Photovoltaic module and welding method of photovoltaic module

Abstract

The invention discloses a welding method of a photovoltaic module. The welding method comprises the steps of: placing a conductive tape between a welding strip and a main grid line of a battery piece, wherein the conductive tape is a metal foil or a piece of conductive cloth with two sides being provided with conductive back adhesive, and the melting temperature of the conductive back adhesive is below 400 DEG C; heating to enable the conductive back adhesive to be melted so as to bond the welding strip with the main grid line of the battery piece; and cooling to complete the welding process. During the welding process, the welding strip and the battery piece are bonded with each other by using the conductive tape, the temperature during the process is below 400 DEG C which is the welding temperature of the welding strip and the battery piece in the prior art, and the welding temperature in the welding process is lower than the welding temperature in the prior art to realize low-temperature bonding so as to relieve the phenomenon of uneven expansion and shrinkage between the welding strip and the battery piece, thus reducing stress generated in the welding process, and reducing the battery fragmentation rate in the welding process of the photovoltaic module. The invention also provides the photovoltaic module produced by using the welding method.

Description

technical field [0001] The present invention relates to the field of photovoltaic technology, in particular to a photovoltaic assembly and a welding method thereof. Background technique [0002] Photovoltaic modules can convert light energy into electrical energy, and the cells encapsulated in the photovoltaic modules are photoelectric conversion units of the photovoltaic modules. [0003] When making photovoltaic modules, the cells are first welded into cell strings with welding tapes, and then the cell strings are laid between the glass and the backplane and connected in series with bus tapes, and then laminated and framed. The production of photovoltaic modules generally includes four processes: welding, laying, lamination, and framing. [0004] In the welding process, single-cell battery sheets are connected in series with welding ribbons in the order of positive and negative electrodes to form a battery string. During welding, high temperature is required to melt the ...

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Problems solved by technology

[0005] During the welding process, it needs to be heated to about 400 degrees Celsius to melt the tin layer on the surface of the ribbon. During the high-temperature heating process, the ribbon is extended, and the tin layer on the surface of the ribbon melts to bond with the battery sheet. After cooling, the ribbon shrinks, and the entire During the process, the size of the cell changes little, and the expansion and contraction between the ribbon and the cell are uneven, causing stress between the two, which can easily cause the cell to break

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