CN112858934B - Method for testing a battery sensor, and battery sensor - Google Patents
Method for testing a battery sensor, and battery sensor Download PDFInfo
- Publication number
- CN112858934B CN112858934B CN202011229264.6A CN202011229264A CN112858934B CN 112858934 B CN112858934 B CN 112858934B CN 202011229264 A CN202011229264 A CN 202011229264A CN 112858934 B CN112858934 B CN 112858934B
- Authority
- CN
- China
- Prior art keywords
- voltage
- battery
- battery sensor
- sensor
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 21
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 description 26
- 230000009897 systematic effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2632—Circuits therefor for testing diodes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a method for testing a battery sensor, wherein the battery sensor has a recording device for recording a battery parameter, an evaluation circuit for evaluating the battery parameter, and a current source, the method having the following steps: a) determining a first voltage drop between a first contact point upstream of the diode and a second contact point downstream of the electronic component in a first state in which only the operating current flows through the electronic component, b) then determining a second voltage drop between the first contact point and the second contact point in a second state in which an additional measuring current flows through the electronic component, c) determining the operating current flowing through the electronic component from the first voltage drop, the second voltage drop and the known measuring current, d) determining a sensor parameter from the operating current, e) comparing the sensor parameter with a limit value; f) If the sensor parameter exceeds and/or falls below a limit value, a fault signal is output.
Description
Technical Field
The invention relates to a method for testing a battery sensor, wherein the battery sensor has at least one recording device for recording battery parameters, an evaluation circuit for evaluating the at least one recorded battery parameter, and a current source of the battery sensor. The invention also relates to such a battery sensor.
Background
Battery sensors are used in vehicles to record battery parameters in order to evaluate the state of the vehicle battery, in particular the state of charge of the vehicle battery. For this purpose, the battery sensor has a recording device, for example, of the battery voltage, the battery current or the battery temperature. The battery sensor must be able to determine battery parameters with very high reliability. For this reason, the battery sensor needs to have a diagnostic function so as to be able to test its own function, particularly at regular time intervals.
Disclosure of Invention
It is an object of the present invention to provide a method for testing a battery sensor and a battery sensor, both of which allow reliable testing of the battery sensor.
In order to achieve this object, a method for testing a battery sensor is provided, wherein the battery sensor has at least one recording device for recording battery parameters, an evaluation circuit for evaluating the at least one recorded battery parameter, and a current source of the battery sensor, wherein a feed line for an operating current of the current source has electronic components whose voltage, current and temperature dependence, in particular in the form of a performance map, is stored in a controller of the battery sensor. The method comprises the following steps:
a) In a first state in which only the operating current flows through the electronic component, determining a first voltage drop between a first contact point upstream of the electronic component and a second contact point downstream of the electronic component,
B) Then, in a second state in which a defined additional measuring current flows through the electronic component, a second voltage drop between a first contact point upstream of the electronic component and a second contact point downstream of the electronic component is determined,
C) The operating current through the electronic component is determined from the recorded first voltage drop, the recorded second voltage drop and the known measured current,
D) Determining at least one sensor parameter based on the determined operating current,
E) Comparing the at least one sensor parameter with at least one limit value;
f) If the sensor parameter exceeds and/or falls below at least one limit value, a fault signal is output.
The electronic component is, for example, a diode, and the dependency relationship among voltage, current, and temperature is represented by a diode characteristic diagram.
The advantages of the above method are described below by taking as an example a diode as the electronic component, any other electronic component whose dependency between voltage, current and temperature (in particular in the form of a performance diagram) is known may be used instead of the diode.
The diode is typically connected upstream of the current source of the battery sensor as a polarity reversal protection and is intended to keep the negative supply voltage away from the battery sensor, in particular from the circuitry of the battery sensor. All of the operating current consumed by the battery sensor flows through this diode.
Such diodes generally have a so-called diode characteristic diagram. In the case of a diode, the voltage drop across the diode will vary with temperature, where the rate of temperature change is proportional to the change in voltage drop. The diode characteristic diagram shows the relationship between current and voltage drop at different temperatures. That is, the characteristic curve of the performance map defines the relationship between the current flowing through the diode and the voltage drop across the diode at a particular temperature. The current is typically plotted on a logarithmic scale with respect to the voltage, which means that the characteristic curves are approximately linear and parallel to each other over the relevant operating range.
To determine the operating current of the battery sensor, the current through the diode can thus be determined.
