Charging plug and measuring system

Abstract

Charging connector for connecting an electrically powered vehicle (EV) via a charging cable (CC) to a charging infrastructure device (EVSE), the charging connector (PLG) comprising: - a patch panel (CP) with a plurality of electrical contacts (L1, L2, L3); - a first measuring unit (M1) for measuring at least one electrical quantity at at least two electrical contacts (L1, L2); and; - a transmission unit (TU) for transmitting at least one value of the at least one measured electrical quantity to the charging infrastructure device (EVSE).

Description

[0001] The invention relates to a charging plug for detachable connection to an electrically driven means of transport and a measuring system for determining electrical energy transferred from a charging infrastructure device.

[0002] Electrically powered means of transport, in particular vehicles powered at least partially by electrical energy or electric vehicles, have at least one rechargeable battery that must be regularly charged while the electric vehicle is in operation. An electric vehicle is typically charged at a charging infrastructure—also known in the industry as Electric Vehicle Supply Equipment, or EVSE for short—which is connected to the vehicle via a charging cable.

[0003] A measuring device provided in or associated with a charging infrastructure facility serves to record the electrical energy transferred from the charging infrastructure facility to the vehicle. The transferred electrical energy is usually billed to the owner of the electric vehicle.

[0004] DE102010045131A1 discloses a connector for an electric vehicle with at least one contact for energy transmission. Fig. 2) The plug connector is a socket located inside a vehicle for receiving a plugged-in counterpart. This plugged-in counterpart is also referred to as a charging connector. The structure of this charging connector is not discussed in detail in the citation.

[0005] DE102015204070B3 discloses an energy transmission connector designed to prevent misuse or fraudulent use. The energy transmission connector comprises a coupling element for coupling the energy transmission connector to a counter-coupling element of an energy filling station.

[0006] DE102013022087A1 discloses the integration of a control unit interposed in a charging cable into a charging plug, which can also be used to measure electrical energy. However, the disclosure primarily concerns setting a charging power between a charging station and a vehicle, without disclosing the transmission of a value of a measured electrical quantity to the charging station.

[0007] DE102013108944A1 discloses a measuring system designed either for stationary use within a building or for mobile use with an electric vehicle. A control system is designed to synchronize information about the amount of electricity fed into a power grid by a first measuring system with the amount of electricity measured by a mobile second measuring system during electric charging of an electric vehicle. The second measuring system can be integrated into a connector of a charging cable. This charging cable is, however, permanently or detachably connected to the electric vehicle. Furthermore, the mobile second measuring system is assigned to the vehicle. Due to the design, the measured charging energy is not measured at the vehicle-side connector, but rather at the connector of the charging cable remote from the vehicle.

[0008] DE102008048657A1 relates to an adapter that enables a connection for electrical consumers. The adapter allows the purchase of electrical energy via charging stations that are not specifically assigned to a buyer of the energy, i.e., do not have a meter authorized for the buyer. No measurement of at least one electrical quantity is disclosed. A metering unit is used to record transaction data, including a time measurement unit, e.g., a load profile meter. Furthermore, a measurement of a load profile during the "sale of electricity" is disclosed.

[0009] US2016 / 0347191A1 concerns a charging plug that can be directly connected to a low-voltage grid. A charging infrastructure device is therefore integrated into the plug. Due to this integration, no measured electrical value is transmitted.

[0010] According to legal metrology requirements, the transferred electrical energy must be measured at the transfer point, i.e. at the location where the electrical energy is fed into the electric vehicle or electrically powered means of transport. The transfer point would correspond to a connection between the charging cable and the means of transport to be charged. Currently, however, energy is mainly measured in a measuring device in the charging infrastructure. However, the energy measured there contains an energy component that is converted into thermal energy in an ohmic resistor in the charging cable and is therefore not transferred as electrical energy at the transfer point. In today's fast charging processes with high charging power - also known in the specialist world as high-power charging - the energy component converted into thermal energy can easily exceed two percent of the energy supplied by the charging infrastructure device.

[0011] A blanket consideration of thermal reactive energy when billing electrical energy, for example by deducting a percentage, is not permitted under calibration law, as this deduction would be based on a mere estimate, which may be subject to fluctuations due to technical conditions. In particular, billing in compliance with calibration law requires verifiable and undeniable documentation of the electrical energy transferred at a transfer point.

