WO2009153036A1 - Contactlessly operating current-measuring arrangement for measuring a battery current - Google Patents

Contactlessly operating current-measuring arrangement for measuring a battery current Download PDF

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Publication number
WO2009153036A1
WO2009153036A1 PCT/EP2009/004376 EP2009004376W WO2009153036A1 WO 2009153036 A1 WO2009153036 A1 WO 2009153036A1 EP 2009004376 W EP2009004376 W EP 2009004376W WO 2009153036 A1 WO2009153036 A1 WO 2009153036A1
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WO
WIPO (PCT)
Prior art keywords
current
sensor
measuring arrangement
arrangement according
winding
Prior art date
Application number
PCT/EP2009/004376
Other languages
German (de)
French (fr)
Inventor
Peilei Chen
Michael Mueller
Marcus Bremmer
Ralf Koch
Original Assignee
Robert Bosch Gmbh
Vacuumschmelze Gmbh & Co. Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh, Vacuumschmelze Gmbh & Co. Kg filed Critical Robert Bosch Gmbh
Publication of WO2009153036A1 publication Critical patent/WO2009153036A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
    • 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]
    • G01R31/364—Battery terminal connectors with integrated measuring arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
    • H01R11/28—End pieces consisting of a ferrule or sleeve
    • H01R11/281—End pieces consisting of a ferrule or sleeve for connections to batteries
    • H01R11/287—Intermediate parts between battery post and cable end piece

Definitions

  • the invention relates to a non-contact current measuring arrangement for measuring a battery current.
  • so-called battery sensors are increasingly being used, which are among others. detect the current taken from or added to the battery. The measured value thus obtained is then evaluated by means of appropriate algorithms, so that the state of charge of the battery is available as part of an energy management.
  • the placement of such a battery sensor is advantageously carried out before the first branching of the circuit, and thus as close to the battery.
  • battery sensor systems known from EP 1 435 524 A1 use a shunt resistor inserted in the circuit in the vicinity of the pole shank, wherein the voltage dropping across the shunt resistor, which is proportional to the current flowing through it, is measured. Due to the principle, an electrical connection between the shunt resistor and the transmitter must be provided for this purpose.
  • the transmitter is usually mounted on a circuit board and is conveniently as close as possible to the shunt resistor. This structure requires an interface between the plastic housing of the transmitter, the
  • An arrangement according to DE 35 32 044 Al circumvents these problems by means of a contactlessly operating current sensor, in which an open magnetic circuit in conjunction with a Hall sensor element, which is arranged in an air gap of the magnetic circuit, around the current-carrying conductor placed around is ,
  • an open magnetic circuit shows a strong susceptibility to external magnetic fields and is therefore very susceptible to interference.
  • due to the remanence of the magnetic material such a system is not capable of measuring currents in the mA range.
  • the object of the invention is therefore to provide a contactless and thus potential-free operating current measuring arrangement for measuring a battery current, which has a high accuracy at low currents and can be arranged as close to the battery as possible.
  • An inventive contactless current measuring arrangement for measuring the incoming and outgoing current of a battery having at least one rod-shaped pole shaft comprises a closed ring core provided with a winding and enclosing at least one pole shank. Furthermore, an evaluation circuit is provided, which is arranged next to the Polschaft and which is electrically connected to the winding of the toroidal core. In this case, ring core, winding and evaluation circuit form a compensation current sensor, which provides a measurement signal which is proportional to the current flowing in the Polschaft current.
  • the advantage of the present invention is that a closed magnetic system is used, which is very robust against external magnetic fields and which operates without contact, so that it is less susceptible to corrosion.
  • Such magnetic circuits are also able to measure smaller currents, ie also currents in the mA range, with high accuracy and, moreover, also have a large measuring range towards higher currents.
  • By arranging the measuring arrangement on the pole rail a maximum proximity to the battery is achieved while making optimum use of the available space.
  • the arrangement can be realized as a single design so that it can be hermetically sealed with a plastic sheath and thus prevents the penetration of moisture, which can lead to the corrosion of metallic parts.
  • Another advantage is that no additional resistance is introduced into the battery circuit, whereby no additional power loss and thus no (further) heat generation is caused. In addition, the must
  • Circuit can not be separated to insert the shunt resistor, which on the one hand further reduces the susceptibility to corrosion and on the other hand allows easier installation, since the current sensor is only plugged (without electrical contact).
  • Measuring device, 3 shows an embodiment of a housing provided with a wound toroidal core
  • FIG. 4 shows the arrangement of the toroidal core of FIG. 3 on a pole rail of a battery
  • Fig. 5 shows the arrangement of FIG. 4 with additionally a housing part for receiving the evaluation electronics and
  • FIG. 6 shows a completely constructed current measuring arrangement according to the invention with additional Hall sensor for measuring range extension.
  • Fig. 1 shows in plan view the structure of a battery 1 usually used in vehicles with two poles 2 and 2 'shaped like a bar.
  • the polishes 2 and 2 ' project from a plane 3 formed by the top of the housing of the battery 1, i. in the illustration in Fig. 1 out of the plane.
  • Increased with respect to the level 3 is also formed by the upper part of the housing or Gehauseteiis the battery 1 further level 4, which is recessed in the Polschafte 2 and 2 ', so that there polish 5 and 5' are formed and the level 4 forming , compared to the level 3 increased housing parts shadow the two Polschafte 2 and 2 'at least in a straight line to each other.
  • FIG. 2 shows the electrical configuration of a current measuring arrangement according to the invention for measuring the battery current, ie the incoming and outgoing current, into the battery 1 from FIG. 1.
  • the pole shaft 2 in the Polish for the further considerations 5.
  • the pole shaft 2 in FIG. 2 is shown as being longer and narrower than in most realizations. This should be the case. However, with this illustration, the basic operating principle of the invention is better understood.
  • a closed high-permeable ring core 6 is arranged around the pole shank 2, onto which a winding 7 is applied.
  • Toroidal core 6 and winding 7 together form a magnetic module 8, which has an opening 9 surrounded by the ring core 6, through which the pole shank 2 is guided.
