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Manufacture method of tinned copper tape for solar cells

A technology for solar cells and tin-plated copper strips, applied in liquid cleaning methods, cleaning methods and utensils, chemical instruments and methods, etc., can solve problems such as uneven appearance, easy peeling off of plating, uneven thickness, etc.

Inactive Publication Date: 2013-03-27
RISEN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the tinned copper strip that prior art method produces is because copper strip surface pollutant and oxide layer are not removed clean before tinning, and surface oxidation is serious, and outward appearance is uneven, and thickness is uneven (as figure 1 As shown), the electrical conductivity is poor when used after tinning, and the coating is prone to fall off; at the same time, after tinning, not only the color of the tinned copper strip is easy to change, but also the surface of the tinned copper strip is prone to piles of tin or cracks and other serious problems Conditions that affect electrical performance (such as Figure 4 shown)

Method used

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  • Manufacture method of tinned copper tape for solar cells
  • Manufacture method of tinned copper tape for solar cells
  • Manufacture method of tinned copper tape for solar cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method for a tinned copper strip for a solar cell, comprising the following steps:

[0022] 1) The oxygen-free copper wire is finished rolled and subjected to continuous tubular annealing, the annealing temperature is 450~520°C, the speed is 2 m / min, and nitrogen is used as the protective gas during the annealing process;

[0023] 2) Use HCl solution (HCl is the molecular formula of hydrogen chloride, chloric acid, commonly known as hydrochloric acid) to ultrasonically clean the oxygen-free copper wire. The ultrasonic temperature is 30~40°C, the frequency is 20~40KHz, and the speed is 1 m / min. The percentage by weight of HCl in the above-mentioned HCl solution is 6%; The copper strip surface after treatment is as follows figure 2 shown;

[0024] 3) The cleaned copper strip is wetted with flux, and enters the tin furnace to coat tin alloy;

[0025] 4) After the tin-coated alloy copper strip comes out of the tin furnace, it first passes through t...

Embodiment 2

[0029] A preparation method for a tinned copper strip for a solar cell, comprising the following steps:

[0030] 1) The oxygen-free copper wire is finished rolled and subjected to continuous tubular annealing, the annealing temperature is 450~520°C, the speed is 2 m / min, and nitrogen is used as the protective gas during the annealing process;

[0031] 2) Ultrasonic cleaning of the oxygen-free copper wire with HCl solution, the ultrasonic temperature is 30-40°C, the frequency is 20-40KHz, and the speed is 2 m / min. The weight percentage of HCl in the HCl solution is 5%; the treated Copper strip surface such as figure 2 shown;

[0032] 3) The cleaned copper strip is wetted with flux, and enters the tin furnace to coat tin alloy;

[0033] 4) After the tin-coated alloy copper strip comes out of the tin furnace, it first passes through the air inlet of the automatic speed-adjusting induced draft fan, and the induced draft fan uses nitrogen gas; the treated coating surfac...

Embodiment 3

[0037] A preparation method for a tinned copper strip for a solar cell, comprising the following steps:

[0038] 1) The oxygen-free copper wire is finished rolled and subjected to continuous tubular annealing, the annealing temperature is 450~520°C, the speed is 2 m / min, and nitrogen is used as the protective gas during the annealing process;

[0039] 2) Ultrasonic cleaning of the oxygen-free copper wire with HCl solution, the ultrasonic temperature is 30-40°C, the frequency is 20-40KHz, and the speed is 3 m / min. The weight percentage of HCl in the HCl solution is 4%; the treated Copper strip surface such as figure 2 shown;

[0040] 3) The cleaned copper strip is wetted with flux, and enters the tin furnace to coat tin alloy;

[0041] 4) After the tin-coated alloy copper strip comes out of the tin furnace, it first passes through the air inlet of the automatic speed-adjusting induced draft fan, and the induced draft fan uses nitrogen gas; the treated coating surfac...

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Abstract

A manufacture method of a tinned copper tape for solar cells includes the steps: 1) pre-treating an anaerobic copper tape; 2) performing ultrasonic cleaning for the anaerobic copper tape by HCl (hydrogen chloride) solution; 3) soaking a cleaned copper tape in soldering flux, and then feeding the cleaned copper tape into a tin furnace for tin alloy coating; 4) after the copper tape coated with tin alloy is discharged from the tin furnace, enabling the copper tape coated with the tin alloy to pass an induced draft port of an automatic speed regulation induced draft fan which adopts nitrogen; and 5) coiling via an automatic leading and taking machine and an automatic wire winding machine and packaging so that a solder strip finished product is formed. Compared with the prior art, the method has the advantages that contaminants on the surface of the copper tape can be removed completely to enable the surface of the copper tape to be uniform and glossy (as shown in figure 2); and binding force of the uniform and glossy copper tape surface and the tin alloy is better to enable a coating to be uniform in thickness, dense and less prone to shedding, the surface of the coating is less prone to oxidation as the induced draft fan adopts nitrogen, internal stress of the coating is small (as shown in figure 4) as surface structure is single, and accordingly electrical conductivity is fine.

Description

technical field [0001] The invention belongs to the field of solar equipment component manufacturing, in particular to a preparation method of a tinned copper strip for a solar cell. Background technique [0002] Photovoltaic ribbon, also known as tinned copper strip or tinned copper strip, is divided into bus strips and interconnection strips, which are used for the connection between photovoltaic module cells and are one of the key components of solar cells. [0003] In the prior art, after the copper strip is annealed and coated with flux, the copper strip coated with flux is immersed in a high-temperature liquid tin furnace through a guide wheel, and physically combined with tin under the action of flux, and tin naturally adheres to the surface of the copper strip , For example, the application number is: 200910181579.5, the name is: a patent application for a manufacturing method of ultra-soft photovoltaic ribbon, the application number is: 201010589377, and the name is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18B08B3/12
CPCY02P70/521Y02P70/50
Inventor 林海峰曾学仁王宗军
Owner RISEN ENERGY