Battery piece, battery string and photovoltaic module
By using auxiliary welding wire instead of auxiliary grid and main welding wire instead of main grid in photovoltaic cells, and simplifying the slurry design, the problem of high production cost of photovoltaic cells in 0BB technology is solved, and cost reduction and efficiency improvement are achieved.
Patent Information
- Application Number
- CN202422850076.5
- 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
The production cost of existing photovoltaic cells produced based on OBB technology is relatively high.
Auxiliary welding wire is used to replace the auxiliary grid structure, and main welding wire is used to replace the main grid structure. Only contact points are printed on the substrate. The auxiliary contact point group does not consider the aspect ratio factor. The slurry design formula is simple, and the battery cell has no auxiliary grid design. It is suitable for HJT, TOPCon and BC batteries.
It reduces slurry consumption and printing screen costs, improves battery production efficiency and reliability, has strong scalability, and is suitable for a variety of battery types.
Smart Images
Figure CN223488668U_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. OBB technology, in the photovoltaic field, refers to a design concept that eliminates the main busbars in the solar cell. This design reduces the amount of silver paste used by decreasing the number of busbars, thereby reducing costs and improving production efficiency. OBB technology has significant economic and practical advantages in the production of photovoltaic cells, especially suitable for the manufacture of heterojunction (HJT) cells. However, the production cost of photovoltaic cells based on existing OBB technology remains relatively high. Utility Model Content
[0003] Therefore, it is necessary to provide a cell, cell string, and photovoltaic module to address the issue that the production cost of photovoltaic cells based on OBB technology is still relatively high in the existing technology.
[0004] The technical solution is as follows:
[0005] In a first aspect, a battery cell is provided, comprising:
[0006] The substrate is provided with at least one group of secondary contact points, and each group of secondary contact points is spaced apart along a first direction.
[0007] At least one auxiliary welding wire is provided, and each auxiliary welding wire is spaced apart along the first direction and electrically connected to each of the auxiliary contact point groups in a one-to-one correspondence.
[0008] The number of main welding wires is at least one, and each of the main welding wires is spaced apart along the second direction. Each of the main welding wires intersects with and is electrically connected to each of the auxiliary welding wires.
[0009] The first direction and the second direction are set at an angle.
[0010] The technical solution will be further explained below:
[0011] In one embodiment, the substrate is further provided with a number of main contact point groups that are the same as the number of main welding wires. Each of the main contact point groups is spaced apart along the second direction and is electrically connected to each of the main welding wires.
[0012] In one embodiment, each of the secondary contact point groups includes at least one secondary contact point spaced apart along the second direction, and each of the secondary welding wires is electrically connected to all the secondary contact points in the corresponding secondary contact point group; each of the primary contact point groups includes at least one primary contact point spaced apart along the first direction, and each of the primary welding wires is electrically connected to all the primary contact points in the corresponding primary contact point group.
[0013] In one embodiment, along the second direction, at least one secondary contact point is provided on both sides of each of the primary contact points.
[0014] In one embodiment, the number of main contact points in each main contact point group is the same as the number of secondary contact point groups.
[0015] In one embodiment, the intersection of each of the auxiliary welding wires and each of the main welding wires is located at each of the main contact points, and is welded to each of the main contact points.
[0016] In one embodiment, the first direction is perpendicular to the second direction.
[0017] In one embodiment, the diameter of the main welding wire is larger than the diameter of the auxiliary welding wire.
[0018] 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.
[0019] Thirdly, a photovoltaic module is provided, comprising at least one of the aforementioned battery strings, wherein the battery strings are connected in parallel.
[0020] In the above embodiments, the solar cells, solar strings, and photovoltaic modules, during use, involve the substrate absorbing light energy and converting it into current. This current is then transmitted to the secondary welding wires via the secondary contact point group. The main welding wire collects and aggregates the current from each secondary welding wire for centralized storage and power supply. Compared to existing photovoltaic cells, the solar cells, solar strings, and photovoltaic modules of this application have at least the following advantages:
[0021] 1. The auxiliary welding wire replaces the original auxiliary grid structure, and the main welding wire replaces the original main grid structure. The solar cell has no main grid or auxiliary grid, which reduces the consumption of slurry and further reduces production costs.
[0022] 2. Only contact points can be printed on the substrate, the requirements for the opening of the printing screen are not high, the cost of the printing screen is low, and the production cost of the solar cell is further reduced.
[0023] 3. The secondary contact point group can only serve the function of electrical connection, without having to consider the aspect ratio. The paste design formula is simple, the paste cost is reduced, and the production cost of the solar cell is further reduced.
[0024] 4. The cell has no sub-grid design, which has strong scalability and can be used in HJT cells, TOPCon cells and BC cells, etc. Attached Figure Description
[0025] 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.
[0026] 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.
