With the global proliferation of electric vehicles (EVs) and energy storage systems (ESS), demand for lithium-ion batteries is growing rapidly. Leading automotive Tier 1 suppliers in the battery industry are beginning to explore the use of EIS2 testing to confirm internal resistance1.

Is it about exploring new measurement methods and making a paradigm shift, or seeking improvements to current measurement approaches? This is a choice that manufacturers pursuing higher-capacity lithium-ion batteries may have to make in the near future.

*2 EIS: Electrochemical Impedance Spectroscopy. EIS is a method that applies an AC voltage to a battery and measures impedance (AC resistance) while sweeping the frequency, thereby enabling detailed analysis of the battery's internal electrochemical characteristics.