Solar cell piece, solar cell and electric device
By adjusting the gate line structure on the solar cell, the thin gate is located on the inside and the main gate is located on the outside, and connected through overlapping wire segments, the problem of poor connection reliability between the main gate and the thin gate is solved, and the reliability and yield of the cell are improved.
Patent Information
- Application Number
- CN202421526101.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-06-28
AI Technical Summary
In the prior art, the connection reliability between the main gate and the thin gate is poor, and the gate breakage phenomenon is prone to occur during the welding of the component end.
By adjusting the gate line structure of the solar cell, the thin gate is arranged on the inside, the main gate is arranged on the outside, and connected through overlapping wire segments, the risk of gate breakage caused by welding problems at the component end is avoided.
提高了主栅与细栅的连接可靠性,提升了电池片的湿热可靠性测试的良品率,避免了主、细栅搭接不好的问题。
Smart Images
Figure CN223040502U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic cells, and in particular to a solar cell, a solar cell and an electrical device. Background Art
[0002] In the related art, the connection method between the main grid and the fine grid of the mass-produced crystalline silicon solar cells on the market is generally as follows: first, the main grid is printed, and then the fine grid is printed. The connecting wire segment and the connecting wire of the main grid or the Pad point (the metal contact point on the solar cell) are overlapped, and the connecting wire segment will be overlapped on the connecting wire of the main grid or the Pad point.
[0003] Currently, due to the sometimes insufficient accuracy of the alignment between the main grid and the fine grid, during the high-temperature process of welding at the component end, it may directly fuse the connection at the tangent of the fine grid and the main grid, resulting in the phenomenon of broken grid at the component end. Summary of the Utility Model
[0004] In view of this, the purpose of this application is to provide a solar cell, a solar cell and an electrical device, which are used to solve the technical problem of poor connection reliability between the main grid and the fine grid existing in the prior art.
[0005] To achieve the above purpose, this application provides the following technical solutions:
[0006] In the first aspect, this application provides a solar cell, at least one side of the cell is provided with a grid line structure, and the grid line structure includes:
[0007] Fine grid, printed on the corresponding side of the cell along the first direction;
[0008] Main grid, printed on the side of the cell where the fine grid is printed along the second direction, and overlapped with the fine grid on the outer side of the fine grid facing away from the cell;
[0009] Wherein, the main grid and the fine grid are connected by corresponding connecting wire segments.
[0010] According to some embodiments of this application, the grid line structure further includes:
[0011] PAD point, arranged at a partial overlapping part of the main grid and the fine grid, used to conduct the main grid and the fine grid and used to connect the welding tape.
[0012] According to some embodiments of this application, the connecting wire segment includes:
[0013] The first connecting wire segment is used to connect the main grid and the fine grid;
[0014] The second jumper wire segment is used to connect the PAD point and the fine grid, wherein the PAD point is electrically connected to the main grid;
[0015] Wherein, the width of the first jumper wire segment is less than the width of the second jumper wire segment, and / or, the length of the first jumper wire segment is less than the length of the second jumper wire segment.
[0016] According to some embodiments of the present application, the width range of the main grid is 20-200 microns, and the width range of the fine grid is 5-20 microns.
[0017] Wherein, the first end of the first jumper wire segment is connected to the fine grid; the second end of the first jumper wire segment is connected to the main grid, and the length range of the second end of the first jumper wire segment extending into the main grid along the width direction of the main grid is 0-20 microns.
[0018] According to some embodiments of the present application, the width range of the first jumper wire segment is 10-50 microns.
[0019] According to some embodiments of the present application, the width range of the main grid is 20-200 microns, and the width range of the fine grid is 5-20 microns; the length range of the PAD point is 800-1000 microns, and the width range is 500-800 microns.
[0020] Wherein, the first end of the second jumper wire segment is connected to the fine grid; the second end of the second jumper wire segment is connected to the PAD point, and the length range of the second end of the jumper wire segment extending into the PAD point along the length direction of the PAD point is 20-500 microns.
[0021] According to some embodiments of the present application, the width range of the second jumper wire segment is 10-50 microns.
[0022] According to some embodiments of the present application, the jumper wire segment is one of a rectangular jumper wire segment, a trapezoidal jumper wire segment, and a triangular jumper wire segment.
[0023] In a second aspect, the present application provides a solar cell, which includes the solar cell sheet described in the embodiments of the present application.
[0024] In a third aspect, the present application provides an electrical device, which includes: the solar cell sheet described in the embodiments of the present application or the solar cell described in the embodiments of the present application.
