公开(公告)号：US20180321326A1

公开(公告)日：2018-11-08

申请号：US15739566

申请日：2016-06-24

Applicant: Japan Aerospace Exploration Agency

Inventor： Kohei TANAKA ,  Yoshitsugu SONE ,  Seisuke FUKUDA ,  Masayuki ITAGAKI

IPC: G01R31/36 ,  H01M10/42

Abstract: It is intended to recognize the state of charge or depth of discharge of the battery more accurately than conventional technologies and to recognize health of a battery appropriately. Complex impedance between positive and negative electrodes of the battery is determined at a plurality of frequencies, and the state of charge or depth of discharge of the battery is estimated by comparing frequency dependency of Warburg impedance of the determined complex impedances with frequency dependency of Warburg impedance corresponding to a known state of charge or depth of discharge of the battery. Similarly, complex impedance is determined, and the health of the battery is evaluated by using the real part of the complex impedance at a point where the imaginary part of the complex impedance is zero on a line obtained by extending a part, which indicates frequency dependency of Warburg impedance, of a complex impedance characteristic curve representing a correlation relationship between the real and imaginary parts of the determined complex impedance.