Simulation of RTM molding process and analysis of void defect in composite battery case

doi:10.19936/j.cnki.2096-8000.20260128.013

Abstract

Abstract: The resin transfer molding (RTM) of the lower case of composite battery pack was designed, and simulation analysis of mold filling process and prediction of void defects based on PAM-RTM software. Firstly, the difference of mold filling time between two schemes in three kinds of outlet states was compared, and the influence of injection pressure and resin viscosity on RTM molding time was analyzed; secondly, the pressure change of the position near the injection port during the mold filling process was analyzed; finally, the distribution of macro/micro scale void defects in the components and the influence of injection pressure on void content were predicted, and the flow rate optimization theory was combined to control the resin. The results show that the injection pressure in the mold cavity can reduce the void content. The results show that the larger the pressure difference between the injection and discharge ports in the mold cavity, the lower the molding time, and it is affected by the injection position. There is a linear relationship between injection pressure and mold filling time, the lower the pressure, the more obvious the effect of shortening the mold filling time and the greater the viscosity of the longer the mold filling time. The void content is related to the front flow rate, the higher the injection pressure leads to the faster flow rate, the macro void formation decreases, and the micro void increases; and the flow rate optimization method of injection can significantly reduce the overall porosity level, but prolongs the molding cycle time.

Key words: lower case of battery pack, resin transfer molding (RTM), numerical simulation, void defect, flow rate optimization, composites

CLC Number:

TB332

ZHANG Sai, ZOU Wentao, SONG Tong, CHENG Congqian, CAO Tieshan, WU Xiaozhong, MENG Xianming, ZHAO Jie. Simulation of RTM molding process and analysis of void defect in composite battery case[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(1): 92-101.

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