[0025] In the above technical solution, a solar cell is provided. By adjusting the printing positions of the fine grid and the main grid, the fine grid is first formed on the solar cell, and then the main grid is set (the main grid is located outside compared to the fine grid), so as to avoid the risk of broken grid due to welding problems at the component end. In addition, based on this design method of the solar cell, problems such as poor overlap between the main grid and the fine grid can be avoided, and the quality of the overall grid structure can also be improved, thereby increasing the yield rate of the damp heat reliability test of the cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.
[0027] Figure 1 is a schematic diagram of the grid structure of a solar cell shown according to an exemplary embodiment.
[0028] In the figure: 101, fine grid; 102, main grid; 103, PAD point; 104, second connection segment; 105, first connection segment. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0029] The present application will be further described in detail below with reference to the drawings and embodiments. Through these descriptions, the features and advantages of the present application will become more clearly defined.
[0030] The special term "exemplary" here means "serving as an example, embodiment, or illustrative". Any embodiment described as "exemplary" here does not have to be construed as superior to or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.
[0031] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0032] In related technologies, the commercially mass-produced crystalline silicon solar cells in the market are mainly PERC (Passivated Emitter and Rear Cell) and TOPCon (Thin Oxide Passivated Contact). Whether it is a PERC or TOPCon cell, in order to ensure good soldering at the module end, the overlapping method of the main grid and the fine grid generally is to print the main grid first and then print the fine grid. At the overlapping part of the main grid and the fine grid, the grid lines of the fine grid are thickened. These thickened lines are called overlapping line segments, which can also be called centipede feet or tapered lines. The overlapping line segments will overlap with the connecting line of the main grid or the Pad point (the metal contact point on the solar cell). The overlapping line segments will be placed on the connecting line of the main grid or the Pad point.
[0033] In actual production, in order to control production costs, the overlapping line segments will slightly overlap with the connecting line of the main grid or the Pad point. If the alignment accuracy between the main grid and the fine grid is sometimes insufficient and there is a slight deviation, it may cause one side of the overlapping line segment of the fine grid to overlap too much on the main grid, while the other side just touches the main grid tangentially. Therefore, during the high-temperature process of soldering at the module end, it may directly fuse the connection at the tangential part between the fine grid and the main grid, resulting in the phenomenon of broken grid at the module end.
[0034] This application provides a solar cell. By changing the grid line structure of the solar cell, the fine grid is set inside (relative to the main grid, closer to the solar cell at the corresponding overlapping part), and the main grid is set outside (relative to the fine grid, farther from the solar cell at the corresponding overlapping part). Using this grid line structure for the solar cell can solve the above problems.
[0035] The technical solutions of this embodiment will be elaborated in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and implementation manners can be combined with each other.
[0036] In an exemplary embodiment of the present utility model, a solar cell is provided, as Figure 1 shown, Figure 1 is a schematic diagram of the grid line structure of a solar cell shown according to an exemplary embodiment. At least one side of the solar cell is provided with a grid line structure. The grid line structure includes: a fine grid 101, a main grid 102, an overlapping line segment, etc. The fine grid 101 is printed on the corresponding side of the cell along the first direction; the main grid 102 is printed on the side of the cell where the fine grid 101 is printed along the second direction, and overlaps with the fine grid 101 on the outer side of the fine grid 101 facing away from the cell; wherein, the main grid 102 and the fine grid 101 are connected by corresponding overlapping line segments.
[0037] In this exemplary embodiment, the printing positions of the main grid 102 and the fine grid 101 are adjusted to form a grid line structure of "the main grid 102 on the outside and the fine grid 101 on the inside" on the solar cell. This grid line structure can be achieved by adjusting the grid line printing sequence. Specifically, since the pastes used for the main grid 102 and the fine grid 101 have different corrosion effects on the passivation film on the surface of the cell, the fine grid 101 will completely corrode through the passivation film on the surface of the cell, while the paste for the main grid 102 slightly corrodes the passivation film on the surface of the cell. Therefore, according to the different corrosion effects of the pastes on the passivation layer of the cell, the fine grid 101 can be printed on the surface of the cell first, and then the paste for the main grid 102 is printed. When using the traditional method of printing the main grid 102 first and then the fine grid 101, the paste of the fine grid 101 will be blocked by the paste of the main grid 102 at the overlapping section of the connection line and the main grid 102. At this time, the paste of the fine grid 101 overlapping on the main grid 102 cannot corrode the passivation layer, which may lead to the risk of broken grid at the component end due to welding problems. The solar cell in this application can avoid the occurrence of the above problems. In addition, the metallization overlapping method (grid line structure) formed by the solar cell in this embodiment also has certain benefits for the subsequent component damp heat reliability test, avoiding the problem of poor overlap between the main and fine grids 101 and improving the production yield.
