Power transmission control device

Abstract

To provide a power transmission control device that can prevent the occurrence of a case in which power transmission between an electric vehicle having a plurality of pieces of contract certificate information and a power station becomes impossible.SOLUTION: A charging control device 100 (power transmission control device) includes a storage device 153 (recording unit) that records a plurality of digital certificates 154 (contract certificate information) relating to charging (power transmission). The charging control device 100 also includes a processor 151 (selection unit) (acquisition unit) that selects a digital certificate that is suitable for a charging station 300 from a plurality of digital certificates (153a, 153b) based on predetermined information (identification information or history information) relating to the charging station 300 (power station) where the charging is performed between it and an electric vehicle 200. A communication device 140 (acquisition unit) (sending unit) sends the selected digital certificate to the charging station 300.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a power transmission control device. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2022-061185 (Patent Document 1) discloses a vehicle equipped with an in-vehicle processing unit that acquires charging side information including identification information associated with a charging device and address information of a server device that performs charging authentication. When the charging side information is acquired by the vehicle, a connection is established between the vehicle side authentication unit (user terminal) and the server device, and authentication processing is started. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-061185 Summary of the Invention [Problem to be solved by the invention]

[0004] Although not specified in the above Patent Document 1, there are cases where charging processing between the vehicle and the charging equipment is executed by transmitting appropriate contract certificate information from among multiple pieces of contract certificate information stored in the vehicle to the charging equipment. In other words, if inappropriate contract certificate information is transmitted from the vehicle (electric vehicle) to the charging equipment (power stand), charging processing (power transmission) cannot be executed.

[0005] The present disclosure has been made to solve the above-mentioned problems, and its purpose is to provide a power transmission control device that can prevent cases where power transmission between an electric vehicle having multiple contract certificate information and a power stand becomes impossible. [Means for solving the problem]

[0006] A power transmission control device according to one aspect of the present disclosure is a power transmission control device that controls power transmission including at least one of charging and discharging of a secondary battery of an electric vehicle, and includes a recording unit that records multiple contract certificate information related to power transmission, an acquisition unit that acquires specified information related to a power station where power transmission is performed between the electric vehicle, a selection unit that selects contract certificate information that is compatible with the power station from the multiple contract certificate information based on the acquired specified information, and a transmission unit that transmits the selected contract certificate information to the power station.

[0007] In the power transmission control device according to one aspect of the present disclosure, as described above, contract certificate information that is suitable for the power stand is selected from the multiple contract certificate information, and the selected contract certificate information is transmitted to the power stand. This makes it possible to prevent contract certificate information that is not suitable for the power stand from being transmitted to the power stand. As a result, it is possible to prevent the occurrence of a case in which power transmission between an electric vehicle having multiple contract certificate information and the power stand becomes impossible.

[0008] In the power transmission control device according to the above aspect, preferably, when a power stand is set as a destination, the acquisition unit acquires, as the predetermined information, identification information of the power stand set as the destination. The selection unit selects contract certificate information that matches the power stand set as the destination based on the identification information. With this configuration, it is possible to prevent cases in which power transmission cannot be performed at the power stand set as the destination.

[0009] In the power transmission control device according to the above aspect, preferably, when the distance between the electric vehicle and the power station becomes within a predetermined distance, the acquisition unit acquires, as the predetermined information, identification information of the power station located within the predetermined distance. The selection unit selects contract certificate information that matches the power station located within the predetermined distance based on the identification information. With this configuration, it is possible to prevent cases in which power transmission cannot be performed at the power station located within the predetermined distance.

[0010] In the power transmission control device according to the above aspect, preferably, when the distance between the electric vehicle and the power station becomes within a predetermined distance, the acquisition unit acquires, as the predetermined information, history information of past power transmissions at the power station located within the predetermined distance. The selection unit selects contract certificate information that matches the power station located within the predetermined distance based on the history information. With this configuration, even if there is no identification information of the power station, by using the history information, it is possible to prevent the occurrence of a case where power transmission cannot be performed at the power station located within the predetermined distance.

