Estimation device for estimating variable state of energy storage cell of multi-cell battery of e.g. electric car, has processing unit to estimate voltage of cell as function of measured current and equivalent electrical model of cell

摘要

The device (D) has a processing unit (MT) to determine estimate of voltage (U-k) at terminals of an energy storage cell (C) as a function of measured current (I-k) and an equivalent electrical model of the cell. The cell includes a single spherical electrode, where the estimated voltage at a time is equal to the difference between intermediate value of the voltage across the cell at the time and a product of gain and the measured current, where the gain is representative of sum of resistances inducing ohmic loss in the electrode.