[0027] Figure 1 This is a schematic diagram of the structure of a battery cell according to one embodiment.
[0028] Figure 2 for Figure 1 A schematic diagram of the structure of a solar cell after the main and auxiliary welding wires have been removed.
[0029] Figure 3 for Figure 1 A magnified view of part A in the middle.
[0030] Figure 4 This is a schematic diagram of the structure of a battery string in one embodiment.
[0031] Explanation of reference numerals in the attached figures:
[0032] 10. Battery string; 100. Battery cell; 110. Substrate; 120. Secondary contact group; 121. Secondary contact; 130. Secondary welding wire; 140. Main welding wire; 150. Main contact group; 151. Main contact. Detailed Implementation
[0033] 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.
[0034] like Figure 1 and Figure 2As shown, in one embodiment, a battery cell 100 is provided, including a substrate 110, a secondary welding wire 130, and a main welding wire 140. The substrate 110 is provided with at least one secondary contact point group 120, each secondary contact point group 120 being arranged along a first direction (e.g., ...). Figure 2 The auxiliary welding wires 130 are spaced apart along the first direction (as shown in B in the diagram). There is at least one auxiliary welding wire 130, and each auxiliary welding wire 130 is spaced apart along the first direction and electrically connected to each auxiliary contact point group 120 in a one-to-one correspondence. There is at least one main welding wire 140, and each main welding wire 140 is spaced apart along the second direction (as shown in B in the diagram). Figure 2 The main welding wire 140 and each auxiliary welding wire 130 are intersected and electrically connected in the direction shown in C. The first direction and the second direction are set at an angle.
[0035] In the above embodiment, the solar cell 100, when in use, has a substrate 110 that absorbs light energy and converts it into current. The current is transmitted to the sub-welding wires 130 through the sub-contact point group 120. The main welding wire 140 collects and gathers the current from each sub-welding wire 130 for centralized storage and power supply. Compared with photovoltaic cells in the prior art, the solar cell 100 in this application has at least the following advantages: 1. The sub-welding wires 130 replace the original sub-busbar structure, and the main welding wires 140 replace the original main busbar structure. The solar cell 100 has no main busbar or sub-busbar, reducing the amount of paste consumed and further lowering production costs. 2. Only contact points can be printed on the substrate 110, requiring less stringent screen opening and lowering screen printing costs, further reducing the production cost of the solar cell 100. 3. The sub-contact point group 120 can only serve as an electrical connection, without considering aspect ratio factors, simplifying the paste design and reducing paste costs, further lowering the production cost of the solar cell 100. 4. The battery cells feature a 100% gridless design, offering strong scalability and compatibility with HJT batteries, TOPCon batteries, and BC batteries.
[0036] The substrate 110 can be configured as any structure in the prior art capable of absorbing light energy and converting it into electrical energy. For example, the substrate 110 can be configured as a semiconductor substrate.
[0037] In this specific embodiment, the number of auxiliary welding wires 130 is the same as the number of auxiliary contact point groups 120.
[0038] like Figure 1 and Figure 2 As shown, optionally, the substrate 110 also has a number of main contact point groups 150 equal to the number of main welding wires 140. Each main contact point group 150 is spaced apart along the second direction and is electrically connected to each main welding wire 140. Thus, the main welding wires 140 are welded and fixed to the substrate 110 through the main contact points 151, ensuring that each main welding wire 140 and each auxiliary welding wire 130 cooperate to form a welding wire mesh for stable and reliable current transmission, thereby improving the reliability of the solar cell 100.
[0039] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, each sub-contact group 120 includes at least one sub-contact 121 spaced apart along a second direction, and each sub-welding wire 130 is electrically connected to all sub-contacts 121 in its corresponding sub-contact group 120. Each main contact group 150 includes at least one main contact 151 spaced apart along a first direction, and each main welding wire 140 is electrically connected to all main contact 151 in its corresponding main contact group 150. Thus, the welding wire mesh can uniformly and reliably collect and converge current, improving the reliability of the solar cell 100.
[0040] like Figure 2 and Figure 3 As shown, optionally, the main contact point 151 and the adjacent secondary contact point 121 are spaced apart. This ensures that the welding position of the secondary welding wire 130 and the secondary contact point 121 will not interfere with the welding position of the main welding wire 140 and the main contact point 151, thereby improving the reliability of the battery cell 100.
[0041] like Figure 2 and Figure 3 As shown, optionally, along the second direction, each main contact point 151 has at least one secondary contact point 121 on both sides. In this way, by rationally arranging the positions of the main contact points 151, the main welding wire 140 can collect and converge the current on each secondary welding wire 130 with a smaller number of wires, thereby reducing the production cost of the battery cell 100.
