Electrode structure and solar cell
By designing multiple solder electrodes and cross-connected main and secondary gate lines on the surface of the solar cell, the current transmission path is optimized, and the problems of long current transmission distance and high resistance are solved, and the efficiency of the solar cell is improved.
Patent Information
- Application Number
- CN202420491051.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-13
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-13
AI Technical Summary
The current transmission path of existing solar cells is single, resulting in a long current transmission distance, which is prone to the problem that the non-conducting area cannot collect current, and the resistance between the main gate electrode and the secondary gate electrode is high, which affects the current transmission efficiency.
Design an electrode structure, including distributing multiple solder electrodes on the surface of the solar cell, connecting multiple radial main gate lines and an annular secondary gate lines on the solder electrodes, and connecting the main gate lines with the secondary gate lines to reduce the secondary gate lines. The gate electrode collects the transmission distance after the current is increased and the gate preventing line is increased to enhance the current transmission capability.
By optimizing the current transmission path, reducing resistance loss, and improving the current transmission capability and efficiency of solar cells, the problems of non-conductance of a single path and high current loss are effectively solved.
Smart Images
Figure CN222168404U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaics, in particular to an electrode structure and a solar cell. Background Art
[0002] In the photovoltaic field, the existing solar cell metallization is formed by connecting multiple parallel main grids and multiple sub-grid lines arranged perpendicular to the main grids to form the electrodes of the solar cell. The current collection on the front and back of the cell is to lead the current from the inside of the silicon wafer into the main grid electrode through the sub-grid electrode, and to achieve conduction by directly overlapping the sub-grid electrode and the main grid electrode. The current collection from the silicon substrate is mainly carried out through the sub-grid electrode. The transmission distance of the current on the sub-grid electrode before entering the main grid electrode is relatively long, and the current transmission path is single, which easily leads to the situation that the corresponding non-conducting area cannot effectively collect current due to the non-conduction of the single path. Utility Model Content
[0003] Based on this, it is necessary to provide an electrode structure. The electrode structure of the utility model can optimize the current transmission and collection method of the solar cell and improve the efficiency of the solar cell.
[0004] An embodiment of the present application provides an electrode structure.
[0005] An electrode structure is distributed on the surface of a solar cell, the electrode structure comprising a plurality of welding point electrodes distributed at intervals on the surface of the solar cell, and main grid lines and auxiliary grid lines arranged corresponding to the welding point electrodes; the welding point electrodes are connected to a plurality of main grid lines distributed radially and a plurality of annular auxiliary grid lines cross-connected with the main grid lines.
[0006] In some embodiments, the welding point electrode is in a disc-shaped structure as a whole.
[0007] In some of the embodiments, the number of the welding point electrodes is 4 to 200.
[0008] In some embodiments, the plurality of welding point electrodes are distributed in a matrix of multiple rows and columns, and the welding point electrodes in each row and each column are distributed at equal intervals.
[0009] In some embodiments, one end of the busbar is connected to the soldering point electrode, and the other end of the busbar extends in a direction away from the soldering point electrode.
[0010] In some embodiments, the main grid lines conductively connected to the solder joint electrodes are distributed in an axisymmetric manner.
[0011] In some embodiments, the number of the main grid lines on each of the welding point electrodes is 4 to 20.
[0012] In some embodiments, the width of the main grid line is 10 μm to 50 μm.
[0013] In some embodiments, the auxiliary grid line is in a ring shape, and a plurality of the auxiliary grid lines are distributed in a ring shape with the welding point electrode as the center;
[0014] And / or, the plurality of secondary grid lines on each of the welding point electrodes are distributed at equal intervals.
[0015] In some embodiments, the electrode structure further includes an anti-breakage grid line, and the anti-breakage grid line is conductively connected to the outermost auxiliary grid line.
[0016] An embodiment of the present application also provides a solar cell.
[0017] A solar cell, the surface of which is evenly divided into a plurality of cell regions arranged in a matrix, and a welding point electrode is correspondingly arranged for each cell region.
[0018] The electrode structure can optimize the solar cell current transmission and collection method and improve the efficiency of the solar cell. Specifically, in the electrode structure of the present application, the transmission distance of the secondary gate electrode after collecting the current is reduced by redesigning the back main gate electrode and the secondary gate electrode. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.
