复合材料电池包上盖模压成形工艺参数优化

Optimization of compression molding process parameters for upper cover of composite battery pack

为研究复合材料电池包上盖最佳模压成形工艺参数组合,以某新能源汽车电池包上盖为研究对象,首先,选择模压过程中的4个主要工艺参数进行了9组材料级正交实验,检测并对比了层合板的拉伸及弯曲性能。结果表明:在模具温度为150℃、模压压力为10 MPa、预热时间为20 s、保温时间为500 s时,模压后材料的综合力学性能最好,抗拉强度为584.41 MPa、抗弯强度为870.58 MPa。其次,通过材料松弛性能实验确定材料模压时的广义Maxwell模型参数并进行电池包上盖的hyperworks模压仿真,以最大等效应力为判据,确定了最佳工艺参数组合,即模具温度为150℃、模压压力为10 MPa、预热时间为20 s、保温时间为500 s,模压后最小的最大等效应力为210.5 MPa。最后,对最佳工艺参数组合进行验证,结果表明,该产品满足生产及质量要求,说明此最佳工艺参数组合可用于复合材料电池包上盖的批量生产。

In order to study the optimal combination of molding process parameters for the upper cover of composite battery pack,for the upper cover of a new energy vehicle battery pack,firstly,four main process parameters in the molding process were selected,and nine sets of material-level orthogonal experiments were conducted to test and compare the tensile and bending properties of laminates.The re-sults show that when the temperature is 150℃,the molding pressure is 10 MPa,the preheating time is 20 seconds,and the insulation time is 500 s,the comprehensive mechanical properties of the molded material are the best,with the tensile strength of 584.41 MPa and the flexural strength of 870.58 MPa.Secondly,the generalized Maxwell model parameters during the material molding were determined by relaxation property experiments of material,and the hyperworks molding simulation for the upper cover of battery pack was performed.Using the maximum equivalent stress as the criterion,the optimal process parameter combination was determined as the mold temperature of 150℃,the molding pressure of 10 MPa,the preheating time of 20 s and the holding time of 500 s,and the minimum value of maxi-mum equivalent stress after molding was 210.5 MPa.Finally,the process parameter combination was verified.The result shows that the product meets the requirements of production and quality,indicating that this optimal parameter combination can be used for the mass production of the upper cover for composite material battery pack.