Ductile Fasteners Prevent Battery Frame Cracking in Vehicles
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Solution Overview
Problem
The existing battery mounting structure for vehicles, which uses a fiber reinforced resin battery frame, is prone to cracking during collisions, leading to the potential fall-off of the driving battery due to insufficient load resistance.
Innovation Solution
A battery mounting structure that incorporates a ductile member over first and second fastening portions to secure the battery frame to the vehicle body and the battery to the frame, respectively, ensuring stability even if a crack occurs, while being configured to minimize weight and cost increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a fiber reinforced resin battery frame is used to support the battery, then the battery frame can be lightweight and have good corrosion resistance, but the battery frame may crack when collision load is input, causing the battery to fall off
Solution Approach 1:
The battery frame uses fiber reinforced resin material combining metal fibers (steel or aluminum) with resin matrix to create a composite structure that maintains lightweight properties while significantly improving collision resistance and preventing crack propagation
Solution Approach 2:
Fastening portions made of ductile material (steel or aluminum) are introduced as intermediary components between the fiber reinforced resin battery frame and the vehicle body/battery, serving as load-bearing elements that prevent crack propagation and maintain reliability under collision loads
2Reliability
If ductile members are provided over the first and second fastening portions to prevent battery fall-off, then the reliability under collision load improves, but the weight and manufacturing cost increase
Solution Approach 1:
The fastening portions are designed with optimized geometric parameters (cross-sectional area, shape, distribution) to achieve the minimum necessary ductile material volume that provides adequate collision resistance while minimizing weight addition
Solution Approach 2:
The fastening portions serve multiple functions simultaneously: mechanical fastening of the battery frame to the vehicle body and the battery to the battery frame, and providing ductile load-bearing capacity during collision, eliminating the need for separate reinforcement components
Data Source
AI summary
A battery mounting structure for a vehicle includes: a battery frame made of fiber reinforced resin and fastened and fixed to a vehicle body via a plurality of first fastening portions; a battery fastened and fixed to the battery frame via a plurality of second fastening portions; and a ductile member provided between the first fastening portion and the second fastening portion.