Charging plug and charging station for a motor vehicle

Abstract

charging plug, - with a housing (4) for accommodating power contacts (6) and - with power contacts (6) for power transmission, whereby - a device (10) for liquid detection, which is designed to detect liquid accumulating within the housing (4), characterized in that - the device (10) for liquid detection has at least one detector element (12, 68) with a conductor track structure (14), - wherein the detector element (12, 68) is arranged in an interior space (16) of the housing (4), - wherein the conductor track structure (14) forms a detection surface (18) for liquid detection, - the detection surface (18) at least partially covers and / or spans a housing inner surface (20) facing the interior space (16), and - wherein the housing inner surface (20) has at least one bottom surface (22) facing the interior space (16) and / or at least one side surface (24, 26) facing the interior space (16).

Description

[0001] The invention relates to a charging connector with a housing for accommodating power contacts and with power contacts for power transmission. Furthermore, the invention relates to a charging station for motor vehicles with such a charging connector.

[0002] Charging plugs and charging stations of the type mentioned above are used, for example, to charge the battery of a vehicle with an electric motor.

[0003] The possible connectors between vehicles and charging stations are standardized and can therefore only be modified within the narrow limits specified by the standard. This is countered by the demand to continually increase charging power in order to shorten charging times. Therefore, increasingly higher charging powers are to be transmitted via the standardized connections. For example, charging currents of up to 350 amperes should be possible.

[0004] To enable high charging performance, a charging plug can be actively cooled to dissipate the heat generated in the connector area. This prevents damage to the charging plug or the vehicle due to overheating. Active cooling of a charging plug therefore generally enables a fast yet safe charging process.

[0005] However, there is a risk that cooling fluid will accumulate in the interior of the housing due to a leak in the cooling system and that the power contacts will be short-circuited by the escaping cooling fluid.

[0006] Regardless of the use of active cooling systems, there is a risk that liquid may penetrate the charging plug due to a damaged housing or improper use, causing a short circuit of the power contacts.

[0007] Such a short circuit poses a high risk of injury to the operator and can also lead to damage to the charging plug, the charging station and the vehicle being charged.

[0008] DE 10 2011 076 183 A1 describes an arrangement for protecting an electrical connection from interference, which comprises a first component that is at least temporarily exposed to interference factors and, in conjunction with a second component, enables an electrical connection. Furthermore, the arrangement comprises an interference detector configured to detect at least one interference factor for the first component.

[0009] DE 20 2016 104 369 U1 describes a connector with a leak sensor, wherein the connector has a connector housing with a cable outlet and a plug-in side, wherein the connector housing has a leak sensor on the cable outlet side and / or the plug-in side.

[0010] DE 100 26 968 A1 describes a testing device for water-protected connectors for control units, in particular for motor vehicles, with a first connector part designed as a socket and a second connector part designed as a socket plug, wherein the control unit-side connector part is operatively connected to the electronics of the control unit assigned to the connector via contact elements located on this control unit-side connector part. The control unit-side connector part is provided with additional moisture-sensitive sensor contacts that are operatively connected to its contact elements.

[0011] DE 10 2007 032 250 B3 describes a device for detecting liquid leaks, comprising a large-area, electrically non-conductive surface element on which conductor tracks are located. An electrical voltage is applied to these conductor tracks. By measuring the electrical resistance, the presence of a liquid drop on the surface element is detected.

[0012] DE 10 2016 105 311 A1 describes a connector part for connecting to a mating connector part, comprising at least one contact element for making electrical contact with an associated mating contact element of the mating connector part, and a contact holder on which the at least one contact element is held. The contact holder comprises a base body and an insulating jacket made of an electrically insulating material that at least partially encloses the base body, wherein the base body has at least one channel (358) through which a coolant can flow. This provides a connector part with a contact element that can have a high current-carrying capacity, for example, for use in a charging system for charging an electric vehicle.

[0013] JP S60-46457 A describes a humidity sensor produced by polymerizing methacrylamide propyltrimethylammonium chloride as a cation-conducting monomer and vinyl acetate, which is deposited between gold comb-shaped electrodes printed on the surface of an alumina substrate. The humidity sensor has a dew-preventing heater, consisting of an electric heater embedded in the back of the alumina substrate.

[0014] Based on the prior art described above, the invention is based on the technical problem of specifying a charging plug and a charging station which do not have the disadvantages described above or at least have them to a lesser extent and in particular enable a safe power transmission.

