Solar cell electrode structure and cell piece

Abstract

The utility model relates to a solar cell electrode structure and a cell piece. The solar cell electrode structure comprises a first electrode structure and a second electrode structure, and the first electrode structure and the second electrode structure are arranged at an interval. The first electrode structure comprises a plurality of first grid lines arranged at intervals, and the widths of the adjacent first grid lines are different. The second electrode structure comprises first block-shaped electrodes and second grid lines, the second grid lines are of broken line structures, and the two ends of each second grid line are connected with the first block-shaped electrodes respectively. According to the solar cell electrode structure, the first electrode structure and the second electrode structure can be tested, the advantages and disadvantages of the manufacturing process of the copper interconnection solar cell can be conveniently and quantitatively represented, the verification and troubleshooting time is saved, and the efficiency is improved.

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] Copper interconnect solar cell technology refers to: first chemical vapor deposition of seed layer copper on indium tin oxide (ITO) conductive film, then pattern transfer and electroplating of grid lines on the seed layer, after electroplating of copper grid lines, a layer of protective tin is plated using chemical tin plating. The use of electroplated copper and tin grid lines can replace the screen printing silver grid line solution. This technology is a fusion of silicon heterojunction solar cell production and metal electroplating technology. In copper interconnect solar cell technology, copper electrode grid lines are realized by pattern transfer, electroplating, and film removal on photosensitive resin. In the entire process, when the process conditions of a certain process need to be changed, it may affect the subsequent process and cause abnormalities. At this time, the traditional inspection method requires a lot of time to gradually verify and troubleshoot the process, which seriously restricts the efficiency of the copper interconnect solar cell technology route. Utility Model Content

[0003] Based on this, it is necessary to provide a solar cell electrode structure and a cell. By testing the solar cell electrode structure of the present application, it is convenient to quantitatively characterize the quality of the copper interconnect solar cell process, save verification and troubleshooting time, and improve efficiency.

[0004] In a first aspect, the present application provides a solar cell electrode structure, including a first electrode structure and a second electrode structure, wherein the first electrode structure and the second electrode structure are arranged at an interval;

[0005] The first electrode structure includes a plurality of first gate lines arranged at intervals, and the widths of adjacent first gate lines are different;

[0006] The second electrode structure includes a first block electrode and a second gate line. The second gate line has a folded line structure, and two ends of the second gate line are respectively connected to the first block electrode.

[0007] In some embodiments, the first gate lines are distributed in multiple rows, each row includes multiple first gate lines, and the first gate lines in each row are distributed in parallel;

[0008] In each row of the plurality of first gate lines, the width of the first gate lines decreases or increases in a gradient from the middle position to the first and last two end positions.

[0009] In some embodiments, in each row of the first gate lines, a difference in width between adjacent first gate lines is 1 μm-3 μm.

[0010] In some embodiments, at least one of the second gate lines and at least two of the first block electrodes constitute a test group, and the second electrode structure includes a plurality of the test groups, and the test groups are spaced apart in a row.

[0011] In some embodiments, the second electrode structure further includes a connecting gate line, and the connecting gate line is used to connect adjacent test groups; two ends of the connecting gate line are respectively connected to the first block electrodes in different test groups.

[0012] In some embodiments, the solar cell electrode structure further includes a third electrode structure, and the third electrode structure is spaced apart from the first electrode structure and the second electrode structure;

[0013] The third electrode structure includes a plurality of third gate lines arranged at intervals. The third gate lines are distributed in a plurality of rows. The third gate lines in each row have the same width; the third gate lines in different rows have different widths.

[0014] In some embodiments, in each row of the third gate lines, the third gate lines are arranged in parallel and at equal intervals.

[0015] In some embodiments, the solar cell electrode structure further includes a fourth electrode structure, and the fourth electrode structure is spaced apart from the first electrode structure and the second electrode structure;

[0016] The fourth electrode structure includes a plurality of second block electrodes that are distributed at intervals, and the plurality of second block electrodes are distributed in an array.

