This work aims to take a deeper look at the feasibility of using pulses to estimate the impedance spectrum of a battery module, which consists of several battery cells in series. Regarding the existing literature, there are two main aspects we wanted to explore. One is to have high speed voltage and current measurements with a good resolution in order to see if we can estimate high frequency impedances well enough, which is often ignored due to hardware limitations in the measurement setup. The other is to investigate pulse and normal EIS measurements on a battery module level and to be able to compare both of them to each other.
The first results suggest that useful information can be gained from pulse EIS with a trade-off of lower signal quality depending on the contained excitation frequencies inside the pulse, which was to be expected.