  • the winding 7 is finally electrically connected to an evaluation circuit 10.
  • a magnetic field sensor such as a Hall sensor element 11 (or any other sensor element suitable for detecting magnetic fields), which is likewise arranged in the vicinity of the pole shaft 2 but is magnetically independent of the magnetic module 8, is connected to the evaluation circuit.
  • the winding 7 in conjunction with the toroidal core 6 and a first evaluation device 12 together form a compensation current sensor which, depending on the design of the toroidal core 6, the winding 7 and the evaluation device 12, provides from the mA range up to the 1000 A range for current measurement can be.
  • a compensation current sensor which, depending on the design of the toroidal core 6, the winding 7 and the evaluation device 12, provides from the mA range up to the 1000 A range for current measurement can be.
  • one or more windings may also be provided.
  • a special form of compensation current sensor namely a flux gate sensor principle is used, which advantageously requires only one winding and is therefore very space-saving.
  • an additional magnetizing current is fed into the winding 7, by means of which the toroidal core 6 is periodically magnetized to the positive and negative saturation.
  • a voltage drop across the winding 7 is sampled and stored.
  • the mean value is formed from the current and a previous measured value.
  • the measurement error caused by the hysteresis of the magnetic core or the error due to the magnetization current is different due to different Sign out when the two samples are made after passing through the positive and negative saturation (or vice versa).
  • At the terminals 15 is then an analog or digital signal at your disposal, which is the current in the Polschaft 2 proportional.
  • the evaluation circuit in further development of the invention comprises a further evaluation unit 13 which, together with the Hall sensor element 11, forms a direct-imaging current sensor.
  • a direct imaging sensor the magnetic field generated by a current in a conductor is measured and closed from the magnetic field to the causal current.
  • Such current sensors are accurate only at very high current, namely, when the Stormagnetfelder are small compared to the magnetic field generated by the conductor (in the present case of Polschaftes 2).
  • a directly imaging current sensor is used in the present case, with an intelligent switching unit 14 switches in the evaluation circuit 10, for example in an overlap region of both current sensors from one to the other current sensor, this can be done, for example, including a switching hysteresis.
  • the evaluation unit 12 or the evaluation unit 13 is connected to output terminals 15 of the intelligent switching unit 14
  • Evaluation circuit 10 switched.
  • the direct-imaging current sensor is adjusted on the basis of the compensation current sensor at regular intervals (periodically) or event-controlled, ie calibrated to the compensation current sensor.
  • the advantage here is that no expensive equipment for the compensation of temperature, production and old tion-related fluctuations are necessary, which in particular require further space.
  • FIG. 3 shows the electrical module 8, which is housed in an example encapsulated housing 16 and thus is very resistant to corrosion.
  • the electrical connections of the winding 7 are led out of the housing in the form of corresponding contacts 17.
  • the housing 16 is arranged resting on the plane 3 around the pole shaft 2 within the Polish 5, so that the pole shaft 2 passes through the opening in the housing and thus through the opening in the housing 16 (and so that it is passed through the enclosed by him, not shown in Fig. 4 toroidal core).
  • a pole terminal 18 is then placed on the either a battery cable 19 is welded or soldered for connection to the electrical system of the vehicle or as shown a bolt is attached to the battery cable is detachably screwed.
  • the terminal 18 has a fferklemmver gleich 20 for their attachment to the shaft 2 on.
  • the terminal 18 extends beyond the
  • Level 4 which, as mentioned above, is higher than Level 3.
  • FIG. 5 Compared to the construction shown in FIG. 4, in the structure shown in FIG. 5, a further housing part 21 is now added, in which the entire evaluation circuit 10 is installed. For better clarity, the circuit itself is not shown in FIG. Thus, however, it can now be seen from FIG. 5 that the housing 16 of the magnetic module 8 and the housing 21 mesh with each other both mechanically and electrically. Both housings 16 and 21 are mechanically connected to each other, so that finally an unite In addition, there is no longer any need for any further electrical connection elements, since the contacts 17 of the magnetic module 8 protrude into the housing 21 and can be contacted directly there by the corresponding circuit parts in the evaluation circuit 10. However, cable connections of any length are also possible in the same way.
  • the housing 21 is arranged between the pole shaft 2 and the housing parts of the battery 1 defining the plane 4 in the recess 5, so that the space still available in the recess 5 is utilized without protruding beyond the plane 4.
  • FIG. 6 shows a completely constructed contactless current measuring device, wherein the housing 26 is open for purposes of illustration, but may be hermetically sealed and / or molded in use in order to minimize the possibility of interference and corrosion.
  • the housing contains an electrically insulating support provided with structured metallizations, namely a circuit board 22 on which electrical components 23 are arranged and electrically contacted with one another and which form the evaluation circuit 10.
  • the Hall sensor element 11 is arranged in the housing, and as close to the pole terminal 18.
  • an arrangement of the Hall element at any other point at which a current flow through the Polschaft proportional magnetic field is measurable within and outside the housing 21 or the housing 16 conceivable.
  • the attachment of the inventive measuring arrangement takes place in the exemplary embodiment in that the structural unit of the measuring arrangement is firmly connected to the pole terminal 18 and thus clamped together with this on the pole shaft 2.
  • the attachment can also be done in different ways.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Secondary Cells (AREA)

Abstract

Contactlessly operating current-measuring arrangement for measuring the current flowing into and away from a battery (1) which has at least one rod-shaped pole shank (2) and comprises a closed toroidal core (6) which is provided with a winding (7) and surrounds the at least one pole shank (2). An evaluation circuit (10) is also provided, which evaluation circuit is arranged beside the pole shank (2) and is electrically connected to the winding (7) of the toroidal core (6). In this case, the toroidal core (6), the winding (7) and the evaluation circuit (10) form a compensation current sensor which provides a measurement signal that is proportional to the current flowing in the pole shank (2).

Description

Beschreibungdescription
Berührungslos arbeitende Strominessanordnung zur Messung eines BatteriestromesNon-contact Strominessanordnung for measuring a battery current
Die Erfindung betrifft eine berührungslos arbeitende Strommessanordnung zur Messung eines Batteriestromes.The invention relates to a non-contact current measuring arrangement for measuring a battery current.
