Production process of high-efficient multi-grid welding strip

Abstract

The invention discloses a production process of a high-efficient multi-grid welding strip. The process comprises the following steps: 1) paying off copper wires; 2) carrying out calender setting; 3) annealing; 4) soaking in soldering flux; 5) quickly tin-plating; 6) cooling; 7) taking up the wires. According to the production process, under a condition of guaranteeing the specification of a round wire welding strip, the round wire is made into an ellipse wire, so that the welding contact area of the round wire and an assembly battery cell is increased; moreover, under a condition of guaranteeing the welding performance of the round wire, the local overheat phenomenon of the assembly battery cell is improved.

Description

technical field [0001] The invention belongs to solar photovoltaic products, and in particular relates to a production process of multi-grid high-efficiency soldering strips. Background technique [0002] Photovoltaic soldering strips, also known as tinned copper strips or tinned copper strips, are divided into bus strips and interconnection strips, and are used for the connection of photovoltaic module cells. The width of the ribbon depends on the busbar width of the cell, and the thickness depends on the thickness of the cell and the amount of short-circuit current. With the development of multi-busbar technology, due to the large number of ribbons, the width of the ribbons is relatively high. The use of conventional ribbons has the following disadvantages: the ribbon width is large, and the shielding area is large when applied to components, resulting in The photoelectric conversion efficiency decreases and the current loss increases. [0003] In order to meet the devel...

AI Technical Summary

Problems solved by technology

With the development of multi-busbar technology, due to the large number of ribbons, the width of the ribbons is relatively high. The use of conventional ribbons has the following disadvantages: the ribbon width is large, and the shielding area is large when applied to components, resulting in The photoelectric conversion efficiency decreases and the current loss increases

[0003] In order to meet the development requirements of multi-busbar cells, the thin grid ribbons developed at this stage are mostly round wire ribbons. The advantages of this ribbon are: 1. Increase the output power by about 5%; 2. Save the cost of silver paste 20%; Disadvantages of this ribbon: 1. The contact area is small when soldered to the module cells, resulting in excessive resistance of the contact points; 2. During use, it is easy to cause local overheating of the module cells, and even cause the module cells to burn out. Affect the normal use of module cells

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