Device for charging electric vehicles and method

Abstract

The invention relates to a device (100) for charging electric vehicles (E1, E2), comprising: - at least one energy storage device (20) for storing electrical energy; - at least one first distributor (V1) for transmitting energy to at least one first electric vehicle (E1); - at least one further distributor (V2) for transmitting energy to at least one further electric vehicle (E2); - at least one power converter (30), wherein the device (100) is designed to provide bidirectional charging of the at least one first electric vehicle (E1) and / or the at least one further electric vehicle (E2) by setting a voltage ratio between the at least one energy storage device (20) and the at least one first distributor (V1) and / or between the at least one energy storage device (20) and the at least one further distributor (V2) by means of the at least one power converter (30), and / or by setting a voltage ratio between the at least one first distributor (V1) and the at least one further distributor (V2) by means of the at least one power converter (30), and a method.

Description

[0001] The invention relates to a device for charging electric vehicles and a method.

[0002] Charging stations are commonly used to charge electric vehicles.

[0003] From US 2023 / 0 024 900 A1, a charging station with a high-voltage battery that can be used as an intermediate storage device is known, wherein the charging station has one or more charging sockets for charging electric vehicles, wherein the power required to charge the high-voltage battery is obtained via a single-phase power connection.

[0004] The disadvantage of the state of the art is that the device can only draw power for charging the high-voltage battery and the electric vehicles via the power connection.

[0005] The technical problem is to create a device for charging electric vehicles and a method that enables a more robust energy supply.

[0006] The solution to the technical problem is achieved by the subject matter having the features of the independent claims. Further advantageous embodiments of the invention are set forth in the subclaims.

[0007] A device for charging electric vehicles is proposed, comprising: - at least one energy storage device for storing electrical energy; - at least one first distributor for transmitting energy to at least one first electric vehicle; - at least one further distributor for transmitting energy to at least one further electric vehicle; - at least one power converter, wherein the device is designed to provide bidirectional charging of the at least one first electric vehicle and / or the at least one further electric vehicle by setting a voltage ratio between the at least one energy storage device and the at least one first distributor and / or between the at least one energy storage device and the at least one further distributor by means of the at least one power converter, and / or by setting a voltage ratio between the at least one first distributor and the at least one further distributor by means of the at least one power converter.

[0008] The device enables bidirectional energy transfer between the energy storage device and the first electric vehicle. This has the advantage that, depending on demand, the first electric vehicle can charge the energy storage device of the device, or the energy storage device can charge the first electric vehicle.

[0009] The device also enables bidirectional energy transfer between the energy storage device and the other electric vehicle. This has the advantage that, depending on the need, the other electric vehicle can charge the device's energy storage device, or the energy storage device can charge the other electric vehicle.

[0010] In other words: Through bidirectional energy transfer, a partially or fully charged (first and / or subsequent) electric vehicle can be used as a donor vehicle, or the traction battery installed therein can be used as a donor battery to charge the device's energy storage unit if the energy storage unit is empty, for example. By charging the energy storage unit via electric vehicles connected to the device, the device is independent of a power supply via the power grid. This increases the robustness of the energy supply when charging electric vehicles.

[0011] Furthermore, the device enables bidirectional energy transfer between the first electric vehicle and the second electric vehicle. This has the advantage that, for example, the second electric vehicle can be charged directly via the first electric vehicle—i.e., without intermediate storage in the energy storage device—and vice versa. This extends the service life of the energy storage device by avoiding unnecessary charging cycles.

[0012] The cumulative use of several, especially all three, of the alternatives discussed above is particularly advantageous. This allows the advantages of the alternatives discussed above to be utilized synergistically as desired. Cumulative use means that the alternatives can be used at different times.

[0013] The energy storage device of the device can be designed as or comprise a lithium-ion battery, for example. The energy storage device can have a capacity ranging from 20 kWh to 1000 kWh, for example. In particular, the capacity can have a value ranging from 100 kWh to 300 kWh. This has proven particularly suitable in tests. In particular, the energy storage device can be suitable for fully charging one or more common electric vehicles due to a capacity ranging from one of the aforementioned ranges.

