BE1031286B1 - Connector part for a charging system for charging an electric vehicle - Google Patents

Abstract

A plug connector part (3) for a charging system for charging an electric vehicle (4) comprises a plug section (301) for plugging into a mating plug connector part (5), at least one electrical plug contact (31A, 31B) arranged on the plug section (301) for transmitting a charging current, and at least one busbar (32A, 32B) which is electrically connected to the at least one plug contact (31A, 31B) and can be connected to a load line (21A, 21B) and which has a surface section (322) extending flatly along a plane (P). A cooling unit (33) has a housing (33) arranged on the surface section (322) and at least one cooling hose (333A, 333B, 335A, 335B) received on the housing (33) and resting on the surface section (322) for conducting a coolant flow (F).

Description

Connector part for a charging system for charging an electric vehicle

The invention relates to a connector part for a charging system for charging a

Electric vehicle according to the preamble of claim 1 and a charging system for charging an electric vehicle.

Such a connector part comprises a plug-in section for plugging into a mating connector part, at least one arranged on the plug-in section

Plug contact for transmitting a charging current and at least one busbar which is electrically connected to the at least one plug contact and can be connected to a load line and which has a surface section extending flatly along a plane.

Such a connector part can be designed as a charging plug or charging socket and can be arranged on a charging cable on the side of a charging station or on an electric vehicle. A charging plug arranged on a charging cable can be connected to a charging socket in order to create an electrical connection between a

charging station and the electric vehicle and to electrically charge the electric vehicle.

In the field of electromobility, it is desirable to charge electric vehicles quickly and efficiently in order to reduce charging times and associated interruption times.

In order to enable rapid charging of an electric vehicle during a fast charging process, high charging powers are used, combined with large charging currents, for example with a current of 700 A or even more.

For commercial vehicles, currents of up to 3000 A are even conceivable.

When large charging currents are transmitted, heating occurs at the

Contact elements and other components of the connector part. It is stipulated that heating of a connector part must not exceed 50 K. If high charging currents are used, care must be taken to ensure that the connector part does not heat up excessively.

The arrangement and dimensioning of electrical contact elements on

Connector parts for charging an electric vehicle is usually specified by standards. Contact geometries on such connector parts cannot therefore be easily scaled to potentially achieve a larger current carrying capacity on the

contact elements. One challenge is therefore to use existing

Contact geometries to enable the greatest possible power transfer.

In principle, it is possible to increase the current carrying capacity, for example, of a charging cable and a charging plug connected to the charging cable by increasing the cross-section of the current-carrying load lines. However, because a charging cable has to be handled manually by a user, the increase in the cross-section of the

Load cables and the associated increase in weight of the charging cable are limited.

One way to check the current carrying capacity of the charging cable, the charging plug and also the

To improve the charging socket, the provision of active cooling on the current-carrying

Components, especially on the charging cable and the part connected to the charging cable

Charging plug. If water or a water mixture (for example using antifreeze components) is used as the cooling medium, care must be taken to ensure that the cooling medium does not come into contact with live components. If water gets into

If the water comes into contact with components carrying direct current, there is a risk that the water will be electrolytically decomposed, which could lead to damage to the components.

In addition, contact between water and live components must always be excluded to avoid an electrical safety risk.

In a charging plug known from EP 3 103 173 B1, between

A cooling unit is arranged between the busbar components, through which a coolant flow can flow. A flow channel is defined in a housing of the cooling unit, which is designed to guide the coolant flow tangentially along the busbar components.

In a connector part known from DE 10 2016 107 409 A1, a coolant flow passes through heat sinks. The heat sinks are connected to associated contact elements via heat pipes in order to transfer heat to the

contact elements.

The object of the present invention is to provide a connector part which enables active cooling of current-carrying components in a cost-effective manner, with efficient heat absorption at the current-carrying components and reliable electrical insulation of a coolant flow from the current-carrying components.

This object is solved by an article having the features of claim 1.

Accordingly, the connector part has a cooling unit which has a housing arranged on the surface section and at least one cooling element received on the housing and

surface section has a cooling hose for directing a coolant flow.

