Battery Pack Mounting Structure With Offset Modules
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Solution Overview
Problem
In electric vehicles, mounting a large-sized battery pack behind the rear seat is challenging due to limited space and rigidity concerns, which restricts battery capacity and maintenance accessibility.
Innovation Solution
A battery pack mounting structure with a floor panel opening for the upper part of the pack, allowing stacked battery modules with varying longitudinal dimensions and offset front ends, enabling increased module count without compromising vehicle rigidity, and facilitating easy attachment and detachment from below.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large-sized battery pack is mounted in the vehicle interior to increase battery capacity, then the battery capacity is improved, but it becomes difficult to attach and detach the battery pack for maintenance
Solution Approach 1:
The battery pack is divided into multiple battery modules that are stacked in the height direction. This segmentation allows the battery pack to be mounted in a compact configuration behind the rear seat while maintaining accessibility for maintenance operations.
Solution Approach 2:
The patent utilizes the height direction (vertical dimension) to arrange battery modules stacked on top of each other. This dimensional approach increases battery capacity without requiring additional longitudinal or lateral space, enabling the battery pack to fit behind the rear seat while remaining serviceable.
2Quantity of substance
If the frame of the vehicle body is partially cut out to make space for mounting a large-sized battery pack, then the battery capacity is improved, but the rigidity of the vehicle body is lowered
Solution Approach 1:
The battery modules are arranged in the height direction rather than requiring longitudinal or lateral modifications to the vehicle frame. This vertical stacking approach eliminates the need to cut out the vehicle frame, thereby preserving vehicle body rigidity while still accommodating increased battery capacity.
Solution Approach 2:
The battery pack is segmented into multiple modules stacked vertically, allowing compact integration into the available space behind the rear seat without requiring frame modifications. This segmentation enables high battery capacity within constrained spatial parameters.
3Reliability
If a shock absorption space is made behind the battery pack, then safety is improved, but the battery capacity is reduced due to limited space
Solution Approach 1:
By utilizing the height direction for battery module stacking, the patent maximizes battery capacity within the available longitudinal and lateral space behind the rear seat. This dimensional approach allows sufficient space to be allocated for shock absorption requirements without compromising battery capacity.
Solution Approach 2:
The battery modules are designed with varying longitudinal dimensions and offset front ends, creating a dynamic configuration that optimizes space utilization. This allows the battery pack to accommodate both high capacity requirements and shock absorption space within the constrained volume behind the rear seat.
4Quantity of substance
If the number of battery modules is increased to enhance battery capacity, then the battery capacity is improved, but the rigidity of the rear part of the vehicle is lowered
Solution Approach 1:
The patent increases battery capacity by stacking modules in the height direction rather than expanding in the longitudinal direction. This vertical arrangement behind the rear seat avoids compromising the rigidity of the rear vehicle structure while accommodating multiple battery modules.
Solution Approach 2:
The battery modules are designed with asymmetric configurations, where upper modules have smaller longitudinal dimensions and offset front ends compared to lower modules. This asymmetric arrangement optimizes space utilization and maintains structural integrity of the rear vehicle portion.
Data Source
AI summary
There is provided a battery pack mounting structure for an electric vehicle. A battery pack is mounted in a space behind a rear seat of the electric vehicle. Battery modules are accommodated in the battery back are in a stacked state in a height direction of the electric vehicle. A floor panel behind the rear seat is formed with an opening into which an upper part of the battery pack is inserted. When seen from a side of the electric vehicle, a dimension of one battery module disposed at a position protruding upwards from the opening, is smaller in the longitudinal direction than that of another battery module disposed below the one battery module, and a front end portion of the one battery module is offset towards a rear side of the electric vehicle relative to that of the another battery module.