LITHIUM SECONDARY BATTERY, CONTROL SYSTEM THEREOF, AND STATE DETECTION METHOD OF LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery control system capable of quantitatively detecting a deterioration state specific to a lithium secondary battery that uses a silicon oxide as a negative electrode active material, that is, a non-uniform reaction state of the negative electrode.

SOLUTION: A lithium secondary battery control system provided with a positive electrode, a negative electrode that uses the silicon oxide as the negative electrode active material, and a lithium reference electrode having a reference potential for the negative electrode comprises: measuring means for measuring a voltage V of the negative electrode for the lithium reference electrode and a discharge capacity Q of the lithium secondary battery when the lithium secondary battery is discharged; generation means for generating a V-dQ/dV curve representing the relationship between dQ/dV which is the ratio of a variation dQ of a discharge capacity Q to a variation dV of the voltage V and the voltage V; calculation means for calculating an intensity ratio of two peaks that appear on the V-dQ/dV curve for two voltage values in the voltage V; and detecting means for detecting the negative electrode state using the intensity ratio.

COPYRIGHT: (C)2012,JPO&INPIT