Um beispielsweise in Fahrzeugen die Verfügbarkeit der jewei- ligen Fahrzeugbatterie zu erhöhen, werden immer häufiger so genannte Batteriesensoren eingesetzt, die u.a. den Strom, der der Batterie entnommen bzw. ihr hinzugefügt wird, erfassen. Der so erhaltene Messwert wird dann mittels entsprechender Algorithmen ausgewertet, so dass der Ladezustand der Batterie im Rahmen eines Energiemanagements zur Verfügung steht. Die Platzierung eines solchen Batteriesensors erfolgt zweckmäßigerweise vor der ersten Aufzweigung des Stromkreises, und damit möglichst nahe an der Batterie.In order to increase the availability of the respective vehicle battery in vehicles, for example, so-called battery sensors are increasingly being used, which are among others. detect the current taken from or added to the battery. The measured value thus obtained is then evaluated by means of appropriate algorithms, so that the state of charge of the battery is available as part of an energy management. The placement of such a battery sensor is advantageously carried out before the first branching of the circuit, and thus as close to the battery.
Beispielsweise aus der EP 1 435 524 Al bekannte Batteriesensorsysteme verwenden einen in der Nähe des Polschaftes in den Stromkreis eingebrachten Shunt-Widerstand, wobei die an dem Shunt-Widerstand abfallende Spannung, die proportional zu dem durch ihn fließenden Strom ist, gemessen wird. Prinzipbedingt muss dazu eine elektrische Verbindung zwischen dem Shunt- Widerstand und der Auswerteelektronik vorgesehen werden. Die Auswerteelektronik ist üblicherweise auf einer Platine angebracht und befindet sich zweckmäßigerweise so nah wie möglich am Shunt-Widerstand. Dieser Aufbau bedingt eine Schnittstelle zwischen dem Kunststoffgehäuse der Auswerteelektronik, demFor example, battery sensor systems known from EP 1 435 524 A1 use a shunt resistor inserted in the circuit in the vicinity of the pole shank, wherein the voltage dropping across the shunt resistor, which is proportional to the current flowing through it, is measured. Due to the principle, an electrical connection between the shunt resistor and the transmitter must be provided for this purpose. The transmitter is usually mounted on a circuit board and is conveniently as close as possible to the shunt resistor. This structure requires an interface between the plastic housing of the transmitter, the
Shunt-Widerstand, dem Polschaft und einer abführenden Stromschiene zur Befestigung des Batteriekabels. Üblicherweise verwendete Kunststoffe haben den Nachteil, dass sie keine dichte Verbindung zu Kupfer bzw. Kupferlegierungen der Batte- riestrom führenden Teile eingehen können. An diesen Schnittstellen kann sich bei entsprechenden Einsatzbedingungen Korrosion bilden, die die Auswerteelektronik schädigt und letzt- endlich zu einem Defekt des Batteriesensors fuhren kann. Darüber hinaus ist prinzipbedingt die Messung selbst auch nicht potenzialfrei .Shunt resistor, the pole shank and a dissipating power rail for attaching the battery cable. Commonly used plastics have the disadvantage that they can not form a tight connection to copper or copper alloys of the battery power conducting parts. Corrosion can form at these interfaces under appropriate operating conditions, which damages the evaluation electronics and ultimately finally can lead to a defect of the battery sensor. In addition, due to the principle, the measurement itself is not potential-free.
Eine Anordnung nach DE 35 32 044 Al umgeht diese Probleme mittels eines beruhrungslos arbeitenden Stromsensors, bei dem ein offener magnetischer Kreis in Verbindung mit einem Hall- Sensorelement, das in einem Luftspalt des magnetischen Kreises angeordnet ist, um den stromführenden Leiter herum plat- ziert ist. Ein offener magnetischer Kreis zeigt jedoch eine starke Anfälligkeit gegen externe Magnetfelder und ist daher sehr störanfällig. Darüber hinaus ist ein solches System, bedingt durch die Remanenz des magnetischen Materials, nicht geeignet, Strome im mA-Bereich zu messen.An arrangement according to DE 35 32 044 Al circumvents these problems by means of a contactlessly operating current sensor, in which an open magnetic circuit in conjunction with a Hall sensor element, which is arranged in an air gap of the magnetic circuit, around the current-carrying conductor placed around is , However, an open magnetic circuit shows a strong susceptibility to external magnetic fields and is therefore very susceptible to interference. Moreover, due to the remanence of the magnetic material, such a system is not capable of measuring currents in the mA range.
Aufgabe der Erfindung ist es daher, eine beruhrungslos und damit potenzialfrei arbeitende Strommessanordnung zur Messung eines Batteriestromes anzugeben, die eine hohe Genauigkeit bei kleinen Strömen aufweist und möglichst nahe an der Batte- rie anordenbar ist.The object of the invention is therefore to provide a contactless and thus potential-free operating current measuring arrangement for measuring a battery current, which has a high accuracy at low currents and can be arranged as close to the battery as possible.
Die Aufgabe wird gelost durch eine beruhrungslos arbeitende Strommessanordnung gemäß Patentanspruch 1. Ausgestaltungen und Weiterbildungen des Erfindungsgedankens sind Gegenstand von Unteranspruchen.The object is achieved by a contactlessly operating current measuring arrangement according to claim 1. refinements and developments of the inventive concept are the subject of dependent claims.
