Solar cell and photovoltaic module
By setting up a reinforcement section at the intersection of the main gate and the secondary gate and adopting a continuous structure, the welding defect rate problem caused by too narrow gate is solved, and the welding effect is improved and material cost is saved.
Patent Information
- Application Number
- CN202422567270.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-23
AI Technical Summary
Under the demand for cost reduction, the gate of solar cell is too narrow, resulting in an increase in welding defect rate. How to improve welding yield has become an urgent problem.
The first reinforcement part and the second reinforcement part are arranged at the intersection of the main gate and the secondary gate to increase the area of the operable area of the welding joint, and adopt a continuous structure sub-gate design to improve the connection strength and welding effect.
By increasing the operable area of the solder joint and improving the connection strength, the probability of welding fuse is reduced, the welding yield is improved, and the amount of silver paste is saved, and the processing quality of the battery cell is improved.
Smart Images
Figure CN223286149U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of photovoltaic cells, and specifically provides a solar cell and a photovoltaic module. Background Art
[0002] A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. Several solar cell monomers are connected in series or parallel at their grids through welding ribbons to form a solar cell module.
[0003] At present, with the increasing demand for cost reduction, in order to save slurry, the width of the grid on the surface of solar cells is getting shorter and shorter. However, the problem that comes with it is that the welding defect rate is getting higher and higher due to the grid being too narrow. Therefore, how to improve the welding yield of battery components while meeting the cost reduction demand has become an urgent problem to be solved in this field. Utility Model Content
[0004] The present application aims to solve the above technical problem, that is, how to solve / improve the welding yield between the welding strip and the gate on the basis of reducing costs.
[0005] In a first aspect, the present application provides a solar cell comprising:
[0006] main grid;
[0007] A secondary grid, wherein the extension direction of the secondary grid intersects with the extension direction of the main grid, and the secondary grid is a continuous structure in the extension direction;
[0008] The first reinforcement portion is located at the intersection of the main grid and the auxiliary grid. The extension direction of the first reinforcement portion is consistent with the extension direction of the main grid, and the width of the first reinforcement portion is greater than the width of the main grid.
[0009] In one technical solution of the above-mentioned battery cell, the battery cell further includes:
[0010] The second reinforcing portion is located at the intersection of the main grid and the auxiliary grid. The extension direction of the second reinforcing portion is consistent with the extension direction of the auxiliary grid, and the width of the second reinforcing portion is greater than the width of the auxiliary grid.
[0011] In one technical solution of the above-mentioned solar cell, the distances from the sides of the first reinforcement portion located on both sides of the main grid extension direction to the main grid are the same; or
[0012] The main grid and the auxiliary grid form an intersection, and in a direction away from the intersection, the distance from the sides of the first reinforcement portion located on both sides of the main grid extending direction to the main grid gradually decreases.
[0013] In one technical solution of the above-mentioned solar cell, the distances from the sides of the second reinforcement portion located on both sides of the auxiliary grid in the extension direction to the auxiliary grid are the same; or
[0014] The main grid and the auxiliary grid form an intersection, and in a direction away from the intersection, the distance from the side edges of the second reinforcement portion located on both sides of the auxiliary grid in the extension direction to the auxiliary grid gradually decreases.
[0015] In one technical solution of the above-mentioned battery cell, the main grid, the first reinforcement part and the second reinforcement part are integrally formed.
[0016] In one technical solution of the above-mentioned battery cell, the auxiliary grid is formed on the surfaces of the first reinforcement part and the second reinforcement part.
[0017] In one technical solution of the above-mentioned solar cell, the width D1 of the first reinforcement portion and the width d1 of the main grid satisfy the following relationship:
[0018] 1.5d1≤D1≤2d1.
[0019] In one technical solution of the above-mentioned solar cell, the width D2 of the second reinforcement portion and the width d2 of the auxiliary grid satisfy the following relationship:
[0020] 3d2≤D2≤4d2.
[0021] In one technical solution of the above-mentioned battery cell, the width of the first reinforcement portion is 35-70 μm.
[0022] In one technical solution of the above-mentioned battery cell, the width of the second reinforcement portion is 45-60 μm.
[0023] In a second aspect, the present application provides a photovoltaic module comprising a plurality of cells as described in any one of the first aspects, wherein the plurality of cells are connected by welding ribbons.
