BE1030266B1 - 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-in section (301) for plug-in connection with a mating plug-in connector part (5), at least one electrical plug-in contact (31A, 31B) arranged on the plug-in 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), 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 a chamber arrangement (332) arranged in the housing (33) for guiding a coolant flow (F), the chamber arrangement (332) having a plurality of each other Comprises chambers (335-1...335-11) in flow communication and at least some of the chambers (335-1...335-11) are designed to allow a coolant flow (F) along a flow direction (S) perpendicular to the plane (P). lead.

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 plug connector part comprises a plug-in section for plug-in connection with a mating plug-in connector part, at least one arranged on the plug-in section

Plug-in contact for transmitting a charging current and at least one busbar which is electrically connected to the at least one plug-in 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 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 establish an electrical connection between one

To produce a charging station and the electric vehicle and to charge the electric vehicle electrically.

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

In order to enable rapid charging of an electric vehicle as part of 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 charging

Currents of up to 3000 A are conceivable for commercial vehicles.

When large charging currents are transferred, heating occurs

Contact elements and other components of the connector part. It is stipulated that heating on a connector part must not exceed 50 K. If large 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

Connector parts for charging an electric vehicle are usually required by standards. Contact geometries cannot therefore be easily scaled on such connector parts in order to possibly achieve a greater current carrying capacity

to reach contact elements. A challenge is therefore to work with existing ones

Contact geometries to enable the greatest possible power transfer.

In principle, it is possible to increase the current carrying capacity, for example on 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 cross-section is the

There are limits to load cables and the associated increase in weight on the charging cable.

A way to check the current carrying capacity on the charging cable, on the charging plug and also on the

To improve the charging socket is to provide active cooling on the current-carrying socket

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

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

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

In addition, contact of water with live components must always be ruled out to avoid an electrical safety risk.

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

Busbar components have a cooling unit arranged 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 flows through heat sinks. The heat sinks are connected to associated contact elements via heat lines in order to transfer heat to the heat lines

to accommodate contact elements.

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

This task is solved by an object with the features of claim 1.

Accordingly, the connector part has a cooling unit which has a housing arranged on the surface section and a chamber arrangement arranged in the housing

Conducting a coolant flow. The chamber arrangement comprises a plurality of chambers that are in fluid communication with one another. At least some of the chambers are designed to allow coolant flow along a plane perpendicular to the plane

To guide flow direction.

The cooling unit includes a housing in which chambers are formed through which during operation

Coolant flow to absorb heat at the point connected to the plug contact

Conductor rail is conducted. The housing of the cooling unit is arranged on the surface section of the busbar, so that the coolant flow is conducted through the housing and thereby to the surface section and thus heat in a favorable manner

Surface section of the busbar can be accommodated. The heat can be transported away 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 on it

In contrast, the surface section consists of an electrically highly conductive material, in particular a metal material, for example a copper material.

The coolant flow is directed via the chamber arrangement in such a way that it passes through at least some of the chambers along a plane perpendicular to the plane of the surface section

Flow direction flows. The coolant flows through some of the chambers into the

Flow direction directed towards the surface section and thus hits it perpendicularly

area section. In contrast, the coolant flow is directed away from the surface section through other chambers in the opposite direction to the flow direction. Because of that

If the coolant flow is directed perpendicularly to the surface section, it can be achieved that

Heat is absorbed on the surface section with a good heat transfer coefficient and thus with great effectiveness of the cooling, in particular in comparison to a coolant flow directed tangentially (parallel) to the surface section.

The plane can be flat. 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 chambers on the side facing the surface section are therefore open

Surface section facing, so that a coolant flow flowing through the chambers is directed to the surface section without an intermediate housing wall and thus

Heat can be absorbed efficiently at the surface section.

The cooling medium is an electrically non-conductive fluid, for example an oil-based one

Cooling medium is used, no special precautions need to be taken to electrically isolate the cooling medium from the surface section. Between the housing and the

In this case, a seal can be arranged in the surface section in order to prevent the cooling medium from escaping between the housing and the surface section.

If, on the other hand, water or another electrically conductive fluid is used as the cooling medium, it must be ensured that the surface section is electrically insulated from the cooling medium.

