Analog Tip Impedance Spectroscopy in Practice

Electrochemical impedance spectroscopy (EIS) allows various aspects of a battery cell to be monitored using non-invasive electrical signals: battery temperature, state of charge, power degradation, and thermal outliers. This Analog Tip shows how EIS can help enable significantly more reliable and longer-lasting battery designs.

The advantages of electrochemical impedance spectroscopy (EIS) for monitoring lithium-ion batteries have been described many times. This technique allows for the early detection of an impending thermal runaway, ensuring that the two-hour time window required by the Chinese standard GB 38031-2025—before a fire breaks out or an explosion occurs—can be met.