Battery replacement instructions and battery replacement system

Abstract

To provide a method for guiding battery exchange, capable of suppressing arrival at a destination from becoming difficult due to SOC shortage of an electric vehicle after battery exchange in a battery exchange station.SOLUTION: A method for guiding battery exchange, includes: a step of searching for a battery station 20 that an electric vehicle 10 can reach (first searching step); and a step of searching for the battery station 20 that stores a battery 21 having SOC more than a predetermined value (SOC required from the battery station 20 to the destination + a value desired by a user with regard to a residual amount of SOC upon arrival at the destination (second searching step). The guiding method includes a step of notifying the user of the electric vehicle 10 of information on the battery station 20 extracted through the two searching steps.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a battery replacement guidance method and a battery replacement system.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2014-135892 (Patent Document 1) discloses an electric vehicle that identifies reachable battery service stations based on the state of charge of the battery of the electric vehicle and the position of the electric vehicle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the electric vehicle disclosed in Patent Document 1, depending on the state of charge (SOC) of the battery mounted on the electric vehicle at the battery service station, it may be difficult for the electric vehicle to reach the destination. It is desired to suppress the difficulty of reaching the destination due to insufficient SOC of the electric vehicle after battery replacement at the battery service station (battery replacement station).

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a battery replacement guidance method and a battery replacement system capable of suppressing the difficulty of reaching the destination due to insufficient SOC of the electric vehicle after battery replacement at the battery replacement station.

Means for Solving the Problems

[0006] The battery replacement guidance method relating to the first aspect of this disclosure comprises the steps of: acquiring SOC information of a first battery installed in an electric vehicle; acquiring SOC information of a second battery stored in at least one battery replacement station; calculating the distance between the electric vehicle and the battery replacement station; a first search step of searching for a battery replacement station reachable by the electric vehicle using the distance information and the SOC information of the first battery; a second search step of searching for a battery replacement station storing a second battery whose SOC is greater than a predetermined value using the SOC information of the second battery; and notifying the user of the electric vehicle of the battery replacement station information extracted by the search in the first search step and the search in the second search step.

[0007] In the battery replacement guidance method relating to the first aspect of this disclosure, as described above, information on battery replacement stations extracted by a first search step for searching for battery replacement stations reachable by the electric vehicle, and a second search step for searching for battery replacement stations containing a second battery with a State of Charge (SOC) greater than a predetermined value, is notified to the user of the electric vehicle. This prevents a second battery with an SOC below a predetermined value from being installed in the electric vehicle. As a result, it is possible to prevent the electric vehicle from becoming unable to reach its destination due to insufficient SOC. Furthermore, the search in the first search step prevents the electric vehicle from becoming power-deficient before reaching a battery replacement station.

[0008] In the battery replacement guidance method relating to the first phase described above, preferably, the method further includes the steps of acquiring information regarding the destination of the electric vehicle and calculating the State of Charge (SOC) required to reach the destination from the battery replacement station. The second search step is to search for a battery replacement station that stores a second battery that is charged to a level greater than or equal to the SOC required to reach the destination from the battery replacement station. With this configuration, it is possible to suppress the SOC of the second battery from becoming zero before reaching the destination. As a result, it is possible to further suppress the difficulty in reaching the destination due to insufficient SOC of the electric vehicle.

[0009] In this case, preferably, the system further includes a step of obtaining a value desired by the user for the State of Charge (SOC) of the electric vehicle, which represents the SOC remaining when the electric vehicle reaches its destination. The second search step is to search for a battery exchange station that stores a second battery that is charged to a value greater than or equal to the sum of the SOC required to reach the destination from the battery exchange station and the above-mentioned desired value. With this configuration, it is possible to prevent the SOC of the electric vehicle from falling below the above-mentioned desired value when the electric vehicle reaches its destination.

[0010] In the battery replacement guidance method relating to the first phase described above, preferably, a step of obtaining reservation information of other electric vehicles at the battery replacement station is further provided. The second search step is to search for a battery replacement station in which the number of second batteries with an SOC of 1 / 2 or greater than the predetermined value is greater than the number of other electric vehicles that have reserved the battery replacement station. With this configuration, it is possible to prevent a shortage of second batteries with an SOC of 1 / 2 or greater when an electric vehicle has its batteries replaced at a battery replacement station.

