DE102023124782B3 - current sensor arrangement and vehicle battery - Google Patents

Abstract

The present invention relates to a sensor device (1) for determining a current flowing through a current conductor (20), preferably for determining a current flowing through a busbar of a vehicle battery (100), comprising a current conductor (20) for conducting a current along a longitudinal direction (30) and a sensor arrangement (5) of magnetic field sensors (S11-S24) for detecting a magnetic field formed around the current conductor (20) via current flow in the current conductor (20), wherein the current conductor (20) in the region of the sensor arrangement (5) is divided into at least two conductor paths (21, 22) running in the longitudinal direction (30) and spaced apart from one another. It further relates to a vehicle battery (100) comprising such a sensor arrangement (1, 2).

Description

technical field

The present invention relates to a sensor device for determining a current flowing through a current conductor, for example for determining a current flowing through a busbar of a vehicle battery, and a vehicle battery for providing the primary drive energy of an electric vehicle.

State of the art

It is known to use sensor devices that comprise a plurality of magnetic field sensors, i.e. sensors that output a corresponding signal based on the field strength or flux density of a magnetic field to which the magnetic field sensors are exposed, to detect or determine a current flowing through a current conductor, such as a busbar in a vehicle battery in an electric vehicle. When a current flows through a current conductor in a longitudinal direction of the current conductor, a magnetic field is formed due to the current flow. The field lines of the magnetic field extend in the circumferential direction relative to the direction of the current flow, i.e. the longitudinal direction of the current conductor. The strength or flux density of the magnetic field formed is proportional to the current strength of the current flowing through the current conductor. The signals of the magnetic field sensor are in turn proportional to the flux density of the magnetic field formed. The signals output by the magnetic field sensors can therefore be used to determine the current strength of the flowing current.

Such magnetic field sensors can be coils, for example. The sensitivity of the magnetic field sensor coil with regard to the magnetic field depends, among other things, on the angular orientation of the coil, more precisely on the angular orientation of the longitudinal axis of the coil, relative to the direction of the field lines of the magnetic field. The saturation limit of the coils is often far below the flux density of the resulting magnetic field, which is formed by the current flowing through the conductor to be measured. For example, in the case of bus bars in vehicle batteries of electric vehicles, current in the order of 1000 A, 1500 A or even 2000 A can flow during operation. This current generates a correspondingly strong magnetic field. To prevent the coils from becoming saturated during normal operation of the vehicle battery, the coils are arranged at a large angle to the direction of the magnetic field, or more precisely to the direction of the field lines, i.e. at a small angle to the longitudinal direction in which the current flows, so that the effective sensitivity of the coils in relation to the magnetic field is correspondingly low, or in other words, the proportion of the magnetic field acting on the coil becomes smaller as the angle becomes smaller. In particular, due to the comparatively low sensitivity of the coils in relation to the magnetic field to be measured, the coils can be sensitive to interference fields, which can distort the measurement signal.

The DE 10 2021 110 370 A1 and the DE 10 2021 127 855 A1 describe conventional sensor devices. From the DE 10 2021 110 370 A1 The sensitivity behavior of coils with respect to their orientation to the magnetic field is described. DE 10 2021 110 370 A1 and the DE 10 2021 127 855 A1 each show a sensor device in which two coils are arranged next to each other at one point in the longitudinal direction on both sides, axially symmetrical relative to the longitudinal axis of the current-transmitting conductor. The first coil has an angle of inclination to the longitudinal axis of the busbar, which is mirrored for the second magnetic field sensor coil due to the axially symmetrical arrangement. The two coils on the second side are symmetrical and thus arranged parallel to the coils on the first side.

The DE 10 2017 214 142 A1 shows a measuring arrangement for magnetically sensing an electric current, comprising a circuit board and an electrical conductor which is integrated in the circuit board, a first sensor and a second sensor which measure a z-component of a resulting magnetic field at a measuring point located within the conductor magnetic field. The DE 100 51 160 A1 shows a sensor arrangement for contactless measurement of a current, comprising a conductor with two parallel conductor branches, wherein an integrated circuit with two sensors for detecting magnetic fields caused by partial currents is arranged in a space formed by the conductor branches. The DE 10 2020 100 443 B4 shows a current sensor for measuring a current, comprising a support structure and two magnetic flux sensors which are attached to the support structure in such a way that they experience an asymmetrical magnetic field penetration as a result of a magnetic field generated by a current to be measured and generate a signal indicative of the current to be measured in a contactless manner, wherein the two magnetic flux sensors are attached to opposite main surfaces of the support structure.

representation of the invention

Based on the known state of the art, it is an object of the present invention The aim of the invention is to provide an improved sensor device for detecting a current flowing through a current conductor, for example an improvement in the behavior of the sensor device in the presence of a magnetic interference field and/or in terms of an improved sensitivity of the magnetic field sensors, as well as a correspondingly improved vehicle battery.

The object is achieved according to a first aspect by a sensor device for determining a current flowing through a current conductor, for example for determining a current flowing through a busbar of a vehicle battery, with the features of claim 1. Advantageous further developments emerge from the subclaims, the description and the figures.

Accordingly, a sensor device for determining a current flowing through a current conductor, for example for determining a current flowing through a busbar of a vehicle battery, is proposed, comprising a current conductor for conducting a current along a longitudinal direction and a sensor arrangement of magnetic field sensors for detecting a magnetic field formed around the current conductor via current flow in the current conductor.

In the area of the sensor arrangement, the current conductor is divided into at least two conductor paths that run longitudinally and are spaced apart from one another. The current flowing through the current conductor is therefore divided over or onto the two conductor paths, and the conductor paths are therefore connected in parallel. The individual currents through the conductor paths, i.e. the current component conducted through the first conductor path and the current component conducted through the second conductor path, are therefore lower than the current flowing through the undivided current conductor. The current components add up to the current flowing through the undivided current conductor. Accordingly, the magnetic fields around the conductor paths formed by the respective current component are also lower than the field generated on an undivided current conductor. In addition, in the area between the conductor paths, the directions of the field lines of the magnetic fields generated are opposite, so that the magnetic fields at least partially compensate for one another. A magnetic field resulting from the two magnetic fields of the conductor paths is therefore weakened or reduced in the area between the divided conductor paths. The magnetic field sensors of the sensor arrangement are therefore exposed to a smaller magnetic field than in the case of an arrangement on or in the area of an undivided conductor compared to conventional sensor devices from the prior art. The magnetic field sensors accordingly only reach saturation at higher currents or can be arranged at a smaller angle to the direction of the field lines of the magnetic field acting on them, i.e. at a comparatively large angle to the longitudinal direction of the conductor paths. In particular, if according to a further development the magnetic field sensors are arranged on a common carrier, for example a circuit board, the possible gradient of external fields with regard to the sensor arrangement, more precisely with regard to the at least one signal output by its magnetic field sensors, is significantly reduced. With an optional assembly of the magnetic field sensors at a comparatively large angle, for example greater than 60°, or even 90° to the current flow, the assembly of the parts on the carrier can also be carried out much more easily and with fewer tolerances than with an arrangement of the magnetic field sensors at a comparatively small angle to the direction of the current flow, for example 3° to 15°. Accordingly, production is simplified and production costs reduced.

The current conducted through the undivided conductor is distributed between the conductor paths essentially in proportion to the cross-sectional areas of the conductor paths. If the conductor paths are made of the same material and have the same cross-sectional area, half of the total current is conducted through each conductor path. Accordingly, the magnetic fields generated by the current components flowing through the conductor paths are essentially the same size.

