EP3405798A1 - Insulation measurement for a battery system - Google Patents
Insulation measurement for a battery systemInfo
- Publication number
- EP3405798A1 EP3405798A1 EP17700957.8A EP17700957A EP3405798A1 EP 3405798 A1 EP3405798 A1 EP 3405798A1 EP 17700957 A EP17700957 A EP 17700957A EP 3405798 A1 EP3405798 A1 EP 3405798A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrical
- battery
- connecting line
- flowing
- insulation
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
-
- 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
Definitions
- the invention relates to a circuit arrangement for monitoring the electrical insulation in a battery system according to the preamble of patent claim 1.
- circuitry is useful with a battery and / or system where insulation is to be evaluated in terms of electrical ground potential.
- circuit arrangement in a motor vehicle is useful with a battery and / or system where insulation is to be evaluated in terms of electrical ground potential.
- Such a battery system has a battery which comprises at least one battery and / or battery cell, and in each case one standing with the positive pole and the negative pole of the battery in electrical connection supply line. These supply lines are provided for electrical connection with at least one electrical load and thus serve to supply electrical energy to the electrical load. With the aid of the circuit arrangement, the electrical insulation in such a battery system can then be detected with respect to ground. There is a need to provide a reliable circuit arrangement therefor.
- the invention is based on the object, a reliable working
- this circuit should be configured in a simple manner. This object is achieved in a generic circuit arrangement for monitoring the electrical insulation in a battery system by the characterizing features of claim 1.
- a first connecting line in which an electrical resistance is arranged, is provided from the one supply line to ground. Furthermore, a second connecting line, in which a further electrical resistance is arranged, provided from the other supply line to ground. Finally, a measuring device is provided for measuring the respective electrical current flowing in the two connecting lines, such that the quality or the quality of the electrical insulation can be determined on the basis of the size of the flowing electrical currents. In particular, this is the change in the quality of electrical insulation based on the change in the size of the two
- Circuit arrangement is advantageously simple in design, in particular, the electrical resistors are each a non-variable electrical resistance with a fixed resistance, which is inexpensive.
- Embodiments of the invention are the subject of the dependent claims.
- Connecting line flowing electrical current measure the voltage drop as a measured value at the located in the respective connecting line electrical resistance.
- the size of the electrical resistors may be selected such that only a small electrical current in the manner of a test current in the
- the measuring device operates with low power.
- this may be the size of the electrical resistors in the mega-ohm range, i. at least one mega ohms (1 ⁇ ).
- the differential amplifier can be operated in a simple manner by means of adapted electrical voltage from the supply lines be. This feeds the differential amplifier system from two independent potential-free supply voltages, which are adapted to the variable plus and minus levels of the battery.
- the differential amplifier may comprise at least one operational amplifier and / or a diode with an optocoupler, which is also inexpensive.
- the erfmdungswashe circuitry is particularly suitable for a motor vehicle, which has a body, wherein in and / or on the body, a battery system is arranged.
- the body forms the electrical ground potential for the
- the circuit arrangement then serves to monitor the electrical insulation in the battery system relative to the body. Damage to the electrical insulation can be determined with the help of the circuit arrangement and it can then take appropriate measures in a timely manner. As a result, the safety of the user of the motor vehicle is ensured, especially in a high-voltage system in
- Motor vehicle for example in an electric vehicle.
- the invention further provides a method for monitoring the electrical isolation in a battery system with respect to an electrical ground potential, wherein the battery system comprises a battery comprising at least one battery and / or battery cell.
- the battery system comprises one with the positive pole and the negative pole of the battery in electrical connection standing supply line, wherein the
- Supply lines are provided for electrical connection with at least one electrical load.
- a first connecting line in which an electrical resistance is arranged, is provided from the one supply line to ground.
- a second connecting line in which an electrical resistance is arranged, is provided from the one supply line to ground.
- Connecting line in which a further electrical resistance is arranged, provided from the other supply line to ground. It will be in the two
- the quality or the quality of the electrical insulation can be determined in a simple manner on the basis of the size of the flowing electrical currents.
- the change in the quality of the electrical insulation can be determined from the change in the magnitude of the flowing electrical currents in the two connecting lines.
