KR20190075812A - Method and battery sensor for identifying a load current - Google Patents

Abstract

The invention relates to a battery sensor (10) for determining a load current (18) of a battery, the battery sensor having at least one measuring resistor (24, 24a, 24b) and at least one measuring resistor 24b), and the battery sensor 10 is designed to detect the load current 18 from at least two detection devices (not shown) for detecting at least one battery parameter in each case (26, 26a, 26b, 34) and an evaluation device for identifying at least one correction factor from at least one battery parameter. The load current 18 is identified by the following steps:
comprising the steps of: a) detecting at least two battery parameters and time profiles of the battery parameters using at least two detection devices (26, 26a, 26b, 34)
b) determining at least one time profile of battery parameters and / or one of the battery parameters to determine a correction factor depending on detected battery parameters and / or detected time profiles of detected battery parameters; Determining at least one of:
c) identifying at least one correction factor using at least one selected battery parameter and / or a time profile of the at least one selected battery parameter,
d) determining at least a voltage drop across the measurement resistors (24, 24a, 24b) and a load current (18) from at least one correction factor.
The present invention further relates to a method for determining the load current of a battery having the steps.

Description

[0001] The present invention relates to a method and a battery sensor for identifying a load current,

The present invention relates to a method for identifying the load current of a battery using a battery sensor, wherein the battery sensor has at least one measuring resistor and detects a voltage drop across at least one measuring resistor, It is designed to identify the load current from the drop. The present invention further relates to such a battery sensor.

Battery sensors are used in vehicles to detect battery currents in a vehicle battery to enable reporting on the state of charge or health of the battery. The battery sensor is usually arranged in a pole of the battery, for example, having a battery terminal for contacting the vehicle battery. Moreover, the battery sensor usually has a voltage detection device capable of detecting a voltage drop of, for example, a load current of a current flowing across the measurement resistor, as well as a measurement resistor arranged in the current path of the load current. Once the electrical resistance of the measuring resistor is known, it is possible to use Ohm's law to identify the current flowing across the measuring resistor, ie the load current, from the voltage drop across the measuring resistor.

However, the electrical resistance of the measurement resistor depends on many factors and may also vary during operation or over the service life of the battery sensor. For example, the electrical resistance may vary depending on the temperature, depending on environmental influences or due to aging effects.

Moreover, the analog-to-digital converters or signal amplifiers used for signal processing may have absolute measurement errors, so-called offsets, which may cause additional inaccuracies in the measurement results.

Various methods for calibrating battery sensors are known from the prior art. For example, at least one correction factor for adjusting the detected voltage drop and / or electrical resistance is identified, thereby improving the accuracy of the current measurement. However, each of the known methods has disadvantages or can not be used in both operating conditions that occur during vehicle operation.

For example, the temperature of the battery or of the battery sensor, preferably the measuring resistor, can be detected. Correlation between the temperature and the correction factor, for example, the temperature / correction factor characteristic curve, has been previously identified. Once the temperature is known, a correction factor corresponding to the temperature or the corresponding electrical resistance can be taken from the characteristic curve and used for accurate calculation of the electrical resistance and hence the current. However, this identification of the correction factors by temperature only accounts for temperature-related changes in electrical resistance. Other changes in resistance or other effects on electrical resistance, such as aging-related changes or changes due to environmental effects, are not considered. In addition, the methods depend on the accuracy of the temperature measurement.

Alternatively, during operation of the battery sensor it is known to apply a defined reference current, known or measured to a very precise degree, to at least one measuring resistor and to identify an additional voltage drop at the measuring resistor caused by the reference current have. A correction factor for adjusting the correct electrical resistance of the measuring resistor or its electrical resistance can be identified from the voltage drop and the known reference current. However, these methods are not suitable if, for example, rapid changes in temperature and changes in electrical resistance arise therefrom.

It is an object of the present invention to provide a method and a battery sensor that make it possible to reliably determine the battery current in all of the operating conditions occurring in the vehicle.