According to one embodiment, at least one magnetic field sensor of the sensor arrangement is arranged between the conductor paths, wherein preferably at least two magnetic field sensors of the sensor arrangement are arranged between the first conductor path and the second conductor path. As described above, the magnetic field generated by the current component flowing through the first conductor path and the corresponding magnetic field of the second conductor path are oppositely directed between the conductor paths. More precisely, the field lines of the magnetic fields are oppositely directed or have at least oppositely directed vector components. In the area between the conductor paths, the resulting magnetic field is therefore at least partially weaker than the individual magnetic fields of the conductor paths. Due to the comparatively low resulting magnetic field, the at least one magnetic field sensor can be arranged at a smaller angle to the field lines of the magnetic fields, in other words at a larger angle to the longitudinal direction, than is the case with conventional sensor devices from the prior art when current of the same current strength is passed through the current conductors. The magnetic field sensors are advantageously arranged in the direction the field lines of the magnetic fields and/or at approximately 90° to the direction of current flow through the conductor.

According to one embodiment, all magnetic field sensors of the sensor arrangement are arranged between the conductor paths. Accordingly, the advantages described above can be achieved for all magnetic field sensors.

Optionally, at least one magnetic field sensor is arranged on an inner side of the first conductor path and/or at least one magnetic field sensor is arranged on an inner side of the second conductor path. The "inner side" of the conductor paths is in each case a side of a conductor path that faces the other conductor path.

According to one embodiment, at least one magnetic field sensor of the sensor arrangement is arranged outside the conductor paths with respect to the conductor paths. All magnetic field sensors of the sensor arrangement can also be arranged outside the conductor paths with respect to the conductor paths.

Optionally, at least one magnetic field sensor is arranged on an outer side of the first conductor path and/or at least one magnetic field sensor is arranged on an outer side of the second conductor path. The "outer side" of the conductor paths is in each case a side of a conductor path that faces away from the other conductor path.

According to one embodiment, at least one magnetic field sensor of the sensor arrangement can be assigned to a conductor path, for example the first conductor path, and/or at least one magnetic field sensor of the sensor arrangement can be assigned to the other conductor path, for example the second conductor path. In this document, “assigned” means that the magnetic field sensor is arranged closer to the “assigned” conductor path, advantageously in such a way that the influence of the magnetic field of the assigned conductor path on the magnetic field sensor is greater than the influence of the magnetic field of the other conductor path. In other words, the field strength of the magnetic field generated via current flow through the assigned conductor path is greater than the field strength of the magnetic field of the corresponding other conductor path.

mit µ₀ = die magnetischen Feldkonstante, r = der Abstand zu einer in Längsrichtung verlaufenden Mittellängsachse des Leiter(pfad)s, und l = der durch den Leiter(pfad) fließende Strom. Dies trifft im Wesentlichen uneingeschränkt zu für (kreis)runde Leiter in Nahfeld sowie für Leiter im Fernfeld. Bei Leitern mit unrundem Querschnitt, beispielsweise bei Leitern mit Rechteck-Querschnittsform, ist die Flussdichte ebenso im Wesentlichen abhängig von der Entfernung zum Leiter, die Flussdichte ist jedoch ferner abhängig von Winkel um die Längsrichtung, wie beispielsweise aus der beigefügten und unten beschriebenen 3 zu entnehmen.The flux density B of a magnetic field generated by current flow in a (straight) conductor (path) can be calculated as: $$B={\mu }_0\frac{1}{2\mathrm{\pi }r}\text{l}$$

with µ ₀ = the magnetic field constant, r = the distance to a longitudinal central axis of the conductor (path), and l = the current flowing through the conductor (path). This essentially applies without restriction to (circular) round conductors in the near field as well as to conductors in the far field. For conductors with a non-circular cross-section, for example for conductors with a rectangular cross-section, the flux density is also essentially dependent on the distance to the conductor, but the flux density is also dependent on angles around the longitudinal direction, as can be seen for example from the attached and described below. 3 to be taken.

In a zero field region, the magnetic field of the first conductor path (B ₁ ) and the magnetic field of the second conductor path (B ₁ ) essentially cancel each other out, in other words, if: $$\begin{array}{ccc}{\mathrm{<figure-callout\; id="1"\; label="B"\; filenames="DE102023124782B3\_0007.png,DE102023124782B3\_0014.png"\; state="\{\{state\}\}">B</figure-callout>}}_1-{\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="DE102023124782B3\_0021.png"\; state="\{\{state\}\}">B</figure-callout>}}_2=0& \text{bzw}\text{.}& {\mathrm{<figure-callout\; id="1"\; label="B"\; filenames="DE102023124782B3\_0007.png,DE102023124782B3\_0014.png"\; state="\{\{state\}\}">B</figure-callout>}}_1={\mathrm{<figure-callout\; id="2"\; label="B"\; filenames="DE102023124782B3\_0021.png"\; state="\{\{state\}\}">B</figure-callout>}}_2\end{array}$$

ergibt sich für den Nullfeldbereich: $$\begin{array}{ccc}\frac{l_1}{r_1}-\frac{l_2}{r_2}=0& \text{bzw}.& \frac{l_1}{r_1}=\frac{l_2}{r_2}\end{array}$$

Since the flux density, as can be seen above, depends on the quotient $\frac{l}{r},$

results for the zero field range: $$\begin{array}{ccc}\frac{l_1}{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="DE102023124782B3\_0007.png,DE102023124782B3\_0014.png"\; state="\{\{state\}\}">r</figure-callout>}}_1}-\frac{l_2}{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="DE102023124782B3\_0021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2}=0& \text{bzw}.& \frac{l_1}{{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="DE102023124782B3\_0007.png,DE102023124782B3\_0014.png"\; state="\{\{state\}\}">r</figure-callout>}}_1}=\frac{l_2}{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="DE102023124782B3\_0021.png"\; state="\{\{state\}\}">r</figure-callout>}}_2}\end{array}$$

In this zero-field region, the resulting magnetic field resulting from the addition of the magnetic fields of the conductor paths essentially has a flux density of zero.

According to one embodiment, at least one magnetic field sensor of the sensor arrangement is arranged in the zero field region between the first conductor path and the second conductor path. Accordingly, this at least one sensor essentially does not measure any magnetic field generated via current flow. A signal generated by the at least one magnetic field sensor in the zero field region due to a magnetic field can therefore be used by this at least one magnetic field sensor to determine the presence of an external magnetic field. In other words, the at least one magnetic field sensor arranged in the zero field region can be designed to detect an external (electro)magnetic influence or interference field.

According to one embodiment, at least one magnetic field sensor of the sensor arrangement is arranged on a lateral side of one of the conductor paths with respect to the conductor paths, wherein preferably at least one sensor is arranged on a lateral side of the first conductor path and at least one magnetic field sensor is arranged on a lateral side of the second conductor path.

Related to a transverse direction that runs transversely to the longitudinal direction between the conductor paths a “lateral side” in this document means a side that is oriented laterally to that direction.

According to one embodiment, at least two magnetic field sensors of the sensor arrangement are arranged on a common carrier, preferably a common printed circuit board.

Alternatively or additionally, at least one magnetic field sensor can be arranged on a first side of the common carrier and at least one magnetic field sensor can be arranged on a second side of the common carrier opposite the first side.

Alternatively or additionally, at least one magnetic field sensor can be accommodated in a housing, for example at least partially embedded in a potting compound body.

Advantageously, all magnetic field sensors of the sensor arrangement or the sensor arrangement are accommodated in the housing.

The housing can be shaped in such a way that it can be inserted and fixed between the conductor paths and/or can be plugged onto a conductor path from the side. This makes it easy to achieve precise and permanent positioning and orientation of the magnetic field sensors housed in the housing and held in a fixed position.

According to one embodiment, the sensor arrangement comprises at least two magnetic field sensors which are arranged at the same height or synonymously at the same position with respect to the longitudinal direction.

