell; the spacing between two adjacent carrier sheets along the winding direction of the component is 2mm-9mm.
[0013] Furthermore, the first adhesive film and the second adhesive film are made of EVA\POE\EPE film.
[0014] Furthermore, the laminated backing plate is a fabric having properties such as being impermeable to adhesive tape, flame retardant and / or UV resistant and / or waterproof.
[0015] Furthermore, the laminated backboard is made of black 500D-800D Oxford cloth.
[0016] Furthermore, the solar cell is a copper-grid silicon-based heterojunction solar cell cut into long strips.
[0017] Furthermore, a shielding layer is provided between the first adhesive film and the bus bar, and the shielding layer is a black 200D Oxford cloth fabric that is adhesive-permeable and can shield the bus bar.
[0018] The benefits of the utility model are:
[0019] 1. The utility model uses integrated lamination molding to wrap all the internal connecting wires with adhesive films in a laminated front plate and a laminated back plate with flame retardant and / or UV resistance and / or waterproof properties, thereby avoiding the risk of leakage of stitching process components.
[0020] 2. The winding photovoltaic module adopts a bamboo-style structure design, and a number of through grooves are set on the winding area to reduce the winding resistance, and the through grooves occupy more than 50% of the area of the winding area. This design reduces the winding resistance to a minimum, thereby realizing winding with a small diameter, and will not cause squeezing of the battery cells, thereby further improving the service life of the winding assembly.
[0021] 3. By using black solder strips with black coating, black bus bars and a shielding layer that can shield the component circuits, the appearance of the wound component is more beautiful. Compared with the edge bulging of the stitching process, the appearance is obviously not of the same grade.
[0022] 4. When using copper grid heterojunction solar cells, the copper grid has the advantage of not being easily broken when hidden cracks occur. It can continue to collect and output the photogenerated carriers generated by the broken cells, thereby further improving the service life of the wound assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the structural disassembly of the photovoltaic module of the utility model.
[0024] Figure 2 It is a schematic diagram of the structure of the photovoltaic components of the utility model after integral lamination.
[0025] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle N area.
[0026] Figure 4 It is a plan view schematic diagram of the laminated front plate, the first adhesive film, the shielding layer and the bus bar.
[0027] Figure 5 It is a plan view of a battery string, a carrier plate, a second adhesive film, and a laminated backplane.
[0028] Figure 6 It is a schematic diagram of the structure after the shielding layer and the bus bar are stacked.
[0029] Figure 7 It is a schematic diagram of the structure after the bus bar 400 and the battery string are stacked.
[0030] Figure 8 This is the battery string wiring diagram of Example 1.
[0031] Fig. 9 This is the battery string wiring diagram of Example 2.
[0032] Fig.10 This is the battery string wiring diagram of Example 3. DETAILED DESCRIPTION
[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0034] This embodiment discloses a bamboo-type winding photovoltaic module, such as Figure 1 The structure of the photovoltaic module of this embodiment is shown in FIG. The photovoltaic module structure from the light-receiving surface to the outer surface is: a junction box 900, a laminated front plate 100, a first adhesive film 200, a shielding layer 300, a bus bar 400, a battery string 500, a carrier plate 600, a second adhesive film 700, and a laminated back plate 800.
[0035] The material of the laminated front plate 100 is a high-transmittance ETFE film with a thickness of 0.025 mm.
[0036] The materials of the first adhesive film 200 and the second adhesive film 700 are both 350g EVA\POE\EPE films.
[0037] The shielding layer 300 is a black 200D Oxford cloth fabric that is permeable to glue and can shield the bus bar 400. During high-temperature lamination, the first adhesive film 200 and the second adhesive film 700 can pass through the shielding layer 300 during flow and firmly bond the shielding layer 300 to the laminated front panel 100 and the laminated back panel 800. After lamination and curing, the bus bar 400 of the component cannot be seen by naked eyes from the light-receiving surface.
[0038] The busbar 400 includes a first busbar S2 connected to the front welding strip of the battery cell, a second busbar S1 connected to the back welding strip of the battery cell, and a third busbar connected to the junction box after the first busbar S2 and the second busbar S1 are connected. The first busbar S2 and the second busbar S1 are copper busbars with a black coating on the surface, and the third busbar uses a multi-core copper braided belt or FFC / FPC soft flat cable. According to the load setting requirements, it can carry a current of 5A.
