电动车电池包壳体辐射噪声性能研究

Study on Radiation Noise Properties of Electric Car Battery Packs

以某电动车电池包壳体辐射噪声控制为研究对象。首先,构建电池包壳体辐射噪声仿真模型,并采用有限元法和边界元法进行分析计算。然后,通过传递路径分析,研究电池包辐射噪声产生机理,获知增加上盖加强筋高度对改善辐射噪声效果不佳,提升支耳动刚度、合理设计上盖加强筋分别有利于改善中高频和低频辐射噪声。最后提出一种上盖加强筋多目标形貌优化方法,有针对性地衰减低频段内关注频率下的辐射噪声。基于上述研究,构建一套电池包壳体低噪声优化设计流程,可在产品开发初期为结构设计提供直接指导,具有良好的工程实用价值。

The radiation noise control of an electric vehicle battery pack shell is studied.Firstly,the simulation model of shell radiation noise of the battery pack is constructed,and the radiation noise is calculated and analyzed by finite element method and boundary element method.Then,through the transmission path analysis(TPA),the mechanism of the battery pack radiation noise is studied.It is found that increasing the height of the top cover stiffener is not effective for reducing the radiation noise,but improving the dynamic stiffness of the lugs and rationally designing the top cover stiffener can reduce the middle-high-frequency and low-frequency radiation noises respectively.Finally,a multi-objective topography optimization method for the top cover stiffener is proposed to reduce the radiation noise at the interested frequencies in the low frequency band.Based on the research,a set of low-noise optimization design process for battery packs is constructed,which can provide a direct guidance for structural design in the early stage of product development,and has a good engineering practical value.