METHOD AND DEVICE TO CHARGE SECONDARY LITHIUM ION BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a method and device to quickly charge a secondary lithium ion battery within one hour or even within 10-20 minutes without causing a large drop in its cycle characteristics. SOLUTION: When supplying current to charge a secondary lithium ion battery 21, a current control 5 is provided to control the current so that it exceeds the rated maximum charging current of the battery 21. Further, a charged amount control 7 is provided to continue the charging up to a target set to half the rated maximum full charge of the battery 21. The battery is charged up to half the maximum full charge in the first charging step using the current exceeding the rating.