DE102020102219A1 - Charging connector for a charging cable for connection to a motor vehicle and motor vehicle and charging system - Google Patents

Abstract

The invention relates to a charging plug (12) for a charging cable (11) for connection to a motor vehicle (motor vehicle), the charging plug (12) having a mechanical plug-in interface (S) for plugging into a charging socket (54) of the motor vehicle (motor vehicle) and Several DC plug contacts (13) are provided at the plug interface (S) for plugging into a DC beech field (56) of the charging socket (54) and for transmitting a DC charging current (14) and in a housing (25) of the charging plug ( 12) a converter circuit (18) for setting a current strength of the DC charging current (14) is integrated. The invention provides that at least one circuit component (26) of the converter circuit (18) each via at least one heat conduction path (34, 35) with at least one of the DC plug contacts (13) and / or with at least one connection field (17) for a respective Wire (33) of the charging cable (11) is thermally coupled, the respective heat conduction path (34, 35) being set up for heat transport of waste heat (32) to the at least one DC plug contact (13) and / or the connection panel (17) is.

Description

The invention relates to a charging plug as it can be attached to the end of a charging cable in order to be able to connect the charging cable to a motor vehicle. For this purpose, the charging plug can have a mechanical plug-in interface for plugging into a charging socket of the motor vehicle. A converter circuit is integrated in the charging plug in order to convert an alternating current (AC) into a direct current (DC - direct current) for charging an energy storage device of the motor vehicle. This direct current is therefore also referred to here as the DC charging current. The invention also includes a motor vehicle with the described charging socket and a charging system that provides said motor vehicle and a charging cable with the charging plug.

In order to recharge the electrical energy store of an electric vehicle with energy, the electric vehicle can have a charging socket into which the charging plug of a charging cable can be inserted in order to transfer energy from a power grid into the motor vehicle. Since an electricity network usually provides an alternating current (AC), a conversion into a direct current (DC) is necessary so that this direct current is available for charging the energy storage device, for example an electric accumulator or an electric battery. The converter circuit necessary for converting the alternating current into direct current can be integrated into the charging plug of the charging cable, which has the advantage that no such converter circuit has to be retrofitted in a residential building if an electric vehicle is to be recharged there. Instead, a charging cable with such a charging plug can be carried in the electric vehicle.

Due to the compact design in the charging plug and the desire for the highest possible charging power, however, the dissipation of heat from the converter circuit into the environment can prove to be a challenge. For example, it may be necessary for a housing of the charging plug to be designed to be dust-tight and splash-proof. If the heat is then dissipated from such a housing by means of a heat sink, this heat sink must be arranged so that it is protected from contact due to its heat, since the charging plug has to be gripped by a user in order to be able to insert it into the charging socket and remove it from it again .

A charging cable with a charging plug is, for example, from the DE 10 2014 111 334 A1 famous. It is described therein that temperature monitoring can also be provided for the electrical plug contacts, via which the charging current flows from the charging plug into the charging socket of the motor vehicle.

Such temperature monitoring of the plug contacts in a charging plug is also from the WO 2016/020133 A1 famous. These plug contacts can heat up if an electrical charging current flows into the charging socket via the plug contacts. However, the temperature development can be controlled by means of temperature monitoring.

From the DE 10 2016 211 876 A1 it is known that the plug contacts of a charging plug can be passed through a circuit board in order to measure the temperature at the plug contacts.

The invention is based on the object of guiding the waste heat that is generated in a housing of a charging plug by a converter circuit operated there out of the housing.

The object is achieved by the subjects of the independent claims. Advantageous embodiments of the invention are described by the dependent claims, the following description and the figures.

The invention provides a charging plug that can be mounted on a charging cable in order to be able to connect it to a motor vehicle. The charging plug has a mechanical plug-in interface for plugging into a charging socket of the said motor vehicle. Such a plug interface can have an area or a field with several DC plug contacts for plugging into a corresponding DC socket field of the charging socket. A socket field is an area in which the respective electrical contacts are arranged together.

For additional mechanical guidance, a plug-in interface can also have a collar, which can also function as a protection against accidental contact. The DC plug contacts are intended to transmit a DC charging current. To generate this DC charging current, a converter circuit is integrated into a housing of the charging plug, by means of which a current intensity of the DC charging current can also be set or controlled. An example of a suitable converter circuit is a power converter or rectifier or an AC / DC converter. The DC charging current generated by the converter circuit can be routed to the DC plug-in contacts in a manner known per se in the housing via wires and / or busbars or metal pins.

