BATTERY STATE DETECTION SYSTEM AND AUTOMOBILE COMPRISING THE SAME

摘要

Provided is a battery state detection system for accurately estimating the remaining capacity of a lead battery. A battery state detection system (12) comprises a microcomputer (10) for calculating the remaining capacitance (QOCV) of the lead battery by substituting the OCV of a lead battery (1) at the time of the stop of a vehicle into a map or a relational expression setting a relation between the OCV and the remaining capacity and calculating the remaining capacitance (QR) of the lead battery (1) by substituting the inner resistance of the lead battery (1), which is measured when power is supplied via an ignition switch (5) from the lead battery (1) to a cell motor (9), into a relational expression or a map of the inner resistance value of the lead battery (1) corresponding to a plurality of temperatures and remaining capacity. The remaining capacitance of the lead battery (1) before running is estimated from coefficients (WOCV, WR) determined by an error in a direct measurement amount and the remaining capacitances (QOCV, QR) calculated by the microcomputer (10).