The cooling unit comprises a housing on which one or more cooling hoses are accommodated, through which, during operation, a coolant flow is directed to absorb heat at the

The housing of the cooling unit is arranged on the surface section of the busbar, and the at least one cooling hose lies on the surface section of the associated busbar, so that the coolant flow is guided through the cooling hose and thus on the surface section and thus heat can be absorbed in a favorable manner on the surface section of the busbar.

Heat can be removed via the coolant flow and the busbar and thus the electrical contact connected to the busbar can be actively cooled.

The housing is arranged on the surface section of the busbar. The housing is preferably attached to the surface section, for example with the

Surface section glued or screwed.

The housing is preferably made of an electrically insulating material, in particular a plastic material. The busbar with the molded

In contrast, the surface section consists of a material with good electrical conductivity, in particular a metal material, for example a copper material.

In the cooling unit of the connector part, heat is absorbed and dissipated via a coolant that is guided in at least one cooling hose. The cooling hose is accommodated in the housing of the cooling unit and rests against the surface section of the associated busbar in such a way that the cooling hose with its hose wall is in (mechanical) contact with the busbar. The cooling hose can, for example, be formed from a flexibly deformable material, which makes it possible for a

Coolant through the cooling hose, the cooling hose is pressed against the surface section of the busbar due to the coolant pressure in its interior and thus a spatially dense positional relationship to the surface section with flat contact with the

surface section of the busbar. The cooling hose can thus efficiently absorb heat from the surface section and dissipate it from the surface section.

The plane along which the surface section of the busbar extends can be flat. However, the plane can also be curved so that the surface section of the

Busbar has a curved shape. For example, the busbar can

Be cylindrical in shape and the surface section corresponds to a wall section of the cylindrical

busbar.

In one embodiment, the housing is open on a side facing the surface section. The at least one cooling hose can thereby lie directly against the surface section on the side of the housing facing the surface section, so that a coolant flow flowing through the at least one cooling hose is guided to the surface section without an intervening housing wall and thus

Heat can be absorbed efficiently at the surface section.

For example, in one embodiment, the housing can have a receiving groove in which the at least one cooling hose is received. The receiving groove can, for example, be open towards the surface section of the busbar, so that the cooling hose can be inserted into the

Receiving groove and thus held on the housing, but in (direct) contact with the surface section of the busbar. The housing thus serves to hold and lay the at least one cooling hose and, if necessary, to electrically insulate several busbars, wherein the at least one

However, the cooling hose must be directly adjacent to the corresponding surface section of the busbar and can thus absorb heat directly from the busbar without

Intermediate layer of a housing wall.

Because the at least one cooling hose can be thin-walled, the thermal resistance of the at least one cooling hose can be kept low, so that

Heat can be efficiently absorbed and dissipated from the surface section of the busbar by the coolant flow.

In one embodiment, the at least one cooling hose is made of a flexibly deformable

Material molded.

The at least one cooling hose can be formed, for example, by a hose-shaped

Plastic film, in particular a film made of a high-performance plastic, for

Example of a material containing polyimide, in particular polysuccinimide (PSI),

Polybismaleimide (PBMI), polyimidesulfone (PISO) or polymethacrylimide (PMI), or a similarly high-performance plastic material. The plastic film is preferably (if used as intended during operation of the connector part)

temperatures) and provides electrical insulation with high

Dielectric strength is also available with small film thicknesses. 5

For example, the plastic film can have a thickness equal to or less than 0.1 mm, preferably equal to or less than 0.07 mm, more preferably equal to or less than 0.03 mm. Because the at least one cooling hose has a small thickness (wall thickness), a small thermal resistance results on the cooling hose, so that

Heat can be efficiently absorbed at the busbar and dissipated via the cooling unit.

The plastic film, especially when made of a polyimide material, should have a high, permanent dielectric strength with respect to the electrical potential between the

power contact and the coolant flow. The area-normalized thermal

Resistance of the cooling hose corresponds to the quotient of the thickness (wall thickness) of the

cooling hose and the specific thermal conductivity of the cooling hose material.