[0014] The first distributor and / or the further distributor can be designed, for example, as one or more electrical lines. A free end of the first distributor and / or the further distributor can be designed, for example, as a male or female CCS Type 2 Combo plug and serve for the electrical connection to the first or further electric vehicle. The free end of the first distributor and / or the further distributor can be referred to as a connection. The connection can in particular be designed as a female plug, so that, for example, a user-side charging cable can be used to connect the electric vehicle to the connection. The first distributor and / or further distributors can serve for communication between the device and the first electric vehicle and / or further electric vehicle.

[0015] The power converter can, for example, comprise components such as at least one DC / DC converter, at least one rectifier (AC / DC), at least one inverter (DC / AC) and / or at least one converter (AC / AC). Adjusting the voltage ratio by means of the at least one power converter particularly comprises converting an incoming current, an incoming voltage and / or an incoming frequency into an outgoing current, an outgoing voltage and / or an outgoing frequency. The power converter or at least one component of the power converter can also be designed to convert a plurality of incoming currents, voltages and / or frequencies into one or more outgoing currents, one or more outgoing voltages and / or one or more outgoing frequencies. The power converter can have one or more components such as, for example, at least one switch, at least one MOS-FET and / or at least one thyristor diode.However, other types of components are also possible. The components mentioned can be interconnected, in particular within the power converter, in such a way as to provide bidirectional adjustment of the voltage ratio. For bidirectional adjustment of the voltage ratio, the power converter can be designed, for example, as a so-called thyristor double bridge or comprise such a bridge. By means of the power converter or by means of at least one component of the power converter, in particular the aforementioned voltage ratios can be variably adjusted, ie the incoming variables and / or the outgoing variables can be variably adjusted, ie the set voltage ratio is, in particular, not preset.

[0016] The device comprises, in particular, at least one control device. The control device can be designed, for example, as a microcontroller or comprise such a microcontroller. The control device is designed, in particular, to control the components of the power converter and thus enable the respective voltage ratio to be adjusted by means of the power converter. In particular, the adjustment of the respective voltage ratio can be controlled, for example, depending on a criterion. This will be explained in more detail below.

[0017] In one embodiment, the at least one power converter is designed to set a voltage ratio such that the at least one energy storage device is charged via the at least one first distributor and / or via the at least one further distributor, wherein the charging of the energy storage device via the at least one first distributor and / or via the at least one further distributor takes place depending on a charging criterion. In this way, it can be ensured that the energy storage device is sufficiently charged and, for example, does not deviate from a target charge state by more than a previously known amount. The charging criterion can, for example, be designed such that the charging of the at least one energy storage device takes place via the at least one first distributor and / or via the at least one further distributor when the actual charge state of the at least one energy storage device is lower than a target charge state of the at least one energy storage device.The charging criterion can alternatively or cumulatively be configured such that the charging of the at least one energy storage device occurs via the at least one first distributor and / or via the at least one further distributor when an actual state of charge of the first and / or further electric vehicle is greater than a minimum state of charge of the at least first and / or further electric vehicle. This, of course, presupposes that an at least partially charged electric vehicle is electrically connected to the device via the first and / or further distributor and can be used as a donor vehicle.

[0018] In one embodiment, the device has at least one power connection for electrical energy transmission, wherein the at least one power converter is designed to set a voltage ratio such that a charging power that can be provided by means of the at least one power connection is combined with a charging power that can be provided by means of the at least one energy storage device to form a total charging power for charging at least one electric vehicle, wherein the charging powers are combined to form a total charging power depending on a power criterion. In this way, a portion of the total charging power can be provided via the at least one power connection and used to directly charge another electric vehicle. This is particularly advantageous if the charging power that can be provided by means of the at least one energy storage device is not sufficient, for example, to provide a target value for the total charging power.The power criterion can, for example, be configured such that the charging power of the at least one energy storage device is combined with the charging power of the at least one power connection if the actual value of the charging power available via the power connection or an actual value of the charging power available via the energy storage device is lower than a target value of the total charging power. The target value of the total power can, for example, be communicated to the device by the electric vehicle to be charged.

[0019] Power can be supplied to the device via the at least one power connection, for example, via a 230-volt and / or 400-volt power grid. Cumulatively or alternatively, the device can be charged using a renewable power source, such as a wind turbine or photovoltaic system. In particular, the power connection is designed for connection to a three-phase AC source. The connection to the three-phase AC source enables energy transmission with a higher power than, for example, a single-phase power source. The electrical power provided via the power connection can, for example, have a value in a range of 4.6 kW to 43 kW.