In one embodiment, this can be achieved, for example, by:

An electrically insulating separating layer is arranged on the surface section, via which electrical insulation is produced between the surface section and the cooling medium in the housing. The separating layer covers the surface section of the busbar in such a way that the surface section is arranged on a first side of the separating layer

Coolant flow, however, flows on a second side of the separating layer in the housing. The

Coolant flow is in contact with the separating layer, so that the separating layer acts as a (direct) intermediate layer and separates the coolant flow from the surface section.

The separation layer is in contact with the surface portion on the first side. On the second

On the other hand, the coolant flows on the side of the separating layer. Heat can therefore pass through the

Separating layer passes from the surface section into the coolant flow and thus from the

Coolant flow is absorbed and drained away.

Because the separating layer can be made thin, the thermal resistance of the separating layer can be kept low so that heat can be removed from it

Surface section of the busbar can be efficiently absorbed and discharged by the coolant flow. 5

The separating layer can be formed, for example, by a plastic film, in particular a film made of a high-performance plastic, for example containing a material

Polyimide, in particular polysuccinimide (PSI), polybismaleimide (PBMI), polyimide sulfone (PISO) or polymethacrylimide (PMI), or a similarly high-performance plastic material.

The plastic film is preferred (if used as intended during operation of the

Temperatures occurring in the connector part) are not fusible and provide an electrical

Insulation with high dielectric strength is also available with small foil thicknesses.

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. The fact that the separating layer has a small thickness (wall thickness) results in a small thermal resistance at the separating layer, so that heat is transferred efficiently to the separating layer

The busbar can be picked up and dissipated via the cooling unit.

The plastic film, especially when made from a polyimide material, should have a high, long-term dielectric strength with respect to the electrical potential between the

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

Resistance of the separating layer corresponds to the quotient of the thickness (wall thickness).

Separating layer and the specific thermal conductivity of the separating layer. So are to

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

Choose large thermal conductivity. Due to the fact that when the separating layer is designed with a plastic film, the thickness (wall thickness) can be very small, especially at

Design made of a polyimide material, the thermal resistance can be at the

Separating layer even with only medium specific thermal conductivity of the separating layer, for example

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

The separating layer formed by a plastic film can be used, for example

Surface section of the busbar can be glued or connected in some other way in order to ensure a flat, close coverage of the surface section by the separating layer.

The separating layer can have additional functional layers, for example vapor coatings, arranged on the plastic film in order to ensure heat transfer and/or the

Adapt the dielectric strength to the application.

In one embodiment, the separating layer can be formed by a heat-conducting element that is made of a material that is different from the material of the housing. The

Housing can be made of a plastic material, for example. The

In contrast, the heat-conducting element is made of a material that is different from the plastic material of the housing, for example a material containing silicone rubber.

Silicone rubber refers to elastomers that consist of silicone polymer chains with alternately arranged oxygen and silicon atoms, i.e. -Si-O-Si-

Bonds (siloxane bonds). They are therefore also called polyorganosiloxanes.

If the separating layer is designed with a (surface-extended) heat-conducting element, this can be done

Heat-conducting element, for example, have a thickness equal to or smaller than 1 mm, preferably equal to or smaller than 0.5 mm. One formed by a heat-conducting element

Separation layer can have a high specific thermal conductivity, for example up to 5 W/(mK). Such a heat-conducting element can therefore despite a comparatively large

Wall thickness has a low thermal contact resistance.

The heat-conducting element covers the surface section of the busbar over the surface and is, for example, glued to the surface section.

In one embodiment, the separating layer can, for example, be electrically insulating

Coating on the surface section, for example by painting or flocking on the surface section, may be formed.

The housing is arranged on the surface section of the busbar, for example screwed to the housing. The separating layer can be an intermediate layer between the

Take up the housing and the surface section. In order to produce a fluid-tight transition between the housing and the separating layer, a seal can be arranged between the housing and the separating layer, for example one on one of the

Surface section facing side of the housing circumferential seal, which between the

Housing and the separating layer provide a fluid-tight transition to prevent leakage

Cooling medium creates.

