Solar cell electrode structure, solar cell and photovoltaic module

Abstract

The utility model relates to a solar cell electrode structure, a solar cell and a photovoltaic module. The solar cell electrode structure comprises a plurality of main gate electrodes which are arranged at intervals. And bonding pads are distributed on the main gate electrode. The main gate electrode is connected with a plurality of auxiliary gate electrodes which are arranged at intervals. The solar cell electrode structure further comprises branched electrode structures which are arranged at the two ends of the main gate electrode. The bifurcated electrode structure comprises a first bifurcated electrode wire and a second bifurcated electrode wire which are arranged at an interval; the first bifurcated electrode wire and the second bifurcated electrode wire are both connected with auxiliary gate electrodes, and the auxiliary gate electrodes are provided with intervals located between the first bifurcated electrode wire and the second bifurcated electrode wire. The solar cell structure can reduce the waste of the auxiliary gate electrode at the bifurcated electrode structure.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a solar cell electrode structure, a solar cell and a photovoltaic module. Background Art

[0002] The electrode structure of a solar cell is prepared by printing a conductive silver paste onto the surface of the cell, and then sintering the electrode to form an ohmic contact with the cell body.

[0003] In the electrode structure of traditional solar cells, the secondary grid electrode at the forked electrode structure runs through the forked electrode structure. In the process of making the cells into photovoltaic modules, the cells need to be connected in series through welding tapes. The welding tapes will block the secondary grid electrode at the position of the forked electrode structure, making the cell in this part unable to generate current, thereby causing waste of the secondary grid electrode in this part. Utility Model Content

[0004] Based on this, it is necessary to provide a solar cell electrode structure, a solar cell and a photovoltaic module. The solar cell electrode structure of the present application can reduce the waste of the secondary grid electrode at the bifurcated electrode structure.

[0005] In a first aspect, the present application provides a solar cell electrode structure, comprising a plurality of main grid electrodes arranged at intervals;

[0006] A pad is distributed on the main gate electrode;

[0007] The main gate electrode is connected to a plurality of spaced-apart auxiliary gate electrodes;

[0008] The solar cell electrode structure further comprises a bifurcated electrode structure, wherein the bifurcated electrode structure is arranged at both ends of the main grid electrode;

[0009] The bifurcated electrode structure comprises a first bifurcated electrode line and a second bifurcated electrode line arranged at an interval; the first bifurcated electrode line and the second bifurcated electrode line are both connected to a secondary gate electrode, and the secondary gate electrode has a gap between the first bifurcated electrode line and the second bifurcated electrode line.

[0010] In some embodiments, a plurality of parallel and spaced auxiliary gate electrodes are connected to the first bifurcated electrode line and the second bifurcated electrode line.

[0011] In some embodiments, the intervals between adjacent sub-gate electrodes gradually increase in a direction from one end of the bifurcated electrode structure connected to the main gate electrode to one end of the bifurcated electrode structure away from the main gate electrode.

[0012] In some embodiments, the first bifurcated electrode line and the second bifurcated electrode line are arranged in parallel.

[0013] In some embodiments, the main gate electrodes are arranged in parallel, and the extending direction of the first forked electrode line and the second forked electrode line is the same as the extending direction of the main gate electrode.

[0014] In some embodiments, the auxiliary gate electrodes are arranged in parallel, and the auxiliary gate electrodes are perpendicular to the main gate electrode.

[0015] In some embodiments, the distance between the first bifurcated electrode line and the second bifurcated electrode line is 1.6 mm to 2 mm.

[0016] In some embodiments, two ends of the main gate electrode are connected to the pads, and the bifurcated electrode structure is connected to the pads.

[0017] In a second aspect, the present application provides a solar cell comprising any of the solar cell electrode structures described above.

[0018] In a third aspect, the present application provides a photovoltaic module, comprising the above-mentioned solar cell.

[0019] In the above-mentioned solar cell electrode structure, the first forked electrode line and the second forked electrode line are both connected to a secondary grid electrode, and the secondary grid electrode has a gap between the first forked electrode line and the second forked electrode line. When the battery cell having the solar cell electrode structure is welded by a welding strip, the welding strip between the first forked electrode line and the second forked electrode line can be arranged at the gap between the first forked electrode line and the second forked electrode line, which is located at the secondary grid electrode, that is, the surface of the battery covered by the welding strip between the first forked electrode line and the second forked electrode line is not provided with a secondary grid electrode. The solar cell structure of the present application can reduce the waste of the secondary grid electrode at the forked electrode structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic diagram of a solar cell electrode structure provided in one embodiment of the present application;

[0021] FIG. 2 is a partially enlarged schematic structural diagram of a solar cell electrode structure provided in an embodiment of the present application.

