Tapered Battery Pack Mounting Between Coil Springs
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Solution Overview
Problem
Existing vehicle mounting structures for battery packs in electric and hybrid vehicles face challenges in securing a large shock-absorbing space during crashes while minimizing vibrations, particularly due to the constraints imposed by coil springs, which limit installation positions and create narrow, low-rigidity areas that increase floor panel vibrations.
Innovation Solution
A vehicle mounting structure featuring a tapered opening shape in the floor panel and a corresponding tapered battery pack shape, positioned between coil springs, with sub-frames for enhanced support and vibration suppression, allowing for a larger separation distance from exterior members and reducing floor panel vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack is installed between the coil springs to secure shock absorbing space, then the shock absorbing space is improved, but the floor panel rigidity deteriorates causing increased vibrations
Solution Approach 1:
The battery pack is designed with a tapered shape that is narrower at the front portion and wider at the rear portion. This local variation in geometry allows the battery pack to be positioned optimally between the coil springs, creating narrow spaces at the front that reduce floor panel vibrations while maintaining adequate shock absorbing space at the rear
Solution Approach 2:
The invention transitions from considering only the longitudinal dimension (front-rear space) to incorporating the transverse dimension (width) by positioning the battery pack between the coil springs. This spatial arrangement creates a three-dimensional optimization where the tapered shape accommodates both the shock absorbing requirement and the vibration suppression requirement
2Stability of the object's composition
If the battery pack is installed on the rear side of the coil springs to avoid vibrations, then the floor panel rigidity is improved, but the shock absorbing space deteriorates
Solution Approach 1:
The tapered shape of the battery pack creates different local characteristics: the narrow front portion is positioned near the coil springs to minimize vibration transmission, while the wider rear portion is positioned away from the coil springs to maximize shock absorbing space. This local differentiation resolves the contradiction between rigidity and shock absorption
3Quantity of substance
If the battery pack is made large in capacity, then the electric power storage is improved, but the installation position options deteriorate due to space constraints
Solution Approach 1:
The invention utilizes the transverse dimension (width) by positioning the battery pack between the coil springs, rather than only using the longitudinal dimension. This allows a large capacity battery pack to be installed without extending excessively in the front-rear direction, thereby maintaining installation flexibility and avoiding conflicts with exterior members
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
This configuration effectively secures a large shock-absorbing space between the battery pack and vehicle exterior members, while minimizing vibrations by utilizing the space between coil springs and providing a stronger, more stable installation through sub-frames, thus enhancing crash absorption and reducing chatter sounds.
Implementation Method 1
a pair of left and right coil springs functioning as suspensions by being directly or indirectly linked with said framework members
Implementation Method 2
a pair of left and right coil springs functioning as suspensions
Implementation Method 3
an opening shape of said opening and an outer shape of said battery pack that coincide with an extended plane of said floor panel between said coil springs are formed to be a tapered shape that becomes narrower as it enters deeper into a space between said coil springs
Data Source
AI summary
A vehicle battery pack mounting structure that suppresses vibrations of a floor panel while making a shock absorbing space between the battery pack and vehicle exterior members large by effectively utilizing a space between coil springs. The battery pack mounting structure includes a pair of left and right side members and a cross member for supporting the battery pack. A pair of left and right coil springs is installed at these side members and function as suspension members. The battery pack is installed inside an opening of a floor panel between the coil springs, and also between the coil springs, a front portion of the battery pack has a tapered outer surface that becomes narrower as it enters deeper into a space between the coil springs. The opening of the floor panel also has a tapered edge shape.