In order to enable cooling or heat dissipation at the converter circuit, is At least one circuit component of the converter circuit is additionally thermally coupled via at least one heat conduction path (to the plug interface) to at least one of the DC plug contacts and / or (to the charging cable) to at least one connection field for a respective wire of the charging cable. Waste heat from the at least one circuit component can thus diffuse or be conducted via the respective heat conduction path to at least one of the DC plug contacts and / or into at least one wire of the charging cable. In addition to the electrical connections of the converter circuit to the DC plug contacts on the one hand and to the wires of the charging cable on the other hand, heat conduction via a heat conduction path is also provided in at least one direction (i.e. towards at least one DC plug contact and / or towards the charging cable). This heat conduction path has in particular at least one thermally conductive solid body, the thermal conductivity of which is greater than 200 W / (mk). The heat conduction path is preferably formed on the basis of metal, in particular aluminum and / or copper. The heat conduction path is set up for the heat transport of waste heat from the converter circuit to the at least one DC plug contact and / or to the connection field for wires of the charging cable. The respective heat conduction path is different from the current-carrying components of the charging plug.

The invention has the advantage that waste heat generated in the converter circuit can be dissipated specifically via the heat conduction path into at least one, preferably all DC plug contacts and / or into at least one wire, preferably several wires, of the charging cable, from where the waste heat can then spread into the motor vehicle and / or into the charging cable. This distributes the waste heat. This takes place by means of the at least one heat conduction path, so it does not require the thermal conductivity of the current-carrying components themselves.

The invention also encompasses embodiments which result in additional advantages.

Said connection field can, for example, have metallic connection surfaces with screw holes in order to be able to screw cable lugs of the charging cable to the connection field, and / or it can have soldering surfaces (so-called soldering pads) for soldering the wires of the charging cable.

In one embodiment, the thermal conductivity is provided in the heat conduction path by means of at least one heat-conducting metallic component. In other words, at least a section or a section of the heat conduction path is formed by a metallic component, such as, for example, a screw bolt or a rod or a plate. The term “component” here means an element of the charging plug that preferably also fulfills a further function, for example a holding function or a mechanical power transmission. A metal plate can, for example, support and / or connect the converter circuit and a frame for the DC plug-in contacts. In addition or as an alternative to this, the heat conduction path for the thermal conductivity can also have a dedicated metal plate, which is provided without a further mechanical function, that is to say in addition, in order to form the heat conduction path or at least a section of the heat conduction path. Additionally or alternatively, the heat conduction path can comprise, at least in sections or completely, a copper inlay or generally a metal inlay of a printed circuit board. Such a metal inlay is a metal body inserted into the circuit board, e.g. a metal block, or a metal layer of the circuit board, which preferably has a thickness of more than 0.5 millimeters, in particular more than 1 millimeter. It can be an intermediate layer or a bottom layer of the circuit board. In this way, the waste heat on the circuit board itself can pass into the heat conduction path from the electrical connection pins of an electronic component of the converter circuit. Additionally or alternatively, the heat conduction path comprises a heat pipe and / or a liquid cooling system and / or a Peltier element. This has the advantage that active cooling or active heat transport can be implemented.

In one embodiment, the respective heat conduction path is formed through a circuit board by means of what is known as a VIA (vertical interconnect access; through-hole plating). For this purpose, a through opening in the printed circuit board can be filled with a metallic filler material, for example solder or a metal pin. By guiding the waste heat through a circuit board by means of VIAs, there is the advantage that the waste heat can be conducted from one side of the circuit board to the other side of the circuit board. In particular, no power transmission or power line is provided by means of the VIAs.

In one embodiment, as a respective circuit component of the converter circuit, at least one of the following is thermally connected to the at least one heat conduction path: an AC-DC stage, a DC-DC stage, an output filter. These circuit components have proven to be particular sources of heat. The connection to the heat conduction path can take place, for example, by means of a heat conduction paste and / or a copper foil.