Thus, to minimize the thermal resistance, the wall thickness is small and/or the

Thermal conductivity should be selected to be large. Due to the fact that the thickness (wall thickness) of the cooling hose can be very small when using a plastic film, especially in the case of

Designed from a polyimide material, the thermal resistance at the

Cooling hose even with only medium specific thermal conductivity of the separating layer, for

Example in a range of 0.4 W/(mK), be small.

In one embodiment, the cooling hose is formed from a material containing silicone.

For example, the cooling hose can be made of a ceramic-filled silicone material. A ceramic filling, i.e. an embedding of ceramic particles in the

Silicone material, can provide good thermal conductivity on the hose wall of the

cooling hose can be obtained.

In one embodiment, the at least one cooling hose can be made of a material containing

Silicone rubber refers to elastomers made from silicone

Polymer chains consist of alternating oxygen and

silicon atoms, i.e. -Si-O-Si bonds (siloxane bonds). They are therefore also

Polyorganosiloxanes. In this embodiment, the at least one cooling hose can have a wall thickness equal to or less than 1 mm, preferably equal to or less than 0.5 mm. Such a cooling hose can have a high specific thermal conductivity on its hose wall, for example up to 5 W/(mK), and thus a low thermal

have contact resistance.

The at least one cooling tube can have additional functional layers, for example

vapor deposition in order to adapt the heat transfer and/or the dielectric strength for the intended application.

In one embodiment, the cooling unit has a thermally conductive heat conducting element which surrounds the at least one cooling hose on a side facing away from the surface section and is preferably in surface contact with the cooling hose. The

The heat conducting element can be formed, for example, by a metal sheet element that is inserted as an insert into a receiving groove on the housing. The heat conducting element extends on a surface section facing away from the associated busbar.

Side of the cooling hose and around the cooling hose so that heat can be transferred via the

Heat conducting element from the busbar also to the side facing away from the busbar

side of the cooling hose and can be absorbed and drained there by the coolant flow in the cooling hose.

For example, the heat conducting element can be designed as a bent sheet metal part.

The shape of the heat conducting element can correspond to a cross-sectional shape of a receiving groove in which the cooling hose is accommodated, so that the heat conducting element fits into the

can be inserted into the receiving groove and engages around the cooling hose in the receiving groove.

For example, the heat conducting element can have one or more wall sections with which the heat conducting element can be attached to the surface section of the associated

Busbar is in contact with the conductor rail. A thermal connection with the busbar is thus established via the wall sections, so that heat can be introduced from the surface section of the busbar into the heat conducting element and conducted via the heat conducting element to the cooling hose and into the cooling hose.

If the cooling unit has several cooling hoses arranged parallel to each other, the heat conducting element can, for example, be installed together in receiving grooves that

Cooling hoses can be used to encompass the cooling hoses together and thus conduct heat from the surface section of the associated busbar to and around the cooling hoses.

Several heat conducting elements can be arranged axially offset from one another on the housing so that thermal conduction occurs over a large axial length.

In one embodiment, the cooling unit has a first cooling hose for conducting the

Coolant flow along a first direction along the surface portion and a second

Cooling hose for directing a coolant flow along a second direction opposite to the first direction along the surface portion. The first

The cooling hose and the second cooling hose are each accommodated in the housing and rest against the surface section of the at least one busbar. The cooling hoses can, for example, be laid approximately parallel to one another.

Cooling hoses allow a coolant to be initially directed in the first direction on the surface section and then to flow back in the second direction via the second cooling hose. The cooling hoses can thus create a closed loop on the

Surface portion may be formed to conduct coolant back and forth across the surface portion, for example back and forth between coolant lines connected via a charging cable to the connector part (in this case implementing a charging plug).

For example, in one embodiment, the cooling unit can have a deflection piece for deflecting the coolant. The first cooling hose and the second cooling hose are each connected to the deflection piece. At the deflection piece, a coolant flow can be deflected, for example, by approximately 180°, so that the coolant flow directed through the first cooling hose is deflected at the deflection piece and returned to the second

cooling hose.