[0024] Under the condition of adopting the above technical solution, the present application can increase the coverage area of the silver paste in the area around the intersection of the main grid and the auxiliary grid by setting a first reinforcement part at the intersection of the main grid and the auxiliary grid, so that when the welding strip is arranged along the extension direction of the main grid, the area of the solder joint operable area can be increased, and the probability of melting at the intersection of the main grid and the auxiliary grid due to the excessive narrow width of the auxiliary grid is reduced, thereby improving the welding effect and welding yield, and improving the processing quality of the battery cell. On the other hand, the auxiliary grid of the present application adopts a continuous structure. In the structure of the printing screen, the mesh corresponding to the auxiliary grid is also an integrated through-hole, which is conducive to the production of the printing screen. Moreover, the auxiliary grid is a continuous structure. Compared with the discontinuous design of the auxiliary grid at the position of the first reinforcement part, it can avoid the phenomenon of the auxiliary grid being misaligned in its extension direction, thereby improving the connection strength at the intersection of the auxiliary grid, the first reinforcement part and the main grid, which is conducive to further improving the welding effect and welding yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The preferred embodiments of the present application are described below with reference to the accompanying drawings, in which:
[0026] Figure 1 is a schematic diagram of a partial structure of a solar cell surface according to one embodiment of the present application;
[0027] Figure 2 is a schematic diagram of a partial structure of a solar cell surface according to another embodiment of the present application;
[0028] Figure 3 It is along Figure 2 Sectional view along line AA.
[0029] In the figures, the reference numerals refer to the following:
[0030] 1. Main grid; 2. Auxiliary grid; 3. First reinforcement; 4. Second reinforcement. DETAILED DESCRIPTION
[0031] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art may adjust these embodiments as needed to suit specific applications.
[0032] It should be noted that, in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] Furthermore, it should be noted that, in the description of this application, unless otherwise specified or limited, the terms "installed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0034] The grid on the surface of a solar cell is typically printed with silver paste, which is relatively expensive. Therefore, with the increasing demand for cost reduction, some related technologies often reduce the width of the secondary grid to reduce the amount of silver paste used. However, with this approach, as the secondary grid width becomes narrower, the connection area between the main grid and the secondary grid is too small, which can easily cause the weld to fuse, thus affecting the welding effect between the main grid and the secondary grid and reducing the welding yield.
[0035] Reference Figure 1 , is a schematic diagram of a partial structure of the surface of a solar cell according to an embodiment of the present application, which includes a main grid 1, a secondary grid 2, and a first reinforcement portion 3. The extension direction of the main grid 1 intersects with the extension direction of the secondary grid 2. In an optional embodiment of the present application, the extension direction of the main grid 1 and the extension direction of the secondary grid 2 are perpendicular to each other. It should be noted that on the surface of the solar cell, multiple main grids 1 and multiple secondary grids 2 are arranged side by side, and the multiple main grids 1 and multiple secondary grids 2 intersect with each other to form a grid structure.
[0036] The first reinforcement 3 is located at the intersection of the main grid 1 and the auxiliary grid 2. The extension direction of the first reinforcement 3 is consistent with the extension direction of the main grid 1, and the width of the first reinforcement 3 is greater than the width of the main grid 1. Optionally, the width of the first reinforcement 3 is 35-70μm. It should be noted that the width of the first reinforcement 3 and the width of the main grid 1 mentioned above refer to their respective dimensions in the direction perpendicular to the extension direction of the main grid 1.
[0037] The auxiliary grid 2 is a continuous structure in its extension direction, for example, Figure 1In one embodiment shown, the secondary grid 2 is a continuous linear structure in its extension direction. In the actual processing of solar cells, the main grid 1 and the first reinforcement 3 can be printed on the surface of the cell first, and then the secondary grid 2 can be printed. Of course, in other embodiments, a continuous secondary grid 2 can be printed first, and then the main grid 1 and the first reinforcement 3 can be printed. This application does not impose any restrictions on this, as long as the continuity of the secondary grid 2 can be guaranteed.
[0038] As mentioned above, the present application sets a first reinforcement part 3 at the intersection of the main grid 1 and the auxiliary grid 2, which can increase the coverage area of the silver paste in the area around the intersection of the main grid 1 and the auxiliary grid 2. Therefore, when the welding strip is arranged along the extension direction of the main grid 1, the area of the operable area of the welding point can be increased, and the probability of melting at the intersection of the main grid 1 and the auxiliary grid 2 due to the narrow width of the auxiliary grid 2 is reduced, thereby improving the welding effect and welding yield.
[0039] On the other hand, the auxiliary grid 2 of the present application adopts a continuous structure. In the structure of the printing screen, the mesh corresponding to the auxiliary grid 2 is also an integrated through-hole, which is conducive to the production of the printing screen. Moreover, the auxiliary grid 2 is a continuous structure. Compared with the intermittent design of the auxiliary grid 2 at the position of the first reinforcement part 3, it can avoid the phenomenon of misalignment of the auxiliary grid 2 in its extension direction, thereby improving the connection strength at the intersection of the auxiliary grid 2, the first reinforcement part 3 and the main grid 1, which is conducive to further improving the welding effect and welding yield.
