CN104950175B - Method for testing an insulation arrangement - Google Patents
Method for testing an insulation arrangement Download PDFInfo
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- CN104950175B CN104950175B CN201510220757.6A CN201510220757A CN104950175B CN 104950175 B CN104950175 B CN 104950175B CN 201510220757 A CN201510220757 A CN 201510220757A CN 104950175 B CN104950175 B CN 104950175B
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- 238000009413 insulation Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 title abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 41
- 238000004590 computer program Methods 0.000 claims abstract description 8
- 230000003071 parasitic effect Effects 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000011156 evaluation Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
- B60L1/02—Supplying electric power to auxiliary equipment of vehicles to electric heating circuits
- B60L1/04—Supplying electric power to auxiliary equipment of vehicles to electric heating circuits fed by the power supply line
- B60L1/06—Supplying electric power to auxiliary equipment of vehicles to electric heating circuits fed by the power supply line using only one supply
- B60L1/08—Methods and devices for control or regulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/21—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having the same nominal voltage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/60—Navigation input
- B60L2240/66—Ambient conditions
- B60L2240/662—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/60—Navigation input
- B60L2240/66—Ambient conditions
- B60L2240/667—Precipitation
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- 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
- G01R31/3865—Arrangements for measuring battery or accumulator variables related to manufacture, e.g. testing after manufacture
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a method for testing the insulation resistance of an insulation arrangement of a battery, wherein a measurement voltage is applied to the insulation arrangement, wherein a total current profile (28, 30) is measured within a set measurement time interval (Δ t), and the total current profile (28, 30) measured within the set measurement time interval (Δ t) is compared with a reference current profile. Furthermore, the invention relates to a computer program and a system for performing the method.
Description
Technical Field
The invention relates to a method for testing the insulation resistance of an insulation arrangement of a battery pack. The invention also relates to a computer program and a system for carrying out the method.
Background
High-voltage modules are used in rechargeable battery packs for electric or hybrid vehicles, which must be insulated from other modules, for example low-voltage modules and the environment. Failure of the insulation is a high safety risk and can lead to damage to the battery pack. During the production of the battery pack and in particular the high-voltage component of the battery pack, the functional capability of the insulation arrangement is therefore already checked in order to identify a damaged insulation arrangement as early as possible in the production process or in the operation of the battery pack.
In order to test the insulation arrangement, the insulation resistance is usually measured, which is correspondingly high when the insulation arrangement is in operation. For this purpose, a measuring voltage is applied to the insulation device, the current flowing through the measuring device is measured and the insulation resistance is determined. Because the measured current includes different components having different lengths of decay time, such measurements may take several minutes.
DE 102010006108 a1 discloses a device for determining the insulation in an insulated earth system (IT: Isolated Terra, ungrounded grid) of a high-voltage network in a hybrid or electric vehicle. The device comprises a resistor which can be connected to a current supply conductor of the insulated earth system by means of a switch. After the switch is closed, the signal profile is recorded, the recorded signal profile is compared with a predefined signal profile, and an insulation fault is determined if necessary.
DE 102006031663B 3 describes a method for measuring the insulation resistance in an insulated earth network with a dc intermediate circuit and at least one self-conducting rectifier with at least one first and one second circuit breaker. By means of the method, off-line and on-line measurements can be carried out, wherein different potentials are measured and the insulation resistance is determined therefrom. In addition, for monitoring the insulation measuring device, the oscillation-starting process of the potential measurement is used due to the parasitic load capacitance.
DE 10106200C 1 relates to a method for insulation monitoring of an ungrounded direct-current or alternating-current power supply system having a pulsed alternating voltage which is coupled in via an ohmic power supply system coupling between the power supply system and the earth and which alternates in magnitude and duration. In this case, the measurement current in the oscillation start state is detected and the ohmic insulation resistance is determined from the difference between two successive measured values of the measurement current flowing through.