[0012] The object of the invention is to provide means for determining the electrical energy delivered by a charging infrastructure facility in accordance with calibration law.

[0013] The problem is solved by a charging plug with the features of patent claim 1.

[0014] The charging plug according to the invention is intended for connecting an electrically driven means of transport or electric vehicle to a charging infrastructure device via a charging cable and for this purpose comprises a plug field with a plurality of electrical contacts.

[0015] According to the invention, the charging plug comprises a first measuring unit for measuring at least one electrical quantity at at least two electrical contacts and a transmission unit for transmitting the at least one measured electrical quantity to the charging infrastructure device.

[0016] The term "comprises" means, in particular, that the measuring unit and / or the transmission unit are integrated into the housing of the charging plug. Alternatively, the measuring unit and / or the transmission unit can also be arranged in a separate housing and connected detachably, in particular pluggably, or even permanently to the housing of a conventional charging plug.

[0017] In the case of an alternating single-phase charging current or in the case of a direct current, the first electrical quantity is measured on two electrical contacts, in the case of a multi-phase charging current on at least three electrical contacts of the charging plug.

[0018] The charging plug according to the invention is based on the idea of ​​ensuring that the transferred electrical energy is determined in compliance with calibration law by measuring at least one electrical quantity at the electrical power transfer point, the respective value of which is then transmitted to the charging infrastructure. The transfer point of a charging infrastructure is located at the vehicle-side end of the charging cable or the charging plug located there, the location of the inventive measurement of at least one electrical quantity.

[0019] To determine the transferred electrical energy, instantaneous values ​​of voltage and current must be measured and integrated over time during the withdrawal period, i.e., the charging time. Determining the transferred electrical energy therefore requires the measurement of at least two electrical quantities.

[0020] Providing a complete measuring device for measuring the transferred electrical power in the charging plug is currently not entirely practical due to size and weight restrictions of the charging plug.

[0021] The invention therefore particularly includes a preferred embodiment according to which only one of the two electrical quantities to be measured to determine the electrical energy is measured at the transfer point - i.e. in the charging plug - while the other electrical quantity is measured, for example, at the connection point of the charging cable in the charging infrastructure facility.

[0022] Preferably, voltage measurements are taken at the transfer point, i.e., at the charging connector, while current measurements are taken in the charging infrastructure. This spatial distribution of both measurements has two advantages: - On the one hand, current measurement typically requires a larger measuring unit, which can be positioned more conveniently within the charging infrastructure due to the aforementioned size and weight limitations of the charging plug. In contrast, a measuring unit for voltage measurement requires significantly smaller dimensions. Furthermore, voltage measurement is subject to lower thermal dissipation and thus generates less waste heat than current measurement. Both factors speak in favor of locating the voltage measurement in the charging plug. - On the other hand, and even more importantly, the advantage of preferentially measuring voltage at the transfer point when measuring electrical quantities in a distributed manner arises from the fact that this distribution satisfies the legal metrology requirements according to which the transferred electrical energy must be measured at the transfer point. While the electrical current is locally constant within the non-branched charging circuit due to a conservation law derived from Kirchhoff's laws, the electrical voltage in the charging circuit varies depending on the measurement location. To determine the electrical power transferred at the transfer point, as required by legal metrology, the voltage measurement must be carried out at the transfer point, while the current measurement can be carried out at any location in the charging circuit.

[0023] The desired determination of the charging energy from the transmitted electrical power is carried out by integrating discrete power values ​​from the product of voltage and current measured values ​​in the charging infrastructure facility based on the transmitted value of the first electrical quantity - preferably the voltage - and the locally measured second electrical quantity, preferably the current.

[0024] The local distribution opened up according to the invention when measuring two electrical quantities in combination with a transmission of the value of one electrical quantity determined at the transfer point according to this embodiment of the invention thus fulfils the task of specifying means for a determination of the electrical energy transferred by a charging infrastructure device in accordance with calibration law.

