Abstract: Analyzes a certain type of pure electric urban logistics vehicle battery box’s finite element modal and experimental modal,giving its modal frequencies and mode type.And by comparing the finite element modal and experimental modal’s analysis results,verify the reliability of the battery box finite element model.Based on the experimental modal analysis to get region and goals for battery box to optimize.Using the finite element method of comparative battery box before and after optimization mode,the results show the optimized battery box modal frequency has been generally improved.It has a certain reference value to the battery box structure design.

Key words: battery box, modal characteristics, test verification, structure optimization