Special-shaped tin-coated copper strip and preparation method thereof

Abstract

The invention relates to a special-shaped tin-coated copper strip and a preparation method. A special-shaped structure with a plurality of circulating units is continuously, alternately and circularlyarranged in the length direction. The special-shaped tin-coated copper strip unit of each circulation unit comprises a first section, a second section in transition connection with the first sectionand a third section in transition connection with the second section, wherein the cross section of the first section and the cross section of the third section are embossed flat, circular, D-shaped semicircular, trapezoidal or triangular, and the cross section of the second section is flat rectangular. The soft copper wire is extruded and rolled into a flat copper base band through a rolling headrolling mechanism; a knurling roller is extruded up and down to form a patterned copper strip which is provided with a continuous trapezoidal tooth-shaped reflective surface and a welding surface in the length direction in the width direction; the special-shaped copper strip is formed by a first section, a second section and a third section, forms a single circulating unit and is continuously, alternately and circularly arranged in the length direction, and tin solder is coated on the special-shaped copper strip; and the width of the section welded on the front surface of the cell is narrow, so the light receiving area of the front surface of the cell is increased.

Description

technical field [0001] The invention relates to a special-shaped tin-coated copper strip and a preparation method thereof. Background technique [0002] At present, the shading problem of the photovoltaic tin-coated copper strip on the battery has been difficult to effectively solve. If the width of the tin-coated copper strip 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. , if the width of the tin-coated copper strip is reduced and the thickness is increased, although the internal resistance of the battery is improved, the defect rate such as fragmentation rate, exposed white, hidden cracks and TC reliability during the assembly process will remain high, affecting normal use of the production line. [0003] In the prior art, the products used to improve the shading problem include segmented reflective ribbons and triangular ribbons combined with ordinary flat ribbons (higher...

AI Technical Summary

Problems solved by technology

[0002] At present, the shading problem of the photovoltaic tin-coated copper strip on the battery has been difficult to effectively solve. If the width of the tin-coated copper strip 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. , if the width of the tin-coated copper strip is reduced and the thickness is increased, although the internal resistance of the battery is improved, the defect rate such as fragmentation rate, exposed white, hidden cracks and TC reliability during the assembly process will remain high, affecting Normal use of the production line

[0005] Reflective film and ordinary reflective ribbon, because the thickness of the overlapped part of the battery is too thick when making stacked components for series welding, it will greatly increase the rate of hidden cracks and fragments of the battery, so it can no longer meet the design of stack welding of half-chip and high-density components. need

[0006] Due to the height of the triangular section of the pure triangular ribbon, the component design needs to be equipped with higher weight EVA or POE materials, which increases the component manufacturing cost

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