Solar cell and photovoltaic module
By setting up a reinforced structure on the main gate line of the solar cell and overlapping the thin gate line, the problem of insufficient welding performance of the main gate line is solved, the welding performance and pull-off force are improved, and the slurry consumption of the thin gate line is reduced, and cost optimization is achieved.
Patent Information
- Application Number
- CN202421994616.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The welding performance of the main gate line and the thin gate line in existing solar cells is insufficient, resulting in low over-welding tension and reduced power, and high slurry consumption of the thin gate line.
A reinforcement structure is provided on the main gate line of the solar cell, and the two ends of the thin gate line are overlapped with the ends of the adjacent reinforcement structure to form a structure in which the main gate line is slurry, so as to prevent the thin gate line from penetrateing the main gate line.
The welding performance and pull-off force of the main gate line are improved, and the slurry consumption of the fine gate line is reduced, thereby improving the welding performance of the solar cell and reducing production costs.
Smart Images
Figure CN223231520U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to a solar cell and a photovoltaic assembly. Background Art
[0002] In the existing busbar design of solar cells, all the fine grids of the cells are passed through the busbars to consider printing stability. Due to the inconsistency of the printing pastes for the busbars and fine grids, the main consideration for the busbars is weldability, while the focus for the fine grids is current collection. In the printing process, the busbars are printed first, followed by the fine grids. The fine grids are designed to be superimposed on the busbars, so that the height of the overlapping area of the fine grids and the busbars is higher than that of other areas of the busbars. At the same time, the welding performance of the fine grid paste is worse than that of the busbar paste. When reducing the busbar consumption, such as narrowing the busbar connecting wires or directly eliminating the connecting wires, the welding of the cells is prone to low over-welding tension and power reduction when packaging the components. At the same time, it is easy to have cold solder joints or broken grid failures during reliability testing. Utility Model Content
[0003] Based on this, it is necessary to provide a solar cell and a photovoltaic module to address the technical problems of low over-welding tension and reduced power that are easily encountered in solar cells in the prior art.
[0004] A solar cell, comprising:
[0005] Battery cell body;
[0006] Busbars, a plurality of busbars are arranged on the cell body at intervals, the plurality of busbars are parallel, and the busbars extend along a first direction;
[0007] A reinforcement structure, wherein a plurality of the reinforcement structures are arranged on each main grid line at intervals, and the reinforcement structures extend along the second direction;
[0008] Fine grid lines, multiple fine grid lines are arranged at intervals along the first direction, and the fine grid lines extend along the second direction. The two ends of each fine grid line along the second direction are respectively overlapped with the opposite ends of two adjacent reinforcement structures, and the ends of two adjacent fine grid lines overlapped on the same reinforcement structure are spaced apart.
[0009] In one embodiment, the reinforcement structure is symmetrically arranged on both sides of the main grid line with the main grid line as a symmetry axis.
[0010] In one embodiment, the width of the reinforcement structure gradually increases from an end close to the busbar to an end away from the busbar.
[0011] In one embodiment, the width of the end of the reinforcement structure connected to the busbar is in the range of 0.02 mm to 0.1 mm, and the width of the end away from the busbar is in the range of 0.02 mm to 0.2 mm.
[0012] In one embodiment, the reinforcement structure is configured as an equal-width structure toward the middle section of the main grid line, and both end sections of the reinforcement structure are also configured as equal-width structures, and the width of the middle section is smaller than the width of the both end sections.
[0013] In one embodiment, the width of the middle segment is in the range of 0.02 mm to 0.1 mm, and the width of the two end segments is in the range of 0.02 mm to 0.3 mm.
[0014] In one embodiment, the length of the overlapping portion between the end of the fine grid line and the reinforcement structure is in the range of 0.03-0.3 mm.
[0015] In one embodiment, the middle section and both end sections of the reinforcement structure are configured as equal-width structures, and the width of the middle section is greater than the width of the end sections.
[0016] In one embodiment, the width of the end portion of the fine gate line overlapping the reinforcement structure is constructed as a gradient structure, wherein the width of the end portion of the fine gate line gradually decreases from the end toward the main gate line to the end away from the main gate line, and the width of the end portion of the fine gate line is greater than the width of the middle portion of the fine gate line.
[0017] A photovoltaic assembly comprises the solar cell sheet described above.
