Solar cell electrode structure and solar cell
Through the design of the ring main gate line and multiple main gate connection lines, combined with the equal-array spacing arrangement of the secondary gate line, the problem of excessive current transmission distance in the traditional solar cell electrode structure is solved, and the current transmission capability and collection efficiency are improved.
Patent Information
- Application Number
- CN202420570862.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-19
AI Technical Summary
In traditional solar cell electrode structures, the distance from the main gate line to the pad is relatively long, resulting in unsatisfactory current transmission capability.
Design a ring-shaped main gate line enclosure is arranged on the outer periphery of the pad, and set at the same radian intervals with the pad as the center point through multiple main gate connection lines and secondary gate lines, so as to shorten the distance from the main gate line to the pad. Improve current transmission capability.
The current transmission distance is shortened, the current transmission capacity is improved, the impact of welding on the main gate line is reduced, and the current collection capacity is improved.
Smart Images
Figure CN222214188U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of photovoltaic technology, and in particular to a solar cell electrode structure and a solar cell. Background Art
[0002] In the design of the electrode structure of traditional solar cells, electrodes are formed by connecting multiple parallel main grid lines and multiple secondary grid lines arranged perpendicular to the main grid lines, and the pads are connected to the main grid lines. The solar cell contacts the silicon substrate through the secondary grid lines, and the current is extracted from the inside of the silicon wafer. After the current is transmitted from the secondary grid lines to the main grid lines, it is transmitted from the main grid lines to the pads. The photovoltaic module collects the current collected on the pads through the welding strips.
[0003] In the traditional solar cell electrode structure, the transmission distance of current from the main grid line to the pad is long, and the current transmission capacity is not ideal. Utility Model Content
[0004] Based on this, it is necessary to provide a solar cell electrode structure and a solar cell. In the solar cell electrode structure of the present application, the transmission distance of the current from the main grid line to the welding pad is short, and the current transmission capacity is strong.
[0005] In a first aspect, the present application provides a solar cell electrode structure, including: a main grid line, a welding pad and a secondary grid line;
[0006] The main grid line is annular and is arranged around the periphery of the pad, and the main grid line is conductively connected to the pad;
[0007] The auxiliary grid lines are arranged in a radial shape around the periphery of the main grid lines, and the auxiliary grid lines are conductively connected to the main grid lines.
[0008] In some embodiments, the solar cell electrode structure further includes a main grid connection line;
[0009] There is a gap between the main grid line and the pad, the main grid connection line is arranged between the main grid line and the pad, and the main grid connection line is conductively connected to the main grid line and the pad.
[0010] In some embodiments, there are multiple main grid connection lines, and the multiple main grid connection lines are arranged between the main grid lines and the pads at intervals.
[0011] In some embodiments, a plurality of the main grid connection lines are arranged between the main grid line and the pad at equal arc intervals with the pad as the center point.
[0012] In some embodiments, the secondary grid lines are arranged around the periphery of the main grid lines in a radial shape with the pad as the center point and at equal arc intervals.
[0013] In some embodiments, the width of the main grid line is 0.5 mm to 1 mm.
[0014] In some embodiments, the radius of the pad is 1 mm to 2 mm.
[0015] In some embodiments, the radial distance between the main grid line and the pad is 1 mm to 10 mm.
[0016] In some embodiments, the number of the busbars and the pads are both multiple, each busbar and the corresponding pad conductively connected thereto form a group, and multiple groups of busbars and the corresponding pads are distributed in an array.
[0017] In some implementation methods, the number of the secondary grid lines connected to each of the primary grid lines is 4 to 20.
[0018] In some embodiments, the solar cell electrode structure further includes a secondary grid connection line, and the secondary grid connection line is conductively connected to different secondary grid lines.
[0019] In a second aspect, the present application provides a solar cell comprising any of the solar cell electrode structures described above.
[0020] In the above-mentioned solar cell electrode structure, the main grid line is annular and arranged around the periphery of the pad, and the main grid line and the pad are electrically connected. Compared with the traditional solar cell electrode structure in which the pad is overlapped on the long strip of main grid line, the solar cell electrode structure of the present application can make the transmission distance of current from the main grid line to the pad shorter, thereby achieving a stronger current transmission capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG1 is a schematic diagram of a partial structure of an electrode structure provided in one embodiment of the present application;
[0022] FIG2 is a schematic diagram of a partial structure of an electrode structure provided in one embodiment of the present application;
[0023] FIG3 is a schematic diagram of an electrode structure provided in one embodiment of the present application;
[0024] FIG. 4 is a schematic diagram of the structure of a conventional electrode structure.