For this purpose, in a first state in which only the unknown operating current I1 flows through the diode, the voltage drop U1 across the diode is first measured by measuring the voltages upstream and downstream of the diode. Next, in the second state, the measurement current Is additionally led through the diode, so that the total current i2=i1+is flows through the diode, and the voltage drop U2 Is measured. Two pairs of values (I1, U1) and (I1+IS; U2) were obtained from the two measurements. Using these two pairs of values, the gradient a of the diode characteristic curve in the relevant operating range can be calculated in the diode characteristic map. The operating current I1 may then be calculated, for example, using the equation given below.
a*(U2-U1)＝log10(I2)-log10(I1)
The calculated operating current may be used to test various parameters of the battery sensor.
The operating current of the battery sensor can be easily determined using the above-described method, for example without knowing the exact resistance of the electronic component. It is only necessary to record the voltage drop across the electronic component and apply a known additional measuring current.
The at least one sensor parameter may be, for example, the current consumption of the battery sensor itself and the first limit value is the maximum current consumption of the current source. Thus, the above method can be used to test whether the current consumption of the battery sensor itself is too high. In this case, it is assumed that the operation of the battery sensor is incorrect or defective, and a fault signal is output.
Since, at different temperatures, there is a corresponding characteristic curve (in particular a diode characteristic curve) in the dependence between the stored voltage, current and temperature (in particular in the stored diode characteristic diagram), by determining the corresponding characteristic curve (in particular a diode characteristic curve) in which the two pairs of values lie, the temperature of the electronic component, in particular the diode, can also be determined from the measured values and the determined operating current. Since the electronic components are located on the circuit board of the battery sensor, the temperature essentially corresponds to the battery sensor temperature. Thus, the at least one sensor parameter may be a first battery sensor temperature determined from the determined voltage, the determined current and a dependency between the voltage, the current and the temperature of the electronic component. This temperature can be compared with a limit value.
Alternatively or additionally, the battery sensor may have an internal temperature sensor for determining a second battery sensor temperature that is compared to the battery sensor temperature. In this embodiment, the at least one limit value is defined as the maximum difference between the battery sensor temperature and the second temperature.
One sensor parameter may be the feed line resistance of the current source. In a state where the battery voltage is substantially constant, the voltage upstream of the electronic component in both states can be recorded. The difference between the measured voltages Is proportional to the increased measured current Is and the feed line resistance. Since the measured current Is known, the feed line resistance can be calculated and compared with a predefined maximum value. If the measured feed line resistance is too large, a fault signal is likewise generated.
In order to record the voltage drop across the electronic component, it is necessary to record the voltage upstream and downstream of the electronic component. This recording may be performed in various ways. By way of example, the battery sensor may have a voltage recording device which is connected alternately in each case to the first contact point and the second contact point in order to record the first voltage drop and the second voltage drop. Thus, for example, systematic errors in the measurements, for example offset errors of the voltage recording device, can be compensated for, since these errors occur to the same extent in both measurements, and therefore cancel out when the voltage drop is subtracted.
Alternatively, the battery sensor may have a first voltage recording device and a second voltage recording device, wherein the first voltage recording device is connected to the first contact point and the second voltage recording device is connected to the second contact point, wherein the voltages at the first contact point and at the second contact point are recorded simultaneously. The advantage of using two voltage recording means is that the voltage can be measured at two contact points simultaneously, so that the measurement of the voltage drop is substantially independent of the voltage fluctuations during the measurement.
The first voltage recording means may record the battery voltage, for example. Since the first voltage recording means is arranged upstream of the electronic component and is thus connected to one of the battery poles, this first voltage recording means can also record the battery voltage. In particular, a respective voltage divider is provided upstream of the first voltage recording device and/or the second voltage recording device in order to reduce the voltage to be measured at the first voltage recording device and/or the second voltage recording device. A corresponding filter, in particular a low-pass filter, may also be provided upstream of the first voltage recording device and/or the second voltage recording device.
The second voltage measuring device may be alternately connected to the second contact point and the temperature sensor. Battery sensors typically have a temperature sensor whose value is recorded using a recording device. However, since the temperature of the battery sensor changes only slowly, the recording means of the temperature sensor can also be used temporarily for recording other values, in particular the voltage at the second contact point. For this purpose, a change-over switch is preferably provided, which is capable of alternately connecting the recording device to the second contact point and the temperature sensor.
