Back plate for metal wrap through (MWT) solar battery

Abstract

The invention discloses a back plate for a metal wrap through (MWT) solar battery and belongs to the technical field of solar photovoltaic batteries. The back plate comprises a base material layer, a first adhesion layer, a second adhesion layer, a weather-resistant layer and an insulating layer. The back plate is characterized by also comprising a metal foil layer, wherein the first adhesion layer is positioned between the base material layer and the metal foil layer and used for bonding the surface of one side, facing the base material layer, of the metal foil layer and the base material layer into a whole; the second adhesion layer is positioned between the base material layer and the weather-resistant layer and used for bonding the surface of one side, facing the base material layer, of the weather-resistant layer and the base material layer into a whole; the insulating layer is bonded on the surface of one side, opposite to the first adhesion layer, of the metal foil layer; an etching line and electrodes are formed on the metal foil layer; the metal foil layer is divided into a plurality of metal foil layer units by the etching line; and the electrodes are respectively formed in the metal foil layer units and exposed out of the insulating layer. The back plate for the MWT solar battery has the advantages that: the weather resistance, size stability, insulativity and sealability in effective blocking of water vapor are improved; the partial discharge power can be improved; the light shading rate of a surface gate line is reduced; and component efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic cells, and in particular relates to a back plate for MWT solar cells. Background technique [0002] The MWT mentioned above is Metallisation Wrap Through or Metal Wrap Through (abbreviated as MWT) in English. Further understanding can be obtained by reading the specifications of CN102203959A (solar cell and its manufacturing method) and CN102132421A (solar cell and its manufacturing method). [0003] The overall structure of solar photovoltaic cells is well known in the industry, including; frame (usually aluminum frame), solar photovoltaic glass installed on the frame, battery sheet (also called silicon wafer or silicon plate) under the solar photovoltaic glass, Hot melt adhesive layer (EVA layer), junction box and backplane (the backplane is customarily called insulating backplane). [0004] In view of the increasing scarcity of non-renewable natural resources such as oil, coal, nat...

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Problems solved by technology

[0007] is not limited to the solar cell backsheets disclosed in the above-mentioned patents. It is not convenient to output electric energy through electrical connection with the battery, and objectively does not give the technical enlightenment on how to realize the electrical connection with the battery

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