The present invention relates to a system for coupling vehicles to an electric charging station.

The system makes it possible to couple vehicles to a charging station with the purpose of transferring the electrical energy of the charging station to the vehicle or vice versa.

More particularly, the invention is intended for vehicles that have a need to store electrical energy, such as electric-powered vehicles, or vehicles that use electrical energy for cooling units or heating installations on the vehicle .

In cold regions it is known to couple vehicles to the electricity grid to keep the engine block or the oil in the gear box warm. In warm regions the use of cool stores on lorries is known for the transport of perishable goods.

All kinds of vehicles are known that use electricity from batteries or accumulators such as forklift trucks, golf carts, but mostly electric-powered or hybrid-powered cars and vans .

Several examples of these vehicles are commercially offered. After consumption of the stored energy, the storage media of such vehicle needs to be recharged, in order to have new energy for propulsion or for other applications .

Traditionally, the vehicle is charged by coupling the vehicle to a charging station via an electrical cord with plug(s), analogue to charging batteries on the public electricity grid.

Traditionally, for electric vehicles this is an electrical cord that is attached via a first plug to a wall socket of the power source, with a second plug to a socket in the vehicle that needs to be charged.

A disadvantage of such a coupling via a cord is that the driver or someone else has to insert the plug(s) and uncouple it again, and must get out of the vehicle, or request external help of others.

A second disadvantage of such a coupling via an electrical cord, is that the cord can hinder the users, because they can stumble over it, or because they forget to uncouple the cord after charging.

A third disadvantage of such cord connection is that the wire in the cord can be easily damaged by external factors such as vandalism or atmospheric circumstances in so far that the coupling is in open air, which can result in dangerous discharges or short circuits.

To provide a solution for these disadvantages, alternative systems have been developed to cordlessly couple a vehicle to a charger by means of a connector at the front of the vehicle which can make a connection with a wall socket of a charger by the movement of the vehicle itself, and without requiring any handling of the driver or another external person .

FR 2828589 describes a plug on a vehicle that can cooperate with a wall socket on a charging station. The connection between vehicle and charging station is formed in a surface parallel with the base. The wall socket on the charging station can cover a semi-circular trajectory.

US 2007/0030645 describes a connection system for the charging of a vehicle whereby the female wall socket on the charging station is suspended in a restricted movable way between springs, and the male plug on the vehicle can be connected with the female connector by moving the vehicle to the female wall socket.

CH 688599 describes a wall socket on a stationary charging station and a connector on a vehicle, whereby both are sprung and the power charging can be switched on and off by movable components.

US 2007/0126395 describes a plug on a vehicle that can make contact with a charging station, whereby the latter automatically registers the identity of the customer to send the bill for the purchased electricity.

WO 2008/147279 describes a wireless electric plug on a vehicle for the charging with electrical energy at a charging station which contains multiple movable pre- suspended pins next to each other, which can be pushed further in the connector of the charging station until a key comes into contact with one of these pins and an electrical contact is formed between the key and the charging station via guiding surfaces on the key and in the charging station. For example, five pins and one key can be used to realise the connection.

These known systems have the disadvantage that the connector on the front or back of the vehicle is not hidden and is not protected against vandalism.

These systems also have the disadvantage to only allow a limited difference in height of the plug on the vehicle above the ground surface and in this way are unsuitable for use in higher lorries as well as lower small cars with a same socket at the charging station.

The purpose of the present invention is to provide a solution for one or more of the aforementioned and other disadvantages .

To this end, the invention relates to a system for coupling electricity consuming vehicles to a source of electrical energy, the system consisting of at least an automatic fold-out and extendable connector on the vehicle provided with another five extra extendable electrodes, and a wall socket mounted to a charging station with five contact electrodes which are accessible via five vertical slots, whereby the connector is installed in the front or at the back on the vehicle and whereby this connector can make or interrupt a cordless connection with the wall socket of the charging station by the movement of the vehicle itself, and this without requiring any handling by the driver or another external person.

An advantage of this system is that the system can be fitted to the existing electricity grid at for example the home address of the owner of the vehicle, on the wall of his parking at home, but also on a wall of another location such as his work destination, a car park or a wholesaler. Another advantage of this system is that it can ensure a greater spread of distribution points such that the driver can charge his vehicle practically everywhere when parking, for example when shopping, at home or at work, in so far that these places are equipped with a suitable wall socket.

Another advantage is that this system can be simply and inexpensively installed in a general way and that it requires no specific skill of the driver to realise the coupling and possibly can be used as a universal standard and this both for higher and lower vehicles.

