Rollable and cuttable photovoltaic strip

Abstract

The utility model discloses a photovoltaic strip capable of being curled and cut, which belongs to the technical field of photovoltaic application and comprises a panel and a bottom plate which are oppositely arranged and form a sandwich structure. Photovoltaic units which are linearly and sequentially arranged in a single row are arranged between the panel and the bottom plate, and the adjacent photovoltaic units are connected through electrodes; each photovoltaic unit sequentially comprises an on-crystal conductor from top to bottom, a photovoltaic wafer is arranged at the lower end of the on-crystal conductor, and an under-crystal conductor is arranged at the lower end of the photovoltaic wafer. And the photovoltaic strips can be cut according to actual requirements during installation, so that the field customizability which cannot be realized by the photovoltaic panel is provided. The panel is responsible for light transmission and insulation, and the bottom plate is responsible for wafer protection and insulation; the flexible material allows the light bar to be rolled and transported, and the problem that the size is limited by a transport tool is avoided. The length of the photovoltaic strip can reach the span of a common building, only one photovoltaic strip is needed in the transverse direction when the photovoltaic strip is installed on site, transverse splicing is not needed, and no gap exists.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic application technology, specifically a rollable and cuttable photovoltaic strip. Background Technology

[0002] In traditional photovoltaic (PV) power generation systems, the size of PV panels is limited by manufacturing costs, transportation costs, and installation difficulty. Currently, commonly used PV panels are rectangular, typically 2 x 1 meters. While this design meets the needs of large-scale PV power generation to some extent, it presents several problems in practical applications. First, rigid PV panels, usually made of glass panels and base plates, cannot be parallel to curved mounting surfaces, resulting in gaps between the installed panels and the mounting surface, affecting waterproofing and insulation performance. Second, while existing flexible PV panels possess some bending capability, their limited size makes them unable to cover adjacent areas such as doors and windows on exterior walls. Furthermore, in multi-panel PV power generation systems, PV panels achieve voltage and current superposition through horizontal series and parallel connections, but installation requires a roof or wall with sufficient load-bearing capacity and waterproofing, further limiting their application scenarios.

[0003] In the field of building-integrated photovoltaics (BIPV), photovoltaic (PV) tiles have emerged as a new technology. Their shape mimics traditional building tiles, allowing for seamless overlapping of adjacent panels and providing waterproofing and insulation to the PV array. However, PV tiles also have some drawbacks: each watt weighs more than a rigid panel, the number of tiles dictates higher installation time, and the edge tiles cannot be cut. These issues limit the application of PV tiles in many scenarios. Therefore, existing PV panel technology still falls short in terms of dimensional flexibility, installation convenience, and transportation costs, necessitating a new type of PV strip design to address these problems and meet the needs of diverse building applications. Utility Model Content

[0004] To address the above problems, this utility model provides a rollable and cuttable photovoltaic strip to solve the issues mentioned in the background.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A rollable and cuttable photovoltaic strip includes a panel and a base plate, which are arranged opposite each other to form a sandwich structure. A single row of photovoltaic units is arranged in a straight line between the panel and the base plate, and adjacent photovoltaic units are connected by electrodes. The photovoltaic units are arranged from top to bottom as upper conductors, with a photovoltaic wafer at the lower end of the upper conductor and a lower conductor at the lower end of the photovoltaic wafer. The photovoltaic strip consists of multiple units linearly overlapped and interconnected. Two electrode interfaces, one positive and one negative, are provided at both ends of the photovoltaic strip for external power supply.

[0007] As a further improvement to the above scheme, the orientation of the successor photovoltaic unit of each photovoltaic unit is rotated 180 degrees around the vertical axis, that is, the head and tail are reversed and connected, thereby realizing the series connection of photovoltaic units within the strip to increase the output voltage and reduce internal loss.

[0008] As a further improvement to the above scheme, the on-crystal conductor has a U-shaped structure and functions as a positive electrode.

[0009] As a further improvement to the above scheme, the under-crystal conductor, which is set at the lower end of the flexible photovoltaic wafer, is embedded in the base plate and functions as a negative electrode.

[0010] As a further improvement to the above scheme, the conductor of the photovoltaic unit provides internal connection function, while the two ends of the photovoltaic strip are welded with a pair of external leads, one as a positive terminal interface and the other as a negative terminal interface.

[0011] As a further improvement to the above scheme, both the panel and the base plate are thin-film structures made of organic materials.