[0025] The invention also encompasses an alternative embodiment in which both electrical quantities are measured at the transfer point—i.e., in the charging connector. This embodiment also offers the inventive advantages of a spatially distributed measurement and a spatially relocated determination of the electrical energy due to the transmission of the values ​​of the measured electrical quantity to the charging infrastructure facility, thus determining the location of the electrical energy from the transmitted values.

[0026] According to a further alternative embodiment, the electrical energy transferred is measured directly in the charging plug, with the measured, at least one electrical quantity being understood as electrical energy. The electrical energy can be measured either directly – with the first measuring unit being designed as an energy meter – or indirectly by temporal integration from the product of direct measurements of voltage and current measured values ​​at the electrical contacts of the charging plug, which are determined simultaneously or alternately by sub-measuring units integrated in the first measuring unit. The electrical energy measured in this way is transmitted to the charging infrastructure facility via the transmission unit. The control of the individual measurements and the mathematical determination of the energy are controlled and monitored by a microcontroller in the charging plug.

[0027] The problem is further solved by a measuring system having the features of a subordinate independent patent claim. According to the invention, a measuring system for determining electrical energy transferred from a charging infrastructure facility is proposed, in which a charging cable can be assigned to the charging infrastructure facility at least temporarily to form an electrical connection between a connection point of the charging cable on the charging infrastructure facility and a charging plug on an electrically driven means of transport. The measuring system comprises: - a first measuring unit arranged in the charging plug for measuring at least one first electrical quantity at at least two electrical contacts of the charging plug; - a transmission unit arranged in the charging plug for transmitting a value of the at least one first electrical quantity to the charging infrastructure device; - a second measuring unit for measuring at least one second electrical quantity at the connection point of the charging cable; and; - a determination unit for determining the electrical energy transferred by the charging infrastructure facility based on the transmitted value of the first electrical quantity and the second electrical quantity.

[0028] The measuring system according to the invention implements the above-described local distribution when measuring two electrical quantities in combination with a transmission of the value of one electrical quantity determined at the transfer point to the charging infrastructure device, where a determination unit determines the electrical energy transferred by the charging infrastructure device based on the transmitted value of the first electrical quantity and the second electrical quantity.

[0029] The problem is further solved by a method having the features of a subordinate independent patent claim. According to the invention, a method for determining the electrical energy transferred by a charging infrastructure facility is proposed, the method steps of which essentially correspond to the above description.

[0030] Further embodiments of the invention are the subject of the dependent patent claims.

[0031] According to a preferred embodiment of the invention, the electrical quantity is transmitted in the form of a digital value. The transmission unit accordingly comprises a converter for determining a digital value from the measured value of the electrical quantity. A conventional analog-to-digital converter does not necessarily have to be provided as a separate component. Alternatively, functions of an analog-to-digital converter can, for example, also be part of machine code executed on a microcontroller or implemented in the hardware of a flanking FPGA (Field Programmable Gate Array) or ASIC (Application-Specific Integrated Circuit). The microcontroller arranged in the charging plug preferably also assumes the functions of the entire transmission unit, i.e. in particular a network interface for implementing a charging infrastructure-side communication protocol.A correspondingly designed and enhanced microcontroller can also perform additional functions. In particular, volatile and non-volatile memory cells, synchronization functions, and micromechanical sensors—for example, acceleration sensors in conjunction with evaluation logic—can be additionally provided on the substrate of an enhanced microcontroller. Experts also refer to a microcontroller enhanced in this way as a system-on-silicon, or SoS.

[0032] According to a preferred embodiment of the invention, the digital value(s) of the at least one electrical quantity are transmitted together with a respective timestamp, which corresponds to an absolute or relative measurement time of the determination of the digital value(s) of the at least one electrical quantity. For this purpose, a data field consisting of digital values ​​of the at least one electrical quantity is transmitted together with the respective timestamp. Since transmitting the value to the infrastructure facility inevitably results in delays, the timestamp creates the possibility of computationally synchronizing the spatially - and thus also temporally - diverging values. To determine the transferred electrical energy, the temporally coincident instantaneous values ​​of voltage and current must be measured and temporally integrated during the withdrawal period, i.e. the charging time.

[0033] According to a preferred embodiment of the invention, the transmission of the digital value of the electrical quantity or the data field takes place according to the charging infrastructure-side communication protocol explained above.