Alternatively or additionally, the sensor arrangement can comprise at least one magnetic field sensor arranged in a first position with respect to the longitudinal direction and at least one magnetic field sensor arranged in a second position with respect to the longitudinal direction.

According to one embodiment, at least two magnetic field sensors of the sensor arrangement can each be arranged at an angle between greater than 0° and 90° to the longitudinal direction. More precisely, at least two magnetic field sensors can each be arranged with their longitudinal direction, in which, for example, a core of the magnetic field sensor can extend, at an angle to the longitudinal direction.

According to one embodiment, at least two magnetic field sensors of the sensor arrangement can be arranged at an angle of between greater than 0° and 90° of the same magnitude to the longitudinal direction.

More precisely, at least two magnetic field sensors can be arranged with their longitudinal direction, in which, for example, a core of the magnetic field sensor can extend, at an angle of the same magnitude to the longitudinal direction.

Alternatively or additionally, at least two magnetic field sensors can be oriented parallel to each other.

Alternatively or additionally, at least two magnetic field sensors can be oriented perpendicular to the longitudinal direction. These at least two sensors are advantageously arranged between the conductor paths. This is because, as described above, in the area between the conductor paths there is a reduced resulting magnetic field compared to the flux densities of the individual magnetic fields of the conductor paths, i.e. a magnetic field with a lower resulting flux density than outside the conductor paths.

According to one embodiment, the magnetic field sensors of the sensor arrangement can be designed as coils.

According to one embodiment, the current conductor may be a busbar for conducting current in a vehicle battery.

According to the invention, at least two magnetic field sensors, preferably exactly two or exactly four magnetic field sensors, of the sensor arrangement are connected to form a sensor path or channel, wherein each sensor path or channel outputs its own signal, for example to a control device and/or evaluation device.

The sensor arrangement comprises at least two sensor paths or channels.

According to one embodiment, a sensor path or channel can be arranged in a region of the conductor, more precisely the conductor paths, in which it has a first cross-sectional shape, and a further sensor path or channel can be arranged in a region of the conductor in which it has a second cross-sectional shape.

The above object is further achieved by a vehicle battery for providing the primary drive energy of an electric vehicle with the features of claim 13. Advantageous further developments emerge from the present description and the figures.

Accordingly, a vehicle battery for providing the primary drive energy of an electric vehicle is proposed, which comprises at least one battery module for providing an electrical voltage and a sensor device according to one of the preceding embodiments.

Short description of the characters

• 1 bis 3 schematisch Ansichten einer Sensorvorrichtung zum Erfassen eines durch einen Stromleiter in einer Längsrichtung fließenden Stroms;
• 4, 5 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 6, 7 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 8, 9 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 10,11 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 12, 13 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 14,15 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 16, 17 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 18, 19 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 20. 21 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 22, 23 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 24, 25 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 26 schematisch die Verläufe der Ausgabesignale von aus Magnetfeldsensoren der Sensorvorrichtung gemäß der 24 und 25 gebildeten Kanäle über die Stromstärke;
• 27, 28 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 29 schematisch die Verläufe der Ausgabesignale von aus Magnetfeldsensoren der Sensorvorrichtung gemäß der 27 und 28 gebildeten Kanäle über die Stromstärke;
• 30, 31 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 32 schematisch die Verläufe der Ausgabesignale von aus Magnetfeldsensoren der Sensorvorrichtung gemäß der 30 und 31 gebildeten Kanäle über die Stromstärke;
• 33, 34 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 35 schematisch die Verläufe der Ausgabesignale von aus Magnetfeldsensoren der Sensorvorrichtung gemäß der 33 und 34 gebildeten Kanäle über die Stromstärke;
• 36 bis 38 schematisch Ansichten einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 39 schematisch die Verläufe der Ausgabesignale von aus Magnetfeldsensoren der Sensorvorrichtung gemäß der 36 bis 38 gebildeten Kanäle über die Stromstärke;
• 40 schematisch eine Seitenansicht einer Sensorvorrichtung gemäß einer weiteren Ausführungsform;
• 41 schematisch die Verläufe der Ausgabesignale von aus Magnetfeldsensoren der Sensorvorrichtung gemäß 40 gebildeten Kanäle über die Stromstärke;
• 42 schematisch eine Fahrzeugbatterie zum Bereitstellen der Primärantriebsenergie eines Elektrofahrzeugs.

Further advantageous embodiments of the invention are explained in more detail by the following description of the figures.

• 1 to 3 schematic views of a sensor device for detecting a current flowing through a current conductor in a longitudinal direction;
• 4 , 5 schematic views of a sensor device according to another embodiment;
• 6 , 7 schematic views of a sensor device according to another embodiment;
• 8 , 9 schematic views of a sensor device according to another embodiment;
• 10 , 11 schematic views of a sensor device according to another embodiment;
• 12 , 13 schematic views of a sensor device according to another embodiment;
• 14 , 15 schematic views of a sensor device according to another embodiment;
• 16 , 17 schematic views of a sensor device according to another embodiment;
• 18 , 19 schematic views of a sensor device according to another embodiment;
• 20 21 schematic views of a sensor device according to another embodiment;
• 22 , 23 schematic views of a sensor device according to another embodiment;
• 24 , 25 schematic views of a sensor device according to another embodiment;
• 26 schematically the curves of the output signals from magnetic field sensors of the sensor device according to the 24 and 25 formed channels via the current strength;
• 27 , 28 schematic views of a sensor device according to another embodiment;
• 29 schematically the curves of the output signals from magnetic field sensors of the sensor device according to the 27 and 28 formed channels via the current strength;
• 30 , 31 schematic views of a sensor device according to another embodiment;
• 32 schematically the curves of the output signals from magnetic field sensors of the sensor device according to the 30 and 31 formed channels via the current strength;
• 33 , 34 schematic views of a sensor device according to another embodiment;
• 35 schematically the curves of the output signals from magnetic field sensors of the sensor device according to the 33 and 34 formed channels via the current strength;
• 36 to 38 schematic views of a sensor device according to another embodiment;
• 39 schematically the curves of the output signals from magnetic field sensors of the sensor device according to the 36 to 38 formed channels via the current strength;
• 40 schematically a side view of a sensor device according to another embodiment;
• 41 schematically the curves of the output signals from magnetic field sensors of the sensor device according to 40 formed channels via the current strength;
• 42 schematically shows a vehicle battery for providing the primary drive energy of an electric vehicle.

Detailed description of advantageous embodiments

Advantageous embodiments are described below with reference to the figures. Identical, similar or equivalent elements in the different figures are provided with identical reference symbols, and a repeated description of these elements is partially omitted in order to avoid redundancies.

In 1 is a schematic side view along a transverse direction 31 oriented perpendicular to a longitudinal direction 30 of a sensor device 1 for detecting a current flowing through a current conductor 20 in a longitudinal direction 30 shown. The current conductor 20 is designed here as a busbar for a vehicle battery of an electric vehicle (not shown).

In the area of a sensor arrangement 5, the current conductor 20 is divided into two conductor paths 21, 22 that run in the longitudinal direction 30 and are spaced apart from one another. The current flowing through the current conductor 2 is thus divided between the current paths 21, 22.

In the present case, the current conductor 20 is formed in one piece. For this purpose, the first current path 21 was welded to a raw body of the current conductor 20, for example via friction welding or ultrasonic welding.

The conductor paths 21, 22 of the current conductor 20 have the same material and have the same cross-sectional area when viewed transversely to the longitudinal direction 30. Accordingly, the current is essentially divided in half between the two conductor paths 21, 22. The portions of the total current flowing through the conductor paths 21, 22 are referred to in this document as “current components”. Alternatively, the current conductor can also have different materials. For example, the conductor paths 21, 22 and/or the undivided area of the current conductor 20 can have different materials.