[0017] In some embodiments, the fourth electrode structure includes a plurality of second block electrodes of different sizes;

[0018] The second block electrodes of the same size form a square array.

[0019] In a second aspect, the present application also provides a solar cell comprising any of the solar cell electrode structures described above.

[0020] The above-mentioned solar cell electrode structure includes a first electrode structure and a second electrode structure, wherein the first electrode structure includes a plurality of first grid lines arranged at intervals, and the widths of adjacent first grid lines are different. After preparing the solar cell electrode structure including the first electrode structure, the line widths of the first grid lines of different widths in the first electrode structure can be detected to determine the difference between the actual prepared line width and the designed line width of the first grid lines of different designed line widths, thereby being able to characterize the graphic resolution of the solar cell electrode structure preparation process, that is, the thinning capability of the solar cell electrode structure preparation process. At the same time, the second electrode structure includes a first block electrode and a second grid line, the second grid line has a fold line structure, and the two ends of the second grid line are respectively connected to the first block electrode. After preparing the solar cell electrode structure including the second electrode structure, the first block electrode can be used as a resistance test point to test the continuity and resistivity of the second grid line with a fold line structure, thereby determining whether there is a broken grid or a virtual break in the electroplating route, thereby being able to characterize the preparation effect of the solar cell electrode structure preparation process on the grid line with a fold line structure. The solar cell electrode structure of the present application can be used to test the first electrode structure and the second electrode structure, so as to facilitate quantitative characterization of the quality of the manufacturing process of the copper interconnected solar cell, save verification and troubleshooting time, and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic structural diagram of a first electrode structure provided in one embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a second electrode structure provided in one embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a third electrode structure provided in one embodiment of the present application;

[0024] Figure 4 A schematic structural diagram of a fourth electrode structure provided in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of a battery cell provided in yet another embodiment of the present application.

[0026] Description of Reference Numerals

[0027] 1. First electrode structure; 10. First gate line; 2. Second electrode structure; 21. First block electrode; 22. Second gate line; 23. Connecting gate line; 3. Third electrode structure; 31. Third gate line; 4. Fourth electrode structure; 41. Second block electrode. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Reference Figure 1~2As shown, the present application provides a solar cell electrode structure, including a first electrode structure 1 and a second electrode structure 2, wherein the first electrode structure 1 and the second electrode structure 2 are arranged at intervals. The first electrode structure 1 includes a plurality of first grid lines 10 arranged at intervals, and the widths of adjacent first grid lines 10 are different. The second electrode structure 2 includes a first block electrode 21 and a second grid line 22, wherein the second grid line 22 has a fold line structure, and the first block electrodes 21 are connected to both ends of the second grid line 22, respectively.

[0034] The above-mentioned solar cell electrode structure includes a first electrode structure 1 and a second electrode structure 2, wherein the first electrode structure 1 includes a plurality of first grid lines 10 arranged at intervals, and the widths of adjacent first grid lines 10 are different. After preparing the solar cell electrode structure including the first electrode structure 1, the line widths of the first grid lines 10 of different widths in the first electrode structure 1 can be detected to determine the difference between the actual prepared line width and the designed line width of the first grid lines 10 of different designed line widths, and then the graphic resolution of the solar cell electrode structure preparation process can be characterized, that is, the thinning capability of the solar cell electrode structure preparation process. It is understandable that the thinning capability of the process of copper interconnect solar cells is usually determined by the selection of photosensitive resin, developer, printer, electroplating machine and electroplating solution.

[0035] At the same time, the second electrode structure 2 includes a first block electrode 21 and a second grid line 22, the second grid line 22 has a zigzag structure, and the two ends of the second grid line 22 are respectively connected to the first block electrode 21. After preparing the solar cell electrode structure including the second electrode structure 2, the first block electrode 21 can be used as a resistance test point to test the continuity and resistivity of the second grid line 22 with a zigzag structure, so as to determine whether there is a broken grid or a virtual break in the electroplating route, and then the preparation effect of the solar cell electrode structure preparation process on the grid line with a zigzag structure can be characterized. The solar cell electrode structure of the present application can be conveniently quantitatively characterized for the advantages and disadvantages of the process of the copper interconnect solar cell by testing the first electrode structure 1 and the second electrode structure 2, saving time for verification and troubleshooting and improving efficiency.

