DE102016211464A1 - Power contact system for a charging plug and / or a charging socket, charging plug and charging station for delivering electrical energy to a receiver of electrical energy - Google Patents

Abstract

The present invention discloses a power contact system (1) for a charging plug (100) and / or a charging socket, having at least one power contact (10) with a first connection region (11) for electrical connection to an electrical energy receiver and a second connection region (12) galvanic connection to a charging line (120), wherein the power contact system is characterized in that the power contact system (1) at least one Peltier element (20), wherein a cold side (21) of the Peltier element (20) with the second connection region (12) of the power contact (10) is in direct contact.

Description

The present invention relates to a power contact system for a charging plug and / or a charging socket. Furthermore, the present invention relates to a charging plug for coupling with a corresponding connecting device and for transmitting electrical energy. Furthermore, the present invention relates to a charging station for delivering electrical energy to a receiver of electrical energy.

Charging plugs for electrically driven vehicles are known from the prior art, which are designed for connection to a corresponding, designed as a socket, Verbindungsvor direction. In this regard, on the in the DE 10 2012 105 774 B3 disclosed charging connector referenced. Power contacts are arranged in the charging plug, each having a first connection region and a second connection region. The first connection region is designed as a contact socket and suitable for galvanic connection with a contact pin, wherein the contact pin is electrically connected to an electrical energy receiver, such as a battery of a vehicle. The second connection region of the power contact is designed for galvanic connection to an electrical energy source, for example a charging station or in general with an electrical supply network. By way of example, the second connection region can be permanently connected to a charging line.

Due to a charging current flowing through the power contact, the power contact designed as a power plug contact inevitably heats up due to ohmic current heat losses. However, the heating of the power contact is limited to a limit temperature increase. For example, according to the Standard IEC 62196-3 the limit temperature increase is limited to 50K. This in turn leads to a maximum charging current of up to 200 A continuous load for largely standardized connector geometries.

With an intermittent charging of a rechargeable battery, however, higher charging currents of 350 A and more over limited periods of time are necessary to charge the rechargeable battery in a desired short time. This in turn leads to a temporary heating of the power contacts, which is above the limit temperature increase. The line cross-section of the power contact can not be increased arbitrarily, since the connector geometries are standardized and beyond for the power contacts the smallest possible amount of conductive material, usually copper, to be used.

The present invention has for its object to provide a power contact system that allows increased charging currents at a limited heating, thus having an increased current carrying capacity.

This object is achieved by a power contact system having the features of claim 1. Advantageous embodiments are described in the claims dependent on claim 1.

It is a further object of the present invention to provide a charging plug by means of which increased charging currents can be transmitted without the charging plug being excessively heated.

This object is achieved by a charging plug with the features of claim 7. Advantageous embodiments of the charging plug are described in the dependent of claim 7 claims.

Finally, the present invention is also based on the object of providing a charging station for delivering electrical energy to a receiver of electrical energy, by means of which increased peak charging currents can be transmitted.

This object is achieved by a charging station having the features of claim 11. Advantageous embodiments of the charging station are described in the claims dependent on claim 11.

More specifically, the object underlying the present invention is achieved by a power contact system for a charging plug and / or a charging socket, wherein the power contact system at least one power contact with a first connection region for electrical connection to an electrical energy receiver or energy transmitter and a second connection region for galvanic connection with a Charging line has. The power contact system according to the invention is characterized in that it comprises at least one Peltier element, wherein a cold side of the Peltier element is in direct contact with the second connection region of the power contact.

Of course, the power contact system may also have more than one power contact. Furthermore, the power contact system according to the invention may have a number of Peltier elements corresponding to the number of power contacts, the respective cold sides of the Peltier elements each being in direct contact with a second connection region of the respective power contacts.