[0011] In the battery replacement guidance method relating to the first phase described above, preferably, the electric vehicle is equipped with a display unit. The notification step is to display the locations of battery replacement stations extracted by the search in the first search step and the search in the second search step on the display unit in a first manner, and to display the locations of battery replacement stations that were not extracted by the search in the first search step and the search in the second search step on the display unit in a second manner different from the first manner. With this configuration, the user of the electric vehicle can easily grasp the locations of battery replacement stations extracted by the search.

[0012] In this case, preferably, the notification step is to hide the locations of battery replacement stations that were not extracted by the search in the first search step and the search in the second search step on the display unit, and then display the locations of battery replacement stations extracted by the search in the first search step and the search in the second search step on the display unit. With this configuration, electric vehicle users can more easily grasp the locations of battery replacement stations extracted by the search.

[0013] In the battery replacement guidance method relating to the first phase described above, preferably, the method further includes a step of prompting the user to make a reservation for a battery replacement station extracted by the search in the first search step and the search in the second search step, or a step of making a reservation for a battery replacement station extracted by the search in the first search step and the search in the second search step. With this configuration, it is possible to prevent battery replacement stations extracted by the above search from remaining unreserved by the user.

[0014] The battery exchange system relating to the second aspect of this disclosure comprises an electric vehicle equipped with a first battery, at least one battery exchange station storing a second battery, and a control device that acquires SOC information of the first battery and SOC information of the second battery. The control device calculates the distance between the electric vehicle and the battery exchange station, performs a first search using the distance information and the SOC information of the first battery to search for a battery exchange station reachable by the electric vehicle, performs a second search using the SOC information of the second battery to search for a battery exchange station storing a second battery whose SOC is greater than a predetermined value, and controls the electric vehicle to notify the user of the battery exchange station information extracted by the first and second searches.

[0015] In the battery swapping system according to the second aspect of the present disclosure, as described above, the information of the battery swapping stations extracted by the first search for searching for battery swapping stations reachable by the electric vehicle and the second search for searching for battery swapping stations storing the second battery with an SOC greater than a predetermined value using the SOC information of the second battery is notified to the user of the electric vehicle. Thereby, it is possible to provide a battery swapping system capable of suppressing the difficulty of reaching the destination due to the insufficient SOC of the electric vehicle.

Effects of the Invention

[0016] According to the present disclosure, after battery swapping at the battery swapping station, it is possible to suppress the difficulty of reaching the destination due to the insufficient SOC of the electric vehicle.

Brief Description of the Drawings

[0017] [Figure 1] It is a diagram showing the configuration of a battery swapping system according to an embodiment. [Figure 2] It is a sequence diagram of a battery swapping system according to an embodiment. [Figure 3] It is a diagram showing a first screen of car navigation according to an embodiment. [Figure 4] It is a diagram showing a second screen of car navigation according to an embodiment. [Figure 5] It is a diagram showing a screen of car navigation according to a modification of an embodiment. [Figure 6] It is a sequence diagram of a battery swapping system according to a modification of an embodiment.

Modes for Carrying Out the Invention

[0018] 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 numerals and their description will not be repeated.

[0019] FIG. 1 is a diagram showing the configuration of the battery replacement system 1 according to the present embodiment. The battery replacement system 1 includes a server 100, a plurality of electric vehicles 10, and a plurality of battery stations 20. The battery replacement system 1 and the battery station 20 are examples of the "battery replacement system" and the "battery replacement station" of the present disclosure. The server 100 is an example of the "control device" of the present disclosure.

[0020] The electric vehicle 10 includes a battery 11, a communication device 12, and a car navigation system 13. The battery 11 supplies power to various electrical devices such as a traveling motor (not shown) of the electric vehicle 10. The battery 11 and the car navigation system 13 are examples of the "first battery" and the "display unit" of the present disclosure, respectively.

[0021] The communication device 12 of the electric vehicle 10 communicates with a communication unit 103 of the server 100 described later. The electric vehicle 10 transmits its own position information, SOC information, etc. to the server 100 through the communication device 12. Note that the above information may be transmitted to the server 100 through a mobile terminal or the like possessed by the user of the electric vehicle 10.