[0015] The technical problem described above is solved by a charging plug according to claim 1 and a charging station according to claim 11.

[0016] According to a first aspect, the invention relates to a charging plug with a housing for accommodating power contacts and with power contacts for power transmission. The charging plug has a liquid detection device configured to detect liquid accumulating within the housing.

[0017] The detector can detect whether liquid is present inside the housing. If liquid is detected, safety measures can be taken. For example, a charging process at a charging station can be aborted or the start of a charging process can be prevented.

[0018] The detector can be configured for connection to a control unit of a charging station in order, for example, to enable autonomous shutdown of the power supply of the charging plug in the event of detection of liquid in the housing.

[0019] The safety of a charging process can be improved by preventing a short circuit of power contacts caused by liquid and / or by indicating a possible short circuit.

[0020] When we talk about accumulating fluid, we can mean a single drop of fluid, a number of drops of fluid, or a larger amount of fluid.

[0021] The charging plug can be designed to transmit charging currents of up to 350 amperes to enable rapid charging of an electric vehicle battery.

[0022] The charging plug may have a handle provided on the housing to improve the handling of the charging plug.

[0023] The charging plug can be a charging plug according to the IEC 62196 standard to enable use for a wide range of electric vehicles.

[0024] The charging connector can be a DC charging connector for a so-called "Combined AC / DC Charging System" (CCS), which is a charging connector system for electric vehicles according to IEC 62196, with a vehicle's charging socket supporting both AC (alternating current) and DC (direct current) charging. The Combined AC / DC Charging System essentially consists of a vehicle-mounted CCS socket, the so-called inlet, and the charging connector. The vehicle-mounted CCS socket is therefore equally suitable for accommodating either an AC charging connector or a DC charging connector.

[0025] The charging plug can be a charging plug that is designed to charge a battery with direct current in order to enable rapid charging, for example at a publicly accessible rapid charging station.

[0026] The charging plug can be a charging plug that is designed to charge a battery with alternating current in order to enable gentle charging, for example at a charging station for private use.

[0027] The charging plug can be a charging plug that is designed to charge a battery with direct current and / or alternating current in order to enable flexible use of the charging plug.

[0028] According to the invention, the device for liquid detection has at least one detector element with a conductor track structure, wherein the detector element is arranged in an interior of the housing and wherein the conductor track structure forms a detection surface for liquid detection.

[0029] A liquid detector with a conductor track structure is generally known, with reference to DE 10 2007 032 250 B3 regarding the functioning of such a detector.

[0030] The present conductor track structure may have at least two conductor tracks that are spaced apart from each other and assigned to separate poles.

[0031] The distance between adjacent conductor tracks can be adjusted to adjust the detector's sensitivity to a detectable droplet size or liquid quantity. The smaller the distance between the conductor tracks, the smaller the droplet size or liquid quantity that bridges the conductor tracks and thus becomes detectable.

[0032] The conductor track structure forms a detection surface or spans a detection surface in the area of ​​which liquid can be detected.

[0033] At least one conductor track of the conductor track structure or the entire conductor track structure may have a corrosion-protective coating. For example, one conductor track of the conductor track structure or the entire conductor track structure may be gold-plated.

[0034] According to the invention, the detection surface at least partially covers and / or spans an inner housing surface facing the interior. Thus, in particular, free housing surfaces of the interior can be partially or completely covered by the detector.

[0035] According to the invention, the housing inner surface has at least one bottom surface facing the interior and / or at least one side surface facing the interior. A bottom surface can be completely or partially covered and / or spanned by the detector, in particular by a detection surface of the detector. Alternatively or additionally, a side surface can be completely or partially covered and / or spanned by the detector, in particular by a detection surface of the detector. "Covered" here means that the detector is arranged closely adjacent to the respective surface, in particular without a gap. "Spanning" in this case means that the detector completely or partially delimits the respective surface from an interior space accommodating the power contacts, but is at least partially extended at a distance or forming a gap from the respectively spanned surface.

[0036] A detector element can be held or fixed in the housing with a positive fit, a force fit, and / or a material fit. The detector element can be glued into the housing, for example, to achieve cost-effective, reliable fixation. The detector element can be loosely inserted into the housing. The detector element can be held in the housing by means of a snap-in or clamp connection.

