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Electrode structure of high-efficiency solar cell suitable for step-by-step printing

A solar cell and electrode structure technology, which is applied to circuits, photovoltaic power generation, electrical components, etc., to achieve the effects of improving conversion efficiency, high fault tolerance, and good lap reliability

Pending Publication Date: 2020-04-03
GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an electrode structure suitable for step-by-step printing of high-efficiency solar cells, which can effectively avoid the problems of appearance and EL defects caused by the alignment offset of the existing step-by-step printing and the problem of parallel overprinting at overlapping joints. The problem of poor printing, and at the same time avoiding the welding problem of the component end caused by the poor lap of the main grid and the fine grid of the battery

Method used

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  • Electrode structure of high-efficiency solar cell suitable for step-by-step printing
  • Electrode structure of high-efficiency solar cell suitable for step-by-step printing
  • Electrode structure of high-efficiency solar cell suitable for step-by-step printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Use a battery with a size of 156.75*156.75mm;

[0063] On the front of the battery, the main grid 1 is first printed according to the main grid pattern. The main grid 1 includes the main grid line 11 in the welding area and the main grid overlapping structure 12. The width of the main grid line 11 in the welding area is 700 μm, and the main grid overlapping structure 12 It is an isosceles triangle, the side length of the triangle is 713.5μm, and the apex angle is 60°. The paste for printing the busbar is non-burn-through silver paste, and the screen is a 325-mesh screen printing screen;

[0064] Then print the fine grid 3 according to the fine grid pattern, the fine grid 3 includes a fine grid line 31 and a fine grid overlapping structure 32 connecting two adjacent fine grid lines 31, the width of the fine grid line 31 is 30 μm, and the fine grid line The overlapping structure 32 is V-shaped, the line width of the overlapping structure of the fine grid is 100 μm, and th...

Embodiment 2

[0067] Use a battery with a size of 158.75*158.75mm;

[0068] On the front of the battery, the main grid 1 is first printed according to the main grid pattern. The main grid 1 includes the main grid line 11 in the welding area and the main grid overlapping structure 12. The width of the main grid line 11 in the welding area is 700 μm, and the main grid overlapping structure 12 It is an isosceles triangle, the side length of the triangle is 722.7μm, and the apex angle is 60°. The paste for printing the busbar is non-burn-through silver paste, and the screen is a 325-mesh screen printing screen;

[0069] Then print the fine grid 3 according to the fine grid pattern, the fine grid 3 includes a fine grid line 31 and a fine grid overlapping structure 32 connecting two adjacent fine grid lines 31, the width of the fine grid line 31 is 30 μm, and the fine grid line The overlapping structure 32 is groove-shaped, the length of the top side is 481.8 μm, the angle between the top side an...

Embodiment 3

[0072] Use a battery with a size of 161.7*161.7mm;

[0073] On the front side of the battery, the fine grid 3 is first printed according to the fine grid pattern, and the fine grid 3 includes a fine grid line 31 and a fine grid overlapping structure 32 connecting two adjacent fine grid lines 31, and the width of the fine grid line 31 is 30 μm, the fine grid overlapping structure 32 is V-shaped, the line width of the fine grid overlapping structure is 100 μm, and the paste for printing the fine grid is a burn-through silver paste;

[0074] Then print the busbar 1 according to the busbar pattern, the busbar 1 includes the busbar 11 in the welding area and the busbar overlapping structure 12, the width of the busbar 11 in the welding area is 700 μm, and the busbar overlapping structure 12 is isosceles trapezoidal , the length of the base of the isosceles trapezoid is 736.2 μm, and the angle between the base and the waist is 60°. The paste for printing the busbar is a non-burn-thr...

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Abstract

The invention discloses an electrode structure of a high-efficiency solar cell suitable for step-by-step printing. The structure comprises main grids and fine grids which are connected with each other, wherein each main grid comprises a welding area main grid line and a main grid lap joint structure; each fine grid comprises a fine grid line and a fine grid lap joint structure for connecting everytwo adjacent fine grid lines; the distance between every two adjacent main grids is the distance between the main grid lap joint structures, the distance between the main grid lap joint structures ismatched with the length of the thin grid lines, the main grid lap joint structures and the thin grid lap joint structures are intersected and overprinted, and at least two intersected and overprintedintersection points are formed on the two sides of each main grid and the two sides of each thin grid line respectively. By adopting the method, the problems of poor appearance and EL caused by step-by-step printing alignment offset and poor printing caused by parallel overprinting at the lap joint position are effectively avoided, and the problem of assembly end welding caused by poor lap jointof the main grids and the fine grids of the battery is avoided.

Description

technical field [0001] The invention relates to the manufacturing field of solar cells, in particular to an electrode structure suitable for step-by-step printing of high-efficiency solar cells. Background technique [0002] In recent years, the mainstream products of solar cells have transitioned from traditional cells to high-efficiency PERC cells. As the conversion efficiency of cell products tends to become a bottleneck and the production process continues to mature, solar cells are facing huge challenges in reducing costs and increasing efficiency. [0003] Among the non-silicon costs of solar cell production, the cost of silver paste dominates. There are three main printing methods for current electrodes: (1) single screen printing technology; (2) double printing technology: first print the fine grid, and then print the main fine grid together again. (3) Step-by-step printing technology: the main grid and the fine grid are printed separately. [0004] Such as figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/05H01L31/0224
CPCH01L31/0508H01L31/022425Y02E10/50
Inventor 杨苏平黄石明尧海华吴波林纲正陈刚
Owner GUANGDONG AIKO SOLAR ENERGY TECH CO LTD
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