Photovoltaic backboard chloride ion permeability testing method and device

Abstract

The invention discloses a photovoltaic backboard chloride ion permeability testing method and device. The device comprises a permeating tank, a permeance tank, a conductivity electrode, two graphite electrodes and a conductivity meter. The permeating tank contains a high-concentration sodium chloride solution. The permeance tank contains a low-concentration sodium chloride solution. Stirrers are arranged in the permeating tank and the permeance tank. The permeating tank and the permeance tank are connected through a connecting cylinder transversely arranged. A photovoltaic backboard to be tested is vertically inserted into the middle of the connecting cylinder to partition the connecting cylinder into isolated left and right parts. The isolated left and right parts are communicated with the permeating tank and the permeance tank respectively. The conductivity electrode is located in the permeance tank and is close to the photovoltaic backboard. The conductivity meter is connected with the conductivity electrode. The two graphite electrodes are located in the permeating tank and the permeance tank respectively. The two graphite electrodes are connected with a voltage stabilizing power source. The device is simple in structure and capable of fast testing chloride ion permeability of the photovoltaic backboard. The invention discloses the testing method.

Description

technical field [0001] The invention relates to a method and equipment for testing the performance of a photovoltaic backplane, in particular to a method and a device for testing the chloride ion permeability of a photovoltaic backplane. Background technique [0002] As we all know, the design service life of photovoltaic modules is required to be more than 25 years. Therefore, corresponding working life requirements are also put forward for the supporting materials that make up the modules. As the key material in the photovoltaic module after the cells, the backsheet is located on the outermost layer of the module and plays a role of protection and support for the photovoltaic module. Water vapor transmission rate is an important index to measure the performance of photovoltaic backsheet. If the water vapor transmission rate of the backsheet is high and the barrier to water vapor is poor, the moisture in the atmosphere will enter the photovoltaic module through the backshe...

AI Technical Summary

Problems solved by technology

If the water vapor transmission rate of the backsheet is high and the barrier to water vapor is poor, the moisture in the atmosphere will enter the photovoltaic module through the backsheet, causing the hydrolysis of the encapsulation film (EVA) and the oxidation of the cells. The grid lines on the surface of the cell and the corrosion of the silver paste will eventually affect the power generation efficiency of the photovoltaic module

[0003] At present, the industry generally pays attention to the water vapor transmission rate of photovoltaic backsheets, and little attention has been paid to the influence of chloride ions, which are widely present in the marine atmospheric environment where photovoltaic modules used on seashores and islands, on the power generation efficiency of photovoltaic modules

From the point of view of the particle radius alone, the radius of water molecules is roughly equivalent to that of chloride ions, both about 0.2 nanometers, and chloride ions are polar particles, which are more likely to migrate to the inside of the module under the action of an electric field, causing grid lines or Corrosion of silver paste

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