Welding strip used in low-temperature welding mode and used for solar photovoltaic module

A solar photovoltaic and low-temperature welding technology, applied in the field of low-temperature welding ribbons, can solve problems such as huge costs, and achieve the effects of reducing breakage, reducing warpage, and ensuring welding reliability.

Inactive Publication Date: 2013-07-10
袁奇英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Under the above-mentioned background, some conductive adhesive films or conductive tapes have become one of the research directions (patent documents 2-4), but these adhesive films / tapes, because their application will greatly change the equipment of existing component manufacturers, and face huge cost

Method used

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  • Welding strip used in low-temperature welding mode and used for solar photovoltaic module
  • Welding strip used in low-temperature welding mode and used for solar photovoltaic module
  • Welding strip used in low-temperature welding mode and used for solar photovoltaic module

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The commercially available solar tinned solder strip is hot-dipped with an alloy Bi58-Sn42 (ie Bi58wt%, Sn42wt%), and the thickness of the alloy coating is 20um. In order to detect the feasibility and applicability of the present invention, the solar cell sheet was prepared by the welding ribbon at a welding temperature of 200°C (the welding temperature of the common welding ribbon is 350°C), as image 3 shown. The solar cell adopts the commonly used backplane-EVA-cell-EVA-glass structure. A total of 6 solder ribbons are used for solar cells, 3 on the front and 3 on the back. In order to facilitate the subsequent test of contact resistance, the welding rods are numbered from left to right as 1, 2, and 3. The test data is shown in Table 1, which is close to that of ordinary welding strips. It can be seen that the welding strips have excellent performance.

[0054] Table 1

[0055]

Embodiment 2

[0057]On a pure copper foil with a thickness of 0.1mm, Bi58-Sn42 (its melting point is 138.5°C) is electroplated, and the thickness of the alloy coating is 20um. All the other are with embodiment 1.

Embodiment 3

[0059] On a galvanized copper foil with a thickness of 0.1mm, hot-dip plating of Bi60-Cd40 (its melting point is 144°C). All the other are with embodiment 1.

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Abstract

The invention relates to a welding strip used in a low-temperature welding mode and used for a solar photovoltaic module. The welding strip structurally comprises a high-conductivity base material and a low-melting-point alloy layer which is arranged on at least one of surfaces of the base material, and the melting point of the low-melting-point alloy layer is 70-230 DEG C. Compared with the prior art, the welding strip not only guarantees welding reliability in a welding process, but also reduces the situation that due to a high-temperature welding mode, battery slices of a solar cell are broken.

Description

technical field [0001] The invention relates to a welding ribbon, in particular to a low-temperature welding ribbon used for solar photovoltaic modules. Background technique [0002] As a solution to the serious global warming and depletion of fossil energy, solar energy is attracting attention as a clean and renewable energy. Currently, mainstream solar cells have a structure in which solar cells having single crystal or polycrystalline Si wafers are connected in series or in parallel via electrodes and metal wiring members. [0003] In general, connection between electrodes of solar cells and metal wiring members has been performed using inexpensive solder that exhibits good electrical conductivity (Patent Document 1). When connecting, it needs to be heated above the melting temperature of the solder to connect the electrodes of the solar cell unit to the wiring member, but the general solder melting point is above 230-260°C, and the actual soldering temperature is much h...

Claims

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Application Information

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IPC IPC(8): H01L31/05
CPCY02E10/50
Inventor 袁奇英
Owner 袁奇英
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