Eine erfindungsgemaße beruhrungslos arbeitende Strommessanordnung zur Messung des zu- und abfließenden Stromes einer mindestens einen stabformigen Polschaft aufweisenden Batte- rie, umfasst einen mit einer Wicklung versehenen geschlossenen Ringkern, der mindestens einen Polschaft umschließt. Ferner ist eine Auswerteschaltung vorgesehen, die neben dem Polschaft angeordnet ist und die mit der Wicklung des Ringkerns elektrisch verbunden ist. Dabei bilden Ringkern, Wicklung und Auswerteschaltung einen Kompensationsstromsensor, welcher ein Messsignal bereitstellt, das dem in dem Polschaft fließenden Strom proportional ist. Vorteil der vorliegenden Erfindung ist es, dass ein geschlossenes magnetisches System verwendet wird, das sehr robust gegenüber externen Magnetfeldern ist und das beruhrungslos ar- beitet, so dass es weniger anfallig für Korrosion ist. Solche magnetische Kreise sind zusammen mit entsprechenden Auswerteschaltungen auch in der Lage, kleinere Strome, d.h. auch Strome im mA-Bereich mit hoher Genauigkeit zu messen und weisen darüber hinaus auch einen großen Messbereich hin zu hohe- ren Strömen auf. Durch Anordnen der Messanordnung an der Polschiene wird eine maximale Nahe zur Batterie erreicht und dabei der zur Verfugung stehende Platz optimal genutzt. Die Anordnung kann als eine einzige Bauform realisiert werden, so dass sie sich hermetisch mit einer Kunststoffhulle abschlie- ßen lasst und damit das Eindringen von Feuchtigkeit, welche zur Korrosion metallischer Teile fuhren kann, verhindert. Ein weiterer Vorteil besteht darin, dass kein zusatzlicher Widerstand in den Batteriestromkreis eingebracht wird, wodurch keine zusatzliche Verlustleistung und damit keine (weitere) Wärmeentwicklung verursacht wird. Darüber hinaus muss derAn inventive contactless current measuring arrangement for measuring the incoming and outgoing current of a battery having at least one rod-shaped pole shaft comprises a closed ring core provided with a winding and enclosing at least one pole shank. Furthermore, an evaluation circuit is provided, which is arranged next to the Polschaft and which is electrically connected to the winding of the toroidal core. In this case, ring core, winding and evaluation circuit form a compensation current sensor, which provides a measurement signal which is proportional to the current flowing in the Polschaft current. The advantage of the present invention is that a closed magnetic system is used, which is very robust against external magnetic fields and which operates without contact, so that it is less susceptible to corrosion. Such magnetic circuits, together with corresponding evaluation circuits, are also able to measure smaller currents, ie also currents in the mA range, with high accuracy and, moreover, also have a large measuring range towards higher currents. By arranging the measuring arrangement on the pole rail, a maximum proximity to the battery is achieved while making optimum use of the available space. The arrangement can be realized as a single design so that it can be hermetically sealed with a plastic sheath and thus prevents the penetration of moisture, which can lead to the corrosion of metallic parts. Another advantage is that no additional resistance is introduced into the battery circuit, whereby no additional power loss and thus no (further) heat generation is caused. In addition, the must
Stromkreis nicht aufgetrennt werden, um den Shunt-Widerstand einzufügen, was zum Einen die Korrosionsanfalligkeit weiter herabsetzt und zum Anderen eine leichtere Montage erlaubt, da der Stromsensor lediglich (ohne elektrische Kontaktierung) aufgesteckt wird.Circuit can not be separated to insert the shunt resistor, which on the one hand further reduces the susceptibility to corrosion and on the other hand allows easier installation, since the current sensor is only plugged (without electrical contact).
Die Erfindung wird nachfolgend anhand der in den Figuren der Zeichnung dargestellten Ausfuhrungsbeispiele naher erläutert, wobei gleiche Elemente mit gleichen Bezugszeichen versehen sind. Es zeigt:The invention will be explained in more detail with reference to the exemplary embodiments illustrated in the figures of the drawing, wherein like elements are provided with the same reference numerals. It shows:
Fig. 1 eine übliche Fahrzeugbatterie in der Draufsicht,1 is a conventional vehicle battery in plan view,
Fig. 2 eine Ausfuhrungsform einer erfindungsgemaßen Strom- messanordnung unter Verwendung einer zusatzlichen2 shows an embodiment of an inventive current measuring arrangement using an additional
Messeinrichtung, Fig. 3 eine Ausfuhrungsform eines mit einem Gehäuse versehenen bewickelten Ringkerns,Measuring device, 3 shows an embodiment of a housing provided with a wound toroidal core,
Fig. 4 die Anordnung des Ringkerns nach Fig. 3 an einer Polschiene einer Batterie,4 shows the arrangement of the toroidal core of FIG. 3 on a pole rail of a battery, FIG.
Fig. 5 die Anordnung nach Fig. 4 mit zusatzlich einem Gehauseteil zur Aufnahme der Auswertelektronik undFig. 5 shows the arrangement of FIG. 4 with additionally a housing part for receiving the evaluation electronics and
Fig. 6 eine komplett aufgebaute erfindungsgemaße Strommessanordnung mit zusatzlichem Hall-Sensor zur Messbereichserweiterung .6 shows a completely constructed current measuring arrangement according to the invention with additional Hall sensor for measuring range extension.
Fig. 1 zeigt in der Draufsicht den Aufbau einer üblicherweise in Fahrzeugen eingesetzten Batterie 1 mit zwei stabformig ausgebildeten Polschafte 2 und 2' . Die Polschafte 2 und 2' ragen von einer durch das Oberteil des Gehäuses der Batterie 1 gebildeten Ebene 3 auf, d.h. bei der Darstellung in Fig. 1 aus der Zeichenebene heraus. Erhöht gegenüber der Ebene 3 ist auch eine durch das Oberteil des Gehäuses oder Gehauseteiis der Batterie 1 gebildete weitere Ebene 4, die im Bereich der Polschafte 2 und 2' ausgespart ist, so dass dort Polnischen 5 und 5' gebildet werden und die Ebene 4 bildende, gegenüber der Ebene 3 erhöhte Gehauseteile die beiden Polschafte 2 und 2' zumindest in gerader Linie zueinander abschatten . Es gibt auch Batterien, bei denen Ebene 3 und 4 auf der gleichen Hohe liegen und nur die Polschafte 2 und 2' aus der Ebene 3 herausragen (Batterien ohne Polnische) . Die Erfindung ist auch bei solchen Batterietypen anwendbar.Fig. 1 shows in plan view the structure of a battery 1 usually used in vehicles with two poles 2 and 2 'shaped like a bar. The polishes 2 and 2 'project from a plane 3 formed by the top of the housing of the battery 1, i. in the illustration in Fig. 1 out of the plane. Increased with respect to the level 3 is also formed by the upper part of the housing or Gehauseteiis the battery 1 further level 4, which is recessed in the Polschafte 2 and 2 ', so that there polish 5 and 5' are formed and the level 4 forming , compared to the level 3 increased housing parts shadow the two Polschafte 2 and 2 'at least in a straight line to each other. There are also batteries in which levels 3 and 4 are at the same level and only polishes 2 and 2 'protrude from level 3 (batteries without polish). The invention is also applicable to such battery types.