In one embodiment, the cooling unit has a coolant distributor to which at least one coolant line for conducting a coolant towards the connector part or away from the

connector part and to which the first cooling hose and the second

Cooling hose are connected. The coolant distributor can thus

Coolant lines, for example, in a connector part connected to the

Charging cable, to the cooling unit. The coolant distributor supplies coolant to the first cooling hose and drains it from the second cooling hose, so that a closed coolant flow is achieved at the surface section of the

busbar is caused.

If the connector part has a contact arrangement with several plug contacts and one associated busbar each, for example two plug contacts and two associated busbars, the coolant distributor can also be used to distribute the

Coolant can be distributed in cooling circuits on the different busbars. For example, each busbar can be assigned a first cooling hose and a second cooling hose, with coolant being distributed via the coolant distributor during operation of the

connector part into the first cooling hose and out of the second

cooling hose is drained.

For example, the at least one coolant line can be connected on a first side to the

The first cooling hose and the second

The cooling hoses are connected to the coolant distributor on a second side facing away from the first side. The first cooling hose and the second cooling hose are accommodated on the housing of the cooling unit and thus extend inside the

Cooling unit. The cooling water lines, which are for example guided in a charging cable connected to the connector part, can be connected to the outside of the

coolant distributor and thus connected to the cooling unit.

For example, the first cooling hose and the second cooling hose each extend between the coolant distributor and the associated deflection piece. The cooling hoses thus occupy a position between the coolant distributor and the deflection piece. Coolant is introduced into the first hose via the coolant distributor, which is then

diverter and slides via the second cooling hose back to the coolant distributor and is drained via the coolant distributor.

While the cooling hoses are preferably made of a flexibly deformable material, the coolant distributor and the deflection piece are formed as rigid elements, for example from an electrically insulating material that is not elastically deformable as intended. In the coolant distributor and the deflection piece,

Channels are formed through which coolant is passed to transport the coolant into the

To introduce cooling hoses or to drain them from the cooling hoses or to redirect the coolant.

In one embodiment, the connector part has two electrical plug contacts and two contact surfaces, each connected to one of the plug contacts and each having a surface section.

Busbars. The cooling unit is arranged between the surface sections of the busbars. The housing of the cooling unit is connected to the surface sections, for example glued or screwed to the surface sections. A coolant flow is directed to the surface sections via the at least one cooling hose of the cooling unit, with the surface section of each busbar being provided with one or more

Cooling hoses can be assigned so that coolant can be conducted via the cooling hoses in closed cooling circuits on the surface sections of the busbars. Heat can thus be efficiently absorbed and dissipated on both surface sections.

For example, in one embodiment, the surface section of each busbar is provided with a first cooling hose for conducting a coolant and a second cooling hose for

The cooling hoses are each connected to a (common) coolant distributor, to which coolant lines, for example of a

charging cable, which is connected to the connector part. The coolant distributor can thus supply coolant together into the different

The cooling water is introduced into the first cooling hoses assigned to the busbars and is discharged from the second cooling hoses assigned to the different busbars, so that different cooling circuits are provided on the busbars, which are connected to the common coolant distributor.

A charging system for charging an electric vehicle comprises a connector part of the type described above. Such a charging system also comprises a

Mating connector part that can be plugged into the connector part.

The connector part can, for example, implement a charging plug that is connected to a

charging cable. The mating connector part can, for example, be arranged as a charging socket on the electric vehicle and can be connected to the connector part in

The charging plug can be connected to a charging station via the charging cable, for example, so that when the charging cable is connected,

connector part and the mating connector part charging currents from the charging station to the

electric vehicle can be transferred.

It is also conceivable that the connector part has a charging socket on the side of a

electric vehicle realized.

A connector part of the type described here can be used in particular for transmitting

Charging currents in the form of direct currents. Such a connector part can also be used to transmit charging currents in the form of alternating currents.

