| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery state detector capable of accurately detecting a secondary battery state relatively easily.SOLUTION: In a battery state detector 1, a μCOM 40 detects a plurality of internal complex impedances z1, z2, and z3 corresponding to a plurality of discrete detection frequencies f1, f2, and f3 of a secondary battery B, respectively, and detects an SOH of the secondary battery B on the basis of these detected internal complex impedances z1, z2, and z3. The frequencies f1, f2, and f3 corresponding to the respective internal complex impedances z1, z2, and z3 detected by the μCOM 40 are distributed into two partial frequency ranges corresponding to a plurality of partial graphs K1 and K2, respectively, indicating states of a plurality of constituent elements of the secondary battery B, of a graph K formed by plotting internal complex impedances over a predetermined frequency range of the secondary battery B on a complex plane. |