Alternatively, the relative error of the first voltage recording means and the second voltage recording means may be determined from the voltages determined at the first contact point and the second contact point in the second state.
The second state is formed, for example, by forming an electrical connection between the energy source and the negative electrode of the battery, wherein at least one resistor having a known resistance is arranged in series between the energy source and the battery. Thereby, an additional measuring current of a known magnitude can be easily conducted through the diode. A switch is preferably provided to form an electrical connection.
The battery sensor optionally has a current recording device with a measuring resistor and a recording device for recording a voltage drop across the measuring resistor, which recording device is in contact with a first contact upstream of the measuring resistor and a second contact downstream of the measuring resistor, wherein an electrical connection is connected to the first contact and the second contact, and wherein a fault message is output if the voltage drop exceeds a limit value in the second state. Recording means for recording the voltage drop across the measuring resistor record the difference between the voltages between the two contacts of the measuring resistor. If a measuring current is likewise applied to the contacts, this can lead to a change in the voltage at the two contacts, which generally causes only a small change in the measuring voltage drop across the measuring resistor. On the other hand, if the connection of one of the contacts to the recording device for recording the voltage drop is interrupted, only the measuring current additionally applied at the respective other contact causes a change in the measuring voltage, so that the recorded voltage drop changes as a result of the measuring current being applied. Thus, the conclusion of the failure of the current recording device is drawn from the change in the voltage drop across the measuring resistor in the second state or in the change from the first state to the second state, and a failure signal can be output.
In order to achieve this object, a battery sensor for registering at least one battery parameter is also provided, which has at least one registering device for registering a battery parameter, an evaluation circuit for evaluating the at least one registered battery parameter, and a current source of the battery sensor, wherein a feed line for an operating current of the current source has an electronic component, the voltage, current and temperature dependence of which is known, in particular as a diode for polarity reversal protection, wherein the battery sensor has means for forming a second state in which an additional measuring current flows through the electronic component, and at least one registering device for registering a voltage drop between a first contact point upstream of the electronic component and a second contact point downstream of the electronic component. A controller for performing at least one of the above methods is also provided. The controller preferably stores a dependency between the voltage, the current and the temperature of the electronic component, in particular a diode characteristic map of the diode, which has a plurality of diode characteristic curves for different temperatures.
The battery sensor may have an internal temperature sensor by which a second battery sensor temperature is determined, wherein the controller is able to compare the second battery sensor temperature with the first battery sensor temperature and output a fault signal if a limit value defining a maximum difference between the battery sensor temperature and the second temperature is exceeded.
By way of example, the battery sensor has a voltage recording device that can be alternately connected to the first contact point and the second contact point to record the first voltage drop and the second voltage drop. In particular, a switch is provided for alternately connecting the voltage recording means to the first contact point and the second contact point.
Alternatively, the battery sensor may have a first voltage recording device and a second voltage recording device, wherein the first voltage recording device is connected to the first contact and the second voltage recording device is connected to the second contact.
The first voltage recording means may also record the battery voltage.
The second voltage measuring device may alternatively be connected to the second contact point and to the temperature sensor, in particular to the change-over switch.
In order to conduct the measuring current through the electronic component, an electrical connection can be made between the energy source and the negative pole of the vehicle battery, wherein at least one resistor having a known resistance is arranged in series between the energy source and the battery. A switch is preferably provided to close or open the electrical connection.
The battery sensor has, for example, a current recording device with a measuring resistor and a recording device for recording a voltage drop across the measuring resistor, which recording device is in contact with a first contact upstream of the measuring resistor and a second contact downstream of the measuring resistor.
Drawings
Further advantages and features will become apparent from the following description in conjunction with the accompanying drawings. In the drawings:
Fig. 1 shows a schematic illustration of a battery sensor according to the invention;
FIG. 2 shows an exemplary illustration of a diode characteristic diagram of a diode;
Fig. 3 shows a diagram of a method for testing a battery sensor according to the invention.
Detailed Description
Fig. 1 shows a battery sensor 10 for registering battery parameters of a vehicle battery 12. The battery sensor 10 is secured at and in electrical contact with a first battery pole 14 of the vehicle battery 12 by an pole terminal. The battery sensor 10 is also electrically connected to the second battery pole 18 via the vehicle's power cancellation device 16 or generator 22 such that load current from the vehicle battery 12 flows through the battery sensor 10.