[0011] In the power transmission control device according to the above aspect, preferably, when the distance between the electric vehicle and the power station is within a predetermined distance and the identification information of the power station located within the predetermined distance can be acquired by the acquisition unit in a situation where the power station is not set as the destination, the selection unit selects contract certificate information suitable for the power station located within the predetermined distance based on the identification information. Also, when the distance between the electric vehicle and the power station is within a predetermined distance and the identification information cannot be acquired by the acquisition unit in a situation where the power station is not set as the destination, the selection unit selects contract certificate information suitable for the power station located within the predetermined distance using history information of past power transmission at the power station located within the predetermined distance. With this configuration, even when the power station is not set as the destination, it is possible to prevent the occurrence of a case where power transmission cannot be performed at the power station located within the predetermined distance by using the identification information or the history information.

[0012] In the power transmission control device that selects the contract certificate information based on the identification information, the identification information preferably includes information on the electric power company with which the power stand is affiliated. With this configuration, it is possible to transmit, to the power stand, contract certificate information that is compatible with the electric power company with which the power stand is affiliated.

[0013] According to the present disclosure, it is possible to prevent the occurrence of a case in which power transmission between an electric vehicle having multiple pieces of contract certificate information and a power station becomes impossible. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram illustrating an electric vehicle equipped with a charge control device according to an embodiment, a charging stand, and a server. [Diagram 2] FIG. 2 is a diagram showing an example of the contents of a digital certificate. [Diagram 3] FIG. 2 is a diagram showing a charging station and an electric power company. [Figure 4] FIG. 4 is a sequence diagram showing control of the charging system according to one embodiment. [Diagram 5] FIG. 1 is a first diagram showing a screen of an HMI device according to an embodiment. [Figure 6] FIG. 2 is a second diagram showing a screen of an HMI device according to an embodiment. [Figure 7] FIG. 5 is a sequence diagram showing details of step S30 in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference characters, and the description thereof will not be repeated.

[0016] 1 is a diagram illustrating a schematic overall configuration of a charging system 1 according to this embodiment. The charging system 1 includes an electric vehicle 200, a charging stand 300, and a server 400. The charging stand 300 is an example of a "power stand" in the present disclosure.

[0017] Electrically powered vehicle 200 is configured to perform PnC charging with charging stand 300 (charging in which user authentication is performed in response to connection of a charging connector to the vehicle).

[0018] The server 400 manages external charging (PnC charging) between the electric vehicle 200 and the charging stand 300. The server 400 communicates with each of the electric vehicle 200 and the charging stand 300. Note that the external charging (PnC charging) is an example of "power transmission" in the present disclosure.

[0019] The electric vehicle 200 includes a battery 210 that stores electric power for traveling. The electric vehicle 200 is configured to be able to travel using the electric power stored in the battery 210. In this embodiment, the electric vehicle 200 is an electric vehicle (BEV) that does not include an engine (internal combustion engine). The electric vehicle 200 may also be a hybrid vehicle (HEV) that includes an engine, or a plug-in hybrid vehicle (PHEV). The battery 210 is an example of a "secondary battery" in the present disclosure.

[0020] The electric vehicle 200 further includes a traveling drive unit 110, an HMI (Human Machine Interface) device 120, a monitoring module 130, a communication device 140, a control device (ECU: Electronic Control Unit) 150, an inlet 160, a GPS module 170, and drive wheels W.

[0021] The electric vehicle 200 is also equipped with a charging control device 100 that controls charging of the battery 210. The charging control device 100 includes a monitoring module 130, a communication device 140, and an ECU 150. The charging control device 100 is an example of a "power transmission control device" of the present disclosure.

[0022] The traveling drive unit 110 includes a power control unit (PCU) and a motor generator (MG) (not shown), and is configured to make the electric vehicle 200 travel using electric power stored in the battery 210.