In particular, it is desirable to test the insulation arrangement quickly and reliably during the production process and during operation of the high-voltage component. There is therefore a constant interest in improving the inspection methods of insulating devices.
Disclosure of Invention
According to the invention, a method for testing the insulation resistance of an insulation device of a battery pack is proposed, wherein a measuring voltage is applied to the insulation device, wherein the total current profile measured in a set measuring time interval is compared with a reference current profile.
By comparing the total current profile measured in a set measuring time interval with the reference current profile, the functional capability of the insulation arrangement can already be determined after a short measuring time interval.
The total current profile represents the profile of the total current over time, which includes a parasitic current component in addition to the leakage current of the insulating device. The leakage current indicates a fault current of the insulating device. For example, the parasitic current component includes a capacitance current component and a sink current component. In particular, the parasitic component decreases exponentially, the exponential decrease being characterized by a decay rate. The decay rate or equivalent decay time may likewise be different for different spurious components. Thus, after the decay time, the total current variation course is determined by the substantially constant leakage current of the insulation means. By substantially constant it is meant that the leakage current may have a fluctuation in the range of 0.1% to 5% of the average leakage current.
The capacitive current component of the total current represents, in particular, the current flowing during the capacitive charging between a high-voltage range and a low-voltage range, which are preferably electrically separated from one another. Here, the initial value of the capacitance current component may be higher than the initial value of the sink current component and the magnitude of the leakage current. The additional capacitive current component may have a higher decay rate or a shorter decay time than the sink current component. For example, the decay time is between 0.1s and 1 s.
The absorbed current component represents in particular the current flowing as a result of the reorientation of the molecules forming the dielectric between the high-voltage range and the low-voltage range in the insulating material of the insulating device. Here, the initial value of the sink current component may be smaller than the initial value of the capacitance current component and larger than the magnitude of the leakage current. The sink current component may additionally have a smaller decay rate or a longer decay time than the capacitive current component. For example, the decay time is between 1s and 10 s.
In one embodiment, the total current profile is measured within a set measuring time interval which is less than the decay time of at least one parasitic current component, in particular the sink current component and/or the capacitance current component. The measurement time of the total current change is preferably 10s or less than 10s, particularly preferably 5s or less than 5s, very particularly preferably 1s or less than 1 s.
In a further embodiment, the reference current course is measured at least until such time as the reference current course is substantially determined by the leakage current and is thus substantially constant. In other words, the reference current profile can be measured up to the point in time at which the parasitic current component has substantially decayed and thus the overall current profile is substantially constant. By substantially constant is here meant that the total current variation may have a fluctuation in the range of 0.1% to 10%. The reference leakage current and the reference profile for the parasitic current component, in particular the sink current component and/or the capacitance current component, can thus be determined from the reference current profile.
In a further embodiment, the reference current profile is measured for a single battery configuration and stored in a memory for a battery of this battery configuration. Here, the battery pack structural form denotes different implementations of battery cells interconnected in series or in parallel as a battery pack. In this context, the battery configuration represents the implementation of the various components of the battery, in particular of the battery cells which influence the insulation and thus the course of the reference current change. Different cell configurations are known to the person skilled in the art of batteries or accumulators. For example, rolled or stacked battery cells are used in different sizes for such a battery pack. The insulating means may also comprise different materials. Furthermore, the battery pack may also differ in chemical composition inside the battery cells. For example, lithium ion battery cells or nickel metal mixture battery cells are used in the automotive field.
In a further embodiment, the reference current profile is determined under different measurement conditions, and the measurement conditions are determined during the measurement of the total current profile. Thereby, the measurement conditions can be taken into account when evaluating the insulation arrangement. This ensures that the reference current profile and the total current profile are measured under substantially the same measurement conditions. The measurement conditions include, in particular, humidity, such as relative air humidity, or temperature. Here substantially constant includes a deviation of the measurement conditions in the range of 1% to 10%. Additionally, interpolation may be performed between reference measurements using different measurement conditions. For example, the reference current course can be determined under different measurement conditions, for example at 40%, 50% and/or 60% relative air humidity, while other reference current courses are interpolated, for example at 45%, 55% and/or 65% relative air humidity. In measuring the course of the total current change, measurement conditions such as humidity and temperature can be measured. In the testing of the insulation arrangement, reference current profiles or interpolated reference current profiles corresponding to these measurement conditions can be taken into account.