[0034] According to a preferred embodiment of the invention, the digital value is transmitted to the charging infrastructure device in a cryptographically secured manner. The digital value(s) to be transmitted between the charging plug and the charging infrastructure device are, for example, cryptographically signed. On the charging plug side, this signature is performed, for example, by a function of the microcontroller installed in the charging plug. A cryptographic signature of the digital value to be transmitted ensures that it can no longer be edited or changed, thus protecting against manipulation. For example, a signature can be created using a key pair. A signature of the value is calculated using a private key managed by the microcontroller.A public key of the corresponding key pair is available to the recipient of the value within the charging infrastructure facility and is used to verify the private key or to verify the signature created with the private key. Such cryptographic data exchange can, of course, also be bidirectional. Cryptographic data exchange according to this design contributes, among other things, to achieving legal metrology non-repudiation.

[0035] According to one embodiment of the invention, the value is transmitted and bidirectional communication takes place between the charging plug or the electrically powered means of transport, on the one hand, and the charging infrastructure device, on the other hand, via galvanic transmission, i.e., via the charging cable. However, if the charging infrastructure device is appropriately configured with a wireless interface, such bidirectional communication with the charging plug can alternatively or additionally take place via a wireless air interface.

[0036] According to one embodiment of the invention, a charging cable is proposed, consisting of a conductor assembly for transmitting electrical charging power and / or for transmitting data, as well as a charging plug.

[0037] According to one embodiment of the invention, a measuring system is proposed in which at least the second infrastructure-side measuring unit - i.e. the second measuring unit alone or the second measuring unit and a third infrastructure-side measuring unit - is configured to measure a connection voltage and a charging current at the connection point of the charging cable, and in which the infrastructure-side determination unit is additionally configured to determine the electrical energy based on the measured connection voltage and the measured charging current. These measurements correspond to a conventional determination of the electrical energy at the connection point, which is initially objectionable under calibration law. The determination unit is additionally configured to correct the conventionally determined values ​​by correcting at least one first electrical quantity with a value measured at the transfer point, i.e. at the charging plug. A correction value consists, for example, offrom the ratio of the voltage measured at the charging plug and the connection voltage measured at the connection point. Such a combination of conventional energy determination and correction value determination based on decentralized measurement is particularly advantageous in the event of a failure of a functional unit—for example, the first measuring unit or the transmission unit—in the charging plug, since at least a less accurate energy reading can be recorded at the connection point until the charging plug is serviced.

[0038] According to one embodiment of the invention, a measuring system is proposed in which the determination unit is located outside the charging infrastructure facility, for example, in a decentralized server or in a determination unit of a billing center. For this purpose, a second transmission unit on the infrastructure side is provided in the charging infrastructure facility for transmitting at least one electrical variable to the determination unit located outside the charging infrastructure facility. Alternatively, a distributed determination can also be provided with a determination unit provided within the charging infrastructure facility and a determination unit located outside the charging infrastructure facility.

[0039] Embodiments of the charging plug and measuring system according to the invention are explained in more detail below with reference to the drawings. Identical reference numerals in different figures represent identical functional units. They show: Fig. 1 is a structural diagram illustrating an embodiment of a charging plug according to the invention; Fig. 2 shows a structural diagram illustrating a charging infrastructure in interaction with functional units according to the invention; and; Fig. 3 a block diagram showing components according to an embodiment of the charging plug according to the invention.

[0040] The figures are not necessarily drawn to scale for the sake of clarity, and in particular the proportions of the figure elements shown - both individually and in relation to each other - do not necessarily correspond to reality.

[0041] Fig. Figure 1 shows a structural diagram illustrating an embodiment of a charging plug PLG according to the invention. The charging plug has a standard connector panel CP with a plurality of electrical contacts L1, L2, L3.

[0042] The number, use and arrangement of the electrical contacts within the CP plug-in panel are sufficiently standardised. Among other things, there are CP plug-in panels according to a standard also known as Type 1 charging plug according to SAE J1772-2016-02-00, Type 2 charging plug according to DIN EN 62196-2 (VDE 0623-5-2) and Type 3 charging plug according to a proposal by a consortium called the "EV Plug Alliance".