The battery sensor 10 has a current source 20 for the operating current I1 of the battery sensor 10, which is in contact with the second battery pole 18 via a feed line 24. The current source 20 supplies the operating current I1 to the entire battery sensor 10, in particular to a controller or an evaluation unit of the battery sensor 10. A feed line resistor 26 and an electronic component 28 in the form of a diode are arranged in the feed line 24. The diode has a polarity inversion protection function which aims to protect the circuitry of the battery sensor 10 from negative voltages.
In this embodiment, the battery parameters to be monitored by the battery sensor 10 are battery current 25 (i.e., load current), battery voltage, and battery temperature.
The battery voltage is recorded by a first voltage recording device 30 connected to a first contact point 32 upstream of the electronic component 28. The first voltage recording means 30 have a change-over switch 34 and a recording unit 36 with an analog-to-digital converter. A voltage divider 38 consisting of two resistors 40, 42 is arranged between the first contact point 32 and the first voltage recording means 30.
A second voltage recording device 44 is also provided, which can be connected to a second contact point 46 downstream of the electronic component 28. The second voltage recording means 44 have a change-over switch 48 and a recording unit 50 with an analog-to-digital converter. The temperature sensor 52 is also connected to the transfer switch 48. The contact point 46 or the temperature sensor 52 may thus be selectively connected to the recording unit and the analog-to-digital converter 50 via the change-over switch 48. In the same way as the first voltage recording means 30, a voltage divider consisting of two resistors 54, 56 is arranged between the second contact point 46 and the change-over switch 48.
A corresponding filter, in particular a low-pass filter, which is formed, for example, by a resistor and a capacitor, can additionally be provided between the contact point 32 and the first voltage recording device 30 and between the second contact point 46 and the second voltage recording device 44.
The current recording device 58 has a measuring resistor 60 arranged on the current path and two contacts 66, 68 connected to the upstream and downstream of the measuring resistor 60 via a differential amplifier 64, and is capable of recording the voltage drop between the two contacts 66, 68. Between the recording device 62 and the contacts 66, 68, respective resistors 70, 72 are provided, wherein the resistors 70, 72 have in particular the same resistance.
The resistance of the measuring resistor 60 is known, which means that the current flowing through the measuring resistor 60, i.e. the battery current 25, can be calculated from the recorded voltage drop across the measuring resistor 60 and the resistance of the measuring resistor 60 using ohm's law.
The battery sensor also has an electrical connection 74 between the current source 20 and the first battery pole 14, which can be opened or closed via a switch 76.
The electrical connection 74 has a first branch connected to the contact 66 via a resistor 78 and a resistor 80, wherein a line 82 diverges between the resistors 78 and 80 and is connected to the first contact 66, i.e., the input of the differential amplifier 64, via a resistor 84. In this case, resistors 78, 80 form a voltage divider, wherein the divided voltage is applied to the input of differential amplifier 64 via line 82 and resistor 84.
Similarly, a second branch is provided, which has a voltage divider formed by resistors 86, 88, wherein a connection to the second contact 68 is made via the resistors 86, 88 and a connection to the second contact 68 (i.e. the second input of the differential amplifier 64) is made via a further resistor 90.
The battery sensor 10 also has a microcontroller 92 which includes a controller for the battery sensor 10 and an evaluation circuit for evaluating the value of the recording device, as well as terminals 94 of the vehicle electronics.
The microcontroller 92 also stores the dependency between the voltage, current and temperature of the electronic components, in particular in the form of a performance map. This dependency is stored in the form of a diode characteristic diagram of the diode 28. In the case of a diode, the voltage drop across the diode will vary with temperature, where the rate of temperature change is proportional to the change in voltage drop. The diode characteristic diagram shows the relationship between current and voltage drop at different temperatures. That is, the characteristic curve of the performance map defines the relationship between the current flowing through the diode and the voltage drop across the diode at a particular temperature. Such a dependence or a dependence between voltage, current and temperature may also be formed for any other electronic component 28 and stored in the controller.
The current is typically plotted on a logarithmic scale with respect to the voltage, which means that the characteristic curves are approximately linear and parallel to each other over the relevant operating range (see fig. 2).
If switch 76 is open, no current flows through connection 74, so that only operating current 22 flows through feed line 24. If the switch 76 Is closed, an additional measuring current Is, which depends on the resistance of the resistors 60, 70, 72, 78, 80, 84, 86, 88, 90, flows through the connection and thus also through the feed line 24. The resistances of the resistors 60, 70, 72, 78, 80, 84, 86, 88, 90 are known, which means that the measured current is known.