By means of the power contact system according to the invention, larger charging currents can be transmitted since the power contact / the power contacts of the power connection system is actively actively cooled by means of a Peltier element / number of Peltier elements corresponding to the number of power contacts. As a result, the ohmic losses of the power contact / the power contacts are reduced, so that by means of the power contact / the power contacts larger charging currents are transferable.

A cold side of a Peltier element is to be understood as the side of the Peltier element which is cooled when the Peltier element is energized. The cold side can also be referred to as a cold surface. A hot side of a Peltier element is to be understood as the side of the Peltier element which is heated when the Peltier element is energized. The hot side may also be referred to as a heating side or as a hot surface or as a heating surface.

The first connection region can be made galvanically connectable with a plug-in contact. Preferably, the first connection region is designed as a resilient contact region, which has a plurality of partially cylindrical contact springs. Further preferably, the first connection region is designed as a contact socket with a receiving space. The first connection region of the power contact can also be referred to as a front-side connection region or front-side connection section or else as a front-side functional region.

The second terminal region of the power contact is usually electrically / galvanically connected to a charging line and is thus connected to a source of electrical energy for electrical connection. The second connection region can also be referred to as the rear connection region or as the rear connection segment or else as the rear functional region. The receiver of electrical energy may for example be an accumulator. In particular, the accumulator may be a vehicle battery of an electrically drivable vehicle.

The power contact system may also be referred to as an electrical contact system or as an electrical connection body system. The power contact can also be referred to as an electrical connection body.

The power contact system is preferably designed such that the second connection region of the power contact has at least one flattened contact surface, wherein the cold side of the Peltier element is in direct contact with the flattened contact surface of the second connection region.

By a corresponding design of the power contact / the power contacts, a more efficient heat coupling of the second connection region (s) to the Peltier element (s) is ensured, so that the power contact (s) can be cooled more efficiently.

The Peltier element and in particular the cold side of the Peltier element is preferably also flat, i. just trained. Further preferably, the power contact system is designed such that the connection between the second connection region of the power contact and the cold side of the Peltier element by means of a thermally conductive adhesive and / or by means of a thermal grease.

As a result, unavoidable gaps between the second connection region of the power contact and the cold side of the Peltier element are closed so that an improved heat transfer from the power contact to the Peltier element is formed.

A thermally conductive adhesive and / or a thermal grease usually comprise ceramic and / or metal particles.

According to an advantageous embodiment of the power contact system, this further comprises at least one cooling element, which is in direct contact with a hot side of the Peltier element, so that the Peltier element is sandwiched between the second connection region of the power contact and the cooling element.

Thereby, a larger differential temperature between the cold side and the hot side of the Peltier element can be achieved, whereby the Peltier element can be operated more efficiently, so that the power contact / the power contacts can be cooled more efficiently. Thus, by means of an appropriately designed power contact system, even larger charging currents can be transmitted.

The cooling element, which may also be referred to as a heat sink, preferably has at least one cooling fin. As a result, the heat of the hot side of the Peltier element can be removed even better.

Further preferably, the power contact system is designed such that the connection between the cooling element and the hot side of the Peltier element by means of a thermally conductive adhesive and / or by means of a thermal grease.

According to a further advantageous embodiment of the power contact system, this has at least two power contacts and a number of power contacts corresponding number of Peltier elements, wherein the cooling element is in direct contact with the respective hot sides of the Peltier elements.

A corresponding power contact system has a reduced number of components and a simple construction, since a cooling element can be in direct contact with more than one Peltier element.

Preferably, the power contact system is designed such that the cooling element has a cooling fluid inlet connection and a cooling fluid outlet connection fluidly connected thereto by means of a cooling fluid channel arranged inside the cooling element, so that a cooling fluid can flow through the cooling element.

Thereby, a larger differential temperature between the cold side and the hot side of the Peltier element can be achieved, whereby the Peltier element can be operated more efficiently, so that the power contact / the power contacts can be cooled more efficiently. Thus, by means of an appropriately designed power contact system, even larger charging currents can be transmitted.

