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 document

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
Comparison scheme
Effect test

Example Embodiment

[0052] Example 1

[0053] On the commercially available solar tinned solder tape, alloy Bi58-Sn42 (ie, Bi58wt%, Sn42wt%) is hot-dipped, and the thickness of the alloy coating is 20um. In order to test the feasibility and applicability of the present invention, the solar cells were prepared by using the solder ribbon at a welding temperature of 200°C (ordinary ribbon soldering temperature is 350°C), such as image 3 shown. The solar cell adopts the commonly used structure of backsheet-EVA-cell-EVA-glass. A total of 6 ribbons are used for solar cells, 3 on the front and 3 on the back. In order to facilitate the subsequent testing of contact resistance, the electrodes 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, showing that the welding strips have excellent performance.

[0054] Table 1

[0055]

Example Embodiment

[0056] Example 2

[0057]On the pure copper foil with a thickness of 0.1mm, electroplating Bi58-Sn42 (its melting point is 138.5 ℃), and the thickness of the alloy plating layer is 20um. The rest are the same as in Example 1.

Example Embodiment

[0058] Example 3

[0059] On a galvanized copper foil with a thickness of 0.1 mm, Bi60-Cd40 (the melting point of which is 144° C.) was hot-dip plated. The rest are the same as in Example 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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