A Uniformity Sorting Strategy for Lithium-Ion Batteries Based on Impedance Spectroscopy

In the context of the energy revolution, the research and application of energy storage technology have been paid more and more attention. As one of the main energy storage devices, lithium-ion batteries are usually put into use in the form of battery packs in practice. Due to the inconsistency between battery cells, the battery pack cannot play the best performance. Moreover, there is a lack of sorting means in the recycling of battery cells. To solve this problem, a battery uniformity sorting method based on electrochemical impedance spectroscopy is presented. Seventy commercial batteries of the same type were sorted and grouped by this strategy. The capacity decay of the battery pack before and after sorting and the dispersion degree of the battery voltage curve were tested. It is proved that this method can achieve fast and effective sorting of batteries and has practical application prospects.