- the electrical current flowing in one connecting line and then in the other connecting line can first be measured in an alternating manner. In a simple way can to
- Measurement of the current flowing in the connecting line electrical current of the voltage drop can be determined as a measured value at the located in the respective connecting line electrical resistance.
- the differential amplifier can be operated by means of adaptive electrical voltage from the supply lines.
- the differential amplifier may comprise at least one operational amplifier and / or a diode with an optocoupler.
- a test current is permanently enabled by the positive line to ground and / or the negative line to ground. As soon as a deterioration in the insulation values occurs, the insulation value can be evaluated immediately.
- the amplifier system for example a differential amplifier system, is fed by two independent potential-free supply voltages, which are adapted to the variable plus levels and / or minus levels.
- variable plus potential and / or the variable negative potential is
- the differential amplifier system consists for example of accurate
- Blocks can be designed so that a meaningful evaluation and / or evaluation of the insulation is guaranteed.
- the differential amplifier system can also be realized by simple optocouplers.
- a current-carrying diode gives a galvanically isolated signal to a receiver.
- terminal 31 or to the ground potential is realized via a galvanic isolation.
- the solution according to the invention is to generate an electrical measuring current of the plus potential and / or the minus potential via the terminal 31 in the vehicle in a predetermined sequence. Depending on the size of this electrical current, the quality of the insulation can be assessed on the basis of this current.
- Fig. A circuit arrangement for monitoring the electrical insulation in a battery system.
- the battery system of the vehicle 11 shown in the figure has, in a known manner, a battery comprising at least one battery and / or battery cell.
- a supply line 2 is in electrical connection with the positive pole of the battery and a supply line 3 with the negative pole of the battery.
- the supply lines 2, 3 are connected to at least one electrical load, which is not shown, in electrical connection and thus serve to supply the
- the battery system is arranged in and / or on the body of the motor vehicle 11, wherein the body 11 forms the electrical ground potential 4 for the battery system.
- the circuit arrangement 1 for monitoring the electrical insulation of the supply lines 2, 3 with respect to the mass 4 is arranged in electrical connection with the two supply lines 2, 3 and has an electrical connection to the ground line 4.
- a first connecting line 5, in which a first electrical resistor 7 is arranged is provided by the one supply line 2 to the ground 4.
- a second connecting line 6, in which a further second electrical resistance 8 is arranged is provided from the other supply line 3 to the mass 4.
- the electrical resistors 7, 8 are non-variable resistors, each having a fixed resistance.
- a measuring device 12 is also provided for alternately measuring the electrical current 13, 14 respectively flowing in the two connecting lines 5, 6, such that the quality and / or quality of the electrical insulation can be determined on the basis of the size of the flowing electrical currents 13, 14.
- the method for monitoring the insulation in the battery system consists in that the electrical current 13, 14 flowing in the two connecting lines 5, 6 is measured alternately. Is the isolation of the supply line 3 and / or 2 in order, then flows a certain, preferably low current over the
- Connecting line 5 If the supply line 3 and / or 2 but damaged, so flows due to the short circuit caused by the mass 4 of the vehicle 11, a noticeably changed fault current 13 via the connecting line 5. This flowing through the resistor 7 fault current 13 is then measured. The height and / or size of the fault current 13 flowing in the connecting line 5 is evaluated for determining the insulation of the supply line 3 and / or 2, that is to say of the insulation resistance 17 and / or 18 of the supply line 3 and / or 2.
- a possible fault current 14 can be measured via the electrical resistance 8 in the connecting line 6, if the supply line 2 and / or 3 is damaged, from which again the insulation resistance 18 and / or 17 of the supply line 2 and / or 3 can be determined .
- the insulation resistance 18 and / or 17 of the supply line 2 and / or 3 can be determined .
- the change in the quality and / or quality of the electrical insulation of the supply lines 2, 3 can be determined on the basis of the temporal change in the size of the flowing electrical currents 13, 14 in the connecting lines 5, 6.
- a possible damage to the insulation of the supply lines 2, 3 can be detected in good time, so that appropriate safety measures can be initiated before a risk to the user of the motor vehicle 1 1 occurs.