[0022] The electric vehicle 10 includes, for example, a PHEV (Plug-in Hybrid Electric Vehicle), a BEV (Battery Electric Vehicle), and a FCEV (Fuel Cell Electric Vehicle). The communication device 12 of the electric vehicle 10 may include a DCM (Data Communication Module) or a communication I / F compatible with 5G (the fifth-generation mobile communication system).

[0023] Each of the plurality of battery stations 20 includes a plurality of batteries 21 that can be exchanged with the battery 11. Inside the battery station 20, the battery 11 of the electric vehicle 10 and the battery 21 are exchanged. The battery 21 is an example of the "second battery" of the present disclosure.

[0024] The battery station 20 also includes a processor 22, a memory 23, a communication unit 24, and a battery exchange processing unit 25. The battery exchange processing unit 25 performs the process of exchanging battery 11 and battery 21. The processor 22 controls the battery exchange processing unit 25.

[0025] Memory 23 stores not only the program executed by the processor 22, but also information used by the program (for example, maps, mathematical formulas, and various parameters).

[0026] Each communication unit 24 of the multiple battery stations 20 communicates with the communication unit 103 of the server 100. The communication unit 103 of the server 100 obtains information from each communication unit 24 of the multiple battery stations 20, including SOC information of the batteries 21 stored in the battery stations 20, and reservation information for battery replacement at the battery stations 20 (information on the number of reservations).

[0027] The server 100 includes a processor 101, a memory 102, and a communication unit 103. The processor 101 controls the communication unit 103. The memory 102 stores programs executed by the processor 101, as well as information used by the programs (for example, maps, formulas, and various parameters).

[0028] Memory 102 stores the location information of each of the multiple battery stations 20. Note that this location information may be transmitted from each of the multiple battery stations 20.

[0029] In conventional systems, depending on the State of Charge (SOC) of the battery installed in the electric vehicle at the battery station, it may be difficult for the electric vehicle to reach its destination. It is desirable to prevent situations where electric vehicles become unable to reach their destination due to insufficient SOC after battery replacement at a battery station.

[0030] Therefore, in this embodiment, the processor 101 uses the SOC information of the battery 21 to search for a battery station 20 that stores a battery 21 whose SOC is equal to or greater than a predetermined threshold. A detailed explanation will be given with reference to the sequence diagram in Figure 2. The predetermined threshold will be explained in detail later. The predetermined threshold is an example of the "predetermined value," "SOC required to reach the destination," and "total value" in this disclosure.

[0031] (Sequence control of battery replacement system) The sequence control of the battery replacement system 1 will be explained with reference to Figure 2. Note that the sequence control shown in Figure 2 is just one example and is not the only possible sequence control.

[0032] In step S1, based on the user selecting button 130a (see Figure 3) displayed on the screen 130 of the car navigation system 13, the electric vehicle 10 receives an operation to search for the battery station 20.

[0033] In step S2, the electric vehicle 10 transmits its location information to the communication unit 103 of the server 100 via the communication device 12. As a result, the server 100 obtains the location information of the electric vehicle 10.

[0034] In step S3, the electric vehicle 10 transmits information about the State of Charge (SOC) of its battery 11 to the communication unit 103 of the server 100 via the communication device 12. As a result, the server 100 obtains the SOC information of the electric vehicle 10.

[0035] In step S4, the electric vehicle 10 transmits information about the user's destination to the communication unit 103 of the server 100 via the communication device 12. As a result, the server 100 obtains the destination information of the electric vehicle 10.

[0036] In step S5, the electric vehicle 10 transmits, via the communication device 12, a desired value of the State of Charge (SOC) remaining in the electric vehicle 10's battery 11 when the electric vehicle 10 reaches its destination. For example, the user may input the desired value on a screen (not shown) displayed on the car navigation system 13 by selecting the button 130a. Note that the desired value is an example of the "desired value" in this disclosure.

