Rear Floor Battery Mounting Structure for Vehicle Body
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Solution Overview
Problem
Vehicles with large-capacity batteries face challenges in installing and protecting the battery due to space constraints and crash regulations, particularly in SUVs and MPVs, where a robust vehicle body structure is needed to secure the battery during collisions while minimizing occupancy of passenger and cargo space.
Innovation Solution
A vehicle body structure with a battery mounting portion on the rear floor, reinforced by a cross member, lower reinforcement frames, and an upper fixing portion, along with buffer frames for energy absorption, which also allows for the installation of a large capacity battery without restricting rear seat movement or interfering with a propeller shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large-capacity battery is installed in the rear of the vehicle, then the battery capacity increases, but the passenger and cargo space is reduced
Solution Approach 1:
The battery is installed in the longitudinal direction along the side of the vehicle rather than occupying the rear cargo space, utilizing the side dimension of the vehicle body to accommodate the battery while preserving rear space for passengers and cargo
2Ease of manufacture
If the battery is mounted on the rear floor, then the battery installation is simplified, but the floor rigidity is insufficient to protect the battery during collisions
Solution Approach 1:
The floor reinforcement structure is divided into multiple segments including a cross member, lower reinforcement portion with first and second reinforcement frames, and an upper fixing portion with multiple fixing frames, where each segment contributes to overall structural strength while maintaining installation simplicity
Solution Approach 2:
The floor structure combines the original floor with additional reinforcement components made of high-strength materials to create a composite structure that provides enhanced protection for the battery while maintaining ease of installation
3Reliability
If reinforcement structures are added to protect the battery, then the collision protection improves, but the device complexity increases
Solution Approach 1:
Multiple reinforcement functions are merged into an integrated structure where the cross member, lower reinforcement portion, and upper fixing portion work together as a unified system to protect the battery, reducing the need for separate protective components
4Quantity of substance
If the battery is installed in the rear of the rear seat, then the battery capacity can be increased, but the rear seat movement and propeller shaft operation are restricted
Solution Approach 1:
The battery is positioned along the side of the vehicle in the longitudinal direction, utilizing the lateral dimension rather than the rear space, which allows the rear seat to move freely and the propeller shaft to operate without restriction while still accommodating a large-capacity battery
Data Source
AI summary
A vehicle body structure for a vehicle having a battery and a rear seat includes a battery mounting portion provided on a floor in the rear of the rear seat and on which the battery is mounted, a cross member configured to reinforce the floor in the front of the battery mounting portion, a lower reinforcement portion configured to reinforce the floor below the battery mounting portion and to be supported on the cross member and both side members, and an upper fixing portion fastened to the lower reinforcement portion in a state of fixing the battery. The vehicle body structure is configured to protect the battery by absorbing and distributing the load from a collision, and effectively utilize the space of the rear side of the vehicle for installing the battery with the rear seat, etc.