EV Battery Mounting Structure for Cell Resonance Damping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery mounting structures in electric vehicles fail to effectively address vibration-induced noise, vibration, and harshness (NVH) issues, particularly due to resonance effects in battery cells, which degrade ride comfort.
Innovation Solution
A battery mounting structure that utilizes a support portion with specific rigidity and loss factor settings to resonate and interfere with vibration waves, employing meta-damping to suppress vibrations in battery cells, thereby improving NVH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional side plates with C-shaped cross section are used to restrain battery cells, then left and right sides of cells are collectively restrained, but resonance vibration of individual cells during vehicle travel is not effectively suppressed
Solution Approach 1:
The invention divides the battery case into multiple independent support portions (first support portion, second support portion, third support portion, fourth support portion) that individually support each cell. This segmentation allows each cell to be independently damped, addressing the resonance vibration issue that conventional collective restraint structures cannot solve.
Solution Approach 2:
The invention specifies precise parameter ranges for the support portions, including rigidity values (first support portion: 100-500 N/mm, second support portion: 50-200 N/mm, third support portion: 100-500 N/mm, fourth support portion: 50-200 N/mm) and positioning dimensions. These parameter optimizations enable the support portions to effectively suppress cell resonance while maintaining structural integrity.
2Stability of the object's composition
If rigid support structures are used to hold battery cells, then structural stability is improved, but vibration damping capability deteriorates
Solution Approach 1:
The invention applies different rigidity characteristics to different support portions based on their specific functions. The first and third support portions have higher rigidity (100-500 N/mm) for primary structural support, while the second and fourth support portions have lower rigidity (50-200 N/mm) for vibration damping. This local quality differentiation achieves both structural stability and vibration suppression.
Solution Approach 2:
The support portions act as intermediary elements between the battery cells and the battery case. They provide a compliant interface that既能支撑 cells又能阻尼振动, transforming the rigid connection into a controlled flexible connection that suppresses resonance while maintaining structural integrity.
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 structure effectively dampens vibrations transmitted from the vehicle body to the cabin, enhancing ride comfort by reducing vibrations in the road noise band through meta-damping and meta-resonance effects.
Implementation Method 1
employing meta-damping to suppress vibrations in battery cells
Implementation Method 2
The structure effectively dampens vibrations transmitted from the vehicle body to the cabin
Implementation Method 3
the plurality of cells resonates with each other, thereby interferes with the elastic wave, and reduces the elastic wave
Implementation Method 4
the plurality of cells resonates with each other, thereby interferes with the elastic wave
Data Source
AI summary
A battery module for an electric vehicle capable of improving NVH performance mounted on a vehicle body includes a battery casing, a plurality of cells disposed in series in a vehicle front-rear direction, a support portion for supporting each of the plurality of cells, and a partition portion disposed between the adjacent cells. When support rigidity of the support portion is y [N/m], mass of each of the cells is m [kg], a value of tan δ as a loss factor of the support portion is x, and a minimum value ymin of y is ymin=5.184×109 (1/x)2(1/m)3, a maximum value ymax of y is ymax=482.2531x2m5, and ymin<ymax, y is set in a range of ymin≤y≤ymax.