US 11,656,284 B2
Method for operating a battery sensor, and battery sensor
Henryk Frenzel, Regensburg (DE); and Andreas Aumer, Burglengenfeld (DE)
Assigned to Continental Automotive GmbH
Filed by Continental Automotive GmbH, Hannover (DE)
Filed on Oct. 10, 2019, as Appl. No. 16/598,022.
Claims priority of application No. 10 2018 217 528.4 (DE), filed on Oct. 12, 2018.
Prior Publication US 2020/0116794 A1, Apr. 16, 2020
Int. Cl. G01R 31/374 (2019.01); G01R 31/36 (2020.01)
CPC G01R 31/374 (2019.01) [G01R 31/3644 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for operating a battery sensor, wherein the battery sensor has at least one current measuring resistor, at least one voltage capture device and an evaluation circuit, the method comprising:
capturing, by the at least one voltage capture device, a voltage drop across the at least one current measuring resistor caused by a load current flowing from a first pole of a battery to a second pole of the battery through electrical connections of the battery sensor that are in contact with the first pole of the battery and the second pole of the battery, the at least one current measuring resistor of the battery sensor configured to measure the load current flowing from the first pole of the battery to the second pole of the battery,
determining, by the evaluation circuit, a correction value for the voltage drop, the correction value varying in accordance with a relationship to a temperature of the at least one current measuring resistor,
wherein determining the correction value comprising:
applying a reference current of known magnitude to the at least one current measuring resistor using a reference current device;
determining a change in the voltage drop on account of the reference current applied in addition to the load current using the voltage capture device; and
determining the correction value for the captured voltage drop;
after determining the correction value, determining, by the evaluation circuit, without using a temperature sensor, a first temperature value of the at least one current measuring resistor on the basis of the relationship between the determined correction value and the temperature of the at least one current measuring resistor;
wherein an electrical resistance of the at least one current measuring resistor is temperature-dependent;
determining the relationship between the temperature and the electrical resistance of the at least one current measuring resistor in advance;
storing the relationship in the evaluation circuit; and
determining for the determined correction value, the temperature of at least one measuring resistor from the previously determined relationship.