The above-described structure of the battery sensor 10 makes it possible to test various functions of the battery sensor or various sensor parameters.
The first sensor parameter may be, for example, the operating current I1 flowing through the diode 28.
To this end, in the first state in which the switch 76 is open (that is to say the connection 74 is interrupted), the voltage drop between the contact points 32, 46, i.e. the voltage drop U1 across the electronic component 28, is measured by measuring the voltage at the first contact point 32 with the first voltage recording device 30 and the voltage at the second contact point 46 with the second voltage recording device 44.
A second state Is then established by the additional measurement current Is flowing through the electronic component 28 by the switch 76 being closed. Therefore, the current I2 flowing through the electronic component 28 in the second state Is composed of the operating current I1 and the measurement current Is (i2=i1+is). In this second state, a second voltage drop U2 between the contact points 32, 46 is measured.
Two pairs of values (I1, U1) and (I1+IS; U2) were obtained from the two measurements. Using these two pairs of values, the gradient a of the diode characteristic curve in the relevant operating range can be calculated in the diode characteristic diagram (see fig. 2). Since the magnitude of the measurement current Is and the voltage drops U1 and U2 are known, the operating current I1 can be calculated, for example, using the equation given below:
a*(U2-U1)＝log10(I2)-log10(I1)
The controller stores a limit value of the operating current I1 corresponding to the regular current consumption of the battery sensor. If the battery current I1 exceeds or falls below the stored battery current limit, then it is assumed that the current source or battery sensor is not operating properly and a fault signal is output.
Another sensor parameter may be a first battery sensor temperature of the battery sensor 10. The temperature of the electronic component 28 substantially corresponds to the temperature of the battery sensor 10. As explained above, at a defined current, the resistance of the electronic component or the voltage drop of the electronic component 28 depends on the temperature of the electronic component 28.
If the operating current I1 and the voltage drop U1 are known, a corresponding characteristic curve can be identified in the diode characteristic map, and from this the temperature of the electronic component, i.e. the diode 28, can be determined, which corresponds to the first battery sensor temperature.
The determined battery sensor temperature can likewise be compared to a limit value, wherein the limit value can be a defined temperature or a difference from the determined second battery sensor temperature. By way of example, the temperature sensor 52 is used to determine a second battery sensor temperature that is compared to the determined first battery sensor temperature.
If the limit value is exceeded, a fault signal is output.
The third sensor parameter may be the feed line resistance 26 of the battery sensor. In a state where the battery voltage is substantially constant, the voltage at the first contact 32 upstream of the electronic component 28 may be recorded in two states, i.e., when the switch is open and closed. The difference between the measured voltages Is proportional to the increased measured current Is and the feed line resistance. Since the measured current Is known, the feed line resistance can be calculated and compared with a predefined maximum value. If the measured feed line resistance is too large, a fault signal is likewise generated.
In the embodiment of the battery sensor 10 shown here, the measurement current Is applied to both sides of the measurement resistor 60 via the electrical connection 74 and the resistors 78, 80, 84, 86, 88, 90 and the contacts 66, 68. Since a measurement current is thus applied to both sides of the measurement resistor 60, the measurement current only causes a voltage change, but the voltage change generally causes only a small change in the measurement voltage drop between the contacts 66, 68 (i.e. across the measurement resistor 60).
If the connection of one of the contacts 66, 68 to the recording device for recording the voltage drop, i.e. to the differential amplifier 64, is interrupted, only the measuring current additionally applied at the respective other contact 66, 68 causes a change in the measuring voltage. In this case, the application of the measurement current Is causes a significant change in the voltage drop between the contacts 66, 68 measured by the differential amplifier. Thus, when the measurement current Is applied, a change in the voltage drop between the contacts 66, 68 may identify an incorrect operation of the current recording device. Thus, the conclusion of the failure of the current recording device is drawn from the change in the voltage drop across the measurement resistor 60 in the second state or in the change from the first state to the second state, and a failure signal can be output.
Therefore, the above-described battery sensor 10 can be used to check a plurality of functions of the battery sensor 10, and as a result, the reliability of the battery sensor 10 and its measurement is improved.
The structure of the battery sensor 10 may also be changed if it is intended to check only some of the functions or battery parameters listed above.
