Solar cell, solar cell string, photovoltaic module and printing screen
By printing alternating spacers and PAD points on the light-facing side of the solar cell, the high cost and reliability issues of photovoltaic cell isolation materials are solved, achieving more efficient production and more stable photoelectric conversion performance.
Patent Information
- Application Number
- CN202422648538.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-10-31
AI Technical Summary
Existing photovoltaic cell isolation material solutions have high costs, cell warping and hidden cracking problems, affecting production efficiency and reliability.
The positive and negative grid lines are alternately printed on the light-facing side of the solar cell, and a spacer is set on the light-facing side, one-to-one with the PAD point. The spacer is higher than the light-facing side and uses a transparent or translucent light-curing adhesive material.
It reduces production costs, avoids warping and cracking of battery cells, improves production efficiency and battery cell stability, and enhances photoelectric conversion performance.
Smart Images
Figure CN223402760U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of photovoltaic cells, in particular to a solar cell sheet, a solar cell string, a photovoltaic module and a printing screen. Background Art
[0002] Existing back-contact cell isolation solutions are mainly divided into two types: one is to use special separator paper for isolation, and the other is to print photocurable adhesive on the entire front of the cell and cure it with ultraviolet light to achieve isolation.
[0003] Specialized separators are typically made of composite materials, resulting in high production costs. Each cell requires specialized separators, resulting in high overall consumption. This limits the large-scale production and economic viability of photovoltaic cells, significantly increasing the overall cost of photovoltaic systems. Photocurable adhesives, as separator materials, offer an effective alternative to specialized separators due to their ease of printing, scratch resistance, instant curing, high light transmittance, and low cost.
[0004] However, the photocuring adhesive solution also faces a series of technical challenges in practical application. First, after printing the photocuring adhesive on the front side, the cell is prone to warping, affecting its performance and reliability. Second, during the soldering process, the contact between the solder ribbon and the PAD, as well as the presence of the hollow structure on the back side of the cell, can cause hidden cracks. This not only affects the mechanical strength of the cell but can also lead to failure over time.
[0005] Therefore, although photocuring adhesive has significant cost advantages as an isolation material, its technical problems need to be solved urgently. Utility Model Content
[0006] The purpose of the present invention is to provide a solar cell, a solar cell string, a photovoltaic module and a printing screen to solve at least one technical problem in the prior art.
[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:
[0008] A solar cell, wherein the backlight surface has alternating positive and negative gridline regions, wherein a plurality of PAD points are respectively provided in the positive and negative gridline regions;
[0009] A spacing structure is printed on the light-facing surface. The spacing structure includes a plurality of spacers. The spacers are arranged one-to-one with the PAD points. The top surface of the spacers is higher than the light-facing surface.
[0010] In some embodiments, a line connecting the center of the spacer and the center of the corresponding PAD point is perpendicular to the light-facing surface.
[0011] In certain embodiments, in the thickness direction of the solar cell, the orthographic projection of the spacer covers the corresponding PAD point.
[0012] In certain embodiments, in the thickness direction of the solar cell, the orthographic projection of the spacer is circular.
[0013] In certain embodiments, the thickness of the spacer is 300 μm to 800 μm.
[0014] In certain embodiments, the spacer is made of a transparent or translucent material.
[0015] In some embodiments, the spacer is made of photocurable adhesive.
[0016] The present application also provides a solar cell string, comprising at least two solar cell sheets as described above connected by an electrical connector.
[0017] The present application also provides a photovoltaic assembly comprising at least one battery string as described above.
[0018] The present application also provides a printing screen for printing the spacing structure of the solar cell as described above.
[0019] Due to the application of the above technical solution, the beneficial effects of this application compared with the prior art are:
[0020] The solar cell involved in this application has a lower cost by printing a number of spacers on the light-facing side that are arranged one-to-one with the PAD points, compared to the existing solutions of printing light-curing adhesive or using special spacer paper. At the same time, the design of the spacer structure can effectively reduce the stress on the light-facing and backlight surfaces of the solar cell after printing, avoiding the warping of the solar cell and the phenomenon of hidden cracks or splits during the welding process. This improves production efficiency, enhances the overall stability and reliability of the solar cell, and promotes the improvement of photoelectric conversion performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0022] Figure 1 This is a schematic structural diagram of a solar cell according to an embodiment of the present application;
[0023] Figure 2 This is a printing effect diagram of the printing screen described in the embodiment of this application.
[0024] Description of reference numerals:
[0025] 1-positive electrode grid line area; 2-negative electrode grid line area; 3-spacer. DETAILED DESCRIPTION
[0026] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.
[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0028] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.
