锂电池运输包装设计与跌落仿真分析

目的 文中以深圳市某科技公司新型动力锂离子电池为研究对象，为其设计缓冲运输包装。方法 结合相关测试标准运用仿真软件ANSYS Workbench对锂电池及其包装件进行跌落仿真分析，并结合跌落试验结果以验证仿真模型的可靠性。结果 裸机跌落时，外壳等效应力最大值为720.41 MPa，超过硬质铝合金的许用应力325 MPa，外壳将会发生破裂;电芯的等效应力最大值为363.4 MPa，超过铝的许用应力280 MPa，可导致电芯损毁;锂离子电池运输包装件跌落仿真结果显示，外壳、电芯、散热板、PCB板等各部件的最大等效应力值较裸机跌落时分别降低了73.66%、39.82%、38.65%、81.70%，且其等效应力的最大值均未超过对应材料的屈服强度。结论 综合变形云图及实验结果，采用EPP泡沫和BC瓦楞纸箱的锂离子电池运输包装结构具有较好的防护效果，能够满足抗冲击强度要求。

Transport Packaging Design and Drop Simulation Analysis of Lithium Battery

The work aims to take a new power lithium battery produced by a technology company in Shenzhen as the research object and design a buffer transport package for such battery. According to the relevant test standards, the simulation software ANSYS Workbench was used to simulate the surface drop of the lithium battery and its package. Then, combined with the drop test results, the reliability of simulation model was verified. When bare battery dropped, the maximum equivalent stress of the shell was 720.41 MPa, exceeding the allowable stress of hard aluminum alloy of 325 MPa, and the shell cracked. Besides, the maximum equivalent stress of the battery core was 363.4 MPa, exceeding the allowable stress of aluminum of 280 MPa and causing damage to the battery core. The drop simulation results of the lithium battery transport package proved that the maximum equivalent stress values of the shells, cells, heat sinks, PCB boards and other components were reduced by 73.66%, 39.82%, 38.65%, and 81.70%, respectively, compared with those values generated when bare battery dropped. The maximum equivalent stress did not exceed the yield strength of the corresponding material. Comprehensive deformation cloud diagram and experimental results show that the lithium battery transport packaging structure adopting EPP foam and BC corrugated boxes has a good protective effect and can meet the requirements of impact strength.