The impedance of the vibrating battery at each stage after cycling is notably higher than that of the fresh battery subjected to direct cycling. This observation suggests that the vibration process has a substantial impact on the internal structure of the battery.
The Rohm of the battery increases following vibration at various frequencies. This phenomenon may be attributed to the collision and deformation of the collector during the vibration process . It is noteworthy that the SEI film impedance and charge transfer impedance of the battery decrease after vibration.
This study investigates the alterations in the electrochemical performance of batteries subjected to vibration at different frequencies and the changes in cyclic batteries after vibration. The degradation mechanism of the battery during vibration and cycling is revealed through electrochemical characterization and post-mortem analysis.
The vibration encountered by batteries during transportation, as well as electric vehicle batteries, modules, and battery packs, is typically generated by demanding road conditions and the internal structure of the vehicle.
Cycle aging of batteries after vibration at different frequencies was performed. Vibration exacerbates degradation during battery cycling. The effect of vibration frequency on battery cycling performance is non-linear. Loss of lithium ions and loss of active material are the main causes of battery aging.
A mechanical vibration model is proposed for a plastic-cased battery. Battery state changes are characterized with the model parameters. A battery mechanical vibration measurement system is constructed. The battery mechanical model has a simple structure and high accuracy.