[0020] In one embodiment, the at least one power converter is designed to set a voltage ratio such that a charging power that can be provided by means of the at least one energy storage device is combined with a charging power that can be provided via the at least one first distributor from the at least one first electric vehicle and / or with a charging power that can be provided via the at least one further distributor from the at least one further electric vehicle to form a total charging power, wherein the combining of the charging powers to form a total charging power occurs depending on a further power criterion. In this way, a portion of the total charging power can be provided via the at least one first distributor and / or via the at least one further distributor, for example by means of an already charged electric vehicle, and can be used directly to charge another electric vehicle.This is particularly advantageous if the charging power provided by the at least one energy storage device is not sufficient, for example, to provide a target value for the total charging power. The further power criterion can, for example, be designed such that the charging powers are combined to form a total charging power if the actual value of the charging power that can be provided by the power connection or an actual value of the charging power that can be provided by the energy storage device is lower than a target value for the total charging power. The further power criterion can alternatively or cumulatively be designed such that the charging powers are combined to form a total charging power if an actual state of charge of the first electric vehicle or of the further electric vehicle is greater than a minimum state of charge of the at least first electric vehicle and / or the further electric vehicle.This, of course, requires that an at least partially charged electric vehicle is electrically connected to the device via the first and / or the additional distributor and can be used as a donor vehicle. The target value of the total power can be communicated to the device, for example, by an electric vehicle to be charged. Additionally, an actual charge level can be communicated to the device, for example, by the potential donor vehicle.

[0021] In one embodiment, the at least one power converter is designed to set a voltage ratio such that the device draws power via the at least one power connection when a further charging criterion is met. In this way, the device can be used, for example, to store power from a renewable energy source in the energy storage device or in the electric vehicles connected to the device. The further charging criterion can, for example, be designed such that the charging of the at least one energy storage device and / or the at least one first electric vehicle and / or the at least one further electric vehicle takes place via the at least one power connection when power from a renewable energy source is present at the at least one power connection. For this purpose, the device can, for example, communicate with the renewable energy source, for example via a communication device.

[0022] In particular, the at least one power converter is designed to set a voltage ratio such that the at least one energy storage device is charged via the at least one power connection, wherein the charging of the energy storage device via the power connection takes place depending on an electricity price criterion. In this way, the device can contribute to stabilizing the power grid. The electricity price criterion can, for example, be designed such that the charging of the at least one energy storage device takes place via the at least one power connection when electricity from the power grid is available at the at least one power connection and an actual electricity price is lower than a previously known maximum electricity price. Of course, electricity can be fed from the energy storage device into the power grid via the power connection depending on a further electricity price criterion.The further electricity price criterion can be designed such that the feeding of electricity from the at least one energy storage device via the at least one power connection takes place when the energy storage device has a minimum charge state and an actual electricity price is higher than a previously known minimum electricity price.

[0023] In one embodiment, the total charging power that can be provided by the device has a value of at least 150 kW. In this way, so-called high-power charging, i.e. ultra-fast charging, is enabled by the device. For example, the charging power that can be provided by the at least one energy storage device can have a value in a range from 100 kW to 150 kW. A portion of the total charging power can be provided via the power connection explained above. Alternatively or cumulatively, a portion of the total charging power can be provided via the at least one first distributor or via the at least one further distributor - e.g., through the direct bidirectional energy transfer from one distributor to another distributor explained above.

[0024] In one embodiment, the at least one first distributor is electrically connected to the at least one power converter via at least one first interface, wherein at least one connection of the at least one first distributor is at least 10 meters away from the at least one first interface and / or the at least one further distributor is electrically connected to the at least one power converter via at least one further interface, wherein at least one connection of the at least one further distributor is at least 10 meters away from the at least one further interface. In this way, the at least one first electric vehicle can be parked several meters away from the at least one further electric vehicle and still be electrically connected to the device. This is e.g.advantageous if the device is used in an underground car park and the electric vehicles cannot be parked directly next to the device.

[0025] In one embodiment, the at least one first distributor has a plurality of connections for connecting the at least one first electric vehicle and / or the at least one further distributor has a plurality of connections for connecting the at least one further electric vehicle. In this way, a plurality of first electric vehicles and / or a plurality of further electric vehicles can be electrically connected to the device at the same time. This is advantageous if the device is used, for example, in an underground car park and a separate connection for connecting to the device is provided for each parking space in the underground car park. It is also advantageous that the plurality of electric vehicles connected to the device increases the probability of a suitable donor vehicle for bidirectional charging.