An added advantage is that the system is protected against external influences, such as atmospheric conditions, pollution or damage following the moving of the vehicle.

An advantage is also that the driver does not have to leave the vehicle to make or afterwards to interrupt the connection. Nor is any external personnel needed to make charging possible. Another advantage is that the connection is cordless, and that the driver cannot forget to disconnect the cord on leaving . Preferably, the fold-out connector is mounted behind the vehicle's number plate, in the front or at the back of the vehicle .

Preferably, the fold-out connector can automatically fold up from a vertical position to a horizontal position, via a control button in the vehicle or via an electronic signal. The folding out can be a folding up around a rotation axis at the top of the connector, or a folding down around a rotation axis at the bottom of the connector.

Preferably, the fold-out connector can fold out further in horizontal condition by means of a mechanical system, whereby the side provided with the contact electrodes moves horizontally in the direction of the wall socket of the charging station.

Preferably, in a next step the extended connector can itself extend the electrodes further such that only the five electrodes extend furthest to the socket with five slots to the charger.

Preferably, the extended electrodes are inserted in the five vertical slots in a plane parallel with the ground surface by moving the vehicle toward the wall socket . Preferably, the extended electrodes automatically transfer electrical energy from the charging station to a battery in the vehicle after contact with a sensor in the wall socket. Preferably, via at least one of the extended electrodes, data is transmitted from the vehicle to the charging station, such as the identification of the vehicle, and the owner, credit card or fuel card for example to which the delivered energy needs to be billed, but data of the charging station is also transmitted to the vehicle, such as the amount of delivered energy during the charge, the time and location of the charge and identification details of the charging station.

The charge can be interrupted by sending an electronic signal from the vehicle to the connected charging station or by interrupting the physical contact of the electrodes with the charging station by mechanically retracting the electrodes again. The connector itself is also mechanically retracted after the charge by a control button in the vehicle, and the connector is also folded in again to a vertical position, such that the number plate is visible again on the usual spot on the vehicle.

Consequently, the location of the plug on the vehicle is invisible, with the advantage that protection against atmospheric influences and against damage by vandalism is obtained .

Preferably, the system can be equipped with means to make blocking and unblocking of the connection between vehicle and wall socket of the charging station possible, depending on the needs of the situation. This provides the advantage that a customer cannot leave without a valid settlement, or that the system can function as parking lock at your own parking space for example.

Preferably, the vehicle is equipped with an alignment assistant that allows the car to be exactly positioned such that the connector can be slid into the socket in a sufficiently accurate way and an electric connection can be made .

This alignment assistant can take several forms, from a simple mechanical sight or a periscope mirror at a 45° angle above the wall socket to a laser or LED-assisted positioning system or a magnet-assisted system and can be provided with an automatic centering, such that in case of an imperfect positioning the deviation can be corrected. Even if the positioning is not completely perfect because the front plane of the connector is not parallel with the plane of the socket, a limited deviation is acceptable, because the socket can pivot over a limited angle around its central vertical rotation axis and can adapt to the plane of the socket.

Preferably, a distance sensor is built in which notifies the driver of the distance between the wall socket and the plug by means of an auditive signal in the vehicle.

Obviously, the vehicle can be equipped with its own electronic operating system for managing the charge, with which for example the start time and duration of the charge can be selected, and which takes into account the charging condition of the batteries.

With the intention of better showing the characteristics of the invention, a preferred embodiment of the system according to the invention to couple electricity-consuming vehicles to a source of energy is described hereinafter, by way of an example without any limiting nature, with reference to the accompanying drawings wherein:

Figure 1 schematically shows a lateral view of a system according to the invention for coupling an electricity-requiring vehicle to a charging station in coupled condition;

figure 2 shows a top view of a connector on a vehicle according to the invention in extended condition;

figure 3 shows figure 2 but now in retracted condition;

figure 4 shows figure 1 but now in uncoupled condition and with the connector folded in;

figure 5 shows a front view of the socket and periscope mirror at a charging station;

figure 6 shows a top view of a variant embodiment of a connector and a wall socket according to the invention;

figure 7 shows a side view of figure 6;

figure 8 shows a view in perspective of another variant embodiment of a connector and a wall socket according to the invention

Figure 1 shows the system 1 for coupling an electricity- requiring vehicle 2 to a charging station 3 according to the invention comprising an automatic fold-out and extendable connector 4 on the vehicle 2 which is provided with five further extendable electrodes 5 and comprising a wall socket 6 attached to a charging station 3 with five contact electrodes 7 which are accessible via five vertical slots 8.