To achieve the object, there is provided a method for identifying a battery current of a battery using a battery sensor, the battery sensor having at least one measuring resistor for detecting a voltage drop across at least one measuring resistor, It is designed to identify the battery current from the drop. The battery sensor has at least two detection devices for detecting at least one battery parameter in each case. The method has the following steps:

comprising the steps of: a) detecting at least two battery parameters and time profiles of the battery parameters using at least two detection devices (26, 26a, 26b, 34)

b) determining at least one time profile of one of the battery parameters and / or battery parameters to determine a correction factor in dependence on detected battery parameters and / or detected time profiles of detected battery parameters Determining at least one,

c) identifying at least one correction factor using a time profile of at least one selected battery parameter and / or at least one selected battery parameter,

d) determining at least a voltage drop across the measurement resistors (24, 24a, 24b) and a battery current (18) from at least one correction factor.

The values and time profiles of the at least two battery parameters thus determine at least one correction factor that can be determined using at least one of the battery parameters and a battery parameter of one of the battery parameters to determine a correction factor Is considered in each case to select for the time profiles, where the correction factor and method enable to determine the battery current as accurately as possible or at least one correction factor as precisely as possible . For example, the values of the battery parameters and / or the rate of change of the battery parameters are considered here. The rate of change may be in this case, for example, a time-dependent change in battery parameter, or a time-dependent rate of change in battery parameter.

The correction factor may subsequently be used to correct the electrical resistance of the measuring resistor or to identify a more accurate value for the electrical resistance. However, the correction factor can also be used to adjust the voltage signal identified from the voltage drop, after detection of the voltage drop across the measurement resistor.

As a result, on the one hand, it is possible to select the method and the battery parameter, respectively, whereby it is possible to identify the correction factor or the battery current in the most accurate manner, in the identified time profiles of the battery parameters. On the other hand, the battery sensor can have a simpler design. Since at least one correction factor is determined from only one battery parameter in each case, not all of the detected signals using the detection devices are to be processed at the same time. For example, joint processing devices, such as analog-to-digital converters or amplifiers, can thus be used in the detection devices. Depending on the selected method and selected battery parameters, the processing devices may be selectively used to process individual battery parameters or to identify the battery current.

The method may be performed using any methods for determining correction factors. It is only required that it is possible to determine the correction factors with different values and profiles of battery parameters, i.e. using different methods of operating states.

For example, the at least one battery parameter may comprise the temperature of the battery and / or the battery sensor, wherein the correction factor may be identified from the temperature to compensate for a temperature-related change in electrical resistance. The battery parameter is preferably the temperature of at least one measuring resistor.

The identification of the at least one correction factor using at least one temperature may be performed, for example, by selecting a correction factor from a previously identified correlation between temperature and at least one correction factor, in particular from a temperature / . Thus, the electrical resistances for certain temperatures or temperature profiles are predetermined, for example, in the form of characteristic curves, for example, in a test bench. Alternatively, at least one temperature-dependent correction factor is identified and stored. Once the temperature is identified, the previously stored data can be accessed and the electrical resistance of the measurement resistor can be identified using a corresponding correction factor. This makes it possible to simply and quickly identify the correction factor for the electrical resistance of the measurement resistor or the electrical resistance of the measurement resistor.

The at least one battery parameter may be a voltage drop across at least one measurement resistor. In this case, the detecting device preferably includes a voltage detecting device. The detecting device is formed by the voltage detecting device such that, for example, no separate detecting device is required.

The identification of the at least one correction factor by the voltage drop across at least one measurement resistor preferably comprises the following steps:

- application of a defined reference current to at least one measuring resistor,

- identification of the voltage drop of the reference current in at least one measuring resistor,

- identification of the correction factor from the voltage drop of the measuring current in at least one measuring resistor.

In contrast to the constantly changing load current during vehicle operation, the reference current is known. For example, the reference current is provided by a very precise reference current source and / or is identified to a very precise degree by the reference current measurement device. The correction factor for the electrical resistance of the measurement resistor or the electrical resistance of the measurement resistor can be identified from the voltage dropped at the measurement resistor due to the reference current by Ohm's law. Using the identified electrical resistance or the identified correction factor, the load current can be determined using the voltage drop of the load current.