[0018] Beneficial effects of the utility model:
[0019] The present invention provides a solar cell, which collects current on fine grid lines by arranging main grid lines on the cell, and facilitates overlapping with fine grid lines by arranging reinforcement structures on the main grid lines. In the present invention, the two ends of the fine grid lines are overlapped with the ends of two adjacent reinforcement structures, and the ends of adjacent fine grid lines overlapped on the same reinforcement structure are spaced apart, so that the main grid lines formed after screen printing are all main grid line slurry, and there is no height difference on the main grid lines, so that the welding performance of the main grid lines is better and the pull-off force is greater, thereby improving the welding performance of the solar cell. In addition, by partially disconnecting the fine grid lines at the reinforcement structure, the consumption of slurry by the fine grid can be reduced without affecting reliability, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic structural diagram of a solar cell provided in one embodiment of the present invention;
[0021] Figure 2 A schematic structural diagram of a trapezoidal reinforcement structure in a solar cell provided by one embodiment of the present utility model;
[0022] Figure 3 A schematic structural diagram of a dumbbell-shaped reinforcement structure in a solar cell provided by one embodiment of the present utility model;
[0023] Figure 4 This is a structural schematic diagram of a solar cell provided by an embodiment of the present invention in which both ends of a thin grid line are provided with a gradient structure.
[0024] Reference numerals:
[0025] Cell body 100 ; busbars 200 ; fine grid lines 300 ; reinforcement structure 400 ; middle section 410 ; and end sections 420 . DETAILED DESCRIPTION
[0026] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.
[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0029] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.
[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.
[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.
[0032] See Figures 1 to 4 An embodiment of the present invention provides a solar cell, which includes a cell body 100, a main grid line 200, a reinforcement structure 400 and a fine grid line 300. The cell body 100; a plurality of main grid lines 200 are arranged at intervals on the cell body 100, the plurality of main grid lines 200 are parallel, and the main grid lines 200 extend along a first direction; a plurality of reinforcement structures 400 are arranged at intervals on each main grid line 200, and the reinforcement structures 400 extend along a second direction; a plurality of fine grid lines 300 are arranged at intervals along the first direction, and the fine grid lines 300 extend along the second direction, and the two ends of each fine grid line 300 along the second direction are respectively overlapped with the opposite ends of two adjacent reinforcement structures 400, and the ends of two adjacent fine grid lines 300 overlapped on the same reinforcement structure 400 are spaced apart.
[0033] The present technical solution provides a solar cell, which collects the current on the fine grid lines 300 by arranging a main grid line 200 on the cell, and overlaps the fine grid lines 300 by arranging a reinforcement structure 400 on the main grid line 200. In the present invention, the two ends of the fine grid line 300 are overlapped with the ends of two adjacent reinforcement structures 400, and the ends of adjacent fine grid lines 300 overlapped on the same reinforcement structure 400 are spaced apart, so that the main grid lines 200 formed after screen printing are all filled with main grid line 200 slurry, and there is no height difference on the main grid lines 200, so that the welding performance of the main grid lines 200 is better and the pull-off force is greater, thereby improving the welding performance of the solar cell. In addition, by partially disconnecting the fine grid lines 300 at the reinforcement structure 400, the consumption of slurry by the fine grid can be reduced without affecting the reliability, thereby reducing the production cost.
[0034] like Figure 1 As shown, it can be understood that in this embodiment, multiple main grid lines 200 are parallel to each other. On the entire battery cell body 100, the reinforcement structure 400 is distributed in an array. Taking the main grid lines 200 as columns and the direction perpendicular to the main grid lines 200 as rows, the reinforcement structures 400 located on the same are located on the same straight line, so that when multiple fine grid lines 300 string the reinforcement structures 400 together, the multiple fine grid lines 300 are arranged in parallel along the first direction, and the multiple fine grid lines 300 are located on the same straight line in the second direction. Since the main grid lines 200 and the reinforcement structures 400 are printed together, the heights of the main grid lines 200 and the reinforcement structures 400 formed on the battery cell body 100 after printing are consistent. Since the fine grid lines 300 are overlapped on the reinforcement structure 400, the height of the fine grid lines 300 overlapped on the reinforcement structure 400 is slightly higher than the height of the reinforcement structure 400.
[0035] Furthermore, the busbars 200, the reinforcement structure 400 and the fine grid lines 300 are all formed on the cell body 100 by screen printing. Specifically, the busbars 200 and the reinforcement structure 400 are printed first, and then the fine grid lines 300 are printed.
