Solar cell without main grid
By adding multiple sets of contact points in the main gateless solar cell, the problems of dummy welding and de-soldering caused by poor contact between the welding tape and the secondary gate are solved, and high reliability and high proportion of qualified products are achieved in the component string welding process.
Patent Information
- Application Number
- CN202421533706.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-01
AI Technical Summary
During the series welding and interconnection of the module ends of existing main gate-free solar cells, the welding tape and the secondary gate line have poor contact, resulting in dummy welding or de-soldering.
Design a solar cell without a main gate, adding multiple sets of contact points, and the contact points and the secondary gate are arranged in the first direction of the cell, and the contact points are much larger than the secondary gate. Therefore, during the component series welding process, the welding tape is mainly interconnected with the contact points to avoid the risks of false welding and desoldering.
By increasing the contact points, the welding tape is mainly interconnected with the contact points, which significantly reduces the risks of false welding and desoldering, and improves the reliability of components and the proportion of EL qualified products.
Smart Images
Figure CN223040503U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of batteries, in particular to a main-gridless solar cell. Background Art
[0002] At present, the metal electrode patterns of mainstream photovoltaic solar cells all have the design of main grids and sub-grids. One of the functions of the main grid is to firmly connect with the solder tape during the series soldering of components, thereby enhancing the reliability of the components. The metal electrode pattern of the existing main-gridless solar cell is modified based on the pattern of the main-grid cell, that is, the main-grid design is removed, and other designs are retained, such as Figure 1 As shown, the existing metal electrode pattern of the main-gridless cell only has the sub-grid design, and the printing width of the sub-grid lines is usually 20-30um. During the series soldering and interconnection process at the component end, there is a great risk of poor contact between the solder tape and the sub-grid lines, resulting in virtual soldering or desoldering phenomena, which are shown as shadows in the EL test image. Summary of the Utility Model
[0003] The purpose of the utility model is to design a main-gridless solar cell to solve the above problems.
[0004] The utility model realizes the above purpose through the following technical solutions:
[0005] A main-gridless solar cell includes a cell and multiple groups of sub-grids, and also includes multiple groups of contact points. The multiple groups of contact points and the multiple groups of sub-grids are arranged along the first direction of the cell. One group of contact points is located between adjacent two groups of sub-grids. One group of contact points includes multiple contact points. The multiple contact points of the same group of contact points are arranged along the second direction of the cell. The first direction is perpendicular to the second direction, and the first direction and the second direction are in the same plane.
[0006] The beneficial effect of the utility model is that contact points are added between the sub-grids. Since the size area of the contact points is much larger than that of the sub-grids, during the series soldering process of the components, the solder tape will mainly be interconnected with the contact points, thus avoiding the risks of virtual soldering and desoldering of the solder tape. Description of the Drawings
[0007] Figure 1 is a schematic structural diagram of the existing main-gridless cell in the background art;
[0008] Figure 2 is a schematic structural diagram of a main-gridless solar cell of the utility model;
[0009] Figure 3 is an enlarged schematic diagram of the contact points in a main-gridless solar cell of the utility model;
[0010] Figure 4 is an enlarged schematic diagram of the gradually widening sub-grids in a main-gridless solar cell of the utility model;
[0011] The corresponding reference numerals are as follows:
[0012] 1 - solar cell, 2 - auxiliary grid, 3 - contact point. Specific embodiments
[0013] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.
[0014] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.
[0015] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0016] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model 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 utility model.
[0017] In addition, the terms "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.
[0018] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, terms such as "set", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0019] The specific embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.
[0020] Figure 2 、 Figure 3 、 Figure 4 As shown in [figures not provided], a main-gridless solar cell includes a cell 1 and multiple sets of sub-grids 2, and also includes multiple sets of contact points 3. The multiple sets of contact points 3 and the multiple sets of sub-grids 2 are arranged along a first direction of the cell 1. One set of contact points 3 is located between two adjacent sets of sub-grids 2. One set of contact points 3 includes multiple contact points 3. The multiple contact points 3 of the same set of contact points 3 are arranged along a second direction of the cell 1. The first direction is perpendicular to the second direction, and the first direction and the second direction are in the same plane.
[0021] The contact point 3 is of a rectangular structure.
[0022] The length of the contact point 3 is 1 mm and the width is 0.5 mm.
[0023] One set of sub-grids 2 includes multiple rows of sub-grids 2.
[0024] For the multiple rows of sub-grids 2 in one set of sub-grids 2, along the direction of the sub-grid 2, that is, Figure 2 in one set of sub-grids, the width of the sub-grid gradually becomes wider and then narrower from top to bottom or from bottom to top.
[0025] The width of the sub-grid 2 gradually changes from 25 μm to 60 μm and then narrows to 25 μm. The length of the sub-grid 2 is 1.2 mm.
[0026] The working principle of the main-gridless solar cell of the present utility model is as follows:
[0027] The sub-grid 2 is consistent with the existing pattern
[0028] The contact point 3 is rectangular, with dimensions of length 1 mm * width 0.5 mm, and there are 60 in total.
[0029] Gradually thickened, the sub-grid 2 with a width of 25 μm gradually widens to 60 μm and has a length of 1.2 mm. The number of this design is determined by the number of sub-grids 2, and usually the number is 2000 - 5000.
[0030] The cell 1 of the present utility model is increased with contact points 3, as shown in Figure 2 and Figure 3 As shown, since the size and area of the contact point 3 are much larger than those of the sub-grid 2, during the component string soldering process, the solder tape will mainly be interconnected with the contact point 3, thus avoiding the risks of solder tape virtual soldering and desoldering.
[0031] The sub-grid 2 of the present utility model is increased with a gradually thickened design, as shown in Figure 4As shown, in the area where the auxiliary grid 2 is in interconnected contact with the solder strip, a gradually increasing and thickening design is added, which increases the welding contact area between the solder strip and the auxiliary grid 2. On the one hand, it reduces the risk of poor soldering, and on the other hand, it also reduces the risk of the solder strip fusing the auxiliary grid 2 during the high-temperature lamination process of the module, ultimately increasing the proportion of qualified EL products of the module.
[0032] The design of the present utility model can be applied to the front or back of a solar cell.
[0033] The technical solution of the present utility model is not limited to the limitations of the above specific embodiments. Any technical deformation made according to the technical solution of the present utility model falls within the protection scope of the present utility model.
Claims
1. A busbar-free solar cell, comprising a cell and multiple groups of sub-grids, characterized in that: It also includes multiple groups of contact points, which are arranged along the first direction of the battery cell and the multiple groups of sub-grids. One group of contact points is located between two adjacent groups of sub-grids. One group of contact points includes multiple contact points. Multiple contact points in the same group of contact points are arranged along the second direction of the battery cell. The first direction is perpendicular to the second direction, and the first direction and the second direction are located on the same plane.
2. A busbar-free solar cell according to claim 1, characterized in that: The contact point is a rectangular structure.
3. A busbar-free solar cell according to claim 2, characterized in that: The contact point is 1 mm long and 0.5 mm wide.
4. The busbar-free solar cell according to claim 1, characterized in that: A set of sub-grids includes a plurality of rows of sub-grids.
5. A busbar-free solar cell according to claim 4, characterized in that: In a group of sub-grids, there are multiple rows of sub-grids, and their width gradually widens and then narrows along the direction of the sub-grids.
6. A busbar-free solar cell according to claim 5, characterized in that: The width of the sub-grid gradually widens from 25um to 60um, and then narrows to 25um. The length of the sub-grid is 1.2mm.