Rear Floor Cross-Member Layout for Battery Space and Crash Rigidity
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Solution Overview
Problem
Hydrogen electric vehicles face challenges in mounting high-voltage batteries and other components in limited rear vehicle spaces, leading to potential damage during crashes due to reduced skeletal rigidity.
Innovation Solution
A rear floor structure with cross members, side sills, and floor panels that form a robust framework to secure component mounting spaces and enhance skeletal rigidity, including a battery mounting space and fixing units to stabilize the high-voltage battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If components are mounted in a limited rear vehicle space, then space utilization is improved, but skeletal rigidity decreases leading to component damage during crashes
Solution Approach 1:
The rear floor structure is segmented into multiple functional zones: a first component mounting space for the high-voltage battery, a second component mounting space for other components, a rear floor front portion, a rear floor center portion, and a rear floor rear portion. This segmentation allows optimized structural design in each zone, maintaining skeletal rigidity while accommodating components in limited space.
Solution Approach 2:
The patent utilizes the vertical dimension by positioning the high-voltage battery in the first component mounting space formed between the rear floor front portion and the rear floor center portion, while other components are mounted in the second component mounting space. This multi-level spatial arrangement maximizes space utilization without compromising the horizontal skeletal rigidity of the rear floor structure.
2Reliability
If a robust framework is constructed to increase skeletal rigidity, then component protection during crashes is improved, but device complexity increases
Solution Approach 1:
The rear floor structure serves multiple functions simultaneously: it provides skeletal rigidity for crash protection, creates mounted spaces for the high-voltage battery and other components, and establishes a foundation for the vehicle body. This multi-functionality reduces the need for separate protective structures, thereby limiting device complexity while improving reliability.
Solution Approach 2:
The patent merges the protective framework function with the component mounting function by integrating the first and second component mounting spaces directly into the rear floor structure. The rear floor front portion, center portion, and rear portion collectively form both the structural framework and the mounting environment, eliminating the need for separate protective enclosures.
Data Source
AI summary
A floor structure of a rear vehicle body, in which at least one component including a high-voltage battery is mounted in a rear portion of a vehicle body, includes: a first cross member coupled to each front portion of first and second rear side members in a vehicle width direction; and a second cross member coupled to the first and second rear side members at a rear of the corresponding first cross member in the vehicle width direction, wherein a space in which the at least one component is mounted is formed between the first cross member and the second cross member.