Battery piece, battery string and photovoltaic module
By designing the first lap weld section in the solar cell to be longer than the second lap weld section, the problem of poor overlap between the welding wire and the sub-busbar is solved, ensuring stable welding of the welding wire at the head of the plate, improving the power generation efficiency and reliability of the solar cell, and reducing production costs.
Patent Information
- Application Number
- CN202422850035.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-21
AI Technical Summary
In the current process of producing solar cells based on OBB technology, the misalignment of the target overlap area between the welding wire and the sub-busbar leads to poor overlap, which reduces the power generation of the solar cell.
The design of the first lap joint of the battery cell is longer than the second lap joint, ensuring that the welding wire provides a larger welding area at the head of the board, reducing the impact of misalignment. The length of the first lap joint at the head of the board is also increased to reduce poor lap joints. The solution is simple and easy to implement, and does not require modification of the welding equipment.
This effectively ensures stable welding of the welding wire and the sub-grid, improves the power generation of the solar cells, reduces production costs, and enhances the reliability and ease of production of solar cells, solar strings, and photovoltaic modules.
Smart Images
Figure CN223488667U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of solar cell technology, and in particular to a solar cell, a solar cell string, and a photovoltaic module. Background Technology
[0002] With continuous innovation in battery technology, the technology has shifted from SMBB (Super Multi-Busba) to OBB (Zero Busbar) technology. In the photovoltaic field, OBB technology refers to the design concept of eliminating the main busbar of the solar cell and replacing its function with welding wire. However, in the current process of producing solar cells based on OBB technology, misalignment between the welding wire and the target overlap area on the sub-busbar leads to poor overlap, reducing the power generation of the solar cell. Utility Model Content
[0003] Therefore, it is necessary to provide a solar cell, solar string, and photovoltaic module to address the problem of poor overlap caused by misalignment between the welding wire and the target overlap area on the sub-busbar during the existing production process of solar cells based on OBB technology.
[0004] The technical solution is as follows:
[0005] In a first aspect, a battery cell is provided, comprising:
[0006] The substrate includes a board head with a first sub-gate and a board tail with a second sub-gate. The first sub-gate has at least one first lap solder portion spaced apart along its own axis. The second sub-gate has at least one second lap solder portion spaced apart along its own axis and corresponding to the first lap solder portion. Along the axis of the first sub-gate, the length of the first lap solder portion is greater than the length of the second lap solder portion.
[0007] The welding wires are at least one in number, and each of the welding wires is spaced apart along the axial direction of the first sub-grid, and is welded to each of the first lap welding parts and each of the second lap welding parts in a one-to-one correspondence.
[0008] The technical solution will be further explained below:
[0009] In one embodiment, the length of the first weld portion along the axial direction of the first sub-gate is 1.0 mm to 3.0 mm.
[0010] In one embodiment, the length of the second weld portion along the axial direction of the first sub-gate is 0.2 mm to 1.0 mm.
[0011] In one embodiment, the first lap joint includes a first conductive solder paste, which is printed on the first sub-gate; the second lap joint includes a second conductive solder paste, which is printed on the second sub-gate.
[0012] In one embodiment, there is at least one first sub-gate, and each first sub-gate is spaced apart on the head of the board along a preset direction. Each welding wire is welded to each first lap weld portion on each first sub-gate in a one-to-one correspondence.
[0013] In one embodiment, the lengths of each of the first weld portions are the same along the axial direction of the first sub-gate.
[0014] In one embodiment, there is at least one second sub-gate, and each second sub-gate is spaced apart on the tail of the plate along the preset direction. Each welding wire is welded to each second lap weld portion on each second sub-gate in a one-to-one correspondence.
[0015] In one embodiment, the substrate is further provided with contact points arranged in a rectangular array, and each contact point is electrically connected to each of the first solder joints and each of the second solder joints in a one-to-one correspondence.
[0016] In a second aspect, a battery string is provided, comprising at least two of the aforementioned battery cells, wherein each of the battery cells is connected in series.
[0017] Thirdly, a photovoltaic module is provided, comprising at least one of the aforementioned battery strings, wherein the battery strings are connected in parallel.
