Vehicle Lower Structure Reinforcement for Side-Collision Battery Fixation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle designs face issues with the release of side sill and battery fixation during side-collision loads due to the large size and weight of the battery, leading to potential detachment and deformation.
Innovation Solution
A lower vehicle structure with a reinforcing member having a closed-cross section, fixed to the side sills and battery frame via bolts, efficiently transmits collision loads to the cross member, maintaining the battery's rigidity and preventing detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a large-sized battery with large capacity is installed under the floor, then the energy storage capacity is improved, but the fixation stability under side-collision load deteriorates
Solution Approach 1:
The battery fixation system is segmented into multiple independent fixation points distributed along the side sills, rather than relying on a single fixation location. This segmentation allows the heavy battery to be securely anchored at multiple positions, distributing the collision load across several fixation points and preventing detachment during side-collision events.
Solution Approach 2:
The cross member is pre-installed and pre-positioned above the battery before collision occurs, creating a preliminary structural framework that is specifically designed to receive and distribute collision loads. This preliminary action ensures that when side-collision occurs, the load transmission path is already in place to prevent battery detachment.
2Device complexity
If the battery is fixed only to the side sill, then the fixation structure is simple, but the load transmission efficiency under side-collision deteriorates
Solution Approach 1:
The cross member serves as an intermediary element between the side sill and the battery. When side-collision occurs, the cross member mediates the load transmission by receiving the collision load from the side sill and distributing it to the battery, creating an efficient load transmission path without requiring complex direct fixation structures.
Solution Approach 2:
The fixation system merges multiple functional elements into a unified structure: the side sill provides structural support, the cross member provides load distribution, and the battery provides both energy storage and acts as a load-receiving mass. This merging creates an integrated system where each component contributes to both its primary function and load transmission.
3Ease of manufacture
If the stiffener is configured with inner side positioned upward, then the manufacturing is simplified, but the collision load resistance deteriorates
Solution Approach 1:
Instead of positioning the stiffener's inner side upward for manufacturing convenience, the invention inverts this configuration by positioning the inner side downward. This inversion allows the stiffener to effectively engage with the cross member and battery structure, creating a more effective load-resistant configuration that prevents battery detachment during side-collision while still maintaining manufacturing simplicity.
Data Source
AI summary
A vehicle comprises a pair of side sills, a cross member, a battery, and a reinforcing member. The battery is arranged below the cross member and has a battery frame. The reinforcing member is stored in a hollow portion of the side sill and has a body portion having a closed-cross section. The body portion is arranged in an area which overlaps the cross member in a side view of the vehicle, when viewed from one side of a vehicle width direction. The side sill, the battery frame, and the reinforcing member are fixed by a bolt and a nut. The bolt penetrates a backet and its tip portion penetrates toward the body portion of the reinforcing member.