Solar cells, printing screens and photovoltaic modules
By setting a vertical second grid line in the electrode grid line structure of the solar cell, the problem of high internal resistance of the solar cell is solved, the carrier collection efficiency is improved, and the power generation efficiency is enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TRINA SOLAR CO LTD
- Filing Date
- 2025-04-14
- Publication Date
- 2026-06-02
AI Technical Summary
How to reduce the internal resistance of solar cells and improve their power generation efficiency.
In the electrode grid structure of a solar cell, multiple second grid lines perpendicular to the first grid line are set to increase the contact opportunities between charge carriers and the grid lines and reduce the average movement distance of charge carriers.
By adding a second grid line, the average movement distance of charge carriers is reduced, the collection efficiency of charge carriers is improved, and thus the power generation efficiency of solar cells is increased.
Smart Images
Figure CN224319805U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of solar cell technology, and more particularly to a solar cell, a printing screen, and a photovoltaic module. Background Technology
[0002] With the development of solar cell technology, there are increasingly higher requirements for improving the power generation efficiency of cells. In solar cells, charge carriers mainly travel along the grid lines. Due to the sheet resistance of the cell, electrons need to overcome this resistance to reach the fine silver grid, thus enabling current transport.
[0003] Therefore, how to reduce the internal resistance of solar cells and improve the power generation efficiency of solar cells has become a technical problem that needs to be solved in this field.
[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Utility Model Content
[0005] This application provides a solar cell, a printing screen, and a photovoltaic module to solve or alleviate one or more of the technical problems mentioned above.
[0006] As a first aspect of the present application, the present application provides a solar cell, including a solar cell and an electrode grid structure disposed on the surface of the solar cell; the electrode grid structure includes:
[0007] Multiple first grid lines extend from a first side of the surface of the solar cell to a second side, with the first side and the second side being opposite sides;
[0008] Multiple second grid lines perpendicular to the first grid line, the second grid lines being located between two adjacent first grid lines adjacent to the current first grid line.
[0009] In one embodiment, the first gate line is either a main gate line or a fine gate line.
[0010] In one embodiment, the electrode grid line structure includes a main grid line and fine grid lines. The main grid line is a first grid line, and a second grid line is provided between two adjacent fine grid lines along the direction of the main grid line.
[0011] In one embodiment, the length of the second gate line is 1 / 10 to 1 / 3 of the distance between two adjacent first gate lines.
[0012] In one embodiment, the electrode grid line structure includes main grid lines and fine grid lines, the fine grid lines being first grid lines, and 3 to 8 second grid lines being provided between two adjacent main grid lines along the direction of the fine grid lines.
[0013] In one embodiment, the length of the second gate line is 1 / 20 to 3 / 10 of the distance between two adjacent first gate lines.
[0014] In one embodiment, the second grid lines on two adjacent first grid lines are staggered.
[0015] In one embodiment, the width of the second gate line is 8-12 μm.
[0016] As a second aspect of the present application, the present application provides a printing screen for preparing a solar cell in any of the above embodiments; the printing screen includes a film plate with a plurality of strip-shaped perforations to print a plurality of second grid lines through the plurality of strip-shaped perforations.
[0017] As a third aspect of the present application, the present application provides a photovoltaic module including a plurality of solar cells, at least one of which is a solar cell of any of the above embodiments.
[0018] In this embodiment, by setting multiple second grid lines on the first grid line, the contact opportunities between charge carriers and the grid lines are increased, thereby reducing the internal resistance of the cell and improving the power generation efficiency of the solar cell. On the other hand, the perpendicular arrangement of the second grid lines to the first grid line allows charge carriers to move to the grid lines more quickly, reducing the average movement distance of the charge carriers, improving the collection efficiency of the charge carriers, and further improving the power generation efficiency of the solar cell. Attached Figure Description
[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.
[0020] Figure 1 This is a schematic diagram of the electrode grid structure of a solar cell provided in an embodiment of this application.
[0021] Figure 2 Show Figure 1 A partially enlarged structural diagram.
[0022] Figure 3 This diagram illustrates the structure of the electrode grid line structure of a solar cell according to another embodiment of this application.
[0023] Figure 4 Show Figure 3 A partially enlarged structural diagram.
[0024] Figure 5This diagram illustrates the structure of the electrode grid line structure of a solar cell provided in another embodiment of this application.
[0025] Figure 6 Show Figure 5 A partially enlarged structural diagram. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments.
