Printed screen assembly and photovoltaic panel device having the same

Abstract

The application relates to a printing screen assembly and a photovoltaic panel device with the same, wherein the printing screen assembly comprises a cell main body structure, the cell main body structure comprises a plurality of string welding ribbons extending along a first direction; a grid line structure comprises a plurality of main grid lines and a plurality of fish-tail grid lines, each main grid line extends along a second direction of the cell main body structure at intervals, and is electrically connected with each string welding ribbon, and the plurality of fish-tail grid lines are arranged on both sides of the cell main body structure, the extension direction of each fish-tail grid line is at a predetermined angle with the extension direction of the main grid line, and the fish-tail grid line is electrically connected with the main grid line. The technical scheme of the application effectively solves the problems of high manufacturing cost, complex process and low photoelectric conversion efficiency in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of printing screens, and more specifically, to a printing screen assembly and a photovoltaic panel device having therein. Background Technology

[0002] In some traditional screen printing techniques, the electrodes of solar cells typically consist of main grids, sub-grids, and harpoon grid lines. The main grid lines are the primary conductive parts of the electrode, usually printed with a wide layer of silver paste, used to collect current and transmit it to the external circuitry of the cell. The sub-grid lines are used to transfer current from the cell's surface to the main grid lines, while the harpoon grid lines further refine the current collection path, improving the cell's efficiency.

[0003] Among the aforementioned technologies, the use of precious metal silver is high: the main grid lines typically require a thicker layer of silver paste to ensure good conductivity, resulting in a high silver content. Silver is a precious metal, and its high cost significantly increases the production cost of solar cells. The manufacturing process is complex: printing the main grid lines requires high-precision equipment and complex processes to ensure their conductivity and mechanical strength. This not only increases manufacturing costs but also reduces production efficiency. Limited improvement in cell efficiency: Although the main grid lines play a crucial role in current collection, their wide linewidth can block some of the photogenerated carrier generation area, thus limiting the photoelectric conversion efficiency of the cell. Utility Model Content

[0004] This application provides a printing screen assembly and a photovoltaic panel device having the same, to solve the problems of high manufacturing cost, complex process, and low photoelectric conversion efficiency in the prior art.

[0005] A printing screen assembly according to this application includes: a battery cell body structure, the battery cell body structure including a plurality of wire-welded strips extending along a first direction; a grid structure, the grid structure including a plurality of main grid lines and a plurality of harpoon grid lines, each main grid line extending at intervals along a second direction of the battery cell body structure and electrically connected to each wire-welded strip, the plurality of harpoon grid lines being disposed on both sides of the battery cell body structure, the extension direction of each harpoon grid line forming a predetermined angle with the extension direction of the main grid lines and being electrically connected to the main grid lines.

[0006] Furthermore, on the first surface of the main cell structure, the ratio of the width of the main grid line to the spacing between adjacent main grid lines is between 0.46 and 0.97.

[0007] Furthermore, the width of each main gate line is between 5μm and 11μm.

[0008] Furthermore, on the second surface of the main cell structure, the ratio of the width of the main grid line to the spacing of the adjacent main grid lines is between 0.46 and 1.08.

[0009] Furthermore, the width of the harpoon grid line is 1.05 to 1.2 times the width of the main grid line.

[0010] Furthermore, the width of the main grid line at the connection between the harpoon grid line and the main grid line is the same as the width of the harpoon grid line.

[0011] Furthermore, the angle between each harpoon grid line and the first direction is between 25° and 45°.

[0012] Furthermore, the multiple harpoon grid lines are divided into multiple groups, with each group of harpoon grid lines arranged in a figure-eight shape on both sides. Along the direction from the middle of the main structure of the battery cell to the edge of the main structure of the battery cell, the spacing of each group of harpoon grid lines gradually increases.

[0013] Furthermore, each harpoon grid line overlaps with two main grid lines.

[0014] According to another aspect of this application, a photovoltaic panel device is also provided, which includes a photovoltaic panel mounting assembly and a printing screen assembly, wherein the printing screen assembly is the aforementioned printing screen assembly.

[0015] By applying the technical solution of this application, multiple main busbars are connected by string solder ribbons, and harpoon-shaped busbars are connected to the main busbars, thus allowing current to be discharged from the main structure of the solar cell. Connecting the main busbars to the string solder ribbons replaces the existing structure where the main busbars and sub-busbars are connected, reducing the number of main busbars. This saves on main busbar material, reduces the processing complexity associated with connecting the main and sub-busbars, and avoids the main busbars obstructing the solar panel. The technical solution of this application effectively solves the problems of high manufacturing costs, complex processes, and low photoelectric conversion efficiency in existing technologies. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a printing screen assembly according to an embodiment of this application is shown; Figure 2 It shows Figure 1 A schematic diagram of the printing screen assembly from another angle; Figure 3 It shows Figure 1 A schematic diagram of the structure of the main grid lines and harpoon grid lines of the printing screen assembly; Figure 4 It shows Figure 1 A schematic diagram showing the structural comparison of the front and back sides of the printing screen assembly.