[0040] Reference Figure 1 In one implementation of the present application, a second reinforcement portion 4 is further provided on the surface of the cell. The second reinforcement portion 4 is located at the intersection of the main grid 1 and the auxiliary grid 2. The extension direction of the second reinforcement portion 4 is consistent with the extension direction of the auxiliary grid 2, and the width of the second reinforcement portion 4 is greater than the width of the auxiliary grid 2. Optionally, the width of the second reinforcement portion 4 is 45-60 μm. The width of the second reinforcement portion 4 and the auxiliary grid 2 mentioned above refers to their dimensions perpendicular to the extension direction of the auxiliary grid 2.
[0041] The second reinforcement part 4 intersects with the first reinforcement part 3 and covers the intersection position of the main grid 1 and the auxiliary grid 2. Therefore, by setting the second reinforcement part 4, the coverage area of the silver paste in the area around the intersection point of the main grid 1 and the auxiliary grid 2 can be further increased, thereby improving the welding effect and welding yield.
[0042] Reference Figure 1 As an optional implementation of the present application, the first reinforcement portion 3 and / or the second reinforcement portion 4 is rectangular in shape, that is, the side edges of the first reinforcement portion 3 on both sides of the extension direction of the main grid 1 are at the same distance from the main grid 1, and / or the side edges of the second reinforcement portion 4 on both sides of the extension direction of the auxiliary grid 2 are at the same distance from the auxiliary grid 2.
[0043] As another optional method of the present application, the width of the first reinforcement portion 3 and / or the second reinforcement portion 4 is set in a "gradual" manner. Specifically, in the direction away from the intersection of the main grid 1 and the auxiliary grid 2, the distance from the side edges of the first reinforcement portion 3 on both sides of the extension direction of the main grid 1 to the main grid 1 gradually decreases, and / or the distance from the side edges of the second reinforcement portion 4 on both sides of the extension direction of the auxiliary grid 2 to the auxiliary grid 2 gradually decreases.
[0044] For example, refer to Figure 2 The first reinforcement portion 3 and the second reinforcement portion 4 are both trapezoidal in shape, and the end close to the intersection of the main grid 1 and the auxiliary grid 2 is the wider end, and the end away from the intersection of the main grid 1 and the auxiliary grid 2 is the narrower end.
[0045] It is understandable that when using a welding ribbon to weld a cell, although the position of the weld may deviate due to the influence of equipment accuracy or human operation factors, in the welding area around the intersection of the main grid 1 and the auxiliary grid 2, the closer the area is to the intersection of the main grid 1 and the auxiliary grid 2, the greater the possibility of forming a weld, that is, the position of the weld is generally not too far away from the intersection of the main grid 1 and the auxiliary grid 2. Therefore, through the above-mentioned arrangement, the width of the first reinforcement part 3 and the second reinforcement part 4 is gradually reduced in the direction away from the intersection, which can effectively ensure the coverage area of the silver paste near the intersection, improve the welding effect and welding yield, and at the same time reduce the coverage area of the silver paste away from the intersection, saving the amount of lead paste. In this way, the material cost can be minimized while ensuring the welding effect and welding yield.
[0046] It should be noted that although the above-mentioned embodiments of the present application illustrate the trapezoidal shape of the first reinforcement portion 3 and the second reinforcement portion 4, this does not constitute a limitation of the present application. For example, in some other implementations, the first reinforcement portion 3 and the second reinforcement portion 4 may also be elliptical, or the first reinforcement portion 3 and the second reinforcement portion 4 may together form a circular structure, etc. In this case, the first reinforcement portion 3 and the second reinforcement portion 4 may be understood as a single component. Any variations in the specific shapes of the first reinforcement portion 3 and the second reinforcement portion 4 shall fall within the scope of protection of the present application.
[0047] Reference Figure 1 and Figure 2 , where D1 is the width of the first reinforcement 3, d1 is the width of the main grid 1, and the width D1 of the first reinforcement 3 and the width d1 of the main grid 1 satisfy the following relationship: 1.5d1≤D1≤2d1. D2 is the width of the second reinforcement 4, d2 is the width of the auxiliary grid 2, and the width D2 of the second reinforcement 4 and the width d2 of the auxiliary grid 2 satisfy the following relationship: 3d2≤D2≤4d2.
[0048] It should be noted that when the widths of the first reinforcement portion 3 and the second reinforcement portion 4 are configured in a "gradual" manner, D1 can be understood as the width at any position of the first reinforcement portion 3, and D2 can be understood as the width at any position of the second reinforcement portion 4. In this way, the present application controls the relative dimensions between the first reinforcement portion 3 and the main grid 1, and between the second reinforcement portion 4 and the auxiliary grid 2, within the aforementioned ranges, which helps ensure silver paste coverage around the intersection of the main grid 1 and the auxiliary grid 2, while reducing material costs.