[0026] In one embodiment, the at least one first distributor has at least one first switching unit, wherein the at least one first switching unit is designed to enable a connection for bidirectional charging of the at least one first electric vehicle depending on at least one first enabling criterion, and / or the at least one further distributor has at least one further switching unit, wherein the at least one further switching unit is designed to enable a connection for bidirectional charging of the at least one further electric vehicle depending on at least one further enabling criterion. In this way, it can be ensured that energy is only transferred to an electric vehicle connected to the device when the first or further enabling criterion is met.The first and / or further activation criteria can, for example, be designed such that the connection is activated when the electric vehicle connected to the respective connection is at the top of a priority assignment among the plurality of electric vehicles. The position at which an electric vehicle is in the priority assignment can, for example, be determined by a time at which the electric vehicle was connected to the respective connection. The position in the assignment can additionally depend, for example, on an actual charge level and / or target charge level and / or a planned downtime of the respective electric vehicle and / or the declaration of willingness of a user to make the respective electric vehicle available as a donor vehicle for bidirectional charging.In particular, the switching units enable direct communication between the electric vehicle connected to the activated connection and the device to function smoothly, since other electric vehicles connected to the respective distributor can only communicate with the device after the connection has been activated.

[0027] The control device explained above can in particular be designed to evaluate one or more of the criteria explained in this disclosure, e.g. the performance criterion, the further performance criterion, the charging criterion, the further charging criterion, the electricity price criterion, the activation criterion and / or the further activation criterion. For this purpose, the control device can, for example, communicate with components of the device and / or, for example, an external server in order to receive the data required to evaluate the criteria. If a criterion is met, the control device can, for example, output one or more control signals to one or more components of the device in order to bring about a technical consequence linked to the fulfillment of the criterion.

[0028] Further proposed is a method for charging electric vehicles by means of an embodiment of a device described in this disclosure, comprising: - Providing bidirectional charging of at least one first electric vehicle and / or at least one further electric vehicle, wherein a voltage ratio between at least one energy storage device and at least one first distributor is set by means of at least one power converter and / or a voltage ratio between at least one energy storage device and at least one further distributor is set, and / or a voltage ratio between the at least one first distributor and the at least one further distributor is set by means of the at least one power converter.

[0029] The technical effects and advantages cited in this disclosure for the device naturally also extend to the method, and vice versa. In particular, the device is designed to perform one, several, or all steps of the method described in this disclosure.

[0030] The invention is explained in more detail using exemplary embodiments. The figures show: Fig. 1 a schematic representation of an embodiment of a device and Fig. 2 a schematic flow diagram of an embodiment of a method.

[0031] In the following, the same reference symbols refer to elements with the same technical features.

[0032] Fig. Figure 1 shows an embodiment of a device 100 for charging electric vehicles E1, E2. The device 100 is designed to enable direct bidirectional charging between a first electric vehicle E1 and another electric vehicle E2, as well as between the electric vehicles E1, E2 and an internal energy storage device 20 of the device 100. Electrical lines for energy transmission between the components of the device 100 explained below are shown in Fig. 1 marked by solid lines.

[0033] A basic concept of the invention is that the electric vehicles E1, E2 can be used as so-called satellites of the energy storage device 20, for example, to temporarily store excess electrical energy from a renewable energy source (not shown). In this way, the storage capacity for storing electrical energy by means of the device 100 can be expanded by the electric vehicles.

[0034] A further basic idea of the invention is that the electric vehicles E1, E2 connected to the device can be used to charge the energy storage device 20 when it is empty or, if necessary, even to directly charge other electric vehicles E1, E2 - e.g. those connected to the device 100 in the meantime.

[0035] A power connection 50 of the device 100 can be used, for example, to transfer the excess energy from the renewable energy source (not shown) to the energy storage device 20. However, the power connection 50 can also be used to feed the energy temporarily stored in the energy storage device 20 or the electric vehicles E1, E2 into a power grid, for example, to stabilize the power grid.

[0036] The Fig. The energy storage device 20 shown in Figure 1 is designed as a lithium-ion battery and has a capacity of 195 kWh. The energy storage device 20 can be used to temporarily store electrical energy fed in via the power connection 50.

