Etching groove for improving appearance yield of double-sided PERC battery and reducing acid consumption

A technology for etching grooves and batteries, which is applied to circuits, photovoltaic power generation, electrical components, etc., can solve problems such as poor appearance, and achieve the effects of solving abnormal appearance on the back, low acid concentration, and reducing acid consumption

Pending Publication Date: 2019-07-05
TONGWEI SOLAR ENERGY CHENGDU CO LID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an etching tank that improves the appearance yield of double-sided PERC batteries and reduces acid consumption in order to improve the appearance of poor appearance caused by etching, improve product appearance yield, and reduce acid consumption.

Method used

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  • Etching groove for improving appearance yield of double-sided PERC battery and reducing acid consumption
  • Etching groove for improving appearance yield of double-sided PERC battery and reducing acid consumption
  • Etching groove for improving appearance yield of double-sided PERC battery and reducing acid consumption

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Embodiment 1

[0023] An etching tank for improving the appearance yield of a double-sided PERC battery and reducing acid consumption provided by a preferred embodiment of the present invention includes an etching tank main body, and an etching solution 3 is provided in the etching tank main body. The main body of the etching tank is built with several rollers 2 for driving the etching solution 3. The etching solution 3 does not completely submerge the rollers 2. The rollers 2 are provided with threads, and the thread depth of the threads ranges from 0.2 mm to 2 mm. , the thread pitch of the thread ranges from 0.2 mm to 3 mm.

[0024] The working principle of this embodiment: when the program is working, the motor provides power to drive the roller 2 to rotate. The thread depth of the thread provided on the roller 2 ranges from 0.2mm to 2mm, and the thread pitch of the thread ranges from 0.2mm to 3mm. The rotation of the roller brings acid and capillary action, and the silicon chip 4 is basi...

Embodiment 2

[0027] The preferred embodiment of the present invention makes the following optimizations on the basis of the first embodiment, the height of the exposed part of the roller 2 above the liquid level of the etching solution 3 ranges from 0.1 mm to 3 mm.

Embodiment 3

[0029] The preferred embodiment of the present invention makes the following optimizations on the basis of the first embodiment, the distance between the two adjacent rollers 2 ranges from 10m to 100mm.

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Abstract

The invention discloses an etching groove for improving appearance yield of a double-sided PERC battery and reducing acid consumption, and relates to the technical field of crystalline silicon solar cell production equipment. The etching groove comprises an etching groove main body, wherein an etching liquid is arranged in the etching groove main body; a plurality of rolling wheels used for driving the etching liquid are arranged in the etching groove main body; the rolling wheels are not completely immersed in the etching liquid; and threads are arranged on the rolling wheels, wherein the thread depth range of the threads ranges from 0.2mm to 2 mm, and the thread pitch range of the threads ranges from 0.2mm to 3 mm. The problem of abnormal appearance of the back surface caused by bright edges is solved, the product appearance yield is improved, and meanwhile, the acid consumption can be reduced.

Description

technical field [0001] The invention belongs to the technical field of crystalline silicon solar cell production equipment, and in particular relates to an etching tank for improving the appearance yield of double-sided PERC cells and reducing acid consumption. Background technique [0002] The commonly used PERC battery manufacturing process is: texturing-phosphorus diffusion-back etching-annealing-Al2O3 coating-back SiNx coating-front SiNx coating-back laser slotting-screen printing-sintering, this process is slightly adjusted , including slightly reducing the amount of etching on the back side, reducing the thickness of the SiNx film on the back side, and changing the aluminum paste printing on the back side of the all-aluminum back field to the aluminum grid line printing at the position of the laser groove, so that the single-sided PERC battery can be upgraded to a double-sided PERC battery. [0003] Compared with single-sided PERC cells, the back of double-sided PERC c...

Claims

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Application Information

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IPC IPC(8): H01L21/67H01L31/18
CPCH01L21/67086H01L31/1804Y02E10/547Y02P70/50
Inventor 张元秋
Owner TONGWEI SOLAR ENERGY CHENGDU CO LID
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