| 摘要 |
A charging method for charging a secondary battery includes the steps of: (a) performing constant-current charging with a first current; and (b) when a voltage of a secondary battery reaches a first voltage, performing constant-voltage charging at the first voltage. When a temperature of the secondary battery is equal to or higher than a reference temperature in step (a), step (b) includes the steps of (b1) when the voltage of the secondary battery reaches a second voltage lower than the first voltage, performing constant-voltage charging at the second voltage, (b2) after step (b1) and when the temperature of the secondary battery falls below the reference temperature, performing charging with a second current, and (b3) when the voltage of the secondary battery reaches the first voltage, performing constant-voltage charging at the first voltage.
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