| 摘要 |
PROBLEM TO BE SOLVED: To provide voltage detection apparatus for a battery pack that reduces input signal currents provided by each battery module for module voltage detection by a differential type voltage detection circuit, lowers a withstand voltage of each element in the differential type voltage detection, and highly accurately detects battery voltages. SOLUTION: A battery pack 19 is divided into multiple battery modules 101-120 which are mutually cascaded and each module voltage V1-V21 is sent to each A/D conversion circuit 5-8 after being detected by each differential type voltage detection circuit 201-220. A plurality of the differential type voltage detection circuits 201-220 which detect module voltages of multiple mutually adjacent battery modules constitute a voltage detection block. Common reference potential V4 is applied to an end of each input resistance network in each differential type voltage detection circuit 201-205 in the same voltage detection block, where the reference potential V4 is a different value for each voltage detection block. |
