| 摘要 |
PROBLEM TO BE SOLVED: To provide an open-circuit voltage estimation device which can estimate the open-circuit voltage of a secondary cell with high accuracy.SOLUTION: A differential voltage ΔV between a voltage V1 when a first current I1 flows in a secondary cell B and a voltage V2 when a second current I2 flows is measured, and an inclination r of a linear line L is found by this differential voltage ΔV and a differential current ΔI. With this method, an error in the inclination r can be reduced, as compared with a method in which the inclination of the linear line is found by linking two independently measured points. Although the coordinates of a point M, not just the inclination r, need to be found in order to determine the linear line L, but the linear line L only moves vertically in parallel within the error range of the point M, and therefore it is possible to estimate an open-circuit voltage OCV with high accuracy, as compared with the conventional method in which the error occurring in inclination is large.SELECTED DRAWING: Figure 3 |
