Vehicular Battery Unit Layout With Driveshaft Mounting Space
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Solution Overview
Problem
Existing vehicular battery mounting configurations face challenges in optimizing space utilization, particularly in electric vehicles, where high-voltage battery units mounted under the center floor compromise space for components like spare tires and driveshafts, limiting power transmission efficiency and all-wheel drive capabilities.
Innovation Solution
A vehicular battery unit design featuring a lower case with bent connecting sections and cross members that create a mounting space for the driveshaft, allowing power transmission to rear wheels without additional motors, while incorporating a rigidity-reinforcing structure to manage impacts and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the high-voltage battery unit is mounted to a lower portion of a center floor of a vehicle, then space utilization in the trunk compartment or luggage compartment is optimized, but space for disposing a driveshaft is reduced
Solution Approach 1:
The lower case is divided into a pair of battery-receiving sections disposed at two lateral sides of the vehicle and a connecting section between them. The connecting section is bent convex upwards to create a mounting space for the driveshaft, while the battery-receiving sections accommodate battery modules. This segmentation allows both battery storage and driveshaft accommodation in the same underfloor region.
Solution Approach 2:
The connecting section of the lower case is bent in a convex upward shape, utilizing the vertical dimension to create a mounting space for the driveshaft. This dimensional transformation allows the driveshaft to be disposed in the space between the battery-receiving sections without compromising battery capacity or trunk space.
2Volume of moving object
If the high-voltage battery unit is mounted in a trunk compartment or luggage compartment, then space for battery storage is provided, but space for mounting components such as spare tire is reduced
Solution Approach 1:
The battery unit is extracted from the trunk compartment or luggage compartment and mounted externally to the lower portion of the center floor. This extraction frees up the trunk space for other components such as spare tires, while the battery modules are accommodated in the dedicated battery-receiving sections of the lower case.
3Adaptability or versatility
If a rear-wheel-driving motor is additionally mounted to realize all-wheel drive, then all-wheel drive capability is achieved, but vehicle complexity and weight increase
Solution Approach 1:
The connecting section of the lower case serves multiple functions: it structurally connects the two battery-receiving sections, provides a mounting space for the driveshaft, and reinforces the underbody structure. This multi-functionality eliminates the need for additional rear-wheel-driving motors, achieving all-wheel drive capability through the existing powertrain configuration.
Data Source
AI summary
A vehicular battery unit includes a lower case, including a pair of battery-receiving sections disposed at two lateral sides of a vehicle, and a connecting section, which is disposed between the pair of battery-receiving sections and is convex upwards, battery modules mounted in the battery-receiving sections, a lower cross member, which is fixed to a lower surface of the lower case and extends beyond the lower surface of the lower case in a lateral direction of the lower case, the lower cross member being bent upwards beyond the lower surface of the lower case and bent in the lateral direction of the lower case, and an upper cross member, which is fixed to a lateral side surface of the lower case, is bent in the lateral direction of the lower case, and is coupled to the lower cross member.