Non-Invasive Battery condition testing using electrical signals and Oscilloscopes

Abstract:
Electrochemical Impedance Spectroscopy (EIS) is a powerful method for analyzing the electrochemical behavior of rechargeable batteries. By measuring the impedance response of a battery to an applied AC signal, EIS can provide valuable insights into the battery's charge and discharge characteristics, as well as its internal resistance and capacitance. To perform EIS measurements, an oscilloscope and signal generator are typically used to apply and measure the AC signal, while a specialized software is employed to analyze the resulting impedance data. EIS is better method to other techniques commonly used in battery research, such as Open Circuit Voltage (OCV) and Accelerated Internal Resistance (AICR) measurements. OCV is a simple method that measures the voltage of a battery when it is not supplying any current. However, OCV provide limited information about the battery's internal behavior and cannot reveal changes in its electrochemical properties over time. AICR measurements can be damaging to the battery and may not accurately represent its real-world behavior. Designers want to observe voltage and current waveforms coming out of the battery, in a continuous mode. This paper talks about EIS using Oscilloscopes and Generator and post processing techniques.