[0027] 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 terms can be used interchangeably 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 a 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.
[0028] In this application, when numerical intervals (i.e., numerical ranges) are involved, unless otherwise specified, the distribution of selectable numerical values within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.
[0029] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. It should be understood that these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein.
[0030] This application provides a solar cell, including a solar cell and an electrode grid structure disposed on the surface of the solar cell. For example... Figures 1 to 6 As shown, the electrode grid structure includes multiple first grid lines and multiple second grid lines 300, with the multiple second grid lines 300 arranged perpendicularly to the first grid lines. The perpendicularity between the second grid lines 300 and the first grid lines is not limited to a strict perpendicularity; it can include a near-perpendicular structure. For example, an angle of 80° to 100° between the second grid lines 300 and the first grid lines is feasible.
[0031] The first grid line extends from a first side to a second side of the surface of the solar cell, with the first and second sides being opposite sides. To output current, the surface of the solar cell is provided with grid lines, such as main grid lines 100 or fine grid lines 200, that penetrate the surface of the solar cell.
[0032] The electrode gate line structure provided in this application embodiment further includes multiple second gate lines 300 perpendicular to the first gate line. The second gate lines 300 are located between two adjacent first gate lines adjacent to the current first gate line. The current first gate line is a first gate line perpendicular to the second gate line 300. Figures 1 to 6 As shown, in any three adjacent first grid lines, the middle one is the current first grid line, and the two first grid lines on either side are two adjacent first grid lines. The second grid line 300 is located between the two adjacent first grid lines and extends from the current first grid line toward the adjacent first grid lines, but does not exceed the adjacent first grid lines. Furthermore, the second grid line 300 does not exceed 1 / 2 or 1 / 3 of the distance between the current first grid line and the adjacent first grid lines; this allows the second grid line 300 to also be provided on the adjacent first grid lines, extending toward the current first grid line.
[0033] In this embodiment, by providing multiple second grid lines 300 on the first grid line, the contact opportunities between charge carriers and the grid lines are increased, thereby reducing the internal resistance of the cell and improving the power generation efficiency of the solar cell. On the other hand, the perpendicular arrangement of the second grid lines 300 to the first grid line allows charge carriers to move to the grid lines more quickly, reducing the average movement distance of the charge carriers, improving the collection efficiency of the charge carriers, and further improving the power generation efficiency of the solar cell.
[0034] In one embodiment, the first gate line is either a main gate line 100 or a fine gate line 200. That is, the first gate line can be either a main gate line 100 or a fine gate line 200.
[0035] In an electrode grid structure comprising a main grid line 100 and fine grid lines 200, where the main grid line 100 is the first grid line, the second grid line 300 is arranged perpendicularly to the main grid line 100. Some charge carriers can move to the fine grid line 200 and then through it to the main grid line 100, forming a current; other charge carriers can move to the second grid line 300 and then through it to the main grid line 100. The reduced distance required for charge carriers to reach the grid line or the main grid line 100 improves the charge carrier collection efficiency, thereby increasing the power generation efficiency of the solar cell.
[0036] In an electrode grid structure comprising a main grid line 100 and a fine grid line 200, with the fine grid line 200 serving as the first grid line, a second grid line 300 is positioned perpendicular to the fine grid line 200. Some charge carriers can move to the fine grid line 200 and then through it to the main grid line 100, forming a current. Other charge carriers can move to the second grid line 300, then through it to the fine grid line 200, and finally to the main grid line 100. This reduced distance for charge carriers to travel to the grid lines improves the charge carrier collection efficiency, thereby increasing the power generation efficiency of the solar cell.
[0037] In the case of a gridless solar cell, where the electrode grid structure includes fine grid lines 200 (the fine grid lines 200 are the first grid lines), multiple second grid lines 300 perpendicular to the fine grid lines 200 are arranged on the fine grid lines 200. Some charge carriers can directly move to the fine grid lines 200; others can move to the second grid lines 300 and then back to the fine grid lines 200. Compared to an electrode grid structure with only fine grid lines 200, the distance that charge carriers travel to the grid lines is reduced, improving the charge carrier collection efficiency and thus increasing the power generation efficiency of the solar cell.
[0038] Therefore, setting multiple second grid lines 300 perpendicular to the main grid line 100 or the fine grid line 200 can improve the power generation efficiency of the battery.
[0039] In one embodiment, the electrode grid line structure includes a main grid line 100 and fine grid lines 200. The main grid line 100 is a first grid line, and a second grid line 300 is provided between two adjacent fine grid lines 200 along the direction of the main grid line 100.
