Vehicle Lower Structure With Fractureable Battery Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In PHEV vehicles, the arrangement of battery units under the floor creates a risk of rotation behavior during side collisions, which can lead to excessive tension on high-voltage cables, and elongating these cables to mitigate this risk increases electrical resistance.
Innovation Solution
A lower vehicle structure with a frame member extending beside the battery unit, a fixing member that fractures upon collision, and a configuration of load transmission paths to concentrate stress on specific points, preventing rotation and excessive tension on high-voltage cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the high-voltage cable is elongated to avoid excessive tension during battery unit rotation, then the cable can accommodate the rotational displacement, but the electric resistance becomes larger
Solution Approach 1:
The fixing member is pre-configured with a fractureable structure that will break when subjected to collision loads exceeding a predetermined threshold. This preliminary design ensures that during side collisions, the fixing member fractures before the high-voltage cable experiences excessive tension, thereby protecting the cable without requiring it to be elongated and increasing its resistance
Solution Approach 2:
The fixing member acts as an intermediary element between the battery unit and the frame member. It absorbs the collision load through its fractureable structure, mediating the force transmission between the battery unit and the vehicle body, and preventing this force from being transmitted to the high-voltage cable
2Strength
If the fixing member is made strong to securely fix the battery unit, then the battery unit is firmly attached to the frame member, but the battery unit rotates excessively during side collisions
Solution Approach 1:
The fixing member is designed with specific structural parameters including a predetermined fractureable position and load transmission paths that concentrate stress. By changing the structural parameters (creating weakness points at specific locations), the fixing member maintains sufficient strength for normal operation but fractures under collision loads to prevent battery unit rotation
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
Inhibits rotation behavior of the battery unit during side collisions, preventing excessive tension on high-voltage cables and maintaining optimal cable length, thus reducing electrical resistance.
Implementation Method 1
the fixing member is configured to be capable of being fractured when an inward collision load in a vehicle width direction is input to a position in front of a position of a center of gravity of the battery unit
Implementation Method 2
behavior occurs where the frame member is subjected to bending deformation to a vehicle-width-direction inner side
Data Source
AI summary
A lower structure for a vehicle includes a battery unit which is provided under a vehicle body floor, a frame member which extends in a front-rear direction on a vehicle-width-direction outer side of the battery unit, a high-voltage cable which extends forward from a front portion of the battery unit, and a fixing member which fixes a rear portion of the battery unit to the frame member, and the fixing member is configured to be fractured when an inward collision load in a vehicle width direction is input to a position in front of a position of a center of gravity of a first battery unit.