A magnetic field 41, 42 is generated around each conductor path 21, 22 due to the current component flowing in the longitudinal direction 30, the field lines of which run in the circumferential direction around the conductor path 21, 22 with respect to the longitudinal direction 30.

As introduced above, the sensor device 1 comprises a sensor arrangement 5 of magnetic field sensors for detecting a magnetic field formed around the current conductor 20 via current flow in the current conductor 20.

According to this embodiment, the sensor arrangement 5 comprises two magnetic field sensors S11, S12 designed as sensor coils with a core, which are arranged in the same (first) position P1 with respect to the longitudinal direction 30, in this case between the conductor paths 21, 22. A first magnetic field sensor S11 is assigned to the first conductor path 21. It is therefore arranged much closer to the first conductor path 21 than to the second conductor path 22. A second magnetic field sensor S12 is assigned to the second conductor path 22. It is therefore arranged much closer to the second conductor path 22 than to the first conductor path 21. The magnetic field sensors S11, S12 are each arranged at a predetermined distance 33 from the conductor path 21, 22 assigned to them. They each have the predetermined distance 33* from the other conductor path 22, 21.

It can be seen that the conductor paths 21, 22 of a height direction 32 oriented perpendicular to the transverse direction 31 and perpendicular to the longitudinal direction 30 have the same height 23. The height 23 optionally corresponds to half the height 25 of the current conductor 20 in the undivided state. The position of the magnetic field sensors S11, S12 refers to the longitudinal axes L11, L12 of the magnetic field sensors S11, S12. The longitudinal axes L11, L12 of the magnetic field sensors S11, S12 are located at the first position P1 in a common longitudinal axis plane, which in this case is oriented perpendicular to the longitudinal direction 30.

2 shows a schematic plan view along the height direction 32. For a better understanding, the magnetic field sensors S11, S12 located under the conductor path 21 and their longitudinal axes L11, L12 are in 2 marked.

The current conductor 20 and the conductor paths 21, 22 have a constant width 24. In relation to the central longitudinal axis 34 of the conductor paths 21, 22 running in the longitudinal direction 30, the magnetic field sensors are arranged in the middle of the extension 35 of the conductor paths 21, 22 in the longitudinal direction 30. The magnetic field sensors S11, S12 are therefore each spaced apart from both ends of the conductor paths 21, 22 by a distance 36 equal to half the size of the extension 35. Alternatively, the magnetic field sensors S11, S12 can also be arranged at a distance from the middle of the extension 35.

The magnetic field sensors S11, S12 are also positioned centrally to the conductor paths 21, 22 with respect to the transverse direction 21.

3 shows schematically a sectional view through the sensor device 1 of the 1 and 2 at the level of the first position P1.

mit I₁ = die Stromkomponente des ersten Leiterpfads 21, I₂ = die Stromkomponente des zweiten Leiterpfads 22, und I = der Gesamtstrom, der durch den Stromleiter 20 geleitet wird bzw. fließt.Since the height 23 and width 24 of the conductor paths 21, 22 are the same, both have the same cross-sectional area, which is square in this case and rectangular in the present case, and is shown in hatched form. Since the conductor paths 21, 22 also have the same material and the same length, their conductor resistances are essentially the same. Accordingly, the current conducted through the current conductor 20 is distributed between the conductor paths 21, 22 essentially in a ratio of 1:1. In other words: $${\mathrm{<figure-callout\; id="1"\; label="l"\; filenames="DE102023124782B3\_0007.png,DE102023124782B3\_0014.png"\; state="\{\{state\}\}">l</figure-callout>}}_1={\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="DE102023124782B3\_0021.png"\; state="\{\{state\}\}">l</figure-callout>}}_2=\frac{\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="DE102023124782B3\_0021.png"\; state="\{\{state\}\}">l</figure-callout>}}{2}$$

with I ₁ = the current component of the first conductor path 21, I ₂ = the current component of the second conductor path 22, and I = the total current that is conducted or flows through the current conductor 20.

Accordingly, the magnetic fields 41, 42 formed around the conductor paths 21, 22 by the current components I ₁ , I ₂ , indicated here via their field lines running in the circumferential direction, are essentially the same. To make it easier to distinguish, the field lines of the first magnetic field 41 of the first conductor path 21 are shown in dashed lines, and the field lines of the second magnetic field 42 of the second conductor path 22 are shown in dotted lines.

The flux density B of the magnetic fields 41, 42 decreases proportionally to the distance or radius r relative to the central longitudinal axis 34 of the respective conductor path (see above).

The field direction of the magnetic fields 41, 42 is indicated by the arrows shown on the field lines. It can be seen that between the conductor paths 21, 22 the field direction of the magnetic fields 41, 42 is oriented in opposite directions. The magnetic fields 41, 42 therefore at least partially compensate each other, so that in the area between the conductor paths 21, 22 there is an area of reduced resulting flux density. Since the magnetic fields 41, 42 are essentially the same (strong) due to the symmetrical structure of the conductor paths 21, 22, a zero field area 43 is created in the middle between the conductor paths 21, 22, in which there is almost no flux density of the resulting magnetic field, which is composed of the addition or superposition of the magnetic fields 41, 42. In other words, the zero field area 43 is essentially free of magnetic fields.

In this zero field area, at least one magnetic field sensor (not shown here) can be arranged to determine the presence of an external interference field.

Since the first magnetic field sensor S11 is arranged on the side of the first conductor path 21 with respect to the zero field region, the flux density of the first magnetic field 41 is greater there than the flux density of the second magnetic field 42. The resulting reduced magnetic field therefore extends roughly in the direction of the field lines of the first magnetic field 41.

Since the second magnetic field sensor S12 is arranged on the side of the second conductor path 22 with respect to the zero field region, the flux density of the second magnetic field 42 is greater there than the flux density of the first magnetic field 41. The resulting reduced magnetic field therefore extends roughly in the direction of the field lines of the second magnetic field 42.

The magnetic field sensors can be connected together to form a channel or form a common channel that can output a sensor signal based on the magnetic fields 41, 42.

The magnetic field sensors S11, S12 are arranged symmetrically between the conductor paths 21, 22 with respect to the height direction 32. Accordingly, they each have the same distance 38 to an axis of symmetry, indicated here as the longitudinal direction 30. The axis of symmetry is located centrally between the conductor paths 21, 22. These therefore have the same distance 37 to the axis of symmetry.

The magnetic field sensors S11, S12 are arranged in the height direction 32, at the height of the first position 1, at a distance 50 from each other.

The magnetic field sensors S11, S12 are oriented with their respective (central) longitudinal axes L11, L12 perpendicular to the longitudinal direction 30, i.e. perpendicular to the direction of current flow. They are therefore oriented in the circumferential direction relative to the central longitudinal axes 34 of the conductor paths 21, 22. The longitudinal axes L11, L12 are therefore oriented in the direction of the field lines of the magnetic fields 21, 22. The magnetic field sensors S11, S12 therefore measure with the maximum possible sensitivity. This arrangement is also possible with a current conductor with currents of up to 1500 A, 2000 A or even more, since the magnetic fields 21, 22 partially compensate each other.

4 shows schematically a side view of a sensor device 1 according to another embodiment. 5 shows schematically a top view of the sensor device 1. The sensor device 1 according to the 4 and 5 essentially corresponds to that of the 1 to 3 , with the exception of sensor arrangement 5.

