Solar cell
By designing multiple sets of disconnected grid lines and special-shaped welding tapes on solar cells, the limitations on cell performance of the number of welding tapes and shading area are solved, and higher light absorption and performance improvements are achieved.
Patent Information
- Application Number
- CN202422184256.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The performance of existing solar cells is limited by the number of welding tapes and the shading area and cannot be further improved.
Multiple groups of disconnected gate line groups and special-shaped welding tapes are designed in different directions, increasing the number of welding tapes to more than 28 or less than 78, reducing the barrier area of the gate line and optimizing the welding tape spacing, and using special-shaped welding tapes to improve light utilization.
By reducing carrier motion paths and occlusion, the light absorption area and performance of the cell are improved and cost-effective.
Smart Images
Figure CN223142397U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cell manufacturing, in particular to a solar cell. Background Art
[0002] In the manufacturing process of solar cells, after the cell wafers are fabricated, the cell wafers need to be finally welded by welding tapes. Generally speaking, when the number of welding tapes of the cell wafers is small and the distance between the welding tapes is large, the path for carriers to converge to the welding tapes is long, and electrons are easily lost. When the number of welding tapes of the cell wafers is large, the shielding of the cell wafers by the welding tapes is large, which is not conducive to the efficiency of the cell wafers. In the prior art, most of them are provided with no more than 28 welding tapes at the continuous grid lines (as Figure 1 shown), Figure 1 in which, the horizontal ones are the continuous grid lines 1, and the vertical ones are 28 welding tapes 2. In the prior art, setting no more than 28 welding tapes is to make the shielding of the cell wafers by the welding tapes and the electron loss reach a relative balance, so the performance of the cell wafers cannot be further improved. Summary of the Utility Model
[0003] An object of the first aspect of the utility model is to provide a solar cell wafer, which solves the problem that the performance of the cell wafers in the prior art is limited.
[0004] In particular, the utility model provides a solar cell, comprising:
[0005] A plurality of cell wafers, each of the cell wafers comprises a plurality of groups of grid line groups arranged side by side along a first preset direction, each of the grid line groups comprises a plurality of grid lines with a preset length arranged in parallel along a second preset direction, and the grid lines of two adjacent grid line groups are disconnected; wherein, the first preset direction is perpendicular to the second preset direction; and
[0006] A plurality of welding tapes, each of the welding tapes connects the plurality of cell wafers in series with each other, and each of the welding tapes is welded to all the grid lines of one of the grid line groups of one of the cell wafers.
[0007] Optionally, the number of the grid line groups on each of the cell wafers is the same as the number of the welding tapes.
[0008] Optionally, the number of the welding tapes at each of the cell wafers is greater than 28 and less than or equal to 78.
[0009] Optionally, the welding tape is welded at the middle position of the grid lines of the corresponding grid line group.
[0010] Optionally, the welding tape is a special-shaped welding tape, and the special-shaped welding tape comprises a special-shaped section and a flat section, and the special-shaped section is welded to the grid line group.
[0011] Optionally, the cross-sectional shape of the shaped solder ribbon in the shaped section is triangular, and the base of the triangle is welded to the grid line.
[0012] Optionally, the triangle is an equilateral triangle; the side length of the equilateral triangle is 0.15 mm.
[0013] Optionally, the solder ribbon includes an internal core layer and an external coating layer.
[0014] Optionally, the cross-section of the internal core layer is triangular with both sides indented inward.
[0015] Optionally, all three corners of the triangle in the cross-section of the internal core layer are rounded.
[0016] In this solution, multiple groups of grid line groups are arranged at the cell. The grid lines between the grid line groups are disconnected from each other, which can save the amount of grid line paste and reduce costs. In addition, the disconnection of the grid lines between the grid line groups results in less shading of the cell compared to continuous grid lines, increasing the light absorption area of the cell, and thus improving the performance of the cell.
[0017] In this solution, the number of solder ribbons is designed to be greater than 28 and less than or equal to 78. This number is more than that of the solder ribbons in existing cells. For cells of the same area, due to the increase in the number of solder ribbons, the distance between the solder ribbons becomes shorter, which can reduce the movement path of carriers on the grid lines and reduce the consumption of carriers.