In the event that a heat conduction path is to lead to the charging cable, one embodiment provides that the at least one connection field, to which wires of the charging cable must be connected, by means of a metal inlay Printed circuit board of the said type is realized. The wires of the charging cable can be soldered to this circuit board, for example, or provision can be made for the wires to be screwed to the circuit board by means of cable lugs. In the manner described, a metal inlay is an additional metal body or an additional metal layer of the circuit board, via which waste heat can be transported or guided. The term “additional” means that this metal inlay is not used to conduct electricity or to conduct electricity.

In one embodiment, a threaded bolt for screwing the metal inlay circuit board is integrated into the metal inlay circuit board. In this case, this threaded bolt is preferably galvanically coupled to the metal inlay, that is to say the described metal layer or the integrated metal body. Thus, a heat transfer between the threaded bolt and the metal inlay can be promoted. This promotes the heat distribution of the waste heat.

In one embodiment, the respective heat conduction path is galvanically separated from the at least one circuit component of the converter circuit and / or the at least one DC plug contact and / or the at least one connection field by means of an electrical insulating layer. In other words, the heat conduction path is not used to conduct electricity. This has the advantage that the heat conduction path itself is not subjected to the charging voltage and thus no contact protection measures are necessary to the extent that is necessary for the current-carrying current path. This simplifies the design for the dissipation of heat away from the heat conduction path.

In connection with the described motor vehicle, in whose charging socket the waste heat from the charging plug is dissipated, the invention provides that within the motor vehicle a cooling option is provided for the socket contacts of the charging socket, which are now additionally subjected to waste heat. For this purpose, the invention provides a motor vehicle which has said electrical energy store which is coupled to a charging socket for plugging in an embodiment of the charging plug according to the invention. For this purpose, the charging socket has corresponding DC socket contacts for receiving the DC charging current. The motor vehicle receives the DC charging current for recharging the energy storage device via the DC socket contacts in the charging socket. The DC socket contacts are electrically connected to the energy store in a manner known per se through an electrical connection path to the energy store. Such a connection path can be implemented, for example, by a cable and / or a busbar. In the motor vehicle according to the invention, at least one heat sink is provided on the connection path, the at least one heat sink being thermally connected to at least one of the DC socket contacts via the electrical connection path. So if the charging plug conducts additional waste heat via the DC plug contact into a DC socket contact via its heat conduction path, this waste heat can spread in the electrical connection path, which, due to its electrically conductive material, for example copper or aluminum or a metal in general, favors the spread of heat, can then be led to the heat sink, where it can then be discharged from the connection path. A heat sink can be made of aluminum, for example, and have the rib structure or fan structure known for a heat sink. Additionally or alternatively, the heat sink can be realized by a sheet metal of the motor vehicle.

The motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger vehicle or truck, or as a passenger bus or motorcycle.

The invention also comprises a charging system which comprises a combination of an embodiment of the motor vehicle according to the invention and a charging cable with an embodiment of the charging plug according to the invention.

Finally, the invention also includes a charging device that results from the combination of a charging cable and a charging plug which is connected to one end of the charging cable. In the case of the charging device, waste heat can therefore be dissipated from the converter circuit of the charging plug via at least one heat conduction path.

The described embodiments of the invention can also be implemented in one and the same product, as long as they are not expressly mutually exclusive embodiments.

• 1 eine schematische Darstellung eines Ladesteckers einer Ladevorrichtung gemäß der Erfindung;
• 2 einen schematisierten Schaltplan einer Wandlerschaltung, wie sie in dem Ladestecker von 1 bereitgestellt sein kann;
• 3 eine weitere schematisierte Darstellung der Wandlerschaltung mit einer Veranschaulichung von Wärmequellen;
• 4 eine schematische Explosionsdarstellung des Ladesteckers von 1;
• 5 eine schematische Darstellung eines Längsschnitts des Ladesteckers mit einer Veranschaulichung von Wärmeleitpfaden;
• 6 eine schematische Darstellung, die eine Leiterplatte und DC-Steckkontakte zeigt, die über einen ersten Wärmeleitpfad miteinander thermisch gekoppelt sind;
• 7 eine schematische Darstellung eines Längsschnitts des Ladesteckers mit einer Darstellung des ersten Wärmeleitpfads von 6;
• 8 eine schematische Darstellung eines Anschlussfelds für Drähte eines Ladekabels der Ladevorrichtung; und
• 9 eine schematische Darstellung eines Ladesystems mit der Ladevorrichtung und einem Kraftfahrzeug.