[0022] Description of Reference Numerals

[0023] 10. Main gate electrode; 20. Sub-gate electrode; 30. Pad; 40. Forked electrode structure; 41. First forked electrode line; 42. Second forked electrode line; 50. Interval. DETAILED DESCRIPTION

[0024] 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.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 1 and 2 , an embodiment of the present application provides a solar cell electrode structure, including a plurality of main grid electrodes 10 arranged at intervals. A pad 30 is distributed on the main grid electrode 10. A plurality of sub-grid electrodes 20 arranged at intervals are connected to the main grid electrode 10. The solar cell electrode structure also includes a forked electrode structure 40, which is arranged at both ends of the main grid electrode 10. The forked electrode structure 40 includes a first forked electrode line 41 and a second forked electrode line 42 arranged at intervals; the first forked electrode line 41 and the second forked electrode line 42 are both connected to the sub-grid electrode 20, and the sub-grid electrode 20 has a gap 50 between the first forked electrode line 41 and the second forked electrode line 42.

[0030] In the above-mentioned solar cell electrode structure, the first forked electrode line 41 and the second forked electrode line 42 are both connected to the auxiliary grid electrode 20, and the auxiliary grid electrode 20 has a gap 50 between the first forked electrode line 41 and the second forked electrode line 42. When the battery cell having the solar cell electrode structure is welded by a welding strip, the welding strip between the first forked electrode line 41 and the second forked electrode line 42 can be set at the gap 50 between the first forked electrode line 41 and the second forked electrode line 42 of the auxiliary grid electrode 20, that is, the surface of the battery covered by the welding strip between the first forked electrode line 41 and the second forked electrode line 42 is not provided with the auxiliary grid electrode 20. The solar cell structure of the present application can reduce the waste of the auxiliary grid electrode 20 at the forked electrode structure 40.

[0031] In some embodiments, a plurality of auxiliary gate electrodes 20 arranged in parallel and at intervals are connected to the first forked electrode line 41 and the second forked electrode line 42 .

[0032] In some embodiments, the interval 50 between adjacent sub-gate electrodes 20 gradually increases in a direction from one end of the forked electrode structure 40 connected to the main gate electrode 10 to one end of the forked electrode structure 40 away from the main gate electrode 10 .

[0033] Exemplarily, referring to FIG. 2 , the X direction in FIG. 2 is the direction from one end of the forked electrode structure 40 connected to the main gate electrode 10 to one end of the forked electrode structure 40 away from the main gate electrode 10 .

[0034] After using the welding ribbon to weld the solar cell, if the welding ribbon contacts the secondary grid electrode 20 located at the position of the bifurcated electrode structure 40, it may cause excessive force at the contact point between the welding ribbon and the secondary grid electrode 20 during the component lamination, thereby causing the bifurcated electrode structure 40 to break. At the same time, the farther the welding ribbon is from the main grid electrode 10, that is, the closer it is to the edge of the cell, the easier it is for its position to deviate from the center position. From the end of the bifurcated electrode structure 40 connected to the main grid electrode 10 to the end of the bifurcated electrode structure 40 away from the main grid electrode 10, the interval 50 on the adjacent secondary grid electrodes 20 gradually increases, which can reduce the risk of contact between the welding ribbon and the secondary grid electrode 20 during the welding process.

[0035] In some embodiments, the intervals 50 between adjacent sub-gate electrodes 20 increase linearly in a direction from one end of the forked electrode structure 40 connected to the main gate electrode 10 to one end of the forked electrode structure 40 away from the main gate electrode 10 .

[0036] In some embodiments, the midpoint of the interval 50 on each auxiliary gate electrode 20 is located on the central axis of the first forked electrode line 41 and the second forked electrode line 42 along the length direction thereof.

[0037] In some embodiments, the size of the interval 50 between the first forked electrode line 41 and the second forked electrode line 42 of the auxiliary gate electrode 20 is smaller than the distance between the first forked electrode line 41 and the second forked electrode line 42 .

[0038] For the battery end, the opening spacing of the forked electrode structure 40, that is, the distance between the first forked electrode line 41 and the second forked electrode line 42 is often much larger than the diameter of the welding strip. If the auxiliary grid electrode 20 between the first forked electrode line 41 and the second forked electrode line 42 is completely disconnected, that is, the size of the interval 50 of the auxiliary grid electrode 20 between the first forked electrode line 41 and the second forked electrode line 42 is equal to the distance between the first forked electrode line 41 and the second forked electrode line 42, it is easy to cause the current generated by the surface between the first forked electrode line 41 and the second forked electrode line 42 that can receive sunlight to be unable to be better collected. Therefore, by using the non-completely disconnected auxiliary grid electrode 20, that is, the size of the interval 50 of the auxiliary grid electrode 20 between the first forked electrode line 41 and the second forked electrode line 42 is smaller than the distance between the first forked electrode line 41 and the second forked electrode line 42, it is more conducive to the collection and transmission of current, and the efficiency loss of the battery end can be reduced, which is more matched with the power of the component end.

