Welding method for solar cells and interconnectors

Abstract

The invention discloses a welding method for solar cells and interconnectors, which is firm in welding and has no cold solder joints. Firstly spraying scaling powder on a main grid line of a cell and the front faces and rear faces of interconnectors, and then welding the interconnectors on the main grid line of the cell through an automatic welding machine. The welding method for the solar cells and the interconnectors has the advantages of enabling the scaling powder to be simultaneously sprayed on the cell and the interconnectors, well solving the contacting problem between the cell and the interconnectors, and enabling power loss of the cell to be reduced. Moreover, requirements of the automatic welding machine on interconnector performance and cell main grid line size can be lowered, Welding tension can be increased, and accordingly zero cold solder joints can be achieved. The welding method for the solar cells and interconnectors aims at increasing use ratio of the cells.

Description

technical field [0001] The invention relates to a welding method for a solar battery sheet and an interconnection bar. Background technique [0002] The solar cell soldering process is an important process in the module production process. Its main purpose is to collect the current on the battery sheet and send it out through the interconnection strips. The quality of the solar cell welding effect directly affects the current collection efficiency, the more the current is collected, the less the power loss of the module. Conversely, the less current harvested, the more power loss the component has. [0003] At present, automatic welding technology is mostly used in industrial production to make solar cell welding strings, among which TT automatic welding machines occupy a large market share. This kind of automatic welding machine has fast welding speed and is easy to operate, but because its flux coating device uses flux spraying on the main grid line of the cell, the flu...

AI Technical Summary

Problems solved by technology

This kind of automatic welding machine has fast welding speed and is easy to operate, but because its flux coating device uses flux spraying on the main grid line of the cell, the flux spraying often deviates from the printing accuracy of the main grid line of the battery itself. The position of the main grid line is easy to cause false welding, which not only directly leads to unqualified welding tension, but also increases the series resistance Rs of the module due to the poor contact between the interconnection bar and the cell, the fill factor FF decreases, and the power loss of the cell increases.