[0043] According to the present embodiment of the invention, a first measuring unit M1 for measuring at least one electrical variable at at least two electrical contacts L1, L2 is provided within the charging plug housing. Furthermore, a transmission unit (not shown) is provided for transmitting the at least one measured electrical variable to the charging infrastructure device EVSE. The transmission unit (not shown) is Fig. 1 implemented in a microcontroller CTR in hardware and / or software.

[0044] The first measuring unit measures an electrical voltage present between the electrical contacts L1, L2. The voltage value is digitized in a converter (not shown) of the microcontroller CTR, then cryptographically secured by an encryption unit (not shown), and transmitted to the transmission unit for transmission via one or more data lines (not shown) in the charging cable CC to a charging infrastructure device at the other end of the data cable CC. The cryptographically secured digital value is transmitted via the charging cable CC according to a charging infrastructure-side communication protocol.

[0045] Optionally, a time base (not shown) is included within the CTR microcontroller, which additionally provides the voltage value with a timestamp. The voltage value and the timestamp are stored, for example, in a data field, which is then cryptographically secured and transmitted to the transmission unit for transmission to the charging infrastructure facility. The timestamp contains, for example, a time value of the measurement time.

[0046] This timestamp is preferably stored in a data set managed by the charging infrastructure facility together with the respective measured values, at least for the medium term, so that a subsequent verification of the value measured by the first measuring unit M1 in the plug is possible for the purpose of a calibration test.

[0047] Fig. Figure 3 shows a block diagram illustrating the electrical components within the charging connector. The electrical voltage present between the first contact L1 and the second contact L2 is fed to the first measuring unit M1 via two protective impedances. The measured voltage is applied to an analog-to-digital converter AD, whose right-hand output provides a digital value. This value is transmitted to the charging cable via the transmission unit TU. As mentioned above, the electrical components M1, AD, and TU can be implemented as desired within a microcontroller CTR.

[0048] Fig. Figure 2 shows a charging infrastructure with an electrically powered means of transport or electric vehicle EV to be charged and a charging infrastructure device EVSE.

[0049] The EVSE charging infrastructure device contains a power supply unit (PSU) for the standard provision, processing, and control of an electrical charging current, which will not be discussed in detail here. After the PLG charging plug is plugged into a vehicle-mounted SC socket (the drawing shows a not yet plugged-in state), and after appropriate authorization and release by the EVSE charging infrastructure device, the charging current flows from the PSU via a connection point (CON) and the CC charging cable, which is permanently or pluggably connected to the EVSE charging infrastructure device.

[0050] A standard CC charging cable comprises a cable assembly consisting of several wires for the respective charging current supply – for example, outer conductor or phase conductor, neutral conductor, protective conductor, etc. – as well as at least one signal wire. A protective conductor in the cable assembly forms a return wire for the signal wire for safety reasons. The continuity of the device earth between the signal wire and the electric vehicle (EV) is checked by the power supply unit (PSU) by measuring the current flow (the so-called "pilot signal") in the signal wire. Current may only flow into the cable assembly if the signal wire circuit is properly closed. To ensure broadband data transmission, several signal wires can be designed as twisted-pair wires with optional individual shielding of the wire pairs.In addition to transporting the electrical charging current, the CC charging cable is also usually used to exchange data and control signals related to the charging process.

[0051] The exchange of data and control signals via the CC charging cable takes place according to a communication protocol on the charging infrastructure side.

[0052] A second measuring unit M2 for measuring the charging current is provided on the charging infrastructure side of a charging current line leading from the power supply unit PSU towards the connection point CON.

[0053] The charging infrastructure device EVSE further contains a determination unit DU. The determination unit DU is configured to receive and cryptographically decrypt a data field sent by the transmission unit configured in the charging plug PLG via the data cable CC. From this data field, the determination unit DU extracts at least one value of the at least one measured electrical quantity—in the present embodiment, an electrical voltage measured at at least two electrical contacts L1, L2 on the plug-in panel CP of the charging plug PLG. A time date or timestamp is also extracted from the data field and considered as the time of the measurement when determining or calculating the electrical energy.