[0018] From the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more clearly aware of the above and other objects, advantages, and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:
[0020] Figure 1 is a schematic structural diagram of a cell and solder ribbons in the prior art;
[0021] Figure 2 is a schematic diagram of the flow of carriers in a cell, solder ribbons, and grid lines in the prior art;
[0022] Figure 3 is a side view of a solar cell according to a specific embodiment of the present invention;
[0023] Figure 4 is a schematic structural diagram of a cell and solder ribbons according to a specific embodiment of the present invention;
[0024] Figure 5 is a schematic diagram of the flow of carriers in a solar cell, a solder ribbon, and a grid line according to a specific embodiment of the present invention;
[0025] Figure 6 is a cross-sectional schematic diagram of a special-shaped section of a solder ribbon according to a specific embodiment of the present invention.
[0026] Explanation of reference numerals:
[0027] Solar cell - 100; solar cell piece - 10; grid line - 11; solder ribbon - 20; special-shaped section - 21; flat section - 22; internal core layer - 23; external plating layer - 24. Detailed implementation manners
[0028] In the description of this embodiment, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "height", "upper", "lower", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 invention.
[0029] As a specific embodiment of the present invention, as Figure 3 shown, this embodiment provides a solar cell. The solar cell 100 may include a plurality of solar cell pieces 10 and a plurality of solder ribbons 20. Among them, each solar cell piece 10 may include multiple groups of grid line groups arranged side by side along a first preset direction. As Figure 4 shown, each grid line group may include a plurality of grid lines 11 of a preset length arranged in parallel along a second preset direction, and the grid lines 11 of two adjacent grid line groups are disconnected. Among them, the first preset direction is perpendicular to the second preset direction. Each solder ribbon 20 connects a plurality of solar cell pieces 10 in series, and each solder ribbon 20 is welded to all the grid lines 11 of one grid line group of one of the solar cell pieces 10.
[0030] Specifically, in this embodiment, multiple groups of grid line groups are arranged at the solar cell piece 10, and the grid lines between the grid line groups are disconnected from each other, which can save the amount of grid line 11 paste and cost. In addition, the disconnection of the grid lines 11 between the grid line groups reduces the occlusion of the solar cell piece 10 compared with continuous grid lines, increases the light absorption area of the solar cell piece 10, and thus can improve the performance of the solar cell piece 10.
[0031] As a specific embodiment of the present invention, the number of grid line groups on each solar cell piece 10 in this embodiment is the same as the number of solder ribbons 20.
[0032] Specifically, the number of solder tapes 20 at each solar cell 10 is greater than 28 and less than or equal to 78.
[0033] In this embodiment, the number of solder tapes 20 is designed to be greater than 28 and less than or equal to 78. Compared with the number of solder tapes in existing solar cells, this increased number, for solar cells of the same area, due to the increased number of solder tapes, will result in a shorter distance between the solder tapes, thus reducing the movement path of carriers on the grid lines and reducing the consumption of carriers.
[0034] In addition, since the grid lines in this embodiment are discontinuous grid lines 11, a balance is formed between the reduction of the occlusion of the grid lines 11 on the solar cell 10 and the increase in the occlusion of the solar cell 10 due to the increased number of solder tapes 20. Thus, with the occlusion remaining unchanged, the transfer path of carriers on the grid lines 11 is reduced, thereby improving the performance of the battery.
[0035] As a specific embodiment of the present utility model, the solder tapes 20 in this embodiment are welded at the middle positions of the grid lines 11 of the corresponding grid line groups. Such a design can make the performance of different positions of the solar cell 10 basically consistent.
[0036] Specifically, taking a solar cell with a conventional size of 210*105 mm as an example, in the case of continuous grid lines, the diagram of 28 conventional solder tapes is as Figure 1 shown. The schematic diagram of designing 78 ultra - many solder tapes on a solar cell with a conventional size of 210*105 mm is as Figure 3 shown. The distance between two adjacent solder tapes on a solar cell with 28 conventional solder tapes is 7.4 mm (using circular solder tapes with a diameter of 0.25 mm), and the distance between two adjacent solder tapes on a solar cell with 78 ultra - many solder tapes is 2.6 mm (using equilateral triangular - shaped solder tapes with a bottom side of 0.15 mm), which greatly shortens the path of electron transmission, reduces electron loss, and improves the power of the module.