[0038] It should be noted that the first preset direction and the second preset direction are not parallel so that the main grid 102 and the fine grid 101 can intersect and overlap, for example: the first preset direction and the second preset direction are perpendicular, etc.
[0039] In some exemplary embodiments, the grid line structure further includes: PAD points 103, which are arranged at some overlapping positions of the main grid 102 and the fine grid 101, and are used to conduct the main grid 102 and the fine grid 101 and to connect the welding tape.
[0040] In this embodiment, by arranging PADs at corresponding positions, the electrical connection between the main grid 102 and the fine grid 101 can be achieved, and it is convenient to connect the welding tape. It should be noted that the position and quantity of the PAD points 103 can be designed according to actual needs. In the extreme case, one PAD point 103 can be set, or the quantity of PAD points 103 equal to the quantity of the overlapping positions of the fine grid 101 and the main grid 102 can be set.
[0041] In some exemplary embodiments, for the first connecting wire segment 105 directly connecting the main grid 102 and the fine grid 101, and the second connecting wire segment 104 which is arranged by setting a PAD point 103 at the overlapping part of the main grid 102 and the fine grid 101 and then connecting them, their structures can be the same or different. Considering that the area of the PAD point 103 is relatively large, the connecting wire segments can be appropriately thickened and lengthened. Exemplarily, the connecting wire segments include: a first connecting wire segment 105 for connecting the main grid 102 and the fine grid 101; and a second connecting wire segment 104 for connecting the PAD point 103 and the fine grid 101, where the PAD point 103 is electrically connected to the main grid 102. Among them, the width of the first connecting wire segment 105 is less than the width of the second connecting wire segment 104, and the length of the first connecting wire segment 105 is less than the length of the second connecting wire segment 104.
[0042] In some exemplary embodiments, the width range of the main grid 102 is 20 - 200 microns, and the width range of the fine grid 101 is 5 - 20 microns. Among them, the first end of the first connecting wire segment 105 is connected to the fine grid 101; the second end of the first connecting wire segment 105 is connected to the main grid 102, and the length range that the second end of the first connecting wire segment 105 extends into the main grid 102 along the width direction of the main grid 102 is 0 - 20 microns. The width range of the first connecting wire segment 105 is 10 - 50 microns.
[0043] Exemplarily, for an N-type single-crystal solar main grid 102 and fine grid 101 overlapping metallization structure (grid line structure), the first end of the first connecting wire segment 105 is connected to the fine grid 101, the second end of the first connecting wire segment 105 extends under the main grid 102 and the depth into the main grid 102 is 10 microns, and the width of the first connecting wire segment 105 is 50 microns. The printing method used to prepare this grid line structure is to print the fine grid 101 first and then print the main grid 102.
[0044] Exemplarily, for an N-type single-crystal solar main grid 102 and fine grid 101 overlapping metallization structure (i.e., grid line structure), the first end of the first connecting wire segment 105 is connected to the fine grid 101, the second end of the first connecting wire segment 105 extends under the main grid 102 and the depth into the main grid 102 is 20 microns, and the width of the first connecting wire segment 105 is 50 microns. The printing method used to prepare this grid line structure is to print the fine grid 101 first and then print the main grid 102.
[0045] In some exemplary embodiments, the width of the main grid 102 ranges from 20 to 200 microns, and the width of the fine grid 101 ranges from 5 to 20 microns; the length of the PAD point 103 ranges from 800 to 1000 microns, and the width ranges from 500 to 800 microns. Among them, the first end of the second jumper wire segment 104 is connected to the fine grid 101, the second end of the second jumper wire segment 104 is connected to the PAD point 103, and the second end of the jumper wire segment extends into the PAD point 103 along the length direction of the PAD point 103 by a length ranging from 20 to 500 microns. The width of the second jumper wire segment 104 ranges from 10 to 50 microns.
[0046] Exemplarily, for a metalized structure (grid line structure) where the main grid 102 and the fine grid 101 of an N-type single-crystal solar cell are overlapped, the first end of the second jumper wire segment 104 is connected to the fine grid 101, the second end of the second jumper wire segment 104 extends under the PAD point 103 and the depth into the PAD point 103 is 50 microns, and the width of the first jumper wire segment 105 is 40 microns. The printing method used to prepare this grid line structure is to print the fine grid 101 first and then the main grid 102.
[0047] Exemplarily, for a metalized structure (grid line structure) where the main grid 102 and the fine grid 101 of an N-type single-crystal solar cell are overlapped, the first end of the second jumper wire segment 104 is connected to the fine grid 101, the second end of the second jumper wire segment 104 extends under the PAD point 103 and the depth into the PAD point 103 is 500 microns, and the width of the first jumper wire segment 105 is 40 microns. The printing method used to prepare this grid line structure is to print the fine grid 101 first and then the main grid 102.