In a further embodiment, reference current variations are taken into account within the set measuring time interval, which is, for example, between 0.1s and 10 s. The set measuring time interval is preferably selected such that the reference current profile at least partially contains capacitive and absorption current components.
In a further embodiment, the insulation arrangement is evaluated on the basis of the total current profile and the reference current profile within the set measuring time interval. The total current profile within the set measuring time interval, the displacement of which relative to the reference current profile gives the leakage current, can thus be compared with the reference current profile.
In a further embodiment, the insulation device is judged to be functional when the displacement of the total course of current change in the set measuring time interval relative to the course of reference current change in the set measuring time interval is equal to or less than a defined current limit value. In a further embodiment, the insulation device is evaluated as inoperable if the displacement of the total course of current change in the set measuring time interval relative to the course of reference current change in the set measuring time interval is greater than a defined current limit value.
Furthermore, according to the invention, a computer program is proposed, according to which one of the methods described herein is executed when the computer program is executed on a programmable computer device. For example, a computer program may refer to a module, routine, or subroutine for implementing a system for inspecting an insulation device. The computer program may be stored on a machine-readable storage medium, for example on a permanent or rewritable storage medium or distributed to a computer device, for example on a portable memory such as a CD-ROM, DVD, USB stick, blu-ray disc or memory card. Additionally or alternatively, the computer program may be provided on a computer device such as a server or cloud server for downloading, for example via a data network such as the internet, a cloud server or a communication connection such as a telephone line or wireless connection.
Furthermore, according to the invention, a system for testing an insulation device in a battery pack is proposed, comprising a unit for applying a measurement voltage and a unit for measuring a total current profile, wherein the system additionally comprises a unit for measuring the total current profile within a set measurement time interval and an evaluation unit for evaluating the state of the insulation device, wherein the evaluation unit is designed to compare the total current profile measured within the set measurement time interval with a reference current profile.
The system for testing an insulation device is particularly suitable for testing high-voltage components in a battery pack, as is used in particular in hybrid or electric vehicles. Such a high-voltage component is electrically insulated by the insulating device, for example with respect to ground, for example with respect to a housing or a cooling plate of the battery pack. As a high-voltage component, the battery pack comprises, for example, a plurality of battery cells or accumulator cells and a current-conducting component, such as a busbar, a high-voltage cable or a high-voltage protection device.
THE ADVANTAGES OF THE PRESENT INVENTION
The invention makes it possible to check the functional capability of the insulation arrangement within a short measuring time in the range of a few seconds. The functional capability and quality of the insulation device can thus be reliably determined, in particular already after a few seconds. In addition, after a short measurement time, the leakage current and thus the insulation resistance can already be quantitatively determined.
The time saving plays a positive role, especially when the inspection of the insulation arrangement has to be carried out regularly. Such tests are therefore often carried out after each production step in which high-voltage components are involved, in the production of safety-critical products, in particular battery packs, such as for electric or hybrid vehicles. In the operation of such safety-critical products, regular inspections of the insulation arrangement are required. This time saving makes a significantly more efficient procedure possible.
Furthermore, the present invention can be easily integrated into existing production processes or diagnostic routines without requiring significant changes to the hardware. The invention can thus be converted in the analysis unit of the checking system into software, for example in the form of a software update.
Drawings
Embodiments of the invention are illustrated in the drawings and described in greater detail in the following description.
