Battery Side Frame Asymmetric Cross-Section for Side Collision Protection
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Solution Overview
Problem
In vehicle body bottom structures, the side surface of the battery pack is displaced and potentially damaged during a side collision, necessitating a more reliable protection mechanism for the battery pack.
Innovation Solution
A vehicle body bottom structure featuring a battery pack positioned below a floor panel, with a side sill extending in the vehicle front-rear direction and a battery side frame that supports the battery pack, where the battery side frame's lower surface is positioned outside and lower than the support portion within the vehicle width direction, enhancing the side sill's ability to absorb collision loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a side sill is used to support the battery pack during side collision, then the battery pack protection is improved, but the side surface of the battery pack is displaced and bent upward causing potential damage
Solution Approach 1:
The battery side frame is designed with asymmetric cross-section where the lower surface is positioned outside in the vehicle width direction and lower than the support portion. This creates different structural properties at different locations: the support portion (inside) provides upward support while the lower surface (outside) remains lower to prevent bending, allowing the frame to selectively resist different types of forces applied during side collision.
Solution Approach 2:
The invention introduces a vertical height difference dimension to the battery side frame structure. By positioning the lower surface lower than the support portion in the vertical direction, the frame gains the ability to control deformation patterns during side collision, preventing the side surface from bending upward while still providing necessary support.
2Device complexity
If the battery side frame lower surface is positioned higher, then the support structure is simplified, but the battery pack becomes vulnerable to damage during side collision
Solution Approach 1:
The asymmetric cross-sectional design concentrates structural complexity only where needed - at the support portion inside the vehicle width direction. The lower surface outside remains simpler and lower, creating a differentiated structure that provides enhanced protection precisely where the battery pack is most vulnerable during side collision.
3Reliability
If the lower surface of the battery side frame is positioned outside and lower than the support portion, then the battery pack protection is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The asymmetric cross-sectional shape with the lower surface positioned outside and lower than the support portion creates a structurally distinctive feature that is easy to identify and control during manufacturing. This localized geometric characteristic allows for focused quality control at the critical positioning points while maintaining overall manufacturing feasibility.
Data Source
AI summary
An object of the present invention is to provide a vehicle body bottom structure capable of more reliably protecting a battery pack at a time of a side collision of a vehicle. A vehicle body bottom structure of the present invention includes a battery pack disposed below a floor panel, a side sill extending in a vehicle front-rear direction outside in a vehicle width direction and a battery side frame allowing the side sill to support the battery pack, wherein the battery side frame has a lower surface positioned outside in the vehicle width direction and positioned lower than a support portion for the battery pack, the support portion being formed inside in the vehicle width direction of the battery side frame.