As the cooling fluid, any cooling fluid, both liquid and gaseous, can be used. For example, water and / or ketones, in particular fluorinated ketones, can be used as the cooling fluid. Further, nitrogen can also be used as the cooling fluid. But it is also possible that compressed air is used as the cooling fluid, which is to be understood under compressed air pressurized breathing air. The cooling element cools the hot side of the Peltier element. Consequently, by means of the power contact system according to the invention with a constant line cross-section of the power contact / the power contacts larger charging currents can be transmitted without the power contact / the power contacts excessively heated / heated.

The cooling fluid inlet can also be referred to as the first cooling fluid connection and the cooling fluid outlet as the second cooling fluid connection.

The cooling fluid channel is disposed within the cooling element, preferably within a cavity of the cooling element or formed by the cavity of the cooling element. The cooling fluid channel is fluid-separated from a contact surface of the cooling element. For example, the contact surface of the cooling element is separated from the fluid channel by a wall. The cooling fluid is therefore not in direct contact with the Peltier element.

The object on which the present invention is based is also achieved by a charging plug for coupling to a corresponding connecting device and for transmitting electrical energy, the charging plug being characterized in that it has at least one power contact system arranged above and arranged in a charging plug housing, the second connecting region of the Power contact with a charging line is electrically connected, and wherein the first connection region of the power contact is accessible via a contact side of the charging connector housing.

The charging plug according to the invention allows increased charging currents while maintaining predetermined cable cross-sections, without the charging plug and components within the charging plug, in particular the power contacts, overheating during power transmission.

Preferably, the charging plug is formed such that the at least one power contact is fixed in the charging plug housing such that a surface normal of the flattened contact surface of the power contact is oriented perpendicular to a plug-in direction of the charging plug and in the direction of a side wall of the charging plug housing, wherein the charging plug housing at least one in the Sidewall disposed side wall opening, and wherein the indirectly connected to the flattened contact surface via the Peltier element cooling element closes the side wall opening.

In the case of a correspondingly designed charging plug, the heat removed from the hot side of the Peltier element or from the hot sides of the Peltier elements and via the cooling element or the cooling elements can again be given off to the environment in an improved manner, so that the temperature in the charging plug housing interior is reduced.

According to a further advantageous refinement of the charging plug, the latter has at least two power contacts which are fastened in the charging plug housing such that surface normals of the respective flattened contact surfaces of the power contacts are oriented perpendicular to a plug-in direction of the charging plug and in the direction of an upper side or a lower side of the charging plug housing. wherein the cooling element is in indirect contact with each of the flattened contact surfaces of the power contacts by means of at least one Peltier element.

The top of the charging connector housing can also be referred to as a cover of the charging connector housing. The underside of the charging plug housing can also be referred to as the bottom of the charging plug housing.

The correspondingly designed charging plug is compact, since the cooling element is in contact with a plurality of Peltier elements and therefore also indirectly with a plurality of power contacts, so that only a single cooling element is necessary for cooling the power contacts.

Preferably, the charging plug is designed such that the cooling fluid inlet connection with a cooling fluid supply line and the cooling fluid discharge connection with a cooling fluid discharge line are fluid-connected.

In the case of the correspondingly designed charging plug, the heat generated in the power contacts can be removed again in an improved manner, so that once again increased charging currents can be transmitted by means of the correspondingly formed charging plug.

The object of the present invention is further achieved by a charging station for delivering electrical energy to a receiver of electrical energy, wherein the charging station is characterized in that this charging station has a charging plug as described above.

The charging station is preferably designed such that it also has a source of cooling fluid, which is in fluid communication with the cooling fluid inlet connection of the cooling element.

