단섬유 복합소재 적용 전기차 배터리팩 케이스 구조물의 고강도 경량 설계를 위한 사출 성형-구조 연계 해석

초록

In this study, an improved analysis model is proposed to enhance the impact resistance and lightweight characteristics of the battery pack case structure, which are key components of eco-friendly electric vehicles. Short fiber-reinforced composites were partially applied to the battery pack case structures as a lightweight design strategy, and side-impact analysis were conducted to evaluate the impact resistance performance depending on the use of short fiber composites. Furthermore, a molding-structural coupled analysis was introduced to accurately predict the mechanical behavior of the short fiber-reinforced composite structures manufactured by the injection molding process. The validity of the proposed analysis model was verified by comparing the mechanical behavior of the battery pack case structures with and without the molding-structural coupled analysis. Based on the proposed analysis model, quantitative analyses were performed to assess the impact resistance and lightweight characteristics according to the range of short fiber composite applications in the battery pack case structures, consequently proposing an optimal application of short-fiber composite materials that can comprehensively satisfies design requirements.

키워드