If the surface section of the busbar extends flat, the separating layer also extends flat to cover the surface section. However, if the surface section is curved, the separating layer is also curved. If the surface section is cylindrical, the separating layer can extend, for example, as a hose section inside the surface section or outside around the surface section.

The chamber arrangement is advantageously designed to guide the coolant flow in a meandering manner in the flow direction towards the surface section and away from the surface section in the opposite direction to the flow direction. The coolant flow therefore flows perpendicular to the

Surface section towards and also vertically away from the surface section. Because the coolant flow is directed perpendicularly to the surface section at several points, heat can be absorbed on the busbar in a distributed manner over the surface of the surface section and can therefore be dissipated from the busbar in a favorable, efficient manner.

The connector part, in particular for transmitting a charging current, has the form of a

Direct current, two plug contacts, each of which is connected to a busbar, the housing can be arranged, for example, between the surface sections and the

Direct the coolant flow back and forth between the surface sections in a meandering manner. The

Coolant flow is thus directed perpendicularly onto the surface sections of the busbars and can therefore efficiently absorb heat on the surface sections.

In one embodiment, a first chamber of the chamber arrangement is formed

To direct coolant flow in the flow direction towards the surface section. The first

Chamber can, for example, have a first flow cross section. To the first

For example, in the flow direction, the chamber is connected by a first inflow channel, which serves to direct the coolant flow from the first chamber in the flow direction

To guide surface section. The first inflow channel preferably has a flow cross section that is reduced compared to the flow cross section of the first chamber, so that the coolant flow in the inflow channel is directed towards the surface section of the busbar with a reduced flow cross section and thus increased flow velocity and hits the surface section of the busbar perpendicularly.

In one embodiment, a second chamber, which is in flow communication with the first chamber, is designed to flow coolant counter to the direction of flow

To direct surface section away. The second chamber is located downstream of the first chamber and thus receives the coolant flow from the first chamber. The second

Chamber directs the coolant flow away from the surface section of the busbar, for example towards a surface section of an adjacent, another

busbar assigned to the plug contact.

A second inflow channel can be connected to the second chamber, which serves to direct the coolant flow from the second chamber against the direction of flow, for example

Example perpendicular to the surface section of the adjacent busbar. The second inflow channel can also have a reduced flow cross section. The

Flow cross section of the second chamber can correspond, for example, to the flow cross section of the first chamber. In contrast, the second inflow channel has a reduced flow cross section, which corresponds, for example, to the flow cross section of the first inflow channel.

With the second chamber, a third chamber can be inserted in the downstream direction

There is a flow connection that is designed to (in turn) direct the coolant flow into the

Flow direction to the surface section of the busbar. To the third

A third inflow channel can be connected to the chamber in the flow direction

Coolant flow with reduced flow cross section vertically along the

Flow direction directs towards the surface section.

Further chambers can be connected to the third chamber, which are arranged in relation to one another and are in flow communication with one another in such a way that the coolant flow is guided in a meandering manner towards the surface section and away from the surface section, so that the

Coolant flow hits the surface section perpendicularly at several points and thus

Heat can be absorbed on the surface section in a favorable, efficient manner.

The surface section extends along a plane passing through a longitudinal direction and a

The height direction is spanned. The longitudinal direction and the height direction are one

Transverse direction directed vertically, which corresponds to a surface normal of the plane. The

Chambers of the chamber arrangement can be offset from one another overall along the longitudinal direction and/or along the height direction and/or along the transverse direction, with the chambers together forming a flow channel which directs the coolant flow preferably meandering perpendicularly towards the surface section and also perpendicularly away from the surface section .

In one embodiment, the chambers are arranged at two height levels. A first

Chambers can be arranged along a first direction perpendicular to the height direction

Height level can be arranged distributed to each other. In contrast, a second arrangement of chambers can be arranged distributed to one another along a second height plane which is perpendicular to the height direction and spaced apart from the first height plane. In the height-staggered arrangements of the chambers, the coolant flow is guided in a meandering manner. If the coolant flow has flowed through the chambers of a height level, the

Coolant flow flows into the chambers at the other level and is guided through these chambers in a meandering manner.