[0036] In some embodiments, the width of the first gate line 10 is 10 μm to 26 μm. Optionally, the width of the first gate line 10 is 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm or 26 μm. Alternatively, the width of the first gate line 10 may also be within the range between any two of the above widths.

[0037] In some embodiments, the first gate lines 10 are distributed in multiple rows, each row includes multiple first gate lines 10, and the first gate lines 10 in each row are distributed in parallel. Among the multiple first gate lines 10 in each row, the width gradient of the first gate lines 10 decreases or increases from the middle position to the first and last ends.

[0038] It is understandable that, among the multiple first grid lines 10 in each row, from the middle position to the end position direction, the width gradient of the first grid line 10 is reduced, that is, in the row, if the number of the first grid lines 10 is an odd number, the width of the first grid line 10 located in the middle position is the widest, and if the number of the first grid lines 10 is an even number, the width of the two first grid lines 10 located in the middle position is the widest. And the width of the first grid lines 10 in the two sides is reduced one by one. Exemplarily, when the number of the first grid lines 10 in a row is 9, the width of the 5th first grid line 10 in the row is the widest, from the 5th first grid line 10 to the 1st first grid line 10, the width of the first grid line 10 is reduced one by one, and from the 5th first grid line 10 to the 9th first grid line 10, the width of the first grid line 10 is reduced one by one. Similarly, among the multiple first grid lines 10 in each row, from the middle position to the end position direction, the width gradient of the first grid line 10 increases and also conforms to the above explanation.

[0039] In some embodiments, in each row of first gate lines 10 , the difference in width between adjacent first gate lines 10 is 1 μm-3 μm.

[0040] Within the range of the difference in width between the adjacent first gate lines 10, it is convenient to characterize the graphic resolution when the process prepares the first gate lines 10 of different widths. Optionally, the difference in width between the adjacent first gate lines 10 is 1μm, 1.2μm, 1.4μm, 1.6μm, 1.8μm, 2μm, 2.2μm, 2.4μm, 2.6μm, 2.8μm or 3μm. Alternatively, the difference in width between the adjacent first gate lines 10 can also be within the range between any two of the above width differences.

[0041] In some implementations, in each row of first gate lines 10 , the first gate lines 10 are distributed in parallel and at equal intervals.

[0042] In some embodiments, at least one second gate line 22 and at least two first block electrodes 21 constitute a test group, and the second electrode structure 2 includes a plurality of test groups, each of which is distributed in a row at intervals.

[0043] In some embodiments, the second electrode structure 2 further includes a connecting gate line 23, and the connecting gate line 23 is used to connect adjacent test groups; two ends of the connecting gate line 23 are respectively connected to the first block electrodes 21 in different test groups.

[0044] The two ends of the connecting gate line 23 are respectively connected to the first block electrodes 21 in different test groups, so as to conveniently characterize the electroplating continuity and resistance of the gate line when the electroplating machine electroplates continuous turning line segments.

[0045] In some of these embodiments, the second gate line 22 has a "C"-shaped structure. It can be understood that the second gate line 22 with a "C"-shaped structure includes a first connecting portion and a second connecting portion. The number of the second connecting portions is two. One end of each second connecting portion is connected to the first block-shaped electrode 21, and the other end is connected to the second connecting portion. The two ends of the second connecting portion are respectively connected to the two first connecting portions. The two first connecting portions are arranged in parallel.

[0046] In some of these embodiments, the first block-shaped electrode 21 has a square structure.

[0047] In some of these embodiments, the interval between adjacent first connecting portions is 3 mm to 7 mm. Optionally, the interval between adjacent first connecting portions is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm or 7 mm. Or, the interval between adjacent first connecting portions can also be within the range between any two of the above intervals.