The load current is preferably applied to at least one measuring resistor and the voltage drop of the reference current and of the load current in the at least one measuring resistor is identified. The correction factor may thus be determined during operation of the battery sensor.

Due to the voltage drop due to the reference current and the load current due to the reference current in order to make at least one correction factor determinable from the voltage drop of the reference current for the determination of at least one correction factor by measuring the voltage drop due to the reference current It is necessary to be able to distinguish between voltage drops.

A rapid change in temperature can cause a change in the electrical resistance of the measuring resistor and thus a change in the detected voltage drop, which affects the detection of the voltage drop due to the reference current. The rapidly varying load current, which causes a change in the voltage drop across the measuring resistor due to the load current, can also make it difficult to distinguish between the voltage drop due to the reference current and the voltage drop due to the load current. Furthermore, a load current that causes a higher and larger voltage drop compared to the reference current can make it difficult to determine a relatively low voltage drop due to the reference current.

The at least one voltage is thus preferably,

- if the rate of change identified from the time profile of at least one temperature is below a defined threshold,

- when the rate of change identified from the time profile of the at least one voltage is below a defined threshold, and

- If the load current falls below a defined threshold,

Is selected as the battery parameter for determining the correction factor.

When selecting the above-described methods for determining at least one correction factor, the temperature of the battery and / or the battery sensor, in particular the at least one measuring resistor, can also be advantageously identified and the temperature The identified correlations, in particular the temperature / correction factor characteristic curves, are at least equal to the at least the identified values using the voltage as the battery parameter if the rate of change of temperature is below the limit value, i. E. Very low, and / Is adjusted using one correction factor and the identified temperature.

If the temperature is constant or only very slowly changes, a very accurate determination of the correction factors from the voltage drop due to the uniform temperature distribution across the measuring resistor and hence the reference current can be assumed. The electrical resistance of the measuring resistor can thus be determined to a very precise degree. Since the temperatures are also known to a very precise degree, these values can be adjusted, for example, to correlate the temperature-dependent correction factors with the aging-related or environment-related changes of the electrical resistance of the measuring resistor, / RTI > can be used to calibrate or calibrate the < RTI ID =

The at least one temperature is preferably < RTI ID = 0.0 >

- if the rate of change identified from the time profile of at least one temperature does not fall below a defined threshold,

- if the rate of change identified from the time profile of at least one voltage does not fall below a defined threshold, and

- if the load current does not fall below a defined threshold,

Is selected as the battery parameter for determining the correction factor.

In other words, when the identification of at least one correction factor by voltage or voltage drop is not suitable as a battery parameter, for example for the reasons explained above, at least one temperature is determined by a battery It is used as a parameter.

To achieve this object, there is further provided a battery sensor for determining the load current of a battery, wherein the battery sensor has at least one measuring resistor and detects a voltage drop across at least one measuring resistor, Is designed to identify the current. The battery sensor has at least two detection devices for detecting at least one battery parameter in each case and an evaluation device for identifying at least one correction factor from the at least one battery parameter. The load current is identified, in particular using the method as described above.

The at least one detecting device may have a temperature sensor for detecting the temperature of the battery and / or of the battery sensor, in particular of the at least one measuring resistor.

Furthermore, the at least one detecting device may comprise a voltage detecting device for detecting a voltage drop across the at least one measuring resistor.

In the last-mentioned embodiment, the battery sensor preferably has a reference current source for applying a reference current defined in at least one measuring resistor.

Additional advantages and features will occur from the following description in connection with the accompanying drawings, in which:
Figure 1 shows a first embodiment of a battery sensor, and
2 shows a second embodiment of a battery sensor.

1 shows a battery sensor 10 for measuring battery current of a battery in a vehicle. The battery sensor 10 is arranged in the load current path 16 of the vehicle with the first connection 12 and the second connection 14 so that the load current 18 of the vehicle flows through the battery sensor 10. [

The battery sensor 10 can detect at least two battery parameters, in the illustrated embodiment, the temperature of the measuring resistor, the battery voltage, and the load current, to report on the state of charge and health of the battery.

