Bus bar, solar cell module and manufacturing method of solar cell module

Abstract

The embodiment of the invention relates to the field of solar power generation, and discloses a solar cell bus bar, a solar cell module and a method for manufacturing the solar cell module. The technical solution of the invention is as follows: a pure aluminum bus bar is adopted, the bus bar and the electrode layer of the solar cell are welded by using an ultrasonic welding method; the contact surfaces of the two are firmly combined; formation of good ohmic contact is realized, and the bus bar can better transmit electric power generated by the solar cell. Compared with the prior art that expensive conductive adhesives or conductive silver paste is required to be coated and then imported hot melt tin welding equipment with a complex structure is used for welding, the bus bar has the advantages that the material and equipment cost is lower, the requirement on the operation precision is lower, and the production cost of the thin film solar cell is reduced.

Description

Technical field [0001] The present invention relates to the field of solar cell modules, in particular to a welding method of solar cell modules and their bus bars. Background technique [0002] At present, in the photovoltaic solar industry, the bus bar refers to the metal conductive bar that connects the anode and the cathode of the output circuit in series or in parallel during the assembly of solar cells. In the technical route of using the molybdenum film layer as the electrode of the thin-film solar cell module, generally, conductive glue is used to bond the bus bar, or the method of high-temperature heat welding is used. The bus bar welded by this method is easy to crack in a high temperature or humid environment. At the same time, this type of glue dispensing equipment requires high control accuracy, complex processes, and low production efficiency. Moreover, in order to reduce the contact resistance, the conductive adhesive needs to add expensive precious metals, such ...

AI Technical Summary

Problems solved by technology

The bus bar welded by this method is easy to crack in high temperature or humid environment

At the same time, this kind of dispensing equipment requires high control precision, complicated process and low production efficiency.

Moreover, in order to reduce the contact resistance, the conductive adhesive needs to add expensive precious metals, such as metallic silver, resulting in high manufacturing costs for such components

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