Charging arrangement for determining a connection position between a charging contact and a charging port

Abstract

Charging arrangement (1),- with an electric vehicle (2) which has a charging port (5) electrically connected to an energy storage device (6) of the electric vehicle (2),- with a charging station (4) for automated charging of the energy storage device (6), which has a charging contact (7) that can be contacted with the vehicle-side charging port (5) and a positioning unit (9), wherein the positioning unit (9) is configured to determine a connection position of the charging port (5) and to align the charging contact (7) with the charging port (5) based on the connection position, wherein the charging port (5) defines at least two reference lines (104, 105) determinable by the positioning unit (9) for determining the connection position, via which a theoretical center point (107) of the charging port (5) can be determined, wherein the charging port (5) defines one of the reference lines (104,105) defining reference geometry (13) and the positioning unit (9) has a sensor device (10) for detecting the reference geometry (13), wherein the reference geometry (13) is defined with respect to a reference coordinate system (103) by two longitudinal line segments (16) extending in a y-direction and at least one transverse line segment (17) extending in an x-direction, wherein a first reference line (104) is arranged centrally between the two longitudinal line segments (16) and a second reference line (105) lies on the transverse line segment (17), wherein the theoretical center point (107) on the first reference line (104) is arranged at a distance (109) from an intersection point (108) of the first and second reference lines (104, 105), characterized in that the reference geometry (13) is defined by at least two optical detectable reference contours (14) are formed, which are designed as profiles offset from the charging port.

Description

The invention relates to a charging arrangement for charging an energy store of an electric vehicle having the features of the preamble of claim 1.Various systems for charging electric vehicles are known from the prior art, such as WEVC (Wireless Electric Vehicle Charging), ACDS (Automatic Connecting Device for Conventional Side Connecting Interface) or ADU (Automatic Connecting Underbody Device). In the underbody systems, such as ADU, additional hardware in the vehicle and the floor establishes a conductive connection at the underside of the vehicle to charge the vehicle. For example, a relative position between the connections on the vehicle and on the floor can be determined in order to produce the conductive connection.The document WO 2022 / 000 006 A1 discloses a method for interaction, in particular for energy exchange, between a first device, such as a charging device, and a second device, such as an electric vehicle, wherein the first device has a first module with a first interaction element and the second device has a second module with a second interaction element, wherein after an interaction position of the devices for roughly positioning the interaction elements is assumed, the interaction elements are moved relative to one another, in particular are brought closer to one another, for fine positioning of the interaction elements, in order to interact with one another, wherein a relative position between the interaction elements is determined with a positioning system for controlling the fine positioning. DE 10 2015 225 988 A1 shows a charging arrangement according to the preamble of claim 1. Further prior art is disclosed in DE 10 2015 225 986 A1, KR 10 2023 0 092 653 A, DE 10 2019,122 158 A1, DE 10 2018 130 865 A1 and DE 10 2019,040 A1.It is the object of the present invention to propose a charging arrangement which makes it possible to detect a connection position in a simple manner. It is a further object of the invention to propose a corresponding method.This object is achieved by a charging arrangement having the features of claim 1. Preferred or advantageous embodiments of the invention are evident from the dependent claims, the following description and the appended figures.The invention relates to a charging arrangement having an electric vehicle and having a charging station which is designed and / or suitable for the automated charging of an energy store of the electric vehicle. An electric vehicle may be understood to mean both a battery electric electric vehicle (BEV) and a hybrid electric vehicle (HEV). The energy store is preferably designed as a traction battery of the electric vehicle. The charging station can be designed as an automatically connecting charging station, also referred to as an automatic connection device (ACD). The charging station can establish an electrical connection from a vehicle side, also as an automatic connecting device for conventional side connecting interface (ACDS), or from an underbody, also as an automatic connecting underbody device (ADU). The charging station can be permanently connected to an energy source or a power source. Alternatively, however, the charging station can also be equipped with an energy store, for example a battery module. The charging station is preferably stationary or mobile or drivable.The electric vehicle has a charging connection electrically connected to the energy store of the electric vehicle. In principle, the charging connection can be designed as a conventional charging connection in the front or rear region, in particular in the region of the rear lighting system, or in the region of the rear or