FIG. 1 shows the total current variation process with sink current component, capacitive current component and leakage current;
FIG. 2 illustrates the total current change for both an operable and an inoperable insulation unit;
fig. 3 shows the overall current profile of the operative isolation device of the first battery type and the inoperative isolation device of the second battery type; and
fig. 4 shows an embodiment of a system for inspecting an insulation device.
Detailed Description
FIG. 1 shows schematically a current with a sink current component IabsVariation process 12, capacitive current component IkapVariation 14 and leakage current IleckTotal current of course 16 course 10.
The logarithm (Log) of the current I is plotted as a function of time t in fig. 1. In addition to the total current change process 10, the total current I is also plottedgesEach current component I ofkap，Iabs. So that the total current IgesComprising a component I with a sink current following a variation process marked with 12 and 14absAnd a capacitance current component IkapParasitic current component I ofpar. For example, sink current component IabsAnd the current of the capacitorComponent IkapGiven by decreasing exponential functions having an initial value and a decay time, respectively. In the illustrated embodiment, the capacitive current component IkapInitial value I of the variation process 14kap，0And decay time 1/kkapGreater than the absorption current component IabsInitial value I of variation process 12abs，0And decay time 1/kabs. For example, the capacitive current component IkapDecay time of 1/kkapBetween 0.1s and 1s, while absorbing the current component IabsDecay time of 1/kkapBetween 1s and 10 s. In addition, the total current IgesAnd also includes leakage current IleckThe leakage current indicates the actual fault current of the insulation device. Leakage current IleckGiven a substantially constant course 16 of the current I, this course 16 can have a fluctuation in the range from 0.1% to 5%. Thus, the total current IgesGiven by:
Iges＝Ileck+Ikap+Iabs (1)
thus, the total current IgesComprising a plurality of current components Iabs、Ikap、IleckIn which the leakage current IleckIs a value that characterizes the quality of the insulation device. When the high insulation resistance is more than 1G omega, the leakage current IleckAnd a capacitance current component IkapAnd sink current component IabsIs relatively very small. To reduce leakage current IleckThe capacitance current component I of the total current variation process 10kapAnd sink current component IabsSeparate, the total current I can always be measuredgesUp to the capacitor current component IkapAnd sink current component IabsUntil it decays. In the case of insulating materials such as films or lacquers, this may last up to several minutes.
In the case of the production of safety-critical products, such as battery packs for hybrid and electric vehicles, the insulation arrangement is often subjected to a test involving high-voltage components after each production step. The insulation arrangement is also regularly checked during the operation of such safety-critical products. Therefore, valuable time is lost, especially during the production process. In order to reduce the measuring time for testing the insulation device, the invention provides for the analysis of the total current profile 10 and the determination of the leakage current I by knowing the profile of the capacitive and absorption componentsleck。
Fig. 2 shows the total current profile 28 of the operative and the total current profile 30 of the inoperative insulation device.
The logarithm (log) of the current I in fig. 2 is plotted as a function of time t. In addition, the measurement time interval Δ t and the defined limit value I are displayedgrenz. Here, the defined limit value IgrenzRepresents the leakage current IleckFor example, depending on the battery configuration.
The total current change 28 of the working insulation means and the total current change 30 of the non-working insulation means are measured under substantially the same measurement conditions. That is, the measurement conditions, such as temperature and/or humidity, are the same for the two total current profiles 28, 30, except for a deviation of a few percent.
The sink-current component and the capacitance-current component of the two total current profiles 28, 30 are therefore similar, and the leakage current I can already be determined after the measurement time interval Δ t ≦ 10s with knowledge of the sink-current component and the capacitance-current componentleck. For this purpose, a reference current profile is provided, which is measured on the basis of reference measurements on a reference battery having the same battery configuration, for example a battery that has just been produced, under substantially the same measurement conditions.
