Method for electrically connecting several solar cells and photovoltaic module

Abstract

The invention relates to a method for metallizing and connecting solar cell substrates (1) and to a photovoltaic module (100) made of several metallized solar cells (20) that are electrically connected to one another. According to the invention, a solar cell substrate (1), in which second metal layers (2a, 2b) forming electrical metal contacts are optionally provided, is attached to a carrier substrate (4), on the surface of which at least one first metal layer (3) is formed in a suitable pattern. By localized irradiation of the metal layer (2, 3) with laser radiation (5, 6) through the solar cell substrate (1) or the carrier substrate (4), energy is introduced such that the metal layer (2, 3) is heated by absorbed laser radiation (4, 5) for an irreversible bonding to the adjacent surface of the solar cell substrate (1). By the laser bonding of the metal layer (3) on the carrier substrate (4) to the solar cell substrate (1), solar cells can be connected to form a photovoltaic module, wherein conventional soldering of adjacent solar cells via metal bands is no longer required. Non-solderable, cost-effective, in particular silver-free metal layers (2a, 2b) can thus be used for contacting the solar cell substrates (1) of the solar cells (20).

Description

technical field [0001] The present invention relates to methods of metallizing and electrically connecting multiple solar cells. The invention also relates to photovoltaic modules thus constructed. Background technique [0002] The surface of the solar cell substrate must often be metallized, eg to allow electrical connection to the solar cells, in particular to be able to electrically connect different solar cells together. The metallization of the solar cell should first of all be mechanically robust and therefore stable over the typical service life of a solar cell module, for example 30 years, in order to keep degradation effects as low as possible. Secondly, through the metallization, good electrical contacting of the solar cell substrate should be achieved with the lowest possible electrical resistance. Furthermore, the metallization should be carried out reliably and economically on an industrial scale. [0003] In the production of photovoltaic modules, a pluralit...

AI Technical Summary

Problems solved by technology

However, these materials are not inherently solderable and thus previously required the application of a further solderable layer of the metal which is complex and expensive

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