Device for measuring a battery current
First Claim
1. A device for measuring a battery current of a battery of a vehicle, comprisinga measurement path, including a thermistor via which a total battery current to be measured flows during the measurement,a measuring apparatus for measuring a voltage drop across the thermistor, anda current determination apparatus for determining the battery current on the basis of the measured voltage drop;
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generating and applying a measurement current to the thermistor,determining a change in resistance of the thermistor in response to the measurement current,determining a compensation current based on the change in resistance, andapplying the compensation current to the thermistor.
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Accused Products
Abstract
The present invention relates to a device for measuring a battery current of a battery. The device has a measuring distance, over which the entire battery current to be measured flows during the measurement. A measuring device measures a voltage drop across the measuring distance. On the basis of the measured voltage drop and a resistance of the measuring distance, a current determining device determines the battery current, wherein the measuring distance is formed by at least part of a cable with a temperature-dependent resistor.
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Citations
11 Claims
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1. A device for measuring a battery current of a battery of a vehicle, comprising
a measurement path, including a thermistor via which a total battery current to be measured flows during the measurement, a measuring apparatus for measuring a voltage drop across the thermistor, and a current determination apparatus for determining the battery current on the basis of the measured voltage drop; - and
a resistance compensation apparatus; generating and applying a measurement current to the thermistor, determining a change in resistance of the thermistor in response to the measurement current, determining a compensation current based on the change in resistance, and applying the compensation current to the thermistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle comprising a battery and a device for measuring a battery current of a battery of a vehicle, comprising
a measurement path, including a thermistor via which a total battery current to be measured flows during the measurement, a measuring apparatus for measuring a voltage drop across the thermistor, and a current determination apparatus for determining the battery current on the basis of the measured voltage drop; - and
a resistance compensation apparatus; generating and applying a measurement current to the thermistor, determining a change in resistance of the thermistor in response to the measurement current, determining a compensation current based on the change in resistance, and applying the compensation current to the thermistor.
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Specification