No-grid-line solar cell conductive wire structure and cell string
By setting reinforced connection points and interlaced conductive wire mesh in the conductive wire structure of gridless solar cells, the problems of wire twisting and deformation and insufficient bonding force are solved, thereby improving the connection strength and welding quality of the battery string.
Patent Information
- Application Number
- CN202422901991.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing solar cell welding wires are prone to twisting and deformation during stretching and welding, and their bonding force with the solar cells is insufficient, resulting in a decline in welding quality.
The structure employs a gridless solar cell conductive wire structure. By setting reinforced connection points on the conductive wire mesh and using interlaced conductive wire mesh and solar cells, the welding area and connection strength are increased. The use of pre-formed conductive wire structure avoids twisting, deformation and displacement during the welding process.
This improved the connection strength and welding quality between the conductive wire and the battery cell, solved the problems of wire twisting and deformation and insufficient bonding force, and achieved a more stable battery string connection.
Smart Images
Figure CN223652630U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solar cell fabrication technology, and in particular to a gridless solar cell conductive wire structure and cell string. Background Technology
[0002] When solar cells are welded into a battery string, several welding wires are first stretched by a traction mechanism, then cut to a certain length and laid on the battery cell. Then, a perforated press is laid on the welding wire to fix it. Finally, the welding wire is welded to the main grid of the battery cell to form a battery string by infrared welding.
[0003] As the number of main grids in solar cells increases, so does the number of welding wires. To reduce light shading by the welding wires, their diameters are becoming increasingly thinner. However, this thinning leads to problems such as breakage and twisting during traction and stretching. Furthermore, with the development of solar technology, main grids are gradually being eliminated, requiring even more and thinner welding wires to collect current. This exacerbates issues such as wire twisting and deformation, displacement, and insufficient adhesion between the welding wire and the cell surface. Utility Model Content
[0004] The purpose of this invention is to provide a gridless solar cell conductive wire structure and cell string to address the above-mentioned shortcomings, thereby solving the problems of wire twisting and deformation, displacement, and insufficient bonding force between the wire and the cell surface in the prior art.
[0005] This utility model is achieved through the following solution:
[0006] A gridless solar cell conductive wire structure includes, but is not limited to, a first conductive wire mesh, a second conductive wire mesh, and a connecting mesh; the first and second conductive wire meshes are both set at a predetermined angle, such that the first and second conductive wire meshes are in different planes, and the first and second conductive wire meshes are also provided with reinforcing connection points.
[0007] Based on the above-mentioned gridless solar cell conductive wire structure, the first conductive wire mesh includes a first warp conductive wire and a first weft conductive wire; the first warp conductive wire is arranged in parallel with multiple wires, and the first weft conductive wire is arranged perpendicular to the first warp conductive wire; the first warp conductive wire and the first weft conductive wire are interwoven to form a planar mesh structure.
[0008] Based on the above-mentioned gridless solar cell conductive wire structure, the second conductive wire mesh includes a second warp conductive wire and a second weft conductive wire; multiple second warp conductive wires are arranged in parallel, and the second weft conductive wires are arranged perpendicular to the second warp conductive wires; the second warp conductive wires and the second weft conductive wires are interwoven to form a planar mesh structure.
[0009] Based on the above-mentioned gridless solar cell conductive wire structure, the number of the first warp conductive wires is not less than the number of the first weft conductive wires; the number of the second warp conductive wires is not less than the number of the second weft conductive wires.
[0010] Based on the above-mentioned gridless solar cell conductive wire structure, the second conductive wire mesh and the connecting mesh contact portion, as well as the connecting mesh, do not have second weft conductive wires; the first conductive wire mesh and the connecting mesh contact portion, as well as the connecting mesh, do not have first weft conductive wires.
[0011] Based on the above-mentioned gridless solar cell conductive wire structure, the reinforcing connection point is set at the intersection of the first warp conductive wire and the first weft conductive wire, and at the intersection of the second warp conductive wire and the second weft conductive wire. The size of the reinforcing connection point is not less than the size of the first warp conductive wire, the first weft conductive wire, the second warp conductive wire, or the second weft conductive wire.
[0012] Based on the above-mentioned gridless solar cell conductive wire structure, both the first warp conductive wire and the first weft conductive wire are made of first conductive copper wire. The first conductive copper wire includes a copper core layer, a first plating layer, and a second plating layer. The first plating layer and the second plating layer are symmetrically arranged on the outer wall of the copper core layer along the center position. The first plating layer is in contact with the solar cell, and the second plating layer is disposed away from the solar cell. The first plating layer is a plating layer containing silver and graphene materials, and the second plating layer is a low-cost tin coating.