To this end, the battery sensor 10 has a voltage measurement device 20 that is contact-connected to the first connection 12 to detect the battery voltage. Moreover, a current measuring device 22 is provided to determine the load current 18. Moreover, a temperature measuring device 23 is provided for determining the temperature of the battery or of the battery sensor.

The current measuring device 22 includes a measuring resistor 24 arranged in a load current path and a load current flowing therethrough and a plurality of input terminals 28a and 28b connected to the respective contact points 30a and 30b upstream and downstream of the measuring resistor 24, And a voltage detection device 26 that is contact-connected to the electrodes 30a and 30b. The voltage detection device 26 detects the voltage drop between the contact points 30a and 30b, that is, the voltage drop across the measurement resistor 24. The voltage detection device 26 may have an amplifier and / or an analog-to-digital converter.

Once the electrical resistance of the measurement resistor 24 is known, the detected voltage drop across the measurement resistor 24 can be used to determine the load current 18 from the Ohm's law (I = U / R).

However, the electrical resistance of the measurement resistor 24 may vary due to various factors, such as the temperature of the measurement resistor 24, due to aging and / or environmental effects. It is therefore necessary to identify the correction factors for determining the electrical resistance of the measuring resistor 24 as accurately as possible or for adjusting the measured voltage drop and / or the identified current before and during operation of the battery sensor 10 .

To this end, the battery sensor 10 is designed to detect battery parameters and determine at least one correction factor therefrom, wherein the correction factor is determined by the electrical resistance of the measurement resistor 24 and / or the output signal of the voltage detection device 26 / RTI >

The first battery parameter is the temperature signal 32 or the temperature of the measurement resistor 24 that is detected using the temperature measurement module 34. The temperature measurement module 34 includes two temperature sensors 36a and 36b that detect the temperature of the measurement resistor 24 at various positions of the measurement resistor 24 and output the temperature to the temperature measurement module 34. [ Lt; / RTI > The temperature measurement module 34 identifies the temperature signal 32 from the individual temperatures of the temperature sensors 36a and 36b and from there to either the electrical resistance of the measurement resistor 24 or the voltage detection device 26 And at least one correction factor for the detected voltage drop is identified in the evaluation unit (37).

The ratio between the electrical resistance of the measuring resistor 24 or the at least one correction factor and the temperature of the measuring resistor 24 was previously identified and stored. For example, the temperature / correction factor characteristic curve has been identified and stored in the evaluation unit 37. If the temperature is known or identified, a corresponding correction factor can be identified from the stored data.

Instead of the two temperature sensors 36a and 36b shown here, the average temperature or temperature distribution of the measurement resistor 24, also with respect to which individual temperature / correction factor characteristic curves are stored in the evaluation unit 37, It is possible to use one single temperature sensor or a plurality of temperature sensors are used.

The second battery parameter is the voltage drop identified using the voltage detection device 26. In order to be able to determine the correction factor from the voltage drop or the electrical resistance of the measuring resistor 24, a reference current circuit 38 is also provided. The reference current circuit 38 can apply the reference current 40 to the measurement resistor 24 with a known current intensity. The voltage drop across the measurement resistor 24 due to the reference current 40 can be determined using the voltage detection device 26 and the exact electrical resistance of the measurement resistor 24 can be determined from the voltage drop and from the voltage drop of the reference current 40 Can be determined from known current intensities.

The reference current circuit 38 includes a first contact 42 that is in contact with the first connection 12 of the battery sensor by a drop resistor 44, a second contact 46 that is arranged upstream of the measurement resistor 24, And a third connection 48 which is arranged downstream of the measuring resistor 24. The reference current circuit 38 further includes a reference current resistor 50 that is arranged between the first contact 42 and the third contact and a reference current resistor 50 that is electrically connected between the first contact 42 and the second contact 46 And a switch 52 for turning on and off. The reference current resistor 50 is preferably a highly accurate resistor whose electrical resistance is known to a very precise degree and whose electrical resistance is only very small changes due to aging, temperature, environmental effects or other factors.