Exemplary embodiments of the invention are described below. This shows:

• 1 a schematic representation of a charging plug of a charging device according to the invention;
• 2 a schematic circuit diagram of a converter circuit as it is in the charging plug of 1 can be provided;
• 3 a further schematic representation of the converter circuit with an illustration of heat sources;
• 4th a schematic exploded view of the charging plug of 1 ;
• 5 a schematic representation of a longitudinal section of the charging plug with an illustration of heat conduction paths;
• 6th a schematic illustration showing a circuit board and DC plug contacts that are thermally coupled to one another via a first heat conduction path;
• 7th a schematic representation of a longitudinal section of the charging plug with a representation of the first heat conduction path from 6th ;
• 8th a schematic representation of a connection field for wires of a charging cable of the charging device; and
• 9 a schematic representation of a charging system with the charging device and a motor vehicle.

The exemplary embodiments explained below are preferred embodiments of the invention. In the exemplary embodiments, the described components of the embodiments each represent individual features of the invention which are to be considered independently of one another and which also further develop the invention in each case independently of one another. Therefore, the disclosure is intended to include combinations of the features of the embodiments other than those shown. Furthermore, the described embodiments can also be supplemented by further features of the invention that have already been described.

In the figures, the same reference symbols denote functionally identical elements.

1 shows a charging device 10, which has a charging cable 11 may have that with a charging plug 12th the charging device 10 can be connected. The charging plug 12th can be plugged into a (not shown) charging socket of a motor vehicle, so that via the charging cable 11 electrical energy from an electrical supply network (not shown), for example an alternating current network with an alternating voltage in the range from 100 volts to 250 volts, can be transmitted into the motor vehicle in order to recharge an electrical energy store of the motor vehicle with electrical energy there. The motor vehicle can be an electric vehicle or a hybrid vehicle, for example.

For inserting the charging plug 12th A plug-in interface S can be provided in the charging socket, which can provide a mechanical guide known per se for plugging in and in addition to DC plug-in contacts 13th further plug contacts 13th for the transmission of communication signals and / or a ground potential.

The charging plug 12th the DC plug contacts 13th have, each of which can be plugged into a DC socket contact in a (not shown) DC socket field of the charging socket of the motor vehicle. 1 shows here an example of a so-called type of charging plug 2 as is known per se from the prior art. Via the DC plug contacts 13th can be a DC charging current 14th be transferred to the motor vehicle or exchanged with the motor vehicle. Via the charging cable 11 can be an AC alternating current 15th in the charging plug 12th be transmitted.

2 shows how inside the charging connector 12th an electrical conversion of the AC alternating current 15th from the charging cable 11 into the DC charging current 14th can be carried out. 2 shows the charging plug again at the top 12th in a perspective view to the spatial orientation for the schematic circuit diagram shown below 16 admit.

The charging cable 11 can in the charging plug 12th to a connection panel 17th be attached for example by soldering and / or by means of cable lugs. The one on such a connector panel 17th Electrical contacts PE, L1, N provided are named in the manner known from the prior art.

In 2 the plug-in interface S is also shown with the designations for the plug-in contacts PP, CP, PE, DC +, DC- possible there in the manner known per se.

For converting the AC alternating current 15th into the DC charging current 14th can be a converter circuit 18th be provided, which can be designed here as an AC / DC converter circuit. With this a DC charging voltage 19th which can be a high-voltage voltage, that is to say a voltage value greater than 60 volts, in particular greater than 100 volts. The DC charging voltage 19th can adjust the DC charging current 14th drive or cause.

A control circuit 20th can the converter circuit 18th by means of control signals 21 control, which can be, for example, PWM signals (PWM - pulse width modulation). Voltage measuring circuits can be used for regulation 22nd and / or current measurement circuits 23 be provided to a current strength of the DC charging current 14th to be regulated to a setpoint. The control circuit 20th can have a microcontroller µC for this purpose. A communication module 24 be provided that, for example, can implement the communication based on a PLC (Powerline Communication) in a manner known per se.

When operating the converter circuit 18th This can result in waste heat or heat loss from a housing 25th of the charging plug 12th must be dissipated so that the converter circuit 18th by means of the charging plug 12th can convert or provide transferred electrical power.