[0039] In some embodiments, the first bifurcated electrode line 41 and the second bifurcated electrode line 42 are arranged in parallel.

[0040] In some embodiments, the main gate electrodes 10 are arranged in parallel, and the extending direction of the first forked electrode line 41 and the second forked electrode line 42 is the same as the extending direction of the main gate electrode 10 .

[0041] In the electrode structure of traditional solar cells, the bifurcated electrode structure is printed and produced together with the auxiliary grid electrode during printing and screen making. The preparation process of the auxiliary grid electrode adopts a knotless process. Since the extension direction of the bifurcated electrode structure is inconsistent with the extension direction of the auxiliary grid electrode, the wire drawing can only be performed in one direction when making the knotless screen, so the knotless production can only be performed in the area of ​​the auxiliary grid electrode, and the knotless production cannot be performed at the position of the bifurcated electrode structure. This can easily cause the bifurcated electrode structure to be wavy, resulting in a longer transmission distance when the current at the position of the bifurcated electrode structure is gathered on the main grid electrode, and the line resistance increases, which in turn causes a loss in the efficiency of the battery cell.

[0042] In the present application, the extension direction of the first forked electrode line 41 and the second forked electrode line 42 is the same as the extension direction of the main grid electrode 10, and the first forked electrode line 41 and the second forked electrode line 42 are straight lines parallel to each other. In the process of printing and screen making, the first forked electrode line 41 and the second forked electrode line 42 can be printed and made together with the main grid electrode 10. The extension direction of the first forked electrode line 41 and the second forked electrode line 42 is the same as the extension direction of the main grid electrode 10. In the process of screen making, the main grid electrode 10 and the forked electrode structure 40 can both be prepared using a knot-free process, which can reduce the transmission distance when the current at the position of the forked electrode structure 40 is gathered on the main grid electrode 10, thereby improving the efficiency of the battery cell.

[0043] In some embodiments, the sub-gate electrodes 20 are arranged in parallel, and the sub-gate electrodes 20 are perpendicular to the main gate electrode 10 .

[0044] In some embodiments, the distance between the first forked electrode line 41 and the second forked electrode line 42 is 1.6 mm to 2 mm. Optionally, the distance between the first forked electrode line 41 and the second forked electrode line 42 is 1.6 mm, 1.61 mm, 1.62 mm, 1.63 mm, 1.64 mm, 1.65 mm, 1.67 mm, 1.69 mm, 1.7 mm, 1.72 mm, 1.74 mm, 1.76 mm, 1.78 mm, 1.8 mm, 1.82 mm, 1.84 mm, 1.86 mm, 1.88 mm, 1.9 mm, 1.92 mm, 1.94 mm, 1.95 mm, 1.96 mm, 1.97 mm, 1.98 mm, 1.99 mm or 2 mm. Alternatively, the distance between the first forked electrode line 41 and the second forked electrode line 42 may also be within the range between any two of the above distances.

[0045] In some embodiments, the length of the first bifurcated electrode line 41 is 6.9 mm to 7.2 mm. Optionally, the length of the first bifurcated electrode line 41 is 6.9 mm, 6.91 mm, 6.92 mm, 6.93 mm, 6.94 mm, 6.95 mm, 6.97 mm, 6.99 mm, 7 mm, 7.02 mm, 7.04 mm, 7.06 mm, 7.08 mm, 7.1 mm, 7.12 mm, 7.14 mm, 7.16 mm, 7.17 mm, 7.18 mm, 7.19 mm or 7.2 mm. Alternatively, the length of the first bifurcated electrode line 41 may also be within the range between any two of the above lengths.

[0046] In some embodiments, the length of the second bifurcated electrode line 42 is 6.9 mm to 7.2 mm. Optionally, the length of the second bifurcated electrode line 42 is 6.9 mm, 6.91 mm, 6.92 mm, 6.93 mm, 6.94 mm, 6.95 mm, 6.97 mm, 6.99 mm, 7 mm, 7.02 mm, 7.04 mm, 7.06 mm, 7.08 mm, 7.1 mm, 7.12 mm, 7.14 mm, 7.15 mm, 7.16 mm, 7.17 mm, 7.18 mm, 7.19 mm or 7.2 mm. Alternatively, the length of the second bifurcated electrode line 42 may also be within the range between any two of the above lengths.