Further, a second voltage detecting device 54 is provided for detecting a voltage drop across the reference current resistor 50. [ The measured voltage drop is transmitted to the circuit 56 where the voltage drop across the measurement resistor 24 detected by the voltage detection device 26 is also transmitted and the individual voltage drops can be separated from each other. A filter 57 is provided downstream of the circuit 56 to reduce noise in the signal.

The circuit 56 may further identify at least one correction factor from the voltage drop of the reference current across the measurement resistor 24. [

To determine the electrical resistance of the measurement resistor 24, during normal operation of the battery sensor 10, the switch 52 is closed and therefore the reference current 40 is applied to the measurement resistor 24. The voltage detection device 26 thus detects the voltage drop in the measurement resistor 24 caused by the reference current 40. [ In this case, whether or not the load current 18 is applied to the measurement resistor 24 is essentially insignificant. The voltage drop of the reference current 40 is detected using the second voltage detection device 54 and transmitted to the circuit 56 which also includes a voltage drop due to the reference current 40 and an optional And detects the voltage drop across the measuring resistor 24, which consists of the voltage drop of the load current 18.

The voltage drops may be separated from each other by circuitry 56 and at least one correction factor for the measured resistance of the measuring resistor or the measured voltage drop of the load current at the measuring resistor element 24 is greater than the reference current 40 ≪ / RTI >

Each identified correction factor is output to a switch 58 which switches the at least one correction factor identified from the temperature or at least one correction factor identified from the temperature to the evaluation device 60 Where the current intensity of the load current 18 is identified from the voltage drop detected by the voltage detection device 26, the output correction factor, and the electrical resistance of the measurement resistor 24.

A circuit having a plurality of comparison circuits 62a, 62b, 62c, 62d, 62e is provided to select each more convenient battery parameter for identifying at least one correction factor.

The first comparison circuit 62a has, as an input signal, a first threshold 64a indicative of a threshold for the magnitude of the voltage drop and the voltage drop detected by the voltage detection device 26.

In the first comparison circuit 62a the voltage drop detected using the voltage detection device 26 is compared to the first threshold 64a and the voltage is below the first threshold 64a, only one signal) is output.

The second comparison circuit 62b receives as an input signal the rate of change of the voltage drop detected by the voltage detection device 26 (the rate of change is identified by the circuit 65b) and the threshold value for the rate of change of the voltage drop And a second threshold value 64b indicating the second threshold value 64b.

If the rate of change or time profile of the voltage drop is compared with the second threshold 64b and the rate of change of the voltage drop below the second threshold 64b, i. E. The rate of change defined by the second threshold 64b When it occurs more slowly, only one signal is output.

The third comparison circuit 62c receives as an input signal the rate of change of temperature (the rate of change is identified by the circuit 65c from the temperature signal 32 identified using the temperature measurement module 34) And a third threshold value 64c indicating a threshold value for the second threshold value.

The third comparison circuit 62c checks to see if the rate of change of temperature or the change over time is below the rate of change defined using the third threshold 64c, When the threshold value 64c is lowered, only one signal is output.

Signals of the first comparison circuit 62a and the second comparison circuit 62b are output when only one of the signals of the first comparison circuit 62a and the second comparison circuit 62b exists And outputted to the fourth comparison circuit 62d.

Signals of the third and fourth comparing circuits 62c and 62d are outputted to the fifth comparing circuit 62e which outputs only one signal when both signals exist.

The signal of the fifth comparison circuit 62e is outputted to the switch 58 as a switching signal.

If no switching signal is present at the switch 58, the switch is switched so that at least one correction factor identified from the temperature is output to the evaluation device 60, i. E. The temperature of the measurement resistor is used to identify the correction factor.

If there is a switching signal on the switch 58, the switch is switched such that at least one correction factor identified from the voltage profile or voltage when the reference current 40 is applied is output to the evaluation unit 60.

At least one correction factor identified from the voltage profile or voltage when the reference current 40 is applied is therefore only < RTI ID = 0.0 >

If the voltage drop is below the first threshold, that is to say that there is not an excessively high voltage drop and consequently also an excessively high load current,

If the rate of change of the voltage drop is below the second threshold, i. E., Only a slow change of the voltage drop over time, and

- if the rate of change of temperature is below a third threshold, that is to say slower,

It is used to identify the load current.