According to this embodiment, the sensor arrangement 5 comprises two magnetic field sensors S11, S21 designed as sensor coils with a core, wherein a first sensor S11 is arranged in a first position P1 with respect to the longitudinal direction 30 and a second sensor S21 is arranged in a second position spaced apart from the first position P1 by the distance 51 with respect to the longitudinal direction 30. The magnetic field sensors S11, S21 are arranged between the conductor paths 21, 22, thus in the area of the resulting reduced magnetic field. Both magnetic field sensors S11, S21 are assigned to the first conductor path 21. Accordingly, they are arranged significantly closer to the first conductor path 21 than to the second conductor path 22. The position of the magnetic field sensors S11, S21 therefore corresponds to that of the sensor S11 of the embodiment according to 1-3 , whereby the magnetic field sensors S11, S21 are only spaced apart by the distance 51. The sensor arrangement 5 is arranged centrally in the area of the conductors in relation to the longitudinal direction 30. paths 21, 22. The magnetic field sensors S11, S21 are each at a distance 39 from a central position in the longitudinal direction 30, which corresponds to half the distance 51.

To achieve different output signals, the conductor paths 21, 22 can each comprise at least one recess 72, for example in the second position P2, which is indicated here by means of dashed lines. As a result, the height and vector orientation of the magnetic field, or more precisely the flux density, are different for the two magnetic field sensors.

6 shows schematically a side view of a sensor device 1 according to another embodiment. 7 shows schematically a top view of the sensor device 1. The sensor device 1 according to the 6 and 7 essentially corresponds to that of the 1 to 5 , with the exception of sensor arrangement 5.

The sensor arrangement 5 comprises four magnetic field sensors S11-S22, all of which are arranged between the conductor paths 21, 22. Two magnetic field sensors S11, S12 are arranged at the level of a first position P1, analogous to the sensors S11, S12 from 1-3 Two further magnetic field sensors S21, S22 are, analogous to sensor S21, 4 and 5 , arranged at a second position P2 spaced apart by the distance 51 from the first position, again analogous to the sensors S11, S12 from 1-3 In other words, the sensor arrangement 5 can consist of 6-7 as a combination of the sensor arrangements 5 of the 1-3 and the 4-5 be understood.

The magnetic field sensors S11-S22 are arranged on a common carrier 6. The sensors S11, S21 assigned to the first conductor path 21 are arranged on a first side 60 of the carrier 6 facing the first conductor path 21, and the sensors S21, S22 assigned to the second conductor path 22 are arranged on a second side 61 of the carrier 6 facing the second conductor path 22 and opposite the first side 60.

The sensors S11 and S21 lie with their longitudinal axes L11 and L21 on a common plane that is oriented parallel to the longitudinal direction 30 and, in this case, optionally parallel to the inner side 27 of the associated conductor path 21.

The sensors S12 and S22 lie with their longitudinal axes L12 and L22 on a common plane which is oriented parallel to the longitudinal direction 30 and in this case is optionally parallel to the inner side 27 of the associated conductor path 22.

The sensors S11 and S12 lie with their longitudinal axes L11 and L12 on a common plane that is oriented perpendicular to the longitudinal direction 30 and, in this case, optionally perpendicular to the inner side 27 of the associated conductor path 21.

The sensors S21 and S22 lie with their longitudinal axes L21 and L22 on a common plane which is oriented perpendicular to the longitudinal direction 30 and, in this case, optionally perpendicular to the inner side 27 of the associated conductor path 22.

The positions, distances, spacings, etc. described in this document refer to the longitudinal axes L11-L22 of the sensors.

The one in the 6 and 7 The carrier 6 shown is of course not limited to this embodiment, but can be used in all embodiments. More than one carrier 6 can also be provided.

For example, the magnetic field sensors S11 and S12 can be connected to form a channel, and accordingly the magnetic field sensors S21 and S22. Alternatively, a channel can also be formed from the magnetic field sensors S11-S22.

8 shows schematically a side view of a sensor device 1 according to another embodiment. 9 shows schematically a top view of the sensor device 1. The sensor device 1 according to the 8 and 9 essentially corresponds to that of the 1 to 7 , with the exception of sensor arrangement 5.

The sensor arrangement 5 according to 8 and 9 comprises four magnetic field sensors S11, S12, S13, S14, each arranged at an angle α to the longitudinal direction 30.

In this document, the "angle" between the orientation of a magnetic field sensor and the longitudinal direction is understood to mean an angle or corresponds to an angle that is enclosed by the longitudinal axis of the respective magnetic field sensor and the longitudinal direction in a plan view of a plane in which the longitudinal axis of the magnetic field sensor lies and which is oriented parallel to the longitudinal direction. In other words, the "angle" corresponds to an angle that is enclosed between a projection of the longitudinal axis and a projection of the longitudinal direction onto the plane. The plane corresponds to a view plane of a plan view perpendicular to the longitudinal direction, as for example in 1 , 4 , 6 and 8 shown.

The sensor arrangement 5 comprises two magnetic field sensors assigned to the first conductor path 21. ren S11, S12, whose longitudinal axes L11, L12 are arranged in a plane oriented parallel to the longitudinal direction 30, and of which a first magnetic field sensor S11 is inclined with respect to its longitudinal axis L11 against the longitudinal direction 30 by the angle α in a first direction, which in this case extends transversely in a first directional sense, and of which the second magnetic field sensor S12 is inclined with respect to its longitudinal axis L12 against the longitudinal direction 30 by the angle α in a wide direction, which extends transversely in a direction opposite to the first directional sense. The first and second magnetic field sensors S11, S12 together form a pair of magnetic field sensors. The sensor arrangement 5 further comprises two magnetic field sensors S13, S14 assigned to the second conductor path 22, whose longitudinal axes L13, L14 are arranged in a plane oriented parallel to the longitudinal direction 30. Of these, a first magnetic field sensor S13 is inclined with respect to its longitudinal axis L13 against the longitudinal direction 30 by the angle α in the first direction and a second magnetic field sensor S14 is inclined with respect to its longitudinal axis L14 against the longitudinal direction 30 by the angle α in the second direction.

The magnetic field sensors S11, S12 or their longitudinal axes L11, L12 or the plane defined by them are arranged at a distance 33 from the first conductor path 21. The magnetic field sensors S13, S14 or their longitudinal axes L13, L14 or the plane defined by them are arranged at a distance 33 from the second conductor path 21.

The two distances 33 can be the same as in this case, or alternatively they can be different.

The angles α of the four sensors S11-S14 each have the same value, optionally 66° here. However, it can also have any other value between less than 90° and greater than 0°. The angular arrangement of the sensors S11-S14 allows the sensitivity of the sensors S11-S14 to be adjusted with respect to the magnetic fields 41, 42 or the resulting magnetic field resulting from them. The smaller the angle α to the longitudinal direction 30, the lower the sensitivity of the magnetic field sensors S11-S14 and the later the magnetic field sensors S11-S14 reach saturation as the flux density to which they are exposed increases.

Due to the arrangement of the magnetic field sensors S11-S14 between the conductor paths 21, 22, i.e. in a region of the reduced magnetic field, the magnetic field sensors S11-S14 can be compared to conventional devices according to the state of the art, such as the DE 10 2021 127 855 A1 , with a larger angle α to the longitudinal direction 30, for example in a range from less than 90° to 10°, optionally less than 90° to 15°, optionally less than 90° to 20°, optionally less than 90° to 25°, optionally less than 90° to 30°, optionally less than 90° to 35°, optionally less than 90° to 40°, optionally less than 90° to 45°, optionally less than 90° to 50°, optionally less than 90° to 55°, optionally less than 90° to 60°, optionally less than 90° to 65°, optionally less than 90° to 70°, optionally less than 90° to 75°, optionally less than 90° to 80°, optionally less than 90° to 85°.

The angles α of the magnetic field sensors S11-S14 can all have the same amount or can also have different angles α, in which case preferably two of the angles α each have the same amount.