[0019] The above figures include the following reference numerals: 10. Main structure of the solar cell; 20. Grid structure; 21. Main grid line; 22. Harpoon grid line. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] like Figures 1 to 4 As shown, the printing screen assembly of this embodiment includes: a battery cell main body structure 10 and a grid structure 20. The battery cell main body structure 10 includes a plurality of wire bonding strips extending along a first direction. The grid structure 20 includes a plurality of main grid lines 21 and a plurality of harpoon grid lines 22. Each main grid line 21 extends at intervals along a second direction of the battery cell main body structure 10 and is electrically connected to each wire bonding strip. The plurality of harpoon grid lines 22 are disposed on both sides of the battery cell main body structure 10. The extension direction of each harpoon grid line 22 is at a predetermined angle to the extension direction of the main grid lines 21 and is electrically connected to the main grid lines 21.

[0024] By applying the technical solution of this embodiment, multiple main busbars 21 are connected by string solder ribbons, and harpoon-shaped busbars 22 are connected to the main busbars 21, thus allowing the current of the main cell structure 10 to be discharged. Connecting the main busbars 21 to the string solder ribbons replaces the structure of connecting the main busbars and sub-busbars in the prior art, reducing the number of main busbars. This saves on the material used for the main busbars, reduces the processing steps involved in connecting the main busbars and sub-busbars, and avoids the main busbars obstructing the solar panel. The technical solution of this embodiment effectively solves the problems of high manufacturing costs, complex processes, and low photoelectric conversion efficiency in the prior art.

[0025] In this embodiment, the ratio of the width of the main grid line 21 to the spacing between adjacent main grid lines 21 is between 0.46 and 0.97. This ratio ensures that the width of the main grid line 21 is sufficient to prevent burnout during current flow while allowing the solar panel to have a larger area for absorbing sunlight, thus improving the panel's energy conversion efficiency. This embodiment uses a ratio of 0.78.

[0026] In this embodiment, the width of each main grid line 21 is between 5μm and 11μm. This makes it less likely for the main grid line 21 to burn out when conducting current. In this embodiment, 9μm is used, which reduces the area of ​​the solar panel being blocked while ensuring normal current conduction of the grid line structure 20.

[0027] In the technical solution of this embodiment, the spacing between adjacent main gate lines 21 is between 7.2μm and 10.8μm.

[0028] In this embodiment, on the second surface of the main cell structure 10, the ratio of the width of the main grid line 21 to the spacing of adjacent main grid lines 21 is between 0.46 and 1.08. In this embodiment, the second surface of the main cell structure 10 is positioned opposite to the first surface of the main cell structure 10; that is, the first surface is the front surface, and the second surface is the back surface. The density of the main grid lines 21 on the back surface is greater than that on the front surface, which helps to maximize the utilization of sunlight and improve the energy conversion efficiency of the solar panel.

[0029] In this embodiment, the width of the harpoon grid line 22 is 1.05 to 1.2 times the width of the main grid line 21. This makes the harpoon grid line 22 less likely to burn out due to high current.

[0030] In this embodiment, the width of the main grid line 21 at the connection between the harpoon grid line 22 and the main grid line 21 is the same as the width of the harpoon grid line 22. This structure helps to protect the connection between the harpoon grid line 22 and the main grid line 21 from burn-out.