[0012] As a further improvement to the above solution, mounting nail positions are provided on the panel.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention provides a rollable and cutable photovoltaic strip, which forms a strip-shaped photovoltaic cell by linearly arranging and overlapping photovoltaic units between a panel and a base plate. The geometric design of the unit conductors allows it to be cut according to actual needs, providing high customizability. Adjacent photovoltaic units are connected by electrodes, and the electrode interfaces at both ends are used not only for internal series connection but also for connection to external circuits, simplifying the system structure. In addition, the sandwich structure formed by the panel and the base plate provides the photovoltaic unit with the necessary insulation, surface light transmission, and base stability.

[0015] The materials in the flexible panel and substrate support the limited bending of the photovoltaic strips. Rolled transport reduces the requirements for transportation vehicles, reaches areas that are difficult to access with large-size rigid panels, reduces transportation costs, and reduces carbon emissions.

[0016] The design of each photovoltaic unit's subsequent photovoltaic unit rotates 180 degrees around the vertical axis, i.e., the first and last units are interchanged and connected, and electrically connected in series.

[0017] Both the panel and the base plate are flexible, thin-film structures made of organic materials. This design makes the photovoltaic strips lightweight, facilitating transportation and installation. The thin-film structure provides excellent flexibility, allowing the photovoltaic strips to be rolled up to adapt to different installation environments, thereby improving their applicability and flexibility. Attached Figure Description

[0018] Figure 1This is a three-dimensional schematic diagram of the present invention.

[0019] Figure 2 This is a side view of the present invention.

[0020] Figure 3 This is a top view of the present invention (after removing the panel).

[0021] Figure 4 This is a schematic diagram of the photovoltaic unit in this utility model.

[0022] In the diagram: 1: Panel; 2: Photovoltaic unit; 2A: On-crystal conductor; 2B: Photovoltaic wafer; 2C: Under-crystal conductor; 3: Base plate. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to the embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0024] like Figure 1-3 As shown, the specific solution of this embodiment is as follows: a rollable and cuttable photovoltaic strip includes a panel 1 and a base plate 3, which are arranged opposite each other to form a sandwich structure; photovoltaic units 2 are arranged in a straight single row between the panel 1 and the base plate 3, and adjacent photovoltaic units 2 are connected by electrodes; two electrode interfaces, one positive and one negative, are provided at both ends of the photovoltaic strip for internal series connection and external electrode connection; the photovoltaic units 2 are arranged from top to bottom as follows: upper conductor 2A, photovoltaic wafer 2B is provided at the lower end of the upper conductor 2A, and lower conductor 2C is provided at the lower end of the photovoltaic wafer 2B. The photovoltaic unit conductors are used for external electrode welding at both ends of the photovoltaic strip, and for series connection of units inside the photovoltaic strip. The panel 1 is glued to the photovoltaic wafer 2B, and the upper conductor 2A and the lower conductor 2C are not glued to the panel 1; the side end of the upper conductor 2A extends downward to the base plate 3, and the side end of the lower conductor 2C extends upward to the panel 1.

[0025] As a preferred embodiment of the above, the orientation of each photovoltaic unit 2's successor photovoltaic unit 2 is rotated 180 degrees around the vertical axis, i.e., the ends are interchanged and connected. The photovoltaic strip length is unlimited, determined by the manufacturer, and cut as needed by the user during installation.

[0026] As a preferred embodiment of the above, the on-crystal conductor 2A has a U-shaped structure.

[0027] In a preferred embodiment, the under-crystal conductor 2C, located at the lower end of the flexible photovoltaic wafer 2B, is embedded within the base plate 3. The wafer material can be flexible monocrystalline silicon or perovskite.

[0028] As a preferred embodiment of the above, both the panel 1 and the base plate 3 are thin-film structures made of organic materials.

[0029] As a preferred embodiment, panel 1 is provided with mounting nail positions, instructing the user to fix the photovoltaic strips in areas where their function cannot be compromised. The photovoltaic strips are installed using a fish-scale lamination method, which forms a waterproof layer on vertical walls and roofs with a slope greater than 1%.

[0030] like Figure 4 The schematic diagram shows that photovoltaic unit 2 has multiple positive and negative electrodes arranged along its length. The positive and negative electrodes of adjacent photovoltaic units are arranged in opposite directions to avoid circuit crossing and reduce the length of series circuits. Each end of the photovoltaic strip has one positive and one negative electrode interface for connecting to external electrodes.