The idea underlying the invention will be explained in more detail below using the embodiments shown in the figures. They show:

Fig. 1 is a view of a charging station with a charging cable arranged on it for

Connecting to an electric vehicle;

Fig. 2 is a view of an embodiment of a connector part in the form of a charging plug;

Fig. 3 shows another view of the connector part in the form of the charging plug;

Fig. 4 is a view of the connector part without a housing part;

Fig. 5 is a view of the connector part without a housing;

Fig. 6 is an exploded view of a contact arrangement of the connector part with a cooling unit arranged between busbars;

Fig. 7 is a view of the cooling unit between the busbars;

Fig. 8 is a sectional view along the line I-I of Fig. 7;

Fig. 9 is a sectional view along the line II-II of Fig. 8;

Fig. 10 is a sectional view along the line lII-IIl according to Fig. 8, in a

exploded view; and

Fig. 11 is a sectional view along line III-IIl of Fig. 8, in a non-exploded view.

Fig. 1 shows a charging system comprising a charging station 1, which is used to charge an electrically powered vehicle 4, also referred to as an electric vehicle. The charging station 1 is designed to provide a charging current in the form of an alternating current or a direct current and has a cable 2, which is connected at one end 201 to the charging station 1 and at another end 200 to a connector part 3 in the form of a charging plug.

As can be seen from the enlarged view according to Fig. 2, the connector part 3 has plug sections 300, 301 on a housing 30, with which the connector part 3 can be plugged into an associated mating connector part 5 in the form of a charging socket on the

Vehicle 4 can be engaged. In this way, the charging station 1 can be electrically connected to the vehicle 4 in order to transmit charging currents from the charging station 1 to the vehicle 4.

In order to ensure rapid charging of the electric vehicle 4, e.g. in the context of a so-called

To enable fast charging, the transmitted charging currents have a large

current, e.g. greater than 500 A, possibly even in the order of 700 A or more. Due to such high charging currents, the cable 2 and also the

Charging plug 3 and charging socket 5 result in thermal losses, which can cause the cable 2, charging plug 3 and charging socket 5 to heat up.

The permissible heating of components of the charging system is limited by standards, for example

For example, the maximum temperature is 50 K. It follows that measures must be taken to prevent excessive heating during charging, particularly when high currents are used, for example in the order of 700 A or more.

In the connector part 3 in the form of the charging plug according to Fig. 2 and 3, plug contacts are arranged on the upper plug section 300 on plug domes 302, which serve, for example, to transmit control signals or as a grounding contact. On the lower

In contrast, plug-in sections 301 have plug-in contacts 31A, 31B arranged on plug-in domes 303, which serve as load contacts for transmitting a charging current in the form of a

When plugged into the assigned

Mating connector part 5 in the form of the charging socket on the side of the electric vehicle 4, the plug contacts 31A, 31B come into electrical contact with associated mating contact elements on the side of the charging socket 5, so that a charging current from the charging station 1 to the

Electric vehicle 4 can be transferred.

The connector part 3 shown in the form of the charging plug has an active cooling system to dissipate heat, particularly in the area of the charging current.

Plug contacts 31A, 31B to receive and dissipate heat in order to limit the heating at the connector part 3.

In an embodiment shown in different views in Fig. 4 to 11, each plug contact 31A, 31B is assigned a busbar 32A, 32B, via which the respective plug contact 31A, 31B is connected to an associated load line 21A, 21B.

The plug contacts 31A, 31B are arranged on the plug section 301 within the plug domes 303 and are thus accessible from the outside for plugging the connector part 3 into the associated mating connector part 5. The busbars 32A, 32B, on the other hand, are arranged inside the housing 30 of the connector part 3 and are enclosed in a fluid-tight manner inside the housing 30 via a sealing sleeve 34, for example in the form of a rubber-elastic grommet, which is located between a

Plug-in sections 300, 301 forming the housing part and the cable 2 connected to the connector part 3, as can be seen from Fig. 4 and 5.

Each plug contact 31A, 31B has a contact section 310 in the form of a socket, via which a plug connection with an associated counter-contact element in

Form of a contact pin of the mating connector part 5. At an end 311 facing away from the contact section 310, the plug contact 31A, 31B is connected to an associated, flange-shaped end 321 of the associated busbar 32A, 32B, so that the respective plug contact 31A, 31B is mechanically fixed to the busbar 32A, 32B and electrically contacted with the busbar 32A, 32B.