Each arrangement of chambers can have a connection for connecting one

Be assigned coolant line. In particular, the first arrangement of chambers can have a first connection for introducing the coolant flow and the second arrangement of

Chambers have a second connection for diverting the coolant flow.

The connections can each be connectable to a coolant hose, whereby the

Coolant hoses, for example, are guided in a charging cable connected to the connector part and also leading the load lines. This can be done via the charging cable

Connector part can be connected to a charging station, for example.

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

busbars. The cooling unit is between the surface sections

Busbars arranged. The housing of the cooling unit is connected to the surface sections, for example glued or screwed to the surface sections. About the

Chamber arrangement in the housing of the cooling unit, a coolant flow is preferably guided back and forth in a meandering manner between the surface sections, so that the

Coolant flow alternately perpendicular to one surface section and the other

Surface section is directed and flows back and forth between the surface sections. Heat can therefore be efficiently absorbed on both surface sections and transferred from them

Surface sections can be derived.

A charging system for charging an electric vehicle includes a connector part of the type described above. Such a charging system also includes 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 is arranged. In contrast, the mating connector part can be arranged, for example, as a charging socket on the electric vehicle and connected to the connector part

Shape of the charging plug can be connected. The charging plug can be connected to a charging station via the charging cable, for example, so that in the connected position of the

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

Electric vehicle can be transferred.

However, it is also conceivable that the connector part has a charging socket on the side

electric vehicle realized.

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

Charging currents can be used 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 exemplary embodiments shown in the figures. Show it:

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

Connecting to an electric vehicle;

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

Fig. 3A is a view of the connector part, without a housing;

3B shows another view of the arrangement according to FIG. 3A;

4A shows an arrangement of plug contacts of the plug connector part, with a cooling unit arranged between busbars of the plug contacts;

4B shows another view of the arrangement according to FIG. 4A;

5A is a side view of the arrangement according to FIG. 4A;

5B is a top view of the arrangement according to FIG. 4A;

FIG. GA is an exploded view of the arrangement according to FIG. 4A;

6B shows the exploded view from a different perspective;

7A is a partially cutaway view of the arrangement according to FIG. 4A;

Fig. 7B shows another view of the arrangement according to Fig. 7A;

Fig. 8A is a sectional view along the line I-I| according to Fig. 7B;

Fig. 8B is a sectional view along line II-II according to Fig. 7B;

8C is an enlarged view in detail A according to FIG. 8A;

9 is a view of the arrangement according to FIG. 5B, showing coolant flow through the cooling unit;

10A is an enlarged, partial view of the sectional view according to FIG. 8A, showing a coolant flow through chambers of a chamber arrangement

cooling unit; and

10B is an enlarged, partial view of the arrangement according to FIG. 8B, showing a coolant flow through chambers of the chamber arrangement

Cooling unit.

Fig. 1 shows a charging system comprising a charging station 1, which is used to charge an electrically driven 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 has one end 201 with the charging station 1 and with another end 200 with a connector part 3 in the form of a charging plug connected is.

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

Vehicle 4 can be brought into engagement. 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 quickly charge the electric vehicle 4, for example as part of a so-called

To enable rapid charging, the transmitted charging currents are large

Current strength, for example greater than 500 A, possibly even in the order of 700 A or more. Due to such high charging currents, cable 2 and also the

Charging plug 3 and the charging socket 5 lead to thermal losses, which can lead to heating of the cable 2, the charging plug 3 and the charging socket 5.

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

Example to a value of a maximum of 50 K. It follows that measures must be taken to prevent excessive heating during charging, especially when large currents are used, for example in the order of 700 A or above.

In the connector part 3 in the form of the charging plug according to FIG. 2 there are on the upper

Plug-in section 300 arranged on plug-in domes 302 plug-in contacts, for example

Transmit control signals or serve as a ground contact (connected to a ground line 22, see Fig. 3B). There are on the lower plug-in section 301

Plug domes 303, on the other hand, have plug contacts 31A, 31B arranged, which serve as load contacts for transmitting a charging current in the form of a direct current. When stuck

Connect to the assigned mating connector part 5 in the form of the charging socket

The plug contacts 31A, 31B with associated ones reach the sides of the electric vehicle 4

Counter contact elements on the side of the charging socket 5 come into electrical contact, so that a

Charging current can be transmitted from the charging station 1 to the electric vehicle 4.

