关键词: 纯电汽车；人机工程；整车高度；尺寸链

Abstract: In recent years, competition in the passenger vehicle market has become increasingly intense, and aesthetic design has emerged as a critical factor influencing the sales of popular models. Overall vehicle height serves as an important design variable in shaping a sporty and low-profile styling. Based on a forward ergonomic development approach, this study analyzes mainstream second-row battery electric passenger vehicles, such as sedans and sport utility vehicles (SUV), using the Society of Automotive Engineers (SAE) standard human model as a layout tool to define occupant postures while ensuring ergonomic comfort. Furthermore, the study systematically elaborates on the dimensional influencing factors in the vehicle height direction through three pathways, with a focus on 11 key factors in the dimensional chain related to the rear H-point. It proposes a decomposition strategy for the Z-direction dimensions from the rear heel point to the upper shell of the power battery, as well as for the rear roof slope based on styling aesthetics. By meeting ergonomic performance requirements such as rear occupant seating comfort and headroom, this research provides systematic and practical engineering methods for setting vehicle height targets and achieving precise control over height dimensions.

Key words: battery electric vehicle; ergonomics; overall vehicle height; dimensional chain