| 摘要 |
This lithium ion secondary battery control device is a device for controlling charging and discharging of a lithium ion secondary battery, and is characterized by the provision of a detection unit, a memory unit, and an arithmetic processing unit, wherein: the memory unit holds first data related to the relationship between the open-circuit voltage and the state-of-charge of the lithium ion secondary battery at stable time, and also holds second data related to the relationship between a relaxation rate, which represents the value of open-circuit voltage variation per time unit, and the open-circuit voltage of the lithium ion secondary battery at stable time; the detection unit measures the open-circuit voltage of the lithium ion secondary battery; from the variation over time of the open-circuit voltage, the arithmetic processing unit calculates the relaxation rate, which represents the value of open-circuit voltage variation per time unit, and calculates the state-of-charge of the lithium ion secondary battery using the open-circuit voltage and the relaxation rate of the lithium ion secondary battery, and the first data and the second data. This allows the state-of-charge of the lithium ion secondary battery to be grasped accurately in a short time, preventing over-charge and over-discharge. |
