Being the vehicle on-board state management device of on vehicle lead batterycell which detects the degradation state of the degradation state method of detection

摘要

PPROBLEM TO BE SOLVED: To provide a state controller for a lead-acid battery capable of detecting precisely a deterioration condition of the lead-acid battery, and a technique related thereto. PSOLUTION: An ideal internal resistance value RSBT/SBof an internal resistance value estimated in an ideal condition of the lead-acid battery 1 at a temperature value T is drawn out based on the temperature value T detected by a temperature sensor 3, an output voltage (the first voltage value VSB1/SB) of the lead-acid battery 1 before starting discharge, an output voltage (the second voltage value VSB2/SB) of the lead-acid battery 1 just after starting the discharge, and a discharge current value I are acquired via a voltage sensor 5 and a current sensor 6, synchronized with execution of pulse discharge from the lead-acid battery 1, an estimated internal resistance value RSBP/SBof an internal resistance value estimated in an actual condition of the lead-acid battery 1 is drawn out based on the acquired first voltage value VSB1/SB, second voltage value VSB2/SBand discharge current value I, and a degree of deterioration of the lead-acid battery 1 is determined based on a ratio of the drawn-out ideal internal resistance value RSBT/SBto the drawn-out estimated internal resistance value RSBP/SB. PCOPYRIGHT: (C)2005,JPO&NCIPI