[0013] Based on the above-mentioned gridless solar cell conductive wire structure, the second warp conductive wire and the second weft conductive wire are both made of second conductive copper wire. The second conductive copper wire includes a copper core layer, a third plating layer and a fourth plating layer; the third plating layer and the fourth plating layer are respectively symmetrically arranged on the outer wall of the copper core layer along the center position of the copper core layer.
[0014] Based on the above-mentioned gridless solar cell conductive wire structure, the second warp conductive wire and the second weft conductive wire are both made of second conductive copper wire. The second conductive copper wire includes a copper core layer, a third plating layer and a fourth plating layer. The third plating layer and the fourth plating layer are symmetrically arranged on the outer wall of the copper core layer along the center position. The fourth plating layer is in contact with the solar cell, and the third plating layer is disposed away from the solar cell.
[0015] Based on the above-mentioned gridless solar cell conductive wire structure, the first warp conductive wire and the first weft conductive wire; as well as the second warp conductive wire and the second weft conductive wire are all integrally formed structures.
[0016] This solution also discloses a battery string, comprising several battery cells and several conductive wire structures; the conductive wire structures are arranged between adjacent battery cells to connect the battery cells in series.
[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:
[0018] 1. This solution pre-forms the conductive wires, avoiding the problems of wire twisting, deformation, displacement, and insufficient bonding force between the wires and the battery cell surface caused by the existing technology of welding one by one. By setting reinforced connection points on the conductive wire mesh, the welding area can be increased, thereby increasing the connection strength between the conductive wire mesh and the battery cell. When using this solution, adjacent electrode sheets can be staggered between the first and second conductive wire meshes. Attached Figure Description
[0019] Figure 1 This is a cross-sectional structural diagram of the entire utility model;
[0020] Figure 2 This is a top view of the overall structure of this utility model;
[0021] Figure 3 This is a schematic diagram of the battery string structure in this utility model;
[0022] Figure descriptions: 1. First conductive wire mesh; 2. Second conductive wire mesh; 3. Connecting mesh; 4. Reinforcing connection point; 5. Battery cell; 11. First warp conductive wire; 12. First weft conductive wire; 13. Copper core layer; 14. First plating layer; 15. Second plating layer; 21. Second warp conductive wire; 22. Second weft conductive wire; 23. Third plating layer; 24. Fourth plating layer. Detailed Implementation
[0023] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.
[0024] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.
[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0026] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.
[0027] Example 1
[0028] like Figures 1-2 As shown, this utility model provides a technical solution:
[0029] A gridless solar cell conductive wire structure includes, but is not limited to, a first conductive wire mesh 1, a second conductive wire mesh 2, and a connecting mesh 3; the first conductive wire mesh 1 and the second conductive wire mesh 2 are both set at a predetermined angle, so that the first conductive wire mesh 1 and the second conductive wire mesh 2 are in different planes, and reinforcing connection points 4 are also provided on the first conductive wire mesh 1 and the second conductive wire mesh 2.
[0030] Based on the above structure, this solution pre-forms the conductive wires, avoiding the problems of wire twisting, deformation, displacement, and insufficient bonding force between the wires and the surface of the battery cell 5 caused by the existing technology of welding one by one. By setting reinforced connection points 4 on the conductive wire mesh, the welding area can be increased, thereby increasing the connection strength between the conductive wire mesh and the battery cell 5. When using this solution, adjacent electrode plates can be staggered between the first conductive wire mesh 1 and the second conductive wire mesh 2.
[0031] It is important to note that the welding in the cell 5 area is not done using welding rods in the traditional sense. Instead, after the conductive wire mesh is laid on the cell 5, it is fixed by applying pressure blocks, and then welding is carried out by heating the infrared lamp tube to a temperature of 120-200℃. This melts the coating on the surface of the conductive wire onto the cell 5, ultimately achieving welding and forming a battery string.
[0032] As an example, the first conductive mesh 1 may include a first warp conductive wire 11 and a first weft conductive wire 12; the first warp conductive wire 11 is arranged in parallel with multiple wires, and the first weft conductive wire 12 is arranged perpendicular to the first warp conductive wire 11; the first warp conductive wire 11 and the first weft conductive wire 12 are interwoven to form a planar mesh structure.