[0037] The detector element can be a flat detector element whose width and length spanning the detection area are each a multiple of its wall thickness. The wall thickness is measured orthogonally to a detection area spanned by the conductor track structure. This allows the detector element to be compactly integrated into a housing. In particular, the detector element can be integrated into an existing housing or retrofitted without increasing the size or dimensions of the charging connector.

[0038] The detector element can be fully affixed to a side surface and / or a bottom surface of the housing with its rear side facing away from the interior. This allows for compact integration of the detector element into the interior of the housing.

[0039] According to a further embodiment of the charging plug, the detector element is adapted, at least in sections, to the shape of the housing. This allows for a compact integration of the detector element into the interior of the housing.

[0040] Alternatively or additionally, the flat detector element can be a flexible circuit board. This allows the detector element to be adapted to the shape of the housing non-destructively and without the use of tools.

[0041] According to a further embodiment of the charging plug, it is provided that a substrate supporting the conductor track structure and / or the detection surface and / or the conductor track structure have a curvature. For example, a substrate supporting the conductor track structure and / or the detection surface and / or the conductor track structure can be adapted to a curvature of the housing in order to achieve a compact integration of the detector element into the housing. Alternatively or additionally, a substrate supporting the conductor track structure and / or the detection surface and / or the conductor track structure can be bent or angled along an edge in order to follow a shape of the housing or to be arranged in a space-saving manner.

[0042] The planar detector element can have a central middle section, which in particular covers or spans a housing base at least in part. At least one lateral wing, in particular two lateral wings, can be connected to the central middle section, which extend at least in part at an angle to the central middle section. The lateral wings can each cover or span a side surface of the housing at least in part. The side surfaces associated with the wings can face each other.

[0043] A transition region formed between the central middle section and the lateral wings can be curved when viewed in cross-section, for example, describing a radius such that a seamless transition of the detector element from the central middle section to the lateral wings is formed. The transition can, in particular, be tangent-continuous or curvature-continuous when viewed in cross-section. The cross-section can be oriented orthogonally to a detection surface.

[0044] The detector element may be substantially U-shaped or horseshoe-shaped in a section orthogonal to the detection surface or may describe an open profile.

[0045] The detector element can enclose power contacts extending into the housing on at least two sides, in particular on three sides. For example, the power contacts can be arranged between two lateral wings of the detector element.

[0046] The detector element can be provided with a tab that extends into a connection area of ​​the housing, wherein the connection area has an opening for feeding one or more lines into the interior of the housing. This allows fluid accumulations in a narrow or tapered connection area to be detected. The tab is also provided with the conductor track structure, so that the detection surface extends into the connection area. Such a connection area and the tab can be tapered.

[0047] The tab may be extended at an angle to a central portion of the detector element to follow the shape of the housing.

[0048] The tab may, relative to a central middle portion of the detector element, be extended at least partially in a direction opposite to the extension of side tabs of the detector element in order to follow the shape of the housing.

[0049] At least one conductor track of the conductor track structure can have corrosion protection, in particular be gold-plated.

[0050] It can be provided that the detector element is essentially provided with at least two comb-like, grid-like or spiral-like nested conductor tracks which are spaced apart from one another.

[0051] It can be provided that the conductor track structure spans the entire planar extent of the detector element in order to ensure reliable detection of liquid in the housing.

[0052] The conductor structure can have two conductors that are coupled via a terminating resistor.

[0053] The detector element can have conductive surface portions or conductor tracks on an upper side facing the interior.

[0054] Alternatively or additionally, conductor tracks can be embedded in a substrate, such as an absorbent fleece or the like. The conductor tracks can be completely or partially surrounded by the substrate.

[0055] The detection surface can be arranged at least partially below the conductor track structure, viewed along a vertical direction, in order to reliably detect an accumulation of liquid. The orientation of the charging plug relates to the intended use of the charging plug, in particular when the charging plug is connected to a vehicle or held in a charging station.

[0056] According to a further embodiment, the charging plug has a heating device for warming the liquid detection device. Under unfavorable climatic conditions, condensation may form on the liquid detection device, which may trigger a false alarm. The heating device can prevent condensation on the liquid detection device and the associated false alarms.

[0057] The heating device can be controlled or switched on depending on ambient conditions such as temperature, humidity, air pressure, etc.

