POWER STORAGE DEVICE AND CHARGING METHOD THEREOF

摘要

An object is to inhibit a decrease in the capacity of a power storage device or to compensate the capacity, by adjusting or rectifying an imbalance between a positive electrode and a negative electrode, which is caused by decomposition of an electrolyte solution at the negative electrode. Provided is a charging method of a power storage device including a positive electrode using an active material that exhibits two-phase reaction, a negative electrode, and an electrolyte solution. The method includes the steps of, after constant current charging, performing constant voltage charging with a voltage that does not cause decomposition of the electrolyte solution until a charging current becomes lower than or equal to a lower current value limit; and after the constant voltage charging, performing additional charging with a voltage that causes decomposition of the electrolyte solution until a resistance of the power storage device reaches a predetermined resistance.

主权项

1. A charging method of a power storage unit, comprising the steps of:
performing first charging with a first voltage;
measuring a capacity of the power storage unit after the step of performing the first charging;comparing the capacity with a value stored in a memory; and performing second charging with a second voltage after the step of comparing the capacity with the value,
wherein the second voltage is higher than the first voltage, andwherein the second charging is performed until a resistance of the power storage unit reaches a predetermined resistance.