INTENAL TEMPERATURE DETECTION DEVICE FOR BATTERY

摘要

PROBLEM TO BE SOLVED: To accurately detect the internal temperature of a battery without directly mounting a sensor inside the battery. SOLUTION: An average heat generation value Qave as an average value at a predetermined time of a heat generation value Q inside a battery calculated from a charging/discharging current I is found (S100-S108), and a correction value T1 is determined from the found average heat generation value Qave and a cooling condition C of the battery (S112). At that time, the relationship among the average heat generation value Qave, the cooling condition C and the correction value T1 is previously obtained from an experiment or the like. The internal temperature Ti inside the battery is calculated by adding the correction value T1 to the temperature To on the surface of a battery container. As a result, the internal temperature of the battery can be detected without mounting a temperature sensor inside the battery.