Solar cell
By alternately setting the positive and negative gate lines on the back of the solar cell and directly welding, the problem of excessive silver paste consumption during the welding process is solved, and the effect of reducing costs and improving performance is achieved.
Patent Information
- Application Number
- CN202420564149.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-22
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-22
AI Technical Summary
Existing BC batteries consume a lot of silver paste during welding, resulting in increased costs.
Abolish the main gate, alternately set the positive and negative gate lines on the back of the solar cell, and directly set multiple welding points on these gate lines, and use welding tape to directly weld these welding points to reduce the use of silver paste.
It greatly reduces the use of silver paste, reduces production costs, and improves the performance of the battery.
Smart Images
Figure CN222602933U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of solar cells, and in particular to a solar cell and a cell string. Background Art
[0002] BC cells, short for "full back contact (full reverse electrode contact) crystalline silicon photovoltaic cells," are a type of solar cell technology. BC cells utilize a design that differs from traditional crystalline silicon photovoltaic cells. Their electrodes are located on the reverse side (back side) of the cell, leaving the front side fully exposed to sunlight and improving light absorption efficiency. This design also reduces the number of paths for current transmission, lowering resistance and improving cell performance.
[0003] In the existing technology, ordinary BC batteries have multiple busbars. The busbar is made by printing a paste whose main component is silver on the battery, sintering it, and attaching it to the silicon wafer. Multiple busbars mean the consumption of a large amount of silver paste, which increases the cost. Utility Model Content
[0004] In order to improve the problem of high cost caused by large amount of silver paste consumed during welding, the present application provides a solar cell and a cell string.
[0005] The solar cell and battery string provided in this application adopt the following technical solutions:
[0006] A solar cell has no grid lines on the front side, and is provided with a plurality of positive fine grid lines and negative fine grid lines on the back side. The solar cell is symmetrically provided with two groups of cell sheets, and the positive fine grid lines and negative fine grid lines are alternately arranged on each group of cell sheets. Each of the positive fine grid lines and negative fine grid lines is provided with a plurality of welding points at set positions along the length direction.
[0007] A solar cell string comprises a plurality of cells and a plurality of welding ribbons, wherein each cell is cut from a solar cell, the plurality of cells are connected end to end, the plurality of welding ribbons are connected in series, and the plurality of welding ribbons are respectively welded to welding points on a positive electrode fine grid line or to welding points on a negative electrode fine grid line.
[0008] In one embodiment, insulating glue is provided on the positive electrode fine grid line or the negative electrode fine grid line between two adjacent welding points at a position corresponding to the welding strip.
[0009] The solar cell and battery string provided by the embodiments of the present disclosure can achieve the following technical effects:
[0010] In the present application, the main grid is eliminated, and only positive and negative fine grid lines are alternately arranged on the back of the battery cell, and multiple welding points are directly set on the positive and negative fine grid lines, and silver paste is applied to the welding points; in the process of producing battery strings, welding strips are used to directly weld to the positive or negative fine grid lines, and directly collect and transport the carriers on the positive or negative fine grid lines, and the main grid is removed. In this way, the use of silver paste can be greatly reduced and the cost can be reduced.
[0011] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 This is a schematic structural diagram of a solar cell provided in an embodiment of the present application.
[0013] Figure 2 This is a schematic diagram of the arrangement of the battery cells after cutting provided in the embodiment of the present application.
[0014] Figure 3 This is a schematic structural diagram of a solar cell string provided in an embodiment of the present application.
[0015] Explanation of the accompanying symbols: 1. Positive electrode fine grid line; 2. Negative electrode fine grid line; 3. Battery cell; 4. Welding point; 5. Welding strip; 6. Insulating glue; 7. Positive electrode of battery string; 8. Negative electrode of battery string. DETAILED DESCRIPTION
[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0017] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.
[0018] The following is combined with Figure 1-3 This application is described in further detail.
[0019] A solar cell has no grid lines on the front side of the solar cell, and is provided with a plurality of positive fine grid lines 1 and negative fine grid lines 2 on the back side of the solar cell. The solar cell is symmetrically provided with two groups of battery cells 3, and the positive fine grid lines 1 and the negative fine grid lines 2 are alternately arranged on each group of battery cells 3. Each positive fine grid line 1 and each negative fine grid line 2 is provided with a plurality of welding points 4 at set positions along the length direction.
[0020] In this application, the main grid is eliminated, and only positive fine grid lines 1 and negative fine grid lines 2 are alternately arranged on the back of the battery cell 3, and multiple welding points 4 are directly set on the positive fine grid lines 1 and the negative fine grid lines 2, and solder paste is applied to the welding points 4. In this way, the use of silver paste can be greatly reduced and the cost can be reduced.
[0021] A solar cell string includes multiple cells 3 and multiple welding ribbons 5. Each cell 3 is cut from a solar cell. The multiple cells 3 are connected end to end. The multiple welding ribbons 5 are connected in series with the multiple cells 3. The multiple welding ribbons 5 are respectively welded to the welding points 4 on the positive electrode fine grid line 1 or the welding points 4 on the negative electrode fine grid line 2.
[0022] During the assembly process of a solar cell string, the solar cell is cut from the middle into two groups of cells 3, and one group of cells 3 is flipped 180 degrees so that the cells 3 are connected end to end. Then, a welding ribbon 5 is used to weld the positive electrode fine grid lines 1 or the negative electrode fine grid lines 2, so that the cells 3 are connected in series, forming a cell string positive electrode 7 and a cell string negative electrode 8. In this way, the welding ribbon 5 is used to directly contact the positive electrode fine grid lines 1 or the negative electrode fine grid lines 2, and directly collect and transport the carriers on the positive electrode fine grid lines 1 or the negative electrode fine grid lines 2, eliminating the main grid, reducing the use of silver paste, and lowering costs.
[0023] In one embodiment, insulating glue 6 is provided on the positive electrode thin grid line 1 or the negative electrode thin grid line 2 between two adjacent welding points 4 at a position corresponding to the welding strip 5, thereby preventing the positive and negative electrodes on the same sheet from short-circuiting through the welding strip 5.
[0024] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A solar cell, wherein the front side of the solar cell has no grid lines, and the back side of the solar cell is provided with a plurality of positive fine grid lines and negative fine grid lines, characterized in that: The solar cell is symmetrically provided with two groups of cells, on each group of cells, positive fine grid lines and negative fine grid lines are alternately arranged, and each of the positive fine grid lines and negative fine grid lines is provided with a plurality of welding points at set positions along the length direction; It comprises a plurality of battery cells and a plurality of welding strips, each of which is cut from a solar cell, the plurality of battery cells are connected end to end, the plurality of welding strips are connected in series with the plurality of battery cells, and the plurality of welding strips are respectively welded to welding points on the positive electrode fine grid line or to welding points on the negative electrode fine grid line; The solar cell is cut into two groups of cells from the middle, and one group of cells is flipped 180 degrees so that the cells are connected end to end, and then the welding ribbon is used to weld with the positive electrode fine grid wire or the negative electrode fine grid wire to connect the cells in series and form a positive electrode of the cell string and a negative electrode of the cell string; the welding ribbon is used to directly contact the positive electrode fine grid wire or the negative electrode fine grid wire, and directly collect and transport the carriers on the positive electrode fine grid wire or the negative electrode fine grid wire.
2. The solar cell according to claim 1, characterized in that: On the positive electrode fine grid line or the negative electrode fine grid line between two adjacent welding points, an insulating glue is provided at a position corresponding to the welding strip.