[0021] FIG1 is a schematic diagram of an electrode structure according to an embodiment of the present invention;
[0022] FIG2 is a schematic diagram of a main gate electrode structure in an electrode structure according to an embodiment of the present invention;
[0023] FIG. 3 is a schematic diagram of a sub-gate electrode structure in an electrode structure according to an embodiment of the present invention.
[0024] Description of Reference Numerals
[0025] 10. Electrode structure; 100. Solder point electrode; 200. Main gate electrode; 201. Main gate line; 300. Sub-gate electrode; 301. Sub-gate line; 400. Anti-break gate line. DETAILED DESCRIPTION
[0026] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model 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 utility model. However, the utility model 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 utility model, so the utility model is not limited by 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 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 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 invention.
[0028] In the present invention, 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 the present invention can be understood according to specific circumstances.
[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0030] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0032] The present application provides an electrode structure 10 to solve at least one of the following problems: the transmission distance of the current on the auxiliary grid electrode of the solar cell of the conventional technology is relatively long, the transmission path of the current is single, which easily causes the single loop to be non-conductive, and the current in the area cannot be collected; and the main grid electrode and the auxiliary grid electrode in the conventional technology are mostly aluminum electrodes, the resistance of the grid line is high, the current loss is high, and the loss of the current in the transmission process is affected, thereby reducing the efficiency of the solar cell. The electrode structure 10 will be described below in conjunction with the accompanying drawings.
[0033] The electrode structure 10 provided in the embodiment of the present application is exemplified as shown in Fig. 1, which is a schematic diagram of the structure of the electrode structure 10 provided in the embodiment of the present application. The electrode structure 10 of the present application is applicable to a solar cell structure.
[0034] In order to more clearly illustrate the structure of the electrode structure 10, the electrode structure 10 will be introduced below in conjunction with the accompanying drawings. For example, please refer to Figure 1, which is a schematic diagram of the structure of the electrode structure 10 provided in an embodiment of the present application.
[0035] An electrode structure 10 is used to be distributed on the surface of a solar cell. The electrode structure 10 includes a welding point electrode 100, a main grid electrode 200 and a secondary grid electrode 300. There are multiple welding point electrodes 100. Multiple welding point electrodes 100 are distributed on the surface of the solar cell at intervals. The main grid electrode 200 includes multiple main grid lines 201. The secondary grid electrode 300 includes multiple secondary grid lines 301. Multiple main grid lines 201 distributed radially are connected to each welding point electrode 100. As shown in FIG. 1, at least one main grid line 201 on one welding point electrode 100 is connected to at least one main grid line 201 on the corresponding welding point electrode 100. Multiple secondary grid lines 301 are also connected to each welding point electrode 100. Multiple secondary grid lines 301 are distributed in an annular shape with the welding point electrode 100 as the center. The plurality of secondary grid lines 301 on each welding spot electrode 100 are all conductively connected to the corresponding plurality of primary grid lines 201 , as shown in FIG. 1 .
[0036] In some embodiments, the number of the welding spot electrodes 100 is 4 to 200. The number of the welding spot electrodes 100 can be set according to the specifications of the solar cell.
[0037] In some embodiments, the plurality of welding spot electrodes 100 are distributed in a matrix.
[0038] In some embodiments, the plurality of solder joint electrodes 100 are distributed in a matrix of multiple rows and columns. The plurality of solder joint electrodes 100 in each row and each column are distributed at equal intervals. For example, in one specific example, the solder joint electrodes 100 are distributed in 10 rows×10 columns. In another specific example, the solder joint electrodes 100 are distributed in 20 rows×20 columns.
[0039] Preferably, the soldering point electrodes 100 are evenly distributed at equal intervals, so that the current collected by the auxiliary gate electrode 300 can be evenly transmitted through the soldering point electrodes 100 .
[0040] In some embodiments, one end of the busbar 201 is connected to the soldering point electrode 100. The other end of the busbar 201 extends in a direction away from the soldering point electrode 100. One end of a plurality of busbars 201 are interwoven to the central soldering point electrode 100.
