Battery Case Crossmember Bracket for Collision Load Transfer
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Solution Overview
Problem
Existing vehicle lower-portion structures that integrate a crossmember with a cover plate serving as a floor panel can compromise battery performance due to the need for direct fixation, which affects the integrity and functionality of the battery.
Innovation Solution
A vehicle lower-portion structure that includes a crossmember extending in the vehicle-width direction, with a bracket and fastener system that avoids direct fixation to the battery case, using a bracket with a joining portion and fastening portion to secure the crossmember, and incorporates a recessed design to enhance reinforcement and absorption of collision loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crossmember is directly fixed to the cover plate by forming a hole in the cover plate, then the collision load transmission is improved, but the battery performance is compromised
Solution Approach 1:
The patent introduces a bracket as an intermediary component between the crossmember and the cover plate. The bracket includes a joining portion that connects to the crossmember and a fastening portion that attaches to the cover plate, thereby mediating the connection and avoiding direct fixation that would compromise battery performance.
Solution Approach 2:
The connection structure is segmented into three separate components: the crossmember, the bracket, and the cover plate. The bracket is further divided into a joining portion and a fastening portion, allowing the collision load transmission function to be separated from the battery protection function.
2Reliability
If the bracket and crossmember are fixed with multiple fasteners, then the fastening reliability is improved, but the assembly complexity increases
Solution Approach 1:
The patent combines multiple fastening functions into a single integrated bracket component. The bracket's joining portion and fastening portion work together as one unit, eliminating the need for separate fastening mechanisms and reducing assembly complexity while maintaining fastening reliability.
Data Source
AI summary
A vehicle lower-portion structure includes a battery case disposed in a lower portion of a vehicle, the battery case accommodating a battery, a crossmember disposed on a vehicle upper side from the battery case, the crossmember extending in a vehicle-width direction, a bracket provided between the battery case and the crossmember, the bracket including a joining portion joined to an upper surface of the battery case and a fastening portion having an insertion hole, and a fastener provided through the insertion hole to fix the crossmember and the battery case.