Preparation method of photovoltaic triangular welding strip

Abstract

The invention discloses a preparation method of a photovoltaic triangular welding strip. The preparation method comprises the steps of metal wire shaping and metal wire tinning. Metal wire shaping comprises the following steps that a metal wire with the circular cross section is subjected to calendaring by adopting a pair of rolling shafts, and the cross section of the metal wire is shaped into a triangle; the pair of rolling shafts comprises a first rolling shaft which is used as a bottom surface shaping support of the triangular section of the metal wire and a second rolling shaft which is used for guiding and plastically processing the metal wire; the first rolling shaft and the second rolling shaft are straight rolling shafts which are arranged in parallel; the surface of the first rolling shaft is smooth; and an annular groove is formed in the surface of the second rolling shaft, the annular groove and the second rolling shaft are coaxial, and the cross section of the annular groove is triangular. According to the preparation method of the photovoltaic triangular welding strip, the precision of the triangular section of the welding strip can be improved, the effective reflection area of the welding strip is improved, and then the generating capacity of an assembly is improved.

Description

technical field [0001] The invention relates to the field of photovoltaics, in particular to a preparation method of a triangular welding ribbon for photovoltaics. Background technique [0002] In the current module manufacturing process in the photovoltaic field, the mainstream technical solution is to use tinned metal wires (hereinafter referred to as solder ribbons) to connect the silver paste busbars printed on the positive and negative electrodes of the battery in series by welding, so that the All batteries form a stable series-parallel electrical performance structure within the module according to the design. In this process, the ribbon will inevitably cover a considerable part of the light-receiving area of ​​the cell. The position of the ribbon and the area covered by it vary according to the graphic design of the battery and the design of the component process. As a result, the battery is blocked by the ribbon. A part of the photogenerated current is lost. [00...

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Problems solved by technology

[0005] In addition, since the existing welding strip production process is tinning after shaping, as the wire diameter of the welding strip becomes thinner, the proportion of the thickness of the tin plating layer in the cross-section will also increase, while the tinning process , the surface tension of the liquid will make the surface of the wire more rounded by the liquid metal tin, which will further reduce the effective reflection area of ​​the ribbon

[0006] Moreover, in the process of processing thinner ribbons, the mechanical properties of the wire are gradually reduced, and the tensile capacity and elongation at break of the wire are simultaneously reduced. The processing method using a wire drawing die is more prone to wire breakage, etc.

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