During a measurement time interval Δ t of more than one minute, the reference current course is measured until the capacitive current component and the absorption current component decay. And calculating the variation process of the capacitance reference current component, the variation process of the absorption reference current component and the reference leakage current from the measured reference current variation process. The determined capacitance reference current component and the determined absorption reference current component are subtracted from the two total current profiles 28, 30 shown in fig. 2. Thus, the leakage current I is derived from this subtraction already after a set measurement time interval Δ t ≦ 10sleckCorresponding to the displacement. The leakage current IleckWith a defined limit value I for the current IgrenzTo determine whether the insulation unit is operable or inoperable. If the leakage current IleckGreater than the defined limit value IgrenzThe insulating device is inoperable. If the leakage current IleckEqual to or less than the defined limit value IgrenzThe insulating device can then operate.
Fig. 3 shows a total current profile 32 of an operable isolation device in a first battery configuration and a total current profile 34 of a non-operable isolation device in a second battery configuration.
The total current profile 32 of the operable insulation means of the first battery configuration and the total current profile 34 of the inoperable insulation means of the second battery configuration coincide with one another over a measurement time interval Δ t. However, the leakage current I of the total current profile 32 of the operable insulation means in the form of the first battery pack configurationleckLeakage current I of the overall current profile 34 of the inoperable insulator device, which differs from the second battery pack designleck. The reference current profile is thus determined for each of the different battery pack configurations and stored for the respective battery pack configuration, for example in a non-volatile memory of the battery pack or in the system 20 for testing the insulation device.
Fig. 4 shows an embodiment of a system 20 for checking insulation means according to the invention.
The system 20 for checking insulation devices comprises a unit 22 for applying a measuring voltage and a unit 24 for measuring the total current change process 10, 28, 30, 32, 42. The unit 24 for measuring the total current profile 10, 28, 30, 32, 42 is designed such that the total current profile 10, 28, 30, 32, 42 is measured within a time interval that is less than the decay time of the parasitic current component 12, 14. For example, the time for measuring the total current profile 10, 28, 30, 32, 42 is less than 10 s.
The system 10 for testing the insulation arrangement furthermore comprises an evaluation unit 26, which is designed to compare the measured total current profile 10, 28, 30, 32, 42 with a reference current profile for the purpose of evaluating the insulation arrangement. In this case, reference current profiles measured beforehand under substantially the same measurement conditions, for example with respect to humidity or temperature, are considered. For example, from the reference current profile, the reference leakage current, the reference profiles for the sink current component and the capacitor current component can be determined, which are taken into account in the evaluation of the total current profile 10, 28, 30, 32, 42.
The evaluation unit 26 is further designed to evaluate the insulation arrangement on the basis of the total current profile 10, 28, 30, 32, 42 and the reference current profile. In particular when the displacement between the total current profile 10, 28, 30, 32, 42 and the reference current profile is less than or equal to a defined current limit value IgrenzThe insulation device is judged to be operable. When the displacement between the total current profile 10, 28, 30, 32, 42 and the reference current profile is greater than a defined current limit value IgrenzThe insulation device was judged to be inoperable. Additionally, the evaluation unit 26 may also be designed to determine the leakage current IleckAnd corresponding insulation resistance.
The present invention is not limited to the embodiments described herein and the salient aspects thereof. But a number of variations which are obvious to a person skilled in the art can be made within the scope of what is stated in the claims.
Claims (9)
1. Method for checking the insulation resistance of an insulation means of a battery, wherein a measuring voltage is applied to the insulation means, characterized in that the total current profile (10, 28, 30, 32, 34) is measured within a set measuring time interval (Δ t), and the total current profile (10, 28, 30, 32, 34) measured within the set measuring time interval (Δ t) is compared with a reference current profile, wherein the total current comprises a leakage current and a parasitic current component of the insulation means, wherein the reference current profile is measured at least until the moment when the reference current profile is constant.
2. Method according to claim 1, characterized in that the total current course (10, 28, 30, 32, 34) is measured within a set measurement time interval which is smaller than the decay time of the at least one parasitic current component (12, 14).
3. A method according to claim 1 or 2, characterized in that the reference current profile is measured for a single battery configuration and stored in a memory for the battery in the battery configuration.