front wheels. However, the charging connection is preferably designed as an underbody charging connection which is arranged on an underside of the electric vehicle.The charging station has a charging contact contactable with the vehicle-side charging connection. In particular, an electrical connection can be produced between the charging contact and the charging connection, via which connection a charging process of the energy store can be carried out. Preferably, the charging contact and the charging connection can be contacted with one another conductively, preferably via a plug connection. For this purpose, the charging contact preferably comprises a charging plug and the charging connection a charging socket. Particularly preferably, the charging plug and the charging socket are circular.Furthermore, the charging station has a positioning unit which is designed to determine a connection position of the charging connection and to align the charging contact with the charging connection on the basis of the connection position. In particular, the positioning unit enables the position of the charging contact to be matched to the connection position of the charging connection during a vehicle standstill. The connection position can be understood to mean a position of the charging connection into which the charging contact must be transferred in order to connect it to the charging connection. Preferably, the positioning unit is configured to move the charging contact relative to the charging connection in order to form or disconnect the electrical connection between the charging contact and the charging connection. Preferably, in the case of a correctly positioned arrangement, the charging contact is congruent in the connection position and / or aligned coaxially with respect to the charging connection.Within the scope of the invention, it is proposed that the charging connection defines at least or exactly two reference straight lines, which can be determined by the positioning unit and by means of which a theoretical center point of the charging connection can be determined, for determining the connection position. The reference lines preferably serve for fine positioning of the charging contact. In particular, the positioning unit is configured to determine the reference straight lines by sampling the charging connection on the basis of sampling points. The reference straight lines preferably lie in a common plane of a reference coordinate system, preferably an x-y plane. Particularly preferably, the positioning unit is designed to represent the reference straight lines in a sensor image. A theoretical center point of the charging connection can be understood to mean, for example, a geometric center point of the charging connection, preferably of the charging socket. The reference straight lines can be, for example, straight lines which are oriented parallel to a movement direction and / or scanning direction of the charging contact. The reference lines are preferably arranged and / or aligned in such a way that exactly one single center point can always be unambiguously determined.The advantage of the invention is that by defining reference lines at the charging connection, a vehicle-side sensor or transmitter for determining the connection position can be dispensed with. A positioning unit is thus proposed which makes it possible to find the charging connection of the vehicle with fewer or no sensors on the side of the vehicle. As a result, a charging arrangement can be created which is designed to be particularly simple and cost-effective.In a specific implementation, it is provided that the theoretical center point is defined by an intersection point of the at least two reference straight lines. In particular, for this purpose, exactly two reference straight lines are defined by the charging connection, which straight lines intersect at exactly one intersection point, which simultaneously forms the theoretical center point. A charging connection is thus proposed, which has a minimum number of reference lines and enables very simple position determination.In an alternative implementation, it is provided that the theoretical center point, starting from an intersection point of the at least two reference straight lines, is defined by a defined distance along one of the reference straight lines. In particular, at least or exactly two reference lines are defined for this purpose by the charging connection, which lines intersect at exactly one intersection point which is arranged at a distance from the theoretical center point. The theoretical center point can be situated here optionally on one of the two reference straight lines or on a further reference or auxiliary straight line running through the intersection point. A charging connection is thus proposed, which can be realized in a structurally simpler manner. In addition, the further reference straight line can improve the accuracy in the determination of the connection position, since possible measurement inaccuracies can be averaged by many sampling points.According to the invention, it is provided that the underbody charging connection has a reference geometry defining the reference straight lines and the positioning unit has a sensor device detecting the reference geometry. In particular, the reference straight lines can be determined by scanning the reference geometry, preferably by at least two scanning points in each case. In particular, the sensor device is configured to scan the reference geometry optically and / or acoustically and / or inductively and / or capacitively