[0023] The HMI device 120 includes an input device and a display device, and may include a touch panel display.

[0024] The monitoring module 130 includes various sensors that detect the state (for example, voltage, current, and temperature) of the battery 210, and outputs the detection results to the ECU 150. The monitoring module 130 may be a BMS (Battery Management System) that further has a SOC (State Of Charge) estimation function, a SOH (State of Health) estimation function, a cell voltage equalization function, a diagnosis function, and a communication function in addition to the above sensor functions.

[0025] The communication device 140 communicates with each of the charging stand 300 and the server 400. The communication device 140 may include a DCM (Data Communication Module) or a communication I / F compatible with 5G (fifth generation mobile communication system). The communication device 140 is an example of an "acquisition unit" and a "transmission unit" of the present disclosure.

[0026] The ECU 150 is configured to perform charging control and discharging control of the battery 210. The ECU 150 includes a processor 151, a RAM (Random Access Memory) 152, and a storage device 153. The processor 151 is an example of a "selecting unit" and an "acquiring unit" in the present disclosure. The storage device 153 is an example of a "recording unit" in the present disclosure.

[0027] The ECU 150 may be a computer. The processor 151 may be a CPU (Central Processing Unit). The RAM 152 functions as a working memory for temporarily storing data to be processed by the processor 151.

[0028] The storage device 153 is configured to be able to save stored information. In addition to programs, information used in the programs (for example, maps, formulas, and various parameters) is stored in the storage device 153. The processor 151 executes the programs stored in the storage device 153, whereby various controls in the ECU 150 are performed.

[0029] The storage device 153 stores a digital certificate 154. The digital certificate 154 includes a digital certificate 154a and a digital certificate 154b. The ECU 150 (processor 151) can execute a process of writing the digital certificate 154 to the storage device 153. Here, the digital certificate 154 includes, for example, an OEM (Original Equipment Manufacturer) certificate and a charging contract certificate. Note that the charging contract certificate certifies the contents of a contract concluded between a mobility operator (MO) (electric power company) that provides a charging service and a user of the electric vehicle 200. Note that the digital certificates (154, 154a, 154b) are examples of "contract certificate information" in the present disclosure.

[0030] In the example shown in FIG. 2, the digital certificate 154 includes information on a charging fee determined by a time and an amount of charging energy. FIG. 2 shows an example of information included in the digital certificate 154a. The digital certificate 154a includes information indicating that the upper limit of the amount of charging energy is 15 kW from 0:00 a.m. to 1:00 a.m., and the charging fee is 0.25 EUR / kWh. The digital certificate 154a also includes information indicating that the charging fee is 0.30 EUR / kWh for an amount of charging energy up to 10 kW, the charging fee is 0.20 EUR / kWh for an amount of charging energy between 1:00 a.m. and 2:00 a.m., and the charging fee is 0.10 EUR / kWh for an amount of charging energy between 20 kW and 30 kWh. Note that the information included in the digital certificate 154a is not limited to the example shown in FIG. 2.

[0031] Moreover, the digital certificate 154 includes information associated with the fee system of Fig. 2. The above information includes, for example, vehicle information (VIN) of the electric vehicle 200, personal information of the user of the electric vehicle 200, and card information used to pay the charging fee. Furthermore, an expiration date is set in the digital certificate 154. The ECU 150 controls charging authenticated by the digital certificate 154. If the digital certificate 154 has expired, it is necessary to update the digital certificate 154.

[0032] Moreover, digital certificate 154 includes information on the power company that issued it. Specifically, digital certificate 154a includes information indicating that it was issued by power company 310A (see FIG. 3). Moreover, digital certificate 154b includes information indicating that it was issued by power company 310B (see FIG. 3). In this embodiment, charging stand 300A and charging stand 300B (both see FIG. 3) are assumed to be affiliated with power company 310A and power company 310B, respectively. Each of charging stand 300A and charging stand 300B is an example of a "power stand" in the present disclosure.