In the illustrated connector part 3 in the form of the charging plug, active cooling is provided to heat, particularly in the area of the charging current

Receive and discharge plug contacts 31A, 31B in order to limit the heating on the plug connector part 3.

As can be seen from Figs. 3A, 3B to 6A, 6B, this is the case shown

Embodiment of the plug connector part 3 for each plug contact 31A, 31B

Busbar 32A, 32B assigned, via which the respective plug contacts 31A, 31B with a

Arrangement of two load lines 21A, 21B is connected.

Each plug contact 31A, 31B has a contact section 310 in the form of a socket, via which a plug-in connection is made to an associated mating contact element

Form of a contact pin of the mating connector part 5 can be produced. At an end 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 connected to the busbar 32A , 32B is contacted.

At an end 320 facing away from the end 321, each busbar 32A, 32B has one

Arrangement of load lines 21A, 21B connected. Each busbar 32A, 32B is connected to two load lines 21A, 21B, which are thus connected together to the associated plug contact 31A, 31B and provide 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 is guided and enclosed in a cable jacket 20 of the charging cable 2 (see to

Example Fig. 3A, 3B).

A cooling unit 33 is arranged between the busbars 32A, 32B, which for

To absorb and dissipate heat on the busbars 32A, 32B. Each one

Busbar 32A, 32B has a flat 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 housing 330 of the cooling unit 33 is made of an electrically insulating plastic material.

A chamber arrangement 332 is formed in the housing 330 to provide cooling, as can be seen from FIGS. 6A, 6B in conjunction with FIGS. 7A, 7B, via which a

Coolant flows through the housing 330 and at the surface portions 322 of the

Busbars 32A, 32B can be conducted.

6A, 6B, the housing 330 is open on the sides facing the surface sections 322 of the busbars 32A, 32B, so that the housing 330 extends the chambers formed in the housing 30 towards the surface sections 322 of the busbars 32A, 32B not closed.

However, between the housing 330 and the surface sections 322 of the busbars 32A, 32B, there is a separating layer 331A, 331B in the form of one on each side

Plastic film made of polyimide material is arranged, which has an intermediate layer between the

Housing 330 and the surface section 322 on the respective side of the housing 330 occupies and thus the chamber arrangement inside the housing 330 from the

Area section 322 separates.

The separating layer 331A, 331B consists of an electrically insulating material. About the

331A, 331B, the cooling medium inside the cooling unit 33 is thus electrically separated from the respective busbar 32A, 32B. A circumferential seal 333 on each side of the housing 330 ensures that coolant does not escape from the interior of the

Housing 330 can exit and come into electrical contact with the respective busbar 32A, 32B.

Coolant lines 23, 24 are connected to the cooling unit 33 and are connected together with the

Load lines 21A, 21B are guided in the charging cable 2. A first coolant line 23 is connected to a first connection 334. A second coolant line 24 is connected to an offset port 338 on the same side of the housing 330 (see in particular FIG. 6B).

The chamber arrangement 332 inside the housing 330 consists of a plurality of in

Chambers that are in fluid communication with each other, allowing coolant to flow through them

Direct cooling unit 33 between connections 334, 338. The chambers of the

Chamber arrangement 332 are arranged relative to one another in such a way that a meandering

Coolant flow is set, which meanders between the surface sections 322 of the

Busbars 32A, 32B is conducted back and forth and can therefore absorb heat on the busbars 32A, 32B.

The surface sections 322 of the busbars 32A, 32B each extend along a plane P spanned by a longitudinal direction Y are spaced apart from each other.

Two arrangements of chambers are formed in the housing 330, which are located at different height positions (viewed along the height direction Z) and are each assigned to one of the connections 334, 338. The connection 334 serves as this

Inflow for introducing a coolant flow into the arrangement of chambers located at the level of the connection 334 (in Fig. 6B corresponding to the upper arrangement of

Chambers within the housing 330). The connection 338, in contrast, serves as a drain for diverting the coolant flow from the one located at the level of the connection 338

Arrangement of chambers (in Fig. 6B corresponding to the lower arrangement of chambers within the housing 330).