In the embodiment shown here, the measurement current Is generated by closing the switch 76 and thus forming the electrical connection 74 via the resistors 60, 70, 72, 78, 80, 84, 86, 88, 90. However, it Is only necessary to apply a measurement current Is of a known magnitude to the electronic component 28. This may also be generated and applied to the electronic component 28 in any other manner.
By way of example, if it is not necessary to inspect the current recording apparatus 64, at least some of the resistors 78, 80, 84, 86, 88, 90 may be omitted. Only the electrical connection 74 needs to be provided via which the measurement current Is can flow.
As an alternative to the two voltage recording devices 44, 30, the battery sensor 10 may also have only one voltage recording device, which is connected alternately in each case to the first contact point and the second contact point, in order to record the first voltage drop and the second voltage drop. Thus, for example, systematic errors in the measurements, for example offset errors of the voltage recording device, can be compensated for, since these errors occur to the same extent in both measurements, and therefore cancel out when the voltage drop is subtracted.
Claims (21)
1. A method for testing a battery sensor (10), wherein the battery sensor (10) has at least one recording device (50, 30, 62) for recording battery parameters, an evaluation circuit (92) for evaluating the at least one recorded battery parameter, and a current source (20) for the battery sensor (10), wherein a feed line for an operating current I1 of the current source (20) has electronic components (28), the voltage and the current dependence on temperature of which are stored in a controller of the battery sensor, the method having the following steps:
a) In a first state in which only the operating current I1 flows through the electronic component (28), a first voltage drop U1 between a first contact point (32) upstream of the electronic component (28) and a second contact point (46) downstream of the electronic component (28) is determined,
B) Then, in a second state in which the sum I1+is of the operating current I1 and the defined additional measuring current Is flows through the electronic component (28), a second voltage drop U2 between the first contact point (32) upstream of the electronic component (28) and the second contact point (46) downstream of the electronic component (28) Is determined,
C) Determining the operating current I1 flowing through the electronic component (28) on the basis of the recorded first voltage drop U1, the recorded second voltage drop U2 and the known additional measuring current Is,
D) At least one sensor parameter is determined from the determined operating current I1,
E) Comparing the at least one sensor parameter with at least one limit value;
f) If the sensor parameter exceeds and/or falls below at least one limit value, a fault signal is output,
Wherein the electronic component (28) is a diode.
2. Method according to claim 1, characterized in that the at least one sensor parameter is the current consumption of the battery sensor (10) itself and the at least one limit value is the maximum current consumption of the current source (20).
3. The method according to any one of claims 1 and 2, wherein the at least one sensor parameter is a first battery sensor temperature determined from the determined voltage, the determined current and a dependency between the voltage and current of the electronic component (28) and the temperature.
4. A method according to claim 3, characterized in that the battery sensor (10) has an internal temperature sensor (52) by means of which a second battery sensor temperature is determined, which is compared with the first battery sensor temperature, wherein the at least one limit value defines a maximum difference between the first battery sensor temperature and the second battery sensor temperature.
5. A method according to any one of claims 1, 2, 4, characterized in that a sensor parameter is the feed line resistance (26) of the current source (20).
6. The method according to any one of claims 1,2,4, characterized in that the battery sensor (10) has a voltage recording device which is alternately connected to the first contact point (32) and the second contact point (46) in order to record the first voltage drop and the second voltage drop.
7. The method according to any one of claims 1, 2,4, characterized in that the battery sensor (10) has a first voltage recording device (30) and a second voltage recording device (44), wherein the first voltage recording device (30) is connected to the first contact point (32) and the second voltage recording device (44) is connected to the second contact point (46), wherein the voltages at the first contact point (32) and at the second contact point (46) are recorded simultaneously.
8. The method according to claim 7, wherein the first voltage recording means (30) records the battery voltage.
9. The method according to claim 7, characterized in that the second voltage recording means (44) are alternately connected to the second contact point (46) and to a temperature sensor (52).
10. The method according to claim 7, characterized in that a relative error of the first voltage recording means (30) and the second voltage recording means (44) is determined from the first voltage and the second voltage determined in the second state.
11. The method according to any one of claims 1, 2, 4, characterized in that the second state is formed by forming an electrical connection (74) between the current source (20) and the battery (12), wherein at least one resistor (78, 80, 84, 86, 88, 90) having a known resistance is arranged in series between the current source (20) and the battery (12).