[0048] In some of these embodiments, the length of the first connecting portion is 10 mm to 30 mm. Optionally, the length of the first connecting portion is 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 24 mm, 26 mm, 28 mm or 30 mm. Or, the length of the first connecting portion can also be within the range between any two of the above lengths.

[0049] In some of these embodiments, the width of the second gate line 22 is 10 μm to 20 μm. Optionally, the width of the second gate line 22 is 10 μm, 12 μm, 14 μm, 16 μm, 18 μm or 20 μm. Or, the width of the second gate line 22 can also be within the range between any two of the above widths.

[0050] Referring to Figure 3 As shown, in some of these embodiments, the solar cell electrode structure further includes a third electrode structure 3. The third electrode structure 3 and the first electrode structure 1 and the second electrode structure 2 are arranged at intervals. The third electrode structure 3 includes a plurality of third gate lines 31 arranged at intervals. The third gate lines 31 are distributed in multiple rows. In each row of the third gate lines 31, the widths of the third gate lines 31 are the same; the widths of the third gate lines 31 in different rows are different.

[0051] The third electrode structure 3 includes a plurality of third gate lines 31 arranged at intervals. The third gate lines 31 are distributed in multiple rows. In each row of the third gate lines 31, the widths of the third gate lines 31 are the same; the widths of the third gate lines 31 in different rows are different. After preparing the solar cell electrode structure including the third electrode structure 3, the contact resistivity of the gate lines with different line widths can be tested.

[0052] In some embodiments, in each row of third gate lines 31 , the third gate lines 31 are arranged in parallel and at equal intervals.

[0053] In some embodiments, the width of the third gate line 31 is 12 μm to 60 μm. Optionally, the width of the third gate line 31 is 12 μm, 16 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 50 μm or 60 μm. Alternatively, the width of the third gate line 31 may also be within the range between any two of the above widths.

[0054] Reference Figure 4 As shown, in some embodiments, the solar cell electrode structure further includes a fourth electrode structure 4, which is spaced apart from the first electrode structure 1 and the second electrode structure 2. The fourth electrode structure 4 includes a plurality of spaced apart second block electrodes 41, which are distributed in an array.

[0055] The fourth electrode structure 4 includes a plurality of second block electrodes 41 distributed at intervals, and the plurality of second block electrodes 41 are distributed in an array. After the solar cell electrode structure including the fourth electrode structure 4 is prepared, the adhesion of the block electrodes can be tested.

[0056] In some embodiments, the fourth electrode structure 4 includes a plurality of second block electrodes 41 of different sizes. The second block electrodes 41 of the same size form a square array.

[0057] In some embodiments, the second block-shaped electrodes 41 have a square structure.

[0058] In some embodiments, the side length of the second block electrode 41 is 2 μm to 10 μm. Optionally, the side length of the second block electrode 41 is 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm. Alternatively, the side length of the second block electrode 41 may also be within the range between any two of the above side lengths.

[0059] In some embodiments, the number of the second block electrodes 41 in a square array is 5×5 to 10×10. Optionally, the number of the second block electrodes 41 in a square array is 5×5, 6×6, 7×7, 8×8, 9×9 or 10×10.

[0060] Yet another embodiment of the present application provides a solar cell comprising any of the above-mentioned solar cell electrode structures.

[0061] In one embodiment, the solar cell comprises a solar cell body and a solar cell electrode structure, and the solar cell electrode structure is arranged on the surface of the solar cell body. The solar cell electrode structure comprises a plurality of first electrode structures 1, a plurality of second electrode structures 2, a plurality of third electrode structures 3 and a plurality of fourth electrode structures 4, and each of the first electrode structures 1, the second electrode structures 2, the third electrode structures 3 and the fourth electrode structures 4 are distributed at intervals.