[0037] The device 100 further comprises a power converter 30, which serves to adjust a respective voltage ratio between the components of the device 100. The power converter 30 comprises a first bidirectional DC-DC converter 31, a further bidirectional DC-DC converter 32, and a voltage converter 33, which can convert alternating current into direct current and vice versa. Furthermore, the power converter 30 comprises a plurality of electrical switches 34 (for the sake of clarity, Fig. 1 only one switch 34 of the power converter 30 is provided with a reference symbol). All of the Fig. The switches 34 shown in Figure 1 are shown in an open state.

[0038] By means of a control device 40 designed as a microcontroller, the switches 34 of the power converter 30 can each be individually controlled via control lines and can be closed and opened as required in order to direct an energy flow within the power converter 30. For the sake of clarity, however, only one line for controlling a switch 34 is shown in Fig. 1 (indicated by a dashed line). Of course, the voltage converters 31, 32, 33 of the power converter 30 can also be controlled individually by means of the control device 40 in order to adjust a voltage ratio between an input and an output of the respective voltage converter 31, 32, 33.

[0039] The device 100 further comprises a first distributor V1, which is designed to transmit energy from the device 100 to the first electric vehicle E1 and vice versa. The first distributor V1 is electrically connected to the power converter 30 via a first interface 60. The first distributor V1 has a plurality of terminals 1, ..., 9, each of which serves to connect a first electric vehicle E1. Each of the terminals 1, ..., 9 is spaced at least 10 meters from the interface 60. Fig. 1 shows that a first electric vehicle E1 is connected to terminal 1 and to terminal 4, with the remaining terminals 2, 3, 5, ..., 9 not being occupied.

[0040] The first distributor V1 further comprises a first switching unit 80. The first switching unit 80 comprises a switch 84 for each connection 1, ... 9 and is designed to enable the connection 1, ..., 9 for bidirectional charging of the respectively connected first electric vehicle E1 in dependence on a control signal (for the sake of clarity, Fig. 1 only one switch 84 of the switching unit 80 is provided with a reference symbol). The control signal can be output, for example, via a switching line from the control device 40 to a switch 84 of the switching unit 80. For the sake of clarity, Fig. 1 only one switching line for controlling the switch 84 of the switching unit 80 is shown (marked by a dashed line).

[0041] The device 100 comprises a further distributor V2, which is designed to transmit energy from the device 100 to the further electric vehicle E2 and vice versa. The further distributor V2 is electrically connected to the power converter 30 via a first interface 70. The further distributor V2 has a plurality of connections 11, ..., 19, each of which serves to connect a further electric vehicle E2. Each of the connections 11, ..., 19 is spaced at least 10 meters from the interface 70. Fig. 1 shows that another electric vehicle E2 is connected to each of the terminals 13, 16 and 17, while the remaining terminals 11, 12, 14, 15, 18, 19 are not occupied.

[0042] The further distributor V2 further comprises a further switching unit 90. The further switching unit 90 comprises a switch 94 for each connection 11, ... 19 and is designed to enable the connection 11, ..., 19 for bidirectional charging of the respective connected further electric vehicle E2 depending on a control signal (for the sake of clarity, Fig. 1 only one switch 94 of the switching unit 90 is provided with a reference symbol). The control signal can be output, for example, via a switching line from the control device 40 to a switch 94 of the switching unit 90. For the sake of clarity, Fig. 1 only one switching line for controlling the switch 94 of the switching unit 90 is shown (marked by a dashed line).

[0043] The electric vehicles E1, E2 can, in particular, be designed as identical or different electric vehicles E1, E2. The distinction between the first electric vehicle E1 and the second electric vehicle E2 serves only to assign the respective distributor V1, V2 to which the electric vehicle E1, E2 is connected.

[0044] The Fig. The device 100 shown in Figure 1 can be installed, for example, in an underground car park of an apartment building and can offer a possibility for bidirectional charging of the electric vehicles E1, E2 via the plurality of connections 1, ..., 19 for a plurality of underground parking spaces.

[0045] Fig. 2 shows a schematic flow diagram of an embodiment of a method for charging electric vehicles E1, E2 by means of a device 100 (cf. Fig. 1).

[0046] For example, in a step S1 of the method, a voltage ratio between the energy storage device 20 and the first distributor V1 can be set by means of the DC-DC converter 31. The set voltage ratio causes an energy flow, for example, from one of the connected electric vehicles E1 to the energy storage device 20. The energy storage device 20 is thus charged by means of a donor vehicle connected to the connection 1 (see FIG. Fig. 1). The device 100 can determine the respective donor vehicle, for example, depending on the actual charge state of the first and / or further electric vehicle E1, E2.