The magnetic field sensors S11-S14 are arranged with respect to their center points 52 in the direction of their longitudinal axes L11-L14 at a common height or position P1 with respect to the longitudinal direction 30. The magnetic field sensors S11-S14 are arranged with their center points 52 further from the central longitudinal axis 34 at a distance 38* in the transverse direction 31.

10 shows schematically a side view of a sensor device 1 according to another embodiment. 11 shows schematically a top view of the sensor device 1. The sensor device 1 according to the 10 and 11 essentially corresponds to that of the 8 and 9 , with the exception of sensor arrangement 5.

The sensor arrangement 5 according to 10 and 11 comprises four magnetic field sensors S11, S12, S13, S14, each arranged at an angle α to the longitudinal direction 30 on a common first position P1. It further comprises four magnetic field sensors S21, S22, S23, S24, each arranged at an angle α to the longitudinal direction 30 on a common second position P2, which are analogous to the embodiments in 4-7 at a distance 51 from the first position P1.

The magnetic field sensors S11, S12, S21, S22 are assigned to the first conductor path 21. They are arranged with their longitudinal axes L11, L12, L21, L22 on a common plane that is oriented parallel to the longitudinal direction 30 or the central longitudinal axis 34 and parallel to the inner side 27 of the first conductor path 21.

The magnetic field sensors S13, S14, S23, S24 are assigned to the second conductor path 22. They are arranged with their longitudinal axes L13, L14, L23, L24 on a common plane that is oriented parallel to the longitudinal direction 30 or the central longitudinal axis 34 and parallel to the inner side 27 of the second conductor path 22.

In the present case, the magnetic field sensors S11-S24 are arranged such that the intersection points SP11, SP12 of the pairs of magnetic field sensors S11 and S12 as well as S13 and S14 lie on the side facing away from the second position P2 with respect to the first position P1, and the intersection points SP21, SP22 of the pairs of magnetic field sensors S21 and S22 as well as S23 and S24 lie on the side facing away from the first position P1 with respect to the second position P2. In other words, the magnetic field sensors S11-S24 have an O-arrangement with respect to the longitudinal direction 30.

Alternatively, the magnetic field sensors S11-S24 can also be arranged in an X arrangement. This means that the intersection points SP11, SP12 of the pairs of magnetic field sensors S11-S14 positioned at the first position P1 lie on the side facing the second position P2 with respect to the first position P1, and the intersection points SP21, SP22 of the pairs of magnetic field sensors S21 and S22 as well as S23 and S24 of the second position P2 lie on the side facing the first position P1 with respect to the second position P2.

Alternatively, the magnetic field sensors S11-S24 can also be arranged in a C-C arrangement. This means that the intersection points SP11, SP12 of the pairs of magnetic field sensors S11-S14 positioned in the first position P1 lie on the side facing away from the second position P2 with respect to the first position P1, and the intersection points SP21, SP22 of the pairs of magnetic field sensors S21 and S22 as well as S23 and S24 of the second position P2 lie on the side facing the first position P1 with respect to the second position P2, or vice versa.

Alternatively, the magnetic field sensors S11-S14 of the first position P1 may be inclined in the same direction, and/or the magnetic field sensors S21-S24 of the second position P2 may be inclined in the same direction.

The magnetic field sensors S11-S24 of the sensor arrangement 5 are accommodated in a housing 70, which according to this optional embodiment is designed as a potting compound body that is potted around the sensor arrangement 5 and cured.

The housing 70 can be shaped such that it can be inserted and fixed between the conductor paths 21, 22.

The in 10 The housing 70 shown is of course not limited to this embodiment, but can be used in all embodiments, in particular in combination with at least one carrier 6 (see 6 ).

12 shows schematically a side view of a sensor device 1 according to another embodiment. 13 shows schematically a sectional view through the sensor device 1 perpendicular to the longitudinal direction 30. The sensor device 1 essentially corresponds to that of the 1-3 , with the exception that the conductor paths 21, 22 are of different heights. The first conductor path 21, to which the sensor arrangement 5 is assigned, has a first height 23' which is smaller than the second height 23" of the second conductor path 22. In the present case, the height ratio of the first height 23' to the second height 23" is 1 to 3. Accordingly, the current components conducted through the conductor paths are not the same size, but are divided in a ratio of 1 to 3. The magnetic field 41 formed by current flow through the first conductor path 21 is correspondingly less strong than the magnetic field 42 formed by current flow through the second conductor path 22. The zero field region 43 is therefore not symmetrically spaced between the conductor paths 21, 22, but closer to the first conductor path 21. The zero field region 43 can be three-dimensional, as shown here. It can also be present merely as a line or point.

The second magnetic field sensor S12 also has a greater distance 33' from the second conductor path 22 than the first magnetic field sensor S11 has from the first conductor path 21 with its distance 33. The magnetic field sensors S11, S12 are arranged essentially symmetrically with respect to the zero field region 43, but are not limited to this. Due to the comparatively low resulting magnetic field between the conductor paths 21, 22 near the zero field region 43, the magnetic field sensors S11, S12 can be arranged with their longitudinal axes L11, L12 in the direction of the field lines of the magnetic fields 41, 42, i.e. perpendicular to the longitudinal direction 30 or to the central longitudinal axes 34.

14 shows schematically a side view of a sensor device 1 according to another embodiment. 15 shows schematically a sectional view through the sensor device 1 perpendicular to the longitudinal direction 30. The sensor device 1 essentially corresponds to that of the 1 to 3 , with the difference that instead of a sensor arranged centrally to the central longitudinal axis 34, two magnetic field sensors S11 and S12 assigned to the first conductor path 21 and two magnetic field sensors S13 and S14 assigned to the first conductor path 21 are provided, which are each arranged at a distance 38* in the transverse direction 31 from the central longitudinal axis 34 with respect to their center points 52, namely at the first position P1

As in 15 indicated by dashed lines, the sensor arrangement 5 can optionally also magnetic field sensors S21-S24 assigned to a second position. Such an embodiment would correspond to the embodiment of the 6 and 7 , wherein, as described above, two magnetic field sensors S11-S24 are arranged on a common longitudinal axis L11-L24.

Alternatively, the sensor arrangement can also comprise only the magnetic field sensors S11, S12, S21 and S22. Then advantageously at least one conductor path 21, 22 comprises at least one recess 72, as indicated by the dotted lines.

16 shows schematically a side view of a sensor device 1 according to another embodiment. 17 shows a schematic plan view of the sensor device 1. The sensor device 1 essentially corresponds to that of the 10 and 11 , whereby all magnetic field sensors S11-S24 are assigned to the first conductor path 21. In addition, the magnetic field sensors S11, S12, S21, S22 are arranged outside the conductor paths 21, 22. They are arranged at a predetermined distance 33 from the outside 26 of the first conductor path 21. The magnetic field sensors S13, S14, S23, S24 are arranged between the conductor paths 21, 22. They have a predetermined distance 33 from the inside 27 of the first conductor path 21.

18 shows schematically a side view of a sensor device 1 according to another embodiment. 19 shows a schematic plan view of the sensor device 1. The sensor device 1 essentially corresponds to that of the 10 and 11 and 16 and 17, whereby all magnetic field sensors S11-S24 are arranged outside the conductor paths 21, 22. The magnetic field sensors S11, S12, S21, S22 are analogous to the embodiment according to 16 and 17 with a predetermined distance 33 to the outside 26 of the first conductor path 21. The magnetic field sensors S13, S14, S23, S24 are arranged analogously with a predetermined distance 33 to the outside 26 of the second conductor path 22. This embodiment has proven to be particularly advantageous when the conductor paths 21, 22 have different heights 23', 23" (compare 12 to 15 ).

