| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery charging device to charge a secondary battery such as lithium ion battery pack capable of charging lithium ion secondary battery using the-ΔV sensing system. SOLUTION: A lithium ion battery pack 1 includes a protection circuit 12 connected in series to a battery cell 11 for protecting it, and a battery charging device is composed of a power supply part 2 to charge the battery pack, a pack voltage sensing means 6 to sense the voltage of the pack, a cell voltage sensing means 7 to sense the voltage of the battery cell in the pack, a current sensing means 9 to sense the charging current of the pack, and a charging control means 10 to control charging of the pack, wherein the charging control means monitors the cell voltage and performs the constant-current, constant voltage charging of the pack with the output of the power supply part and stops charging upon sensing that the pack voltage has lowered -ΔV from the max. value. |
