BATTERY PACK VOLTAGE DETECTION DEVICE AND METHOD OF MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To solve the problem that the proportion of detection errors caused by electrical paths between battery cells and detection means has become relatively large because of the continuing improvement in detection accuracy of means for detecting battery cell terminal voltage (cell voltage Vij).SOLUTION: Cell voltages Vij are converted to digital data by an analog-to digital converter in a step S10, after which cell voltage values Vij are corrected using detection system correction values Vaij and individual difference correction values Vbij in steps S12 and S14. The detection system correction values Vaij are pre-computed, before the shipment of a voltage detection device used in the series of processes, as values to compensate for differences between cell voltage values Vij detected by an external detection device and detection values (cell voltage Vij) obtained with the detection device in use. The individual difference correction values Vbij are for compensating for deviations from a reference relationship between open end voltage and state-of-charge due to individual differences of battery cells.