| 摘要 |
PROBLEM TO BE SOLVED: To obtain a voltage controller for battery pack wherein variation in terminal voltage is suppressed in proximity to 100% SOC and 50% SOC. SOLUTION: Voltage detection circuits 31 to 3n are placed in parallel with respective single cells 11 to 1n. The voltage detection circuits 31 to 3n respectively detect the terminal voltage of the single cells, and output detection signals. Current bypass circuits 21 to 2n are placed in parallel with the respective single cells 11 to 1n. The current bypass circuits 21 to 2n are fed with voltage detection signals from the voltage detection circuits 31 to 3n, respectively. When the terminal voltage of any of the single cells 11 to 1n reaches a first target voltage slightly lower than a voltage corresponding to 100% SOC during charging of the battery pack 1, the current bypass circuits 21 to 2n bypass charging current to the single cell. When the terminal voltage of any of the single cells 11 to 1n reaches a second target voltage corresponding to 50% SOC, the current bypass circuits 21 to 2n bypass charging current to the single cell. The target voltages are alternatively selected. COPYRIGHT: (C)2004,JPO |