[0040] As shown in the figure, a second grid line 300 is provided between each pair of adjacent fine grid lines 200, and charge carriers between any two adjacent fine grid lines 200 can move to the second grid line 300 in that interval.
[0041] In this embodiment, a second grid line 300 is added to increase the contact opportunity between charge carriers and the second grid line 300. However, the total length of the second grid line 300 in the electrode grid line structure cannot be too long, otherwise it will easily block sunlight from reaching the surface of the solar cell. Therefore, the length of the second grid line 300 is set appropriately to take into account the shading caused to the solar cell.
[0042] With the same total length of the second gate line 300, a second gate line 300 is provided between every two adjacent fine gate lines 200. Compared to providing a longer second gate line 300 between only a portion of two fine gate lines 200, the average movement distance of charge carriers is shorter in the former case. Therefore, in the embodiments of this application, a second gate line 300 is provided between every two adjacent fine gate lines 200.
[0043] It is understood that providing a second gate line 300 between two thin gate lines 200 is also within the protection scope of this application embodiment.
[0044] In one embodiment, the length of the second gate line 300 is 1 / 10 to 1 / 3 of the distance between two adjacent first gate lines.
[0045] As mentioned above, the second grid line 300 cannot extend beyond the adjacent first grid line, and the second grid line 300 cannot extend beyond 1 / 2 of the distance between the current first grid line and the adjacent first grid line, or beyond 1 / 3 of the distance between the current first grid line and the adjacent first grid line; so that the second grid line 300 can also be provided on the adjacent first grid line and extend toward the current first grid line.
[0046] Furthermore, the length of the second grid line 300 is further limited to 1 / 10 to 1 / 3 of the distance between two adjacent first grid lines, for example, 1 / 10, 1 / 7, or 1 / 3. The length of the second grid line 300 does not need to be too long, balancing reducing the average carrier movement distance with not affecting the light absorption of the solar cell; and, if the length of the second grid line 300 is too long, it can easily lead to an increase in paste cost. In addition, if the length of the second grid line 300 is less than 1 / 10 of the distance between two adjacent first grid lines, it is difficult to achieve the effect of reducing the average carrier movement distance.
[0047] In one embodiment, the electrode grid line structure includes a main grid line 100 and a fine grid line 200. The fine grid line 200 is a first grid line. Along the direction of the fine grid line 200, there are 3 to 8 second grid lines 300 between two adjacent main grid lines 100.
[0048] The second gate line 300 is perpendicular to the fine gate line 200. Since the spacing between two adjacent main gate lines 100 is relatively large, the distance that charge carriers travel may be less than half the distance between the two adjacent main gate lines 100 without the second gate line 300. Therefore, by setting the second gate line 300 with a shorter spacing on the fine gate line 200, the distance that charge carriers travel to the gate line can be reduced, and the speed at which charge carriers travel to the gate line can be increased.
[0049] In some examples, there may be 3 to 8 second grid lines 300 between two adjacent main grid lines 100, such as 3, 5 or 8 second grid lines 300.
[0050] The second grid line 300 is uniformly distributed on the fine grid line 200. The spacing between two adjacent second grid lines 300 on a fine grid line 200 is equal or approximately equal, so as to reduce the movement distance of the charge carriers on an average basis, so that the movement distance of each charge carrier is close to the average movement distance.
[0051] In one embodiment, the length of the second gate line 300 is 1 / 20 to 3 / 10 of the distance between two adjacent first gate lines.
[0052] As mentioned above, the second grid line 300 cannot extend beyond the adjacent first grid line, and the second grid line 300 cannot extend beyond 1 / 2 of the distance between the current first grid line and the adjacent first grid line, or beyond 1 / 3 of the distance between the current first grid line and the adjacent first grid line; so that the second grid line 300 can also be provided on the adjacent first grid line and extend toward the current first grid line.
[0053] When the first gate line is a fine gate line 200, compared to the case where the first gate line is a main gate line 100, the number of fine gate lines 200 is greater, and the number of second gate lines 300 is also greater. Since the second gate lines 300 are arranged perpendicular to the fine gate lines 200, the distance that charge carriers travel to the second gate line 300 is shorter. Therefore, the length of the second gate line 300 is relatively short, which reduces the average movement distance of the charge carriers. The length of the second gate line 300 can be limited to 1 / 20 to 3 / 10 of the distance between two adjacent first gate lines, for example, 1 / 20, 1 / 10, 1 / 8, or 3 / 10.