[0039] The cells on the cell string 500 are arranged in a bamboo-like structure, and the cell spacing between two connected cells along the winding direction of the assembly is 5 mm. The cell is a copper-grid silicon-based heterojunction solar cell cut into long strips. When using a copper-grid heterojunction solar cell, the copper grid has the advantage of not being easily broken when hidden cracks occur, and the photogenerated carriers generated by the broken cell can continue to be collected and output, thereby further improving the service life of the winding assembly.
[0040] The carrier board 600 is a black hard glass fiber insulating board with a thickness of 0.8 mm, and both sides have 3M adhesive that can be bonded at room temperature. The side facing the light-receiving side is bonded to the back of the battery cell on the battery string 500, and the other side is bonded to the laminated backplane 800; the carrier board 600 is arranged in pairs with the battery cells on the battery string 500, and the outer dimensions of a single carrier board 600 are 0.5 mm wider than the single side of a single battery cell. When arranged, the outer contour area of a single battery cell is all set within the area of a single carrier board 600.
[0041] The laminated backboard 800 is made of 800D Oxford fabric with black coating, which is non-adhesive, flame-retardant, UV-resistant, waterproof and other properties.
[0042] A spacing for winding is provided between two adjacent carrier sheets 600 along the winding direction of the assembly, forming a winding area. The winding area is provided with a plurality of through slots for reducing the winding resistance, and the through slots occupy more than 50% of the area of the winding area, and the width of the through slots is less than the spacing between the two adjacent carrier sheets; the busbar is connected and wired to the output junction box through the winding area without through slots for current output.
[0043] refer to Figure 2 As shown, it is a schematic diagram of the structure after integrated lamination. The wound photovoltaic module is laminated by a laminator, so that the first adhesive film 200 and the second adhesive film 700 produce an adhesive reaction, and the shielding layer 300, the bus bar 400, the battery string 500, and the carrier plate 600 are wrapped between the laminated front plate 100 and the laminated back plate 800, so as to achieve the effect of integrated lamination. Then, the area a1 between the battery cells of the module is orderly cut out by laser cutting, so that the module presents a bamboo-like structure; in order to make the appearance more beautiful and more convenient for winding, when cutting the outer contour, the notch of area a2 is cut out; when the area a1 and area a2 in the R area are cut, the remaining area A, area B, and area C are the winding area, and the area of the winding area in the R area accounts for less than 30%. In order to facilitate the hanging use of the wound module, the area a3 is cut out to facilitate the binding of the metal eyelet.
[0044] refer to Figure 3 As shown, Figure 2A partial enlarged schematic diagram of the N region of the battery string 500 shows that the battery cells 500-1 and 500-2 are arranged in a bamboo-like structure, and the cell spacing L1 between the battery cells 500-1 and 500-2 is 5mm; the battery cells 500-1 and 500-2 are arranged in pairs with the carrier plates 600-1 and 600-2, and the outer contour area of the battery cell 500-1 is all set in the area of the carrier plate 600-1 and bonded by the 3M adhesive of 600-1, and the edge gap L3 is 0.5mm. The width L2 of the orderly cut area a1 is set to 3mm, which is the main winding area of the simple structure.
[0045] In order to better describe the relationship between the layer structures, the shielding layer 300 and the bus bar 400 are stacked as shown in FIG. Figure 6 As shown, the shielding layer 300 covers the bus bar 400 in all areas except the junction box avoidance area, thereby preventing the bus bar 400 from being exposed and affecting the appearance.
[0046] To further describe the layer structure relationship, the busbar 400 and the battery string 500 are stacked, as shown in FIG. Figure 7 As shown, the second bus bar S1 collects the photogenerated carriers on the back side of the cell 500-1 to the third bus bar, and the first bus bar S2 collects the photogenerated carriers on the front side of the cell 500-1 to the third bus bar, and then transmits them to the junction box for output through the third bus bar. The first bus bar S1 and the second bus bar S2 are both copper bus bars with a black coating.
