Battery Pack Bracket Load Distribution
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Solution Overview
Problem
In battery packs mounted on vehicles, the concentrated load from the vehicle body during a crash can cause stress and damage at the outermost cell fastening portion, leading to potential failure.
Innovation Solution
A battery pack design featuring a support member that distributes the load from the vehicle body to cell fastening portions other than the outermost one, with the support member's case fastening portions located on the inner side of the vehicle relative to the outermost cell fastening portion, reducing stress concentration and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support member is positioned to fasten the battery case to the vehicle body, then the battery case is securely fastened to the vehicle body, but stress concentrates at the outermost cell fastening portion causing damage
Solution Approach 1:
The support member acts as an intermediary element between the battery case and vehicle body. By positioning its case fastening portions on the inner side relative to the outermost cell fastening portion, it creates a load path that distributes stress through multiple fastening points rather than concentrating it at the outermost portion, thus protecting the battery case structure
2Device complexity
If the case fastening portions are positioned on the outer side relative to the outermost cell fastening portion, then the support structure is simplified, but load transmission causes stress concentration at the outermost cell fastening portion
Solution Approach 1:
Instead of positioning the support member's case fastening portions on the outer side (conventional approach), the invention inverts the positioning to the inner side relative to the outermost cell fastening portion. This inverted configuration reverses the load transmission path, allowing the support member to distribute loads away from the vulnerable outermost portion while maintaining structural simplicity
Data Source
AI summary
A battery pack includes a lower case having a plurality of cell fastening portions fastened to a plurality of cells, respectively, and a bracket to support the lower case to a floor panel of a vehicle. The bracket has a plurality of case fastening portions fastened to the lower case, and a body fastening portion to be fastened to the floor panel. The body fastening portion is disposed on the outer side of the vehicle relative to an outermost cell fastening portion disposed on the outermost side of the vehicle of the plurality of cell fastening portions. The case fastening portions are disposed on the inner side of the vehicle relative to the outermost cell fastening portion.