[0033] Based on the above structure, the first warp conductive wires 11 and the first weft conductive wires 12 are interwoven to form a conductive structure and a support structure that contacts the battery cell 5. The densely distributed first warp conductive wires 11 provide a reliable support structure and conductive structure for the battery cell 5, while the first weft conductive wires 12 are used to form the first warp conductive wires 11 into a whole, and can also provide a certain degree of support and conductivity.
[0034] As an example, the number of first warp conductive wires 11 is not less than the number of first weft conductive wires 12;
[0035] As an example, no first weft conductive wire 12 is provided at the contact portion between the first conductive wire mesh 1 and the connecting mesh 3, nor on the connecting mesh 3.
[0036] Based on the above structure, since the contact area between the first conductive mesh 1 and the connecting mesh 3 is close to the edge of the battery cell 5, setting the first weft conductive wire 12 may damage the battery cell 5 during pressing. Therefore, the first weft conductive wire 12 is not set at this location. The connecting mesh 3 does not contact the battery cell 5, so for cost considerations, the first weft conductive wire 12 is not set at this location.
[0037] As an example, the second conductive mesh 2 may include a second warp conductive wire 21 and a second weft conductive wire 22; the second warp conductive wire 21 is arranged in parallel with multiple wires, and the second weft conductive wire 22 is arranged perpendicular to the second warp conductive wire 21; the second warp conductive wire 21 and the second weft conductive wire 22 are interwoven to form a planar mesh structure.
[0038] Based on the above structure, the crisscrossing second warp conductive wires 21 and second weft conductive wires 22 form a conductive and support structure that contacts the battery cell 5. The densely distributed second warp conductive wires 21 provide a reliable support and conductive structure for the battery cell 5, while the second weft conductive wires 22 are used to form the second warp conductive wires 21 into a whole, and can also provide certain support and conductivity.
[0039] As an example, the number of second warp conductive wires 21 is not less than the number of second weft conductive wires 22;
[0040] As an example, no second weft conductive wire 22 is provided at the contact part between the second conductive wire mesh 2 and the connecting mesh 3, nor on the connecting mesh 3.
[0041] Based on the above structure, since the contact area between the second conductive mesh 2 and the connecting mesh 3 is close to the edge of the battery cell 5, setting the second weft conductive wire 22 may damage the battery cell 5 during pressing. Therefore, the second weft conductive wire 22 is not set at this location. The connecting mesh 3 does not contact the battery cell 5, so for cost considerations, the second weft conductive wire 22 is not set there.
[0042] As an example, the reinforcing connection point 4 can be set at the intersection of the first warp conductive wire 11 and the first weft conductive wire 12, and at the intersection of the second warp conductive wire 21 and the second weft conductive wire 22, and the size of the reinforcing connection point 4 is not less than the size of the first warp conductive wire 11, the first weft conductive wire 12, the second warp conductive wire 21, or the second weft conductive wire 22.
[0043] Based on the above structure, by setting multiple reinforced connection points 4, the area at that point can be increased, thereby increasing the area of the coating on it. This will result in a better welding effect and increased connection strength when the coating contacts and is welded to the battery cell 5 later.
[0044] As an example, the first warp conductive wire 11 and the first weft conductive wire 12 are both made of the first conductive copper wire, which includes a copper core layer 13, a first plating layer 14 and a second plating layer 15; the first plating layer 14 and the second plating layer 15 are respectively symmetrically arranged on the outer wall of the copper core layer 13 along the center position of the copper core layer 13.
[0045] The first plating layer 14 is in contact with the battery cell 5, and the second plating layer 15 is disposed away from the battery cell 5; the first plating layer 14 is a plating layer containing silver and graphene materials, and the first plating layer 14 can form good welding and good ohmic contact with the battery cell 5; the second plating layer 15 is a low-cost tin coating.
[0046] Based on the above structure, the purpose of the second plating layer 15 is to protect the copper substrate from oxidation, while the melting of tin during hot-melt soldering strengthens the adhesion between the solder wire and the battery cell 5; the first plating layer 14 can form a good weld and a good ohmic contact with the battery cell 5.
[0047] As an example, the second warp conductive wire 21 and the second weft conductive wire 22 are both made of second conductive copper wire. The second conductive copper wire includes a copper core layer 13, a third plating layer 23 and a fourth plating layer 24. The third plating layer 23 and the fourth plating layer 24 are symmetrically arranged on the outer wall of the copper core layer 13 along the center position of the copper core layer 13.
[0048] The fourth coating layer 24 is in contact with the battery cell 5, while the third coating layer 23 is positioned away from the battery cell 5. The fourth coating layer 24 is a coating layer containing silver and graphene materials, and the fourth coating layer 24 can form good welding and good ohmic contact with the battery cell 5.