[0041] In some embodiments, the plurality of conductively connected busbars 201 on each soldering point electrode 100 are distributed in an axisymmetric manner.
[0042] In some embodiments, the number of the main grid lines 201 on each welding point electrode 100 is 4 to 20. For example, in a specific example, the number of the main grid lines 201 on each welding point electrode 100 is 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20. When the multiple main grid lines 201 on each welding point electrode 100 are axially symmetrically distributed, the number of the main grid lines 201 on each welding point electrode 100 is an even number. Referring to FIG. 2, FIG. 2 is a schematic diagram of the electrode structure 10 of the main grid electrode 200 in the electrode structure 10 of an embodiment of the utility model. In FIG. 2, the number of the main grid lines 201 on each welding point electrode 100 is 16, and the 16 main grid lines 201 are axially symmetrically distributed.
[0043] In some embodiments, the secondary grid line 301 is in a ring shape, and a plurality of secondary grid lines 301 are distributed in a ring shape with intervals around the soldering point electrode 100 as the center.
[0044] In some embodiments, multiple secondary grid lines 301 are equally spaced on each soldering point electrode 100. Referring to FIG3, FIG3 is a schematic diagram of the structure of the secondary grid electrode 300 in the electrode structure 10 of an embodiment of the utility model, in which multiple secondary grid lines 301 are equally spaced and concentrically distributed around the soldering point electrode 100.
[0045] In some of the embodiments, the electrode structure 10 also includes an anti-breaking grid line 400. The outermost secondary grid lines 301 of the secondary gate electrode 300 are connected to the anti-breaking grid lines 400. Preferably, the outermost secondary grid lines 301 of each secondary gate electrode 300 are connected to the anti-breaking grid lines 400, and the anti-breaking grid lines 400 of adjacent secondary gate electrodes 300 are connected to each other. The distribution rules of the anti-breaking grid lines 400 can be set according to actual needs. The present application adds a number of anti-breaking grid lines 400 to solve the problem of poor current transmission caused by incomplete printing of the main grid lines 201, and the anti-breaking grid lines 400 in the edge area can increase the current transmission capacity.
[0046] In some embodiments, the width of the anti-break gate line 400 is 50 μm-150 μm.
[0047] In some embodiments, as shown in FIG. 1 and FIG. 3 , the front or back of the solar cell is divided into a plurality of square areas of equal area, each square area is provided with a corresponding soldering point electrode 100, a main grid electrode 200 and a secondary grid electrode 300, and an anti-breaking grid line 400 is provided in the area surrounded by adjacent soldering point electrodes 100. The blank area surrounded by the plurality of main grid electrodes 200 is filled with the anti-breaking grid line 400, and the anti-breaking grid line 400 may be in a cross-line structure, and the anti-breaking grid line 400 is used to fully collect current, and the anti-breaking grid line 400 is conductively connected to the outermost annular secondary grid line 301 and / or the main grid line 201. Since the blank area surrounded by the multiple main gate electrodes 200 lacks the main gate line 201, if the annular secondary gate line 301 is not printed completely or is broken, the current transmission distance collected from the blank area surrounded by the multiple main gate electrodes 200 will become longer. Therefore, the present application adds an anti-break gate line 400. When the annular secondary gate line 301 is not printed completely or is broken, the current can be collected to the outermost circle of secondary gate lines 301 through the anti-break gate line 400, and then transported to the main gate line 201 through the secondary gate line 301, thereby playing an anti-break gate role.
[0048] In some embodiments, the anti-break grid line 400 includes one or more of an aluminum grid line, a silver grid line, a copper grid line, and a silver-aluminum grid line.
[0049] In some embodiments, the welding spot electrode 100 is a disc-shaped structure as a whole. The diameter of a single welding spot electrode 100 is 0.5 mm to 1.5 mm. For example, in one specific example, the diameter of the welding spot electrode 100 is 0.5 mm. In another specific example, the diameter of the welding spot electrode 100 is 1.5 mm. It is not difficult to understand that in other specific examples, the diameter of the welding spot electrode 100 can also be 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or other values.