Further advantages, details and features of the invention will become apparent from the illustrated embodiments. In detail:

1A a perspective view of a charging plug according to the invention;

1B : the in 1 viewed charging connector viewed obliquely from behind;

2 : a rear portion of a charging connector housing in the 1A and 1B shown charging plug;

3 a power contact system according to the present invention disassembled;

4A : an exploded view of a frontal area of the in the 1A and 1B shown charging plug, wherein the rear portion of the charging plug is not shown;

4B : the in 4A shown frontal area in the assembled state;

5 a perspective view of a charging plug according to the invention according to another embodiment of the present invention;

6 : a frontal area of the in 5 shown charging plug, wherein the rear portion of the charging plug is not shown;

7A a power contact system according to another embodiment of the present invention with two power contacts, two Peltier elements and a disassembled cooling element; us

7B : this in 7A shown power contact system in the assembled state.

In the following description, like reference numerals denote like components or like features, so that a description made with respect to a figure with respect to a component also applies to the other figures, so that a repetitive description is avoided. Furthermore, individual features described in connection with one embodiment may also be used separately in other embodiments.

In the 1A and 1B is an inventive charging plug 100 shown for coupling with a corresponding and not shown in the figures connecting device and for transmitting electrical energy. In the illustrated charging plug 100 it is a charging plug 100 for the so-called Combined AC / DC Charging System, that a charging system for electric vehicles after IEC 62196 is and supports an AC (AC) and DC (DC) charging. The combined AC / DC charging system essentially consists of a socket on the vehicle, the so-called inlet, and the charging plug 100 ,

Like from the 1A and 1B it can be seen has the charging plug 100 a charging connector housing 110 in which a grab handle 117 to handle the charging plug 100 is trained. End is the charging plug 100 with a charging cable 140 connected, which can also be referred to as a supply cable, by means of the charging plug 100 connected to a charging station, not shown, or is connectable. A front contact page 116 of the charging plug 100 is in a charging socket, not shown, for example one electrically powered motor vehicle insertable. The charging plug 100 has a frontal area 100_1 and a back area 100_2 on.

In 2 is the charging connector housing 110 with disassembled front area 100_1 shown. The charging connector housing 110 has two side walls 112 , a top 113 which also serves as a lid 113 can be designated, and a bottom 114 that also as ground 114 can be designated. In each of the side walls 112 of the charging connector housing 110 is in each case a side wall opening 115 arranged.

From the 1A and 1B It can also be seen that the side wall openings 115 each by a cooling element 30 are closed. Thus stands each cooling element 30 in direct contact with the outside of the charging plug 100 ,

In 3 is a power contact system according to the invention 1 for in the 1A and 1B illustrated charging plug 100 shown. The power contact system 1 has at least one power contact 10 on, the first as a contact socket 11 trained connection area 11 which is designed for electrical connection to an electrical energy receiver, which may be a battery of an electric vehicle in the present embodiment. More specifically, the contact socket 11 formed for receiving a contact pin, not shown in the figures. The power contact 10 further comprises a second connection area 12 for galvanic connection with a charging line 120 (please refer 4A . 4B and 6 ) is trained. The charging line 120 in turn is connected to an electrical energy source, not shown. This electrical energy source may be, for example, a charging station for an electrically driven motor vehicle.

The contact socket 11 is segmented. For this purpose, the contact socket 11 a plurality of longitudinal recesses so that the contact socket 11 one of the number of longitudinal recesses corresponding number of shell segments 14 having. In the illustrated embodiment, the shell segments 14 as cylinder jacket segments 14 educated.

The radial distances of the cylinder jacket segments 14 are mutually variable, ie the individual cylinder jacket segments 14 can be forced apart under enlargement of the longitudinal recesses, for example when the contact socket 11 is pushed onto a contact pin, not shown in the figures and provided for example on the vehicle side. This will provide a reliable electrical / galvanic connection between the contact socket 11 and reached the contact pin.

The second connection area 12 of the power contact 10 is designed to be with a charging line 120 to be electrically connected, so by inserting a contact pin, not shown in the figures in the receiving space of the contact socket 11 via the power contact 10 a charging current is transferable.