At an end 320 facing away from the end 321, each busbar 32A, 32B is provided with a

Load lines 21A, 21B are connected, which together carry a charging current in the form of a direct current via the plug contacts 31A, 31B.

The load lines 21A, 21B are connected together in the connector part 3.

Charging cable 2 and enclosed in a cable sheath 20 of the charging cable 2 (see

Example Fig. 4).

Between the busbars 32A, 32B, a cooling unit 33 is arranged, which

Absorbing and dissipating heat at the busbars 32A, 32B. Each

Busbar 32A, 32B has a flatly extending surface section 322. The

Surface sections 322 of the busbars 32A, 32B extend parallel to one another and are each firmly connected to a housing 330 of the cooling unit 33 via screw connections, so that the busbars 32A, 32B are mechanically fixed to one another via the cooling unit 33.

The surface sections 322 of the busbars 32A, 32B each extend along a plane P spanned by a longitudinal direction X and a height direction Z (see Fig. 7 in conjunction with Figs. 9 and 10), wherein the surface sections 322 of the

Busbars 32A, 32B extend parallel to each other and are spaced apart along a transverse direction Y.

The housing 330 of the cooling unit 33 is made of an electrically insulating plastic material.

Cooling hoses 333A, 333B, 335A, 335B are accommodated in receiving grooves 337 on the housing 330 to provide cooling. Each busbar 32A, 32B is assigned a pair of cooling hoses 333A, 335A or 333B, 335B, which form a cooling circuit on the respectively assigned busbar 32A, 32B, via which cooling medium can be guided along the surface section 322 of the busbar 32A, 32B.

As can be seen from Fig. 7, the housing 330 is open on the sides facing the surface sections 322 of the busbars 32A, 32B, so that the housing 330 can accommodate the

Housing 30 formed receiving grooves 337 towards the surface sections 322 of the

Busbars 32A, 32B are not closed. The retaining grooves 337 accommodate

Cooling hoses 333A, 335A or 333B, 335B are thus in direct contact with the

Surface section 322 of the respectively associated busbar 32A, 32B.

The cooling unit 33 has a coolant distributor 331, which is arranged at one end of the cooling unit 33 facing the cable 2. At the other end of the housing 330 of the

In contrast, deflection pieces 334A, 334B are arranged in the cooling unit 33. The cooling hoses 333A, 335A and 333B, 335B extend between the coolant distributor 331 and an associated deflection piece 334A, 334B, wherein the cooling hoses 333A, 335A, 333B, 335B are connected to the coolant distributor 331 via connections 332A, 336A, 332B, 336B and are connected via them to coolant lines 23, 24 of the cable 2 in

flow connection, as can be seen, for example, from the exploded view according to Fig. 6 in conjunction with Figs. 7, 8 and 9.

The cooling hoses 333A, 335A, 333B, 335B are each made of a flexible, deformable

Material, for example from a ceramic-filled silicone material or from a

Plastic film, for example made of a polyimide material. The cooling hoses 333A, 335A, 333B, 335B of each pair of cooling hoses extend approximately parallel to each other and form coolant circuits on the respectively assigned surface section 322 of the busbars 32A, 32B. Coolant can be introduced into the cooling hose 333A or 333B, for example, via the coolant line 23, then flows along the

Cooling hose 333A or 333B, is diverted at the associated deflection piece 334A, 334B and flows back in the subsequent cooling hose 335A, 335B to the

Coolant distributor 331 into the coolant line 24, which drains the coolant.

As can be seen from the sectional view according to Fig. 9, the coolant distributor 331 serves to distribute the coolant from the coolant line 23 together into the connected

Cooling hoses 333A, 333B to the busbars 32A, 32B and thus the

Conversely, the coolant flows out of the cooling hoses 335A, 335B via the coolant distributor 331 and is discharged via the coolant distributor 331 into the coolant line 24 connected to it. This results in a parallel coolant flow F in the cooling circuits of the cooling hoses 333A, 335A and 333B, 335B assigned to the busbars 32A, 32B, whereby, as can be seen from the sectional view according to Fig. 8, the coolant flows through the

A coolant flow F is directed to the cooling hose 333A or 333B and is fed via the

Cooling hose 333B or 335B is returned.