Figures 8A and 8B show cross-sectional views along lines I-I and II-II of Figure 7B. The

Cross-sectional views represent cuts through the upper, first arrangement of chambers assigned to the connection 334, through which a coolant flows

Introduction flows via port 334 to then enter the lower array of chambers and flow through the lower array of chambers to port 338 and be discharged via port 338.

From the enlarged view according to FIG. 8C it can be seen that the chambers of the

Chamber arrangement 332 are each open to the surface sections 322 of the busbars 32A, 32B, but from the respectively assigned separating layer 331A, 331B

Surface section 322 of the busbar 32A, 32B are separated and thus electrically insulated.

The housing 330 is sealed in a fluid-tight manner at the transition to the separating layer 331A, 331B via the circumferential seal 333, so that coolant does not escape from the interior of the housing 330

Transition to the separating layer 331A, 331B can flow out.

9 shows the basic coolant flow F, which occurs when the coolant is passed through the chamber arrangement 332 inside the housing 330 of the cooling unit 33. It can be seen in particular that the coolant flow F meanders between the

Surface sections 322 of the busbars 32A, 32B is guided and thus alternately perpendicular to the surface section 322 of one busbar 32A and then perpendicular to the surface section 322 of the other busbar 32B. The

Coolant flow F thus alternately hits one busbar 32A and the other busbar 32B perpendicularly. This flow on the busbars 32A, 32B enables good heat transfer between the coolant flow F and the surface sections 322 of the

Busbars 32A, 32B are adjusted and heat can therefore be efficiently absorbed on the busbars 32A, 32B.

The coolant flow F, as shown in principle in FIG. 9, is passed through the chambers of the

Chamber arrangement 332 set inside the housing 330. The chambers are in flow connection with one another and are flowed through one after the other starting from the connection 334, the chambers being connected to one another and arranged relative to one another in such a way that a meandering coolant flow F results, as shown in FIG. 9.

Referring now to FIGS. 10A and 10B, the coolant flow F flows from the connection 334 first into a chambers 335-1 and is extended in the chamber 335-1 in a flow direction S towards that along a plane P

Surface section 322 of the busbar 32A guided (FIG. 10A) and then through a

Flow opening 336-1 to reach an underlying chamber 335-2 and through the

Chamber 335-2 to flow in the opposite direction to the other busbar 32B (Fig. 10B). On the side of the other busbar 32A, the coolant flow F flows through one

Flow opening 336-2 into a chamber 335-3 lying above the chamber 335-2 (FIG. 10A) in order to flow from this chamber 335-3 into a chamber 335-4 adjacent along the longitudinal direction X.

While the chambers 335-1...335-3 serve to initiate the coolant flow F from the port 334, a plurality of pairs of chambers 335-4, 335-5; 335-6, 335-7; 335-8, 335-9; 335-10, 335-11 (along the longitudinal direction

Busbars 32A, 32B located plane of symmetry) are arranged to one another and are designed and are in serial flow connection with one another.

Starting from the chamber 335-3, the coolant flow F flows into the chamber 335-4 through a flow opening 336-3 (FIG. 10A) and is distributed in the chamber 335-4 along the

Flow direction S directed towards the surface section 322 of the busbar 32A. The coolant flow F flows into a central wall 339 of the housing 330

Inflow channel 337-1, which connects to the chamber 335-4 in the flow direction S and the coolant flow F with a reduced flow cross section perpendicular to the

Surface section 322 of the busbar 32A conducts, as can be seen from FIG. 10B.

In particular, the chamber 335-4 has a flow cross section Q1 which is in the

Inflow channel 337-1 is reduced to a flow cross section Q2. This leads to one

Increasing the flow velocity in the inflow channel 337-1, so that the

Coolant flow F with increased flow velocity hits the surface section 322 of the busbar 32A perpendicularly.