[0047] In a further step S2, for example—simultaneously or with a time delay to step S1—a voltage ratio between the energy storage device 20 and the further distributor V2 can be set by means of the DC-DC converter 32. The set voltage ratio causes an energy flow from the energy storage device 20, for example, to the further electric vehicle E2. The further electric vehicle E2 is thus supplied with energy by the energy storage device 20 charged in the first step S1 (see. Fig. 1).

[0048] In a further step S3, a voltage ratio between the first distributor V1 and the further distributor V2 can be set by means of the DC-DC converter 31 and the DC-DC converter 32. The set voltage ratio causes an energy flow, for example, from the first electric vehicle E1 (connected to connection 4) to the further electric vehicle E2 (connected to connection 13). The further electric vehicle E2 connected to connection 13 is thus charged by means of the first electric vehicle E1 connected to connection 4, without using the energy storage device 20 as an intermediate storage device (cf. Fig. 1).

[0049] In a further step S4, a voltage ratio can be set between the power connection 50 and the first distributor V1 by means of the voltage converter 33 and the DC-DC converter 31. At the same time, a further voltage ratio between the energy storage device 20 and the first distributor V1 can be set by means of the DC-DC converter 31. The set voltage ratios have the effect that the charging power that can be provided by means of the power connection 50 is combined with the charging power that can be provided by the energy storage device 20 to form a total charging power, for example for charging the first electric vehicle E1 connected to connection 4, and in this way the total charging power is increased. This shortens the charging time required to charge the first electric vehicle E1 (cf. Fig. 1).

[0050] In a further step S5, a voltage ratio can be set between the first distributor V1 and the further distributor V2 by means of the DC-DC converter 31 and the DC-DC converter 32. At the same time, a further voltage ratio between the energy storage device 20 and the further distributor V2 can be set by means of the DC-DC converter 32. The set voltage ratios have the effect that the charging power that can be provided by the energy storage device 20 is combined with the charging power that can be provided by the first electric vehicle E1, connected, for example, to connection 1, to form a total charging power, for example for charging the further electric vehicle E2 connected to connection 17, and in this way the total charging power is increased. This shortens the charging time required to charge the further electric vehicle E2 (cf. Fig. 1).

[0051] In a further step S6, in addition to the voltage ratios set in step S5, a third voltage ratio can be set between the power connection 50 and the further distributor V2 by means of the voltage converter 33 and the DC-DC converter 32. The three set voltage ratios have the effect that the charging power that can be provided by the energy storage device 20 is combined with the charging power that can be provided by the first electric vehicle E1, connected, for example, to connection 1, and with the charging power that can be provided by the power connection 50 to form a total charging power for charging the further electric vehicle E2, connected, for example, to connection 17, and in this way the total charging power is increased again. This further shortens the charging time required compared to step S5 (cf. Fig. 1).

[0052] In particular, in a further step (in Fig. 2 not shown) by means of the DC-DC converter 31 and by means of the voltage converter 33 between the first distributor V1 and the power connection 50. The set voltage ratio has the effect that electrical energy absorbed by the first electric vehicle E1 by means of the first distributor V1 is conducted to the power connection 50 and in this way electrical energy from the electric vehicle E1 is fed, for example, into the power grid. This protects the energy storage device 20 and serves to stabilize the power grid. Of course, energy can also be conducted from the further electric vehicle E2 to the power connection 50 and fed into the power grid via the further distributor V2 (cf. Fig. 1).

[0053] To control the energy flow within the device 100 for each of the explained steps S1, S2, S3, S4, S5, S6 or other scenarios described in this disclosure, the controller 40 can control the switches 34, 84, 94 and turn them on or off as needed to achieve the described technical effect. List of reference symbols 1, ..., 9 connection 11, ...,19 connection 20 energy storage units 30 power converters 31 first DC-DC converter 32 additional DC-DC converters 33 inverters and rectifiers 34 switches 40 Control device 50 power connection 60 first interface 70 additional interfaces 80 first switching unit 84 switches 90 additional switching unit 94 switches 100 device E1 first electric vehicle E2 another electric vehicle S1 step S2 step S3 step S4 Step S5 Step S6 Step V1 first distributor V2 additional distributor QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 2023 / 0 024 900 A1