[0037] In step S6, the electric vehicle 10 transmits information regarding its energy consumption to the communication unit 103 of the server 100 via the communication device 12 or the like. For example, the electric vehicle 10 transmits information such as the average value of power consumption over a predetermined period in the past (for example, one week) to the communication unit 103 as energy consumption information. As a result, the server 100 obtains information regarding the energy consumption of the electric vehicle 10. The server 100 may use the catalog value (design value) of the energy consumption of the electric vehicle 10 according to the model of the electric vehicle 10 as the energy consumption of the electric vehicle 10.

[0038] The processes in steps S2 to S6 may be executed in any order. For example, the processes in steps S2 to S6 may be performed simultaneously. Also, the information in steps S2 to S6 may be sent to the server 100 from the user's smartphone or other device.

[0039] In step S7, each communication unit 24 of the multiple battery stations 20 transmits the SOC information of the battery 21 stored in the battery station 20 to the communication unit 103 of the server 100. As a result, the server 100 obtains the SOC information of the battery 21 stored in each battery station 20.

[0040] In step S8, each communication unit 24 of the multiple battery stations 20 transmits battery replacement reservation information for the battery station 20 to the communication unit 103 of the server 100. As a result, the server 100 obtains battery replacement reservation information for other electric vehicles 10 (electric vehicles 10 other than the electric vehicles 10 that transmitted various information to the server 100 in steps S2 to S6) at each of the multiple battery stations 20.

[0041] The processes in steps S7 and S8 may be executed in any order. For example, the processes in steps S7 and S8 may be performed simultaneously.

[0042] In step S9, the processor 101 calculates the distance between the electric vehicle 10 and each of the battery stations 20. Specifically, the processor 101 calculates the distance based on the location information of the electric vehicle 10 obtained by the processing in step S2 and the location information of each of the battery stations 20 stored in the memory 102.

[0043] In step S10, the processor 101 calculates the State of Charge (SOC) required for the electric vehicle 10 to reach each of the battery stations 20. Specifically, the processor 101 calculates the SOC required for the electric vehicle 10 to reach each of the battery stations 20 based on the distance information calculated in step S9 and the power consumption information of the electric vehicle 10 obtained through the processing in step S6.

[0044] In step S11, the processor 101 searches for a battery station 20 that the electric vehicle 10 can reach, using the SOC information (SOC required to reach the battery station 20) calculated in step S10 and the SOC information of the battery 11 obtained through the processing in step S3. Specifically, the processor 101 searches for a battery station 20 in which the SOC of the battery 11 is equal to or greater than the SOC calculated in step S10. Step S11 is an example of the "first search step" in this disclosure.

[0045] In step S12, the processor 101 calculates the State of Charge (SOC) required to reach the destination from each of the battery stations 20. Specifically, the processor 101 uses the location information of each battery station 20 and the destination information obtained in step S4 to calculate the distance between each battery station 20 and the destination. Then, the processor 101 uses the distance information between each battery station 20 and the destination and the power consumption information of the electric vehicle 10 to calculate the SOC required to reach the destination from each battery station 20.

[0046] In step S13, the processor 101 searches for a battery station 20 that stores a battery 21 that is charged to a value greater than or equal to the sum of the SOC required to reach the destination from the battery station 20 (SOC calculated in step S13) and the desired value obtained by the processing in step S5. The above sum is an example of the “predetermined value” in this disclosure.

[0047] In step S14, the processor 101 searches for battery stations 20 in which the number of batteries 21 with a State of Charge (SOC) equal to or greater than the total value mentioned above is greater than the number of other electric vehicles 10 that have reserved the battery station 20. Specifically, the processor 101 uses the search results from step S13 and the reservation information obtained through the processing in step S8 to determine whether the number of batteries 21 at each battery station 20 is greater than the number of other electric vehicles 10. If there is a battery station 20 in which the number of batteries 21 is greater than the number of other electric vehicles 10 (Yes in S14), the process proceeds to step S15. If there is no battery station 20 in which the number of batteries 21 is greater than the number of other electric vehicles 10 (No in S14), the process returns to step S2. Steps S13 and S14 are examples of the "second search process" in this disclosure.