and / or magnetically. The reference geometry can be represented by an image of the reference geometry, e.g. an image recording, and / or by a plurality, preferably a plurality, of sampling points in the sensor image. In principle, the reference straight lines can be defined by exactly two sampling points in each case, the sampling points lying on the reference straight line. Alternatively, however, the reference straight lines can also be defined by more than two sampling points, wherein the sampling points are optionally located on the reference straight line or are arranged at a distance from the reference straight line. With a spaced arrangement of the sampling points, the reference straight line between the sampling points can be drawn with a defined uniform distance from the sampling points. By providing the reference geometry at the charging connection, the latter can be designed in a particularly simple and cost-effective manner.In one refinement, it is provided that the reference geometry is formed by at least or exactly two optically detectable reference contours. The reference contours are formed by profiles and / or embossings, which can be detected by means of a distance measurement. For example, the sensor device can comprise one or more laser, lidar or camera sensors in order to optically capture the reference contours. In this case, the reference contours are formed or offset with respect to the charging connection in such a way that they can be detected unambiguously as the reference contours by the sensor device. In particular, the charging contact and the sensor device can be accommodated in a common housing. The sensor device preferably has a plurality of optical sensors which are arranged on a common pitch circle around the charging contact. A charging connection is thus proposed which makes it possible to define the reference straight line in a simple manner by means of a geometric form impression.In an alternative or supplementary specification, it is provided that the reference geometry is formed by at least two magnetically detectable reference magnets. The reference magnets can be designed as permanent magnets, preferably bar magnets, which can be detected by means of a magnetic field measurement. For example, the sensor device can comprise one or more Hall sensors in order to magnetically detect the reference magnets. In particular, the charging contact and the sensor device can be accommodated in a common housing. A charging connection is thus proposed which makes it possible to define the reference straight line in a simple manner by integrating magnets.In a development, it is provided that the reference geometry with respect to a reference coordinate system is defined by two longitudinal straight line sections extending in a y direction and at least one transverse straight line section extending in an x direction. In particular, the reference coordinate system is defined by a vehicle coordinate system, wherein the y direction corresponds to a vehicle longitudinal direction and the x direction corresponds to a vehicle transverse direction. The longitudinal straight line sections are preferably designed as two parallel and / or equally long straight line sections, which delimit and / or frame the charging connection in the x direction or vehicle transverse direction. The transverse straight line section is preferably designed as a straight line section connecting the two longitudinal straight line sections, which limits and / or frames the charging connection in the y direction or vehicle longitudinal direction.According to this further development, it is provided that a first reference straight line is arranged centrally between the two longitudinal straight line sections and a second reference straight line lies on the transverse straight line section, wherein the theoretical center point is arranged on the first reference straight line at a distance from an intersection point of the first and second reference straight lines. In particular, the first reference straight line is arranged parallel to the two longitudinal straight line sections and / or perpendicular to the second reference straight line. Preferably, the intersection point on the transverse straight line section and the center point between the two longitudinal straight line sections lies within the delimited region. To identify the reference straight line, at least six sampling points must be detected, wherein in this case at least two sampling points must lie on one of the straight line segments in each case. A reference geometry is thus proposed which is distinguished by a high measurement accuracy.In an alternative development, it is provided that the reference geometry is defined with respect to the reference coordinate system by two straight line sections arranged at an angle to one another in the y direction. The straight line sections are preferably arranged with an angle of at least or exactly 90 degrees, preferably less than 70 degrees, in particular less than 50 degrees, with respect to one another, wherein a bisector is directed axially parallel to the y-axis or to the vehicle longitudinal axis. Preferably, the two straight line sections are directed in the direction of the charging connection and / or are aligned convergingly. Shown in simplified form, the two straight line sections are arranged in a V-shape. It is preferably provided that the two straight line sections are spaced apart from one another and / or are not connected to one another.According to this further development, it is provided that a first reference