[0036] like Figures 2 to 4 As shown, in one embodiment, the reinforcement structure 400 is symmetrically arranged on both sides of the busbar 200 with the busbar 200 as the symmetry axis. By arranging the reinforcement structure 400 symmetrically with the busbar 200 as the symmetry axis, on the one hand, the grid line structure of the solar cell is simplified, and on the other hand, such an arrangement facilitates the overlap of the ends of the fine grid lines 300 with the reinforcement structure 400, thereby improving the reliability of the solar cell.
[0037] like Figure 2As shown, in one embodiment, the width of the reinforcement structure 400 gradually increases from the end close to the busbar 200 to the end away from the busbar 200. Specifically, the width of the end of the reinforcement structure 400 connected to the busbar 200 ranges from 0.02mm to 0.1mm, and the width of the end away from the busbar 200 ranges from 0.02mm to 0.2mm.
[0038] In this embodiment, the reinforcement structure 400 is configured as two trapezoidal structures symmetrically arranged around the busbar 200, and the width of the trapezoidal structure at one end closer to the busbar 200 is configured to be smaller than the width at the end farther away from the busbar 200. This ensures the reliability of the connection between the fine grid lines 300 and the reinforcement structure 400 while reducing the loss of slurry caused by the reinforcement structure 400. In this way, even if the fine grid lines 300 are offset during printing, the fine grid lines 300 and the reinforcement structure 400 can still be overlapped.
[0039] like Figure 3 As shown, in one embodiment, the middle section 410 of the reinforcement structure 400 facing the busbar 200 is configured as a uniform width structure, and the end sections 420 of the reinforcement structure 400 are also configured as uniform width structures, with the width of the middle section 410 being smaller than the widths of the end sections 420. The width of the middle section 410 ranges from 0.02 mm to 0.1 mm, and the width of the end sections 420 ranges from 0.02 mm to 0.3 mm.
[0040] In this embodiment, the middle section 410 and the two end sections 420 of the main grid line 200 are set to an equal segment structure, so that the structure of the entire reinforcement structure 400 is simpler. The width of the middle section 410 is set to be smaller than the width of the two end sections 420, so that while reducing the shading area of the reinforcement structure 400, thereby improving the photoelectric conversion performance of the solar cell, the consumption of slurry by the reinforcement structure 400 can be reduced. In addition, setting the two end sections 420 wider can effectively ensure the reliability of the overlap between the fine grid line 300 and the reinforcement structure 400, and is also conducive to the molding of the fine grid line 300. For example, when the fine grid line 300 is screen-printed, even if there is a slight deviation in the alignment, the connection between the fine grid line 300 and the reinforcement structure 400 can be guaranteed, thereby ensuring the reliability of the connection between the fine grid line 300 and the main grid line 200.
[0041] In one embodiment, the length of the overlapping portion between the end of the fine grid line 300 and the reinforcement structure 400 ranges from 0.03 to 0.3 mm. The length of the overlapping portion between the end of the fine grid line 300 and the reinforcement structure 400 is set between 0.03 and 0.3 mm. While ensuring that the end of the fine grid line 300 overlaps the reinforcement structure 400, the overlapping length of the two is kept as short as possible, thereby ensuring that there is no length of the fine grid line 300 on the reinforcement structure 400. This improves the welding performance of the main grid line 200 and increases the pull-out force, thereby improving the welding performance of the solar cell.
[0042] In one embodiment, the middle section 410 and the end sections 420 of the reinforcement structure 400 are configured to have equal widths, with the middle section 410 being wider than the end sections 420. The width of the ends of the fine grid lines 300 where they overlap the reinforcement structure 400 is configured to have a gradient structure, wherein the width of the ends of the fine grid lines 300 gradually decreases from the end facing the main grid line 200 to the end facing away from the main grid line 200, and the width of the ends of the fine grid lines 300 is wider than the width of the middle portion of the fine grid lines 300.
[0043] like Figure 4 As shown, in this embodiment, the end of the fine grid line 300 is set to a gradient structure, so that the reliability of the overlap between the fine grid line 300 and the reinforcement structure 400 can be effectively guaranteed, and it is also conducive to the molding of the fine grid line 300. For example, when the fine grid line 300 is screen-printed, even if there is a slight deviation in the alignment, the connection between the fine grid line 300 and the reinforcement structure 400 can be guaranteed, thereby ensuring the reliability of the connection between the fine grid line 300 and the main grid line 200. Specifically, the gradient length range of the end of the fine grid line 300 is 0.01mm-0.1mm.
