| 摘要 |
Within a predetermined time interval during discharging of a non-aqueous electrolyte secondary battery (10) containing graphite and silicon or a silicon compound in a negative electrode, this control device uses voltage variation dV and capacity variation dQ to detect dV/dQ and positions the inflection point of dV/dQ in the initial state of the non-aqueous electrolyte secondary battery to fall outside of a predetermined range of SOC use. Thereafter, as the charge-discharge cycles progress, the control device (12) sequentially detects the dV/dQ inflection point for the non-aqueous electrolyte secondary battery (10), sequentially detects the SOC corresponding to the inflection point, compares the detected SOC with the usage range, and when the SOC has shifted to be within the usage range, stops the discharging at this SOC. In the initial stage of the charge-discharge cycle, discharge control is carried out with a graphite utilization rate of 80% or greater and under 100%, and without using silicon or silicon compound. |