Fig. 2 zeigt die elektrische Konfiguration einer erfindungs- gemaßen Strommessanordnung zur Messung des Batteriestromes, d.h. des zu- und abfließenden Stromes in die Batterie 1 aus Fig. 1. Dabei wird für die weiteren Betrachtungen Bezug ge- nommen auf den Polschaft 2 in der Polnische 5. Der besseren Übersichtlichkeit halber ist dabei der Polschaft 2 in Fig. 2 langer und schmaler gezeigt als dies bei den meisten Reali- sierungen der Fall sein dürfte. Jedoch ist mit dieser Darstellung das grundlegende Wirkprinzip der Erfindung besser ersichtlich .2 shows the electrical configuration of a current measuring arrangement according to the invention for measuring the battery current, ie the incoming and outgoing current, into the battery 1 from FIG. 1. Reference is made to the pole shaft 2 in the Polish for the further considerations 5. For the sake of clarity, the pole shaft 2 in FIG. 2 is shown as being longer and narrower than in most realizations. This should be the case. However, with this illustration, the basic operating principle of the invention is better understood.
Gemäß Fig. 2 ist um den Polschaft 2 herum ein geschlossener hochpermeabler Ringkern 6 angeordnet, auf den eine Wicklung 7 aufgebracht ist. Ringkern 6 und Wicklung 7 bilden dabei zusammen ein magnetisches Modul 8, das eine von dem Ringkern 6 umschlossene Öffnung 9 aufweist, durch die also der Polschaft 2 geführt ist. Die Wicklung 7 ist schließlich mit einer Auswerteschaltung 10 elektrisch verbunden. Mit der Auswerteschaltung ist zudem ein Magnetfeldsensor wie zum Beispiel ein Hall-Sensorelement 11 (oder jedes andere zum Erfassen von Magnetfeldern geeignete Sensorelement) verbunden, das eben- falls im Umfeld des Polschaftes 2 angeordnet ist, aber magnetisch unabhängig von dem magnetischen Modul 8 ist.According to FIG. 2, a closed high-permeable ring core 6 is arranged around the pole shank 2, onto which a winding 7 is applied. Toroidal core 6 and winding 7 together form a magnetic module 8, which has an opening 9 surrounded by the ring core 6, through which the pole shank 2 is guided. The winding 7 is finally electrically connected to an evaluation circuit 10. In addition, a magnetic field sensor, such as a Hall sensor element 11 (or any other sensor element suitable for detecting magnetic fields), which is likewise arranged in the vicinity of the pole shaft 2 but is magnetically independent of the magnetic module 8, is connected to the evaluation circuit.
Die Wicklung 7 in Verbindung mit dem Ringkern 6 sowie eine erste Auswerteeinrichtung 12 bilden zusammen einen Kompensa- tionsstromsensor, der je nach Ausführung des Ringkerns 6, der Wicklung 7 und der Auswerteeinrichtung 12, vom mA-Bereich bis zum 1000 A-Bereich zur Strommessung vorgesehen sein kann. Je nach Art des Kompensationsstromsensors können auch noch eine oder mehrere Wicklungen vorgesehen werden. Jedoch wird im vorliegenden Fall eine besondere Form eines Kompensationsstromsensors, nämlich ein Flux-Gate-Sensorprinzip eingesetzt, das vorteilhafterweise nur eine Wicklung benötigt und daher sehr platzsparend ist. Bei einem Flux-Gate-Sensor wird ein zusätzlicher Magnetisierungsstrom in die Wicklung 7 einge- speist, durch den der Ringkern 6 periodisch bis in die positive und negative Sättigung magnetisiert wird. Beispielsweise mit einer Abtast- und Halteschaltung wird ein Spannungsabfall an der Wicklung 7 abgetastet und gespeichert. Zudem wird der Mittelwert aus dem aktuellen und einem vorhergehenden Mess- wert gebildet. Bei der Mittelwertbildung fällt der durch die Hysterese des Magnetkerns bedingte Messfehler bzw. der Fehler durch den Magnetisierungsstrom aufgrund unterschiedlicher Vorzeichen heraus, wenn die beiden Abtastungen nach Durchlaufen der positiven bzw. negativen Sättigung (oder umgekehrt) erfolgen. An den Klemmen 15 steht dann ein analoges oder digitales Signal zur Verfugung, das dem Strom in dem Polschaft 2 proportional ist.The winding 7 in conjunction with the toroidal core 6 and a first evaluation device 12 together form a compensation current sensor which, depending on the design of the toroidal core 6, the winding 7 and the evaluation device 12, provides from the mA range up to the 1000 A range for current measurement can be. Depending on the type of compensation current sensor, one or more windings may also be provided. However, in the present case, a special form of compensation current sensor, namely a flux gate sensor principle is used, which advantageously requires only one winding and is therefore very space-saving. In the case of a fluxgate sensor, an additional magnetizing current is fed into the winding 7, by means of which the toroidal core 6 is periodically magnetized to the positive and negative saturation. For example, with a sample and hold circuit, a voltage drop across the winding 7 is sampled and stored. In addition, the mean value is formed from the current and a previous measured value. When averaging occurs, the measurement error caused by the hysteresis of the magnetic core or the error due to the magnetization current is different due to different Sign out when the two samples are made after passing through the positive and negative saturation (or vice versa). At the terminals 15 is then an analog or digital signal at your disposal, which is the current in the Polschaft 2 proportional.