[0025] Description of Reference Numerals
[0026] 10. Main grid line; 20. Solder pad; 30. Main grid connection line; 40. Sub-grid line; 50. Sub-grid connection line. DETAILED DESCRIPTION
[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0029] In the description of the present application, 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 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0032] As shown in FIG1 , the present application provides a solar cell electrode structure, including: a main grid line 10, a pad 20 and a secondary grid line 40. The main grid line 10 is annular and is arranged around the periphery of the pad 20, and the main grid line 10 is conductively connected to the pad 20. The secondary grid line 40 is arranged around the periphery of the main grid line 10 in an radiating shape, and the secondary grid line 40 is conductively connected to the main grid line 10.
[0033] As shown in Figure 4, Figure 4 is a partial schematic diagram of a traditional solar cell electrode structure. In the traditional solar cell electrode structure, the main grid line is in the shape of a long strip, and the pad is directly overlapped on the main grid line. In the above-mentioned solar cell electrode structure, the main grid line 10 is annular and is arranged around the periphery of the pad 20, and the main grid line 10 and the pad 20 are conductively connected. By surrounding the main grid line 10 around the periphery of the pad 20, compared with the traditional solar cell electrode structure in which the pad is directly overlapped on the long strip of the main grid line, the solar cell electrode structure of the present application can make the transmission distance of the current from the main grid line 10 to the pad 20 shorter, thereby achieving a stronger current transmission capability.
[0034] 2 , in some embodiments, the solar cell electrode structure further includes a main grid connection line 30. There is a gap between the main grid line 10 and the pad 20, and the main grid connection line 30 is disposed between the main grid line 10 and the pad 20, and the main grid connection line 30 is conductively connected to the main grid line 10 and the pad 20.
[0035] It is understandable that the pad 20 in the solar cell electrode structure is used for welding the welding strip in the subsequent preparation of the photovoltaic module, and different cells are connected through the welding strip. There is a gap between the main grid line 10 and the welding pad 20, and the main grid line 10 and the welding pad 20 are connected by the main grid connection line 30 arranged between the main grid line 10 and the welding pad 20, and the current collected on the main grid line 10 is further transmitted to the welding pad 20 through the main grid connection line 30, which can reduce the impact of welding on the main grid line 10 when the welding strip and the welding pad are connected by welding.
[0036] In some embodiments, there are multiple main grid connection lines 30 , and the multiple main grid connection lines 30 are arranged between the main grid line 10 and the pad 20 at intervals.
[0037] A plurality of main grid connection lines 30 are disposed at intervals between the main grid lines 10 and the pads 20 , and can provide a plurality of current transmission paths for transmitting current from the main grid lines 10 to the pads 20 , thereby improving the current collection capability.
[0038] In some embodiments, the pad 20 is circular, the main grid line 10 is annular, and the pad 20 and the main grid line 10 are arranged in concentric circles.
[0039] The pad 20 is circular, the main grid line 10 is annular, and the pad 20 and the main grid line 10 are arranged in concentric circles, so that the lengths of the main grid connection lines 30 can be equal, so that the current is evenly collected from the main grid line 10 to the pad 20 .
[0040] In some embodiments, a plurality of main grid connection lines 30 are arranged between the main grid line 10 and the pad 20 at equal arc intervals with the pad 20 as the center point.
[0041] Multiple main grid connection lines 30 are evenly distributed in equal arcs with the pad 20 as the center point. While providing multiple current transmission paths for current transmission from the main grid line 10 to the pad 20, it is also possible to achieve a shorter transmission distance when current is transmitted from the main grid line 10 to the pad 20 from each main grid connection line 30.
[0042] It should be noted that the multiple main grid connection lines 30 are arranged at equal arc intervals with the pad 20 as the center point, which means that the extension lines of the multiple main grid connection lines 30 all pass through the center of the pad 20, and the angles between adjacent main grid connection lines 30 are equal. Taking the circular pad 20 as an example, the multiple main grid connection lines 30 are evenly distributed, which means that the extension lines of the multiple main grid connection lines 30 all pass through the center of the pad 20, and the angles between adjacent main grid connection lines 30 are equal.