[0050] In some embodiments, the width of the main grid line 201 is 10 μm to 50 μm. For example, in one specific example, the width of the main grid line 201 is 10 μm. In another specific example, the width of the main grid line 201 is 50 μm. It is not difficult to understand that in other specific examples, the width of the main grid line 201 can also be 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or other values.
[0051] In some embodiments, the soldering point electrode 100 is one or more of a silver electrode, an aluminum electrode, a copper electrode, and a silver-aluminum electrode.
[0052] In some embodiments, the material of the main gate electrode 200 is silver, aluminum, silver-aluminum alloy, or copper. The material of the secondary gate electrode 300 is one or more of silver, aluminum, silver-aluminum alloy, and copper.
[0053] An embodiment of the present application also provides a solar cell.
[0054] A solar cell comprises the above-mentioned electrode structure 10, and the electrode structure 10 is connected to the cell body. Specifically, referring to FIG1 and FIG3, the surface of the solar cell is evenly divided into a plurality of cell regions arranged in a matrix, and a single cell region is correspondingly provided with a welding point electrode (100), a main grid electrode 200 and a secondary grid electrode 300.
[0055] In summary, the electrode structure 10 of the present application can optimize the current transmission and collection method of solar cells and improve the efficiency of solar cells. In the traditional electrode grid line structure, the transmission distance of the current on the auxiliary grid electrode is relatively long, and the current transmission path is single, which easily causes a single loop to be non-conductive and the current cannot be collected. Based on this, in the electrode structure 10 of the present application, by redesigning the back main grid electrode 200 and the auxiliary grid electrode 300, the main grid line 201 is interwoven at different angles and collected on the welding point electrode 100. This design can reduce the resistance loss of the current during transmission; the main grid line 201 is evenly distributed in a radial shape, which can effectively increase the current transmission path, improve the current transmission capacity and battery efficiency. Furthermore, the design of the annular auxiliary grid electrode 300 of the present application effectively reduces the transmission distance after the auxiliary grid electrode 300 collects the current, thereby increasing the current transmission capacity of the auxiliary grid electrode 300.
[0056] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0057] 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.
[0058] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. An electrode structure (10) distributed on the surface of a solar cell, It is characterized in that The electrode structure (10) comprises a plurality of welding point electrodes (100) distributed at intervals on the surface of the solar cell, and main grid lines (201) and auxiliary grid lines (301) arranged corresponding to the welding point electrodes (100); the welding point electrodes (100) are connected to a plurality of the main grid lines (201) distributed in a radial shape, and a plurality of annular auxiliary grid lines (301) cross-connected to the main grid lines (201).
2. The electrode structure (10) according to claim 1, It is characterized in that The welding point electrode (100) is in a disc-shaped structure as a whole.
3. The electrode structure (10) according to claim 1, It is characterized in that The number of the welding point electrodes (100) is 4 to 200.
4. The electrode structure (10) according to claim 3, It is characterized in that The welding point electrodes (100) are distributed in a matrix of multiple rows and columns, and the welding point electrodes (100) in each row and each column are distributed at equal intervals.
5. The electrode structure (10) according to claim 1, It is characterized in that One end of the main grid line (201) is connected to the soldering point electrode (100), and the other end of the main grid line (201) extends in a direction away from the soldering point electrode (100).
6. The electrode structure (10) according to claim 1, It is characterized in that The main grid lines (201) conductively connected to the soldering point electrodes (100) are distributed in an axisymmetric manner.
7. The electrode structure (10) according to any one of claims 1 to 6, It is characterized in that The number of the main grid lines (201) on each of the welding point electrodes (100) is 4 to 20.
8. The electrode structure (10) according to any one of claims 1 to 6, It is characterized in that The width of the main grid line (201) is 10 μm to 50 μm.
9. The electrode structure (10) according to any one of claims 1 to 6, It is characterized in that The electrode structure (10) further comprises an anti-break grid line (400), wherein the anti-break grid line (400) is conductively connected to the outermost auxiliary grid line (301).
10. A solar cell, It is characterized in that Comprising the electrode structure (10) according to any one of claims 1 to 9, the surface of the solar cell is evenly divided into a plurality of cell regions arranged in a matrix, and a welding point electrode (100) is correspondingly arranged in each of the cell regions.