Straddle Electric Vehicle Battery Support Frame Design
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Solution Overview
Problem
The challenge is to design a straddle electric vehicle with a battery system that allows for flexible mounting and reduced weight, while maintaining structural integrity and preventing damage from impact and vibration, as traditional designs face limitations in material selection and stiffness due to the heavy weight of the battery.
Innovation Solution
The vehicle incorporates a battery unit with a separate battery frame for fastening and a battery case that includes a support member below the battery unit, allowing the support frame to bear the weight load, reducing the need for increased stiffness in the battery case, and utilizing reinforcement members and buffer members to absorb impact and mitigate vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery size is increased to achieve continued driving, then the driving range is improved, but the weight increases and requires higher stiffness in the fastening protrusion and battery case bottom wall, which limits flexible design
Solution Approach 1:
The patent divides the battery support system into separate functional components: the fastening protrusion for mounting and the battery case bottom wall for containment. This segmentation allows each component to be optimized independently - the fastening protrusion provides structural support while the bottom wall can be designed with greater flexibility for larger battery sizes without compromising overall structural integrity.
2Strength
If the stiffness of the battery case is increased to support heavy battery weight, then the structural integrity is improved, but the material selection and design flexibility are reduced
Solution Approach 1:
The patent applies local quality by concentrating the stiffness enhancement at specific critical locations - the fastening protrusion and the battery case bottom wall - rather than uniformly increasing the stiffness of the entire battery case. This allows the majority of the battery case structure to maintain design flexibility and material selection freedom while ensuring adequate support for heavy batteries at the load-bearing points.
3Force
If the battery case is designed with higher stiffness to bear battery load, then the load-bearing capacity is improved, but the weight of the battery case increases
Solution Approach 1:
The patent segments the load-bearing function from the containment function. The fastening protrusion and bottom wall are designed to bear the battery load, while the rest of the battery case focuses on containment and protection. This segmentation allows the battery case to achieve adequate load-bearing capacity through targeted reinforcement rather than uniformly increasing wall thickness throughout, thereby reducing overall weight.
4Strength
If the stiffness of the fastening protrusion is increased to support heavy batteries, then the mounting strength is improved, but the vehicle body frame design flexibility is reduced
Solution Approach 1:
The patent applies local quality by enhancing the stiffness of the fastening protrusion at the specific mounting location where battery support is required, while leaving the rest of the vehicle body frame design flexible. This localized reinforcement provides adequate mounting strength for heavy batteries without constraining the overall design flexibility of the vehicle body frame structure.
Data Source
AI summary
A straddle electric vehicle which rotates a drive wheel by driving power generated in an electric motor, comprises a battery unit which is an electric power supply for the electric motor; a vehicle body frame including a support frame for supporting the battery unit; and a battery case storing the battery unit; the battery case includes a support member which is placed below the battery unit and is vertically directly or indirectly in contact with the battery unit; and wherein the support frame supports the battery case and the battery unit in such a manner that the support frame is placed below the battery case to be vertically directly or indirectly in contact with the battery case.