[0049] The third coating 23 is a low-cost tin coating; the first warp conductive wire and the first weft conductive wire; as well as the second warp conductive wire and the second weft conductive wire are all integrally formed structures and can be prepared by casting.
[0050] Specifically, the first plating layer 14 and the fourth plating layer 24 can be made of 40-65% tin, 30-40% lead, 10-30% bismuth, 1.5-5% silver, and 0.5-2% graphene, with a total plating thickness of 1-20 μm; the second plating layer 15 and the third plating layer 23 can be made of 40-65% tin, 30-50% lead, and 10-20% bismuth, with a total plating thickness of 1-20 μm.
[0051] Example 2
[0052] like Figure 3As shown, based on the above embodiment 1, this utility model provides a technical solution:
[0053] A battery string includes multiple battery cells and multiple conductive wire structures, with the conductive wire structures arranged between adjacent battery cells to connect the battery cells in series and realize the combination of battery packs.
[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A gridless solar cell conductive filament structure, characterized in that, It includes, but is not limited to, a first conductive wire mesh, a second conductive wire mesh, and a connecting mesh; the first conductive wire mesh and the second conductive wire mesh are both set at a predetermined angle so that the first conductive wire mesh and the second conductive wire mesh are in different planes, and the first conductive wire mesh and the second conductive wire mesh are also provided with reinforcing connection points.
2. The gridless solar cell conductive filament structure as described in claim 1, characterized in that: The first conductive mesh includes first warp conductive wires and first weft conductive wires; multiple first warp conductive wires are arranged in parallel, and the first weft conductive wires are arranged perpendicular to the first warp conductive wires; the first warp conductive wires and the first weft conductive wires are interwoven to form a planar mesh structure.
3. The gridless solar cell conductive filament structure as described in claim 2, characterized in that: The second conductive mesh includes second warp conductive wires and second weft conductive wires; multiple second warp conductive wires are arranged in parallel, and the second weft conductive wires are arranged perpendicular to the second warp conductive wires; the second warp conductive wires and the second weft conductive wires are interwoven to form a planar mesh structure.
4. The gridless solar cell conductive filament structure as described in claim 3, characterized in that: The number of the first warp conductive wires is not less than the number of the first weft conductive wires; the number of the second warp conductive wires is not less than the number of the second weft conductive wires.
5. The gridless solar cell conductive filament structure as described in claim 4, characterized in that: The second conductive wire mesh and the connecting mesh contact portion, as well as the connecting mesh, are not provided with second weft conductive wires; The first conductive wire mesh and the connecting mesh contact portion, as well as the connecting mesh, do not have a first weft conductive wire.
6. The gridless solar cell conductive filament structure as described in claim 5, characterized in that: The reinforcing connection points are located at the intersection of the first warp conductive wire and the first weft conductive wire, and at the intersection of the second warp conductive wire and the second weft conductive wire. The size of the reinforcing connection point is not less than the size of the first warp conductive wire, the first weft conductive wire, the second warp conductive wire, or the second weft conductive wire.
7. A gridless solar cell conductive filament structure as described in any one of claims 1 to 6, characterized in that: Both the first warp conductive wire and the first weft conductive wire are made of first conductive copper wire. The first conductive copper wire includes a copper core layer, a first plating layer and a second plating layer. The first plating layer and the second plating layer are symmetrically arranged on the outer wall of the copper core layer along the center position of the copper core layer. The first plating layer is in contact with the battery cell, and the second plating layer is disposed away from the battery cell.
8. The gridless solar cell conductive filament structure as described in claim 7, characterized in that: Both the second warp conductive wire and the second weft conductive wire are made of second conductive copper wire. The second conductive copper wire includes a copper core layer, a third plating layer and a fourth plating layer. The third plating layer and the fourth plating layer are symmetrically arranged on the outer wall of the copper core layer along the center position of the copper core layer. The fourth plating layer is in contact with the battery cell, and the third plating layer is disposed away from the battery cell.
9. The gridless solar cell conductive filament structure as described in claim 8, characterized in that: The first warp conductive wire and the first weft conductive wire; as well as the second warp conductive wire and the second weft conductive wire, are all integrally formed structures.
10. A battery string, characterized in that: It includes a plurality of battery cells and a plurality of conductive wire structures as described in any one of claims 1 to 9; the conductive wire structures are disposed between adjacent battery cells to connect the battery cells in series.