| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery state estimation device capable of estimating an exact state of a battery. SOLUTION: In this estimation device, a storage part 12 stores a characteristic pattern 12a indicating a relation between reference release voltage values of a reference battery under a plurality of charged conditions including a full charge condition and an overcharge condition, and a difference value between the reference release voltage values and reference discharge voltage values under a discharged condition connected to electric loads. A voltage detecting part 13 detects the release voltage values and the discharge voltage values of the battery 20 under the conditions connected and not connected to the electric loads 31, 32 etc., and a voltage-drop amount calculating part 11a calculates the deference value between the voltages under the both conditions. The reference release voltage value corresponding to the calculated difference value is drawn out based on the characteristic pattern 12a, and a deterioration degree calculating part 11b calculates a deterioration degree of the battery, based on the reference release voltage value, the release voltage value and the full-charge reference release voltage value under the full charge condition of the reference battery stored in the storage part 12. COPYRIGHT: (C)2008,JPO&INPIT |