[0018] In the above embodiments, the length of the first lap joint of the solar cell, solar string, and photovoltaic module is greater than the length of the second lap joint. This provides a larger welding area at the head of the plate, ensuring that the welding wire can maintain welding with the first lap joint even after a certain deviation at the head of the plate, reducing the impact of welding wire deviation and thus ensuring the power generation of the solar cell. Furthermore, the solar cell in this application does not require modification of the equipment used for welding wire. Based on the accuracy of the equipment, the length of the first lap joint at the head of the plate along the axis of the first sub-grid can be increased to reduce poor overlap between the welding wire and the first sub-grid. This solution is simple and easy to implement. Attached Figure Description
[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the structure of a battery cell in one embodiment when the welding wire is in a normal overlapping state.
[0022] Figure 2 for Figure 1 A schematic diagram of the structure of a solar cell when the welding wire is in an offset overlapping state.
[0023] Figure 3 for Figure 2 A magnified view of part A in the middle.
[0024] Figure 4 This is a schematic diagram of the structure of a battery string in one embodiment.
[0025] Explanation of reference numerals in the attached figures:
[0026] 10. Battery string; 100. Battery cell; 110. Substrate; 111. First sub-grid; 112. Board head; 113. Second sub-grid; 114. Board tail; 115. First lap weld; 116. Second lap weld; 120. Welding wire. Detailed Implementation
[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0028] To address the issue of poor overlap and reduced power generation in existing OBB-based solar cell production processes due to misalignment between the welding wire and the target overlap area on the sub-busbar, the inventors, based on mass production statistical analysis, discovered that the welding wire misalignment is primarily concentrated at the head of the solar cell. Further analysis revealed that this concentration at the head of the solar cell is caused by the low precision of existing welding equipment and the welding process where the welding wire is welded from the end closer to the tail of the solar cell towards the end closer to the head. Along the welding direction, the welding wire misalignment gradually increases, reaching its maximum at the head of the solar cell. Therefore, the welding wire is more prone to misalignment at the head of the solar cell, leading to poor overlap with the target overlap area on the sub-busbar.
[0029] Based on this, the following embodiments of the battery cells, battery strings, and photovoltaic modules of this application are proposed to solve the above-mentioned technical problems.
[0030] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, a battery cell 100 is provided, including a substrate 110 and a welding wire 120. The substrate 110 includes a head portion 112 with a first sub-grid 111 and a tail portion 114 with a second sub-grid 113. The first sub-grid 111 has at least one first bonding portion 115 spaced apart along its own axis. The second sub-grid 113 has at least one second bonding portion 116 spaced apart along its own axis and corresponding one-to-one with the first bonding portions 115. Along the axial direction of the first sub-grid 111 (e.g., ... Figure 2 (As shown in direction B), the length of the first lap weld 115 is greater than the length of the second lap weld 116. There is at least one welding wire 120, and each welding wire 120 is spaced apart along the axial direction of the first sub-gate 111 and is welded to each of the first lap weld 115 and each of the second lap weld 116 in a one-to-one correspondence.
[0031] In the above embodiment, the length of the first lap weld portion 115 of the battery cell 100 is greater than the length of the second lap weld portion 116, so as to provide a larger welding area at the board head 112. This ensures that even if the welding wire 120 deviates to a certain extent at the board head 112, it can still maintain welding with the first lap weld portion 115, reducing the impact of the welding wire 120's deviation, thereby ensuring the power generation of the battery cell 100. In addition, the battery cell 100 in this application does not require modification of the equipment used for welding the welding wire 120. Based on the accuracy of the equipment, the length of the first lap weld portion 115 at the board head 112 along the axial direction of the first sub-grid 111 can be increased to reduce poor overlap between the welding wire 120 and the first sub-grid 111. The solution is simple and easy to implement.
[0032] The substrate 110 can be configured as any structure in the prior art for converting light energy into electrical energy. Specifically, in this embodiment, the substrate 110 can be configured as a semiconductor substrate.