Die dem entsprechende Ansteuerung der Wicklung 7 erfolgt vorliegend durch die Auswerteeinheit 12 in der Auswerteschaltung 10. Darüber hinaus umfasst die Auswerteschaltung in Weiter- bildung der Erfindung eine weitere Auswerteeinheit 13, die zusammen mit dem Hall-Sensorelement 11 einen direkt abbildenden Stromsensor bildet. Bei einem direkt abbildenden Sensor wird das durch einen Strom in einem Leiter erzeugte Magnetfeld gemessen und aus dem Magnetfeld auf den ursachlichen Strom geschlossen. Derartige Stromsensoren sind nur bei sehr hohem Strom genau, wenn nämlich die Stormagnetfelder klein sind gegenüber dem vom Leiter (im vorliegenden Fall des Polschaftes 2) erzeugten Magnetfeld.In this case, the evaluation circuit in further development of the invention comprises a further evaluation unit 13 which, together with the Hall sensor element 11, forms a direct-imaging current sensor. In a direct imaging sensor, the magnetic field generated by a current in a conductor is measured and closed from the magnetic field to the causal current. Such current sensors are accurate only at very high current, namely, when the Stormagnetfelder are small compared to the magnetic field generated by the conductor (in the present case of Polschaftes 2).
Um den ohnehin schon weiten Strommesskreis des Kompensationsstromsensors nach oben hin zu erweitern, wird also vorliegend noch ein direkt abbildender Stromsensor eingesetzt, wobei eine intelligente Umschalteinheit 14 in der Auswerteschaltung 10 beispielsweise in einem Uberlappungsbereich beider Strom- sensoren von einem auf den anderen Stromsensor umschaltet, wobei dies beispielsweise auch unter Einbeziehung einer Schalthysterese erfolgen kann. Je nachdem, in welchem Messbereich der zu messende Strom sich befindet, wird durch die intelligente Umschalteinheit 14 entweder die Auswerteeinheit 12 oder die Auswerteeinheit 13 auf Ausgangsanschlusse 15 derIn order to expand the already wide current measuring circuit of Kompensationsstromsensors upward, therefore, a directly imaging current sensor is used in the present case, with an intelligent switching unit 14 switches in the evaluation circuit 10, for example in an overlap region of both current sensors from one to the other current sensor, this can be done, for example, including a switching hysteresis. Depending on the measuring range in which the current to be measured is located, either the evaluation unit 12 or the evaluation unit 13 is connected to output terminals 15 of the intelligent switching unit 14
Auswerteschaltung 10 aufgeschaltet . Dabei wird der direktabbildende Stromsensor anhand des Kompensationsstromsensors in regelmäßigen Abstanden (periodisch) oder Ereignisgesteuert abgeglichen, d. h. an den Kompensationsstromsensor angeeicht. Vorteilhaft ist dabei, dass keine aufwandigen Einrichtungen zur Kompensation von temperatur-, herstellungs- und alte- rungsbedingten Schwankungen notwendig sind, die insbesondere weiteren Bauraum benötigen.Evaluation circuit 10 switched. In this case, the direct-imaging current sensor is adjusted on the basis of the compensation current sensor at regular intervals (periodically) or event-controlled, ie calibrated to the compensation current sensor. The advantage here is that no expensive equipment for the compensation of temperature, production and old tion-related fluctuations are necessary, which in particular require further space.
In den Figuren 3 bis 6 wird näher auf den mechanischen Aufbau einer erfindungsgemäßen Strommessanordnung eingegangen. Fig. 3 zeigt dazu das elektrische Modul 8, das in einem beispielsweise vergossenen Gehäuse 16 untergebracht ist und somit sehr korrosionsbeständig ist. Die elektrischen Anschlüsse der Wicklung 7 sind dabei in Form entsprechender Kontakte 17 aus dem Gehäuse herausgeführt.In the figures 3 to 6 will be discussed in more detail on the mechanical structure of a current measuring arrangement according to the invention. Fig. 3 shows the electrical module 8, which is housed in an example encapsulated housing 16 and thus is very resistant to corrosion. The electrical connections of the winding 7 are led out of the housing in the form of corresponding contacts 17.
Aus Fig. 4 ist dabei zu ersehen, dass das Gehäuse 16 innerhalb der Polnische 5 auf der Ebene 3 aufliegend um den Polschaft 2 herum angeordnet ist, so dass der Polschaft 2 durch die Öffnung im Gehäuse und damit durch die Öffnung im Gehäuse 16 (und damit durch den von ihm umschlossenen, in Fig. 4 nicht gezeigten Ringkern) hindurchgeführt ist. Darüber, d.h. auf der der Ebene 3 gegenüberliegenden Seite des Gehäuses 16 wird dann eine Polklemme 18 aufgesetzt, an die wahlweise ein Batteriekabel 19 zum Anschluss an das Bordnetz des Fahrzeuges angeschweißt oder angelötet wird oder wie dargestellt ein Schraubbolzen angebracht ist, an den das Batteriekabel lösbar angeschraubt wird. Die Anschluss klemme 18 weist einen Schraubklemmverschluss 20 zu deren Befestigung an dem PoI- schaft 2 auf. Bevorzugt überragt die Anschlussklemme 18 imIt can be seen from FIG. 4 that the housing 16 is arranged resting on the plane 3 around the pole shaft 2 within the Polish 5, so that the pole shaft 2 passes through the opening in the housing and thus through the opening in the housing 16 (and so that it is passed through the enclosed by him, not shown in Fig. 4 toroidal core). Above, i. on the level 3 opposite side of the housing 16, a pole terminal 18 is then placed on the either a battery cable 19 is welded or soldered for connection to the electrical system of the vehicle or as shown a bolt is attached to the battery cable is detachably screwed. The terminal 18 has a Schraubklemmverschluss 20 for their attachment to the shaft 2 on. Preferably, the terminal 18 extends beyond the
Wesentlichen nicht die Ebene 4, die wie bereits oben erwähnt gegenüber der Ebene 3 erhöht ist.Essentially not Level 4, which, as mentioned above, is higher than Level 3.