[0048] In step S15, the user of the electric vehicle 10 is notified of the battery station 20 information extracted by the search in step S11 and the search in step S13 (S14). Specifically, the user is notified of battery stations 20 that are reachable by the electric vehicle 10 and have a number of batteries 21 with a SOC equal to or greater than the total value mentioned above that is equal to or greater than the number of reservations. At this time, a display command is sent to the electric vehicle 10 to display the information of the corresponding battery station 20 on the car navigation system 13. Note that step S15 is an example of the "notification process" in this disclosure.

[0049] In step S16, the electric vehicle 10 displays the screen 131 shown in Figure 4 on the car navigation system 13 based on the display command obtained by the processing in step S15. Specifically, on screen 131, the location of the battery station 20 notified in step S15 is displayed in a first manner (see circle 131a in Figure 4). On the other hand, on screen 131, the location of the battery station 20 that was not notified in step S15 is displayed in a second manner (see triangle 131b in Figure 4). Note that the circle 131a may be selectable, and the triangle 131b may be set to not selectable.

[0050] In step S17, the processor 101 prompts the user of the electric vehicle 10 to reserve the battery station 20 as notified by the process in step S15. Specifically, as shown in Figure 4, the processor 101 displays a message 131c on the screen 131 prompting the user to reserve the battery station 20 as notified by the process in step S15 (sending a display command).

[0051] In step S18, the electric vehicle 10 accepts a selection operation (reservation operation) of a battery station 20 on screen 131. Specifically, when the user touches any of the circles 131a on screen 131, a reservation for the battery station 20 corresponding to the touched circle 131a is accepted.

[0052] In step S19, the processor 101 registers the reservation for the battery station 20 that was accepted in step S18.

[0053] As described above, in the above embodiment, information on the battery stations 20 extracted by step S11, which searches for a battery station 20 that the electric vehicle 10 can reach, and step S13 (S14), which searches for a battery station 20 that stores a battery 21 whose SOC is greater than the above total value (SOC required to reach the destination from the battery station 20 + the above desired value regarding the remaining amount of SOC), is notified to the user of the electric vehicle 10. This makes it possible to prevent the electric vehicle 10 from having difficulty reaching its destination due to insufficient SOC. Furthermore, since it is prevented the SOC from falling below the above desired value, it is possible to prevent the electric vehicle 10 from having difficulty moving after reaching its destination due to insufficient SOC.

[0054] In the above embodiment, an example was shown in which the extracted battery stations 20 and the battery stations 20 that were not extracted are displayed in different ways, but the disclosure is not limited thereto. For example, the processor 101 may cause the car navigation system 13 to display the screen 132 shown in Figure 5. In screen 132, the battery stations 20 that were extracted in the processing of steps S11 and S13 (S14) are hidden (see the dashed circles in Figure 5), while the battery stations 20 that were extracted in the processing of steps S11 and S13 (S14) are displayed (see the circle 132a in Figure 5). Note that in Figure 5, for clarity, the positions of the battery stations 20 that are hidden are shown with dashed lines, but in reality, the dashed lines are not displayed.

[0055] Furthermore, while the above embodiment shows an example in which the processor 101 prompts the user to reserve a battery station 20, this disclosure is not limited thereto. For example, as shown in step S27 in Figure 6, the processor 101 may select one of the battery stations 20 extracted by the search in steps S11 and S13 (S14), and reserve the selected battery station 20. The processor 101 may, for example, select the battery station 20 that is closest to the electric vehicle 10 from among the extracted battery stations 20. In Figure 6, the same reference numerals are used for steps of the same process as in the above embodiment.

[0056] Furthermore, while the above embodiment shows an example in which a battery station 20 containing a battery 21 charged to a value equal to or greater than the sum of the SOC required for the electric vehicle 10 to reach its destination from the battery station 20 and the desired value relating to the remaining SOC of the electric vehicle 10, this disclosure is not limited to this. A battery station 20 containing a battery 21 charged to a value equal to or greater than the SOC required for the electric vehicle 10 to reach its destination from the battery station 20 may be searched. Alternatively, a battery station 20 containing a battery 21 charged to a predetermined SOC (for example, 80%) or greater may be searched.

[0057] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0058] 1 Battery exchange system, 10 Electric vehicle, 11 Battery (first battery), 13 Car navigation system (display unit), 20 Battery station (battery exchange station), 21 Battery (second battery), 100 Server (control unit).

