Vehicle Rear Structure Battery Offset for Collision Protection
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Solution Overview
Problem
Existing vehicle rear portion structures compromise luggage compartment usability and battery protection during rear collisions, as the battery is often sandwiched between the hydrogen tank and collision objects, leading to potential deformation and loss of fixation.
Innovation Solution
A vehicle rear portion structure where the battery is positioned on a floor panel outside the rear side members, with a battery clamp and floor panel sandwiching it from above and below, and the hydrogen tank is placed between the side members, offsetting the battery to prevent sandwiching and maintaining its fixation during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is disposed on the luggage compartment rear floor panel above the reinforced region, then battery protection during rear collision is improved, but the main space of the luggage compartment is narrowed and usability is poor
Solution Approach 1:
The patent relocates the battery from a vertical stacking arrangement (above the reinforced floor panel) to a lateral arrangement (on the outer side of the rear side member). This dimensional shift in the vehicle width direction resolves the contradiction by providing battery protection through lateral offset from the hydrogen tank while preserving luggage compartment volume and accessibility.
2Productivity
If the battery is disposed below the deckboard to the rear of the hydrogen tank, then space utilization is improved, but the battery may be sandwiched between the hydrogen tank and collision object during rear collision
Solution Approach 1:
The patent extracts the battery from the conventional position between the hydrogen tank and rear collision structure, and relocates it to the outer side of the rear side member. This separation removes the battery from the potential sandwiching zone, ensuring that even with optimized space utilization, the battery is protected from being compressed between the hydrogen tank and collision objects during rear impact.
3Strength
If the rear side members are locally reinforced by attaching the tank frame, then impact absorption characteristics are improved, but the battery fixation may be compromised when rear side members deform during rear collision
Solution Approach 1:
The patent implements segmentation by providing separate fixation mechanisms: the tank frame with clamp portions for hydrogen tank fixation, and the battery clamp for battery fixation. The battery clamp is specifically designed to maintain battery fixation stability even when the rear side members deform during collision, while the tank frame handles impact absorption for the hydrogen tank. This functional segmentation resolves the contradiction between impact absorption and battery fixation stability.
Data Source
AI summary
In a vehicle rear portion of a vehicle, a third hydrogen tank is disposed between a left and right pair of rear side members that structure portions of the vehicle body and extend in the vehicle front-and-rear direction. An auxiliary battery is disposed at a vehicle width direction outer side of the rear side members.