[0044] One embodiment of the present invention also provides a photovoltaic module, which includes the above solar cell. By applying the above solar cell to the photovoltaic module, by setting the main grid line 200 on the cell to collect the current on the fine grid line 300, and by setting the reinforcement structure 400 on the main grid line 200 to overlap with the fine grid line 300. In the present invention, the two ends of the fine grid line 300 are overlapped with the ends of two adjacent reinforcement structures 400 respectively, and the ends of adjacent fine grid lines 300 overlapped on the same reinforcement structure 400 are spaced apart, so that the main grid line 200 formed after screen printing is all the main grid line 200 slurry, and there is no height difference on the main grid line 200, so that the welding performance of the main grid line 200 is better and the pull-off force is greater, thereby improving the welding performance of the solar cell. In addition, by partially disconnecting the fine grid line 300 at the reinforcement structure 400, the consumption of slurry by the fine grid can be reduced without affecting the reliability, thereby reducing the production cost.
[0045] In the present invention, by adopting the solar cell with the above structure, the fine grid line 300 does not pass through the main grid line 200, and the design optimization of the reinforcement structure 400 on the main grid line 200 realizes the overlap of the fine grid line 300. In this way, the main grid line 200 is completely covered with main grid slurry, and there is no height difference on the main grid line 200, which has better welding performance and greater pull-off force. The fine grid line 300 does not pass through the main grid line 200, and the unit consumption of slurry by the fine grid line 300 can be reduced without affecting reliability, mainly because the length direction of the fine grid is shorter. Taking the solar cell model 210 as an example, the fine grid lines 300 do not pass through the main grid lines 200. The length of the fine grid lines 300 is reduced by 0.5mm at each intersection of the main grid lines 200. There are a total of 18BB main grid lines 200 and about 192 fine grid lines 300. The total saving of fine grid consumption on the front and back sides is about 5mg, which is equivalent to about 3 centimeters / W per watt. While ensuring welding performance and tensile reliability, the unit consumption cost is reduced.
[0046] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0047] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.
Claims
1. A solar cell, characterized in that: The solar cell comprises: Battery cell body; Busbars, a plurality of busbars are arranged on the cell body at intervals, the plurality of busbars are parallel, and the busbars extend along a first direction; A reinforcement structure, wherein a plurality of the reinforcement structures are arranged on each of the main grid lines at intervals, and the reinforcement structures extend along the second direction; a plurality of fine grid lines, wherein the plurality of fine grid lines are spaced apart along the first direction and extend along the second direction, wherein both ends of each fine grid line along the second direction are respectively overlapped with opposite ends of two adjacent reinforcement structures, and the ends of two adjacent fine grid lines overlapped on the same reinforcement structure are spaced apart; The height of the reinforcement structure is consistent with the height of the main grid line, and the first direction is perpendicular to the second direction.
2. The solar cell according to claim 1, wherein: The reinforcement structure is symmetrically arranged on both sides of the main grid line with the main grid line as a symmetry axis.
3. The solar cell according to claim 2, wherein: The width of the reinforcement structure gradually increases from an end close to the main grid line to an end away from the main grid line.
4. The solar cell according to claim 3, wherein: The width of the reinforcement structure at one end connected to the main grid line is in the range of 0.02 mm to 0.1 mm, and the width of the reinforcement structure at one end away from the main grid line is in the range of 0.02 mm to 0.2 mm.
5. The solar cell according to claim 2, wherein: The reinforcement structure is configured as an equal-width structure toward the middle section of the main grid line, and both end sections of the reinforcement structure are also configured as equal-width structures, with the width of the middle section being smaller than the width of the both end sections.
6. The solar cell according to claim 5, characterized in that: The width of the middle section is in the range of 0.02 mm to 0.1 mm, and the width of the two end sections is in the range of 0.02 mm to 0.3 mm.
7. The solar cell according to any one of claims 1 to 6, characterized in that: The length of the overlapping portion between the end of the thin grid line and the reinforcement structure is in the range of 0.03-0.3 mm.
8. The solar cell according to claim 2, wherein: The middle section and both end sections of the reinforcement structure are configured as equal-width structures, and the width of the middle section is greater than the width of the end sections.
9. The solar cell according to claim 8, characterized in that: The width of the end portion of the fine grid line overlapping the reinforcement structure is constructed as a gradient structure, wherein the width of the end portion of the fine grid line gradually decreases from the end toward the main grid line to the end away from the main grid line, and the width of the end portion of the fine grid line is greater than the width of the middle portion of the fine grid line.
10. A photovoltaic module, characterized in that: The photovoltaic module comprises the solar cell according to any one of claims 1 to 9.