[0058] The heating device can have at least one conductor track arranged on a rear side of the detector element facing away from the detection surface. This allows the heating device to be integrated into the detector element in a compact and cost-effective manner.

[0059] The conductor track can be heated by a heating current.

[0060] Exactly one conductor track can be provided. Two or more conductor tracks can be provided.

[0061] To ensure full coverage or a full-surface heat input by the heating device, the heating device's conductor track can be arranged in a meandering pattern. Alternatively or additionally, the heating device's conductor track can span the entire surface area of ​​the back of the detector element.

[0062] The heating device may comprise one PTC element or several PTC elements.

[0063] The heating device may comprise a layer of PTC material.

[0064] The PTC element and the PTC material are characterized by an electrical resistance that increases with temperature, so that overheating of the heating device can be avoided without complex control.

[0065] Electrodes may be provided for heating the PTC element and / or the PTC material. The electrodes can be essentially point-shaped, linear, or grid-like.

[0066] The PTC element and / or the PTC material and / or the electrodes can be embedded at least partially, in particular completely, in the detector element.

[0067] According to a further embodiment of the charging plug, it is provided that the charging plug has a cooling device for actively cooling the charging plug, wherein the cooling device has at least one coolant circuit which carries a cooling fluid and wherein the cooling fluid is in particular water-based.

[0068] The combination of a cooling device with a fluid detection device enables particularly safe transmission of high charging power. For example, any coolant leakage in the housing can be monitored using the fluid detection device.

[0069] For example, if the interior of the housing is flooded with coolant due to a coolant leak from the cooling circuit, an emergency shutdown of a charging station connected to the charging plug can be initiated in conjunction with a control system. However, the liquid detection device can also detect, for example, the leakage of a single drop of coolant or the leakage of multiple individual drops of coolant.

[0070] The coolant may be water-based and contain an antifreeze agent such as glycol or the like.

[0071] The coolant can be a mineral oil.

[0072] The coolant can be a fully synthetic substance, such as fluorinated ketones or the like.

[0073] According to a second aspect, the invention relates to a charging station for a motor vehicle, comprising a charging plug according to the invention, wherein the device for liquid detection is designed to switch off or block a power output of the charging station in the event of detection of liquid in the housing.

[0074] It can be provided that the device for liquid detection is connected to a control unit of the charging station in order to trigger safety measures in the event of liquid accumulation, such as switching off the power output or the like.

[0075] A first pole of a first conductor track of a detector element can be connected to a PE conductor or a ground potential. A second pole of a second conductor track of the detector element can be supplied with a constant or intermittent voltage via a separate supply line from the control unit.

[0076] If a liquid wets the conductor tracks, an increased current flow can be detected by bridging the conductor tracks. A safety measure, particularly an emergency shutdown or similar, can be integrated into the control system for this case, so that, for example, the power output to the charging connector is interrupted. The increased current flow resulting from bridging the conductor tracks, or the reduction in ohmic resistance, can thus be converted into a signal that triggers safety mechanisms of the charging device, particularly a shutdown.

[0077] Alternatively or additionally, it can be provided that before power is delivered, i.e., before a charging process begins, a check is carried out to determine whether there is any liquid in the housing. In this case, the control unit can block power delivery in advance.

[0078] Overall, a charging station can be specified that enables a reliable and safe charging process, especially in combination with an actively cooled charging plug.

[0079] The invention is described in more detail below with reference to a drawing illustrating exemplary embodiments. The drawings schematically show: Fig. 1 a charging plug according to the invention; Fig. 2 the charging plug Fig. 1 without housing; Fig. 3 the charging plug Fig. 2 without supply lines; Fig. 4 the charging plug Fig. 3 without connecting couplings; Fig. 5 a device for liquid detection in a perspective view; Fig. 6 a charging station according to the invention; Fig. 7 shows another charging plug according to the invention; Fig. 8 shows another device for liquid detection in a perspective view.

[0080] Fig. Figure 1 shows a charging connector 2 in two perspective views. The charging connector 2 is intended for charging the battery of an electrically powered motor vehicle. The charging connector 2 is designed according to the IEC 62196 standard.

[0081] The charging plug 2 has a housing 4 for accommodating power contacts 6. The power contacts 6 are used to transmit power from a charging station 8 to a car. The charging plug 2 is designed for charging with direct current.