[0033] It should be noted that both the first welded portion 115 and the second welded portion 116 have a certain degree of weldability. The area on the first sub-gate 111 without the first welded portion 115 is designated as the first non-lapped area. The area on the second sub-gate 113 without the second welded portion 116 is designated as the second non-lapped area. The weldability of both the first and second non-lapped areas is poor.
[0034] The shape and dimensions of the second lap welding portion 116 are the same as those of the lap welding portion used for welding wires to sub-grids in existing battery cells. The length of the first lap welding portion 115 along the axial direction of the first sub-grid 111 and the length of the second lap welding portion 116 along the axial direction of the first sub-grid 111 can be flexibly designed and adjusted according to actual usage needs.
[0035] Optionally, the length of the first weld joint 115 along the axial direction of the first sub-gate 111 is 1.0 mm to 3.0 mm. The length of the second weld joint 116 along the axial direction of the first sub-gate 111 is 0.2 mm to 1.0 mm. Specifically, in this embodiment, the length of the first weld joint 115 along the axial direction of the first sub-gate 111 can be 1.2 mm, and the length of the second weld joint 116 along the axial direction of the first sub-gate 111 can be 0.6 mm.
[0036] Optionally, the first bonding portion 115 includes a first conductive welding paste, which is printed on the first sub-grid 111. Thus, the first bonding portion 115 is disposed on the first sub-grid 111 by printing. When the length of the first bonding portion 115 needs to be adjusted, it can be achieved by adjusting the corresponding opening size on the printing screen, improving the convenience of battery cell 100 production.
[0037] Optionally, the second bonding portion 116 includes a second conductive welding paste, which is printed on the second sub-grid 113. Thus, the second bonding portion 116 is printed onto the second sub-grid 113. When the length of the second bonding portion 116 needs to be adjusted, this can be achieved by adjusting the corresponding opening size on the printing screen, improving the ease of production of the battery cell 100.
[0038] The number of first sub-gates 111, the number of first welded portions 115 on each first sub-gate 111, the number of second sub-gates 113, the number of second welded portions 116 on each second sub-gate 113, and the number of welding wires 120 can all be flexibly adjusted according to actual usage needs. Specifically, in this embodiment, the number of first welded portions 115 on each first sub-gate 111, the number of second welded portions 116 on each second sub-gate 113, and the number of welding wires 120 are all the same.
[0039] like Figure 1 and Figure 2 As shown, in one embodiment, there is at least one first sub-gate 111, and each first sub-gate 111 is arranged along a predetermined direction (e.g., Figure 2 The welding wires 120 are spaced apart on the head 112 of the plate (as shown in direction C), and each welding wire 120 is welded to each first lap welding part 115 on each first sub-grid 111 in a one-to-one correspondence. In this way, the current at the head 112 of the plate can be evenly concentrated on the welding wires 120 through each first sub-grid 111, thereby improving the reliability of the solar cell 100.
[0040] The preset direction can be flexibly adjusted according to actual usage needs. Specifically, in this embodiment, the preset direction can be set to the width direction of the substrate 110. The axial direction of the first sub-gate 111 can be set to the length direction of the substrate 110.
[0041] like Figure 2 and Figure 4 As shown, optionally, the lengths of each first weld joint 115 along the axial direction of the first sub-grid 111 are the same. This improves the ease of manufacturing the battery cell 100.
[0042] In other embodiments, the lengths of the first weld joints 115 along the axial direction of the first sub-grid 111 may also be different. For example, the lengths of the first weld joints 115 on each first sub-grid 111 along the axial direction of the first sub-grid 111 may be the same, and the lengths of the first weld joints 115 on different first sub-grids 111 gradually increase along the axial direction of the first sub-grid 111 in the direction from the tail 114 to the head 112. This reduces the production cost of the solar cell 100.
[0043] like Figure 2 As shown, optionally, there is at least one second sub-grid 113, and each second sub-grid 113 is spaced apart on the tail portion 114 of the plate along a predetermined direction. Each welding wire 120 is welded to each second lap welding portion 116 on each second sub-grid 113 in a one-to-one correspondence. In this way, the current at the tail portion 114 of the plate can be uniformly concentrated onto the welding wire 120 through each second sub-grid 113, thereby improving the reliability of the solar cell 100.
