Rear Vehicle-Body Structure with Battery Frame for Rear Impact Loads
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Solution Overview
Problem
In electric vehicles, increasing the installation space for batteries to enhance the cruisable distance is hindered by the existing rear side frame configuration, which limits the elongation of battery installation space to the rear and compromises impact load absorption.
Innovation Solution
A rear vehicle-body structure with a rear side frame, rear-side cross member, and side sills that allow the battery casing to extend rearward, using a rear-side battery frame for impact absorption without a load transmission member or fragile portion, thereby increasing battery installation space and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a load transmission member and fragile portion are provided in the bonding portion between the rear side frame and side sill, then impact load absorption is improved, but battery installation space elongation to vehicle rear is hindered
Solution Approach 1:
The patent removes the load transmission member and fragile portion from the bonding portion between the rear side frame and side sill. This extraction eliminates the obstruction to battery installation space elongation while maintaining impact load absorption through an alternative structural design where the rear side frame directly bonds to the side sill without these intermediate components.
Solution Approach 2:
The rear side frame is designed to serve dual functions: it provides structural support for battery installation space elongation while simultaneously absorbing impact loads through its bonding connection to the side sill. This multi-functionality eliminates the need for separate load transmission members, allowing both battery space expansion and impact protection to coexist.
2Volume of moving object
If battery installation space is elongated to vehicle rear, then installed amount of batteries is increased, but load transmission member and fragile portion cannot be provided compromising impact absorption
Solution Approach 1:
The patent extracts the load transmission member and fragile portion from the design, allowing battery installation space to be elongated to the vehicle rear. The impact load absorption function is maintained through the direct bonding connection of the rear side frame to the side sill, which provides sufficient structural integrity without requiring the removed components.
Solution Approach 2:
The patent segments the vehicle body structure into distinct functional zones: the rear side frame and side sill bonding portion handles impact load absorption, while the elongated battery installation space accommodates increased battery capacity. This segmentation allows both functions to be optimized independently within their respective zones.
Data Source
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AI summary
[Problem] An impact load from vehicle rear can be absorbed even in a case where an installation space of batteries is elongated to a vehicle rear side and an installed amount of the batteries is increased. [Means for Solution] A rear vehicle-body structure A includes a rear side frame 90 which extends in a vehicle front-rear direction, a rear-side cross member 95 which is arranged such that a front portion of the rear side frame 90 abuts the rear-side cross member 95 from vehicle rear, the rear-side cross member 95 extending in a vehicle width direction, a pair of left and right side sills 75 which are spaced apart, by predetermined distances, from the front portion of the rear side frame 90 to vehicle-width-direction outer sides and extend in the vehicle front-rear direction, and a rear-side battery frame 33 which extends in the vehicle width direction in the vehicle rear of a battery B and in vehicle front of the rear side frame 90. The rear-side battery frame 33 is mounted on the left and right side sills 75 and on the rear-side cross member 95.