[0042] Specifically, in this embodiment, the number of main contact points 151 in each main contact point group 150 is the same as the number of auxiliary contact point groups 120. In this way, the number of contact surfaces between the main welding wire 140 and the main contact points 151 is increased, ensuring that the main welding wire 140 can be welded and fixed to the substrate 110 through each main contact point 151, thereby improving the reliability of the battery cell 100.
[0043] Specifically, in this embodiment, the main contact point groups 150 are arranged in a linear array along the second direction. The secondary contact points 121 between two adjacent main contact point groups 150 are arranged in a rectangular array.
[0044] like Figure 3 As shown, optionally, the intersection points of each auxiliary welding wire 130 and each main welding wire 140 are located at each main contact point 151, and are welded to each main contact point 151. In this way, the main welding wire 140, auxiliary welding wire 130 and main contact point 151 are welded and fixed together, improving the reliability of the battery cell 100.
[0045] The angle between the first direction and the second direction can be flexibly adjusted according to actual usage needs.
[0046] like Figure 2 As shown, optionally, the first direction is perpendicular to the second direction. In this way, all the main contact points 151 and all the secondary contact points 121 can cooperate to form a rectangular array structure, improving the ease of production of the battery cell 100.
[0047] Specifically, in this embodiment, the first direction can be set as the width direction of the substrate 110. The second direction can be set as the length direction of the substrate 110.
[0048] The number of auxiliary welding wires 130 and main welding wires 140 can be flexibly adjusted according to actual usage needs. The diameters of both auxiliary welding wires 130 and main welding wires 140 can be flexibly adjusted according to actual usage needs.
[0049] like Figure 1 and Figure 3 As shown, in one embodiment, the diameter of the main welding wire 140 is larger than the diameter of the auxiliary welding wire 130. Thus, the current density within the auxiliary welding wire 130 is lower, and the narrower auxiliary welding wire 130 can reduce the light-shielding area while ensuring smooth internal current transmission, increasing the light-receiving area on the substrate 110. Simultaneously, the current density within the main welding wire 140 is higher, and the wider main welding wire 140 can ensure smooth internal current transmission, reducing transmission resistance and improving the power generation of the solar cell 100.
[0050] Specifically, in this embodiment, the area of the main contact point 151 used for electrical connection with the main welding wire 140 is larger than the area of the secondary contact point 121 used for electrical connection with the secondary welding wire 130.
[0051] 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.
[0052] The series connection method between the individual solar cells 100 can adopt any of the existing technologies for connecting solar cells 100 in series.
[0053] 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.
[0054] The parallel connection method between each battery string 10 can adopt any of the existing technologies for parallel connection of battery strings 10.
[0055] 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.
[0056] 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.
[0057] 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.
[0058] 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.
[0059] 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.
[0060] 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.
[0061] 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.
[0062] 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) is provided with at least one sub-contact point group (120), and each of the sub-contact point groups (120) is spaced apart along a first direction; At least one auxiliary welding wire (130) is provided, and each of the auxiliary welding wires (130) is spaced apart along the first direction and electrically connected to each of the auxiliary contact point groups (120) in a one-to-one correspondence. There is at least one main welding wire (140), and each of the main welding wires (140) is spaced apart along the second direction. Each of the main welding wires (140) intersects with and is electrically connected to each of the auxiliary welding wires (130). The first direction and the second direction are set at an angle.
2. The battery cell according to claim 1, characterized in that, The substrate (110) is also provided with a number of main contact point groups (150) that are the same as the number of main welding wires (140). Each of the main contact point groups (150) is spaced apart along the second direction and is electrically connected to each of the main welding wires (140).
3. The battery cell according to claim 2, characterized in that, Each of the sub-contact point groups (120) includes at least one sub-contact point (121) spaced apart along the second direction, and each of the sub-welding wires (130) is electrically connected to all the sub-contact points (121) in the corresponding sub-contact point group (120); each of the main contact point groups (150) includes at least one main contact point (151) spaced apart along the first direction, and each of the main welding wires (140) is electrically connected to all the main contact points (151) in the corresponding main contact point group (150).
4. The battery cell according to claim 3, characterized in that, Along the second direction, each of the main contact points (151) has at least one secondary contact point (121) on both sides.
5. The battery cell according to claim 4, characterized in that, The number of main contact points (151) in each of the main contact point groups (150) is the same as the number of secondary contact point groups (120).
6. The battery cell according to claim 3, characterized in that, The intersection of each of the auxiliary welding wires (130) and each of the main welding wires (140) is located at each of the main contact points (151) and is welded to each of the main contact points (151).
7. The battery cell according to any one of claims 1 to 6, characterized in that, The first direction is perpendicular to the second direction.
8. The battery cell according to any one of claims 1 to 6, characterized in that, The diameter of the main welding wire (140) is larger than the diameter of the auxiliary welding wire (130).
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.