Standards Development
This document is to classify cells with black arc in electroluminescence (EL) tests of n-type crystalline silicon photovoltaic cells. According to IEC 63202-2, the images of black arc photovoltaic cells can be divided into the following four categories according to the characteristics of black arc, ring free PV cell, incomplete black ring PV cell, complete black ring PV cell and wide dark ring PV cell. According to the requirements of IEC 61215 and IEC 61730, a series of reliability tests were carried out, including LID 60KWH, PID 96h, DH1000, TC200, TC50 + HF10, ML, hot spot, etc. to verify the effectiveness of the classification.
Black arc are a common phenomenon in the photovoltaic industry, especially in n-type crystalline silicon photovoltaic cells. There have no effect on the conversion efficiency and reliability age test when some black arc cells had been encapsulated to module, but some black arc cells can cause lower power and higher temperature when hot spot test. Therefore, the classification of black arc photovoltaic cells can prevent the evaluation of the cell EL test from being too strict, which could result in qualified cells being screened out. On the one hand, this document can reduce the waste of resources and increase profitability; on the other hand, it provides different categories of black arc cells that meet the reliability performance requirements of modules. This document certainly can play a role in guiding and standardizing industrial production.
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