The coolant flow F flows from the inflow channel 337-1 into the chamber 335-5 and passes from the chamber 335-5 via a flow opening 336-4 (FIG. 10A) into the chamber 335-6 adjacent along the longitudinal direction X. In chamber 335-6 the

Coolant flow F is now directed to the other busbar 32B, whereby the

Coolant flow F on the middle wall 339 into one adjoining the chamber 335-6

Inflow channel 337-2 flows in and is thus guided via the inflow channel 337-2 with a reduced flow cross section and thus with increased flow velocity perpendicularly onto the surface section 322 of the busbar 32B.

The coolant flow F flows from the inflow channel 337-2 into the adjoining chamber 335-7 and through the flow opening 336-5 into the chamber adjacent along the longitudinal direction X

Chamber 335-8, in which the coolant flow F is in turn directed to the busbar 32A and hits the busbar 32A perpendicularly through the adjoining inflow channel 337-3. The coolant flow F is then directed back to the busbar 32B via the adjoining chamber 335-9, the flow opening 336-6, the chamber 335-10 and the inflow channel 337-4.

From the inflow channel 337-4 (FIG. 10A), the coolant flow F enters the last chamber 335-11 of the arrangement of chambers at this height level. At the bottom of this chamber 335-11, a flow opening 336-7 is formed, through which the coolant flow F is now directed into the arrangement of chambers below, in order to flow back in a meandering manner through the chambers of this lower level and discharged via the connection 338 become.

The arrangement of the chambers 335-1 ... 335-11 creates a flow channel that allows the coolant flow F to meander back and forth between the surface sections 322 of the

Busbars 32A, 32B conducts. Because the coolant flow F is directed alternately vertically onto one busbar 32A and the other busbar 32B, heat can be efficiently absorbed and dissipated on the busbars 32A, 32B with good heat transfer coefficients.

Through the separating layers 331A, 331B between the housing 330 and the

Surface sections 322 of the busbars 32A, 32B also achieve reliable electrical insulation between the cooling unit 33 and the busbars 32A, 32B.

Because the separating layers 331A, 331B are formed, for example, by a thin one each

Plastic film, can be thin, the separating layers 331A, 331B advantageously do not significantly affect the heat transfer to the busbars 32A, 32B.

The idea underlying the invention is not related to the previous ones

Embodiments are limited, but can also be implemented in another way.

A connector part of the type in question 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. But it is also conceivable that the connector part

Transmitting a charging current is designed 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 through a section of the

Plug contact can be realized.

The surface section of the busbar can be flat. However, the surface section can also be curved. The separating layer for insulation is corresponding to the flat one

Coverage of the surface section of the busbar is flat or curved.

List of reference symbols 1 Charging station 2 Charging cable 20 Cable jacket 200, 201 End 21A, 21B Load line 22 Grounding line 23, 24 Coolant hose 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 of 322 Surface section 33 Cooling unit 330 Housing 331A, 331B Separating layer (film) 332 Chamber arrangement 333 Seal 334 Inflow 335-1...335-11 Chamber 336-1...336-7 Flow opening 337-1...337-4 Inflow channel 338 Outflow 339 Wall 4 Vehicle 5 Charging socket

E Insertion direction

F coolant flow

P level

Q1, Q2 flow cross section

S direction of flow

X longitudinal direction

Y transverse direction

Z elevation direction

Claims (22)

