Vehicle Lower Section Battery Protection Framework
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Solution Overview
Problem
Existing vehicle lower section structures lack adequate framework members around batteries, leading to potential deformation during collisions, which can cause contact between the deformed body and the battery.
Innovation Solution
A vehicle lower section structure featuring a pair of rear side-members, first and second cross-members, and a reinforcement member that surround the battery, distributing collision loads to prevent deformation and reduce the likelihood of battery contact during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no framework member is provided around the battery, then device complexity is reduced, but battery protection against deformation during collision deteriorates
Solution Approach 1:
The framework is divided into multiple discrete members (pair of rear side-members, first cross-member, second cross-member) that are strategically positioned around the battery. This segmentation allows each member to independently contribute to battery protection while maintaining overall structural efficiency and avoiding excessive complexity.
2Reliability
If framework members surround the battery, then battery deformation is suppressed, but device complexity increases
Solution Approach 1:
Multiple framework members (rear side-members and cross-members) are merged into a unified structural arrangement that collectively surrounds the battery. This merging creates an integrated protective cage that suppresses battery deformation while optimizing the overall complexity by having members work together rather than as separate redundant systems.
Data Source
AI summary
A vehicle lower section structure includes: a pair of rear side-members that is disposed in a vehicle lower section so as to be separated from each other in a vehicle width direction, and that are extending in a vehicle front-rear direction; a first cross-member extending in the vehicle width direction, to which the rear side-members joined; a second cross-member extending in the vehicle width direction at the rear of the first cross-member in the vehicle front-rear direction, to which the rear side-members joined; and a battery that is housed in a housing section surrounded by the rear side-members, the first cross-member, and the second cross-member, at least part of the battery overlapping with the rear side-members when viewed along the vehicle width direction, and at least part of the battery overlapping with the first cross-member and the second cross-member when viewed along the vehicle front-rear direction.