The cooling hoses 333A, 335A and 333B, 335B are accommodated in the associated receiving grooves 337 of the housing 330 in such a way that they are in flat contact with the surface section 322 of the respectively associated busbar 32A, 32B. Because the cooling hoses 333A, 335A and 333B, 335B are flexibly deformable, they can cling to the surface section 322 and are pressed into flat contact with the surface section 322 due to the coolant pressure inside the cooling hoses 333A, 335A and 333B, 335B.

Because the cooling tubes 333A, 335A or 333B, 335B can be thin-walled and preferably made of a material with good thermal conductivity, for example a ceramic-filled silicone material, heat can be efficiently transferred to the

surface sections 322 of the busbars 32A, 32B and over the

Cooling hoses 333A, 335A or 333B, 335B.

In the embodiment shown, additional

Heat conducting elements 338 in the form of bent sheet metal elements made of a thermally highly conductive material, in particular a metal material, are arranged. Each pair of

Two heat conducting elements 338 are assigned to cooling hoses 333A, 335A and 333B, 335B, respectively, which are inserted into the receiving grooves 337 of the housing 330, as can be seen from Fig. 6 in conjunction with Figs. 10 and 11.

The heat conducting elements 338 receive the cooling hoses 333A, 335A and 333B, 335B in the receiving grooves 337 and enclose the cooling hoses 333A, 335A and 333B, 335B on a side facing away from the surface section 322 of the respective associated busbar 32A, 32B. The

Heat conducting elements 338 are in contact with the surface section 322, as can be seen from Fig. 11, so that the heat conducting elements 338 can absorb heat at the surface sections 322 and conduct it to the side of the cooling hoses 333A, 335A or 333B, 335B facing away from the surface section 322. Heat can thus be extensively distributed to the

Cooling hoses 333A, 335A or 333B, 335B and thus via coolant into the

Cooling hoses 333A, 335A or 333B, 335B can be efficiently drained.

The busbars 32A, 32B are firmly connected to the housing 330 of the cooling unit 33, for example screwed. The surface sections 322 of the

Busbars 32A, 32B are thus firmly connected to each other, so that a uniform

Contact arrangement for mounting on the connector part 3 is created.

The idea underlying the invention is not limited to the previously described

embodiments, but can also be implemented in other ways.

A connector part of the type in question here can implement a charging plug, for example on a charging cable, or a charging socket, for example on the side of an electric vehicle.

Such a connector part can be used in particular to transmit a charging current in the form of a direct current. However, it is also conceivable that the connector part can be used for

Transmitting a charging current in the form of an alternating current.

Active cooling can be provided on one plug contact or on several plug contacts.

A busbar can be designed as a separate component to a plug contact, but can also be formed integrally with the plug contact and thus by a section of the

Plug contact must be realized.

The surface section of the busbar can be flat. The surface section can also be curved. The separating layer for insulation is to be designed accordingly for the flat

Covering of the surface section of the busbar can be flat or curved.

Each busbar can also be assigned more than two cooling hoses, which are connected in series to form a (single) cooling circuit on the respective busbar or which are connected in parallel to form several parallel-connected cooling circuits.

Cooling circuits are connected to each other.

List of reference symbols 1 Charging station 2 Charging cable 20 Cable sheath 200, 201 End 21A, 21B Load line 23, 24 Coolant line 3 Charging plug 30 Housing 300, 301 Plug section 302, 303 Plug dome 31A, 31B Plug contact 310 Contact section 311 End 32A, 32B Busbar 320, 321 End 322 Surface section 33 Cooling unit 330 Housing 331 Coolant distributor 332A, 332B Connection 333A, 333B Cooling hose 334A, 334B Deflection piece 335A, 335B Cooling hose 336A, 336B Connection 337 Receiving groove 338 Heat conducting element 339 Wall section (web) 34 Sealing sleeve 4 Vehicle 5 Charging socket

E Insertion direction

F Coolant flow

P Level

X Longitudinal direction

Y transverse direction

Z Altitude direction

Claims (16)

