Method for determining a load current and battery sensor

A method for determining a load current (Iload) flowing through a group of measuring resistors,

• wherein the group of measuring resistors has a number of branches and each branch has at least one respective first measuring resistor and one respective second measuring resistor,
• wherein the method comprises for each of the branches:
• measuring a first measurement voltage, which is dropped across the first measuring resistor, and a second measurement voltage, which is dropped across the second measuring resistor,
• calculating a first, operating parameter on the basis of the first measurement voltage and the second measurement voltage,
• wherein the method comprises solely during respective calibration periods:
• conducting a calibration current into the branch of the group of measuring resistors, wherein the calibration current is divided into a first calibration partial current flowing through the first measuring resistor and a second calibration partial current flowing through the second measuring resistor, and
• measuring a first calibration voltage, which is dropped across the first measuring resistor in the case of a flowing calibration current and load, current, and a second calibration voltage, which is dropped across the second measuring resistor in the case of a flowing calibration current and load current,
• wherein the second operating parameter is calculated on the basis of at least the first calibration voltage, the second calibration voltage, the first operating parameter and a current intensity of the calibration current.