Study on Vibration Characteristics of Mode-free Power Battery Pack
In order to investigate the vibration characteristics of a mode-free battery pack for an electric vehicle,two simplified finite element models of battery packs with different cell sizes and cell layouts were established.Based on the fi-nite element model of the battery pack,the static analysis and modal analysis of the two battery packs were carried out under three limit conditions.Based on the analysis results the improved design was performed on the battery pack.The results show that the cell size and cell layout in the power battery pack have significant influence on the vibration characteristics of the power battery pack.The upper cover stiffness of battery pack 1.0 is insufficient,the maximum stress and maximum defor-mation of the upper cover are large,and the natural frequency of the first order constrained mode is lower than the common road excitation frequency,which is likely to cause resonance of battery pack.The power battery pack 2.0 has good static characteristics,and the first-order natural frequency is higher than the common road excitation frequency,which can avoid resonance with road excitation.After the improvement of the upper cover,the static and vibration characteristics of the pow-er battery pack 1.0 can meet the requirements.Increasing the confined range of the battery pack can raise the first-order natu-ral frequency.
vibration and wavemode-free power battery packvibration characteristicsstatic analysismodal analysis
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