Battery Pack Tuned Mounting for EV Ride Comfort
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Solution Overview
Problem
Electric vehicles face challenges in achieving ride comfort due to the lighter drive motor mass being less effective as a dynamic absorber, leading to increased frame amplitude at ride comfort frequencies.
Innovation Solution
Utilizing the battery pack mass as a dynamic absorber by softly mounting it to the frame with tuned mounts to attenuate low-frequency ride comfort responses, leveraging the existing battery mass without adding additional structure or mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the vehicle uses a lighter electric drive motor instead of a heavy internal combustion engine, then the vehicle weight is reduced and efficiency is improved, but the drive motor mass becomes insufficient to serve as an effective dynamic absorber for ride comfort
Solution Approach 1:
The battery pack serves multiple functions: it provides electrical energy storage for the electric vehicle while simultaneously acting as a dynamic absorber to improve ride comfort. By softly mounting the battery pack to the frame with tuned mounts, its mass is utilized to attenuate frame vibrations in the ride comfort frequency range (5-25 Hz), thereby achieving both propulsion support and vibration mitigation with a single component
Solution Approach 2:
The mounting stiffness parameters of the battery pack are specifically tuned to achieve dynamic absorber functionality. By adjusting the mount stiffness values, the system transforms the battery pack from a rigidly mounted component into a vibration-mitigating element that effectively reduces frame amplitude at ride comfort frequencies
2Stability of the object's composition
If the battery pack is rigidly mounted to the frame, then structural stability is improved, but ride comfort deteriorates due to increased frame amplitude at ride comfort frequencies
Solution Approach 1:
The mounting system employs localized soft mounts at specific battery pack attachment points rather than rigid connections throughout. This allows the battery pack to maintain structural stability while locally introducing vibration isolation characteristics that attenuate frame vibrations in the ride comfort frequency range
Solution Approach 2:
Soft mounting elements are introduced as intermediary components between the battery pack and the vehicle frame. These mounts act as mediators that transmit necessary structural forces while simultaneously filtering out vibrations in the ride comfort frequency range, thus decoupling the structural support function from the vibration transmission
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The battery pack effectively dampens ride comfort responses in the 5-25 Hz frequency range, improving vehicle comfort by splitting dominant peaks into lower amplitude peaks, enhancing overall ride quality.
Implementation Method 1
The present system uses the battery pack mass to improve the ride comfort by dampening response in the ride comfort frequency range. The battery pack therefore acts as a large dynamic absorber for attenuating low frequency ride comfort response.
Implementation Method 2
The battery pack effectively dampens ride comfort responses in the 5-25 Hz frequency range, improving vehicle comfort by splitting dominant peaks into lower amplitude peaks
Data Source
AI summary
A vehicle includes a frame having a natural frequency, a battery and a battery housing having the battery disposed therein. A plurality of mounts is coupled to the battery housing to the frame. The plurality of mounts is tuned to attenuate the response of the frame.