[0031] Photovoltaic Conversion: The photovoltaic strip uses the photovoltaic wafer 2B in photovoltaic unit 2 to convert the received solar energy into electrical energy. The photovoltaic wafer 2B is a semiconductor material that, when exposed to light, can excite electrons to transition from the valence band to the conduction band, thereby generating an electric current.

[0032] Electrode connections: The upper crystal conductor 2A and the lower crystal conductor 2C in photovoltaic unit 2 are located above and below the photovoltaic wafer 2B, respectively, and are used to collect and conduct the current generated by the photovoltaic wafer. Adjacent photovoltaic units 2 are connected in series through the upper and lower crystal conductors.

[0033] Current output: The positive and negative electrode interfaces set at both ends of the photovoltaic strip are used to output the current generated by the internally connected photovoltaic unit 2 to the external circuit.

[0034] Flexible and cuttable design: The photovoltaic strip's panel 1 and base plate 3 are made of organic materials in a thin film structure, which makes the photovoltaic strip flexible and can be rolled and cut to adapt to different installation needs.

[0035] Work process

[0036] Customization in the workshop or on-site:

[0037] Cutting photovoltaic strips: Cut photovoltaic strips to the appropriate length according to the size of the installation location;

[0038] Welding: Lead-out electrodes are welded to both ends of the photovoltaic strip longitudinally.

[0039] Sealing: Apply sealant to both sides of the photovoltaic strip horizontally.

[0040] 2. Install the photovoltaic strips: Install the photovoltaic strips in the required locations using a fish-scale lamination method, according to the installation location needs. The mounting nail positions on panel 1 indicate where users should secure the photovoltaic strips with U-shaped nails in areas where their function cannot be compromised.

[0041] 3. Generating electricity: When sunlight shines on the photovoltaic wafer 2B on the photovoltaic strip, the photovoltaic wafer converts solar energy into electrical energy. The upper conductor 2A and the lower conductor 2C collect the current generated by the photovoltaic wafer and conduct it outwards.

[0042] 4. Series photovoltaic units: The photovoltaic units 2 inside the photovoltaic strip are connected in series through electrodes to form a current output path with superimposed voltage.

[0043] 5. Outputting electrical energy: The circuit interfaces at both ends of the photovoltaic strip output the current generated by the internally connected photovoltaic units to the external circuit. The positive interface outputs positive current, and the negative interface outputs negative current.

[0044] 6. Power utilization: The positive and negative poles of the photovoltaic strip can be connected in parallel with adjacent photovoltaic strips of the same specification to supply power to electrical appliances with matching voltage, usually a photovoltaic inverter.

[0045] Based on the above working principle and process, this rollable and cuttable photovoltaic strip can be flexibly installed on various surfaces, efficiently converting solar energy into electrical energy, and is easy to maintain and expand.

[0046] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A rollable and cutable photovoltaic strip, characterized in that, It includes a panel (1) and a base plate (3), which are arranged opposite each other and form a sandwich structure; a photovoltaic unit (2) is arranged in a straight single row between the panel (1) and the base plate (3), and adjacent photovoltaic units (2) are connected by electrodes; the photovoltaic unit (2) is a crystal upper conductor (2A) from top to bottom, a photovoltaic wafer (2B) is arranged at the lower end of the crystal upper conductor (2A), and a crystal lower conductor (2C) is arranged at the lower end of the photovoltaic wafer (2B).

2. The rollable and cutable photovoltaic strip according to claim 1, characterized in that, The orientation of each photovoltaic unit (2) and its successor photovoltaic unit (2) rotates 180 degrees around the vertical axis, that is, the head and tail are reversed and connected.

3. The rollable and cutable photovoltaic strip according to claim 1, characterized in that, The on-crystal conductor (2A) has a U-shaped structure.

4. The rollable and cutable photovoltaic strip according to claim 1, characterized in that, The under-crystal conductor (2C) located at the lower end of the photovoltaic wafer (2B) is embedded in the base plate (3).

5. A rollable and cutable photovoltaic strip according to claim 1, characterized in that, The photovoltaic units (2) are adjacent to each other along the length direction, and the conductor of each photovoltaic unit extends and overlaps the next unit regardless of whether it is above or below; the positive and negative electrodes of adjacent photovoltaic units are arranged in opposite directions; the conductors at both ends of the photovoltaic strip are used to weld a positive electrode interface and a negative electrode interface.

6. A rollable and cutable photovoltaic strip according to claim 1, characterized in that, Both the panel (1) and the base plate (3) are flexible thin-film structures made of organic materials.

7. A rollable and cutable photovoltaic strip according to claim 1, characterized in that, The panel (1) has mounting nail positions.

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