Solar Topcon cell front face non-main-grid pattern structure
By designing a main gateless graphic structure, the silver paste consumption of Topcon battery cells is reduced, and the problem of high silver paste consumption in the prior art is solved, resulting in high manufacturing costs, and the effect of reducing costs and improving battery efficiency is achieved.
Patent Information
- Application Number
- CN202421275294.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-05
AI Technical Summary
During the manufacturing process of existing Topcon batteries, silver paste consumes high during metallized electrode pattern printing, resulting in higher manufacturing costs.
A pattern structure without a main gate on the front of the solar-energy Topcon battery is designed. By printing several parallel sub gate lines on the front of the battery cell along the second direction, and setting a gradient bold section in the preset area of the main gate line, the silver paste consumption of the printing main gate line is reduced.
It directly reduces the silver paste consumption of the battery cell by about 20%, effectively reduces the cost, and improves the efficiency and current output of the battery cell.
Smart Images
Figure CN222621524U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of solar cell manufacturing, in particular to a solar Topcon cell front side non-main grid graphic structure. Background Art
[0002] As crystalline silicon solar cell technology continues to mature and advance, cell efficiency and manufacturing costs have gradually become the primary issues to be considered in cell process optimization and new technology development.
[0003] At present, Topcon batteries have attracted much attention in the industry due to their advantages such as high conversion efficiency, low temperature coefficient, and no PID and LID attenuation problems of P-type silicon wafers. They have become the mainstream mass production technology in the industry. However, Topcon batteries also have the disadvantage of high manufacturing cost, especially the metallized electrode graphic printing module. Since silver paste is required on both sides of the battery, the silver paste consumption is large and the unit price of silver paste is high. The cost of the entire silver metal electrode accounts for 20-30% of the battery material cost. Therefore, reducing the silver paste consumption of Topcon batteries is very important to reduce the battery manufacturing cost. Utility Model Content
[0004] The purpose of the utility model is to propose a solar Topcon battery front side non-busbar pattern structure to address the problem of high silver paste consumption and high cost when printing metallized electrode patterns in the existing Topcon battery manufacturing process. The non-busbar pattern printing structure directly reduces the silver paste consumption of the battery cell by 20%, effectively reducing the cost.
[0005] In order to achieve the above object, the utility model is realized by the following technical solutions:
[0006] The utility model proposes a solar Topcon cell front-side non-main-grid graphic structure, comprising a Topcon cell sheet, wherein the Topcon cell sheet has a first direction and a second direction perpendicular to each other; a plurality of columns of main-grid line preset areas are arranged in parallel along the first direction on the front side of the Topcon cell sheet, and the main-grid lines are not printed in the main-grid line preset areas of each column, and the length direction of the main-grid line preset areas is extended along the second direction; a plurality of mutually parallel auxiliary grid lines are printed along the second direction on the front side of the Topcon cell sheet, and a plurality of gradually changing thickened sections are printed on each auxiliary grid line, and the thickened sections are arranged in the main-grid line preset areas; welding contact points are printed at both ends of each main-grid line preset area, and the welding contact points are connected to the auxiliary grid lines.
[0007] Furthermore, a solar Topcon cell has no main grid graphic structure on the front side: a plurality of thickened segments are printed on the secondary grid line along its length direction, and the thickened segments are arranged in a symmetrical structure, which presents a structure that gradually becomes thicker and then gradually becomes thinner.
[0008] Furthermore, a solar Topcon cell has no main grid graphic structure on the front: the bold segment is a three-level gradient combination graphic structure, which is formed by a combination of trapezoid + rectangle + trapezoid.
[0009] Furthermore, a solar Topcon cell has a main grid-free graphic structure on the front side: the length of the thickened segment is set to 0.3-0.8 mm, the width of the thickest part of the thickened segment is set to 0.05-0.10 mm, and the width of the thinnest part is set to 0.01-0.02 mm.
[0010] Furthermore, a solar Topcon cell has no main grid pattern structure on the front side: the welding contact points are arranged as a rectangular structure.
[0011] Furthermore, a solar Topcon cell has no main grid pattern structure on the front side: the width of the welding contact point along the first direction is set to 0.5-1.0 mm, and the length along the second direction is set to 1.0-1.5 mm.
[0012] Furthermore, a solar Topcon cell has a front-side busbar-free graphic structure: the spacing between preset areas of each column of busbar lines is set to 7.0 to 10.0 mm.
[0013] Beneficial effects of the utility model:
[0014] (1) The solar Topcon cell designed by the utility model has a front-side busbar-free graphic structure. Compared with the current mainstream printed graphic structure, it saves the silver paste consumption of the printed busbars, and can directly reduce the silver paste consumption of the cell by about 20%. In addition, the busbar-free graphic technology also reduces the light blocking of the busbars, that is, reduces the shading area, which can significantly improve the electrical performance current Isc of the cell, thereby bringing about a gain in the efficiency Eta of the cell.