straight line lies on one straight line section and a second reference straight line lies on the other straight line section, wherein the theoretical center point is formed by an intersection point of the two reference straight lines. Shown in simplified form, the two straight line sections aim at the charging connection. To identify the reference straight line, at least four sampling points must be detected, wherein in this case at least two sampling points must lie on one of the straight line segments in each case. A reference geometry is thus proposed which is distinguished by a particularly simple reference geometry and can be detected in a short time.In an alternative development, it is provided that the reference geometry is defined with respect to the reference coordinate system by two straight line sections arranged at an angle to one another in the y direction and a longitudinal straight line section extending centrally between the two straight line sections in the y direction. The straight line sections are preferably arranged with an angle of at least or exactly 90 degrees, preferably less than 70 degrees, in particular less than 50 degrees, with respect to one another, wherein the longitudinal straight line section lies on a bisector. Preferably, the two straight line sections and the longitudinal straight line section are directed in the direction of the charging connection. Shown in simplified form, the straight line sections are arranged in a Y-shape. It is preferably provided that the two straight line sections and the longitudinal straight line section are spaced apart from one another and / or are not connected to one another. In particular, the charging connection is bounded in the x direction or in the vehicle transverse direction by the two straight line sections.According to this further development, it is provided that a first reference straight line lies on the one straight line section, a second reference straight line lies on the other straight line section, and a third reference straight line lies on the longitudinal straight line section, wherein the theoretical center point is arranged on the third reference straight line at a distance from an intersection point of the first and second reference straight lines. In particular, the third reference straight line forms the angle bisector of the first and second reference straight lines. Preferably, the intersection point on the third reference straight line and / or the longitudinal straight line section and the center point between the two straight line sections lie within the delimited region. Shown in simplified form, the two straight line sections and the longitudinal straight line section aim at the charging connection. To identify the reference straight line, at least six sampling points must be detected, wherein in this case at least two sampling points must lie on one of the straight line segments in each case. A reference geometry is thus proposed which is distinguished by a high measurement accuracy.A further subject matter of the invention relates to a method for determining the connection position between the charging contact and the underbody charging connection of the charging arrangement, as has already been described above. In the context of the method, at least or exactly two reference straight lines of the charging connection are determined; a theoretical center point is determined as the connection position of the underbody charging connection on the basis of the reference straight lines and the charging contact is aligned with the theoretical center point. In particular, the reference straight lines are determined by scanning a reference geometry and are represented in a sensor image with respect to a reference coordinate system. Particularly preferably, the reference geometry can be represented by detecting a plurality of scanning points in the sensor image. The reference straight lines can subsequently be represented and / or determined on the basis of the sampling points and / or the reference geometry in the sensor image. The theoretical center point can then be determined with respect to an intersection point of the reference straight line. The center point can be determined or determined by the intersection point itself or a defined distance from the intersection point. Based on the theoretical midpoint, a control signal may be generated and the charging contact may be aligned with the midpoint based on the control signal.In a specific implementation, it is provided that a reference travel is carried out for determining the reference straight line, wherein the reference geometry of the charging connection is scanned in the context of the reference travel and at least two scanning points of the reference geometry are detected for each reference straight line. For this purpose, the sensor device is moved in a connection region of the charging connection, which makes it possible to measure sufficient sampling points in order to find the reference straight line. For example, the sensor device is moved for this purpose alternately in the y direction and the x direction over the connection region until sufficient sampling points are available. In particular, a reference travel may be required in the case of simple laser sensors which can measure only one point. The charging arrangement can thus also be equipped with cost-effective sensors.Further features, advantages and effects of the invention will become apparent from the following description of preferred exemplary embodiments of the invention. The following shows: FIG. 1 shows