[0054] In one embodiment, the second grid lines 300 on two adjacent first grid lines are staggered.
[0055] When the first grid line is a fine grid line 200, the spacing between adjacent fine grid lines 200 is relatively short. By staggering the second grid lines 300 on two adjacent first grid lines, more charge carriers can find a closer distance to move to the grid line. Therefore, compared with the case where the second grid lines 300 on two adjacent first grid lines are aligned, the average movement distance of the charge carriers is smaller.
[0056] The electrode grid structure also includes a harpoon angle 400, which is located at the end of the main grid line 100. No second grid line 300 is provided within the range of the harpoon angle 400.
[0057] In one embodiment, the width of the second gate line 300 is 8-12 μm.
[0058] The second gate line 300 added in this embodiment has a certain width, which increases the shading area. Considering the impact of the increased shading area on power generation efficiency and the improvement in power generation efficiency due to reduced average carrier movement distance, the width of the second gate line 300 is set to 8-12 μm. That is, within this width range, the improvement in power generation efficiency due to reduced average carrier movement distance is greater than the reduction in power generation efficiency caused by shading.
[0059] The width of the second gate line 300 can be 8um, 10um or 12um, which is narrower than or approximately equal to the width of the fine gate line 200.
[0060] This application also provides a printing screen for preparing a solar cell in any of the above embodiments; the printing screen includes a film plate with multiple strip-shaped perforations to print multiple second grid lines 300 through the multiple strip-shaped perforations.
[0061] Multiple strip-shaped perforations on the film plate are used for printing the second grid line 300. When printing grid lines on the solar cell, the main grid line 100, the fine grid line 200, and the second grid line 300 can be printed sequentially.
[0062] If necessary, the fine grid lines 200 and 300 can be printed simultaneously, since they do not intersect and can therefore be printed together. The printing screen's film plate has perforations corresponding to the fine grid lines 200 and 300.
[0063] This application also provides a photovoltaic module, including a plurality of solar cells, at least one of which is a solar cell of any of the above embodiments.
[0064] 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.
[0065] For ease of description, directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom" generally indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the components themselves. For example, if a device in the drawings is inverted, a device described as "above" or "on top of" other devices or structures will 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 are interpreted accordingly.
[0066] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0067] Unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0069] It should also be noted that the terms "one embodiment," "another embodiment," or "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.
[0070] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0071] It should also be noted that the above are merely preferred embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.
Claims
1. A solar cell, characterized in that, It includes a battery cell and an electrode grid structure disposed on the surface of the battery cell; the electrode grid structure includes: Multiple first grid lines, the first grid lines extending from a first side to a second side of the surface of the battery cell, the first side and the second side being opposite sides; Multiple second gate lines perpendicular to the first gate line, wherein the second gate lines are located between two adjacent first gate lines adjacent to the current first gate line.
2. The solar cell according to claim 1, characterized in that, The first gate line is either a main gate line or a fine gate line.
3. The solar cell according to claim 1, characterized in that, The electrode grid line structure includes a main grid line and fine grid lines. The main grid line is the first grid line. Along the direction of the main grid line, a second grid line is provided between two adjacent fine grid lines.
4. The solar cell according to claim 3, characterized in that, The length of the second gate line is 1 / 10 to 1 / 3 of the distance between two adjacent first gate lines.
5. The solar cell according to claim 1, characterized in that, The electrode grid line structure includes main grid lines and fine grid lines. The fine grid lines are the first grid lines. Along the direction of the fine grid lines, there are 3 to 8 second grid lines between two adjacent main grid lines.
6. The solar cell according to claim 5, characterized in that, The length of the second gate line is 1 / 20 to 3 / 10 of the distance between two adjacent first gate lines.
7. The solar cell according to claim 5, characterized in that, The second gate lines on two adjacent first gate lines are staggered.
8. The solar cell according to any one of claims 1 to 7, characterized in that, The width of the second gate line is 8-12 μm.
9. A printing screen, characterized in that, Used to prepare a solar cell as described in any one of claims 1 to 8; the printing screen includes a film plate having a plurality of strip-shaped perforations for printing a plurality of second grid lines through the plurality of strip-shaped perforations.
10. A photovoltaic module, characterized in that, It includes a plurality of solar cells, at least one of which is a solar cell according to any one of claims 1 to 8.