20 shows schematically a plan view of a sensor device 1 according to another embodiment. 21 shows a schematic sectional view through the sensor device 1 in the middle of the conductor paths 21, 22. The sensor device 1 essentially corresponds to that from the previous figures. However, the current conductor 20 is not divided in the vertical direction 32 here, but extends in a plane that is oriented parallel to the longitudinal direction 30 and the transverse direction 31. The conductor paths 21, 22 branch off from one another in the transverse direction 31.

The conductor paths 21, 22 and the current conductor 20 in the undivided state all have the same height 23. The width 24 of the conductor paths 21, 22 in their straight section in the area of the sensor arrangement 5 corresponds to half the width 24* of the undivided current conductor 20.

The sensor arrangement 5 essentially corresponds to that of 10 and 11 . Their magnetic field sensors S11-S24 are all assigned to the second conductor path 22. In relation to the conductor paths 21, 22, the magnetic field sensors S11-S24 are each arranged on a lateral side 28, 29 of the second conductor path 22. The magnetic field sensors S11, S12, S21, S22 are arranged on a first lateral side 28 of the second conductor path 22 and the magnetic field sensors S13, S14, S23, S24 are arranged on a second lateral side 29 of the second conductor path 22.

22 shows schematically a plan view of a sensor device 1 according to another embodiment. 23 shows schematically a sectional view through the sensor device 1 centered through the conductor paths 21, 22. The sensor device 1 essentially corresponds to that of 20 and 21 , where half of the magnetic field sensors S11-S24 are assigned to the first conductor path 21 and the other half are assigned to the second conductor path 22.

24 shows schematically a side view of a sensor device 1 according to another embodiment. 25 shows a schematic plan view of the sensor device 1. The sensor device 1 essentially corresponds to that of the 14 and 15 , if it only comprises the magnetic field sensors S11, S12, S13 and S14 and the conductor paths 21, 22 are symmetrical, as for example in 3 shown. Furthermore, the magnetic field sensors S11-S14 are not arranged symmetrically to the central longitudinal axis 34, but laterally offset from it. In the present case, the magnetic field sensors S11, S13 are arranged centrally to the central longitudinal axis 34. They are interconnected and together form a first sensor path, i.e. a first channel CH1. Alternatively, the magnetic field sensors S11, S13 can also be arranged at a predetermined distance from the central longitudinal axis 34. The magnetic field sensors S12, S14 are arranged at a predetermined distance 38* from the central longitudinal axis 34. Together they form a second channel CH2.

Due to this asymmetrical arrangement of the channels CH1, CH2 transverse to the central longitudinal axis 34, the output signals S1 of the first channel CH1 and the output signals S2 of the second channel CH2 are different when a current of strength I is passed through, since their magnetic field sensors S11-S14 are exposed to different flux densities. The output signals S1, S2, which are caused purely by the magnetic fields generated via the current flow through the conductor 20, are in a fixed ratio V = S1/S2. In 26 the curves of the output signals S1, S2 of the channels CH1 and CH2 are indicated over the current I. This embodiment allows the presence or influence of an external field to be detected particularly effectively. If the ratio V(actual) of the output signals S1, S2 resulting from the measured values of the channels CH1, CH2 deviates from the previously specified ratio V resulting purely from the current flow, this is an indicator of the presence of an external interference field. 27 shows schematically a side view of a sensor device 1 according to another embodiment. 28 shows a schematic plan view of the sensor device 1. The sensor device 1 essentially corresponds to that of the 24 and 25 , whereby the sensors S11-S14 are arranged symmetrically with respect to the central longitudinal axis 34, i.e. at the same distance 38*. To achieve the different output signals S1, S2, the conductor paths 21, 22 include a recess 72 at the same location. As a result, the height and vector orientation of the magnetic field, more precisely the flux density, are different for the channels CH1 and CH2, as in 29 analogous to 26 indicated.

30 shows schematically a side view of a sensor device 1 according to another embodiment. 31 shows a schematic plan view of the sensor device 1. The sensor device 1 essentially corresponds to that of the 6 and 7 . The magnetic field sensors S21 and S22 are connected to a first channel CH1 and the magnetic field sensors S11 and S12 are connected to a second channel CH2. The magnetic field sensors S11, S12 of the second channel CH2 are arranged in a region of the conductor paths 21, 22 in which they have a first cross-sectional shape. The magnetic field sensors S21, S22 of the first channel CH1 are arranged in a region of the conductor paths 21, 22 in which they have a second cross-sectional shape that is different from the first cross-sectional shape. Due to the different cross-sectional shapes, here a different width in the transverse direction 31, the resulting flux density is different at the positions of the magnetic field sensors S11, S12 and at the positions of the magnetic field sensors S21, S22. Accordingly, when using the same magnetic field sensors S11-S22, different output signals S1 and S2 are formed, analogous to the 26 and 29 , as for the present embodiment in 32 indicated.

33 shows schematically a side view of a sensor device 1 according to another embodiment. 34 shows a schematic top view of the sensor device 1. Here, the conductor paths 21, 22 are each S-shaped. In other words, they each comprise a first region 80 extending in the longitudinal direction 30, to which a region 81 extending in the opposite direction to the longitudinal direction 30 adjoins in parallel, to which in turn a further region 82 extending in the longitudinal direction 30 adjoins in parallel. The direction 83 of the current flow in the regions 81-82 is alternating.

Each area 81-82 is assigned magnetic field sensors S11 - S32 forming a channel CH1-CH3, each analogous to the embodiment according to the 1-3 In the present case, the measuring direction of the magnetic field sensors S11, S21, S31, indicated by the arrows designated by reference number 84, is oriented in the same direction. In addition, the measuring direction of the magnetic field sensors S12, S22, S32 is the same. Consequently, the output signal of channel CH3 is opposite to the output signals of channels CH1 and CH2.

By comparing at least two of the output signals of channels CH1, CH2 and CH3, the presence of an external interference field can be determined.

The formation of the different output signals S1 to S3 or CH1 to CH3 is analogous to the 26 , 29 and 32 , for this embodiment in 35 indicated.

The 36 to 38 show three schematic views of a three-panel image of a sensor device 1 according to a further embodiment. In the present case, the sensor paths 21, 22 are U-shaped. They extend from a first connection 92 for connection to a busbar arrangement to a second connection 93 for connection to the busbar arrangement. The U-shape comprises two side flanks 90 arranged parallel to one another, which are connected via a central part 91 arranged transversely to them. The sensor arrangement 5 comprises at least two magnetic field sensors S11, S12 arranged in the region of the first side flank 90, which form a first channel CH1, and at least two magnetic field sensors S21, S22 arranged in the region of the second side flank 90, which form a second channel CH2. Due to the opposing directions 83 of the current flow in the first and second side flanks 80, an evaluation of the output signals of the channels CH1 and CH2, for example by forming a differential of the values of the output signals of the channels CH1 and CH2 or by relating the values of the output signals to each other, can be used to determine the presence of an external interference field can be concluded.

Optionally, the sensor device 5 further comprises at least two magnetic field sensors S31, S32 arranged in the middle part 91, which can form a third channel CH3. Optionally, the conductor paths 21, 22 and the sensor arrangement 5 can be provided as an assembly, here as an installation unit for installation in a busbar arrangement.

The formation of the different output signals S1 to S3 or CH1 to CH3 is analogous to the 26 , 29 , 32 and 35 , for this embodiment in 39 indicated.

40 shows a side view of a sensor device 1 according to a further embodiment, in which the conductor paths 21, 22 are U-shaped. Unlike in the previous embodiment, the U-shape extends in the vertical direction 32. The first conductor path 21 therefore extends around the second conductor path 22. In the area of the side flanks 90, analogous to 1 to 3 At least two magnetic field sensors S11, S12 and S21, S22 are arranged between the conductor paths 21, 22, each forming a channel CH1 and CH2.