The power contact system 1 also has a Peltier element 20 on that a cold side 21 and a hot side 22 having. The cold side 21 is the side of the Peltier element 20 , which when the Peltier element is energized via the electrical connection lines 23 of the Peltier element is cooled. The hot side 22 of the Peltier element 20 is the side of the Peltier element 20 when energizing the Peltier element 20 is heated.

The second connection area 12 of the power contact 10 has a flattened contact surface 15 on, so that an improved heat transfer from the cold side 21 of the Peltier element 20 on the second connection area 12 is realized. The power contact system 1 also has a cooling element 30 with a variety of cooling fins 31 on. The cooling element 30 that also acts as a heat sink 30 can be referred to, is with the hot side 22 of the Peltier element 20 connectable to the removal and improved radiation of the heat. The cold side 21 of the Peltier element 20 can by means of a thermally conductive adhesive and / or by means of a thermal paste with the flattened contact surface 15 of the second connection area 12 be connected. Furthermore, the hot side 22 of the Peltier element 20 by means of a thermally conductive adhesive and / or by means of a thermal paste with the cooling element 30 get connected.

In the assembled power contact system 1 is therefore the Peltier element 20 sandwiched between the second terminal area 12 of the power contact 10 and the cooling element 30 arranged.

In the 4A and 4B is the front area 100_1 in the 1A and 1B illustrated charging plug 100 shown, in 4A the front area 100_1 is shown in the disassembled state, wherein in 4B the front area 100_1 is shown in the assembled state. It can be seen that the power contact system 1 two power contacts 10 , two Peltier elements 20 and two cooling elements 30 having.

Furthermore, from the 4A and 4B it can be seen that the power contacts 10 such in the Charging plug housing 110 are fixed, that the surface normal N of the flattened contact surfaces 15 the power contacts 10 perpendicular to a plug-in direction R of the charging plug 100 and in the direction of the respective side walls 112 of the charging connector housing 110 are oriented. This makes it possible for the respective cooling element 30 through the side wall openings 115 of the charging connector housing 110 protrude through or at least close, so that the respective cooling elements 30 with the environment of the charging plug 100 to be in direct contact. Consequently, those in the power contacts 10 generated heat dissipated efficiently and to the environment of the charging connector 100 be delivered.

In 5 is a charging plug 100 according to another embodiment of the present invention. The charging connector housing 110 of in 5 illustrated charging plug 100 is essentially the same structure as the charging plug housing 110 in the 1A and 1B illustrated charging plug 100 , where in the side walls 112 no side wall openings in 115 are provided.

In 6 is the front area 100_1 of in 5 illustrated charging plug 100 in isolation and without the back area 100_2 of the charging plug 100 so that a charging plug housing interior 111 is recognizable. That in the in 5 illustrated charging plug 100 built-in power contact system 1 is in the 7A and 7B shown. 7A shows the power contact system 1 according to another embodiment of the present invention in the disassembled state, whereas in 7B the power contact system 1 is shown in the assembled state.

In the power contact system 1 according to the further embodiment of the present invention is only a single cooling element 30 provided, the a Kühlfluidzulaufanschluss 32 and one with it by means of one inside the cooling element 30 arranged cooling fluid duct fluid-connected cooling fluid drain port 33 so that the cooling element 30 can be flowed through by a cooling fluid. Out 6 It can be seen that the cooling fluid inlet connection 32 with a cooling fluid supply line 130 fluidly connected, whereas the cooling fluid drain port 33 with a cooling fluid drain line 131 connected is. Both the cooling fluid supply line 130 as well as the cooling fluid drain line 131 can in the charging cable 140 be arranged that in addition also at least the two charging lines 120 that with the two power contacts 10 are galvanically connected.

By flowing through the cooling element 30 with a cooling fluid that can be from the power contacts 10 and the hot sides 22 the Peltier elements 20 generated heat to be dissipated again improved.

