EV Battery Module Mounting Rigidity for Road Noise Suppression
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Solution Overview
Problem
Existing battery mounting structures in electric vehicles face challenges in reducing traveling noises while maintaining compactness, as the resonance of battery modules with the vehicle-body vibration can amplify noise in the middle-frequency band, particularly affecting road-noise performance.
Innovation Solution
The battery unit is designed with a configuration of right-and-left side frames and cross frames, where battery modules are arranged in multiple rows with varying mounting rigidity, including different mounting brackets to differentiate natural frequencies, thereby suppressing resonance and vehicle-body vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If battery modules are arranged in multiple rows at the same position with uniform mounting, then the battery unit achieves compactness, but the modules resonate with vehicle-body vibration at middle-frequency band (100-400Hz) deteriorating road-noise performance
Solution Approach 1:
The patent applies local quality by differentiating the mounting rigidity of battery modules based on their position. Specifically, battery modules in odd-numbered rows are mounted with different rigidity compared to those in even-numbered rows. This creates local variations in mounting characteristics across the uniform battery module array, causing each row to have distinct natural frequencies that avoid resonance with vehicle-body vibration in the middle-frequency band, thereby reducing road noise while maintaining compact arrangement.
2Ease of manufacture
If battery modules are mounted with uniform rigidity to simplify structure, then manufacturing is easier, but all modules resonate together amplifying vehicle-body vibration
Solution Approach 1:
The patent applies segmentation by dividing the battery modules into distinct groups based on their row positions. Battery modules in odd-numbered rows are segmented from those in even-numbered rows, with each group having different mounting rigidity characteristics. This segmentation prevents uniform resonance across all modules while maintaining relatively simple mounting structures within each group, thus reducing vibration amplification without overly complicating manufacturing.
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
This configuration effectively reduces resonance and noise levels by varying the mounting rigidity of battery modules, enhancing the compactness and noise suppression performance of the battery unit.
Implementation Method 1
since each of the battery modules has substantially the same natural frequency, all of these battery modules so resonate with vehicle-body vibration at a specified frequency band that the vehicle-body vibration may be improperly amplified
Implementation Method 2
Vibration energy caused by a wheel running on a road surface is transmitted to a vehicle-body strength member through a suspension member and then vibrates a panel member
Data Source
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AI summary
A battery unit 10 comprises side frames 21, cross frames 31 - 33, and plural battery modules 11 having substantially the same size comprising a longitudinal dimension, a lateral dimension, and a height dimension. The battery modules 11 are respectively mounted at the cross frames 31 - 33 in the same position and arranged in plural rows adjacently to a vehicle width direction such that a direction of the above-described longitudinal dimension is substantially parallel to a vehicle longitudinal direction, and mounting rigidity of the battery modules 11 stored in a first storage area S1 is set to be different from that of the battery modules 11 stored in second and third storage areas S2, S3.