a schematic illustration of a charging arrangement as an exemplary embodiment of the invention; FIG. 2 shows a specific implementation of the charging arrangement in a perspective illustration from below; FIG. 3 shows a schematic illustration of a sensor image of the shop arrangement according to FIG. 2 ; FIG. 4 shows an alternative embodiment of the sensor image in the same illustration as shown in FIG. 3 ; FIG. 5 shows a further alternative embodiment of the sensor image in the same illustration as shown in FIG. 3 ; FIG. 6 shows the charging arrangement according to FIG. 2 in a view from below with a possible scanning path during a scanning travel.FIG. 1 shows a highly schematic side view of a charging arrangement 1. the charging arrangement 1 comprises an electric vehicle 2 which is arranged or parked on a floor surface 3. Furthermore, the charging arrangement 1 has a charging station 4, which is arranged at least partially recessed into the floor surface 3 below the electric vehicle 2. For example, the charging station 4 is an underbody charging station, also known as an ADCU (Automatic Connecting Vacuum Device).The electric vehicle 2 has a charging connection 5 located on the underbody, which is electrically connected to an energy store 6, for example a traction battery, of the electric vehicle 2. The charging station 4 has a charging contact 7 which can be electrically contacted with the charging connection 5 in order to supply the energy store 6 with electrical energy. For this purpose, the charging station 4 is connected to an energy source 8, which supplies the charging contact 7 with electrical energy. For this purpose, the charging contact 7 can comprise a charging plug and the charging connection 5 a charging socket, which are contacted with one another via a plug connection.In order to position the charging contact 7 in the correct position with respect to the charging connection 5, the charging station 4 has a positioning unit 9, which substantially comprises a sensor device 10, a control device 11 and an actuating device 12. The sensor device 10 is designed to detect a connection position of the charging connection 5, wherein the control device 11 is designed to actuate the actuating device 12 on the basis of the connection position in order to align the charging contact 7 with the connection position. The adjusting device 12 can be a combination of a rotational and linear drive or else a robot arm. In the connection position, the charging contact 7 is aligned in the correct position, preferably coaxially with respect to a central axis 100, with respect to the charging connection. The charging contact 7 can then be extended in the direction of the charging connection 5 or in the axial direction with respect to the central axis 100 in order to produce a plug connection with the charging connection 5.FIG. 2 shows the charging connection 5 and the charging contact 7 with the sensor device 10 in a perspective illustration. The sensor device 10 is here integrated into the charging contact 7, preferably a housing. The charging connection 5 has a reference geometry 13 detectable by the sensor device 10 for determining the connection position 5. In the exemplary embodiment shown, the reference geometry 13 is formed by a reference contour 14 surrounding or surrounding the charging connection 5, which is formed by a defined geometric profile or embossing. The reference contour 14 can be offset or emphasized with respect to the charging connection 5. The reference contour 14 can be detected, for example, by means of a distance measurement by the sensor device 10, wherein the sensor device 10 comprises a plurality of sensors 20 for this purpose. The sensors 20 can be configured, for example, for laser, lidar or photogrammetry measurement in order to capture the reference contour 14 with sufficient accuracy. The number of sensors 20 depends on the one hand on the sensor type and the time available for the measurement. For example, the sensors 20 are arranged lying on a common pitch circle and / or concentrically around the charging contact 7.Alternatively or optionally additionally, the reference geometry 13 can be formed by one or more reference magnets 15 surrounding or surrounding the charging connection 5, which can be formed by one or more permanent magnets integrated in the region of the reference contour 14. The reference magnets 15 can be detected by the sensor device 10, for example, by means of a magnetic field measurement, wherein the sensor device 10 comprises one or more sensors 20 for this purpose, which are designed, for example, as Hall sensors.In the exemplary embodiment shown, the reference geometry 13 is formed by two longitudinal straight line sections 16 extending in the vehicle longitudinal direction 101 and by a transverse straight line section 17 extending in the vehicle transverse direction 102. The charging connection 5 is thus bounded in the vehicle transverse direction 102 by the two longitudinal straight line sections 16 and in the vehicle longitudinal direction 101 by the transverse straight line section 17.FIG. 3 shows a two-dimensional sensor image 18 which is generated by scanning the reference geometry 13 by means of the sensor device 10. For example, the control device 11 can be equipped with a corresponding hardware or software module for this purpose, which can generate the sensor image 18 based on the sensor data.In the sensor image 18, the two longitudinal straight line sections 16 and the transverse straight line section 17 are shown in an x-y plane with respect to a reference coordinate