[0033] The processor 151 can execute a process of switching the digital certificate 154 used in external charging. Specifically, the processor 151 reads out the digital certificate 154 to be used from the storage device 153 when the electric vehicle 200 performs external charging. When, for example, the digital certificate 154a is read out as the digital certificate 154 to be used, the electric vehicle 200 transmits the digital certificate 154a to the charging stand 300 via the communication device 140. When the digital certificate 154 transmitted to the charging stand 300 is compatible with the charging stand 300, external charging is performed between the electric vehicle 200 and the charging stand 300. Note that the digital certificate 154a issued by the electric power company 310A that is affiliated with the charging stand 300A is compatible with the charging stand 300A. The digital certificate 154b issued by the electric power company 310B that is affiliated with the charging stand 300B is compatible with the charging stand 300B.

[0034] Inlet 160 is configured so that a charging connector 301 of charging stand 300 can be inserted therein. Charging connector 301 is provided at the tip of a charging cable 302 attached to charging stand 300. Electrically powered vehicle 200 is electrically connected to charging stand 300 by inserting charging connector 301 into inlet 160. This makes it possible to exchange electric power between charging stand 300 and electric powered vehicle 200.

[0035] The GPS module 170 acquires information (GPS information) indicating the current position of the electric vehicle 200 based on signals from a plurality of artificial satellites, and outputs the GPS information to the processor 151. Note that the electric vehicle 200 may include a beacon receiver (not shown) instead of or in addition to the GPS module 170.

[0036] In the conventional system, an inappropriate digital certificate 154 may be sent from the vehicle to the power station, making it impossible to execute the charging process.

[0037] In this embodiment, the communication device 140 of the electric vehicle 200 acquires identification information related to the charging stand 300 through communication. The identification information includes information about the electric power company with which the charging stand 300 is affiliated. The processor 151 also acquires history information of past external charging (PnC charging) at the charging stand 300. The history information is stored in the storage device 153. Each of the information about the electric power company (identification information) and the history information is an example of "predetermined information" in the present disclosure.

[0038] The processor 151 selects a digital certificate 154 that is suitable for the charging stand 300 (where external charging is performed) from among the multiple digital certificates 154 recorded in the storage device 153, based on the information on the power company (hereinafter sometimes simply referred to as identification information) acquired by the communication device 140, or the history information acquired from the storage device 153. Then, the communication device 140 transmits the digital certificate 154 selected by the processor 151 to the charging stand 300 where external charging is performed.

[0039] This makes it possible to easily transmit the digital certificate 154 that is compatible with the charging stand 300 to the charging stand 300. This makes it possible to easily perform external charging. A specific control will be described with reference to the flowchart shown in FIG.

[0040] <Charging system sequence control> FIG. 4 is a sequence diagram showing sequence control of the charging system 1 including the electric vehicle 200, the charging station 300, and the server 400. As shown in FIG.

[0041] In step S1, the ECU 150 (processor 151) of the electric vehicle 200 determines whether or not the charging station 300 is set as a destination. If the charging station 300 is set as a destination (Yes in S1), the process proceeds to step S4. If the charging station 300 is not set as a destination (No in S1), the process proceeds to step S2.

[0042] When the process of searching for the charging stations 300 is performed on the HMI device 120, a list of the charging stations 300 in the vicinity of the electric vehicle 200 is displayed on a screen 121 (see FIG. 5 ) of the HMI device 120. When one of the charging stations 300 displayed on the screen 121 is selected, the selected charging station 300 may be set as a destination.

[0043] In step S2, the processor 151 determines whether the charging station 300 is within a predetermined distance (for example, within 100 m) of the electric vehicle 200. Location information of the charging station 300 may be stored in the storage device 153, or may be acquired from the server 400 via the communication device 140. If the charging station 300 is within the predetermined distance (Yes in S2), the process proceeds to step S3. If the charging station 300 is not within the predetermined distance (No in S2), the process returns to step S1. Note that the presence of the charging station 300 within the predetermined distance also includes a state in which the electric vehicle 200 has arrived at the charging station 300.

[0044] In step S3, processor 151 determines whether or not it is possible to acquire information (identification information) of a power company affiliated with charging stand 300 determined in step S2 to be within a predetermined distance. For example, the identification information cannot be acquired when electric vehicle 200 cannot communicate with charging stand 300 or when identification information of charging stand 300 is not stored in server 400. If the identification information of charging stand 300 is acquireable (Yes in S3), the process proceeds to step S4. If the identification information of charging stand 300 is not acquireable (No in S3), the process proceeds to step S6.

[0045] In step S4, the processor 151 requests, from the server 400, identification information of the charging station 300 that was set as the destination in step S1 or that was determined to be within a predetermined distance in step S2. The processor 151 may also make the above request to the charging station 300.

[0046] 5, for example, when charging station 300A is selected on screen 121 shown in Fig. 5, it is determined that charging station 300A has been set as the destination, and a signal requesting identification information of charging station 300A is transmitted from electric vehicle 200 to server 400. Furthermore, when charging station 300A comes within a predetermined distance of electric vehicle 200, a signal requesting identification information of charging station 300A is transmitted from electric vehicle 200 to server 400.

[0047] In step S10, server 400 transmits identification information of the requested charging stand 300 to electric vehicle 200 in response to the request signal transmitted from electric vehicle 200 in step S4. As a result, screen 122 (see FIG. 6) including the identification information of charging stand 300 is displayed on HMI device 120 of electric vehicle 200. In the example shown in FIG. 6, information is displayed that AAA Power Company is a company affiliated with charging stand 300A, that charging stand 300A supports PnC charging, and a map showing the location of charging stand 300A.

[0048] In step S5, the processor 151 of the electric vehicle 200 that receives the identification information transmitted from the server 400 in step S10 reads out the digital certificate 154 appropriate for performing external charging. Specifically, the processor 151 reads out the digital certificate 154 issued by the electric power company that is affiliated with the charging stand 300 (the AAA electric power company in FIG. 6) based on the identification information transmitted from the server 400 in step S10. Note that the digital certificate 154 issued by an affiliate of the electric power company that is affiliated with the charging stand 300 may also be read out. After step S5, the process proceeds to step S8.

[0049] On the other hand, in step S6, processor 151 determines whether or not there is a history of PnC charging having been performed in the past with charging station 300 determined in step S2 to be within the predetermined distance. Specifically, processor 151 makes the above determination by reading out the execution history of PnC charging stored in storage device 153. If there is a history (Yes in S6), the process proceeds to step S7. If there is no history (No in S6), the process ends.

[0050] In step S7, processor 151 selects digital certificate 154 to be read based on the history in step S6. Specifically, digital certificate 154 used during PnC charging corresponding to the history is read. After that, the process proceeds to step S8.

[0051] In step S8, the processor 151 transmits the digital certificate 154 read in step S5 or S7 to the charging stand 300 via the communication device 140. After that, the process proceeds to step S30. Note that in step S5, if a matching digital certificate 154 is not recorded in the storage device 153, for example, the digital certificate 154 with the highest priority among the digital certificates 154 recorded in the storage device 153 may be transmitted to the charging stand 300.

[0052] In step S20, the charging station 300 determines whether or not the digital certificate 154 transmitted from the electric vehicle 200 in step S8 is a digital certificate 154 that suits the charging station 300. Specifically, the charging station 300 determines whether or not the digital certificate 154 has been received that has been issued by an electric power company that is affiliated with the charging station 300. If the digital certificate 154 that suits the charging station 300 has been received (Yes in S20), the process proceeds to step S21. If the digital certificate 154 that suits the charging station 300 has not been received (No in S20), the process ends.

[0053] In step S21, the charging stand 300 notifies the electric vehicle 200 and the server 400 that the digital certificate 154 matches the criteria found in step S20. Note that the server 400 may be notified by the electric vehicle 200. After that, the process proceeds to step S30.

[0054] In step S11, the server 400 determines whether the digital certificate 154 determined in step S20 to be compatible with the charging station 300 has expired. If the digital certificate 154 has expired (Yes in S11), the process ends. If the digital certificate 154 has not expired (No in S11), the process proceeds to step S30.

[0055] In step S30, the electric vehicle 200, the charging stand 300, and the server 400 execute PnC charging control.

[0056] Fig. 7 is a diagram showing a specific sequence of step S30 in Fig. 4. Steps S31 to S33 in Fig. 7 are processes that are executed when multiple matching digital certificates 154 are read out in step S5 in Fig. 4.

[0057] In step S31, the processor 151 of the electric vehicle 200 determines whether or not a digital certificate 154 to be used in PnC charging has been set. In other words, it is determined whether or not there is a digital certificate 154 that the user has set in advance as a certificate to be used in PnC charging among the multiple digital certificates 154 read out in step S5 of Fig. 4. If the answer is Yes in step S31, the process proceeds to step S32. If the answer is No in step S31, the process proceeds to step S33.

[0058] In step S32, the processor 151 sets the digital certificate 154 that is set for use in PnC charging as the digital certificate 154 to be used for PnC charging. After that, the process proceeds to step S34.

[0059] In step S33, the processor 151 sets the digital certificate 154 with the highest priority among the multiple digital certificates 154 read in step S5 as the digital certificate 154 to be used for PnC charging. Note that the priority of the digital certificates 154 is set in advance. After that, the process proceeds to step S34.

[0060] In step S34, processor 151 determines whether or not charging connector 301 is connected to electric vehicle 200 (inlet 160) and a secure communication connection is established between electric vehicle 200 and charging stand 300. If the communication connection is established (Yes in S33), the process proceeds to step S35. If the communication connection is not established (No in S33), the process of step S34 is repeated until the communication connection is established. Note that the communication connection is established between electric vehicle 200 and charging stand 300 using User Datagram Protocol (UDP), Transmission Control Protocol (TCP), Transport Layer Security (TLS), etc.

[0061] In step S35, various authentication processes are performed between the electric vehicle 200 and the charging stand 300. For example, processes such as identification, data authentication, and authorization are performed.

[0062] In step S36, settings are performed, such as target settings and charge scheduling settings.

[0063] In step S37, PnC charging is performed between electric vehicle 200 and charging stand 300. In step S38, PnC charging is ended.

[0064] As described above, in the present embodiment, the charging control device 100 includes the processor 151 that selects, from among the multiple digital certificates 154, a digital certificate 154 that is compatible with the charging stand 300, based on predetermined information (identification information and history information) related to the charging stand 300 where external charging is performed between the charging control device 100 and the electric vehicle 200. The communication device 140 transmits the selected digital certificate 154 to the charging stand 300. This allows the charging control device 100 to acquire information on the digital certificate 154 that is compatible with the charging stand 300 before external charging. As a result, the digital certificate 154 that is compatible with the charging stand 300 can be transmitted to the charging stand 300 more reliably than in a case where information on the digital certificate 154 that is compatible with the charging stand 300 is not acquired in advance. This allows external charging to be performed more reliably.

[0065] Furthermore, unlike the case where the user manually switches the digital certificate 154, the appropriate digital certificate 154 is automatically set, reducing the user's troublesome work.

[0066] In the above embodiment, the control when setting (reading) the digital certificate 154 during external charging has been described, but the present disclosure is not limited to this. Instead of or in addition to external charging, the same control as in the above embodiment may be executed when setting (reading) the digital certificate 154 during external discharging (external power supply). In this case, external discharging (external power supply) is an example of "power transmission" in the present disclosure.

