Preparation method for spotlight tin-coated copper band

Abstract

The invention relates to a preparation method for a spotlight tin-coated copper band. The preparation method includes adopting a soft copper wire with an elongation rate of 5% - 30% to roll into a flat copper baseband through a dog of a calender; drawing the flat copper baseband into a rectangular copper baseband by utilizing a rectangular die; passing the copper baseband through a trapezoidal drawing die, and obtaining fluidity to fill the shape consistent with the die hole patterns through drawing and extrusion in a molding part in the trapezoidal drawing die so that a trapezoidal copper-based structure can be prepared, wherein the profile of a cross section is in a trapezoidal shape, the trapezoidal copper-based structure has a face I and a face II in a length direction, and reflectivesurface structures formed by triangular peaks and inverted trapezoidal grooves in an interlaced circulation manner are separately arranged on the face I and the face II; and preparing a spotlight tin-coated copper strip through a tin plating method after the heat treatment of the trapezoidal copper-based structure, and forming a tin solder coating in segmented interlaced circulation and with different thicknesses on a surface. A prepared copper base and the spotlight tin-coated copper band prepared by utilizing the copper base have double-sided pattern reflective structures, so that the maximized secondary reflection of the light entering a photovoltaic module onto the surface of a solar photovoltaic cell can be realized.

Description

technical field [0001] The invention relates to a preparation method of a light-condensing tin-coated copper strip. Background technique [0002] At present, in today's increasingly fierce homogenization competition in the photovoltaic industry, technological innovation and process optimization are used to increase module power and reduce production costs. On this basis, further accelerate the promotion of photovoltaic energy and thermal power generation. It is the only way to survive before every PV person. Photovoltaic tin-coated copper strip industry has evolved following the changes in battery technology and module technology. The problem of shading tin-coated copper strips on batteries has not been effectively solved. If the width of tin-coated copper strips is further reduced, the shading area can be reduced , but the series resistance of the module will increase, and eventually the power will be lost. , hidden cracks and other defects will remain high. [0003] In ...

AI Technical Summary

Problems solved by technology

Photovoltaic tin-coated copper strip industry has evolved following the changes in battery technology and module technology. The problem of shading tin-coated copper strips on batteries has not been effectively solved. If the width of tin-coated copper strips is further reduced, the shading area can be reduced , but the series resistance of the module will increase, and eventually the power will be lost. , hidden cracks and other defects will remain high

[0006] The shape of the product shape and structure in the prior art is all rectangular, and the reflective structure is only set on one side of the product. This shape structure cannot effectively maximize the utilization of the light entering the battery, and the welding surface is due to the surface of the copper base strip. It is a smooth surface. After tinning by hot-dip plating process, the surface is actually a circular arc surface. Uneven coating can easily lead to false welding, especially after lamination, there is no gap between the tin-coated copper strip and the cell to release residual stress It leads to an increase in the fragmentation rate. Due to the high cost of the complex process and equipment, the copper powder produced by the roll process seriously affects the accuracy of the pattern and leads to the failure of the reflective structure. Therefore, it is not suitable for the widespread application of this technology in the industry.

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