[0044] Specifically, in this embodiment, the substrate 110 is further provided with contact points arranged in a rectangular array, and each contact point is electrically connected to each first bonding portion 115 and each second bonding portion 116 in a one-to-one correspondence. In this way, each welding wire 120 cooperates with each first sub-gate 111 and second sub-gate 113 to form a grid structure. The grid structure can uniformly and reliably transmit the current generated on the substrate 110, thereby improving the reliability of the solar cell 100.
[0045] like Figure 4 As shown, in one embodiment, a battery string 10 is provided, comprising at least two battery cells 100 as described in any of the above embodiments, with each battery cell 100 connected in series. Thus, the battery string 10 possesses all the technical effects of the aforementioned battery cells 100, while reducing the production cost of the battery string 10.
[0046] The series connection method between the individual solar cells 100 can adopt any of the existing technologies for connecting solar cells 100 in series.
[0047] In one embodiment, a photovoltaic module is provided, including at least one cell string 10 as described in any of the above embodiments, with each cell string 10 connected in parallel. Thus, the photovoltaic module possesses all the technical effects of the aforementioned cell 100 and cell string 10, while reducing the production cost of the photovoltaic module.
[0048] The parallel connection method between each battery string 10 can adopt any of the existing technologies for parallel connection of battery strings 10.
[0049] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0050] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0052] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0053] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0054] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.
[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0056] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A battery cell, characterized in that, include: The substrate (110) includes a board head (112) with a first sub-gate (111) and a board tail (114) with a second sub-gate (113). The first sub-gate (111) has at least one first bonding portion (115) spaced apart along its own axis. The second sub-gate (113) has at least one second bonding portion (116) spaced apart along its own axis and corresponding one-to-one with the first bonding portion (115). Along the axis of the first sub-gate (111), the length of the first bonding portion (115) is greater than the length of the second bonding portion (116). There is at least one welding wire (120), and each of the welding wires (120) is spaced apart along the axial direction of the first sub-gate (111) and is welded to each of the first lap welding parts (115) and each of the second lap welding parts (116) in a one-to-one correspondence.
2. The battery cell according to claim 1, characterized in that, The length of the first welded portion (115) along the axial direction of the first sub-gate (111) is 1.0 mm to 3.0 mm.
3. The battery cell according to claim 1, characterized in that, The length of the second welded portion (116) along the axial direction of the first sub-gate (111) is 0.2 mm to 1.0 mm.
4. The battery cell according to claim 1, characterized in that, The first lap soldering part (115) includes a first conductive soldering paste, which is printed on the first sub-gate (111); the second lap soldering part (116) includes a second conductive soldering paste, which is printed on the second sub-gate (113).
5. The battery cell according to any one of claims 1 to 4, characterized in that, There is at least one first sub-gate (111), and each first sub-gate (111) is spaced apart on the head (112) of the plate along a preset direction. Each welding wire (120) is welded to each first lap weld portion (115) on each first sub-gate (111) in a one-to-one correspondence.
6. The battery cell according to claim 5, characterized in that, Along the axial direction of the first sub-gate (111), each of the first lap weld portions (115) has the same length.
7. The battery cell according to claim 5, characterized in that, There is at least one second sub-gate (113), and each second sub-gate (113) is spaced apart on the tail of the plate (114) along the preset direction. Each welding wire (120) is welded to each second lap welding part (116) on each second sub-gate (113) in a one-to-one correspondence.
8. The battery cell according to claim 7, characterized in that, The substrate (110) is also provided with contact points arranged in a rectangular array, and each contact point is electrically connected to each of the first solder joints (115) and each of the second solder joints (116) in a one-to-one correspondence.
9. A battery string, characterized in that, It includes at least two solar cells (100) as described in any one of claims 1 to 8, wherein each of the solar cells (100) is connected in series.
10. A photovoltaic module, characterized in that, It includes at least one battery string (10) as described in claim 9, wherein each of the battery strings (10) is connected in parallel.