[0062] Reference Figure 5 As shown, in some embodiments, the region where each third electrode structure 3 is located is the first region, the region between adjacent first regions is the second region, each second region includes a plurality of third regions spaced apart in a row, and each third region is distributed with the first electrode structure 1, the second electrode structure 2, and the fourth electrode structure 4. The first electrode structure 1, the second electrode structure 2, and the fourth electrode structure 4 in each third region are spaced apart in a row.

[0063] In some embodiments, in adjacent third regions, the first electrode structure 1 , the second electrode structure 2 , and the fourth electrode structure 4 are arranged in different ways.

[0064] It is understandable that the row direction is perpendicular to the column direction. The cell including the above-mentioned solar cell electrode structure can facilitate different tests on different areas of the cell, and can better feedback the local and overall conditions, so as to better characterize the specific conditions of different areas, and can effectively quantitatively characterize the pros and cons of the entire process. Optionally, the number of the third electrode structure 3 is 2 to 10. The number of the first electrode structure 1, the second electrode structure 2 and the fourth electrode structure 4 is the same, which is 4 to 40.

[0065] Refer again Figure 5 As shown, in one embodiment, exemplarily, the battery cell includes five third electrode structures 3, the number of third regions in each second region is four, and each third region is distributed with one first electrode structure 1, one second electrode structure 2 and one fourth electrode structure 4.

[0066] 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.

[0067] 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: Comprising a first electrode structure (1) and a second electrode structure (2), wherein the first electrode structure (1) and the second electrode structure (2) are arranged at an interval; The first electrode structure (1) comprises a plurality of first gate lines (10) arranged at intervals, and adjacent first gate lines (10) have different widths; The second electrode structure (2) comprises a first block electrode (21) and a second gate line (22); the second gate line (22) has a folded line structure, and both ends of the second gate line (22) are respectively connected to the first block electrode (21).

2. The solar cell electrode structure according to claim 1, characterized in that: The first gate lines (10) are distributed in a plurality of rows, each row comprising a plurality of the first gate lines (10), and the first gate lines (10) in each row are distributed in parallel; In each row of the plurality of first gate lines (10), the width of the first gate lines (10) decreases or increases in a gradient from the middle position to the first and last end positions.

3. The solar cell electrode structure according to claim 2, characterized in that: In each row of the first gate lines (10), the difference in width between adjacent first gate lines (10) is 1 μm to 3 μm.

4. The solar cell electrode structure according to claim 1, characterized in that: At least one of the second gate lines (22) and at least two of the first block electrodes (21) form a test group, and the second electrode structure (2) comprises a plurality of the test groups, each of the test groups being arranged in a row and spaced apart.

5. The solar cell electrode structure according to claim 4, characterized in that: The second electrode structure (2) further comprises a connecting gate line (23), the connecting gate line (23) being used to connect adjacent test groups; two ends of the connecting gate line (23) are respectively connected to the first block electrodes (21) in different test groups.

6. The solar cell electrode structure according to any one of claims 1 to 5, characterized in that: The solar cell electrode structure further comprises a third electrode structure (3), wherein the third electrode structure (3) is arranged at intervals from the first electrode structure (1) and the second electrode structure (2); The third electrode structure (3) comprises a plurality of third gate lines (31) arranged at intervals, the third gate lines (31) being distributed in a plurality of rows, the third gate lines (31) in each row having the same width, and the third gate lines (31) in different rows having different widths.

7. The solar cell electrode structure according to claim 6, characterized in that: In each row of the third grid lines (31), the third grid lines (31) are arranged in parallel and at equal intervals.

8. The solar cell electrode structure according to any one of claims 1 to 5, characterized in that: The solar cell electrode structure further comprises a fourth electrode structure (4), wherein the fourth electrode structure (4) is arranged at intervals from the first electrode structure (1) and the second electrode structure (2); The fourth electrode structure (4) comprises a plurality of second block electrodes (41) distributed at intervals, and the plurality of second block electrodes (41) are distributed in an array.

9. The solar cell electrode structure according to claim 8, characterized in that: The fourth electrode structure (4) comprises a plurality of second block electrodes (41) of different sizes; The second block electrodes (41) of the same size form a square array.

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

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