Battery Floor Housing Layout for Side-Impact Intrusion Resistance
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Solution Overview
Problem
Existing energy storage unit floor structures in electrically drivable motor vehicles are prone to deformation and cell intrusion during side impacts, with screw connections and sealing elements increasing the risk of damage to the storage unit housing.
Innovation Solution
The fixing plane and sealing plane are separated and arranged at a distance from each other, with the fixing plane positioned outside the transverse load path, reducing the size of the connection between the storage unit housing and the floor structure, and incorporating mechanical connectors like screw connections that are offset to overlap the side skirt, enhancing deformation without intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fixing plane and sealing plane are arranged in a common plane (congruent), then the connection structure is compact and simple, but the screw connections are prone to forming blocks and the storage unit housing is vulnerable to deformation and cell intrusion during side impacts
Solution Approach 1:
The patent separates the fixing plane and sealing plane in the longitudinal direction, creating a spatial distance between them. This dimensional separation allows the screw connections to be positioned outside the transverse load path during side impacts, preventing force transmission to the sealing element and storage unit housing, thereby resolving the contradiction between structural compactness and impact protection
2Ease of manufacture
If the sealing element is arranged on the inner side of the screw connections in the common fixing plane, then the sealing connection is integrated, but the flange connection and angled part must extend considerably in the transverse direction, increasing the risk of cell intrusions
Solution Approach 1:
The patent segments the sealing element into multiple sections along the longitudinal direction, with different sections positioned at different longitudinal positions relative to the screw connections. This segmentation allows the sealing function to be maintained while preventing the sealing element from being located in the force transmission path during side impacts, thereby reducing cell intrusion risk
Data Source
AI summary
An energy store floor structure for an electrically drivable motor vehicle, includes: a floor structure which has associated longitudinal and transverse members; and an electrical energy store device which has a store housing disposed on the underside of the floor structure. The store housing is connected to the associated longitudinal or transverse member of the floor structure at least in a length region along a fastening plane by way of mechanical connectors and is sealed against the corresponding longitudinal or transverse member of the floor structure at least in the length region along a sealing plane by way of a seal. In order to create an energy store floor structure in which the store housing is protected against excessive deformation and cell intrusions, the fastening plane and the sealing plane are mutually spaced apart in the corresponding length region.