An excessively high load current or an excessively high voltage drop due to the load current 18 in the measurement resistor 24 is due to the voltage drop due to the reference current 40 which is very low compared to the load current, .

Moreover, fast and larger changes in the load current 18 can make it difficult to accurately determine the voltage drop due to the reference current 40.

A rapid change in the temperature of the measurement resistor 24 may cause a change in the electrical resistance of the measurement resistor, which may likewise make it difficult to accurately determine the voltage drop due to the reference current.

If one of these factors is present, the load current is thus identified by a temperature-dependent correction factor.

The voltage drop due to the reference current 40 can be determined with sufficient accuracy and the load current can be determined by the detected voltage drop at the measuring resistor 24 or the reference voltage at the measuring resistor 24, May be identified using at least one correction factor identified from the identified voltage drop due to the voltage drop.

Depending on the magnitude of the load current 18 and its time profile and the temperature of the measurement resistor 24, individual battery parameters that are better suited to identifying one or more correction factors may thus vary from individual battery parameters In this embodiment, is selected from temperature or voltage drop, and at least one correction factor is identified using the same.

If the three conditions mentioned above are present and the correction factor is identified from the voltage drop or voltage at the measurement resistor 24, the second switch 66 is also closed, thereby causing the output correction factor to reach the evaluation unit 37, . As a result, the stored correction factor or temperature / correction factor characteristic curve for the co-existing temperature or temperature distribution of the measurement resistor 24 can be used to determine the electrical resistance of the measurement resistor 24 due to, for example, aging or other environmental influences Lt; RTI ID = 0.0 > and / or < / RTI > The subsequent identification of the correction factor by the temperature thus takes place in a much more precise manner.

The battery sensor shown in Fig. 2 differs from the battery sensor described above in that two measurement resistors 24a, 24b are provided, in which respective voltage detection devices 26a, 26 are associated.

The individual temperature sensors 36a and 36c are associated with respective measurement resistors 24a and 24b, wherein the temperature sensors are connected to the common temperature measurement module 34. [

The voltage drops detected using the voltage detection devices 26a and 26b are added to the circuit 68 and output to the first comparison circuit 62a, the second comparison circuit 62b, and the evaluation device 60. The comparison with the first threshold 64a and the second threshold 64b thus takes place using the total voltage drop identified from the individual voltage drops in the measurement resistors 24a, 24b.

Moreover, in a further circuit 70, a difference between the detected voltage drops is formed and output to the circuit 56.

In the case of the battery sensor 10, the battery parameter at which the correction factor for the load current identification is identified also includes the voltage drops at the measurement resistors 24a, 24b, their time profiles and temperature, Values < / RTI > 64a, 64b, 64c.

The plurality of correction factors may also be identified from the battery parameters to improve the accuracy of the identification of the load current 18.

Moreover, other methods for identifying one or more correction factors may also be used, particularly by also determining other battery parameters.

It is only necessary to determine in advance which of the battery parameters that can be detected by the battery sensor is used and which makes it possible to more accurately identify the at least one correction factor or more accurately identify the load current. An individual battery parameter may be selected to determine at least one correction factor used to enable the most accurate determination of the load current 18, depending on the respective battery parameters or their values and time profiles have.

Claims (13)