Above the wall socket 6 a periscope mirror 9 has been provided in this case at a 45° angle directed to the driver of the vehicle 2 as an alignment assistant when positioning the connector in the wall socket. The connector 4 is located behind the vehicle's number plate 10 but is now folded out together with the number plate 10 such that the electrodes 5 of the extendable connector 4 are located in a horizontal plane. Once contact has been made between the electrodes 5 of the extendable connector 4 and the contact electrodes 7 in the wall socket 6, electrical energy can flow from the charging station 3 to the storage battery 11 of the vehicle 2. In figure 2 a top view is shown of the system's extendable connector 4 for coupling an electric-powered vehicle in fully extended condition. The connector 4 can be folded out around its horizontal rotation axis 12 and is also provided with an extendable section 13 that can be extended by means of a powered mechanism. The extendable section 13 bears the five electrodes of the connector 4, which are themselves also extendable from the extendable section 13, thus exposing the five electrodes 5 and allowing them to make an electrical contact with the wall socket 6 in which they need to be inserted. Figure 3 shows the extendable connector 4 of the system according to the invention for coupling a vehicle to a charging station 3, but now in retracted condition, whereby the five electrodes 5 are retracted into the extendable section 13 and this extendable section 13 is in turn retracted into the connector 4, which is in a horizontal condition and still needs to be folded in around its horizontal rotation axis 12 to a vertical position to make the number plate in the front of the vehicle visible again in traffic.

Figure 4 shows a lateral view of an electric-powered vehicle 2, that is uncoupled from the wall socket 6 on a charging station 3, after the connector 4 on the vehicle is fully retracted and folded into a vertical position, whereby the number plate 10 of the vehicle 2 is visible again .

Figure 5 shows a frontal view of a wall socket 6 on a wall 15 of a charging station 3, that is provided with five vertical slots 8, behind which five contact electrodes 17 are located, and which on either side are provided with flexible guides 16 which prevent damage to the wall socket 6 and the vehicle 2 to be charged. Above the wall socket 6 a periscope mirror 9 is located in this case which is directed at a 45° angle toward the driver of the vehicle 2, such that he is able to correctly judge his position in relation to the wall socket 6.

Figure 6 shows a variant embodiment 18 of a connector 4 and a wall socket 6 according to the invention whereby the connector 4 is provided with five electrodes 5 framed by two vertical protruding bodies 19 that respectively fit into five vertical slots 8 and two framing vertical voids 20 of the wall socket 6, whereby the connector 4 is brought against the wall socket 6 by driving the vehicle against it and by inserting the electrodes 5 into the slots 8 thereto intended.

Figure 7 shows a side view of the variant embodiment of figure 6, after it was protruded under the upwardly flipped licence plate 21, in order to make contact with the wall socket 6.

Figure 8 shows yet another variant embodiment 22 of a connector 4 and wall socket 6 according to the invention, whereby in this case the length of the electrodes 5 is reduced to zero, and these are reduced to conductive contact surfaces 5' in the contact surface 23 of the connector 4, and whereby also the depth of the slots 8 is reduced to zero, and the slots are replaced by conductive vertical contact surfaces 8' in the contact surface 24 of the wall socket 6.

The operation of the system according to the invention is very simple and as follows.

The wall socket 6 is provided, for example, at a parking space where it needs to be accessible for the front and back of the vehicle 2 and is connected to an electric power source, for example the public grid. Thanks to the availability of connection points to the public grid, both at home and in the public environment, such sockets can be spread on a relatively large scale. An example of such a location is at a car park of a supermarket, with the intention that customers can charge their electric-powered car 4 while their vehicle is parked and they are shopping.

To this end the customer positions his car 2 with its front opposite a wall socket 6 with the aid of an alignment assistant such as for example a periscope mirror at a 45° angle 9 above the wall socket 6 or a camera, after he has folded out or up his connector 4 which is hidden behind the number plate 10 in the front of the vehicle 2 to a horizontal position, parallel with the bottom.

He is assisted in this by the flexible guides 16 provided on either side of the socket and which prevent damage to the wall socket 6 and the vehicle 2 to be charged. In an alternative embodiment 18 he is assisted in this by the protrusions 19 on the connector 4, that fit into the voids 20 that are provided in the wall socket 6.