[0043] In some embodiments, the secondary grid lines 40 are arranged around the main grid lines 10 in a radial shape with equal arc intervals around the pad 20 as the center point.
[0044] In some embodiments, the busbar line 10 is overlapped on the surface of the busbar connection line 30 .
[0045] It can be understood that the busbar line 10 overlaps the surface of the busbar connection line 30 , that is, the busbar line 10 covers a portion of the surface of the busbar connection line 30 .
[0046] In some embodiments, the width of the main grid line 10 is 0.5 mm to 1 mm. Optionally, the width of the main grid line 10 is 0.5 mm, 0.52 mm, 0.54 mm, 0.56 mm, 0.58 mm, 0.6 mm, 0.62 mm, 0.64 mm, 0.66 mm, 0.68 mm, 0.7 mm, 0.72 mm, 0.74 mm, 0.76 mm, 0.78 mm, 0.8 mm, 0.82 mm, 0.84 mm, 0.86 mm, 0.88 mm, 0.9 mm, 0.92 mm, 0.94 mm, 0.96 mm, 0.98 mm or 1 mm. Alternatively, the width of the main grid line 10 may also be within the range between any two of the above widths.
[0047] In some embodiments, the radius of the pad 20 is 1 mm to 2 mm. Optionally, the radius of the pad 20 is 1 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm, 1.25 mm, 1.3 mm, 1.35 mm, 1.4 mm, 1.45 mm, 1.5 mm, 1.55 mm, 1.6 mm, 1.65 mm, 1.7 mm, 1.75 mm, 1.8 mm, 1.85 mm, 1.9 mm, 1.95 mm or 2 mm. Alternatively, the radius of the pad 20 may also be within the range between any two of the above radii.
[0048] In some embodiments, the radial distance between the busbar 10 and the pad 20 is 1 mm to 10 mm.
[0049] Referring again to FIG. 2 , illustratively, a in FIG. 2 is the radial distance between the main grid line 10 and the pad 20 .
[0050] Within the radial distance range between the main grid line 10 and the pad 20, the transmission distance of the current from the main grid line 10 to the pad 20 can be shortened, thereby increasing the current transport capacity of the current collected from the main grid line 10 to the pad 20, and can also reduce the amount of slurry caused by the main grid line 10 and the main grid connection line 30. Optionally, the radial distance between the main grid line 10 and the pad 20 is 1mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm. Alternatively, the radial distance between the main grid line 10 and the pad 20 can also be within the range between any two of the above distances.
[0051] 3 , in some embodiments, there are multiple busbars 10 and pads 20 , each busbar 10 and the corresponding pad 20 conductively connected thereto form a group, and multiple groups of busbars 10 and corresponding pads 20 are distributed in an array.
[0052] In some embodiments, the number of the pads 20 is 5×5 to 20×20. Optionally, the number of the pads 20 is 5×5, 6×6, 7×7, 8×8, 9×9, 10×10, 11×11, 12×12, 13×13, 14×14, 15×15, 16×16, 17×17, 18×18, 19×19, or 20×20.
[0053] In some embodiments, the distances between adjacent pads 20 in the column direction are equal.
[0054] In some embodiments, in the row direction, the distances between adjacent pads 20 are equal.
[0055] In some implementations, each main grid line 10 is connected to a plurality of secondary grid lines 40 ; each secondary grid line 40 is connected to a different main grid line 10 .
[0056] In some embodiments, each main grid line 10 is connected to a plurality of secondary grid lines 40 , and the plurality of secondary grid lines 40 connected to the same main grid line 10 are evenly distributed with equal arcs.
[0057] It should be noted that the uniform distribution of equal arcs between the multiple secondary grid lines 40 connected to the same main grid line 10 means that the extension lines of the multiple secondary grid lines 40 all pass through the center point of the pad 20, and the angles between adjacent secondary grid lines 40 are equal. Taking the circular main grid line 10 as an example, the uniform distribution of the multiple secondary grid lines 40 connected to the same main grid line 10 means that the extension lines of the multiple secondary grid lines 40 all pass through the center of the main grid line 10, and the angles between adjacent secondary grid lines 40 are equal.
