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    • 5. 发明专利
    • Lithium secondary battery, control system thereof, and state detection method of lithium secondary battery
    • 锂二次电池,其控制系统和锂二次电池的状态检测方法
    • JP2012054220A
    • 2012-03-15
    • JP2010287956
    • 2010-12-24
    • Nec CorpNec Energy Devices LtdNecエナジーデバイス株式会社日本電気株式会社
    • IRIYAMA JIROKAJITA TETSUYAKAWASAKI DAISUKEKASAHARA RYUICHINUMATA TATSUJI
    • H01M10/48H01M4/48H01M10/44
    • H01M10/48G01R31/362G01R31/3648G06F17/15H01M4/485H01M10/44H02J7/00H02J7/007Y02E60/122Y02P70/54
    • 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.
    • 解决的问题:提供一种能够定量检测使用氧化硅作为负极活性物质的锂二次电池特有的劣化状态的锂二次电池控制系统,即不均匀的反应状态 的负极。 解决方案:设置有正极的锂二次电池控制系统,使用氧化硅作为负极活性物质的负极和具有用于负极的基准电位的锂参考电极包括:测量装置,用于 当锂二次电池放电时,测量锂参考电极用负极的电压V和锂二次电池的放电容量Q; 用于产生表示作为放电容量Q的变化dQ与电压V的变化dV与电压V之比的dQ / dV之间的关系的V-dQ / dV曲线的产生装置; 用于计算在V-dQ / dV曲线上出现的电压V中的两个电压值的两个峰值的强度比的计算装置; 以及检测装置,用于使用强度比检测负极状态。 版权所有(C)2012,JPO&INPIT