[0049] Reference Figure 3 , for along Figure 2 The cross-sectional view along line AA in the figure (the dotted line in the figure shows the boundary line of the main grid 1 in its width direction). Figure 2 and Figure 3 In one embodiment of the present application, the busbar 1, first reinforcement 3, and second reinforcement 4 are integrally formed. Accordingly, a mesh corresponding to the pattern formed by the busbar 1, first reinforcement 3, and second reinforcement 4 is formed on the printing screen. This allows the busbar 1, first reinforcement 3, and second reinforcement 4 to be formed simultaneously during the printing process. This not only facilitates the production of the printing screen but also improves printing efficiency, thereby enhancing the processing efficiency of the solar cell.
[0050] Furthermore, the auxiliary grid 2 is formed on the surface of the first reinforcement part 3 and the second reinforcement part 4, that is, in the thickness direction of the battery cell, the auxiliary grid 2 corresponding to the portion of the area around the intersection of the main grid 1 and the auxiliary grid 2 is stacked on the first reinforcement part 3 and the second reinforcement part 4. In this way, after the main grid 1, the first reinforcement part 3 and the second reinforcement part 4 are printed, the auxiliary grid 2 is formed by another printing screen printing, so that the auxiliary grid 2 forms a continuous straight line structure.
[0051] In some other implementations, the auxiliary grid 2 may be printed first, and then the auxiliary grid 2, the first reinforcement 3, and the second reinforcement 4 may be printed. In this case, the first reinforcement 3 and the second reinforcement 4 are stacked on the auxiliary grid 2. This application does not impose any specific restrictions on the relative positions of the auxiliary grid 2 and the first reinforcement 3 and the second reinforcement 4 in the thickness direction of the solar cell, as long as the auxiliary grid 2 can be continuous in its extension direction.
[0052] The present application also discloses a photovoltaic module, which includes a plurality of solar cells as in any of the above embodiments, wherein the plurality of solar cells are welded together by welding ribbons to form a battery string, and the plurality of battery strings can be electrically connected in series and / or in parallel. Of course, the outer side of the formed battery string can also be coated with a packaging film, or a protective member such as a cover plate can be provided. This is a well-known technology in the art and will not be described in detail in this application. It should be understood that the above-mentioned photovoltaic module of the present application can be a single-glass module or a double-glass module, and this application does not limit this.
[0053] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.
Claims
1. A solar cell, characterized in that: include: main grid; A secondary grid, wherein the extension direction of the secondary grid intersects with the extension direction of the main grid, and the secondary grid is a continuous structure in the extension direction; The first reinforcement portion is located at the intersection of the main grid and the auxiliary grid. The extension direction of the first reinforcement portion is consistent with the extension direction of the main grid, and the width of the first reinforcement portion is greater than the width of the main grid.
2. The battery cell according to claim 1, wherein: The battery cell further comprises: The second reinforcing portion is located at the intersection of the main grid and the auxiliary grid. The extension direction of the second reinforcing portion is consistent with the extension direction of the auxiliary grid, and the width of the second reinforcing portion is greater than the width of the auxiliary grid.
3. The battery cell according to claim 2, characterized in that: The distances between the sides of the first reinforcement portion located on both sides of the main grid extension direction and the main grid are the same; or The main grid and the auxiliary grid form an intersection, and in a direction away from the intersection, the distance from the sides of the first reinforcement portion located on both sides of the main grid extending direction to the main grid gradually decreases.
4. The battery cell according to claim 2, characterized in that: The distances between the sides of the second reinforcement portion located on both sides of the auxiliary grid in the extension direction and the auxiliary grid are the same; or The main grid and the auxiliary grid form an intersection, and in a direction away from the intersection, the distance from the side edges of the second reinforcement portion located on both sides of the auxiliary grid in the extension direction to the auxiliary grid gradually decreases.
5. The battery cell according to claim 2, characterized in that: The main grid, the first reinforcement portion, and the second reinforcement portion are integrally formed.
6. The battery cell according to claim 5, characterized in that: The auxiliary grid is formed on surfaces of the first reinforcement portion and the second reinforcement portion.
7. The battery cell according to any one of claims 1 to 6, characterized in that: The width D1 of the first reinforcement portion and the width d1 of the main grid satisfy the following relationship: 1.5d1≤D1≤2d1.
8. The battery cell according to any one of claims 2 to 6, characterized in that: The width D2 of the second reinforcement portion and the width d2 of the auxiliary grid satisfy the following relationship: 3d2≤D2≤4d2.
9. The battery cell according to any one of claims 1 to 6, characterized in that: The width of the first reinforcement portion is 35-70 μm.
10. The battery cell according to any one of claims 2 to 6, characterized in that: The width of the second reinforcement portion is 45-60 μm.
11. A photovoltaic module, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 10, wherein the plurality of battery cells are connected by welding ribbons.