Optionally, at least two further magnetic field sensors S31, S32 can be arranged between the first side flank of the second conductor path 22 and the second side flank of the second conductor path 22, which can form a further channel CH3. Optionally, the conductor paths 21, 22 and the sensor arrangement 5 can be provided as an assembly, here as an installation unit for installation in a busbar arrangement.

The formation of the different output signals S1 to S3 or CH1 to CH3 is analogous to the 26 , 29 , 32 , 35 and 39 , for this embodiment in 41 indicated.

42 shows a vehicle battery 100 for providing the primary drive energy of an electric vehicle (not shown). It comprises a plurality of battery modules 110 for providing an electrical voltage, each of which comprises a plurality of electrically contacted battery cells (not shown). The vehicle battery 100 further comprises a sensor device 1 according to one of the above embodiments. The embodiment according to 1 to 3 However, it can also comprise any other embodiment of the sensor devices 1 described in order to determine the current flowing through the current conductor 20 designed as a busbar for contacting the battery modules 110 during operation of the electric vehicle.

Where applicable, all individual features shown in the embodiments may be combined and/or exchanged without departing from the scope of the invention.

list of reference symbols

1

sensor device

5

sensor arrangement

6

carrier

7

enclosure

20

conductor

21

First Ladder Path

22

Second Ladder Path

23

height of a ladder path

24

width of a conductor path

24*

width of the undivided conductor

25

height of the undivided conductor

26

outside

27

inside

28

lateral side

29

lateral side

30

longitudinal direction

31

transverse direction

32

altitude direction

33

distance to the assigned conductor path

33*

distance to the other conductor path

34

central longitudinal axis

35

extension of the conductor paths in the longitudinal direction

36

Route

37

Distance to

38

Distance to the axis of symmetry in the height direction

38*

Distance to the central longitudinal axis in the transverse direction

39

distance

41

First magnetic field (formed by current flow in the first conductor path)

42

Second magnetic field (formed by current flow in the second conductor path)

43

zero-field region

50

distance in the vertical direction

51

distance in the longitudinal direction

52

center

60

First side of the carrier

62

Second side of the carrier

70

enclosure

72

recess

80-82

areas of the conductor paths

83

direction of current flow

84

measuring direction

90

side flank

91

middle part

100

vehicle battery

110

battery module

P1

First Position

P2

Second Position

S11-S14

Magnetic field sensor on the first position P1

S21-S24

Magnetic field sensor on the second position P2

L11-L14

Longitudinal axis of a magnetic field sensor at the first position P1

L21-L24

Longitudinal axis of a magnetic field sensor at the second position P2

SP11-SP22

intersection of two longitudinal axes

α

angle of the longitudinal axis to the longitudinal direction

Claims (13)

Sensor device (1) for determining a current flowing through a current conductor (20), preferably for determining a current flowing through a busbar of a vehicle battery (100), comprising a current conductor (20) for conducting a current along a longitudinal direction (30) and a sensor arrangement (5) of magnetic field sensors (S11-S24) for detecting a magnetic field formed around the current conductor (20) via current flow in the current conductor (20), wherein the current conductor (20) in the region of the sensor arrangement (5) is divided into at least two conductor paths (21, 22) running in the longitudinal direction (30) and spaced apart from one another, characterized in that at least two of the magnetic field sensors (S11-S24) are connected to a first channel (CH1) and at least two other of the magnetic field sensors (S11-S24) are connected to a second channel (CH2), wherein each channel (CH1, CH2) has its own signal (S1, S2), wherein the signal (S1) of the first channel (CH1) and the signal (S2) of the second channel (CH2) can be set in the ratio (V) for detecting the presence of an external interference field. Sensor device (1) according to claim 1 , characterized in that at least one magnetic field sensor (S11-S24) of the sensor arrangement (5) is arranged between the conductor paths (21, 22), wherein preferably at least two magnetic field sensors (S11-S24) are arranged between the conductor paths (21, 22). Sensor device (1) according to claim 1 or 2 , characterized in that all magnetic field sensors (S11-S24) of the sensor arrangement (5) are arranged between the conductor paths (21, 22). Sensor device (1) according to claim 1 or 2 , characterized in that at least one magnetic field sensor (S11-S24) of the sensor arrangement (5) is arranged outside the conductor paths (21, 22) with respect to the conductor paths (21, 22). Sensor device (1) according to claim 1 or 4 , characterized in that all magnetic field sensors (S11-S24) of the sensor arrangement (5) are arranged outside the conductor paths (21, 22) with respect to the conductor paths (21, 22), wherein preferably at least one magnetic field sensor (S11-S24) is arranged on an outer side (26) of the first conductor path (21) and/or at least one magnetic field sensor (S11-S24) is arranged on an outer side (26) of the second conductor path (22). Sensor device (1) according to one of the preceding claims, characterized in that at least one magnetic field sensor (S11-S24) of the sensor arrangement (5) is assigned to one conductor path (21, 22) and preferably at least one magnetic field sensor (S11-S24) of the sensor arrangement (5) is assigned to the other conductor path (22). Sensor device (1) according to one of the preceding claims, characterized in that at least one magnetic field sensor (S11-S24) of the sensor arrangement (5) is arranged in a zero field region (43) between the first conductor path (21) and the second conductor path (22). Sensor device (1) according to claim 1 , characterized in that at least one magnetic field sensor (S11-S24) of the sensor arrangement (5) is arranged on a lateral side (28, 29) of one of the conductor paths (21, 22) relative to the conductor paths (21, 22), wherein preferably at least one magnetic field sensor (S11-S24) is arranged on a lateral side (28, 29) of the first conductor path (21) and at least one magnetic field sensor (S11-S24) is arranged on a lateral side (28, 29) of the second conductor path (22). Sensor device (1) according to one of the preceding claims, characterized in that at least two magnetic field sensors (S11-S24) of the sensor arrangement (5) are arranged on a common carrier (6), preferably a common circuit board, and/or at least one magnetic field sensor (S11-S24) is arranged on a first side (60) of the common carrier (6) and at least one magnetic field sensor (S11-S24) is arranged on a second side (61) of the common carrier (6) opposite the first side (60), and/or that at least one magnetic field sensor (S11-S24) is at least partially accommodated in a housing (7), preferably at least partially embedded in a potting compound body. Sensor device (1) according to one of the preceding claims, characterized in that the sensor arrangement (5) comprises at least two magnetic field sensors (S11-S24) which are arranged at the same position (P1, P2) with respect to the longitudinal direction (30), and/or the sensor arrangement (5) comprises at least one magnetic field sensor (S11-S14) arranged at a first position (P1) with respect to the longitudinal direction (30) and at least one magnetic field sensor (S21-S24) arranged at a second position (P2) with respect to the longitudinal direction (30). Sensor device (1) according to one of the preceding claims, characterized in that at least two magnetic field sensors (S11-S24) of the sensor arrangement (5) are arranged with an angle (α) of preferably the same amount to the longitudinal direction (30), and/or that at least two magnetic field sensors (S11-S24) are oriented parallel to one another, and/or that at least two magnetic field sensors (S11-S24) are oriented perpendicular to the longitudinal direction (30). Sensor device (1) according to one of the preceding claims, characterized in that the magnetic field sensors (S11-S24) of the sensor arrangement (5) are designed as coils, and/or that the current conductor (20) is a busbar for conducting current in a vehicle battery (100), and/or that exactly two or exactly four magnetic field sensors (S11-S24) of the sensor arrangement (5) are each connected to one channel (CH1, CH2). Vehicle battery (100) for providing the primary drive energy of an electric vehicle, comprising at least one battery module (110) for providing an electrical voltage, characterized by a sensor device (1) according to one of the preceding claims.

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