金属化膜电容器的恒定湿热试验

Constant Damp Heat Test of Metallized Film Capacitor

随着新能源汽车领域的兴起,电动汽车的发展趋势迅猛,金属化膜电容器以其独特优势在此领域的需求量越来越大。电动汽车的集成模块通常结构紧凑,但散热较差,使得金属化电容器在高温度高湿度的恶劣环境下运行,因此如何提高金属化膜电容器的耐高温高湿性能逐渐成为一项重要的研究内容。本文主要介绍恒定湿热的相关概念和标准,研究金属化膜电容器在恒定湿热(双85)试验中电容量衰减反应机理,阐述加速老化使电容器在早期失效期暴露缺陷双85试验的目的。通过恒温恒湿箱对X2产品进行双85试验,解剖产品心子,呈现金属化膜内部金属层缺失情况,并作出相应分析,并提出了金属化膜电容器通过双85试验的建议,为提高电容器的耐高湿热性能提供理论及试验依据。

With the rise of new energy vehicles,the development trend of electric vehicles is rapid,and the demand of metallized film capacitor is more and more due to its unique advantage in this field.The integrated module of electric vehicles is generally compact in structure but weak in heat dissipation,which makes the metallized capacitor to operate in the high temperature and high humid environment.Therefore how to improve the high temperature and humid resistance perofrmance of the metallized fim capacitor becomes gradually an important study subject.In this paper,the related concepts and standards of constant humidity and heat are introduced,the capacitance attenuation reaction mechanism of metallized film capacitor in constant humidity and heat(double 85)test is studied and the purpose of double 85 test(accelerating aging to expose defects in the early failure stage of capacitor)is described.Double 85 test is carried out on X2 products by constant temperature and humidity chamber,and the core of the product is dissected to reveal the missing metal layer inside the metallized film and corresponding analysis is made.The suggestion of the metallized film capacitor passing double 85 test is proposed so to provide theoretical and test base for the capacitor in high damp and hest resistance.