12. Method according to claim 11, characterized in that the battery sensor (10) has a current recording device (62) with a measuring resistor (60) and a recording device (64) for recording a voltage drop across the measuring resistor (60), which recording device is in contact with a first contact (66) upstream of the measuring resistor (60) and a second contact (68) downstream of the measuring resistor (60), wherein a fault message is output if the voltage drop exceeds a limit value in the second state.
13. The method according to any one of claims 1, 2, 4, characterized in that the dependency between the voltage and the current of the electronic component (28) and the temperature is a diode characteristic diagram.
14. Battery sensor for registering at least one battery parameter, the battery sensor having at least one registering means for registering a battery parameter, an evaluating circuit for evaluating the at least one registered battery parameter, and a current source for the battery sensor, wherein a feed line for an operating current of the current source has a diode, wherein the battery sensor has means for forming the second state, at least one registering means (30, 44) and a controller (92) in which an additional measuring current Is flows through the diode, and the at least one registering means Is used for registering a voltage drop between a first contact point (32) upstream of the diode (28) and a second contact point (46) downstream of the diode (28), the controller being used for carrying out the method according to one of the preceding claims.
15. The battery sensor of claim 14, wherein at least one sensor parameter is a first battery sensor temperature determined from the determined voltage, the determined current, and a dependency between the voltage and current of the diode (28) and temperature, the battery sensor having an internal temperature sensor (52) by which a second battery sensor temperature is determined, wherein the controller (92) is capable of comparing the second battery sensor temperature with the first battery sensor temperature and outputting a fault signal if a maximum difference between the first battery sensor temperature and the second battery sensor temperature is exceeded.
16. The battery sensor according to any one of claims 14 and 15, characterized in that the battery sensor (10) has a voltage recording device which can be alternately connected to the first contact point (32) and the second contact point (46) in order to record the first voltage drop and the second voltage drop.
17. The battery sensor according to any one of claims 14 and 15, characterized in that the battery sensor (10) has a first voltage recording device (30) and a second voltage recording device (44), wherein the first voltage recording device (30) is connected to the first contact point (32) and the second voltage recording device (44) is connected to the second contact point (46).
18. The battery sensor according to claim 17, wherein the first voltage recording means (30) records the battery voltage.
19. Battery sensor according to claim 17, characterized in that the second voltage recording means (44) can be alternately connected to the second contact point (46) and the temperature sensor (52).
20. Battery sensor according to any of claims 14 and 15, characterized in that an electrical connection (74) can be made between the current source (20) and the battery (12), wherein at least one resistor (78, 80, 84, 86, 88, 90) of known resistance is arranged in series between the current source (20) and the battery (12).
21. Battery sensor according to any of claims 14 and 15, characterized in that the battery sensor (10) has a current recording device (62) with a measuring resistor (60) and a recording device (64) for recording the voltage drop across the measuring resistor (60), which recording device is in contact with a first contact (66) upstream of the measuring resistor (60) and a second contact (68) downstream of the measuring resistor (60).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019217376.4A DE102019217376A1 (en) | 2019-11-11 | 2019-11-11 | Procedure for testing a battery sensor and battery sensor |
| DE102019217376.4 | 2019-11-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112858934A CN112858934A (en) | 2021-05-28 |
| CN112858934B true CN112858934B (en) | 2024-09-06 |
Family
ID=75584173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011229264.6A Active CN112858934B (en) | 2019-11-11 | 2020-11-06 | Method for testing a battery sensor, and battery sensor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112858934B (en) |
| DE (1) | DE102019217376A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426537A (en) * | 2000-06-21 | 2003-06-25 | 布劳恩有限公司 | Method and circuit for measuring voltage or temperature and for generating voltage with any predeterminable temperature dependence |