[0003]

Claims

[1] Device (100) for charging electric vehicles (E1, E2), comprising: - at least one energy storage device (20) for storing electrical energy; - at least one first distributor (V1) for transmitting energy to at least one first electric vehicle (E1); - at least one further distributor (V2) for transmitting energy to at least one further electric vehicle (E2); - at least one power converter (30), wherein the device (100) is designed to provide bidirectional charging of the at least one first electric vehicle (E1) and / or the at least one further electric vehicle (E2) by setting a voltage ratio between the at least one energy storage device (20) and the at least one first distributor (V1) and / or between the at least one energy storage device (20) and the at least one further distributor (V2) by means of the at least one power converter (30), and / or by setting a voltage ratio between the at least one first distributor (V1) and the at least one further distributor (V2) by means of the at least one power converter (30). [2] Device (100) according to claim 1, characterized by in that the at least one power converter (30) is designed to set a voltage ratio such that the at least one energy store (20) is charged via the at least one first distributor (V1) and / or via the at least one further distributor (V2), wherein the charging of the energy store (20) takes place via the at least one first distributor (V1) and / or via the at least one further distributor (V2) depending on a charging criterion. [3] Device (100) according to one of the preceding claims, characterized byin that the device (100) has at least one power connection (50) for transmitting electrical energy, wherein the at least one power converter (30) is designed to set a voltage ratio such that a charging power that can be provided by means of the at least one power connection (50) is combined with a charging power that can be provided by means of the at least one energy store (20) to form a total charging power for charging at least one electric vehicle (E1, E2), wherein the combining of the charging powers to form a total charging power takes place as a function of a power criterion. [4] Device according to one of the preceding claims, characterized by that the at least one power converter (30) is designed to set a voltage ratio such that the device (100) receives current via the at least one power connection (50) when a further charging criterion is met. [5] Device (100) according to one of the preceding claims, characterized by in that the at least one power converter (30) is designed to set a voltage ratio such that a charging power that can be provided by means of the at least one energy store (20) is combined with a charging power that can be provided via the at least one first distributor (V1) and / or with a charging power that can be provided via the at least one further distributor (V2) to form a total charging power, wherein the combining of the charging powers to form a total charging power takes place as a function of a further power criterion. [6] Device (100) according to one of the preceding claims, characterized by that the total charging power that can be provided by means of the device (100) has a value of at least 150 kW. [7] Device (100) according to one of the preceding claims, characterized bythat the at least one first distributor (V1) is electrically connected to the at least one power converter (30) via at least one first interface (60), wherein at least one connection (1, ..., 9) of the at least one first distributor (V1) is at least 10 meters away from the at least one first interface (60), and / or the at least one further distributor (V2) is electrically connected to the at least one power converter (30) via at least one further interface (70), wherein at least one connection (11, ..., 19) of the at least one further distributor (V2) is at least 10 meters away from the at least one further interface (70). [8] Device (100) according to one of the preceding claims, characterized bythat the at least one first distributor (V1) has a plurality of connections (1, ..., 9) for connecting the at least one first electric vehicle (E1) and / or the at least one further distributor (V2) has a plurality of connections (11, ..., 19) for connecting the at least one further electric vehicle (E2). [9] Device (100) according to one of the preceding claims, characterized byin that the at least one first distributor (V1) has at least one first switching unit (80), wherein the at least one first switching unit (80) is designed to enable a connection (1, ..., 9) for bidirectional charging of the at least one first electric vehicle (E1) depending on at least one first enabling criterion, and / or the at least one further distributor (V2) has at least one further switching unit (90), wherein the at least one further switching unit (90) is designed to enable a connection (11, ..., 19) for bidirectional charging of the at least one further electric vehicle (E2) depending on at least one further enabling criterion. [10] Method for charging electric vehicles (E1, E2) by means of a device (100) according to one of claims 1 to 9, comprising: - Providing (S1) a bidirectional charging of at least one first electric vehicle (E1) and / or at least one further electric vehicle (E2), wherein by means of at least one power converter (30) a voltage ratio between at least one energy storage device (20) and at least one first distributor (V1) and / or a voltage ratio between at least one energy storage device (20) and at least one further distributor (V2) is set, and / or by means of the at least one power converter (30) a voltage ratio between the at least one first distributor (V1) and the at least one further distributor (V2) is set.

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