Battery Side Frame with Closed Cross-Section for Impact Load Distribution
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Solution Overview
Problem
The existing vehicle body lower structure configurations face challenges in stabilizing the battery pack during side impacts, as the length of the battery side frame's fixing points to the side sills increases the risk of detachment under impact loads, and the integral fixing of side sills to the battery pack complicates manufacturing.
Innovation Solution
A vehicle body lower structure design featuring a battery side frame with a first attachment member fixed to the side sills and a second attachment member forming a closed cross-section with the battery pack, reducing the length of the attachment member and enhancing structural strength, including an extended installation section and overlapping plates for increased fixation strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery side frame is formed separately from the battery pack to facilitate manufacturing, then the ease of manufacture is improved, but the length from the fixing points increases, causing larger detachment loads under impact
Solution Approach 1:
The battery side frame is divided into a first attachment member (fixed to side sills) and a second attachment member (fixed to battery pack), allowing separate manufacturing while maintaining structural integrity. This segmentation enables modular production without compromising the overall strength of the connection system.
2Adaptability or versatility
If the first attachment member has a longer length to span between side sills and battery pack, then the adaptability is improved, but the moment of force under impact load increases, causing detachment risk
Solution Approach 1:
The second attachment member acts as an intermediary element that forms a closed cross-section structure, providing additional structural support and reducing the moment of force on the first attachment member. This intermediary structure distributes and reduces the mechanical stress under impact conditions.
Data Source
AI summary
A vehicle body lower structure includes a battery pack, side sills, and a battery side frame that extends in a forward/rearward direction between the side sills and the battery pack and that is configured to support the battery pack, the battery side frame has a first attachment member fixed to the side sills, and a second attachment member that is coupled to the battery pack and that constitutes a closed cross section between the first attachment member and the battery pack, and the first attachment member has an outer fixing point fixed to the side sills and an inner fixing point fixed to a wall that constitutes a closed cross section of the second attachment member.