Battery Cover Cross Member Layout for EV Side-Collision Resistance
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Solution Overview
Problem
Existing vehicle lower part structures, such as those described in Chinese Patent Application Publication No. 114940214, face challenges in ensuring adequate collision resistance performance, particularly in side collisions, due to the need for additional reinforcement components.
Innovation Solution
A vehicle lower part structure that includes a frame-shaped member housing a battery, a battery cover extending in both the front-rear and width directions, and a cross member connecting the frame members and protruding into the vehicle cabin above the battery cover, thereby serving as a floor cross member for reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a separate floor cross member is added to reinforce the vehicle cabin, then collision resistance performance is improved, but device complexity and weight increase
Solution Approach 1:
The patent combines the floor cross member function with the battery cover by having the battery cover extend beyond the battery housing space to form an integrated reinforcement structure. This merging eliminates the need for a separate floor cross member while maintaining collision resistance performance, thus reducing device complexity and weight.
Solution Approach 2:
The battery cover serves dual functions: it covers the battery housing space and simultaneously acts as a floor cross member for reinforcing the vehicle cabin during side collisions. This multi-functionality approach eliminates the need for dedicated reinforcement components, reducing overall structure complexity.
2Strength
If a battery cover is provided on the frame-shaped member, then battery protection is improved, but the need for additional floor reinforcement components arises
Solution Approach 1:
The patent merges the battery cover with the floor reinforcement structure by extending the battery cover beyond the battery housing space to function as a floor cross member. This integration ensures battery protection while simultaneously providing the necessary floor reinforcement, eliminating the need for additional components.
Solution Approach 2:
The battery cover is designed to perform multiple functions: protecting the battery from above and acting as a structural reinforcement member for the vehicle cabin floor. This multi-functional design prevents the need for separate reinforcement components, reducing device complexity.
3Strength
If the cross member protrudes into the vehicle cabin above the battery cover, then floor reinforcement is improved, but headroom space is reduced
Solution Approach 1:
The patent merges the floor reinforcement function with the battery cover by having the battery cover extend to form the reinforcement structure. This integration achieves the necessary floor reinforcement while minimizing protrusion into the vehicle cabin, as the battery cover is positioned above the battery housing space rather than extending deep into the cabin.
Data Source
AI summary
The vehicle lower part structure is formed in a frame shape including a pair of left and right first frames extending in the vehicle longitudinal direction, and a pair of front and rear second frames provided and extending in the vehicle width direction, and a frame-shaped member capable of accommodating a battery inside, a battery cover provided on an upper surface of the frame-shaped member and extending in the vehicle longitudinal direction and the vehicle width direction, and a pair of left and right first frames extending in the vehicle width direction and connecting, and a cross member protruding upward from the battery cover to the vehicle cabin.