[0054] The electrical energy transferred by the EVSE charging infrastructure device is determined by the determination unit DU based on the voltage value between the electrical contacts L1 and L2 transmitted by the charging connector PLG and the charging current value measured locally by the second measuring unit M2. To determine the transferred electrical energy, temporally coincident instantaneous voltage and current values ​​are assigned based on their timestamp—i.e., systematically or mathematically synchronized—and integrated over time during the charging time.

[0055] If necessary, the measuring units M1, M2 involved are additionally synchronized with each other using known synchronization protocols such as NTP (Network Time Protocol) via the data connection of the charging cable CC. Alternatively, synchronization is achieved using rapid signal waveform changes in the electrical voltage, i.e. signal changes with a steep edge, which are recorded simultaneously by both measuring units M1, M2. By combining both synchronization methods, synchronization using NTP can be further refined. Furthermore, an absolute time value can be obtained from both measuring units M1, M2 via the NTP synchronization protocol. A time deviation, which arises, for example, from latency - "power line latency" - during transmission or forwarding, can be corrected by an edge of the pilot signal or control pilot signal.

[0056] Instead of a single EVSE charging infrastructure, an extended charging infrastructure (not shown) can be provided, which, for example, includes modular switch cabinets, particularly for equipping underground car parks with multiple charging stations. Multiple charging controllers can be provided, which provide groups of charging stations. A higher-level charging controller (not shown) can also communicate with multiple charging cables in an infrastructure-side communication system.

[0057] The transfer point is defined as the location where electrical energy is fed into the energy sink—here, the electrically powered vehicle or electric vehicle (EV). In the drawing, this transfer point corresponds to the charging connector (PLG) at the vehicle-side end of the charging cable (CC). In contrast, the connection point (CON) is defined as the location where electrical energy is drawn to operate or charge the energy sink—the electric vehicle (EV). In the drawing, this connection point (CN) corresponds to the connection of the connecting cable (CC) to the charging infrastructure device (EVSE).

[0058] According to one embodiment of the invention, a measuring system (not shown) is proposed in which at least the second infrastructure-side measuring unit M2 is configured to measure a connection voltage and a charging current at the connection point CON of the charging cable CC, and in which the infrastructure-side determination unit DU is additionally configured to determine the electrical energy based on the measured connection voltage and the measured charging current. "At least the second infrastructure-side measuring unit M2" is to be understood as meaning that the second measuring unit alone performs both measurements of the connection voltage and the charging current, or, alternatively, that the second measuring unit M2 and a further infrastructure-side third measuring unit (not shown) each perform one of the two measurements.

[0059] According to an embodiment (not shown), this determination unit is located outside the charging infrastructure facility, for example, in a decentralized server or in a determination unit of a billing center. For this purpose, a second transmission unit (not shown) on the infrastructure side is provided in the charging infrastructure facility (EVSE) for transmitting at least one electrical variable to the determination unit located outside the charging infrastructure facility.

[0060] These measurements at the connection point CON correspond to a conventional determination of electrical energy, which is initially objectionable under calibration law. However, the determination unit DU is also set up to correct the conventionally determined values ​​by correcting at least one first electrical quantity with a value measured at the transfer point, i.e. at the charging plug PLG. A correction value consists, for example, of the ratio of the voltage measured at the charging plug to the connection voltage measured at the connection point. Such a combination of conventional energy determination and correction value determination based on decentralized measurement is particularly advantageous in the event of a failure of a functional unit - for example the first measuring unit M1 or the transmission unit TU - in the charging plug PLG, since at least a less accurate energy value can be measured at the connection point until the charging plug PLG is serviced.Architecturally speaking, this embodiment implements a combination of a conventional, non-distributed measurement in conjunction with a decentralized correction value determination.

[0061] In summary, the charging plug according to the invention is based on the idea of ​​ensuring that the transferred electrical energy is determined in accordance with legal metrology by measuring at least one electrical quantity at the electrical power transfer point, the respective value of which is transmitted to the charging infrastructure. According to a preferred embodiment, only one of the two electrical quantities to be measured to determine the electrical energy is measured in the charging plug, while the other electrical quantity is measured, for example, at the connection point of the charging cable in the charging infrastructure facility. The spatial distribution opened up according to the invention when measuring two electrical quantities in combination with a transmission of the value of one electrical quantity determined at the transfer point ensures that the electrical energy transferred from a charging infrastructure facility is determined in accordance with legal metrology.

