Underbody Battery Pack Layout for Stable EV Battery Swapping
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Solution Overview
Problem
The existing battery packs for electric vehicles are installed above the longitudinal beam, leading to a high center of gravity and poor stability, requiring large battery swapping stations with high construction costs and difficulty.
Innovation Solution
A battery pack design where the pack is installed below the vehicle body longitudinal beam using a locking shaft and mounting plate system, allowing for a lower center of gravity, reduced space occupation, and enabling bottom-access battery swapping without the need for sunken spaces or lifting, thus simplifying station construction and improving swapping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery pack is installed above the longitudinal beam, then the battery pack is easily accessible, but the center of gravity of the electric vehicle becomes high resulting in poor driving stability
Solution Approach 1:
The battery pack is inverted from the conventional upper installation position to a lower position, specifically installed below the longitudinal beam of the vehicle body. This inversion of the installation location lowers the center of gravity, thereby improving driving stability while maintaining accessibility through the locking shaft mechanism
2Ease of manufacture
If the battery pack is installed above the longitudinal beam, then the installation structure is simple, but the battery swapping station requires large site area and hoisting tools resulting in high construction cost
Solution Approach 1:
The battery pack installation position is inverted to below the longitudinal beam, which fundamentally changes the battery swapping approach. The swapping device can now access the battery from underneath the vehicle, eliminating the need for large sunken spaces or hoisting equipment, thereby reducing station construction cost and site area requirements
Solution Approach 2:
The heavy lifting and hoisting functions are extracted from the battery swapping process. By positioning the battery pack below the longitudinal beam with external locking shafts, the system eliminates the need for complex hoisting tools and large sunken spaces, simplifying the swapping station infrastructure
3Adaptability or versatility
If the battery pack is installed above the longitudinal beam, then the battery pack structure is conventional, but the thickness of the battery pack becomes large occupying space behind the driver
Solution Approach 1:
The battery pack installation is inverted from above to below the longitudinal beam, which fundamentally changes the spatial arrangement. This inversion allows the battery pack to be positioned in the space beneath the vehicle body, eliminating the need for thick battery packs that would occupy cargo space behind the driver
Data Source
AI summary
Disclosed in the present invention are a battery pack for an electric vehicle, and an electric vehicle comprising the battery pack. The battery pack for an electric vehicle is mounted on a vehicle body longitudinal beam of the electric vehicle, and comprises: a box body comprising at least two box body units, battery modules for externally charging and discharging being arranged in the box body units; and locking shafts provided horizontally, arranged on the upper part between two adjacent box body units, and corresponding to the position of a locking mechanism on the longitudinal beam. As for an electric vehicle, the center of gravity can be reduced, the driving stability is improved, and the height space below the vehicle can be fully utilized, so that a battery swapping device can conduct battery swapping easily, the station building cost, time and difficulty of a battery swapping station are reduced.