[0047] refer to Figure 8 As shown, it is a battery string diagram of Example 1, which preferentially connects 3 small battery sheets in parallel to form a small battery unit, and then arranges 10 small battery units in series to obtain a higher current output.
[0048] This embodiment uses an integrated lamination process to wrap all the internal connecting wires with adhesive films in the laminated front plate and laminated back plate with flame retardant and / or UV resistant and / or waterproof properties, thereby avoiding the risk of leakage in the sewing process assembly. The winding photovoltaic assembly adopts a bamboo-style structure design, and a number of through grooves are provided on the winding area to reduce the winding resistance. This design reduces the winding resistance to a minimum, thereby achieving winding with a small diameter, and will not cause extrusion of the battery sheet, thereby further improving the service life of the winding assembly.
[0049] Embodiment 2:
[0050] Different from Example 1, Fig. 9As shown, it is the battery string distribution diagram of Example 2. It is preferred to connect two small battery sheets in parallel to form a small battery unit, and then arrange 15 small battery units in series. The current of the component is two-thirds of that of Example 1. In this way, a higher output voltage is obtained.
[0051] Embodiment 3:
[0052] Different from Example 1, Fig.10 As shown, it is the battery string distribution diagram of Example 3 of the utility model. It is preferred to arrange 30 small battery cells in series. Although a higher output voltage is obtained in this way, the current of the component is one third of that of Example 1.
[0053] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.
Claims
1. A bamboo-type winding photovoltaic module, characterized in that: The photovoltaic module structure is formed by lamination, and from the light-receiving surface to the outer surface, it is: a laminated front plate, a first adhesive film, a bus bar, a battery string, a carrier plate, a second adhesive film, and a laminated back plate; the battery cells on the battery string are arranged in a bamboo-like structure, and the battery cells are connected in series and parallel through bus bars and photovoltaic welding strips; the carrier plate is a hard insulating plate, and the carrier plate and the battery cells are arranged in pairs, and the outer dimensions of the carrier plate are larger than the size of the battery cells; when arranged, the outer contour area of the battery cells is all set within the carrier plate area; the laminated front plate, the first adhesive film, the bus bar, the second adhesive film, and the laminated back plate are all made of flexible materials; a spacing for winding is set between two adjacent carrier plates along the winding direction of the module to form a winding area.
2. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The winding area is provided with a plurality of through grooves for reducing the winding resistance, and the through grooves occupy more than 50% of the area of the winding area, and the width of the through grooves is less than the distance between two adjacent bearing sheets; The busbar is connected and wired through a winding area without a through groove to an output junction box for current output.
3. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The laminated front plate is a high-transmittance ETFE film with a thickness of 0.02-0.03 mm.
4. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The busbar includes a first busbar connected to the front welding strip of the battery cell, a second busbar connected to the back welding strip of the battery cell, and a third busbar connected to the junction box after the first busbar and the second busbar are gathered together; the first busbar and the second busbar are copper busbars with black coating, and the third busbar adopts a multi-core copper braided belt or FFC / FPC soft cable.
5. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The carrier board is a hard glass fiber insulation board with a thickness of 0.3mm-1.2mm, and both sides have adhesive backing that can be bonded at room temperature. The side facing the light-receiving side is bonded to the back of the battery cell, and the other side is bonded to the laminated backing plate; and the outer dimensions of the carrier board are 0.5mm-2mm wider than the single side of the battery cell; the spacing between two adjacent carrier sheets along the winding direction of the component is 2mm-9mm.
6. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The first adhesive film and the second adhesive film are made of EVA\POE\EPE film.
7. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The laminated backing plate is a fabric having tape-impermeable, flame-retardant and / or UV-resistant and / or waterproof properties.
8. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The laminated backboard is made of black 500D-800D Oxford cloth.
9. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: The solar cell is a copper-grid silicon-based heterojunction solar cell cut into long strips.
10. The bamboo-type winding photovoltaic module according to claim 1, characterized in that: A shielding layer is also arranged between the first adhesive film and the bus bar. The shielding layer is a black 200D Oxford cloth fabric that is adhesive-permeable and can shield the bus bar.