[0048] In some exemplary embodiments, the jumper wire segment is one of a rectangular jumper wire segment, a trapezoidal jumper wire segment, and a triangular jumper wire segment.
[0049] In this embodiment, the jumper wire segment (including the first jumper wire segment 105 and / or the second jumper wire segment 104) with one end connected to the fine grid 101 has its other end under the main grid 102. The shape of this jumper wire segment is rectangular, triangular, trapezoidal, or composed of other shapes (such as a rectangle plus a triangle, etc.). The length of the jumper wire segment ranges from 500 to 2000 microns, the depth of the jumper wire segment into the main grid 102 ranges from 0 to 500 microns, the width of the jumper wire segment ranges from 10 to 50 microns, and the number of jumper wire segments can be equal to the number of fine grids 101, and the number is generally between 100 and 300. By adjusting the printing sequence from first printing the main grid 102 and then the fine grid 101 to first printing the fine grid 101 and then the main grid 102, the risk of broken grids due to welding problems at the component end can be avoided. This metalized overlapping method formed by this printing method is also beneficial for the damp heat reliability test of the battery cell and can avoid problems with poor overlap between the main and fine grids 101.
[0050] In an exemplary embodiment of the present utility model, a solar cell is provided, and the cell includes any one of the above-mentioned solar cell wafers.
[0051] In an exemplary embodiment of the present utility model, an electrical device is provided, and the electrical device includes: any one of the above-mentioned solar cell wafers or any one of the above-mentioned solar cells.
[0052] It should be noted that the electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle or an extended-range electric vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiments of the present application do not impose special restrictions on the above-mentioned electrical devices.
[0053] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship in the working state of the present application, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0054] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "coupling" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.
[0055] The present application has been described in combination with preferred embodiments above, but these embodiments are only exemplary and only serve an illustrative purpose. On this basis, various substitutions and improvements can be made to the present application, and these all fall within the protection scope of the present application.
Claims
1. A solar cell, characterized in that: At least one side of the cell is provided with a grid line structure, and the grid line structure includes: Fine grids, printed on corresponding sides of the battery sheet along a first direction; A main grid is printed along the second direction on the side of the cell where the fine grid is printed, and overlaps with the fine grid on the outer side of the fine grid facing away from the cell; Wherein, the main grid and the fine grid are connected via corresponding overlapping wire segments.
2. The solar cell according to claim 1, characterized in that: The gate line structure further includes: A PAD point is arranged at a part of the overlap between the main grid and the fine grid, and is used to conduct the main grid and the fine grid and to connect a welding strip.
3. The solar cell according to claim 2, characterized in that: The lap wire segment comprises: A first bonding wire segment, used to connect the main grid and the fine grid; A second bonding line segment is used to connect the PAD point and the fine grid, wherein the PAD point is electrically connected to the main grid; Wherein, the width of the first overlapping line segment is smaller than the width of the second overlapping line segment, and / or the length of the first overlapping line segment is smaller than the length of the second overlapping line segment.
4. The solar cell according to claim 3, characterized in that: The main grid width ranges from 20 to 200 microns, and the fine grid width ranges from 5 to 20 microns. The first end of the first overlapped line segment is connected to the fine grid; the second end of the first overlapped line segment is connected to the main grid, and the second end of the first overlapped line segment extends into the main grid along the width direction of the main grid by a length ranging from 0 to 20 microns.
5. The solar cell according to claim 4, characterized in that: The width of the first overlapping line segment ranges from 10 to 50 microns.
6. The solar cell according to claim 3, characterized in that: The main grid width ranges from 20 to 200 microns, the fine grid width ranges from 5 to 20 microns; the length range of the PAD point is from 800 to 1000 microns, and the width range is from 500 to 800 microns. The first end of the second overlapped line segment is connected to the fine grid; the second end of the second overlapped line segment is connected to the PAD point, and the length of the second end of the overlapped line segment extending into the PAD point along the length direction of the PAD point ranges from 20 to 500 microns.
7. The solar cell according to claim 6, characterized in that: The width of the second overlapping line segment is in the range of 10 to 50 microns.
8. The solar cell according to any one of claims 1 to 7, characterized in that: The lap line segment is one of a rectangular lap line segment, a trapezoidal lap line segment and a triangular lap line segment.
9. A solar cell, characterized in that: The battery comprises the solar cell sheet according to any one of claims 1 to 8.
10. An electrical device, characterized in that: The electrical device comprises: the solar cell sheet according to any one of claims 1 to 8 or the solar cell according to claim 9.