| CN105322601A (en) * | 2014-06-04 | 2016-02-10 | 罗伯特·博世有限公司 | Battery system |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6400163B1 (en) * | 1999-09-08 | 2002-06-04 | Rolf Melcher | Circuit arrangement for monitoring an electronic switch controlling a load |
| JP4715253B2 (en) * | 2005-03-17 | 2011-07-06 | トヨタ自動車株式会社 | Power supply system monitoring device |
| DE102005013450A1 (en) * | 2005-03-23 | 2006-09-28 | Robert Bosch Gmbh | security system |
| JP2007322234A (en) * | 2006-05-31 | 2007-12-13 | Denso Corp | Failure detection device for current sensor for in-vehicle electric power source, and charging control device for vehicle |
| JP2009168531A (en) * | 2008-01-11 | 2009-07-30 | Mitsubishi Heavy Ind Ltd | Device for diagnosing operation state of external control means |
| WO2009097469A1 (en) * | 2008-01-29 | 2009-08-06 | Leviton Manufacturing Co., Inc. | Self testing fault circuit interrupter apparatus and method |
| US8717033B2 (en) * | 2010-09-21 | 2014-05-06 | Maxim Integrated Products, Inc. | Integrated MOSFET current sensing for fuel-gauging |
| JP2015192582A (en) * | 2014-03-28 | 2015-11-02 | トヨタ自動車株式会社 | Current sensor failure detection device |
| ITUB20159266A1 (en) * | 2015-12-18 | 2017-06-18 | Magneti Marelli Spa | Electronic device, system and method for measurements of insulation resistance, with self-diagnosis 5 functions and diagnosis of loss of insulation of an electric apparatus energized with respect to ground. |
| DE102015225856B4 (en) * | 2015-12-18 | 2024-11-28 | Audi Ag | Charging device and charging method for a high-voltage battery of a motor vehicle |
| DE102016202761A1 (en) * | 2016-02-23 | 2017-08-24 | Continental Automotive Gmbh | Battery system with a voltage compensation circuit, method for detecting a fault condition of the voltage compensation circuit and the cell voltage measurement |
| KR102565348B1 (en) * | 2017-12-18 | 2023-08-16 | 현대자동차주식회사 | Charging system with sensor diagnosis function and method for diagnosing sensor applied to the same |
-
2019
- 2019-11-11 DE DE102019217376.4A patent/DE102019217376A1/en active Pending
-
2020
- 2020-11-06 CN CN202011229264.6A patent/CN112858934B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1426537A (en) * | 2000-06-21 | 2003-06-25 | 布劳恩有限公司 | Method and circuit for measuring voltage or temperature and for generating voltage with any predeterminable temperature dependence |
| CN105322601A (en) * | 2014-06-04 | 2016-02-10 | 罗伯特·博世有限公司 | Battery system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019217376A1 (en) | 2021-05-12 |
| CN112858934A (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9234943B2 (en) | Method and system for battery current measurement calibration | |
| US6556019B2 (en) | Electronic battery tester | |
| US8305035B2 (en) | Energy storage device | |
| US9322871B2 (en) | Current measurement circuit and method of diagnosing faults in same | |
| US11280844B2 (en) | Device and method for monitoring a reliability of a cell impedance measurement of a battery cell | |
| CN109946510A (en) | The method and battery sensor of load current for identification | |
| CN111044768B (en) | Method for operating a current sensor and current sensor | |
| US5416470A (en) | Contact judging circuit and contact judging method for impedance measuring apparatus | |
| CN112216882A (en) | Method of operating a battery management system, corresponding device and vehicle | |
| CN112858934B (en) | Method for testing a battery sensor, and battery sensor | |
| CN111044913B (en) | Method for operating a battery sensor and battery sensor | |
| US12392836B2 (en) | Battery sensor | |
| US7276901B2 (en) | Method for shunt detection in sensors | |
| CN111044910B (en) | Method for operating a battery sensor and battery sensor | |
| KR102717953B1 (en) | How to diagnose exhaust gas sensor | |
| CN111123106B (en) | Sensor and method for checking a sensor | |
| US9797958B2 (en) | Monitoring system | |
| JP7677369B2 (en) | Insulation resistance inspection device and insulation resistance inspection method | |
| JP3964654B2 (en) | Electrical circuit diagnostic equipment | |
| CN112714873A (en) | Battery sensor for measuring current independently of temperature using a shunt | |
| JP7234414B2 (en) | How to Determine the Internal Resistance of the Electrochemical Cell of a Ceramic Exhaust Gas Sensor | |
| US12379422B2 (en) | Insulation resistance testing device and insulation resistance testing method | |
| RU68690U1 (en) | DEVICE FOR TEMPERATURE MEASUREMENT | |
| CN117805614A (en) | Insulation resistance inspection device and insulation resistance inspection method | |
| SU541225A1 (en) | Device for measuring battery electrical energy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230110 Address after: Hannover Applicant after: Continental Automotive Technology Co.,Ltd. Address before: 9 Valen Ward street, Hannover, Germany Applicant before: CONTINENTAL AUTOMOTIVE GmbH |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |