Method for determining a real expected charging power of a charging station

Abstract

Method and device for determining an actually expected charging power (Preal) of a charging station (LS), comprising the steps of: receiving (S1) a charging data set (LDS) from the charging station (LS) which indicates an electrical charging energy (LE) delivered by the charging station (LS) to an electric vehicle (EF) in a charging process (LV) within a charging time (LZ);Calculating (S2) an average charging power (PLV) of the charging process (LV) as a function of the charging energy (LE) specified in the received charging data set (LDS) and the charging time (LZ) specified in the received charging data set (LDS), comparing (S3) the calculated average charging power (PLV) of the charging process (LV) with a stored maximum charging power (PLV MAX) of the charging station (LS), overwriting (S4) the previously stored maximum charging power (PLV MAX) of the charging station (LS) with the calculated average charging power (PLV) if the calculated average charging power (PLV) is greater than the previously stored maximum charging power (PLV MAX), wherein a count value of an associated overwrite counter is incriminated (S5) for each overwrite performed;and determining (S7) the last overwritten maximum charging power (PLV MAX) as the actually expected charging power (Preal) of the charging station (LS) as soon as the incriminated count value of the overwrite counter reaches a predefined threshold value (SW) (S6).;

Description

[0001] The invention provides a method and a device for determining an actually expected charging power of a charging station used to charge an electric vehicle. State of the art

[0002] An electric vehicle charging station charges the vehicle by transferring electrical energy from a power source or grid to the vehicle. The electric vehicle is connected to the charging station via a charging cable and a suitable plug. Different plug types are available depending on the location and vehicle type.

[0003] DE 10 2016 202 002 A1 relates to an energy management device for controlling a charging control unit in an electric vehicle. The energy management device is configured to set a charging profile in the charging control unit for charging a battery of the electric vehicle at a charging station or in the electric vehicle itself. The charging profile is set taking into account a planned usage time of the electric vehicle and a desired state of charge of the battery, as well as a predetermined value for the maximum charging power that can be absorbed by the electric vehicle. The energy management device is coupled to a measuring unit that measures the actual charging power delivered to the electric vehicle by the charging station. The energy management device can use the value of the actual charging power to readjust the charging profile accordingly.

[0004] DE 10 2021 100 047 A1 relates to a load management method and a load management device for charging stations for electric vehicles connected to a grid connection point. The current number of charging stations at which electric vehicles are electrically charged is determined. Depending on the number of charging stations, a maximum electrical power that can be delivered at the grid connection point is determined. The electrical charging power of the charging stations at which the electric vehicles are charged is then controlled depending on the maximum electrical power that can be delivered at the grid connection point.

[0005] In applications or application programs with which a charging process for electrically recharging a vehicle battery of an electric vehicle at an electric charging station can be started, the charging power P (in kW = kilowatts) provided by the respective electric charging station is conventionally specified. The value of the charging power P specified here is static, however, and reflects the data sheet specification of the charging station. However, there are often situations in which the driver or user of an electric vehicle finds that the actually achieved charging power is below the value specified for the charging power of the charging station. This can have various causes. One possible cause is, for example, that an electric vehicle control system limits the charging power for technical reasons on the vehicle side during the charging process.However, there are also numerous cases in which the charging station LS corresponds to a nominal power P. NENN is specified, but the LS charging station does not actually reach this specified value during a charging process. This can happen, for example, if the power grid is currently or temporarily overloaded and therefore provides the LS charging station with less electrical power for a charging process. Disclosure of the invention

[0006] The present invention provides a method for determining an actually expected charging power of a charging station according to claim 1 and a device for determining an actually expected charging power of a charging station according to claim 10.

[0007] Preferred further training is the subject of the subclaims.

[0008] The invention therefore provides a method for determining an actually expected charging power of a charging station, comprising the steps: Obtaining a charging data record from the charging station indicating an electrical charging energy delivered by the charging station to an electric vehicle in a charging process within a charging time; Calculating an average charging power of the charging process as a function of the charging energy specified in the received charging data set and the charging time specified in the received charging data set; Comparing the calculated average charging power of the charging process with a stored maximum charging power of the charging station; Overwriting the previously stored maximum charging power of the charging station with the calculated average charging power if the calculated average charging power is greater than the previously stored maximum charging power, whereby a count value of an associated overwrite counter is incriminated for each overwrite performed; and Determine the last overwritten maximum charging power as the actual expected charging power of the charging station as soon as the incriminated count value of the override counter exceeds a predefined threshold.

[0009] The invention provides a method for determining and displaying an actually expected charging power of a charging station in order to give a user, when selecting the charging station, the most realistic picture possible of the charging power of the charging station that he can expect during a charging process of his electric vehicle.

[0010] In the method according to the invention, charging data records are evaluated in order to increase the accuracy of the expected charging power displayed to the user. After each charging process, the charging service provider (app provider) receives a charging data record (LDS), also known as a CDR (Charge Detail Record). The transmitted charging data record preferably contains the charging station number of the charging station in question, the charging time of the charging process carried out, and the energy charged during the charging process. From this, the average charging power can then be calculated for this single charging process. Over a large number of charging processes (carried out at different times with different vehicles), a value for the highest average charging power ever measured for the charging station in question is gradually derived.This value (“real value”) is displayed to the user in the application because it corresponds to reality and is not taken from a data sheet or other specification of the charging station.

[0011] In one possible embodiment of the method according to the invention, the determined actual expected charging power of the charging station is displayed by an application on a user interface display. This will support the user in deciding at which charging station to charge their electric vehicle.

[0012] The user interface can be provided on a portable user device, for example, a mobile phone belonging to the user or the driver of the electric vehicle. The expected charging power of the charging station displayed on the user interface provides the user with valuable information (or indication) as to whether the expected charging power of the charging station is sufficient for the desired charging process of their electric vehicle and / or how long the charging process of their electric vehicle is likely to take.

[0013] In one possible embodiment of the method according to the invention, the application displays the determined actual expected charging power of the charging station along with the nominal power of the charging station on a user interface display. This makes it easier to detect anomalies and deviations.

[0014] The charging station's rated power can be obtained from a database. A deviation between the rated power and the expected charging power can also be calculated and displayed. A significant deviation indicates a fault or a deliberate limitation of the charging station or its power supply by the operator and can trigger a fault alarm for repair or maintenance. This increases the operational reliability and availability of the charging station.

[0015] In one possible embodiment of the method according to the invention, for each charging process carried out at a charging station, a corresponding charging data record is transmitted from the charging station to a computing unit of a charging service provider, which determines the actually expected charging power of the charging station on the basis of the charging data records received from the charging station.

[0016] In one possible embodiment of the method according to the invention, each transmitted charging data record contains, in addition to the charging energy and time of the charging process, a charging station number. This allows the charging service provider's computing unit to determine and monitor the expected charging power of a plurality of charging stations in parallel.

[0017] In one possible embodiment of the method according to the invention, a date is additionally specified for the determined actual expected charging power of the charging station, indicating when the actual expected charging power of the charging station was determined. This provides the user with additional certainty as to whether the determined actual expected charging power of the charging station can still be considered current for the desired charging process.

[0018] In one possible embodiment of the method according to the invention, the actual expected charging power of the charging station is determined for each vehicle model and displayed by an application on a user interface display depending on the type of electric vehicle. This allows the user to determine the maximum charging power ever measured or determined for their vehicle model or type.

[0019] In one possible embodiment of the method according to the invention, the actual expected charging power of the charging station is determined depending on the charging conditions of the charging process and displayed by an application on a user interface display. These charging conditions relate, for example, to the time of day or another context of the charging process. For example, a charging station can limit the charging power during the day to protect the power grid from overload, whereas at night, when the power grid is not overloaded, the charging station provides the full charging power for a charging process.

[0020] In one possible embodiment of the method according to the invention, the average charging power of the charging process is calculated by dividing the charging energy specified in the received charging data set by the charging time specified in the received charging data set. This calculation can be performed quickly. In one possible embodiment of the method according to the invention, the calculated average charging power is not overwritten by new values. Instead, all average charging powers calculated over time are stored, and this total or subset is displayed to the user via a user interface, for example, via histograms or other graphical representations.

[0021] One embodiment of a histogram could be the cumulative frequency of a charging power. From such a histogram, the user can, for example, determine in what percentage of cases an average charging power x kW was actually achieved.

[0022] Another form of a graphical representation could be, for example, the course of the average charging power over time. This time can be continuous or periodic. For example, the typical weekly or nightly power curve of this charging station can be displayed.

[0023] According to a further aspect, the invention provides a device for determining an actually expected charging power of a charging station, comprising: a data interface for receiving charging data sets from at least one charging station, each charging data set indicating an electrical charging energy delivered by the respective charging station to an electric vehicle in a charging process within a charging time; and a computing unit comprising a processor configured to calculate an average charging power of the charging process as a function of the charging energy specified in a charging data set received from the charging station and the charging time specified in the received charging data set, and comprising a comparator that compares the average charging power of the charging process calculated by the processor with a maximum charging power of the charging station stored in a data memory.Wherein the previously stored maximum charging power of the charging station is overwritten by the calculated average charging power in the data memory if the average charging power calculated by the processor is greater than the previously stored maximum charging power, where with each overwrite performed, a count value of an associated overwrite counter of the computing unit is incriminated, and where the last overwritten maximum charging power is determined as the actually expected charging power of the charging station as soon as the incriminated count value of the overwrite counter reaches a predefined threshold.

[0024] In one possible embodiment of the device according to the invention, a user interface is provided for outputting the actually expected charging power of the charging station to a user of the electric vehicle.

[0025] According to a further aspect, the invention provides a computer program product with stored program instructions for carrying out the method according to the invention.

[0026] In the following, possible embodiments of the method and device according to the invention are described in more detail with reference to the attached figures.

[0027] They show: Fig. 1 is a flowchart illustrating a possible embodiment of a method according to the invention for determining an actually expected charging power of a charging station; Fig. 2 is a schematic block diagram illustrating a possible embodiment of a device according to the invention for determining an actually expected charging power of a charging station;

[0028] As in Fig. 1, a method according to the invention for determining an actually expected charging power of a charging station LS comprises several main steps S: In an optional initialization step S0 of the Fig. 1, variables can be initialized. For example, the maximum charging power P max LS a charging station LS must first be set to the initial value zero (P max LS := 0). Furthermore, the count value n of an overwrite counter ÜZ can be set to the initial value zero (n:=0). Furthermore, a calendar date value can be initialized in step S0.

[0029] In a first step S1 of the method, a computing unit RE or a data processing unit receives at least one charging data set LDS from a charging station LS. The charging data set LDS indicates the electrical charging energy LE delivered by the charging station LS to an electric vehicle EF during a charging process LV within a charging time LZ. After each completed charging process LV, the charging station LS transmits a corresponding charging data set LDS via a data network to the computing unit RE. The charging data set LDS can, for example, be transmitted from a charging point operator (CPO) of the charging station LS to an e-mobility provider (EMP). The e-mobility provider (EMP) may know the electric vehicle EF (make, model) of the specific user, as this can be part of the user / driver data.

[0030] In a further step S2, a processor of the computing unit RE calculates an average charging power P LVof the charging process LV as a function of the charging energy LE specified in the received charging data set LDS and the charging time LZ specified in the received charging data set LDS. In a preferred embodiment of the method according to the invention, the average charging power P LV of the charging process LV in step S2 by dividing the charging energy LE (in kWatt h) specified in the received charging data set LDZ by the charging time LZ specified in the received charging data set LDZ: PLV=LE / LZ

[0031] In a further step S3 of the Fig. 1, the average charging power P calculated in step S2 is calculated by a comparator KOMP LV of the charging process LV with a stored maximum charging power P max LS the LS charging station.

[0032] In a further step S4, the previously stored maximum charging power PLS MAX the charging station LS by the average charging power P calculated in step S2 LV of the charging process LV overwritten (P LS MAX := P LV ), if the comparison made by the comparator KOMP in step S3 shows that the calculated average charging power P LV is greater than the maximum charging power P previously stored for the relevant charging station LS LS MAX (P LV > P LS MAX ).

[0033] For each overwrite performed in step S4, a count value n of an associated overwrite counter ÜZ is incriminated or increased by one in step S5 (n := n +1).

[0034] The count value n+1 of the overwrite counter ÜZ incriminated in step S5 is compared with a predefined counter threshold value n-SW in a subsequent step S6.

[0035] In a further step S7 of the Fig. 1, the last overwritten maximum charging power P LS MAX (data sheet value) of the charging station LS as the actually expected charging power P real of the charging station LS as soon as the comparison in step S6 shows that the count value n+1 of the overwrite counter ÜZ incriminated in step S5 reaches or exceeds the predefined counter threshold value n-SW (n+1 >= n-SW). In reality, P real asymptotically approach a target value from below. The value n-SW can be selected individually for each charging station LS and can also be dynamically dependent on the difference P LS MAX and P realdependent. For example, if the actual value is still relatively far from the datasheet value, the value n-SW can be increased to achieve a certain degree of statistical certainty. However, if the difference between the datasheet value and the actual value is already close after just a few counting steps n, it is not necessary to wait until the original value n-SW has been reached; the procedure can be completed sooner.

[0036] In a possible embodiment of the method according to the invention, in a step S8 of the method, the determined actually expected charging power P real of the charging station LS by an application APP on a display of a user interface UI of a user terminal EG to a user N of the electric vehicle EF, as shown in Fig. 2 is shown schematically.

[0037] The user terminal EG may comprise a portable mobile radio device belonging to the user. The user terminal EG may also form part of a console of the electric vehicle EV and be permanently installed therein.

[0038] The determined actual expected charging power P real The charging station LS can also be transmitted to a control system of the electric vehicle EF via a wireless or wired communication interface.

[0039] The determined actual expected charging power P realThe charging station LS can be displayed to the user via an APP before their electric vehicle EF reaches the charging station LS. The APP can also display a distance between the current position of the electric vehicle EF and the charging station LS (e.g., 8.2 km). Furthermore, an address of the charging station LS can be displayed, and the user N can be guided to the charging station LS using a navigation device. In one possible implementation, the user N is shown various charging stations LS that are located in the vicinity of the current position of the electric vehicle EF. Preferably, their actual expected charging power P realdisplayed so that the driver or user can decide which charging station LS to drive to charge their electric vehicle EF. Other possible information that the APP application can display includes a charging tariff (euros per kWh), opening hours of the charging station LS, authentication options and / or payment options at the respective charging station LS. After reaching the selected charging station LS, the user N can start the charging process LV using the APP application by pressing a charging start button displayed on the user interface UI display after establishing a charging connection via a charging cable LK.

[0040] In a possible embodiment of the method according to the invention, the determined actually expected charging power P real of the charging station LS by the application APP together with a nominal power P NENNThe charging station's LS power is displayed on the user interface (UI) of the user device. The rated power of an LS charging station for electric vehicles (EF) is specified in kilowatts (kW) and indicates the electrical power that the LS charging station can nominally provide.

[0041] In one possible embodiment of the method according to the invention, the expected charging power is displayed via histograms or other graphical representations on the display of the user interface UI of the user terminal.

[0042] In a possible embodiment of the method according to the invention, for each charging process LV carried out at a charging station LS, a corresponding charging data set LDS is transmitted from the charging station LS to a computing unit RE of a charging service provider, which, on the basis of the charging data sets LDS successively received from the charging station LS, calculates the actually expected charging power P realof the charging station LS. The charging data (charging energy LE and charging time LZ) received from a charging station LS identified by its charging station number LS-NR can, in a possible implementation, be stored for a certain period of time and subsequently evaluated by a processor of the computing unit RE. Each charging data record LDS transmitted from a charging station LS preferably contains, in addition to the charging energy LE of the charging process LV carried out there and the charging time LZ of the charging process LV carried out, a charging station number LS-NR or another identifier LS-ID of the charging station LS.

[0043] In one possible implementation, the charging time LZ of a charging process LV is measured. Alternatively, the charging time LZ can also be determined based on the period of time during which the electric vehicle EF is connected to the charging station LS via a charging cable LK. A charging process LV is automatically terminated as soon as the vehicle battery of the connected electric vehicle EF is fully charged. If, after the vehicle battery of the electric vehicle EF is fully charged, the cable connection via the charging cable LK is not immediately disconnected by the user, the charging time LZ of the charging process LV, determined based on the existing charging cable connection, increases until the user disconnects the cable. In this case, dividing the charging energy LE of the charging process LV by the charging time LZ (LE / LZ) results in a low value for the charging power P due to the relatively long charging time LZ determined. LVof the respective charging process LV. However, with a large number of observed charging processes LV (i.e. a high number of overwrites in step S4), it also happens more often that charging processes LV are manually interrupted by the user N before the vehicle battery of the electric vehicle EF is fully charged, so that due to the relatively short charging time LZ given here, a higher value for the charging power P LV of the relevant charging process LV.

[0044] This is also due to technical reasons, as electric vehicles (EVs) typically have a higher charging power when the battery is empty than when it is almost full. This is where the vehicle's limitations come into play. For this reason, in one possible embodiment of the method according to the invention, the calculation and use of the calculation result can be made dependent on the actual charging time LZ. For example, particularly long charging processes can be excluded from consideration.

[0045] However, with an increasing number of evaluated charging processes LV at a charging station LS, the actually expected charging power P real the charging station LS is determined statistically with increasing accuracy.

[0046] In a possible embodiment of the method according to the invention, for the determined actually expected charging power P realthe charging station LS additionally specifies a date (day, time) which indicates when the actual expected charging power P real of the charging station LS by the computing unit RE. This informs the user about the current expected charging power P real the charging station LS for the charging process LV of his electric vehicle EF planned by him at this charging station LS.

[0047] In one possible embodiment of the method according to the invention, the determined actually expected charging power of the charging station LS is displayed by an application APP on a display of a user interface UI depending on a vehicle type of the electric vehicle EF.

[0048] In a further possible embodiment of the method according to the invention, the actually expected charging power P realthe charging station LS is determined depending on the charging conditions of the charging process LV and displayed by an application APP on a display of a user interface UI.

[0049] As shown schematically in Fig. As shown in Figure 2, the invention provides, according to a further aspect, a device VOR for determining an actually expected charging power of a charging station LS. The device VOR essentially comprises a data interface INT and a computing unit RE,

[0050] Via the data interface INT, the VOR device receives charging data sets LDS from at least one charging station LS that is supplied with electrical energy by a power supply network SN. Each transmitted charging data set LDS indicates the electrical charging energy LE delivered by the respective charging station LS to a connected electric vehicle EF during a charging process LV within a charging time LZ. Each charging data set LDS transmitted from a charging station LS preferably contains, in addition to the charging energy LE of the charging process LV and the charging time LZ of the charging process LV, a charging station number LS-NR or another unique identifier LS-ID of the charging station LS.

[0051] A computing unit RE of the device VOR has at least one processor or other computing unit designed to calculate an average charging power P LVof the current charging process LV based on the charging energy LE specified in a charging data set LDS received from the charging station LS and the charging time LZ specified in the received charging data set LDS. To do this, the charging energy LE (in kWh) specified in the received charging data set LDZ is divided by the charging time LZ specified in the received charging data set LDZ: PLV=LE / LZ

[0052] The computing unit RE also has a comparator KOMP, which calculates the average charging power P LV of the charging process LV with a maximum charging power P stored in a data memory DS of the computing unit RE LS MAX of the relevant charging station LS.

[0053] The previously stored maximum charging power P LS MAX of the charging station LS is determined by the calculated average charging power P LVoverwritten in the data storage DS (P LS MAX := P LV ) if the comparison made by the comparator KOMP shows that the average charging power P calculated by the processor LV is greater than the maximum charging power P previously stored for the relevant charging station LS LS MAX .

[0054] With each overwrite performed, a count value n of an associated overwrite counter ÜZ of the computing unit RE is incriminated, ie, increased by one. The last overwritten maximum charging power P LS MAX is defined as the actual expected charging power P real of the charging station LS as soon as the incriminated count value (n+1) of the overwrite counter ÜZ reaches a predefined counter threshold value n-SW.

[0055] In one possible embodiment, the counter threshold n-SW can be configured and adjusted for different use cases. This also depends on the desired achievable estimation accuracy of the actually expected charging power P real the charging station LS.

[0056] In a possible embodiment of the device VOR according to the invention, a user interface UI of a user terminal EG is provided for outputting the actually expected charging power P real the charging station LS to a user N of the electric vehicle EF, as in Fig. 2 shown.

[0057] The charging station LS and a controller of the electric vehicle EV can communicate with each other to control and monitor the charging process LV. Information such as charging power, remaining charging time, and battery status of the vehicle battery can be exchanged. The determined actual expected charging power P realof the charging station LS can also be transmitted from the computing unit RE to the control unit of the electric vehicle EF and / or to a control unit of the charging station LS.

[0058] Further embodiments are possible. In one possible embodiment, an estimation accuracy of the determined expected charging power P real of the charging station LS are calculated and displayed. The more charging processes LV are carried out and evaluated at a charging station LS, the higher the estimation accuracy of the determined actual expected charging power P real of the charging station LS. The charging data sets LDS are preferably cryptographically protected and transmitted according to a specified data transmission protocol.

[0059] Although the present invention has been fully described above with reference to the preferred embodiments, it is not limited thereto but can be modified in many ways. 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] DE 10 2016 202 002 A1

[0003] DE 10 2021 100 047 A1

[0004]

Claims

[1] Method for determining an actually expected charging power (P real ) of a charging station (LS) with the following steps: Obtaining (S1) a charging data set (LDS) from the charging station (LS) which indicates an electrical charging energy (LE) delivered by the charging station (LS) to an electric vehicle (EF) in a charging process (LV) within a charging time (LZ); Calculate (S2) an average charging power (P LV ) of the charging process (LV) depending on the charging energy (LE) specified in the received charging data set (LDS) and the charging time (LZ) specified in the received charging data set (LDS); Compare (S3) the calculated average charging power (P LV ) of the charging process (LV) with a stored maximum charging power (P LS MAX ) of the charging station (LS), Overwriting (S4) the previously stored maximum charging power (P LS MAX) of the charging station (LS) by the calculated average charging power (P LV ) if the calculated average charging power (P LV ) is greater than the previously stored maximum charging power (P LS MAX ), whereby for each overwrite performed, a count value of an associated overwrite counter (ÜZ) is incriminated (S5); Determine (S7) the last overwritten maximum charging power (P LS MAX ) than the actually expected charging power (P real ) of the charging station (LS) as soon as the incriminated count value of the overwrite counter (ÜZ) exceeds a predefined threshold value (n-SW) (S6). [2] Method according to claim 1, wherein the determined actually expected charging power (P real ) of the charging station (LS) is displayed by an application on a display of a user interface. [3] Method according to claim 2, wherein the determined actually expected charging power (Preal ) of the charging station (LS) by the application together with a nominal power (P nenn ) of the charging station (LS) is displayed on a user interface display. [4] Method according to one of the preceding claims 1 to 3, wherein for each charging process (LV) carried out at a charging station (LS), a corresponding charging data set (LDS) is transmitted from the charging station (LS) to a computing unit of a charging service provider, which, on the basis of the charging data sets (LDS) received from the charging station (LS), calculates the actually expected charging power (P real ) of the charging station (LS). [5] Method according to claim 4, wherein each transmitted charging data set (LDS) contains a charging station number (LSN) of the charging station (LS) in addition to the charging energy (LE) of the charging process (LV) and the charging time (LZ) of the charging process (LV). [6] Method according to one of the preceding claims 1 to 5, wherein for the determined actually expected charging power (P real ) of the charging station (LS) an additional date is specified, which indicates when the actual expected charging power (P real ) of the charging station (LS) has been determined. [7] Method according to one of the preceding claims 1 to 6, wherein the determined actually expected charging power (P real ) of the charging station (LS) is displayed by an application on a display of a user interface (UI) depending on a vehicle type of the electric vehicle (EV). [8] Method according to one of the preceding claims 1 to 7, wherein the actually expected charging power (P real ) of the charging station (LS) is determined depending on the charging conditions of the charging process (LV) and is displayed by an application on a display of a user interface (UI). [9] Method according to one of the preceding claims 1 to 8, wherein the average charging power (P LV ) of the charging process (LV) is calculated (S2) by dividing the transferred electrical charging energy (LE) of the charging process (LV) specified in the received charging data set (LDS) by the charging time (LZ) of the charging process (LV) specified in the received charging data set (LDS). [10] Device for determining an actually expected charging power (P real ) a charging station (LS) with: a data interface (INT) for receiving charging data sets (LDS) from at least one charging station (LS), each charging data set (LDS) indicating an electrical charging energy (LE) delivered by the respective charging station (LS) to an electric vehicle (EF) in a charging process (LV) within a charging time (LZ); and with a computing unit (RE) having a processor designed to provide an average charging power (PLV ) of the charging process (LV) as a function of the charging energy (LE) specified in a charging data set (LDS) received from the charging station (LS) and the charging time (LZ) specified in the received charging data set (LDS), and which has a comparator (KOMP) which calculates the average charging power (P LV ) of the charging process (LV) with a maximum charging power (P LS MAX ) of the charging station (LS), whereby the previously stored maximum charging power (P LS MAX ) of the charging station (LS) by the calculated average charging power (P LV ) in the data memory (DS) is overwritten if the average charging power (P LV ) is greater than the previously stored maximum charging power (P LS MAX), whereby with each overwrite performed, a count value of an associated overwrite counter (ÜZ) of the computing unit (RE) is incriminated and whereby the last overwritten maximum charging power (P LS MAX ) than the actually expected charging power (P real ) of the charging station (LS) is determined as soon as the incriminated count value of the override counter (ÜZ) reaches a predefined threshold value (SW). [11] Device according to claim 10, wherein a user interface (UI) for outputting the actually expected charging power (P real ) of the charging station (LS) to a user of the electric vehicle (EF). [12] Computer program product with stored program instructions for carrying out the method according to one of the preceding claims 1 to 9.

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