[0058] In some embodiments, the number of the secondary grid lines 40 connected to each main grid line 10 is 4 to 20. Optionally, the number of the secondary grid lines 40 connected to each main grid line 10 is 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.
[0059] In some embodiments, eight secondary grid lines 40 are connected to each main grid line 10 , and the angles between the multiple secondary grid lines 40 connected to the same main grid line 10 are all 45°.
[0060] In some embodiments, the solar cell electrode structure further includes a secondary grid connection line 50 , and the secondary grid connection line 50 connects different secondary grid lines 40 .
[0061] By connecting different sub-grid lines 40 through the sub-grid connection line 50, the transmission path after current collection can be increased, and the current collection capability can be improved. When a local gate break occurs, the sub-grid connection line 50 can provide an additional current transmission path, which can reduce the problem of ineffective current collection in the local area due to the gate break.
[0062] In some embodiments, the width of the secondary grid line 40 is 50 μm to 200 μm. Optionally, the width of the secondary grid line 40 is 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm or 200 μm. Alternatively, the width of the secondary grid line 40 may also be within the range between any two of the above widths.
[0063] In some embodiments, the width of the secondary gate connection line 50 is 50 μm to 200 μm. Optionally, the width of the secondary gate connection line 50 is 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm, 195 μm or 200 μm. Alternatively, the width of the secondary gate connection line 50 may also be within the range between any two of the above widths.
[0064] The present application provides a solar cell, comprising any of the solar cell electrode structures described above.
[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.
[0066] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims, and the description and drawings may be used to interpret the contents of the claims.
Claims
1. A solar cell electrode structure, characterized in that: include: A main grid line (10), a welding pad (20) and a secondary grid line (40); The main grid line (10) is annular and is arranged around the periphery of the pad (20), and the main grid line (10) is conductively connected to the pad (20); The auxiliary grid lines (40) are arranged in a radial shape around the periphery of the main grid lines (10), and the auxiliary grid lines (40) are conductively connected to the main grid lines (10).
2. The solar cell electrode structure according to claim 1, characterized in that: The solar cell electrode structure also includes a main grid connection line (30); There is a gap between the main grid line (10) and the pad (20), the main grid connection line (30) is arranged between the main grid line (10) and the pad (20), and the main grid connection line (30) is conductively connected to the main grid line (10) and the pad (20).
3. The solar cell electrode structure according to claim 1 or 2, characterized in that: A plurality of main grid connection lines (30) are arranged between the main grid line (10) and the pad (20) at equal arc intervals with the pad (20) as the center point; and / or, The secondary grid lines (40) are arranged around the periphery of the main grid lines (10) in a radially equiradian manner with the soldering pad (20) as the center point.
4. The solar cell electrode structure according to claim 3, characterized in that: The width of the main grid line (10) is 0.5 mm to 1 mm; and / or, The radius of the pad (20) is 1 mm to 2 mm; and / or, The radial distance between the main grid line (10) and the pad (20) is 1 mm to 10 mm.
5. The solar cell electrode structure according to claim 1, 2 or 4, characterized in that: The number of the main grid lines (10) and the number of the pads (20) are both multiple, each main grid line (10) and the corresponding pad (20) conductively connected thereto form a group, and multiple groups of the main grid lines (10) and the corresponding pads (20) are distributed in an array.
6. The solar cell electrode structure according to claim 3, characterized in that: The number of the main grid lines (10) and the number of the pads (20) are both multiple, each main grid line (10) and the corresponding pad (20) conductively connected thereto form a group, and multiple groups of the main grid lines (10) and the corresponding pads (20) are distributed in an array.
7. The solar cell electrode structure according to claim 1, 2 or 4, characterized in that: The number of the secondary grid lines (40) connected to each of the primary grid lines (10) is 4 to 20.
8. The solar cell electrode structure according to claim 3, characterized in that: The number of the secondary grid lines (40) connected to each of the primary grid lines (10) is 4 to 20.
9. The solar cell electrode structure according to claim 1, 2 or 4, characterized in that: The solar cell electrode structure further comprises a secondary grid connection line (50), wherein the secondary grid connection line (50) is conductively connected to different secondary grid lines (40).
10. A solar cell, characterized in that: The invention comprises the solar cell electrode structure as claimed in any one of claims 1 to 9.