随机振动与冲击条件下电动车电池包结构响应分析

摘要

为提高电动汽车电池包结构安全性和电连接可靠性,更好地预判和分析电池包结构损伤和电接触可靠性,建立了电池包精细化模型,通过电池包模态试验验证了模型的有效性;从应力值和加速度两个方面分析了电池包在稳态随机振动和瞬态冲击下的结构损伤和电接触可靠性.结果表明,电池包整体模态对触点的动态响应影响很大;同一振动工况下不同位置触点的应力和加速度都很不均匀;冲击工况产生的交变应力比稳态工况对电池包造成的结构伤害和对内部电触点可靠性的影响都更大.分析结果可为电池包安全性设计、接触保护设计和疲劳寿命预测等提供参考.%To enhance the structural safety and electric connection reliability of battery pack in electric ve-hicle and to better predict and analyze the structural damage and connection reliability of battery pack, a refined model for battery pack is established with its effectiveness verified by modal test,and the structural damage and con-nection reliability of battery pack under steady random vibration and transient impact are analyzed from the aspects of stress and acceleration.The results show that the overall modality of battery pack has a significant influence on dy-namic response of electric connections and under a same vibration excitation,the stresses and accelerations of con-nections in different positions are significantly different. Compared with steady random vibration conditions, the al-ternating stresses produced in transient impact conditions have greater effects on the structural damage and internal connection reliability of battery pack. The results of analysis provide a reference for the safety design, connection protection design and fatigue life prediction of battery pack.