system 103, wherein a y direction corresponds to the vehicle longitudinal direction 101 and an x direction corresponds to the vehicle transverse direction 102. By the arrangement of the longitudinal and transverse straight line sections 16, 17, at least two reference straight lines 104, 105 can be determined, which are entered in the sensor image 18 for determining the connection position of the charging connection 5. If at least two reference straight lines 104, 105 are present, each point of the x-y plane can be determined with coordinate knowledge. The position and orientation of the reference straight lines 104, 105 is selected such that a theoretical center point 107 of the charging connection 5 in the x-y plane can be found on the basis thereof, which corresponds to the connection position of the charging connection 5.In this exemplary embodiment, the first reference straight line 104 can be determined from the two longitudinal straight line sections 16 which run parallel to the y-axis. For this purpose, the first reference straight line 104 is arranged centrally between the two longitudinal straight line sections 17 and is oriented parallel to the y-axis. From the transverse straight line section 17, which runs parallel to the x-axis, the second reference straight line 105 can be determined. For this purpose, the second reference straight line 105 lies on the transverse straight line section 17 and is aligned parallel to the x-axis. The two reference straight lines 104, 105 intersect at an intersection point 108, wherein the theoretical center point 107, starting from the intersection point 108, lies on the first reference straight line 104 at a distance 109 from the intersection point 108. In order to align the charging contact 7 to the center 107 and thus to the connection position, a distance of zero from the first reference straight line 104 and the distance 109 from the second reference straight line 105 are required. Based on the sensor image 18, the control device 11 can actuate the actuating device 12 in order to transfer the charging contact 5 into the connection position.FIG. 4 shows an alternative sensor image 18, which is based on an alternative configuration of the reference geometry 13. The reference geometry 13 has two straight line sections 19 arranged at an angle to one another with respect to the y-axis. For example, the straight line sections 19 are arranged at an angle 110 of approximately 90 degrees with respect to one another, wherein an angle bisector runs parallel to the y-axis or to the vehicle longitudinal direction 101. The first reference straight line 104 can be determined by the one straight line section 19 and the second reference straight line 105 by the other straight line section 19. For this purpose, the first reference straight line 104 lies on the one straight line section 19 and the other reference straight line 105 lies on the other straight line section 20, and the two reference straight lines 104, 105 intersect at an intersection point 108 which simultaneously forms the theoretical center 107. In order to align the charging contact 7 with the center 107 and thus with the connection position, a distance of zero from the two reference lines 104, 105 is required.FIG. 5 shows a further alternative sensor image 18, which is based on a further alternative configuration of the reference geometry 13. In addition to the two straight line sections 19 arranged at an angle to one another with respect to the y-axis, as shown in FIG. 3, the reference geometry 13 additionally has a longitudinal straight line section 16 which extends parallel to the y-axis or in the vehicle longitudinal direction 101. The first reference straight line 104 can be determined by the one straight line section 19 and the second reference straight line 105 by the other straight line section 19. In addition, a third reference straight line 106 can be defined by the longitudinal straight line section 16, which runs parallel to the y-axis. For this purpose, the first reference straight line 104 lies on the one straight line section 19, the other reference straight line 105 lies on the other straight line section 20 and the third reference straight line 106 lies on the longitudinal straight line section 16. The three reference straight lines 104, 105, 106 intersect at a common intersection point 108, wherein the theoretical center point 107 starting from the intersection point 108 lies on the third reference straight line 106 at a distance 109 from the intersection point 108. In order to align the charging contact 7 with the center 107 and thus with the connection position, a distance of 0 to the third reference straight line 106 and the distance 109 to the first and second reference straight lines 104, 105 and to the intersection point 108 is required.A positioning unit 9 is thus proposed, which can find the charging connection 5 without a sensor arrangement on the vehicle side. In this case, an conceivable number of design variants for the reference geometry 13 are possible. In general, the more and the longer straight line sections 16, 17, 19, the more accurate the positioning will be. This is because possible measurement inaccuracies can be averaged by many measurement points.FIG. 6 shows the charging connection 5 and the charging contact 7 with the sensor device 10 in an axial plan view. In one configuration of the sensors 20 which can measure only one point, such as simple laser sensors, a reference travel is carried out in which the sensor device 10 moves over a receiving region 21 of the charging connection 5 along