4. Method according to one of claims 1 to 2, characterized in that the reference current profile is determined under different measurement conditions and the measurement conditions are determined during the measurement of the total current profile (10, 28, 30, 32, 34).
5. Method according to one of claims 1 to 2, characterized in that the total current profile (10, 28, 30, 32, 34) over the set measuring time interval (Δ t) is compared with a reference current profile, wherein a displacement of the total current profile (10, 28, 30, 32, 34) relative to the reference current profile over the set measuring time interval (Δ t) gives the leakage current.
6. Method according to claim 5, characterized in that the displacement of the total current course (10, 28, 30, 32, 34) relative to the reference current course when in the set measuring time interval (Δ t) is equal to or less than a defined limit value (I) for the current (I)grenz) The insulation device is then rated as operable or, if the displacement of the total current profile (10, 28, 30, 32, 34) relative to the reference current profile within the specified measuring time interval (Δ t) is greater than a defined limit value (I) for the current (I)grenz) The insulation device is judged to be inoperable.
7. Method according to one of claims 1 to 2, characterized in that the leakage current and insulation resistance are determined.
8. Machine-readable storage medium, on which a computer program is stored which, when executed on a programmable computer device, causes the programmable computer device to carry out the method according to one of claims 1 to 7.
9. System (20) for checking the insulation resistance of an insulation means of a battery pack, comprising a unit (22) for applying a measurement voltage, characterized in that the system additionally comprises a unit (24) for measuring the total current profile (10, 28, 30, 32, 34) within a set measuring time interval, and an evaluation unit (26) for evaluating the state of the insulation arrangement, wherein the evaluation unit (26) is designed to compare the total current profile (10, 28, 30, 32, 34) measured within a set measurement time interval (Δ t) with a reference current profile, wherein the total current comprises leakage current and parasitic current components of said insulating means, wherein said reference current course is measured at least until a moment when said reference current course is constant.
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| DE102014205918.6 | 2014-03-31 | ||
| DE102014205918.6A DE102014205918A1 (en) | 2014-03-31 | 2014-03-31 | Method for testing an isolation device |
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| EP3425411B1 (en) * | 2016-03-03 | 2023-03-22 | Sumitomo Electric Industries, Ltd. | Method for evaluating insulation properties of insulator |
| FR3068781A1 (en) | 2017-07-06 | 2019-01-11 | Ateq | METHOD FOR DETECTING LEAKAGE OF HOLLOW PIECE AND INSTALLATION FOR IMPLEMENTING SUCH A METHOD |
| FR3073623B1 (en) | 2017-11-16 | 2019-11-08 | Ateq | INSTALLATION AND METHOD FOR DETECTING AND LOCATING A LEAK IN A FLUID TRANSPORT CIRCUIT, IN PARTICULAR AN AIRCRAFT |
| CN108279386A (en) * | 2018-02-05 | 2018-07-13 | 惠州亿纬锂能股份有限公司 | A kind of battery core screening technique |
| CN110873625B (en) * | 2018-08-31 | 2024-07-02 | 亚德克公司 | Battery leakage testing device and method |
| US11187752B2 (en) | 2018-08-31 | 2021-11-30 | Ateq Corporation | Battery leak test device and methods |
| FR3092171B1 (en) | 2019-01-29 | 2021-04-30 | Ateq | Tracer gas leak detection system and corresponding use. |
| FR3106661B1 (en) | 2020-01-28 | 2022-01-21 | Ateq | LEAK DETECTION DEVICE |
| DE102023102654A1 (en) | 2023-02-03 | 2024-08-08 | Schaeffler Technologies AG & Co. KG | Detection of faulty components in an insulation monitor |
| DE102023102653A1 (en) | 2023-02-03 | 2024-08-08 | Schaeffler Technologies AG & Co. KG | Insulation monitoring for high-voltage networks in electric vehicles |
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| DE102014205918A1 (en) | 2015-10-01 |
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