3 illustrates once again the relevant heat sources of the converter circuit 18th . The charging cable is shown 11 , which is the AC alternating current 15th provides, and the plug interface S, which can be plugged into the motor vehicle motor vehicle. The charging cable 11 and the plug contacts of the plug interface S are via the converter circuit 18th electrically coupled to each other. This can be achieved by means of several circuit components or circuit parts 26th the converter circuit 18th be realized. Possible circuit components 26th are one or more of the following: an input filter 27 , a bidirectional AC-DC stage 28 , a DC link 29 , a DC-DC stage 30th , which is preferably designed to be operated bidirectionally, and an output filter 31 . These switching components 26th are known per se from the prior art. It has been shown that the AC-DC stage in particular 28 and the DC-DC stage 30th and / or the output filter 31 heat loss or waste heat to be dissipated 32 respectively.

4th illustrates once again in a schematic exploded view how this heat transport in the charging plug 12th is realized. The DC plug contacts are used as cooling elements 13th and / or at least one wire 33 .

5 illustrates how this is done by at least one circuit component or one circuit component 26th the converter circuit 18th the waste heat 32 via a first heat conduction path 34 into the DC plug contacts 13th and / or via a second heat conduction path 35 in at least one cable or one wire 33 of the charging cable 11 can be directed. The thermal conduction paths 34 , 35 are galvanic from the electrical paths as they are through the converter circuit 18th themselves are provided to the charging cable 11 with the DC plug contacts 13th to connect, disconnected.

6th illustrates this for the first heat conduction path 34 a possible implementation. It shows how a circuit component 26th the converter circuit 18th on a circuit board 36 the converter circuit 18th can be mounted and by means of the heat conduction path 34 the waste heat from the circuit component 26th into a material of a DC plug contact 13th , for example a metal, can be transferred. The thermal conduction path 34 can do this with a heat sink or a plate 37 include, which can be formed for example from a metal, for example aluminum or copper. About the waste heat from the circuit component 26th into the plate 37 through the circuit board 36 to transmit through, for example in the circuit board 36 a copper inlay 38 be integrated, through which the waste heat inside the circuit board 36 can be performed. Additionally or alternatively, Thermo-VIAs 39 can be realized or provided, that is, through holes filled with a metal or a metal alloy in the printed circuit board 36 . For example, the waste heat can come from a hot area 40 along a propagation path 41 along the thermal path 34 into the DC plug contact 13th be directed. The DC plug contact 13th can be in contact with electrical cables of the motor vehicle when plugged into the charging socket, so that the waste heat can be distributed in these cables.

6th illustrates a thermal equivalent circuit diagram on the right, which shows how based on a thermal resistance 42 of the circuit component 26th even the waste heat through a thermal resistor 43 the thermal connection between the circuit component 26th and the circuit board 36 and thermal resistance 44 electrical insulation of the circuit board 36 itself, for example a synthetic resin and a thermal resistor 45 a metallic area, for example the copper of the copper inlay and / or the material of the VIAs 39 and a thermal resistance 46 the thermal connection between the circuit board 36 and the heat sink of the plate 37 and thermal resistance 47 of the plate's heat sink 37 even have to overcome to get into the DC plug contact 13th to get. This corresponds to the thermal resistance of the propagation path 41 .

7th illustrates how the arrangement is made 6th in the charging plug 12th can be arranged. To get to the converter circuit 18th Wires 33 of the charging cable 11 to be connected (in 7th not shown), a connector panel 17th be provided as in 8th is shown in an exemplary embodiment. The connector panel 17th can for example be based on a printed circuit board 48 be realized via connections or plug contacts 49 with the circuit board 36 can be connected. The circuit board 48 can the connector panel 17th through electrically conductive connection surfaces 50 realize, which can be realized, for example, as copper surfaces. It can be a threaded bolt 51 be provided, for example, to connect the grounding cable PE and / or the circuit board 48 mechanically with the housing 25th connect to.

In the connection surfaces 50 can through holes 52 be provided, for example, a cable lug of the respective wire 33 with the circuit board 48 to screw. Via the plug contacts 49 and the pads 50 can so the waste heat in the wires 33 be led away or led away. This results in the described second heat conduction path 35 .

