基于单体挤压实验的电池包挤压安全阈值的估算

Estimation of safety threshold of battery pack extrusion based on single cell extrusion experiment

为了研究基于单体电池各面挤压获得的安全阈值,推广应用到电池包级别的方法,根据某三元电池各面在25 mm直径球头挤压作用下获得大量的挤压实验数据,总结出电池各面的机械安全阈值分布规律。借助于有限元仿真手段估算整包挤压安全阈值,首先提出了卷芯所有实体网格单元包壳,然后叠加外部铝壳单元的建模方式,将实验获得的卷芯材料特性参数,作为电池各面本构模型参数的输入,经过电池三个位置的实验修正和模组模型的进一步可行性验证,最终将对标后的电池本构模型应用于电池包挤压安全阈值的估算,并经过电池包挤压实验验证了该建模方式和电池包安全阈值估算方法的可行性。研究成果为电池箱体的极限设计或轻量化设计提供了解决思路。

In order to study the safety threshold obtained based on the extrusion of each side of a single battery and extend the method to the battery pack level,the distribution law of mechanical safety threshold of each side of a terpolymer battery according to a large number of extrusion test data obtained under the extrusion of a 25 mm diameter ball head was summarized,and the whole pack extrusion safety threshold by means of finite element simulation was estimated.Firstly,the modeling method of all solid grid cell cladding of the coil core was proposed,and then the external aluminum shell shell element was superimposed.Then,the core material characteristic parameters obtained by the test were used as the input parameters of the constitutive model of each side of the battery,and the test modification of the three positions of the battery and the further feasibility verification of the module model were carried out.Finally,the benchmarking battery constitutive model was applied to estimate the safety threshold of battery pack extrusion,and the feasibility of the modeling method and the estimation method of battery pack safety threshold was verified by the battery pack extrusion test.The research results provide a solution for the limit design or lightweight design of battery box.