Crystalline silicon solar Metal Wrap Through (MWT) battery and manufacturing method thereof
A production method and solar energy technology, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as hidden cracks, fragments, and increased defective products, and achieve the effects of easy interconnection, reduced equipment investment, and accelerated industrialization
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[0033] Example 1: Such as figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 As shown,
[0034] A method for manufacturing a crystalline silicon solar MWT cell includes the following steps: firstly, perform eight-shaped distributed laser drilling on the bare silicon wafer, and then conduct the cell process: texturing, diffusion, PSG removal, PECVD, screen printing, sintering, Laser isolation. The screen printing steps are: ①Print the back positive electrode (1) and the back negative electrode (2) at the same time; ②Print the back electric field (3); ③Print the front grid line (4) and the front hole-filling grid line (5) at the same time.
[0035] 1. The biggest feature of the punched pattern is the figure eight, such as figure 2 As shown, about 10 holes in the middle group A are distributed vertically downward from the center of the silicon wafer, and about 25 holes in the group C and B are in a figure eight. An average of 3-4 grid lines is perforated with a hole diameter o...
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[0042] Example 2:
[0043] A crystalline silicon solar MWT cell and a manufacturing method thereof. The MWT cell realizes the conduction of the upper and lower perforated electrodes through a unique eight-shaped distributed perforation method. The cell process is as follows: after the holes are punched on the bare chip, texturing, Diffusion, PSG, PECVD, screen printing, sintering, laser isolation. The screen printing steps are: ①Print the back positive electrode (1) and the back negative electrode (2) at the same time; ②Print the back electric field (3); ③Print the front grid line (4) and the front hole-filling grid line (5) at the same time. The interconnection of the battery slices is all realized on the back. The traditional welding process is used to weld the back negative electrode (or back negative electrode) of battery slice 1 to the back negative electrode (or back negative electrode) of battery slice 2 in series to achieve the The high compatibility of traditional compo...
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