Patent claims 1. Connector part (3) for a charging system for charging an electric vehicle (4), with a plug section (301) for plugging into a mating connector part (5), at least one electrical plug contact (31A, 31B) arranged on the plug section (301) for transmitting a charging current and at least one busbar (32A, 32B) which is electrically connected to the at least one plug contact (31A, 31B) and can be connected to a load line (21A, 21B) and which has a surface section (322) extending flatly along a plane (P), characterized by a cooling unit (33) which has a housing (33) arranged on the surface section (322) and at least one cooling hose (333A, 333B, 335A, 335B) received on the housing (33) and resting on the surface section (322) for conducting a coolant flow (F). 2. Connector part (3) according to claim 1, characterized in that the housing (330) is open on a side facing the surface portion (322). 3. Connector part (3) according to claim 1 or 2, characterized in that the housing (330) has a receiving groove (337) in which the at least one cooling hose (333A, 333B, 335A, 335B) is received. 4. Connector part (3) according to one of claims 1 to 3, characterized in that the at least one cooling hose (333A, 333B, 335A, 335B) is formed from a flexibly deformable material. 5. Connector part (3) according to one of the preceding claims, characterized in that the at least one cooling hose (333A, 333B, 335A, 335B) is formed from a material containing silicone. 6. Connector part (3) according to one of the preceding claims, characterized in that the cooling unit (33) has a thermally conductive VV sleeve conducting element (338) which surrounds the at least one cooling hose (333A, 333B, 335A, 335B) on a side facing away from the surface section (322). 7. Connector part (3) according to claim 6, characterized in that the heat-conducting element (338) has at least one wall section (339) which is in contact with the surface section (322). 8. Connector part (3) according to one of the preceding claims, characterized in that the cooling unit (33) has a first cooling hose (333A, 333B) for guiding a coolant flow (F) along a first direction along the surface section (322) and a second cooling hose (335A, 335B) for guiding a coolant flow (F) along a second direction opposite to the first direction along the surface section (322), wherein the first cooling hose (333A, 333B) and the second cooling hose (335A, 335B) are each received on the housing (330) and rest against the surface section (322) of the at least one busbar (31A, 31B). 9. Connector part (3) according to claim 8, characterized in that the cooling unit (33) has a deflection piece (334A, 334B) for deflecting the coolant, wherein the first cooling hose (333A, 333B) and the second cooling hose (335A, 335B) are each connected to the deflection piece (334A, 334B). 10. Connector part (3) according to claim 8 or 9, characterized in that the cooling unit (33) has a coolant distributor (331) to which at least one coolant line (23, 24) for conducting a coolant towards the connector part (3) or away from the connector part (3) can be connected and to which the first cooling hose (333A, 333B) and the second cooling hose (335A, 335B) are connected. 11. Connector part (3) according to claim 10, characterized in that the at least one coolant line (23, 24) can be connected to the coolant distributor (331) on a first side and the first cooling hose (333A, 333B) and the second cooling hose (335A, 335B) are connected to the coolant distributor (331) on a second side facing away from the first side. 12. Connector part (3) according to claim 11, characterized in that the first cooling hose (333A, 333B) and the second cooling hose (335A, 335B) each extend between the coolant distributor (331) and the deflection piece (334A, 334B). 13. Connector part (3) according to one of the preceding claims, characterized in that the connector part (3) has two electrical plug contacts (31A, 31B) and two busbars (32A, 32B), each connected to one of the plug contacts (31A, 31B) and each having a surface section (322), wherein the cooling unit (33) is arranged between the surface sections (322) of the busbars (32A, 32B). 14. Connector part (3) according to claim 13, characterized in that the housing (330) of the cooling unit (33) is connected to both surface sections (322). 15. Connector part (3) according to claim 13 or 14, characterized in that at least one cooling hose (333A, 333B, 335A, 335B) is assigned to the surface section (322) of each busbar (31A, 31B) and is in contact with the assigned surface section (322). 16. Charging system for charging an electric vehicle (4), with a connector part (3) according to one of the preceding claims.