Predictive Modeling of Creep Driven Pore Growth under Cyclic High Temperature Tooling Loads
Predictive creep modeling quantifies elevated temperature pore evolution in solid state cell tooling to establish precise hold times and prevent yield loss.
Ultrasonic Wave Attenuation
Meaning
Analytical measurement parameter quantifying the loss of energy as an acoustic pulse travels through a material medium. Researchers use ultrasonic wave attenuation as a non invasive method to monitor the state of charge and physical health of a battery. The rate of energy loss changes as the density and elasticity of the electrodes shift during lithiation.
Measurement Technique
Transducers send high frequency sound waves through the cell and record the amplitude of the signal that reaches the receiver. Higher ultrasonic wave attenuation indicates a more porous or degraded internal structure. The measurement takes only a few milliseconds to complete.
Physical Indicators
Gas formation or electrolyte depletion increases the scattering of the acoustic signal. If ultrasonic wave attenuation rises unexpectedly, it suggests that the cell is experiencing internal delamination or the buildup of solid electrolyte interphase layers. The data provides a window into the sealed environment.
Commercial Application
Manufacturers use this data to sort cells into different quality grades during the end of line testing phase. This ultrasonic wave attenuation check identifies units with hidden manufacturing defects that would fail in the field. Integrating these sensors into stationary storage systems allows for real time monitoring of the health of the entire battery array.
The technique offers a faster alternative to traditional discharge cycles for assessing the remaining life of a used battery.