| 摘要 |
PROBLEM TO BE SOLVED: To provide an impedance detection circuit, along with a battery power supply apparatus and battery utilization system, capable of measuring the impedance of a secondary battery without being provided with an AC power supply circuit. SOLUTION: The impedance detection circuit includes: a peak current value detection unit 41 for detecting a peak value of a current, as a peak current value, detected by a current detection unit 3; a peak voltage value detection unit 42 for detecting a peak value of a terminal voltage, as a peak voltage value, detected by a voltage detection unit 2; a lag time detection unit 43 for detecting lag time in changes of a terminal voltage to changes in a current value; a period detection unit 44 for detecting one period in the process of changes of either the current value or the terminal voltage through the use of either one; and an impedance estimation unit 5 for estimating the impedance of a lithium ion secondary battery B on the basis of the peak current value; the peak voltage value; the lag time; and the period. COPYRIGHT: (C)2011,JPO&INPIT |
