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ACCELERATED DAMP HEAT TEST COMBINING CURRENT STRESSOR

机译：加速潮湿的热试电流应力源

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Damp heat test is one of the crucial qualification test in IEC 61215 standard to evaluate the ability to withstand thermal and humidity penetration. In this paper, by applying with Arrhenius model, the activation energy extracted from extended damp heat for P-multi crystalline silicon PV module is 0.78eV. Furthermore, we simultaneously exert short circuit current (Isc) bias as another stressor to investigate the failure modes and the correlation with temperature and humidity. The acceleration factor for P-multi and P-mono module is 1.48 and 1.46 by applying Isc loading, and it is almost equivalent to that (1.42) of raising temperature from 85°C to 90°C during damp heat. The module with and without electric current bias shows similar failure modes - mainly due to corrosion. We also compared prolonged DH test for bare cell and module by EL, visual inspection and electrical characteristics. The ability of bare cell to withstand the effect of long term penetration of humidity is stronger than we thought. It infers that other material like acetic acid generated by hydrolysis reaction between water vapor and EVA, or finger corrosion induced by flux residual may cause power decay tremendously after damp heat. This corrosion of the electrical interconnects by EVA ｀ flux will be also studied in the future work..
机译：潮湿的热试验是IEC 61215标准的关键资格测试之一，以评估承受热湿度渗透的能力。本文通过施加Arrhenius模型，对P多晶硅PV模块的延伸湿热提取的激活能量为0.78eV。此外，我们同时发挥短路电流（ISC）偏置作为另一个压力源，以研究故障模式和与温度和湿度的相关性。通过施加ISC负载，P-Multi和P-Mono模块的加速度为1.48和1.46，几乎相当于在潮湿的情况下将温度从85°C升温至90°C的那个（1.42）。具有和无电流偏置的模块显示出类似的故障模式 - 主要是由于腐蚀。我们还通过EL，目视检查和电气特性进行了裸电池和模块的长期DH测试。裸露细胞承受长期潮湿效果的能力比我们想象的更强大。它涉及通过水蒸气和EVA的水解反应产生的其他材料，或者通过助焊剂残留诱导的手指腐蚀可能导致功率衰减在潮湿后巨大。 EVA`助焊剂的电气互连的这种腐蚀也将在未来的工作中进行研究。

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