Screen printing plate structure for printing grid lines of battery piece
By designing gate troughs and grooves of different widths in the screen structure, the problem of poor welding of cell grid lines is solved, and the effect of reducing production costs and improving connection reliability is achieved.
Patent Information
- Application Number
- CN202422407838.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In the prior art, the thickness of the gate wire formed on the cell chip is consistent, resulting in poor welding of the welding tape and the gate wire, increasing production costs and reducing the reliability of photovoltaic modules.
The screen structure design is adopted, including gate troughs and grooves of different widths. By controlling the width and length of the gate line, the use of conductive materials is reduced, while ensuring the connection strength and reliability between the gate line and the conductive connector.
It reduces the production cost of the battery cell, improves the connection strength and reliability between the gate wire and the conductive connector, reduces the phenomenon of welding defects, and improves the durability and service life of the battery cell.
Smart Images
Figure CN223058558U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of photovoltaic modules, and in particular to a screen plate structure for printing grid lines on battery wafers. Background Art
[0002] In the prior art, a plurality of grid lines are formed on a battery wafer, a plurality of pad points are provided on the grid lines, the thickness of the grid lines is uniform, a welding tape is welded to the grid lines, the production cost of the battery wafer is relatively high, and poor welding phenomena such as virtual welding are likely to occur between the welding tape and the grid lines, resulting in poor reliability of the photovoltaic module. Summary of the Utility Model
[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, an object of the utility model is to provide a screen plate structure for printing grid lines on battery wafers, which can reduce the production cost of battery wafers on the premise of ensuring the structural reliability of the battery wafers.
[0004] The screen plate structure for printing grid lines on battery wafers according to an embodiment of the utility model includes: a screen plate body, a plurality of grid line grooves are formed on the screen plate body, the plurality of grid line grooves extend along a first direction, the plurality of grid line grooves are arranged along a second direction, the grid line grooves include a first grid line groove and a second grid line groove, the second grid line groove is arranged at at least one end of the first grid line groove along the first direction, the width of the second grid line groove along the second direction is greater than the width of the first grid line groove along the second direction, and the first direction and the second direction are perpendicular.
[0005] According to the screen plate structure for printing grid lines on battery wafers of the embodiment of the utility model, through the design of the first grid line groove and the second grid line groove with different widths, the width of the grid line can be more precisely controlled during the printing process. The narrower first grid line groove can reduce the usage amount of conductive materials such as silver paste when printing the grid line, thereby reducing the production cost. The wider second grid line groove can ensure that the printed grid line has a sufficient width to ensure the connection strength and reliability between the grid line and the conductive connection member.
[0006] In some embodiments, the width of the first grid line groove is L1, and L1 satisfies: 0 < L1 ≤ 30 μm; and / or, the width of the second grid line groove is L2, and L2 satisfies: 0 < L2 ≤ 60 μm.
[0007] In some embodiments, the length of the second grid line groove along the first direction is L3, and L3 satisfies: 0 < L3 ≤ 30 mm.
[0008] In some embodiments, a plurality of grooves are formed on the screen plate body, the plurality of grooves are arranged at intervals along the first direction, the plurality of grooves are respectively opposite to the plurality of grid line grooves, and the grooves are adapted to fill welding members.
[0009] In some embodiments, the plurality of grooves include: a plurality of first grooves and a plurality of second grooves. Along the first direction, at least one of the plurality of first grooves is disposed at one end of the second gate groove away from the first gate groove; the plurality of second grooves are disposed between the plurality of first grooves. Along the first direction, at least one of the plurality of second grooves is disposed on a side of the first groove adjacent to the first gate groove and adjacent to the edge of the mesh body, and the width of the second groove along the second direction is greater than the width of the second gate groove along the second direction.
[0010] In some embodiments, the width of the first groove along the second direction is greater than the width of the second gate groove along the second direction.
[0011] In some embodiments, the width of the first groove along the second direction is greater than the width of the second groove along the second direction.
[0012] In some embodiments, at least a part of the second gate groove extends along the second direction to form the second groove.