[0037] In addition, taking a solar cell with a conventional size of 210*105 mm as an example, in the case of discontinuous grid lines, the carrier flow path on a solar cell with 28 conventional solder tapes is as Figure 2 shown, with the center of the circle being the point on the solar cell farthest from the fine grid, and the arrow being the movement path of carriers on the solar cell (solar cell - fine grid - solder tape).
[0038] The solar cell with 78 ultra - many solder tapes is as Figure 5As shown in the figure, it is calculated based on the conventional 28 - strip pitch and the balanced carrier transmission path. The center of the circle is the point on the cell farthest from the grid lines, and the arrow represents the movement path of carriers on the cell (cell - fine grid - strip). By designing the number of strips and the grid line arrangement, the discontinuous grid lines can greatly reduce the transmission path of carriers on the grid lines while ensuring that the movement path of carriers on the cell is equal to that of the conventional strips, thus reducing the consumption of carriers.
[0039] As a specific embodiment of the present utility model, as Figure 3 shown in the figure, the strip 20 of this embodiment is a special - shaped strip, and the special - shaped strip includes a special - shaped section 21 and a flat section 22. The special - shaped section 21 is welded to the grid line group.
[0040] As a specific embodiment of the present utility model, as Figure 6 shown in the figure, the cross - sectional shape of the special - shaped section 21 of the special - shaped strip in this embodiment is a triangle, and the base of the triangle is welded to the grid line.
[0041] Specifically, in this embodiment, by making the cross - section of the special - shaped section 21 of the special - shaped strip be a triangle, all the light directly hitting the strip can be reflected twice onto the cell, improving the light utilization rate and thus increasing the power of the module.
[0042] Specifically, the triangle in this embodiment is an equilateral triangle. The side length of the equilateral triangle is 0.15 mm.
[0043] As a specific embodiment of the present utility model, as Figure 6 shown in the figure, the strip 20 of this embodiment may include an internal core layer 23 and an external coating layer 24. The cross - section of the internal core layer 23 is formed as a triangle with both sides indented inward. In this way, when the external coating layer 24 is plated onto the internal core layer, the outer side is a smooth surface. The internal core layer 23 of this embodiment may be a copper core layer. The material of the external coating layer 24 may be tin or a tin alloy.
[0044] As a specific embodiment of the present utility model, the three corners of the triangle of the cross - section of the internal core layer 23 in this embodiment are all rounded corners. By forming the three corners of the triangle into rounded corners, it can avoid the angles being too sharp, thereby causing stress concentration and damaging the cell or the operator.
[0045] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present utility model have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present utility model can still be directly determined or derived from the disclosed content of the present utility model without departing from the spirit and scope of the present utility model. Therefore, the scope of the present utility model should be understood and determined to cover all these other variations or modifications.
Claims
1. A solar cell, characterized in that, Comprising: A plurality of solar cells, each of the solar cells comprising a plurality of sets of grid line groups arranged side by side along a first preset direction, each of the grid line groups comprising a plurality of grid lines of a preset length arranged in parallel along a second preset direction, and the grid lines of two adjacent grid line groups being disconnected; wherein, the first preset direction is perpendicular to the second preset direction; And A plurality of solder tapes, each of the solder tapes connecting the plurality of solar cells in series with each other, and each of the solder tapes being welded to all the grid lines of one of the grid line groups of one of the solar cells.
2. The solar cell according to claim 1, wherein The number of the grid line groups on each of the solar cells is the same as the number of the solder tapes.
3. The solar cell according to claim 2, wherein The number of the solder tapes at each of the solar cells is greater than 28 and less than or equal to 78.
4. The solar cell according to claim 1, wherein The solder tape is welded at the middle position of the grid lines of the corresponding grid line group.
5. The solar cell according to claim 1, wherein The solder tape is a special-shaped solder tape, the special-shaped solder tape comprising a special-shaped section and a flat section, and the special-shaped section is welded to the grid line group; The cross-sectional shape of the special-shaped section of the special-shaped solder tape is a triangle, and the base of the triangle is welded to the grid line.
6. The solar cell according to claim 5, wherein The triangle is an equilateral triangle; the side length of the equilateral triangle is 0.15 mm.
7. The solar cell according to claim 1, wherein The solder tape comprises an internal core layer and an external coating layer.
8. The solar cell according to claim 7, wherein The cross-section of the internal core layer is formed as a triangle with both sides indented inward.
9. The solar cell according to claim 8, wherein All three corners of the triangle of the cross-section of the internal core layer are rounded.