Ultrasonic welding method and photovoltaic module welded by the method

Abstract

The invention relates to an ultrasonic welding method and a photovoltaic module for welding through the ultrasonic welding method. The ultrasonic welding method is used for welding and connecting interconnected metal wires to a ceramic function thin film on the surface of a photovoltaic battery, wherein the welding frequency of ultrasonic welding ranges from 15 kHz to 65 kHz, the interface pressure density ranges from 0.01 Mpa to 6 Mpa, the time ranges from 1 ms to 500 ms, the welding temperature ranges from 25 DEG C to 350 DEG C, and the ceramic function thin film is a metal-rich ceramic thin film in non-uniform chemical proportion. A photovoltaic battery in the photovoltaic module is electrically connected with other photovoltaic batteries through the interconnected metal wires, and the interconnected metal wires are welded and connected to the ceramic function thin film on the surface of the photovoltaic battery in an ultrasonic welding mode. The method and the photovoltaic module have the advantages that compared with the traditional interconnection technology of the thin interconnected metal wires and the photovoltaic battery, the wires are directly arranged on and welded to the surface of the photovoltaic battery through the innovative ultrasonic welding technology, transparent thin films and adhesives are omitted, cost is reduced, and reliability is improved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic module structure and interconnection method thereof, in particular to an ultrasonic welding method and a photovoltaic module welded by the method. Background technique [0002] At present, most manufacturers of photovoltaic cells and components in the industry adopt a battery electrode design and interconnection method of 2 to 5 bus bars. First, in the manufacturing process of photovoltaic cells, about 55-90 thin grid lines with a width of 60-100 um are formed on the light-receiving surface of a battery cell by screen printing and high-temperature sintering. These thin grid lines are generally connected together by two 1.8mm main grid lines. Then, during the manufacturing process of the photovoltaic module, the busbar of the battery is electrically connected with the Cu interconnection strip coated with the Sn layer through a high temperature (~200° C.) welding process. The light-generated ...

AI Technical Summary

Problems solved by technology

We have found through experiments that during the lamination process, EVA will push the thin copper wire upwards away from the surface of the battery along the arc surface of the lower part of the thin copper wire, which may break the soldering point, thus affecting the appearance and reliability of the photovoltaic module.

[0007] In the above solution, since the film and the adhesive remain in the solar cell module, this means that there are relatively high requirements on the long-term stability of the adhesive and the film, which also leads to relatively high costs

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