[0067] In the above embodiment, an example has been shown in which three determinations are made: whether the charging station 300 is set as the destination, whether the charging station 300 is located within a predetermined distance, and whether there is a history of charging (PnC charging) in the past. However, the present disclosure is not limited to this. Only one or two of the above three determinations may be made. In addition, it is not necessary to determine whether identification information of the charging station 300 can be obtained (see S6 in FIG. 4).

[0068] In the above embodiment, an example has been described in which the charging control device 100 is provided in the electric vehicle 200, but the present disclosure is not limited to this. The charging control device 100 may be provided in the server 400.

[0069] In the above embodiment, an example has been described in which the charging system 1 is configured with the electric vehicle 200, the charging stand 300, and the server 400, but the present disclosure is not limited to this. A charging system may be configured with the electric vehicle 200 and the charging stand 300.

[0070] In the above embodiment, an example has been described in which the identification information of the charging stand 300 is acquired from the charging stand 300 or the server 400, but the present disclosure is not limited to this. For example, the identification information of the charging stand 300 may be stored in the storage device 153. In this case, the identification information stored in the storage device 153 is acquired (read) by the processor 151.

[0071] In the above embodiment, an example has been described in which the history information of external charging is stored in the storage device 153, but the present disclosure is not limited to this.

[0072] The configurations of the above-described embodiment and the above-described modified examples may be combined with each other.

[0073] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0074] 100 charging control device (power transmission control device), 140 communication device (acquisition unit) (transmission unit), 151 processor (selection unit) (acquisition unit), 153 storage device (recording unit), 154, 154a, 154b digital certificate (contract certificate information), 200 electric vehicle, 210 battery (secondary battery), 300, 300A, 300B charging stand (power stand), 310A, 310B power company.

Claims

1. A power transmission control device that controls power transmission including at least one of charging and discharging of a secondary battery of an electric vehicle, A recording unit that records a plurality of pieces of contract certificate information related to the power transmission; an acquisition unit that acquires predetermined information related to a power station between which the power transmission is performed and the electric vehicle; a selection unit that selects contract certificate information that is suitable for the power station from among the plurality of contract certificate information based on the acquired predetermined information; a transmission unit that transmits selected contract certificate information to the power stand.

2. the acquiring unit acquires, when the power station is set as a destination, identification information of the power station set as the destination as the predetermined information; The power transmission control device according to claim 1 , wherein the selection unit selects, based on the identification information, contract certificate information that matches the power station set at the destination.

3. when a distance between the electric vehicle and the power station becomes within a predetermined distance, the acquisition unit acquires, as the predetermined information, identification information of the power station located within the predetermined distance; The power transmission control device according to claim 1 , wherein the selection unit selects, based on the identification information, contract certificate information that matches the power station located within the predetermined distance.

4. when a distance between the electric vehicle and the power station becomes within a predetermined distance, the acquisition unit acquires, as the predetermined information, history information of past power transmission at the power station located within the predetermined distance; The power transmission control device according to claim 1 , wherein the selection unit selects, based on the history information, contract certificate information that matches the power station located within the predetermined distance.

5. The selection unit is When the power station is not set as a destination, if the distance between the electric vehicle and the power station is within a predetermined distance and identification information of the power station located within the predetermined distance can be acquired by the acquisition unit, select contract certificate information that matches the power station located within the predetermined distance based on the identification information, 5. The power transmission control device according to claim 1, wherein, in a situation where the power station is not set as the destination, when the distance between the electric vehicle and the power station is within the specified distance and the identification information cannot be acquired by the acquisition unit, history information of past power transmission at the power station located within the specified distance is used to select contract certificate information that is compatible with the power station located within the specified distance.

6. The power transmission control device according to claim 2 , wherein the identification information includes information about a power company with which the power station is affiliated.

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