Battery Pack Elastic Coupling Resonance Control
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Solution Overview
Problem
Secondary battery packs used in electric vehicles and similar applications are prone to performance degradation and reduced lifespan due to vibrations, which cause simultaneous resonance of battery modules at specific frequencies, leading to physical damage.
Innovation Solution
A battery pack design featuring multiple battery modules stacked with elastic coupling members having different elastic coefficients, connecting each module to others and a frame, preventing simultaneous resonance by ensuring unique resonant frequencies for each module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If elastic coupling members with similar elastic coefficients are used to connect battery modules, then the battery modules can be securely coupled together, but the battery modules may resonate simultaneously due to vibrations at a certain frequency
Solution Approach 1:
The patent applies local quality by assigning different elastic coefficients to different coupling members. Specifically, coupling members connecting battery modules to the frame have different elastic coefficients from those connecting battery modules to each other. This creates localized variations in mechanical properties that prevent uniform resonance across all modules while maintaining secure coupling at each connection point.
Solution Approach 2:
The patent changes the elastic coefficient parameter of the coupling members to prevent simultaneous resonance. By selecting coupling members with different elastic coefficients (different stiffness values), the natural frequencies of different battery modules are dispersed, preventing them from resonating at the same frequency when subjected to external vibrations.
2Stability of the object's composition
If battery modules are fixedly coupled together, then structural stability is improved, but performance degradation and reduced lifespan occur due to vibration-induced physical damage
Solution Approach 1:
The patent changes the elastic parameter of the coupling members from rigid (fixed) to elastic (flexible). By using coupling members with appropriate elastic coefficients, the system maintains structural stability while allowing individual battery modules to move independently in response to vibrations, preventing the transmission of harmful vibrational forces that would cause physical damage.
Solution Approach 2:
The elastic coupling members act as beforehand cushioning elements that absorb and dampen vibration energy before it can propagate through the battery pack structure. The elastic deformation of these coupling members during vibration cycles protects the battery modules from direct mechanical stress, extending the overall system lifespan.
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
Prevents severe vibration and performance degradation by ensuring each battery module has a distinct resonant frequency, thereby extending the lifespan of the battery pack.
Implementation Method 1
a plurality of elastic coupling members for elastically connecting at least one battery module to another battery module or for elastically connecting at least one of the battery modules to the frame
Implementation Method 2
when elastic coefficients of the coupling members coupled to the battery modules are similar to each other, the battery modules may have similar natural resonant frequencies. Thus, the battery modules may be simultaneously resonated due to vibrations at a certain frequency
Data Source
AI summary
A battery pack including a plurality of battery modules, each battery module including a plurality of stacked unit battery cells; a frame supporting the plurality of battery modules; and a plurality of elastic coupling members for elastically connecting at least one battery module to another battery module or for elastically connecting at least one of the battery modules to the frame; wherein elastic coupling members connected to one of the battery modules have a different elastic coefficient from elastic coupling members connected to the other battery module.