电池片硫化现象的分析与研究

Analysis and research of vulcanization of solar cells

以晶体硅电池片为研究对象,对电池片出现栅线发暗区域进行分析。采用了SEM扫描、EDS元素分析及烘箱模拟硫化加速等多种分析测试方式,确认栅线发暗是银发生了硫化。同时对此硫化现象的影响因素进行了分析,证明与电池片表面硫含量、封装后电池片所处环境温度、封装包材三者相关。实验表明电池片生产过程中环境中的硫含量越高,电池片越容易硫化;电池片存储或运输温度越高,电池片越容易硫化;封装包材中,EVA泡棉整体为多层孔状结构,可以促进硫化反应的发生,中空板表面为平面结构,可以抑制硫化反应的发生。电池片的栅线硫化不影响其组件的发电性能及可靠性。分析结果有助于电池片厂家解决硫化问题,也有助于组件厂家在遇到有硫化电池片的组件时,分析对组件性能的影响。

In this paper,the crystal silicon cell was taken as the research object,and the fingers darkening area of the cell was analyzed.SEM scanning,EDS elemental analysis and oven simulation vulcanization acceleration were used to confirm that the fingers darkening was caused by silver vulcanization,and the influencing factors of this vulcanization phenomenon were analyzed.It is proved to be related to the sulfur content on the surface of the cell,the ambient temperature of the cell after packaging,and the packaging materials.The results show that the higher the sulfur content in the environment,the easier the cell is to vulcanize.The higher the storage or transportation temperature,the easier the cells are vulcanized;In the packaging materials,EVA foam as a whole is multi-layer porous structure,which can promote the occurrence of vulcanization reaction,and the surface of hollow plate is planar structure,which can inhibit the occurrence of vulcanization reaction.Vulcanization of the solar cell fingers will not affect the power performance and reliability of the modules.The analysis of this paper is helpful for the cell manufacturers to solve the problem of vulcanization,and help the component manufacturers in the encountering of a vulcanized module to analyze the modules performance.