a scanning path 111 in order to detect at least two scanning points 22 per reference line 104, 105 or per reference contour 14 or reference magnet 15. In the exemplary embodiment shown, the charging contact 5 is moved together with the sensor device 10 alternately in the vehicle transverse direction 102 and in the vehicle longitudinal direction 101 over the receptacle region 21 in order to record at least two scanning points 22 for the two longitudinal straight line sections 16 and the transverse straight line section 17. This finds a sufficient number of sampling points 22 to be able to represent the reference geometry 13 according to FIG. 3 in the sensor image 18 and to be able to determine the reference straight lines 104, 105 on the basis thereof.List of reference characters1 Charging arrangement 2 Electric vehicle 3 Floor surface 4 Charging station 5 Charging connection 6 Energy store 7 Charging contact 8 Energy source 9 Positioning unit 10 Sensor device 11 Control device 12 Actuating device 13 Reference geometry 14 Reference contour 15 Reference magnet 16 Longitudinal straight line section 17 Transverse straight line section 18 Sensor image 19 Straight line section 20 Sensors 21 Recording region 22 Scanning points 100 Central axis 101 Vehicle longitudinal direction 102 Vehicle transverse direction 103 Reference coordinate system 104 First reference straight line 105 Second reference straight line 106 Third reference straight line 107 Center point 108 Intersection point 109 Distance 110 Angle 111 Scanning path

Claims

Charging arrangement (1), - with an electric vehicle (2) which has a charging connection (5) electrically connected to an energy store (6) of the electric vehicle (2), - with a charging station (4) for the automated charging of the energy store (6) which has a charging contact (7) contactable with the vehicle-side charging connection (5) and a positioning unit (9), wherein the positioning unit (9) is designed to determine a connection position of the charging connection (5) and to align the charging contact (7) on the basis of the connection position with the charging connection (5), wherein the charging connection (5) defines at least two reference straight lines (104, 105), which can be determined by the positioning unit (9) and via which a theoretical center point (107) of the charging connection (5) can be determined, wherein the charging connection (5) defines one of the reference straight lines (104, 105), 105), and the positioning unit (9) has a sensor device (10) detecting the reference geometry (13), wherein the reference geometry (13) is defined, with respect to a reference coordinate system (103), by two longitudinal straight line sections (16) extending in a y direction and at least one transverse straight line section (17) extending in an x direction, wherein a first reference straight line (104) is arranged centrally between the two longitudinal straight line sections (16) and a second reference straight line (105) lies on the transverse straight line section (17), wherein the theoretical center point (107) is arranged on the first reference straight line (104) at a distance (109) from an intersection point (108) of the first and second reference straight lines (104, 105), characterized in that the reference geometry (13) is formed by at least two optically detectable reference contours (14), the profiles are designed as profiles offset from the charging connection.Charging arrangement (1) according to Claim 1, characterized in that the theoretical centre point (107) is defined by an intersection point (108) of the at least two reference straight lines (104, 105).Charging arrangement (1) according to Claim 1, characterized in that the theoretical centre point (107) is defined, starting from an intersection point (108) of the at least two reference straight lines (104, 105), by a fixed distance (109) along one of the reference straight lines (104, 105).Loading arrangement (1) according to one of Claims 1 to 3, characterized in that the reference geometry (13) is defined, with respect to a reference coordinate system (103), by two straight line sections (19) arranged at an angle to one another in a y direction, wherein a first reference straight line (104) lies on the one straight line section (19) and a second reference straight line (105) lies on the other straight line section (19), wherein the theoretical centre point (107) is arranged on an intersection point (108) of the two reference straight lines (104, 105).Loading arrangement (1) according to one of Claims 1 to 3, characterized in that the reference geometry (13) is defined, with respect to a reference coordinate system (103), by two straight line sections (19) arranged at an angle to one another in a y direction and a longitudinal straight line section (16) extending centrally between the two straight line sections (19) in an x direction, wherein a first reference straight line (104) lies on the one straight line section (19), a second reference straight line (105) lies on the other straight line section (19) and a third reference straight line (106) lies on the longitudinal straight line section (16), wherein the theoretical centre point (107) is arranged on the third reference straight line (106) at a distance (109) from an intersection point (108) of the first and second reference straight lines (104, 105).Charging arrangement according to one of the preceding claims, characterized in that the reference geometry (13) has at least two magnetically detectable reference magnets (15).

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