Out 6 it can be seen that the charging plug 100 two power contacts 10 having in the charging connector housing 110 are fixed, that the surface normal N of the respective flattened contact surfaces 15 the second connection areas 12 the power contacts 10 in each case perpendicular to the plug-in direction R of the charging plug 100 and towards the top 113 of the charging connector housing 110 are oriented. The cooling element 30 stands with both Peltier elements 20 , in more detail with the respective hot sides 22 the Peltier elements 20 in direct contact. The respective cold sides 21 of the two Peltier elements 20 stand as in the power contact system 1 according to the first embodiment of the present invention with the respective flattened contact surfaces 15 the second connection areas 12 the two power contacts 10 in direct contact.

The cold sides 21 the Peltier elements 20 can by means of a thermally conductive adhesive and / or by means of a thermal paste with the respective flattened contact surfaces 15 the second connection areas 12 be connected. Furthermore, the hot sides 22 the Peltier elements 20 by means of a thermally conductive adhesive and / or by means of a thermal paste with the cooling element 30 get connected.

LIST OF REFERENCE NUMBERS

1

 Power Contact System

10

 Power contact / electrical connection body

11

 first connection area / contact socket (of the power contact)

12

 second connection area (of the power contact)

13

 (cylindrical) contact surface (of the second connection area)

14

 Sheath segment / cylinder jacket segment (the contact socket)

15

 (flattened) contact area (of the second connection area)

16

 Fastening device / mounting flange (of the power contact)

20

 Peltier element

21

 Cold side (of the Peltier element)

22

 Hot side (of the Peltier element)

23

 Electric connection cable (of the Peltier element)

30

 cooling element

31

 Cooling fin (of the cooling element)

32

 Cooling fluid supply port

33

 Cooling fluid outflow port

100

Charging plug / connector

110

Charging plug housing

100_1

 Front area (of the charging plug)

100_2

 rear area (of the charging plug)

111

Charging plug housing interior

112

 Sidewall (of the charging connector housing)

113

 Cover / top side (of the charging connector housing)

114

 Bottom / bottom (of the charging connector housing)

115

 Sidewall opening (of the charging connector housing)

116

Contact side (of the charging connector housing)

117

 Grab handle (of the charging plug housing)

120

 Charging cable (of charging plug)

130

 Cooling fluid supply line (of charging plug)

131

 Cooling fluid drainage line (of charging plug)

140

 Charging cable / power cable

R

 Plug-in direction (of the charging plug)

N

 Surface normal (the flattened contact area)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102012105774 B3 [0002]

Cited non-patent literature

• Standard IEC 62196-3 [0003]
• IEC 62196 [0057]

Claims (12)

