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Low-melting point welding strip special for welding ultrathin photovoltaic cells and preparation method of low-melting point welding strip

A photovoltaic cell and low melting point technology, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problems of low thermal expansion coefficient, low welding temperature, low melting point, etc., achieve small deformation, easy operation, The effect of lowering the soldering temperature

Inactive Publication Date: 2018-06-15
WUXI SVECK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the material cost of photovoltaic modules, the thickness of photovoltaic cells will continue to decrease (thickness is 120-170um). If conventional photovoltaic ribbons are used, after heating at 200°C, the tensile stress between photovoltaic cells and ribbons will decrease. Exceeding the tolerance of photovoltaic cells, resulting in cracks or even ruptures, therefore, it is necessary to design a photovoltaic ribbon that meets the requirements of ultra-thin photovoltaic cells. This photovoltaic ribbon needs to have a lower melting point and a lower Soldering temperature and low thermal expansion coefficient, and need to have good electrical conductivity and soldering performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] S1: The alloy composition is prepared by melting various metal components together according to the following mass percentages:

[0021] Tin: 41-45%;

[0022] Lead: 41-45%;

[0023] Bismuth: 12-16%;

[0024] Silver: 0-2%;

[0025] Copper: 0-1%;

[0026] S2: put the alloy obtained in step S1 into a tin furnace, and keep the temperature in the tin furnace at 183°C-193°C;

[0027] S3: Roll the copper wire into a copper strip and then anneal it, and keep the traveling speed of the copper strip at 100-120m / min;

[0028] S4: Tin coating by hot dip method, the copper strip passes through the flux, and then passes through the tin furnace, combined with the alloy, and the tin coating on the front and back of the copper strip is controlled by the air knife;

[0029] S5: Use a fan to cool the front and back of the tin ribbon, wind the cooled tin ribbon into a roll, and vacuum pack it.

[0030] The welding temperature of the low melting point photovoltaic ribbon obtained in t...

Embodiment 2

[0032] S1: The alloy composition is prepared by melting various metal components together according to the following mass percentages:

[0033] Tin: 40-44%;

[0034] Bismuth: 55-59%;

[0035] Silver: 0-2%;

[0036] Copper: 0-1%;

[0037] S2: put the alloy obtained in step S1 into a tin furnace, and keep the temperature in the tin furnace at 159°C-169°C;

[0038] S3: Roll the copper wire into a copper strip and then anneal it, and keep the traveling speed of the copper strip at 100-120m / min;

[0039] S4: Tin coating by hot dip method, the copper strip passes through the flux, and then passes through the tin furnace, combined with the alloy, and the tin coating on the front and back of the copper strip is controlled by the air knife;

[0040] S5: Use a fan to cool the front and back of the tin ribbon, wind the cooled tin ribbon into a roll, and vacuum pack it.

[0041] The welding temperature of the low melting point photovoltaic ribbon obtained in this embodiment is 149°C-...

Embodiment 3

[0043] S1: The alloy composition is prepared by melting various metal components together according to the following mass percentages:

[0044] Tin Sn: 44-48%;

[0045] Lead Pb: 44-48%;

[0046] Bismuth Bi: 6-10%;

[0047] Silver Ag: 0-2%;

[0048] Copper: 0-1%;

[0049] S2: put the alloy obtained in step S1 into a tin furnace, and keep the temperature in the tin furnace at 187°C-197°C;

[0050] S3: Roll the copper wire into a copper strip and then anneal it, and keep the traveling speed of the copper strip at 100-120m / min;

[0051] S4: Tin coating by hot dip method, the copper strip passes through the flux, and then passes through the tin furnace, combined with the alloy, and the tin coating on the front and back of the copper strip is controlled by the air knife;

[0052] S5: Use a fan to cool the front and back of the tin ribbon, wind the cooled tin ribbon into a roll, and vacuum pack it.

[0053] The temperature of the low-melting-point photovoltaic ribbon obtained i...

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PUM

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Abstract

The invention belongs to the technical field of photovoltaic new energy, and particularly relates to a low-melting point welding strip special for welding ultrathin photovoltaic cells and a preparation method of the low-melting point welding strip. The welding strip comprises three, four or five compositions of tin, lead, bismuth, silver and copper. The preparation method of the welding strip comprises the following steps of S1, weighing three, four or five metals of the tin, the lead, the bismuth, the silver and the copper, preparing alloy components by putting them together and melting; S2,placing the alloy obtained in the step S1 into a tin furnace; S3, rolling the copper wires into copper strips for annealing; S4, coating the tin by adopting a hot dipping method; and S5, cooling the front and back surfaces of the tin strip by using a fan. The invention has the beneficial effects that a welding temperature of the welding strip is greatly reduced, a deformation of the photovoltaic cells is small after the welding strip is welded with the ultrathin photovoltaic cells, the stress is smaller than bearing capacity of the photovoltaic cells, so that a hidden crack and a fragment rateof the ultrathin photovoltaic cells can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of photovoltaic new energy, in particular to a low-melting-point welding ribbon specially used for welding ultra-thin photovoltaic cells and a preparation method thereof. Background technique [0002] Solar photovoltaic cells are a very promising new power source, which has the three advantages of permanence, cleanliness and flexibility; however, the cost of solar photovoltaic power generation is still much higher than that of conventional water conservancy and thermal power generation, so reducing the cost of photovoltaic cells Component production cost has become the top priority of every enterprise. In photovoltaic cell modules, the cost of raw material photovoltaic cells accounts for more than 80% of the production cost of the entire module. The thickness of conventional photovoltaic cells is usually 180±5um, and the photovoltaic ribbon used is usually a binary alloy based on tin-lead alloy. Solder, the...

Claims

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Application Information

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IPC IPC(8): B23K35/26B23K35/40
Inventor 程中广
Owner WUXI SVECK TECH