Gegenüber dem in Fig. 4 gezeigten Aufbau kommt bei dem in Fig. 5 gezeigten Aufbau nun auch ein weiteres Gehäuseteil 21 hinzu, in dem die gesamte Auswerteschaltung 10 eingebaut ist. Der besseren Übersichtlichkeit halber ist in Fig. 5 die Schaltung selbst nicht gezeigt. Somit ist aus Fig. 5 aber nun ersichtlich, dass das Gehäuse 16 des magnetischen Moduls 8 und das Gehäuse 21 sowohl mechanisch als auch elektrisch ineinander greifen. Beide Gehäuse 16 und 21 sind mechanisch miteinander verbunden, so dass sich schließlich eine eintei- lige Bauform ergibt, die darüber hinaus untereinander keine weiteren elektrischen Verbindungselemente mehr benotigt, da die Kontakte 17 des magnetischen Moduls 8 in das Gehäuse 21 ragen und dort direkt von den entsprechenden Schaltungsteilen in der Auswerteschaltung 10 kontaktiert werden können. Jedoch sind auch in gleicher Weise Kabelverbindungen beliebiger Lange möglich. Des Weiteren sind auch noch externe Anschlüsse zur Stromversorgung der Auswerteschaltung 10 sowie zum Abgreifen des Messergebnisses für eine Batteriemanagementein- heit vorgesehen, jedoch ist dies der Übersichtlichkeit halber in Fig. 5 nicht dargestellt. Beim vorliegenden Ausfuhrungsbeispiel ist das Gehäuse 21 zwischen Polschaft 2 und den die Ebene 4 definierenden Gehauseteilen der Batterie 1 in der Nische 5 angeordnet, so dass der in der Nische 5 noch zur Ver- fugung stehende Raum ausgenutzt wird ohne über die Ebene 4 hinauszuragen .Compared to the construction shown in FIG. 4, in the structure shown in FIG. 5, a further housing part 21 is now added, in which the entire evaluation circuit 10 is installed. For better clarity, the circuit itself is not shown in FIG. Thus, however, it can now be seen from FIG. 5 that the housing 16 of the magnetic module 8 and the housing 21 mesh with each other both mechanically and electrically. Both housings 16 and 21 are mechanically connected to each other, so that finally an unite In addition, there is no longer any need for any further electrical connection elements, since the contacts 17 of the magnetic module 8 protrude into the housing 21 and can be contacted directly there by the corresponding circuit parts in the evaluation circuit 10. However, cable connections of any length are also possible in the same way. Furthermore, external connections for the power supply of the evaluation circuit 10 and for picking up the measurement result for a battery management unit are also provided, but this is not shown in FIG. 5 for the sake of clarity. In the present exemplary embodiment, the housing 21 is arranged between the pole shaft 2 and the housing parts of the battery 1 defining the plane 4 in the recess 5, so that the space still available in the recess 5 is utilized without protruding beyond the plane 4.
Fig. 6 zeigt eine komplett aufgebaute beruhrungslos arbeitende Strommesseinrichtung, wobei das Gehäuse 26 zu Darstel- lungszwecken geöffnet ist, jedoch in der Verwendung hermetisch verschlossen und/oder vergossen sein kann, um Stör- und Korrosionsanfalligkeit zu minimieren. Das Gehäuse enthalt einen mit strukturierten Metallisierungen versehenen elektrisch isolierenden Trager, nämlich eine Platine 22, auf der elekt- rische Bauelemente 23 angeordnet und miteinander elektrisch kontaktiert sind und die die Auswerteschaltung 10 bilden. Darüber hinaus ist im Gehäuse auch das Hall-Sensorelement 11 angeordnet, und zwar möglichst nahe an der Polklemme 18. Jedoch wäre eine Anordnung des Hall-Elements an jeder anderen Stelle, an der ein dem Stromfluss durch den Polschaft proportionales Magnetfeld messbar ist, innerhalb und außerhalb des Gehäuses 21 oder des Gehäuses 16 denkbar.FIG. 6 shows a completely constructed contactless current measuring device, wherein the housing 26 is open for purposes of illustration, but may be hermetically sealed and / or molded in use in order to minimize the possibility of interference and corrosion. The housing contains an electrically insulating support provided with structured metallizations, namely a circuit board 22 on which electrical components 23 are arranged and electrically contacted with one another and which form the evaluation circuit 10. In addition, the Hall sensor element 11 is arranged in the housing, and as close to the pole terminal 18. However, an arrangement of the Hall element at any other point at which a current flow through the Polschaft proportional magnetic field is measurable within and outside the housing 21 or the housing 16 conceivable.
Vorteilhaft ist bei Anwendung des oben bereits geschilderten Messkonzepts, den direktabbildenden Stromsensor an den Kompensationsstromsensor (periodisch) anzueichen, dass kein Flusskonzentrator benotigt wird. Flusskonzentratoren sind beispielsweise weichmagnetische Elemente, die den magnetischen Fluss bundein und auf einen bestimmten Ort konzentrieren, im vorliegenden Fall auf den Magnetfeldsensor, und die dementsprechend schwer sind und relativ viel Platz benotigen. Jedoch können bei einer erfindungsgemaßen Anordnung ohne Weiteres auch Flusskonzentratoren eingesetzt werden, falls dies gewünscht oder dem Einzelfall entsprechend zweckmäßig ist.When applying the above-described measuring concept, it is advantageous to apply the direct-imaging current sensor to the compensation current sensor (periodically) so that no flux concentrator is needed. Are flux concentrators For example, soft magnetic elements that bundle the magnetic flux and focus on a particular location, in the present case on the magnetic field sensor, and which are therefore heavy and require a relatively large amount of space. However, in an arrangement according to the invention, flux concentrators can also be used without difficulty, if this is desired or appropriate for the individual case.
