Remaining capacity meter and detection method for electric vehicle battery

摘要

A remaining capacity meter is provided for an electric vehicle battery. This meter is suited for use in the detection of a remaining capacity of the electric vehicle battery. The meter includes a full charge detection device for detecting whether the battery has been brought into a fully-charged state, a remaining capacity setting device for setting, as a full-charge-time capacity, the remaining capacity of the battery at the time of detection of the fully-charged state by the full charge detection device, a discharge/charge-based correction device for correcting the remaining capacity, which has been set by the remaining capacity setting device, while integrating, with respect to time, a current discharged from or charged into the battery, and a deterioration-based correction device for correcting the fully-charged capacity, which has been set by the remaining capacity setting device, by a deterioration-based correction quantity corresponding to the number of chargings and battery temperatures at the time of the respective chargings. A method for the detection of the remaining capacity of such an electric vehicle battery is also described.