[0082] The charging plug 2 has a device 10 for liquid detection ( Fig. 2). Fig. 2 shows the supply and discharge lines encapsulated by the housing 4 as well as the corresponding connections, whereby a part of the housing has been hidden to illustrate the internal structures.

[0083] The device 10 is designed to detect liquid accumulating within the housing 4.

[0084] The device 10 for liquid detection has a detector element 12 with a conductor track structure 14.

[0085] The detector element 12 is arranged in an interior space 16 of the housing 14. The interior space 16 is separated from an environment U by the housing 4, as Fig. 1.

[0086] The conductor track structure 14 forms a detection surface 18 for liquid detection. The detection surface 18 is the entire area facing the interior space 16, which is spanned by the conductor track structure 14.

[0087] The detection surface 18 partially covers a housing inner surface 20 facing the interior 16, wherein the housing inner surface 20 is indicated by the dashed line of the Fig. 2. The housing inner surface 20 has a bottom surface 22 facing the interior 16 and two side surfaces 24, 26 facing the interior 16, wherein the side surfaces 24, 26 face each other. In this case, the detection element 12 rests with a rear side 28 facing away from the interior 16, fully abutting the side surfaces 24, 26 and the bottom surface 22 of the housing 4.

[0088] The detection element 12 is a flat detection element 12. A width b and a length l of the detection element 12 are each a multiple of the wall thickness t.

[0089] The detector element 12 is adapted to a shape of the housing 4.

[0090] The detector element 12 is a flexible circuit board 12.

[0091] A substrate 30 carrying the conductor track structure 14, the detection surface 18 and the conductor track structure 14 each have a curvature in the regions 32, 34.

[0092] The detector element 12 has a tab 36 that projects into a connection area 38 of the housing 4. The connection area 38 of the housing 4 has an opening 40 that serves to feed lines 42 into the interior 16 of the housing 4.

[0093] The lines 42 comprise a signal line 43, load lines 45, 49, 55, 57, a supply cooling hose 51 and two return cooling hoses 47, 53.

[0094] The conductor track structure 14 has corrosion protection and is gold-plated in this case.

[0095] The conductor track structure 14 has two conductor tracks 44, 46 spaced apart from one another.

[0096] The conductor tracks 44, 46 are arranged at a distance from one another and are interleaved in a comb-like manner in the region of the tab 36. In the region of a central middle section 48 of the detector element 12 and in the adjacent side tabs 50, 52 of the detector element 12, the conductor tracks 44, 46 are arranged in a spiral-like manner.

[0097] As in particular Fig. As can be seen from Figure 5, the conductor track structure 14 spans the entire planar extent of the detector element 12.

[0098] The Fig. 2, Fig. 3 and Fig. 4 show the orientation of the charging plug 2 during a charging process. As can be seen from the figures, the detector element 12 is arranged below the power contacts 6, viewed along a vertical axis V, in order to reliably detect liquid penetrating into the interior 16.

[0099] The conductor track 44 is connected to the connection element 54. The conductor track 46 is connected to the connection element 56. The connection elements 54, 56 are designed as sensor lines for supplying the detector element 12 and for communication with the detector element 12.

[0100] The charging connector has a cooling device 58 for actively cooling the charging connector 2. The cooling device 58 has a coolant circuit with two cooling channels 60, a coolant supply line 61, and two coolant returns 63, 65, which carry a cooling fluid. The cooling fluid is water-based in this case. Using the detector element 12, a leak of the cooling fluid encapsulated in the coolant circuit 60 into the interior space 16 can be detected.

[0101] Fig. Figure 6 shows a charging station for a motor vehicle according to the invention. The charging station 8 has a charging plug 2.

[0102] The liquid detection device 10 is configured to switch off or block a power output of the charging station 8 in the event of detection of liquid in the housing 4.

[0103] Fig. 7 shows a further variant of a charging plug 62 according to the invention, which is also provided with a charging station 8 ( Fig. 6). To avoid repetition, only the differences between the charging plug 62 and the charging plug 2 will be discussed below, whereby in the Fig. 7 and Fig. 8 compared to the Fig. 1 to 7 the same reference symbols are assigned the same features.

[0104] In comparison to the charging plug 2, the charging plug 62 has a heating device 64 for heating the device 10 for liquid detection.