[0031] In this embodiment, the angle between each harpoon grid line 22 and the first direction is between 25° and 45°. This structure can improve current collection efficiency. Setting the harpoon grid line 22 and the main grid line 21 at the aforementioned angle can increase the density of the current collection path, reduce the current transmission distance on the battery surface, thereby reducing resistance loss and improving current collection efficiency. The aforementioned harpoon grid line 22 setting can also reduce shading on the battery surface, increase the generation area of ​​photogenerated carriers, and improve the photoelectric conversion efficiency of the battery. Furthermore, the design of the harpoon grid line 22 can reduce the length and width of the main grid line 21, thereby reducing the amount of silver paste used and reducing production costs. By setting the angle between the harpoon grid line 22 and the main grid line 21, the silver paste can be distributed more evenly, improving the utilization rate of the silver paste. The design of the harpoon grid line 22 can reduce the stress on the main grid line 21 during welding and lamination, reducing the risk of microcracks and fragmentation. The angle between the harpoon grid line 22 and the main grid line 21 enhances the mechanical strength of the solar cell and improves its reliability during use. The design of the harpoon grid line 22 provides more welding contact points, reducing the risk of welding misalignment and improving welding quality. By optimizing the layout of the grid structure 20, the harpoon grid line 22 enhances welding stability and reduces potential issues such as voids in the weld. The angled arrangement of the harpoon grid line 22 and the main grid line 21 better adapts to different types of solar cell structures. By adjusting the angle and layout of the harpoon grid line 22, solar cell performance can be optimized according to different solar cell design requirements. The design of the harpoon grid line 22 reduces shading on the solar cell surface, increases the generation area of ​​photogenerated carriers, and thus improves the photoelectric conversion efficiency of the solar cell. By reducing the length and width of the main grid line 21, the harpoon grid line 22 optimizes the appearance of the solar cell, making it more aesthetically pleasing.

[0032] In this embodiment, the multiple harpoon grid lines 22 are divided into multiple groups, with each group having two sides arranged in a figure-eight shape. The spacing between each group of harpoon grid lines 22 gradually increases along the direction from the middle of the main cell structure 10 to its edge. Dividing the harpoon grid lines into multiple groups, each arranged in a figure-eight shape, can significantly improve the performance and reliability of the photovoltaic cell. This optimizes current collection efficiency, reduces silver paste usage, improves cell reliability, enhances welding quality, increases design flexibility, reduces shading area, improves light utilization, and reduces reflection loss.

[0033] In this embodiment, each harpoon grid line 22 overlaps with two main grid lines 21. This structure makes the connection of the harpoon grid lines 22 more secure and avoids wasting too much silver paste. For example, if the harpoon grid line 22 overlaps with four main grid lines 21, it would greatly increase the amount of silver paste used, resulting in a lower cost-effectiveness in terms of current transmission and connection stability. The harpoon grid line 22 connects two main grid lines 21 that are close to the edge of the main cell structure 10.

[0034] This application also provides a photovoltaic panel device, which includes a photovoltaic panel mounting assembly and a printing screen assembly, wherein the printing screen assembly is the aforementioned printing screen assembly.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A printing screen assembly, characterized in that, include: The main body structure of the battery cell (10) includes a plurality of wire strips extending along a first direction; The grid structure (20) includes a plurality of main grid lines (21) and a plurality of harpoon grid lines (22). Each of the main grid lines (21) extends at intervals along the second direction of the main cell structure (10) and is electrically connected to each of the series welding strips. The plurality of harpoon grid lines (22) are disposed on both sides of the main cell structure (10). The extension direction of each harpoon grid line (22) is at a predetermined angle to the extension direction of the main grid line (21) and is electrically connected to the main grid line (21).

2. The printing screen assembly of claim 1, wherein, On the first surface of the main cell structure (10), the ratio of the width of the main grid line (21) to the spacing between adjacent main grid lines (21) is between 0.46 and 1.

08.

3. The printing screen assembly of claim 2, wherein, The width of each of the main gate lines (21) is between 5 μm and 11 μm.

4. The printing screen assembly of claim 2, wherein, On the second surface of the main cell structure (10), the ratio of the width of the main grid line (21) to the spacing between adjacent main grid lines (21) is between 0.46 and 1.

08.

5. The printing screen assembly of claim 4, wherein, The width of the harpoon grid line (22) is 1.05 to 1.2 times the width of the main grid line (21).

6. The printing screen assembly of claim 5, wherein, The width of the main grid line (21) at the connection between the harpoon grid line (22) and the main grid line (21) is the same as the width of the harpoon grid line (22).

7. The printing screen assembly of claim 4, wherein, The angle between each of the harpoon grid lines (22) and the first direction is between 25° and 45°.

8. The printing screen assembly of claim 5, wherein, The harpoon grid lines (22) are divided into multiple groups. Each group of harpoon grid lines (22) is arranged in a figure-eight shape with two sides. The spacing of each group of harpoon grid lines (22) gradually increases along the direction from the middle of the main body structure (10) of the battery cell to the edge of the main body structure (10).

9. The printing screen assembly of claim 5, wherein, Each of the harpoon grid lines (22) overlaps two of the main grid lines (21).

10. A photovoltaic panel arrangement, characterized by The photovoltaic panel device includes a photovoltaic panel mounting assembly and a printing screen assembly, wherein the printing screen assembly is the printing screen assembly according to any one of claims 1 to 9.

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