[0015] (2) The solar Topcon battery of the utility model has a non-main grid graphic structure design on the front, which can save about 20% of the silver paste consumption and effectively reduce the cost. The thickened segment set on the secondary grid line can reduce the subsequent poor welding of the battery interconnection strips, reduce the poor printing of the battery end, and prevent the broken grid. At the same time, the gradual thickened segment structure design can also reduce the silver paste printing consumption of the thickened segment while ensuring the effective lap transmission area of the interconnection strip (collecting current to prevent welding broken grid, ensuring the reliability technical indicators such as welding tension), further reducing the cost. The welding contact points set in the utility model also further ensure the effective lap transmission area of the interconnection strips in the battery assembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 A schematic diagram of a solar Topcon cell front side without a main grid pattern structure designed for Example 1;
[0018] Figure 2 for Figure 1 A partial enlarged view of the A part;
[0019] Figure 3 for Figure 2 The local enlarged picture of the B part, that is Figure 3 It is equivalent to the enlarged schematic diagram of the bold section in Example 1;
[0020] Figure 4 This is a schematic diagram of the main grid graphic structure on the front of an existing solar Topcon cell.
[0021] Markings in the figure: 1-Topcon battery cell, 2-main grid line preset area, 3-secondary grid line, 4-bold segment, 5-welding contact point. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom" and the like indicate positions or positional relationships, which are 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 position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second" and the like are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein.
[0024] Example 1
[0025] like Figures 1 to 3 As shown, this embodiment 1 proposes a solar Topcon cell front side non-busbar pattern structure, which includes a Topcon cell sheet 1, and the Topcon cell sheet 1 has a first direction and a second direction perpendicular to each other;
[0026] like Figure 2 As shown, the front side of the Topcon cell sheet 1 has a plurality of columns of busbar preset areas 2 arranged in parallel along a first direction, and no busbar is printed in each column of the busbar preset area 2, and the busbar preset area 2 extends along a second direction;
[0027] A plurality of mutually parallel auxiliary grid lines 3 are printed along the second direction on the front side of the Topcon cell 1, and a plurality of gradually changing thickened segments 4 are printed along the length direction of each auxiliary grid line 3, and the thickened segments 4 are arranged in a symmetrical structure, which first gradually becomes thicker and then gradually becomes thinner. The thickened segments 4 are specifically a three-level gradually changing combined graphic structure, which is formed by a combination of a trapezoid + a rectangle + a trapezoid (such as Figure 3As shown), the thickened segment 4 is arranged in the main grid line preset area 2; the length of the thickened segment 4 is set to 0.6mm, the width of the thickest part of the thickened segment 4 is set to 0.09mm, and the width of the thinnest part is set to 0.013mm; rectangular structured welding contact points 5 are also respectively arranged at both ends of each main grid line preset area 2, and the welding contact points 5 are connected to the auxiliary grid lines 3, the width of the welding contact points 5 along the first direction is set to 0.8mm, and the length along the second direction is set to 1.2mm; the spacing between each column of main grid line preset areas 2 is set to 8.6mm.
[0028] like Figure 4 As shown, the existing solar Topcon cell front graphic structure has a main grid structure design, which will lead to high silver paste consumption and high cost.
[0029] The above preferred embodiments of the utility model are only used to explain the utility model, and are not used to limit the utility model. Any obvious changes or modifications derived from the technical solution of the utility model are still within the protection scope of the utility model.
Claims
1. A solar Topcon cell with no main grid pattern structure on the front, characterized in that: It comprises a Topcon battery cell (1), wherein the Topcon battery cell (1) has a first direction and a second direction that are perpendicular to each other; A plurality of columns of busbar preset areas (2) arranged in parallel along a first direction are provided on the front side of the Topcon battery sheet (1), and busbars are not printed in each column of the busbar preset areas (2); A plurality of mutually parallel secondary grid lines (3) are printed along a second direction on the front side of the Topcon cell sheet (1), and a plurality of gradually changing bold segments (4) are printed on each of the secondary grid lines (3), wherein the bold segments (4) are arranged in the primary grid line preset area (2); Welding contact points (5) are also provided at both ends of each main grid line preset area (2), and the welding contact points (5) are connected to the auxiliary grid lines (3).
2. A solar Topcon cell front side without main grid pattern structure according to claim 1, characterized in that: A plurality of thickened sections (4) are printed on the auxiliary grid lines (3) along their length direction, and the thickened sections (4) are arranged in a symmetrical structure, showing a structure that gradually becomes thicker and then gradually becomes thinner.
3. A solar Topcon cell front side without main grid pattern structure according to claim 2, characterized in that: The thickened section (4) is in a three-level gradient combination graphic structure, which is formed by a combination of trapezoid + rectangle + trapezoid.
4. A solar Topcon cell front side without main grid pattern structure according to claim 1, 2 or 3, characterized in that: The length of the thickened section (4) is set to 0.3-0.8 mm, the width of the thickest part of the thickened section (4) is set to 0.05-0.10 mm, and the width of the thinnest part is set to 0.01-0.02 mm.
5. The solar Topcon cell front side non-busbar pattern structure according to claim 1, characterized in that: The welding contact point (5) is arranged as a rectangular structure.
6. A solar Topcon cell front side without main grid pattern structure according to claim 5, characterized in that: The width of the welding contact point (5) along the first direction is set to 0.5-1.0 mm, and the length along the second direction is set to 1.0-1.5 mm.
7. A solar Topcon cell front side without main grid pattern structure according to claim 1, characterized in that: The spacing between the preset areas (2) of each column of main grid lines is set to 7.0-10.0 mm.