[0013] In some embodiments, at least a part of the first gate groove extends along the second direction to form the first groove; and / or, at least a part of the second gate groove extends along the second direction to form the first groove.
[0014] In some embodiments, the plurality of gate grooves extend along the first direction and are spaced apart along the first direction and the second direction respectively.
[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings
[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:
[0017] Figure 1 is a schematic diagram of an embodiment of a mesh structure for battery cell grid line printing according to an embodiment of the present utility model;
[0018] Figure 2 is Figure 1 an enlarged schematic diagram of the P region in
[0019] Figure 3 is a schematic diagram of another embodiment of a mesh structure for battery cell grid line printing according to an embodiment of the present utility model;
[0020] Figure 4 is Figure 3 An enlarged schematic view of the Q area in
[0021] Figure 5 is a schematic view of a battery cell according to an embodiment of the present invention;
[0022] Figure 6 is Figure 5 An enlarged schematic view of the R area in
[0023] Reference numerals:
[0024] 100, screen structure;
[0025] 10, screen body; 11, grid wire grooves; 12, first grid wire groove; 13, second grid wire groove; 14, groove; 15, first groove; 16, second groove;
[0026] 20, battery cell; 21, conductive connection member; 22, grid wire; 23, welding member;
[0027] A, first direction; B, second direction. Detailed implementation manners
[0028] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Below, reference is made to Figures 1 - 6 Describe a screen structure 100 for printing grid wires 22 of a battery cell 20 according to an embodiment of the present invention, including: a screen body 10, and the screen body 10 has a first direction A and a second direction B.
[0029] Specifically, as Figures 1 - 4 shown, a plurality of grid wire grooves 11 are formed on the screen body 10. The plurality of grid wire grooves 11 extend along the first direction A, and the plurality of grid wire grooves 11 are arranged along the second direction B. The grid wire grooves 11 include a first grid wire groove 11 and a second grid wire groove 11. The second grid wire groove 11 is provided at at least one end of the first grid wire groove 11 along the first direction A. The width of the second grid wire groove 11 along the second direction B is greater than the width of the first grid wire groove 11 along the second direction B. The first direction A and the second direction B are perpendicular.
[0030] Combined with Figures 1 - 6 , the grid wire grooves 11 are parts for printing grid wires 22 on the battery cell 20. The grid wire grooves 11 are designed into specific shapes and sizes to precisely control the width and thickness of conductive materials such as silver paste printed. The plurality of grid wire grooves 11 extend along the first direction A, and the plurality of grid wire grooves 11 are arranged at intervals along the second direction B. The second grid wire grooves 11 can be two, and the two second grid wire grooves 11 are respectively provided at both ends of the first grid wire groove 11 along the first direction A.
[0031] The stencil structure 100 for printing the grid lines 22 of the battery cell 20 according to the embodiments of the present utility model can more precisely control the width of the grid lines 22 during the printing process through the design of the first grid line grooves 11 and the second grid line grooves 11 with different widths. The narrower first grid line grooves 11 can reduce the usage amount of conductive materials such as silver paste when printing the grid lines 22, thereby reducing the production cost. The wider second grid line grooves 11 can ensure that the printed grid lines 22 have sufficient width to ensure the connection strength and reliability between the grid lines 22 and the conductive connectors 21.
[0032] According to some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the width of the first grid line groove 11 is L1, and L1 satisfies: 0 < L1 ≤ 30 μm. If the width of the first grid line groove 11 is greater than 30 μm, it is not conducive to reducing the material used for the grid lines 22 and is not conducive to reducing the production cost; or, the width of the second grid line groove 11 is L2, and L2 satisfies: 0 < L2 ≤ 60 μm. The wider second grid line grooves 11 can ensure a larger welding area with the conductive connectors 21, thereby improving the welding strength and connection reliability. If the width of the second grid line groove 11 is greater than 60 μm, the second grid line groove 11 is too wide and is not conducive to reducing the material used for the grid lines 22; or, L1 satisfies: 0 < L1 ≤ 30 μm, and L2 satisfies: 0 < L2 ≤ 60 μm.