9 illustrates how from the combination of the motor vehicle and the charging plug 12th a charging system 53 is realized. In the charging system 53 is it enables the charging plug 12th into the described charging socket 54 of the motor vehicle KFZ can be plugged in and thus via the DC plug contacts 13th those from the thermal path 34 into the DC plug contacts 13th excess heat in at least one electrical conducting element 55 of the motor vehicle KFZ can be directed. Thus, the waste heat can be in the area of a DC socket field 56 from the charging plug 12th be transferred into the motor vehicle KFZ. As a guiding element 55 a cable can be provided. Through the guide element 55 can generally be an electrical connection path 57 be realized to the DC charging current 14th to an electrical energy store 58 of the motor vehicle KFZ, for example an electric high-voltage battery. At this connection path 57 , for example on the guide element 55 , can be a heat sink 59 or it can have multiple heat sinks 59 be arranged to be in the connection path 57 from the DC plug contacts 13th received waste heat 32 again from the electrical connection path 57 dissipate and deliver in an environment inside the motor vehicle KFZ. The heat sink 59 can be galvanically separated from the electrical connection path 57 be arranged, which can be implemented, for example, by an electrical insulation layer. The heat sink 59 can, for example, cooling fins in a manner known per se 60 exhibit.

The DC plug contact 13th can for example in a DC socket contact 13 ' the charging socket 54 be inserted, as is known per se from the prior art.

The heat sink 59 can with the guide element 55 be thermally connected, creating a via the connection path 57 indirect thermal coupling with the DC socket contacts 13 ' results. The heat sink 59 can additionally or alternatively also directly on the at least one DC socket contact 13 ' be connected, the galvanic isolation described can also be provided here again.

Particularly preferred embodiments are described again below.

The described implementation of the integration of the charging power electronics can, as in the 2 illustrated, implemented. The power electronics / charging electronics integrated in the connector are directly fed by the infrastructure-side AC voltage ( L1 , L2 , L3 , N and PE). Depending on the expansion stage, the plug-in power supply unit (charging plug with integrated converter circuit) can also only be single-phase (L1, N and PE). The integrated µC of the control circuit can take over the communication to the vehicle and monitors, controls and regulates the power electronics. In addition, fuse elements are integrated at the input and output to protect the power supply unit or the vehicle from overcurrent. With a maximum charging power of <= 3500W and an average efficiency of 96%, a total power loss of 175W occurs. These are divided equally between the power electronics on the AC grid infrastructure side and the DC high-voltage side. A thermal coupling between AC and DC side is not possible due to galvanic separation.

Future charging systems require the integration of power electronics in the connector or in the connector housing. E.g. a DC / DC converter and / or an AC / DC converter can be integrated in a so-called combo connector. However, this integration of the charging power electronics in the charging plug requires cooling or cooling of the electronics. Since the housing has to be designed to be waterproof and dustproof due to the handling requirements, the heat dissipation is a major challenge. Active cooling with, for example, liquid coolant cannot be implemented for a portable, portable charging cable with integrated charging power electronics. On average, when integrating charging power electronics with a charging power of 3.5kW with an efficiency of 95%, 175W power loss occurs. It is precisely the galvanically separated energy conversion from the network-side infrastructure and the output-side DC charging voltage that generates power loss during operation, which must be dissipated in the form of waste heat.

In order to divert the power loss that arises from the charging power electronics out of the waterproof and dust-proof housing, the following idea is based on dissipating the heat loss resulting from the energy conversion through the connector pins (i.e. the DC connector contacts) and the connection cable . The DC plug contacts are designed, for example, as so-called crimp contacts and are not connected to a circuit board (PCB). Cooling via crimp contacts and cables can be technically implemented using the idea. The DC line pins (DC plug contacts) are thermally connected to the integrated power electronics via a thick copper circuit board (metal inlay) and can thus dissipate the waste heat into a cable harness via the DC power pins. Idem the motor vehicle and the intended charging interface for much higher charging power (e.g. more than 100kW) or charging currents (e.g. 350Adc) is designed, the thermal mass of the connection line in the vehicle and the supply line can be used for cooling the integrated power electronics. The basis for this is created by the additional thermal connection to the circuit board of the integrated power electronics.

