Battery Case Mounting Frame for Side Collision Energy Absorption
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Solution Overview
Problem
Conventional vehicle body structures with battery cases mounted below the floor panel face damage during side collisions due to the lack of effective absorption mechanisms, leading to potential battery case damage.
Innovation Solution
A vehicle body structure featuring a battery case connected to a case-mounting frame that includes a lower frame with a fragile portion and an upper frame, designed to deform and absorb side collision loads while preventing damage to the battery case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an easily crushed portion is provided on the side portion of a battery case to absorb side collision load, then the side collision load can be absorbed by crushing and deforming the easily crushed portion, but after the easily crushed portion is completely crushed it becomes a mere hard mass that may collide with the battery case and damage it
Solution Approach 1:
The case-mounting frame is divided into multiple components: lower frame, upper frame, and fragile portion. This segmentation allows each part to perform specific functions during collision - the fragile portion crushes to absorb energy while the upper frame remains intact to protect the battery case from damage by the crushed mass
Solution Approach 2:
The fragile portion acts as an intermediary element between the side collision load and the battery case. It is positioned between the lower frame and upper frame to absorb collision energy through controlled crushing, preventing the force from directly damaging the battery case while avoiding the creation of a hard mass that could collide with it
2Loss of energy
If the case-mounting frame is designed to deform and absorb side collision load, then sufficient deformation stroke can be secured to absorb the load, but the structure becomes more complex with multiple frames and fragile portions
Solution Approach 1:
The case-mounting frame merges the lower frame, upper frame, and fragile portion into a single integrated structure that supports the battery case. This unified design achieves complex deformation behavior for energy absorption without requiring multiple separate components, thus reducing overall structural complexity while maintaining effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed structure effectively absorbs side collision loads through controlled deformation of the case-mounting frame, reducing the risk of battery case damage and ensuring reliable energy storage during collisions.
Implementation Method 1
the case-mounting frame is bent and deformed so that an end portion of the lower frame on the side sill side and an end portion of the upper frame on the battery case side come closer to each other
Implementation Method 2
the fragile portion is actively crushed and deformed at the same time
Data Source
AI summary
A vehicle body structure includes: a battery case that is disposed below a floor panel of a vehicle body and houses a battery; and a case-mounting frame that connects the battery case to a side sill provided on a side of the battery case in a vehicle width direction to support the battery case. The case-mounting frame includes a lower frame that straddles between the side sill and the battery case, and an upper frame that rises from the lower frame, supports the battery case, and is disposed side by side with the battery case in the vehicle width direction. The lower frame includes a fragile portion that is provided at a position located below the upper frame and is more fragile than another position other than the first position.