Battery Pack Floor Integration With Rear Subframe Space Constraint
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Solution Overview
Problem
In new energy vehicles, the limited space beneath the vehicle body for battery packs due to structural constraints affects the vehicle's endurance and moving ability, as well as passenger compartment height and safety.
Innovation Solution
The vehicle design incorporates a rear subframe with a limiting surface for the battery pack to extend backward, allowing it to serve as a force transmission structure, and integrates the battery pack's upper surface as part of the vehicle floor, enhancing space utilization and safety performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery pack is mounted below the vehicle body floor in conventional positions, then the vehicle structure is simple, but the available space for the battery pack is small and a large gap is formed between the battery pack and the floor
Solution Approach 1:
The battery pack upper surface is merged with the vehicle body floor structure, eliminating the gap between the battery pack and floor. The battery pack serves dual functions as both energy storage device and structural floor component, integrating two separate elements into one unified structure that maximizes space utilization.
Solution Approach 2:
The battery pack is designed to perform multiple functions: it serves as the energy storage device for the new energy vehicle and simultaneously functions as part of the vehicle body floor structure. This multi-functionality allows the battery pack to contribute to both propulsion and structural integrity, eliminating wasted space.
2Duration of action of moving object
If the battery pack size is increased to improve endurance, then the vehicle endurance is improved, but the vehicle height increases and moving ability deteriorates
Solution Approach 1:
Instead of increasing battery pack capacity solely in the vertical dimension (which increases vehicle height), the battery pack is positioned to extend in the longitudinal direction along the vehicle's length. This dimensional redistribution allows for increased energy storage capacity without compromising vehicle height or ground clearance.
3Volume of moving object
If the battery pack is positioned to maximize space utilization, then space utilization is improved, but the force transmission capability and safety performance are compromised
Solution Approach 1:
The battery pack is designed to serve dual purposes: as the energy storage device and as a force transmission structure. By integrating the battery pack with the vehicle body floor and rear subframe, it becomes part of the load-bearing and collision force transmission path, eliminating the need for separate structural components.
4Speed
If the gap between the battery pack and vehicle body floor is reduced to improve moving ability, then the vehicle moving ability is improved, but the battery pack capacity is limited
Solution Approach 1:
The battery pack upper surface is merged with the vehicle body floor, eliminating the gap entirely. This integration allows the battery pack to extend to the rearmost position of the vehicle body, maximizing its longitudinal dimension and capacity while maintaining optimal vehicle moving ability.
Data Source
AI summary
A vehicle includes an underbody, a rear subframe, and a battery pack. The rear subframe is connected to the underbody. The battery pack is connected to the underbody and is disposed on a lower side of the underbody. A front end surface of the rear subframe includes a limiting surface for the battery pack to extend backward, and at least a part of an upper surface of the battery pack forms a portion of at least a portion of a floor of a vehicle body.