[0029] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to express a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0030] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.
[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0032] See Figure 1 One embodiment of the present application provides a solar cell, which is a back-contact solar cell having a light-facing surface and a back-facing surface arranged relative to each other along the thickness direction. The back-facing surface has alternating positive electrode gridline regions 1 and negative electrode gridline regions 2, and a plurality of PAD points are respectively provided in the positive electrode gridline regions 1 and the negative electrode gridline regions 2. A spacing structure is printed on the light-facing surface, and the spacing structure includes a plurality of spacers 3. The spacers 3 are arranged one-to-one with the PAD points, and the top surface of the spacers 3 is higher than the light-facing surface. In detail, the spacers 3 are made of light-curing adhesive.
[0033] It's worth noting that PADs are electrode connection points on the backlight side of a solar cell, used to efficiently collect and conduct current. They're typically arranged in alignment with the positive and negative gridlines to ensure optimal current flow. This is a standard structure, so I won't go into detail here.
[0034] In this embodiment, the spacers 3 printed on the light-facing surface are arranged one-to-one with these PAD points, which is lower in cost compared to existing solutions that use photocurable adhesive or special spacer paper. This design also effectively reduces stress on the light-facing and backlight-facing surfaces of the printed solar cell, preventing warping, cracking, or splintering during the soldering process, thereby improving the overall reliability and performance of the cell.
[0035] In some preferred embodiments, a line connecting the center of the spacer 3 and the center of the corresponding PAD point is perpendicular to the light-facing surface.
[0036] In some embodiments, in the thickness direction of the solar cell, the orthographic projection of the spacer 3 covers the corresponding PAD point. Preferably, the orthographic projection of the spacer 3 coincides with the orthographic projection of the PAD point.
[0037] In some embodiments, the orthographic projection of the spacer 3 in the thickness direction of the solar cell is circular. Of course, in other embodiments, the orthographic projection of the spacer 3 may also be rectangular or triangular, which is not specifically limited in this application.
[0038] In certain embodiments, the thickness of the spacer 3 is 300 μm to 800 μm, including but not limited to 300 μm, 400 μm, 500 μm, 600 μm, 700 μm, 800 μm or any thickness other than 300 μm to 800 μm.
[0039] In some embodiments, the spacer 3 is made of a transparent or translucent material. Transparent or translucent materials can effectively transmit light, reduce optical distortion, and avoid affecting the photoelectric conversion efficiency of the solar cell.
[0040] This embodiment also relates to a solar cell string, comprising at least two solar cells as described above connected by an electrical connector.
[0041] This embodiment also relates to a photovoltaic assembly, comprising at least one battery string as described above.
[0042] This embodiment also relates to a printing screen for printing the spacing structure of the solar cell as described above. Figure 2 , shows the printing effect diagram of the printing screen in the embodiment of the present application.
[0043] In this embodiment, the printing screen may include a frame, a mesh, and a coating. The frame is typically made of aluminum alloy or steel to ensure structural stability and durability. The mesh is made of polyester or nylon and has varying pore sizes to meet different printing requirements. The coating is used to fill the pores in the mesh, thereby forming the desired printed pattern. This is a conventional structure and will not be described in detail here.
[0044] Finally, it should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A solar cell, characterized in that: The backlight surface has alternating positive grid line areas and negative grid line areas, and a plurality of PAD points are respectively provided in the positive grid line areas and the negative grid line areas; A spacing structure is printed on the light-facing surface. The spacing structure includes a plurality of spacers. The spacers are arranged one-to-one with the PAD points. The top surface of the spacers is higher than the light-facing surface.
2. The solar cell according to claim 1, wherein: A line connecting the center of the spacer and the center of the corresponding PAD point is perpendicular to the light-facing surface.
3. The solar cell according to claim 2, wherein: In the thickness direction of the solar cell, the orthographic projection of the spacer covers the corresponding PAD point.
4. The solar cell according to claim 2, wherein: In the thickness direction of the solar cell, the orthographic projection of the spacer is circular.
5. The solar cell according to any one of claims 2 to 4, characterized in that: The thickness of the spacer ranges from 300 μm to 800 μm.
6. The solar cell according to claim 1, wherein: The spacer is made of transparent or translucent material.
7. The solar cell according to claim 6, wherein: The spacer is made of light-curing adhesive.
8. A solar cell string, characterized in that: The invention comprises at least two solar cells according to any one of claims 1 to 7 connected by an electrical connector.
9. A photovoltaic module, characterized in that: Comprising at least one battery string as claimed in claim 8.
10. A printing screen, characterized in that: A spacer structure for printing a solar cell according to any one of claims 1 to 7.