A method for identifying a load current (18) of a battery using a battery sensor (10)
The battery sensor has at least one measuring resistor (24, 24a, 24b) and detects a voltage drop across the at least one measuring resistor (24, 24a, 24b) and identifies the load current (18) , Wherein the battery sensor (10) has at least two detection devices (26, 26a, 26b, 34) for detecting at least one battery parameter in each case, The method includes the steps of:
a) detecting at least two battery parameters and time profiles of the battery parameters using the at least two detection devices (26, 26a, 26b, 34)
b) determining at least one of the battery parameters and / or one of the battery parameters to determine a correction factor depending on the detected battery parameters and / or the detected time profiles of the detected battery parameters. Determining at least one of the one time profile,
c) identifying at least one correction factor using the at least one selected battery parameter and / or the time profile of the at least one selected battery parameter,
d) determining the load current (18) from at least one correction factor and at least a voltage drop across the measurement resistors (24, 24a, 24b). The method according to claim 1,
Characterized in that at least one battery parameter comprises the temperature of the battery and / or the temperature of the battery sensor (10), in particular the at least one measuring resistor (24, 24a, 24b) . 3. The method of claim 2,
Wherein said identification of at least one correction factor using at least one temperature comprises the selection of a correction factor from a previously identified correlation between said temperature and said correction factor, in particular from a temperature / correction factor characteristic curve The method comprising: 4. The method according to any one of claims 1 to 3,
Wherein at least one battery parameter is a voltage drop across the at least one measurement resistor (24, 24a, 24b). 5. The method of claim 4,
Said identification comprising the steps of:
- application of a defined reference current (40) to at least one measuring resistor (24, 24a, 24b)
- identification of the voltage drop of the reference current (40) in the at least one measurement resistor (24, 24a, 24b)
- identification of a correction factor from the voltage drop of the measuring current (40) at the at least one measuring resistor (24, 24a, 24b)
≪ / RTI > wherein at least one of the load currents is at least one of a load current and a load current. 6. The method of claim 5,
Characterized in that a load current (18) is applied to the at least one measuring resistor (24, 24a, 24b) and the current of the reference current (40) ≪ / RTI > of the load current is identified. 7. The method according to any one of claims 4 to 6,
At least one voltage drop across the measurement resistors (24, 24a, 24b)
If the rate of change identified from the time profile of at least one temperature is below a defined threshold 64c,
- when the rate of change identified from the time profile of the at least one voltage drop across the measurement resistors (24, 24a, 24b) falls below a defined threshold (64b) and
- if the voltage drop across the at least one measurement resistor (24, 24a, 24b) falls below a defined threshold (64a)
Wherein the correction factor is selected as a battery parameter for determining the correction factor. 8. The method of claim 7,
Characterized in that the temperature of the battery and / or of the battery sensor (10), in particular of the at least one measuring resistor (24, 24a, 24b), is identified and the previously identified correlation between the temperature and the at least one correction factor, The temperature / correction factor characteristic curve is set such that the voltage drop across the at least one measurement resistor (24, 24a, 24b) as a battery parameter when the rate of change of the temperature is below a defined threshold value and / Is adjusted using said at least one correction factor identified from said temperature and said identified temperature. 9. The method of claim 8,
The at least one temperature,
- if the rate of change identified from said time profile of said at least one temperature does not fall below a defined threshold 64c,
- the rate of change identified from the time profile of the at least one voltage drop across the measurement resistors (24, 24a, 24b) does not fall below a defined threshold value (64b), or
- if the voltage drop across the at least one measurement resistor (24, 24a, 24b) does not fall below a defined threshold (64a)
Wherein the correction factor is selected as a battery parameter for determining the correction factor. A battery sensor (10) for determining a load current (18) of a battery,
The battery sensor has at least one measuring resistor (24, 24a, 24b) for detecting a voltage drop across the at least one measuring resistor (24, 24a, 24b) and for identifying the load current , Wherein the battery sensor (10) comprises at least two detection devices (26, 26a, 26b, 34) for detecting at least one battery parameter in each case and at least one correction Wherein the load current (18) is identified using a method for identifying the load current as described in any one of claims 1 to 9. 11. The method of claim 10,
The at least one detecting device has a temperature sensor (36a, 36b) for detecting the temperature of the battery and / or the battery sensor (10), in particular the at least one measuring resistor (24, 24a, 24b) Features a battery sensor. The method according to claim 10 or 11,
Characterized in that the at least one detection device comprises a voltage detection device (26, 26a, 26b) for detecting a voltage drop across at least one measurement resistor (24, 24a, 24b). 13. The method according to any one of claims 10 to 12,
A reference current circuit (38) is provided for applying a reference current (40) defined in at least one measurement resistor (24, 24a, 24b).

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