Method for determining a current intensity of a current flowing into or out of a rechargeable battery connected to a power supply via at least one switch

摘要

The invention relates to a method for determining a current of a current flowing into or out of an accumulator, in particular a lithium-ion accumulator, connected to a power supply via at least one switch, in particular a contactor, characterized in that in the closed operating state of the current-carrying switch, the detected by the current across the switch falling base voltage and the contact resistance of the switch is determined, whereby to determine the contact resistance of the switch, the base voltage is superimposed with a test AC voltage, the frequency of which lies outside the frequency spectrum of the base voltage, and wherein the current intensity of the current flowing through the switch is determined from the ratio of the detected basic voltage and the determined contact resistance (RK) of the switch.