[0033] Thus, by limiting the width ranges of the first grid line grooves 11 and the second grid line grooves 11, it is possible to effectively reduce the material used for the grid lines 22 and lower the production cost of the battery cell 20 on the premise of ensuring that the grid lines 22 have sufficient width for connection with the conductive connectors 21 and ensuring the connection strength and reliability between the grid lines 22 and the conductive connectors 21.
[0034] According to some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the length of the second grid line groove 11 along the first direction A is L3, and L3 satisfies: 0 < L3 ≤ 30 mm.
[0035] If the length of the second grid line groove 11 is greater than 30 mm, it is not conducive to reducing the material used for the grid lines 22 and is not conducive to reducing the production cost. Thus, by limiting the length range of the second grid line groove 11 and precisely controlling the width and length of the grid line grooves 11, the printing accuracy and product quality of the grid lines 22 can be improved, and it can also ensure that there is sufficient contact area between the corresponding printed grid lines 22 and the conductive connectors 21, thereby ensuring the connection strength and connection reliability between the grid lines 22 and the conductive connectors 21, and thus improving the durability and service life of the battery cell 20.
[0036] According to some embodiments of the present utility model, as Figures 3 - 6As shown, the mesh body 10 is formed with a plurality of grooves 14, and the plurality of grooves 14 are arranged at intervals along the first direction A. The plurality of grooves 14 are respectively opposite to a plurality of grid wire grooves 11, and the grooves 14 are adapted to be filled with welding parts 23.
[0037] The function of the welding part 23 is to weld the grid wire 22 and the conductive connecting part 21. The conductive connecting part 21 is welded to the grid wire 22, and the conductive connecting part 21 is also welded and connected to the grid wire 22 through the welding part 23. When the grid wire 22 and the conductive connecting part 21 are welded, the current of the battery cell 20 is mainly transmitted from the grid wire 22 to the conductive connecting part 21 through the welding part 23. The filling of the welding part 23 enhances the conductive performance between the grid wire 22 and the conductive connecting part 21, ensuring the efficiency and safety of current transmission.
[0038] Thus, the provision of the grooves 14 facilitates the further printing of the welding parts 23 on the grid wire 22. The welding parts 23 can ensure a more secure weld between the grid wire 22 and the conductive connecting part 21, improving the reliability of the welding, and thus enhancing the reliability and durability of the battery cell 20 and reducing the failure rate caused by poor welding. The design of the grooves 14 helps to reduce the error during the filling process of the welding parts 23, ensuring the quality of each welding point. Integrating the filling of the welding parts 23 with the printing of the grid wire 22 simplifies the production steps of the battery cell 20.
[0039] According to some embodiments of the present invention, as Figures 3 - 6 shown, the plurality of grooves 14 include: a plurality of first grooves 15 and a plurality of second grooves 16. Along the first direction A, at least one of the plurality of first grooves 15 is provided at one end of the second grid wire groove 11 away from the first grid wire groove 11; the plurality of second grooves 16 are provided between the plurality of first grooves 15. Along the first direction A, at least one of the plurality of second grooves 16 is provided on a side of the first groove 15 adjacent to the first grid wire groove 11 and adjacent to the edge of the mesh body 10. The width of the second groove 16 along the second direction B is greater than the width of the second grid wire groove 11 along the second direction B.
[0040] Let a grid slot 11 include a first grid slot 11 and two second grid slots 11. The two second grid slots 11 are respectively arranged at both ends of the first grid slot 11 along the first direction A. That is, along the first direction A, the second grid slot 11, the first grid slot 11, and the second grid slot 11 are arranged in sequence to form the grid slot 11. A plurality of first grooves 15 are arranged at intervals on the grid slot 11 along the first direction A. At least two first grooves 15 are arranged at one end of the two second grid slots 11 along the first direction A away from the first grid slot 11. That is, the two first grooves 15 are respectively arranged at both ends of the grid slot 11 along the first direction A. The second grooves 16 can be two. The two second grooves 16 are respectively arranged on the two second grid slots 11. The second grooves 16 are arranged along the first direction A on the side of the first grooves 15 adjacent to the first grid slot 11. The second grooves 16 are arranged between two adjacent first grooves 15 located at both ends of the grid slot 11.