Die Befestigung der erfindungsgemaßen Messanordnung erfolgt beim Ausfuhrungsbeispiel dadurch, dass die bauliche Einheit der Messanordnung fest mit der Polklemme 18 verbunden ist und damit zusammen mit dieser an dem Polschaft 2 festgeklemmt wird. Jedoch kann die Befestigung auch auf unterschiedliche Art und Weise erfolgen. So wäre es zum Beispiel möglich, ei- nen eigenen Klemmmechanismus für die Messanordnung vorzusehen oder gar keinen Befestigungsmechanismus zu verwenden und stattdessen die Messanordnung mittels der Polklemme 18 gegen die Ebene 3 zu drucken und dadurch zu fixieren. The attachment of the inventive measuring arrangement takes place in the exemplary embodiment in that the structural unit of the measuring arrangement is firmly connected to the pole terminal 18 and thus clamped together with this on the pole shaft 2. However, the attachment can also be done in different ways. Thus, it would be possible, for example, to provide a separate clamping mechanism for the measuring arrangement or even to use no fastening mechanism and instead to print the measuring arrangement by means of the pole terminal 18 against the plane 3 and thereby fix it.

Claims

Patentansprüche claims
1. Berührungslos arbeitende Strominessanordnung zur Messung des zu- und abfließenden Stromes einer mindestens einen stab- förmigen Polschaft (2) aufweisenden Batterie (1) mit einem mit mindestens einer Wicklung (7) versehenen geschlossenen Ringkern (6), der die mindestens eine Polschiene (2) umschließt, und einer Auswerteschaltung (10), die neben dem Polschaft (2) angeordnet ist und die mit der mindestens einen Wicklung (7) des Ringkerns (6) elektrisch verbunden ist, wobei1. Contactless Strominessanordnung for measuring the incoming and outgoing stream of at least one rod-shaped Polschaft (2) having battery (1) with at least one winding (7) provided with a closed ring core (6), the at least one pole rail ( 2), and an evaluation circuit (10) disposed adjacent to the pole shank (2) and electrically connected to the at least one winding (7) of the toroidal core (6), wherein
Ringkern (6), Wicklung (en) (7) und Auswerteschaltüng (10) einen Kompensationsstromsensor bilden, welcher ein Messsignal bereitstellt, das dem in dem Polschaft (2) fließenden Strom proportional ist.Ring core (6), winding (s) (7) and Auswerteschaltüng (10) form a compensation current sensor, which provides a measuring signal which is proportional to the current flowing in the Polschaft (2) current.
2. Strommessanordnung nach Anspruch 1, bei der Kompensationsstromsensor ein Flux-Gate-Stromsensor ist.2. Current measuring arrangement according to claim 1, wherein the compensation current sensor is a flux-gate current sensor.
3. Strommessanordnung nach Anspruch 1 oder 2, bei der zudem ein Magnetfeldsensor (11) im Umfeld des Polschaftes (2) angeordnet und mit der Auswerteschaltung (10) elektrisch verbunden ist, wobei Magnetfeldsensor (11) und Auswerteschaltung (10) einen direktabbildenden Stromsensor bilden.3. Current measuring arrangement according to claim 1 or 2, wherein in addition a magnetic field sensor (11) in the vicinity of the Polschaftes (2) and electrically connected to the evaluation circuit (10), wherein magnetic field sensor (11) and evaluation circuit (10) form a direct-imaging current sensor ,
4. Strommessanordnung nach Anspruch 3, bei der der Magnetfeldsensor (11) ein Hall-Sensor ist.4. Current measuring arrangement according to claim 3, wherein the magnetic field sensor (11) is a Hall sensor.
5. Strommessanordnung nach Anspruch 3 oder 4, bei der Kompen- sationsstromsensor und direktabbildender Stromsensor für unterschiedliche Messbereiche ausgelegt sind, wobei beide Messbereiche sich teilweise überlappen.5. Current measuring arrangement according to claim 3 or 4, are designed in the Kompensungsstromsensor and direct imaging current sensor for different measuring ranges, both measuring ranges overlap partially.
6. Strommessanordnung nach Anspruch 5, bei der der direktab- bildende Stromsensor und der Kompensationssensor so ausgebildet sind, dass der direktabbildende Stromsensor an den Kom- pensationssensor zumindest im Überlappungsbereich angeeicht wird .6. Current measuring arrangement according to claim 5, in which the direct-imaging current sensor and the compensation sensor are designed so that the direct-imaging current sensor is connected to the compensation sensor is adjusted at least in the overlap area.
7. Strommessanordnung nach Anspruch 6, bei der Ringkern (6) samt Wicklung (7), Auswerteschaltung (10) und falls vorhanden der Magnetfeldsensor (11) eine bauliche Einheit bilden, die in einem ein- oder mehrteiligen Gehäuse untergebracht ist.7. Current measuring arrangement according to claim 6, wherein the toroidal core (6) together with winding (7), evaluation circuit (10) and, if present, the magnetic field sensor (11) form a structural unit which is housed in a single or multi-part housing.
8. Strommessanordnung nach Anspruch 7, bei der die bauliche Einheit mittels einer Klemmvorrichtung (18) an der Polschiene8. Current measuring arrangement according to claim 7, wherein the structural unit by means of a clamping device (18) on the pole rail
(2) befestigt ist.(2) is attached.
9. Strommessanordnung nach Anspruch 7 oder 8, bei der die bauliche Einheit an der Klemmvorrichtung (18) befestigt ist.9. Current measuring arrangement according to claim 7 or 8, wherein the structural unit is attached to the clamping device (18).
10. Strommessanordnung nach Anspruch 7, 8 oder 9, bei der die Batterie (1) im Bereich des mindestens einen Polschafts (2) eine Polnische (5) aufweist und die bauliche Einheit in dieser Polnische (5) angeordnet ist. 10. Current measuring arrangement according to claim 7, 8 or 9, wherein the battery (1) in the region of the at least one Polschafts (2) has a Polish (5) and the structural unit in this Polish (5) is arranged.
PCT/EP2009/004376 2008-06-20 2009-06-17 Contactlessly operating current-measuring arrangement for measuring a battery current WO2009153036A1 (en)

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CN115061055B (en) * 2022-08-18 2022-11-15 深圳市睿智通科技有限公司 Lithium ion battery operating condition monitoring comprehensive experiment equipment for new forms of energy storage

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