PID effect resistant solar cell module

Abstract

The invention relates to a PID effect resistant solar cell module, and the module comprises a module frame, solar cell glass, a cell piece and a back plate, wherein the solar cell glass, the cell piece and the back plate are disposed in an installation groove of the module frame and are sequentially stacked. The interior of the installation groove is provided with sealing glue, and a first packaging layer is disposed between the solar cell glass and the cell piece. A second packaging layer is disposed between the cell piece and the back plate, and the first and second packaging layers are made of the same material. Each packaging layer comprises a blocking layer, a first adhesive layer and a second adhesive layer, wherein the first and second adhesive layers are disposed at two sides of the blocking layer, and the blocking layer is a polyolefin blocking layer made of ethylene-alpha-olefin polymer. Each adhesive layer is made of ethylene-vinyl acetate copolymer, and the cell piece is a back contact solar cell. According to the invention, the blocking layer can block steam from entering the solar cell module through the back plate. The structure can slow down the migration of sodion. The module solves a problem of potential induced attenuation in a wet and hot environment from two aspects, and prolongs the service life.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell module resistant to PID effect. Background technique [0002] At present, the "potential-induced decay" PID problem exists in photovoltaic power plants at home and abroad, which has become a technical problem for component factories to encounter complaints and even return compensation. The actual operation of some power stations shows that: photovoltaic modules have been used in a high-pressure and humid environment for a long time, and water vapor enters the module through the backsheet, causing the widely used EVA to hydrolyze to produce acetic acid, which reacts with the alkali precipitated on the glass surface to produce freely mobile sodium ions , and then a large number of sodium ions move to the surface of the battery under the action of the electric field, which deteriorates the passivation effect of the surface of the battery, and a loop leakage current ...

AI Technical Summary

Problems solved by technology

The actual operation of some power stations shows that: photovoltaic modules have been used in a high-pressure and humid environment for a long time, and water vapor enters the module through the backsheet, causing the widely used EVA to hydrolyze to produce acetic acid, which reacts with the alkali precipitated on the glass surface to produce freely mobile sodium ions , and then a large number of sodium ions move to the surface of the battery under the action of the electric field, which deteriorates the passivation effect of the surface of the battery, and a loop leakage current will be formed between the glass, packaging material, battery, backplane and module frame, resulting in the power of the photovoltaic module Significant attenuation, that is, the PID phenomenon

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