[0041] Thus, the groove 14 is used to fill the weldment 23 to enhance the welding strength between the grid line 22 and the conductive connecting member 21. By arranging the first groove 15 at one end of the second grid slot 11 away from the first grid slot 11, it can ensure that there is sufficient welding material at the end of the grid line 22 and enhance the strength of the welding point. By arranging the second groove 16 between the plurality of first grooves 15 and at least one second groove 16 is close to the edge of the mesh body 10, the welding strength between the grid line 22 and the conductive connecting member 21 in the edge area of the battery cell 20 can be further enhanced.
[0042] According to some embodiments of the present invention, as Figures 3 - 6 shown, the width of the first groove 15 along the second direction B is greater than the width of the second grid slot 11 along the second direction B.
[0043] The wider first groove 15 can accommodate more welding material, thus ensuring sufficient welding material between the grid line 22 and the conductive connecting member 21, enhancing the structural strength of the welding point, improving the welding quality, thereby improving the electrical conductivity and ensuring the efficiency of current transmission.
[0044] According to some embodiments of the present invention, as Figures 3 - 6 shown, the width of the first groove 15 along the second direction B is greater than the width of the second groove 16 along the second direction B.
[0045] By arranging the second groove 16 with a smaller width between the plurality of first grooves 15 and at least one second groove 16 is close to the edge of the mesh body 10, the welding strength between the grid line 22 and the conductive connecting member 21 can be further enhanced, especially the welding strength between the grid line 22 and the conductive connecting member 21 in the edge area of the battery cell 20.
[0046] The solar cell 20 is applicable to a photovoltaic module. During the lamination process of the photovoltaic module, the surface of the solar cell 20 is covered with a glue film. The glue film changes from a solid state to a liquid state and generates fluidity. When the laminator starts to evacuate, the conductive connection member 21 located in the edge area of the surface of the solar cell 20 may be subjected to an external force. This force pulls the conductive connection member 21 in a direction away from the solar cell 20. If this force is relatively large, it may cause the conductive connection member 21 to separate from the grid line 22. By providing the first groove 15 and the second groove 16, that is, forming a welding point with a relatively large area on the grid line 22, a higher welding tensile force can be provided, enhancing the connection strength between the conductive connection member 21 and the grid line 22 and preventing the conductive connection member 21 from separating from the grid line 22.
[0047] Therefore, the width of the first groove 15 along the second direction B is greater than the width of the second groove 16 along the second direction B. The welding tensile force requirement for the outer side of the solar cell 20 is relatively high because this area is easily affected by the force during the lamination process. By providing the first groove 15 with a relatively large width, the welding strength of this area can be ensured. The welding tensile force requirement for the inner area of the solar cell 20 is relatively low, and the cost can be reduced by providing the second groove 16 with a relatively small width while maintaining sufficient welding strength.
[0048] According to some embodiments of the present invention, as Figures 3 - 6 shown, at least a part of the second grid line groove 11 extends along the second direction B to form the second groove 16.
[0049] That is, the second groove 16 is formed on the second grid line groove 11 and is communicated with the second grid line groove 11. When printing the grid line 22, the provision of the second groove 16 facilitates the formation of corresponding welding points on the grid line 22.
[0050] Therefore, the welding member 23 formed corresponding to the second groove 16 and the grid line 22 are an integral body, integrating the filling of the welding member 23 with the printing of the grid line 22, simplifying the production steps of the solar cell 20 and reducing the production cost on the premise of ensuring the welding strength between the conductive connection member 21 and the grid line 22.
[0051] According to some embodiments of the present invention, as Figures 3 - 6 shown, at least a part of the first grid line groove 11 extends along the second direction B to form the first groove 15; or, at least a part of the second grid line groove 11 extends along the second direction B to form the first groove 15; or, at least a part of the first grid line groove 11 extends along the second direction B to form the first groove 15 and at least a part of the second grid line groove 11 extends along the second direction B to form the first groove 15.
