Method for manufacturing MWT (Metal Wrap Through) battery by adopting screen overprinting technology

A stencil and battery technology, applied in the field of solar cells, can solve the problems of increased unit consumption of conductive paste, expensive conductive paste and high cost

Inactive Publication Date: 2013-03-06
EOPLLY NEW ENERGY TECH
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this way, the unit consumption of conductive paste will increase significantly, and the price of conductive paste is generally more expensive and the cost is high.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The specific steps of using the method of the present invention to produce a battery are: 1. First, the silicon wafer is processed by the following steps: laser through-hole, silicon wafer surface layer removal, texturing, phosphorus diffusion, etching edge removal, back junction removal, deposition reduction 2. Next, on the backlight side of the silicon wafer, a small opening screen is used, and the dot-shaped electrode pattern is used. The diameter of the electrode is 1 mm. Print once at the through hole; 3. The conductive paste forms a dot-shaped electrode on the surface of the silicon wafer, and at the same time realizes the slurry filling; 4. The silicon wafer directly enters the next printing without drying, using a large opening screen, 3 mm diameter point electrode mesh plate, and similar operations are performed again to form through-hole electrodes; 5. Next, the back electrode, the back electric field, the front grid line are printed, and finally sintered and m...

Embodiment 2

[0015] The specific steps of using the method of the present invention to produce a battery are: 1. First, the following steps are used for the silicon wafer: laser through hole, silicon wafer surface layer removal, texturing, phosphorus diffusion, etching edge removal, back junction removal, deposition of anti-reflection film 2. Next, on the backlight surface of the silicon wafer, a small opening screen is used, and the electrode pattern is dotted. The diameter of the electrode is 1 mm. According to the needs of the MWT battery, it is arranged into 4×4, and the position of the screen is adjusted. The hole is printed once; 3. The conductive paste forms a dot-shaped electrode on the surface of the silicon wafer, and at the same time fills the hole with the paste; 4. The silicon wafer directly enters the next printing without drying, using a large opening screen, size 3 8 mm strip electrode mesh plate, and similar operations are performed again to form through-hole electrodes; 5....

Embodiment 3

[0017] The specific steps of using the method of the present invention to produce a battery are: 1. First, the following steps are used for the silicon wafer: laser through hole, silicon wafer surface layer removal, texturing, phosphorus diffusion, etching edge removal, back junction removal, deposition of anti-reflection film 2. Next, on the backlight surface of the silicon wafer, a large opening screen is used, and the electrode pattern is dotted. The diameter of the electrode is 3 mm. According to the needs of the MWT battery, it is arranged in 5 × 5, and the position of the screen is adjusted. The hole is printed once; 3. The conductive paste forms a dot-shaped electrode on the surface of the silicon wafer, and at the same time fills the hole with the paste; Millimeter dot electrode mesh plate, and similar operations are performed again to form through-hole electrodes; 5. Next, the back electrode, the back electric field, the front grid line are printed, and finally sintere...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for manufacturing an MWT (Metal Wrap Through) battery by adopting a screen overprinting technology, which relates to the technical field of a solar battery. The method comprises the following operation steps of firstly, treating a silicon wafer by adopting the following steps of laser-perforating, removing a surface layer of the silicon wafer, making a sueding surface, diffusing phosphorus, etching and trimming, removing a back junction and depositing an anti-reflection film; printing the position needing to be printed by using a screen in one opening size for once; then, detecting the through-hole situation; and finally, printing for once or multiple times by adopting a screen in another opening size until the hole filling dense situation reaches to a technical requirement. The method disclosed by the invention is realized by adopting an overprinting method of a big-hole screen and a small-hole screen, and the method disclosed by the invention has the advantages that 1, multi-time printing can be realized, and the unit consumption of expensive sizing agent is not increased too much; 2, the position needing to be printed can be printed densely, and the requirement of the MWT battery can be met; and 3, a printing screen is provided with one big opening and a small opening or is provided one big opening and multiple small openings, thus the overall dimension of an electrode is not obviously changed, and the requirement of precise screen print can be met.

Description

Technical field: [0001] The present invention relates to the technical field of solar cells, in particular to a preparation method of an electrode for an MWT solar cell. Background technique: [0002] At this stage, the shading ratio of the busbars of conventional batteries is about 3%. If the busbars are transferred to the back side, the gridlines on the light-receiving surface without the busbars will be reduced accordingly. Further, if this area is utilized efficiently, the conversion efficiency of solar cells will be greatly improved. It is estimated that the absolute value of the conversion efficiency of solar cells without busbars on the light-receiving surface is expected to increase by 0.5%. Combined with other technologies such as backplane technology, it is possible to increase the absolute value of the conversion efficiency by 1%. [0003] The solar cell in which the busbar on the front side of the battery is drawn out through the through hole of the battery on ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): H01L31/18H01L31/0224B41M1/12
CPCY02P70/50
Inventor夏建汗
OwnerEOPLLY NEW ENERGY TECH