- the measuring device 12 measures the voltage drop as a measured value at the non-variable electrical resistance 7, 8 located in the respective connecting line 5, 6 for measuring the electrical current 13, 14 flowing in the connecting line 5, 6 electrical resistance 7, 8 has a fixed
- the size of the electrical resistors 7, 8 is selected such that with intact electrical insulation of the supply lines 2, 3, only a small electric current 13, 14 flows in the manner of a test current in the Ardsleirung 5, 6, so that only a small and negligible power dissipation for the battery system results in practice.
- the size of the electrical resistors 7, 8 is in the mega-ohm range, ie, at least a 1 ⁇ .
- the supply lines 2, 3 and thus also the test currents 13, 14 are switched via the so-called terminal 31 (K131) of the ignition lock in the motor vehicle 11 and are therefore active only when the ignition is switched on, thus preventing a discharge of the battery when the ignition is switched off.
- the test currents 13, 14 are active without interruption, so that a permanent monitoring of the electrical insulation during operation of the motor vehicle 11 is made possible.
- the measuring device 12 for measuring the electrical current 13, 14 flowing in the connecting line 5, 6 comprises a differential amplifier for amplifying the
- the differential amplifier 12 again comprises at least one
- the differential amplifier 12, in particular the operational amplifiers 9, 10 are operable by means of an adapted electrical voltage from the supply lines 2, 3.
- a corresponding, connected to the supply lines 2, 3 voltage converter 19 which is in electrical communication with the operational amplifiers 9, 10 is provided.
- circuit arrangement 1 permits a permanent monitoring of the electrical insulation of the battery system.
- the detailed design is for this purpose as follows.
- Differential amplifier system 12 corresponds to the quality and / or quality of the electrical insulation, and thus to the degree of their damage.
- the differential amplifier system 12 is powered by two independent potential-free
- the variable plus potential and / or the variable negative potential are respectively for the plus measuring system on the differential amplifier system 12 and / or for the minus measuring system at the differential amplifier system 12, the reference point and thus the virtual ground.
- Vehicle level ie the potential of the terminal 31 or the ground potential, via a galvanic isolation, for example by means of the other
- Operational amplifiers 20, 21 is realized. These further operational amplifiers 20, 21 are also supplied with electrical voltage by the voltage converter 19 for their operation. The signals 22 can then, for example, in a control unit of
- Motor vehicle 11 are further processed in terms of quality and / or quality of electrical insulation.
- circuit arrangement 1 according to the invention as well as the method according to the invention for monitoring and / or measuring the insulation is particularly suitable for use with a
- Method according to the invention are also used in battery systems in household appliances, audio equipment, video equipment, telecommunications equipment or the like, and consequently in all battery systems in which the insulation is to be evaluated.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016000463 | 2016-01-20 | ||
PCT/EP2017/050978 WO2017125434A1 (en) | 2016-01-20 | 2017-01-18 | Insulation measurement for a battery system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3405798A1 true EP3405798A1 (en) | 2018-11-28 |
Family
ID=57860860
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17700957.8A Withdrawn EP3405798A1 (en) | 2016-01-20 | 2017-01-18 | Insulation measurement for a battery system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3405798A1 (en) |
DE (1) | DE102017000410A1 (en) |
WO (1) | WO2017125434A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007046483B4 (en) * | 2007-09-28 | 2014-02-27 | Continental Automotive Gmbh | Circuit arrangement and method for monitoring electrical insulation |
US9024639B2 (en) * | 2011-03-31 | 2015-05-05 | Elite Power Solutions Llc | Ground fault detection system |
JP6038899B2 (en) * | 2011-06-01 | 2016-12-07 | コミサリア ア レネルジ アトミク エ オウ エネルジ アルタナティヴ | Power supply |
-
2017
- 2017-01-18 EP EP17700957.8A patent/EP3405798A1/en not_active Withdrawn
- 2017-01-18 WO PCT/EP2017/050978 patent/WO2017125434A1/en active Application Filing
- 2017-01-18 DE DE102017000410.2A patent/DE102017000410A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE102017000410A1 (en) | 2017-07-20 |
WO2017125434A1 (en) | 2017-07-27 |
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