| 摘要 |
PROBLEM TO BE SOLVED: To estimate more accurate battery capacity by finding an actual battery characteristic through the correction of an initial battery characteristic using a battery correction factor computed on the basis of battery temperature and a deterioration correction factor which is computed on the basis of a battery deterioration. SOLUTION: A power operation part 2 makes a primary regressive operation regarding an IV characteristic for every prescribed discharge current, and computes a maximum battery output Pmax at that time. An operating part 12 for a temperature correction factorαcomputes the value ofαon the basis of battery temperature. An operation part 14 for capacity deterioration correction factorβcomputes the value ofβ, on the basis of a temperature correction factorηfor battery deterioration and an internal resistance deterioration correction factorγand then computes a characteristic formula showing the correlation of discharge power Wh and power P, according to the correction factorsα,βandγ. A minimum guarantee power operation part 16 sets the value of Pmin, and a full capacity operation part 17 computes battery capacity Wh during a time up to the arrival at Pmin. Then, discharge power WhR =Wh (Pmax) up to the current time is computed from the power operation value Pmax and the characteristic formula. A residual capacity operation part 18 computes the residual capacity. |
