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Simplified detection method of the rear-side weak soldering for monofacial solar cell using electroluminescence quantitative technology
Applied Physics A ( IF 2.7 ) Pub Date : 2021-04-26 , DOI: 10.1007/s00339-021-04510-z
Minglei Lu , Guoqiang Hao , Xiaojun Ye , Cihua Peng , Cui Liu , Hongbo Li

In the series soldering step of photovoltaic module manufacturing process, soldering could be occasionally found weak or missing between busbar and interconnection ribbon. The affected modules have local heating phenomenon in application, which aggravates modules efficiency degradation. Electroluminescence (EL) technology can detect many module defect types including weak soldering. But the grayscale change of EL image is not obvious enough caused by rear-side weak soldering (RWS) compared with front-side weak soldering, especially for monofacial solar cell. RWS is difficult for manual qualitative identification. In this paper, we use EL quantitative technology and simply define deviation percentage (Si) to distinguish types of weak soldering. RWS can be effectively detected through grayscale analysis of EL images under two different bias current conditions, which is verified by experiments and simulation. Further simulation results suggest that higher rear-side lateral resistance leads to lower Si of RWS. This method is instructive for the automatic EL detection in module production line.



中文翻译:

基于电致发光定量技术的单面太阳能电池背面弱焊的简化检测方法

在光伏模块制造过程的串联焊接步骤中,有时会发现母线和互连带之间的焊接较弱或缺失。受影响的模块在应用中会出现局部发热现象,这会加剧模块效率下降。电致发光(EL)技术可以检测许多模块缺陷类型,包括弱焊接。但是,与正面弱焊接相比,由背面弱焊接(RWS)引起的EL图像灰度变化不够明显,尤其是对于单面太阳能电池而言。RWS难以进行人工定性鉴定。在本文中,我们使用EL定量技术并简单地定义偏差百分比(S i)以区分弱焊接类型。通过在两种不同的偏置电流条件下对EL图像进行灰度分析,可以有效地检测到RWS,并通过实验和仿真进行了验证。进一步的仿真结果表明,较高的背面侧向电阻会导致RWS的S i较低。该方法对模块生产线的自动EL检测具有指导意义。

更新日期:2021-04-26
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