Claims

[1] Charging plug for connecting an electrically powered vehicle (EV) via a charging cable (CC) to a charging infrastructure device (EVSE), the charging plug (PLG) comprising: - a patch panel (CP) with a plurality of electrical contacts (L1, L2, L3); - a first measuring unit (M1) for measuring at least one electrical quantity at at least two electrical contacts (L1, L2); and; - a transmission unit (TU) for transmitting at least one value of the at least one measured electrical quantity to the charging infrastructure device (EVSE). [2] Charging plug according to claim 1, wherein the transmission unit (TU) comprises a converter (AD) for digitally transmitting the value of the electrical quantity. [3] Charging plug according to one of the preceding claims, wherein the transmission unit (TU) comprises a converter (AD) for digitally transmitting the value of the electrical quantity. [4] Charging plug according to one of the preceding claims, wherein the transmission unit (TU) comprises a time base for transmitting a time stamp with the value of the electrical quantity. [5] Charging plug according to one of the preceding claims, wherein the transmission unit (TU) is configured for transmission according to a charging infrastructure-side communication protocol. [6] Charging plug according to one of the preceding claims, wherein the transmission unit is configured for cryptographically secured transmission. [7] Charging plug according to one of the preceding claims, wherein the transmission unit is arranged for galvanic transmission via the charging cable (CC). [8] Charging cable, comprehensive, - a conductor assembly for transmitting electrical charging power and / or data; and; - a charging plug (PLG) according to one of the preceding claims. [9] Measuring system for determining electrical energy transferred from a charging infrastructure device (EVSE), wherein a charging cable (CC) for forming an electrical connection between a connection point of the charging cable (CC) on the charging infrastructure device (EVSE) and a charging plug (PLG) on an electrically driven means of transport (EV) can be assigned to the charging infrastructure device (EVSE) at least temporarily, the measuring system comprising: - a first measuring unit (M1) arranged in the charging plug (PLG) for measuring at least one first electrical variable at at least two electrical contacts (L1, L2) of the charging plug (PLG); - a transmission unit (TU) arranged in the charging plug (PLG) for transmitting a value of the at least one first electrical quantity to the charging infrastructure device (EVSE); - a second measuring unit (M2) for measuring at least one second electrical quantity at the connection point (CON) of the charging cable (CC); and; - a determination unit (DU) for determining the electrical energy delivered by the charging infrastructure device (EVSE) based on the transmitted value of the first electrical quantity and the second electrical quantity. [10] Measuring system according to claim 9, wherein - at least the second measuring unit (M2) is designed to measure a connection voltage and a charging current at the connection point (CON) of the charging cable (CC); - the determination unit (DU) is additionally equipped to determine the electrical energy based on the measured connection voltage and the measured charging current; - the determination unit (DU) is additionally set up to determine the electrical energy delivered by the charging infrastructure device (EVSE) based on the electrical energy determined from the measured connection voltage and the measured charging current. [11] Measuring system according to one of the aforementioned claims 9 and 10, characterized by , - that the destination unit (DU) is located outside the charging infrastructure facility (EVSE); - that a second transmission unit on the infrastructure side is provided in the charging infrastructure facility (EVSE) for transmitting at least one electrical variable to the determination unit (DU) located outside the charging infrastructure facility (EVSE). [12] Method for determining electrical energy transferred from a charging infrastructure device (EVSE), wherein a charging cable (CC) for forming an electrical connection between a connection point of the charging cable (CC) on the charging infrastructure device (EVSE) and a charging plug (PLG) on an electrically driven means of transport (EV) can be assigned to the charging infrastructure device (EVSE), at least temporarily, the method comprising: - measuring at least a first electrical quantity on at least two electrical contacts (L1,L2) of the charging plug (PLG); - Transmission of a value of the at least one first electrical quantity to the charging infrastructure device (EVSE); - measuring at least a second electrical quantity at the connection point of the charging cable (CC); and; - Determination of the electrical energy delivered by the charging infrastructure device (EVSE) based on the transmitted value of the first electrical quantity and the second electrical quantity. [13] Method according to claim 12, comprising method steps for operating a measuring system according to one of the preceding claims 9 to 11.

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