[0047] In some embodiments, the length of the first bifurcated electrode line 41 is equal to the length of the second bifurcated electrode line 42 .

[0048] In some embodiments, the width of the first forked electrode line 41 is 0.025 mm to 0.03 mm. Optionally, the width of the first forked electrode line 41 is 0.025 mm, 0.0252 mm, 0.0254 mm, 0.0256 mm, 0.0258 mm, 0.026 mm, 0.0264 mm, 0.0268 mm, 0.027 mm, 0.0274 mm, 0.0278 mm, 0.028 mm, 0.0284 mm, 0.0288 mm, 0.029 mm, 0.0292 mm, 0.0294 mm, 0.0296 mm, 0.0298 mm or 0.03 mm. Alternatively, the width of the first forked electrode line 41 may also be within the range between any two of the above widths.

[0049] In some embodiments, the width of the second bifurcated electrode line 42 is 0.025 mm to 0.03 mm. Optionally, the width of the second bifurcated electrode line 42 is 0.025 mm, 0.0252 mm, 0.0254 mm, 0.0256 mm, 0.0258 mm, 0.026 mm, 0.0264 mm, 0.0268 mm, 0.027 mm, 0.0274 mm, 0.0278 mm, 0.028 mm, 0.0284 mm, 0.0288 mm, 0.029 mm, 0.0292 mm, 0.0294 mm, 0.0296 mm, 0.0298 mm or 0.03 mm. Alternatively, the width of the second bifurcated electrode line 42 may also be within the range between any two of the above widths.

[0050] In some embodiments, two ends of the main gate electrode 10 are connected to the pads 30 , and the bifurcated electrode structure 40 is connected to the pads 30 .

[0051] Yet another embodiment of the present application provides a solar cell, comprising any of the above-mentioned solar cell electrode structures.

[0052] Yet another embodiment of the present application provides a photovoltaic module, comprising the above-mentioned solar cell.

[0053] 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.

[0054] 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: It comprises a plurality of main grid electrodes (10) arranged at intervals; A welding pad (30) is distributed on the main gate electrode (10); The main gate electrode (10) is connected to a plurality of spaced-apart auxiliary gate electrodes (20); The solar cell electrode structure further comprises a bifurcated electrode structure (40), wherein the bifurcated electrode structure (40) is arranged at two ends of the main grid electrode (10); The bifurcated electrode structure (40) comprises a first bifurcated electrode line (41) and a second bifurcated electrode line (42) which are arranged at an interval; the first bifurcated electrode line (41) and the second bifurcated electrode line (42) are both connected to a secondary gate electrode (20), and the secondary gate electrode (20) has a gap (50) between the first bifurcated electrode line (41) and the second bifurcated electrode line (42).

2. The solar cell electrode structure according to claim 1, characterized in that: The first forked electrode line (41) and the second forked electrode line (42) are connected to a plurality of auxiliary grid electrodes (20) arranged in parallel and at intervals.

3. The solar cell electrode structure according to claim 2, characterized in that: In a direction from one end of the bifurcated electrode structure (40) connected to the main gate electrode (10) to one end of the bifurcated electrode structure (40) away from the main gate electrode (10), the interval (50) on adjacent sub-gate electrodes (20) gradually increases.

4. The solar cell electrode structure according to claim 1, characterized in that: The first bifurcated electrode line (41) and the second bifurcated electrode line (42) are arranged in parallel.

5. The solar cell electrode structure according to claim 4, characterized in that: The main grid electrodes (10) are arranged in parallel, and the extension direction of the first forked electrode line (41) and the second forked electrode line (42) is the same as the extension direction of the main grid electrode (10).

6. The solar cell electrode structure according to claim 5, characterized in that: The auxiliary gate electrodes (20) are arranged in parallel, and the auxiliary gate electrodes (20) are perpendicular to the main gate electrode (10).

7. The solar cell electrode structure according to claim 4, characterized in that: The distance between the first bifurcated electrode line (41) and the second bifurcated electrode line (42) is 1.6 mm to 2 mm.

8. The solar cell electrode structure according to any one of claims 1 to 7, characterized in that: The two ends of the main gate electrode (10) are connected to the pads (30), and the bifurcated electrode structure (40) is connected to the pads (30).

9. A solar cell, characterized in that: The invention comprises the solar cell electrode structure as claimed in any one of claims 1 to 8.

10. A photovoltaic module, characterized in that: Comprising the solar cell as claimed in claim 9.

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