Power contact system ( 1 ) for a charging plug ( 100 ) and / or a charging socket, with - at least one power contact ( 10 ) with a first connection area ( 11 ) for electrical connection to an electrical energy receiver or energy transmitter and a second connection area ( 12 ) for galvanic connection with a charging line ( 120 ), characterized in that the power contact system ( 1 ) comprises: the power contact system ( 1 ) has at least one Peltier element ( 20 ) on; and - a cold side ( 21 ) of the Peltier element ( 20 ) stands with the second connection area ( 12 ) of the power contact ( 10 ) in direct contact. Power contact system ( 1 ) according to claim 1, characterized by the following features: - the second connection region ( 12 ) of the power contact ( 10 ) has at least one flattened contact surface ( 15 ) on; and - the cold side ( 21 ) of the Peltier element ( 20 ) stands with the flattened contact surface ( 15 ) of the second connection area ( 12 ) in direct contact. Power contact system ( 1 ) according to one of the preceding claims, characterized in that the connection between the second connection region ( 12 ) of the power contact ( 10 ) and the cold side ( 21 ) of the Peltier element ( 20 ) by means of a thermally conductive adhesive and / or by means of a thermal compound. Power contact system ( 1 ) according to one of the preceding claims, characterized in that the power contact system ( 1 ) at least one cooling element ( 30 ), which with a hot side ( 22 ) of the Peltier element ( 20 ) is in direct contact, so that the Peltier element ( 20 sandwiched between the second terminal area (FIG. 12 ) of the power contact ( 10 ) and the cooling element ( 30 ) is arranged. Power contact system ( 1 ) according to claim 4, characterized by the following features: - the power contact system ( 1 ) has at least two power contacts ( 10 ) and one of the number of power contacts ( 10 ) corresponding number of Peltier elements ( 20 ) on; - the cooling element ( 30 ) stands with the respective hot sides ( 22 ) of the Peltier elements ( 20 ) in direct contact. Power contact system ( 1 ) according to at least one of claims 4 or 5, characterized in that the cooling element ( 30 ) a cooling fluid inlet connection ( 32 ) and one with this by means of one within the cooling element ( 30 ) arranged cooling fluid channel fluid-connected cooling fluid drain port ( 33 ), so that the cooling element ( 30 ) can be flowed through by a cooling fluid. Charging plug ( 100 ) for coupling with a corresponding connecting device and for transmitting electrical energy, characterized in that the charging plug ( 100 ) at least one in a charging connector housing ( 110 ) arranged power contact system ( 1 ) according to one of the preceding claims, wherein the second connection region ( 12 ) of the power contact ( 10 ) with a charging line ( 120 ) is electrically connected, and wherein the first connection area ( 11 ) of the power contact ( 10 ) via a contact page ( 112 ) of the charging connector housing ( 110 ) is accessible. Charging plug ( 100 ) according to claim 7, wherein the charging plug ( 100 ) a power contact system ( 1 ) according to a combination of claim 2 with at least one of claims 4 to 6, characterized by the following features: - the at least one power contact ( 10 ) is in the charging connector housing ( 110 ), that a surface normal (N) of the flattened contact surface ( 15 ) of the power contact ( 10 ) perpendicular to a plug-in direction (R) of the charging plug ( 100 ) and in the direction of a side wall ( 112 ) of the charging connector housing ( 110 ) is oriented; - the charging connector housing ( 110 ) has at least one in the side wall ( 112 ) arranged side wall opening ( 115 ) on; and - with the flattened contact surface ( 15 ) indirectly via the Peltier element ( 20 ) connected cooling element ( 30 ) closes the side wall opening ( 115 ). Charging plug ( 100 ) according to claim 7, wherein the charging plug ( 100 ) a power contact system ( 1 ) according to a combination of claim 2 with at least one of claims 4 to 6, characterized by the following features: - the charging plug ( 100 ) has at least two power contacts ( 10 ) in such a way in the charging connector housing ( 110 ) are surface normal (N) of the respective flattened contact surfaces ( 15 ) of the service contacts ( 10 ) each perpendicular to a plug-in direction (R) of the charging plug ( 100 ) and in the direction of an upper side ( 113 ) or a bottom ( 114 ) of the charging connector housing ( 110 ) are oriented; and - the cooling element ( 30 ) is by means of at least one Peltier element ( 20 ) with each of the flattened contact surfaces ( 15 ) of the service contacts ( 10 ) in indirect contact. Charging plug ( 100 ) according to at least one of claims 7 to 9, wherein the charging plug ( 100 ) a power contact system ( 100 ) according to claim 6, characterized in that the Cooling fluid inlet connection ( 32 ) is connected to a cooling fluid supply line ( 130 ) and the cooling fluid drain connection ( 33 ) is with a cooling fluid drain line ( 131 ) fluidly connected. Charging station for delivering electrical energy to a receiver of electrical energy, characterized in that the charging station is a charging plug ( 100 ) according to one of claims 7 to 10. Charging station according to claim 11, wherein the charging station has a charging plug ( 100 ) according to claim 10, characterized in that the charging station further comprises a cooling fluid source connected to the cooling fluid inlet port ( 23 ) of the cooling element ( 30 ) is fluidly connected.

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