[0052] Thus, through the first groove 15 formed by extending on the first grid groove 11 or the second grid groove 11, the filling accuracy of the welded part 23 can be improved, ensuring the consistency and repeatability of the welding points. Integrating the filling of the welded part 23 in the first groove 15 with the printing of the grid lines 22 simplifies the production steps of the battery cell 20, reduces the extra processes required for separately processing the welded part 23, and improves the production efficiency of the battery cell 20.
[0053] According to some embodiments of the present invention, as Figures 3 - 6 shown, multiple grid grooves 11 extend along the first direction A and are spaced apart along the first direction A and the second direction B respectively.
[0054] Multiple grid grooves 11 extend along the first direction A and are spaced apart along the second direction B to form a group of grid grooves 11 groups, which facilitates the printing of the grid lines 22 on one side surface of a battery cell 20. The screen structure 100 for printing the grid lines 22 of the battery cell 20 may include multiple groups of grid grooves 11, and the multiple groups of grid grooves 11 are spaced apart along the first direction A, so that one screen structure 100 can simultaneously print the grid lines 22 on multiple battery cells 20.
[0055] Thus, multiple grid grooves 11 extend along the first direction A and are spaced apart along the first direction A and the second direction B respectively, enabling the screen structure 100 for printing the grid lines 22 of the battery cell 20 to simultaneously print the grid lines 22 on multiple battery cells 20, improving the efficiency of printing the grid lines 22 and the production efficiency of the battery cell 20.
[0056] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and 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.
[0057] In the description of the present utility model, the "first feature" and the "second feature" may include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more. In the description of the present utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. In the description of the present utility model, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.
[0058] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
[0059] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.
Claims
1. A screen structure for grid line printing of battery cells, characterized in that, Including: A stencil body, on which a plurality of grid grooves are formed. The plurality of grid grooves extend in a first direction, and the plurality of grid grooves are arranged in a second direction. The grid grooves include a first grid groove and a second grid groove. The second grid groove is provided at at least one end of the first grid groove along the first direction. The width of the second grid groove along the second direction is greater than the width of the first grid groove along the second direction. The first direction and the second direction are perpendicular.
2. The stencil structure for battery cell grid line printing according to claim 1, wherein the width of the first grid groove is L1, and L1 satisfies: 0 < L1 ≤ 30 μm; and / or the width of the second grid groove is L2, and L2 satisfies: 0 < L2 ≤ 60 μm.
3. The screen structure for battery cell grid line printing according to claim 1, wherein The length of the second grid groove along the first direction is L3, and L3 satisfies: 0 < L3 ≤ 30 mm.
4. The screen structure for battery cell grid line printing according to claim 1, characterized in that, The stencil body is formed with a plurality of grooves. The plurality of grooves are arranged at intervals along the first direction. The plurality of grooves are respectively opposite to the plurality of grid grooves. The grooves are adapted to fill welding parts.
5. The screen structure for battery cell grid line printing according to claim 4, characterized in that, The plurality of grooves include: a plurality of first grooves. Along the first direction, at least one of the plurality of first grooves is provided at an end of the second grid groove away from the first grid groove; a plurality of second grooves. The plurality of second grooves are provided between the plurality of first grooves. Along the first direction, at least one of the plurality of second grooves is provided on a side of the first groove adjacent to the first grid groove and adjacent to the edge of the stencil body. The width of the second groove along the second direction is greater than the width of the second grid groove along the second direction.
6. The screen structure for battery cell grid line printing according to claim 5, characterized in that, The width of the first groove along the second direction is greater than the width of the second grid groove along the second direction.
7. The screen structure for cell grid line printing according to claim 5, wherein, The width of the first groove along the second direction is greater than the width of the second groove along the second direction.
8. The screen structure for battery cell grid line printing according to claim 5, characterized in that, At least a part of the second grid groove extends along the second direction to form the second groove.
9. The screen structure for battery cell grid line printing according to claim 5, characterized in that, At least a part of the first grid groove extends along the second direction to form the first groove; and / or At least a part of the second grid groove extends along the second direction to form the first groove.
10. The screen structure for battery cell grid line printing according to any one of claims 1-9, characterized in that, The plurality of grid grooves extend along the first direction and are respectively arranged at intervals along the first direction and the second direction.