In a next step the five electrodes 5 themselves are extended by the connector 4 and inserted in the vertical slots 8 in the wall socket 6 whereby electrical contact is made, and the vehicle 2 can optionally be locked to the wall socket 6. After charging, the vehicle can be unlocked in a first step whereby the five electrodes 5 are retracted into the connector 4 again, or the entire connector 4 is retracted, and the electrical contact is interrupted. In an alternative embodiment the electrodes are replaced by conductive contact surfaces 5' in the contact surface 24 of the wall socket 6. In a next step the vehicle will reverse and subsequently the horizontal connector 4 will fold in or retract again, such that the number plate 10,21 is visible again for the traffic .

It is clear that in this way the connector 4 on the vehicle 2 can make or interrupt a connection with the wall socket 6 by the movement of the vehicle 2 itself and this without requiring any handling of the driver or another external person .

Means are provided in the charging station to measure the amount of transferred energy, with a view to the possible settlement of the energy cost and these means will also, for example, require an identification of the customer or his credit card, which can be provided by the vehicle via one of the extended electrodes 5 of the connector 4.

When the vehicle is parked in the wall socket 6, with the system according to the invention, the connection is automatically protected against vandalism and other external factors whereby, if desired, an additional locking in the wall socket can be provided which immobilises the vehicle and thus provides extra security against theft or unauthorised departure of the vehicle.

This additional locking can for example be operated by the user of the vehicle or by the operator of the charging station .

The charging can be interrupted by, for example, activating a button in the vehicle, whereby in a first step the electrodes of the connector are retracted again, and in a second step the vehicle is reversed away from the wall socket, and in a next step the connector is folded in again to a vertical position, whereby of course first a possible locking at the charging point needs to be unlocked.

The wall socket 6 can be located in a private parking space, but also in public buildings or parking facilities provided with the possibility of charging. The time that vehicles are parked can in this way be utilised to realise relatively long charging times, without the driver having to go to specific main distribution points of the power source .

Of the five extended electrodes one, for example, can be used as earthing, two or three for two-phase or three-phase power, and one for two-way data transmission.

Optionally, the system can be equipped with a distance sensor with an auditive signal to help the driver position his vehicle (not shown in the figures) .

Furthermore, the socket 6 and the vehicle 2, more specifically the connector 4 on the vehicle 2, can be provided with an automatic centering in relation to each other, for example because the slots 8 are provided with a conical bevelled edge and/or the electrodes of the connector 4 taper forward, such that even when the vehicle is not perfectly aligned in relation to the socket 6, there is an automatic guidance which puts the connector 4 in the right position. Additionally, the necessary degrees of freedom can be provided to this end which allow the electrodes of the connector 4 to move over a limited range in relation to their neutral position, which can be realised by springs or other flexible means.

In a variant embodiment 18 the connector is provided with five electrodes 5 framed by two vertical protruding bodies 19 that fit respectively in five vertical slots 8 framed by two vertical framing voids 20 of the wall socket 6, whereby the connector 4 is brought against the wall socket 6 by driving the vehicle against it and by introducing the electrodes 5 into the vertical slots 8 intended for them.

This variant embodiment of the connector with five electrodes 5 and two protruding bodies 19 is pushed forward after it is guided under the upwardly flipped licence plate 21, in order to make contact with the wall socket 6.

In yet another variant embodiment of a connector 4 and a wall socket 6 according to the invention, the length of the electrodes 5 in the connector 4 is reduced to zero and to conductive contact surfaces 5' in the contact surface 23 of the connector, and is also the depth of the slots reduced to zero to conductive vertical contact surfaces in the contact surface 24 of the wall socket 6 . In this case the conductive contact surfaces 5' are obviously surrounded by electrically isolating materials.

Obviously, the system for coupling electricity-requiring vehicles to a source of electrical energy according to the invention can be used in the two directions, i.e. both for charging batteries in the vehicle, and for the discharge of electricity from the batteries to the charging station or the grid to which it is connected.

Obviously, the number of electrodes does not have to be limited to five extended electrodes, but a larger or smaller number of electrodes can also be used. It is of course preferable that there is a generally accepted standard with a defined number of electrodes, such that this configuration can be generalised.

In an alternative embodiment, the connector (4) is a vertically extendable connector from the bottom of the vehicle, after which the connector can vertically extend further in the direction of a floor socket with five horizontal slots in the floor which are located in the longitudinal or movement direction of the vehicle.

The vertically extendable connector can subsequently be mounted in the front, at the back or any position under the vehicle. The positioning of the connector is subsequently done using sensors or other means such as visual, auditive or magnetic means. The GPS network can be helpful in this.

The present invention is by no means limited to the embodiments described as an example and shown in the figures, but a connection system according to the invention that can be realised in all kinds of forms and dimensions without departing from the scope of the invention, as is described in the following claims.