• - Es ermöglicht eine Integration von Leistungselektronik in den Combo Stecker.
• - Es ermöglicht eine Kühlung/ Entwärmung der Leistungselektronik im Stecker ohne zusätzlichen Aufwand.
• - Aktive Abfuhr der Verlustwäre des Steckers

This results in the following advantages in particular:

• - It enables the integration of power electronics in the combo connector.
• - It enables the power electronics in the connector to be cooled / cooled without additional effort.
• - Active dissipation of the loss of the connector

The cooling of the AC input side as well as the DC output side takes place via so-called circuit boards with thick copper inlay. The thermal advantages of the circuit boards make it possible to achieve the best possible heat flow between the power loss source (the power semiconductors) and the heat sink (the cables). The power loss of the power semiconductors is dissipated by a copper Inley circuit board and can thus be directed towards the DC plug contacts of the charging connector. Another idea is the connection of the DC plug contacts and the AC supply line to the thick copper circuit board in order to achieve a heat flow.

The infrastructure-side cooling takes place via a direct thermal connection of the supply line to a thick copper circuit board.

Overall, the examples show how the invention can provide a device for cooling a charging plug with integrated power electronics for electric vehicles.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102014111334 A1 [0004]
• WO 2016/020133 A1 [0005]
• DE 102016211876 A1 [0006]

Claims (10)

Charging plug (12) for a charging cable (11) for connection to a motor vehicle (motor vehicle), the charging plug (12) having a mechanical plug-in interface (S) for plugging into a charging socket (54) of the motor vehicle (motor vehicle) and being connected to the plug-in interface ( S) several DC plug contacts (13) are provided for plugging into a DC beech field (56) of the charging socket (54) and for transmitting a DC charging current (14) and a converter circuit is provided in a housing (25) of the charging plug (12) (18) is integrated for setting a current strength of the DC charging current (14), characterized in that at least one circuit component (26) of the converter circuit (18) is connected to at least one of the DC plug contacts ( 13) and / or is thermally coupled to at least one connection field (17) for a respective wire (33) of the charging cable (11), the respective heat conduction path (34, 35) for heat transport of waste heat (32) to the at least one DC plug contact t (13) and / or the connection panel (17) is set up. Charging plug (12) Claim 1 , wherein in the respective heat conduction path (34, 35) the thermal coupling by means of at least one thermally conductive metallic component and / or a metal plate (37) and / or a copper inlay (38) of a circuit board (36) and / or by means of a heat Pipe and / or is provided by means of liquid cooling and / or a Peltier element. Charging plug (12) according to one of the preceding claims, wherein the respective heat conduction path (34, 35) is guided through a circuit board (36) by means of a VIA (39). Charging plug (12) according to one of the preceding claims, wherein at least one of the following is thermally connected to the at least one heat conduction path (34, 35) as the respective circuit component (26): an AC-DC stage (28), a DC-DC stage (30), an output filter (31). Charging plug (12) according to one of the preceding claims, wherein the at least one connection field (17) is implemented by means of a copper inlay circuit board (48). Charging plug (12) Claim 5 , wherein a threaded bolt (51) for screwing the copper inlay circuit board (48) is integrated into the copper inlay circuit board (48) and the threaded bolt (51) with the copper inlay of the copper inlay circuit board (48) is galvanically coupled. Charging plug (12) according to one of the preceding claims, wherein the respective heat conduction path (34, 35) by means of an electrical insulating layer of the at least one circuit component (26) of the converter circuit (18) and / or the at least one DC plug contact (13) and / or the at least one connection field (17) is galvanically isolated. Charging device (10) with a charging cable (11) and a charging plug (12) according to one of the preceding claims arranged at one end of the charging cable (11). Motor vehicle (motor vehicle) with an electrical energy store (58) which is coupled to a charging socket (54) for plugging in a charging plug (12) according to one of the preceding claims, wherein in the charging socket (54) DC socket contacts (13 ') for receiving a DC charging current (14) are provided for recharging the energy store (58), characterized in that at least one heat sink (59) is provided on an electrical connection path (57) that electrically connects the DC socket contacts (13 ') and the energy store (58). is provided, wherein the at least one heat sink (59) is thermally connected to at least one of the DC socket contacts (13 '). Charging system (53) with a motor vehicle (motor vehicle) Claim 9 and a loading device (10) Claim 8 .

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