Claims

1. A process for acquiring SOC information of the first battery installed in an electric vehicle, A step of obtaining SOC information of a second battery stored in at least one battery exchange station, A step of calculating the distance between the electric vehicle and the battery exchange station, A first search step involves using the distance information and the SOC information of the first battery to search for the battery exchange station that the electric vehicle can reach, The process of obtaining information on the number of reservations for other electric vehicles that have reserved the use of the aforementioned battery exchange station, A second search step involves using the SOC information of the second battery to search for the battery exchange station in which the second battery has an SOC greater than or equal to a predetermined value greater than 0, A step of notifying the user of the electric vehicle of the information of the battery exchange station extracted by the search in the first search step and the search in the second search step, A step of obtaining information regarding the destination of the electric vehicle, The process includes a step of calculating the SOC required to reach the destination from the battery exchange station, The second search step is a step of searching for a battery exchange station that stores a second battery that has been charged to a level greater than or equal to the SOC required to reach the destination from the battery exchange station, The battery replacement guidance method is a method in which the second search step is a step of searching for a battery replacement station in which the number of second batteries with a State of Control (SOC) of the same value or higher is greater than the number of reserved units.

2. The process further includes a step of obtaining a value desired by the user for the State of Control (SOC) of the electric vehicle, which represents the SOC remaining when the electric vehicle reaches the destination. The battery replacement guidance method according to claim 1, wherein the second search step is a step of searching for a battery replacement station that stores a second battery that has been charged to a value greater than or equal to the sum of the SOC required to reach the destination from the battery replacement station and the desired value.

3. The process further includes acquiring information on electricity consumption, which is the average value of the electricity consumption of the electric vehicle over a predetermined period in the past. The battery replacement guidance method according to claim 1 or 2, wherein the first search step is a step of searching for a battery replacement station that the electric vehicle can reach using the power consumption information, the distance information, and the SOC information of the first battery.

4. The aforementioned electric vehicle is equipped with a display unit, The battery replacement guidance method according to claim 1 or 2, wherein the notification step is to display the locations of the battery replacement stations extracted by the search in the first search step and the search in the second search step in the display unit in a first manner, and to display the locations of the battery replacement stations that were not extracted by the search in the first search step and the search in the second search step in a second manner different from the first manner on the display unit.

5. The battery replacement guidance method according to claim 4, wherein the notification step is to display on the display unit the locations of the battery replacement stations extracted by the search in the first search step and the search in the second search step, while hiding on the display unit the locations of the battery replacement stations extracted by the search in the first search step and the search in the second search step.

6. A battery replacement guidance method according to claim 1 or 2, further comprising the steps of prompting the user to make a reservation for the battery replacement station extracted by the search in the first search step and the search in the second search step, or making a reservation for the battery replacement station extracted by the search in the first search step and the search in the second search step.

7. The battery replacement guidance method according to claim 6, wherein the step of making the reservation is to make a reservation for the battery replacement station that is closest to the electric vehicle among the battery replacement stations extracted by the search in the first search step and the search in the second search step.

8. An electric vehicle equipped with the first battery, A battery exchange station containing a second battery, The system includes a control device that acquires SOC information for the first battery and SOC information for the second battery, The control device is The distance between the electric vehicle and the battery exchange station is calculated, Using the distance information and the SOC information of the first battery, a first search is performed to search for the battery exchange station that the electric vehicle can reach. We obtain information on the number of reservations for other electric vehicles that have reserved the use of the aforementioned battery exchange station. Using the SOC information of the second battery, a second search is performed to search for the battery exchange station in which the second battery has an SOC greater than or equal to a predetermined value greater than 0. Information regarding the destination of the electric vehicle is obtained, The State of Cost (SOC) required to reach the destination from the aforementioned battery exchange station is calculated. The system controls the notification of the battery exchange station information extracted by the first and second searches to the user of the electric vehicle. The second search involves searching for a battery exchange station that stores a second battery that has been charged to a level greater than or equal to the SOC required to reach the destination from the battery exchange station. The battery exchange system, wherein the second search involves searching for a battery exchange station where the number of second batteries with a State of Control (SOC) equal to or greater than the predetermined value is greater than the number of reserved units.

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