Patent claims 1. Connector part (3) for a charging system for charging an electric vehicle (4), with a plug-in section (301) for plug-in connection with a mating plug-in connector part (5), at least one electrical plug-in contact (31A, 31B) arranged on the plug-in section (301). 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), 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 a chamber arrangement (332) arranged in the housing (33) for guiding a coolant flow (F), the chamber arrangement (332) a plurality of chambers (335-1...335-11) which are in fluid communication with one another and at least some of the chambers (335- 1...335-11) are designed to direct a coolant flow (F) along a flow direction (S) perpendicular to the plane (P). 2. Connector part (3) according to claim 1, characterized in that the housing (330) is open on a side facing the surface section (322). 3. Connector part (3) according to claim 1 or 2, characterized by an electrically insulating separating layer (331A, 331B) arranged between the housing (330) and the surface section (322). 4. Connector part (3) according to claim 3, characterized in that the separating layer (331A, 331B) is formed by a plastic film. 5. Connector part (3) according to claim 4, characterized in that the plastic film is made of a material containing polyimide. 6. Connector part (3) according to one of claims 3 to 5, characterized in that the separating layer has a thickness equal to or less than 0.1 mm, preferably equal to or less than 0.07 mm. 7. Connector part (3) according to claim 3, characterized in that the separating layer (331A, 331B) is formed by a heat-conducting element which is made of a material different from the material of the housing (33). 8. Connector part (3) according to claim 7, characterized in that the heat-conducting element is made of a material containing silicone rubber. 9. Connector part (3) according to claim 7 or 8, characterized in that the heat-conducting element has a thickness equal to or smaller than 1 mm, preferably equal to or smaller than 0.5 mm. 10. Connector part (3) according to one of claims 3 to 9, characterized in that the cooling unit (33) has a seal (333) arranged between the housing (330) and the separating layer (331A, 331B). 11. Connector part (3) according to one of the preceding claims, characterized in that the chamber arrangement (332) is designed to meander the coolant flow (F) in the flow direction (S) towards the surface section (322) and counter to the flow direction (S). to direct away from the surface section (322). 12. Connector part (3) according to one of the preceding claims, characterized in that a first chamber (335-4) is designed to direct the coolant flow (F) in the flow direction (S) towards the surface section (322). 13. Connector part (3) according to claim 12, characterized in that on the first chamber (335-4) there is a first inflow channel (337-1) for guiding the coolant flow (F) from the first chamber (335-4) in the flow direction (S) connects to the surface section (322), the first inflow channel (337-1) having a reduced flow cross section (Q2) compared to a flow cross section (Q1) of the first chamber (335-4). 14. Connector part (3) according to claim 12 or 13, characterized in that a second chamber (335-6), which is in flow communication with the first chamber (335-4), is designed to direct the coolant flow (F) counter to the flow direction (S ) away from the surface section (322). 15. Connector part (3) according to claim 14, characterized in that on the second chamber (335-6) there is a second inflow channel (337-2) for guiding the coolant flow (F) from the second chamber (335-6) counter to the flow direction (S) connects, wherein the second inflow channel (337-2) has a reduced flow cross section (Q2) compared to a flow cross section (Q1) of the second chamber (335-6). 16. Connector part (3) according to claim 14 or 15, characterized in that a third chamber (335-8) which is in flow communication with the second chamber (335-6) is formed, the coolant flow (F) in the flow direction (S ) to the surface section (322). 17. Connector part (3) according to one of the preceding claims, characterized in that the plane is spanned by a longitudinal direction (X) and a height direction (Z) and extends perpendicular to a transverse direction (Y), at least some of the chambers (335- 1...335-11) are offset from one another along the longitudinal direction (X) and/or along the height direction (Z) and/or along the transverse direction (Y). 18. Connector part (3) according to claim 17, characterized in that a first arrangement of chambers (335-1...335-11) is arranged distributed to one another along a first height plane perpendicular to the height direction (Z) and a second arrangement of Chambers (335-1...335-11) are arranged distributed to one another along a second height plane perpendicular to the height direction (Z), spaced apart from the first height plane. 19. Connector part (3) according to claim 18, characterized in that the first arrangement of chambers (335-1...335-11) has a first connection (334) for introducing the coolant flow (F) and the second arrangement of chambers ( 335-1...335-11) have a second connection (338) for diverting the coolant flow (F). 20. Connector part (3) according to claim 19, characterized in that the first connection (334) and the second connection (338) can each be connected to a coolant hose (23, 24). 21. Plug connector part (3) according to one of the preceding claims, characterized in that the plug connector part (3) has two electrical plug contacts (31A, 31B) and two each connected to one of the plug contacts (31A, 31B), each having a surface section (322). Has busbars (32A, 32B), the Cooling unit (33) is arranged between the surface sections (322) of the busbars (32A, 32B). 22. Charging system for charging an electric vehicle (4), with a plug connector part (3) according to one of the preceding claims.