[0105] The heating device 64 has at least one conductor track 66, which is arranged on a rear side 28 of a detector element 68 facing away from the detection surface 18. The conductor track 66 runs in a meandering manner and spans the entire planar extent of the rear side 28 of the detector element 68. The conductor track 66 is therefore an integral component of the detector element 68. The conductor track 66 can be heated by means of a heating current. To improve clarity, the detection element 68 is in Fig. 8 shown separately. Reference symbol 2 charging plugs 4 housings 6 power contacts 8 charging station 10 Liquid detection device 12 detector element 14 Conductor track structure 16 Interior 18 detection area 20 Housing interior surface 22 floor area 24 side surface 26 side surface 28 Back 30 Substrat 32 Area / Curvature 34 Area / Curvature 36 tab 38 Connection area 40 Opening 42 lines 43 Signal line 44 conductor track 45 Load line 46 conductor track 47 Cooling hose return 48 central middle section 49 Load line 50 side flaps 51 Cooling hose supply 52 side flap 53 Cooling hose return 54 connection 55 load line 56 connection 57 Load line 58 Cooling device 60 cooling channel 61 Coolant supply 62 charging plugs 63 Coolant return 64 Heating device 65 Coolant return 66 conductor track 68 detector element

Claims

[1] Charging plug, - with a housing (4) for accommodating power contacts (6) and - with power contacts (6) for power transmission, whereby - a liquid detection device (10) designed to detect liquid accumulating within the housing (4), characterized by , that - the device (10) for liquid detection has at least one detector element (12, 68) with a conductor track structure (14), - wherein the detector element (12, 68) is arranged in an interior space (16) of the housing (4), - wherein the conductor track structure (14) forms a detection surface (18) for liquid detection, - the detection surface (18) at least partially covers and / or spans a housing inner surface (20) facing the interior space (16), and - wherein the housing inner surface (20) has at least one bottom surface (22) facing the interior space (16) and / or at least one side surface (24, 26) facing the interior space (16). [2] Charging plug according to claim 1, characterized by , that - the detector element (12, 68) is a flat detector element (12, 68) whose width (b) and length (l) spanning the detection surface (18) are each a multiple of its wall thickness (t) and / or - the detector element, with a rear side (28) facing away from the interior, rests over its entire surface against a side surface (24, 26) and / or a bottom surface (22) of the housing (4). [3] Charging plug according to one of claims 1 or 2, characterized by , that - the detector element (12, 68) is adapted at least in sections to a shape of the housing (4) and / or - the detector element (12, 68) is a flexible printed circuit board (12). [4] Charging plug according to claim 3, characterized by , that - a substrate (30) carrying the conductor track structure (14) and / or the detection surface (18) and / or the conductor track structure (14) have a curvature. [5] Charging plug according to one of the preceding claims, characterized by , that - the detector element (12, 68) has a tab (36) which projects into a connection area (38) of the housing (4), - wherein the connection area (38) has an opening (40) for feeding one line (42) or several lines (42) into the interior (16) of the housing (4). [6] Charging plug according to one of the preceding claims, characterized by , that - at least one conductor track (50, 52) of the conductor track structure (14) has a corrosion protection, in particular is gold-plated, and / or - the detector element (12, 68) is essentially provided with at least two comb-like, grid-like or spiral-like interleaved conductor tracks (50, 52) which are spaced apart from one another and / or - the conductor track structure (14) spans the entire planar extent of the detector element (12, 68) and / or - the detection surface (18) is arranged below the line contacts (6) when viewed along a vertical direction. [7] Charging plug according to one of the preceding claims, characterized by - a heating device (64) for heating the liquid detection device (10). [8] Charging plug according to one of the preceding claims characterized by , that - the heating device (64) has at least one conductor track (66) which is arranged on a rear side (28) of the detector element (68) facing away from the detection surface (18). [9] Charging plug according to claim 8, characterized by , that - the conductor track (66) of the heating device (64) runs in a meandering manner and / or - the conductor track (66) of the heating device (64) spans the entire planar extent of the rear side (28) of the detector element (68). [10] Charging plug according to one of the preceding claims, characterized by - a cooling device (58) for actively cooling the charging plug (2), - wherein the cooling device (58) has at least one coolant circuit (60) which carries a cooling fluid and - the cooling fluid is in particular water-based. [11] Charging station for a motor vehicle, - with a charging plug (2, 62) according to one of the preceding claims, - wherein the device (10) for liquid detection is designed to switch off or block a power output of the charging station (8) in the event of detection of liquid in the housing (4).

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