基于ANSYS的单面粘结悬挂锂离子电池组的应力分析

锂离子电池组结构件重量占比偏大往往是造成锂离子电池模组的比能量低下的重要原因之一。目前,常用的锂离子电池组结构包括箱体式、拉杆式或者夹板式,电池组成组结构件比重在10%~30%之间,然而某锂离子电池组要求结构件比重小于5%。文章对结构件进行了超大幅度的减重,采用单面粘结悬挂固定锂离子电池堆的方法将电池堆固定在近似圆形且镂空的面板上,使得整体结构件比重达到3.5~4.5%。针对该种结构,文章基于ANSYS对电池组内部应力进行了分析,结果表明该锂离子电池组的结构设计虽然特殊,但其内部各个环节的应力安全系数较大,同样具有高的可靠性。

The large weight proportion of lithium-ion battery structure is often one of the important reasons for the low specific energy of lithium-ion battery module.At present,the commonly used lithium-ion battery pack structure includes box type,pull rod type or splint type.The proportion of battery components is between 10%and 30%.However,a lithium-ion battery pack requires that the specific gravity of the structure is less than 5%.In this paper,the weight of the structure is reduced by a great deal,and the battery stack is fixed on an approximately circular and hollowed-out panel by single-sided bonding and hanging,so that the specific gravity of the whole structure reaches 3.5%to 4.5%.In view of this kind of structure,the internal stress of the battery pack is analyzed based on ANSYS.The results show that although the structural design of the lithium-ion battery pack is special,its internal stress safety factor is large,and it also has high reliability.