JP4135155B2 - Charging stand - Google Patents

Description

  The present invention relates to a charging stand that accumulates a chargeable capacity in a plurality of electric vehicles and charges a battery mounted on the electric vehicle when the electric vehicle is connected.

  Conventionally, a charging stand that is equipped with a battery and charges an electric vehicle that travels using electric power charged in the battery is known in Patent Document 1 below.

The charging stand described in Patent Document 1 includes a capacitor having a capacity larger than that of a vehicle battery, and the capacitor is charged with electric power from a commercial power supply and is discharged from the capacitor to charge the vehicle battery.
JP-A-7-115732

  In order to charge a plurality of electric vehicles at a time, the charging station as described above needs to include a plurality of capacitors and a plurality of connectors that connect the capacitors and the electric vehicles.

  However, in this charging station, every time the charging operation for one electric vehicle is completed, if the capacitor used for the charging operation is charged, there is a possibility that all the capacitors are being charged. There was a possibility that it would not be possible to make a new electric vehicle charge.

  Therefore, the present invention has been proposed in view of the above-described situation, and among the plurality of capacitors in the charging stand, a capacitor that performs charging from an external power source and a capacitor that performs discharge to an electric vehicle are appropriately used. The purpose is to suppress the situation in which it is not possible to cause a new electric vehicle to be charged.

  The charging station according to the present invention is charged with external power, and discharges the charged power to charge the vehicle battery, and charging capacity detection means for detecting the charging capacity charged in the battery. , Charging means for charging external power to the battery, discharging means for discharging the battery and supplying it to the vehicle battery, and control for controlling charging and discharging of the battery by external power by controlling the charging means and discharging means Means.

  In such a charging stand, before charging the vehicle battery mounted on the electric vehicle, the determination unit determines the storage unit excluding the storage unit being charged by the external power and the storage unit being discharged to the vehicle battery, The selecting unit selects the capacitor having the smallest charging capacity detected by the charging capacity detecting unit from among the capacitors determined by the determining unit, and connects the vehicle battery and the capacitor selected by the selecting unit from the controlling unit. Thus, the above-described problem is solved by controlling the discharging means to discharge the battery and charge the vehicle battery.

  According to the charging stand according to the present invention, the storage battery except for the storage battery being charged and the storage battery being discharged to the vehicle battery is determined by external power, and the storage battery having the smallest charging capacity is selected from the determined storage battery. Since the vehicle battery is charged, it is possible to charge the battery with low capacity by giving priority to discharging the battery, and then charging the battery from the external power source among the plurality of batteries and discharging to the electric vehicle. It is possible to suppress a situation in which it is not possible to appropriately determine a storage battery and cause a new electric vehicle to be charged.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The present invention is applied to, for example, a charging stand 1 configured as shown in FIG.

[Configuration of charging stand 1]
The charging stand 1 is connected to a plurality of external power sources 2A, 2B, 2C (hereinafter, simply referred to as “external power source 2” when collectively referred to), for example, which are commercial power sources. In response to charging the storage battery, three charger connectors 3A, 3B, 3C (hereinafter simply referred to as “charger connector 3” when collectively referred to) are provided to provide three electric vehicles 10. Can be connected. FIG. 1 shows a case where one electric vehicle 10A is connected to the charger connector 3A and one electric vehicle 10B is disconnected from the charger connector 3C.

  Electric vehicles 10A and 10B are equipped with vehicle batteries 12A and 12B (hereinafter simply referred to as “vehicle battery 12” when collectively referred to), an in-vehicle charge control unit and a drive motor (not shown). The electric vehicle 10 generates traveling torque by discharging electric power charged in the vehicle battery 12 and supplying the electric power to the drive motor during traveling.

  In addition, electric vehicles 10A and 10B have a power harness and vehicle charging connectors 11A and 11B (hereinafter simply referred to as “vehicle charging connector 11” when collectively referred to) for connecting to charging station 1 during charging. Provided. Note that the power harness and the vehicle charging connector 11 may be connected to the vehicle battery 12 only during charging, or may be connected to the vehicle battery 12 at all times.

  When the electric vehicle 10 is charged, the power harness and the charger connector 3 of the charging stand 1 and the vehicle charging connector 11 are connected. As a result, the electric vehicle 10 is in a state in which power from the charging station 1 can be supplied, and in a state in which signal communication between the in-vehicle charging control unit and the charging station 1 is possible. In such a state, the electric vehicle 10 performs on / off control of a relay circuit provided on the vehicle charging connector 11 side of the vehicle battery 12, transmission of the SOC of the vehicle battery 12, and the like by the in-vehicle charging control unit. Then, the vehicle battery 12 is charged with the electric power from the charging station 1.

  The charging stand 1 includes a plurality of battery chargers 21A, 21B, and 21C connected to external power sources 2A, 2B, and 2C (hereinafter simply referred to as “capacitor charger 21” when collectively referred to), and an external power source. Side connector 22, capacitors 23A, 23B, 23C, 23D (hereinafter simply referred to as “capacitor 23” when collectively referred to) and capacity detectors 24A, 24B, 24C, 24D (hereinafter simply referred to as generic) (Referred to as “capacity detector 24”), vehicle-side connector 25, and vehicle chargers 26A, 26B, and 26C (hereinafter simply referred to as “vehicle charger 26” when collectively referred to). In the charging stand 1, the charger connector 3 is connected to the vehicle charger 26 via a power harness.

  The charging stand 1 includes a plurality of charging operation switches 27A, 27B, and 27C (hereinafter simply referred to as “charging operation switch 27” when collectively referred to), a charging control unit 28, and an alarm device 29. The charging operation switch 27 and the alarm device 29 are provided at a position that is visible to the user of the electric vehicle 10.

  The battery charger 21 is composed of an AC / DC converter, and converts AC power from the external power source 2 into DC power in response to a command from the charge control unit 28. The battery charger 21 converts the voltage into a voltage value according to the setting of the battery 23 described later, and supplies the voltage value to the external power supply side connector 22.

  The external power supply side connector 22 switches connection / disconnection between the battery charger 21 and the battery 23. The external power supply side connector 22 includes a relay group 22A connected to the battery charger 21A, a relay group 22B connected to the battery charger 21B, and a relay group 22C connected to the battery charger 21C. Each of the relay groups 22A, 22B, and 22C is connected to four capacitors 23A, 23B, 23C, and 23D, and includes four relays corresponding to each capacitor 23. The four relays constituting the relay groups 22A, 22B, and 22C have one end connected to the battery charger 21 and the other end connected to the four batteries 23. Accordingly, the external power supply side connector 22 has a configuration in which all the relay groups 22A, 22B, and 22C can be connected to any one of the capacitors 23, and all the chargers 21 for the capacitors are connected to all the capacitors 23. It can be connected.

  Such an external power supply side connector 22 is designated as a relay that closes by a control signal from the charge control unit 28, and controls an electromagnetic circuit (not shown) or the like so as to close the relay. Specifically, when the DC power converted by the battery charger 21A is charged in the battery 23A, a control signal for closing the relay described at the top of the relay group 22A in FIG. 28 to the external power supply side connector 22. Thereby, the external power supply side connector 22 can bring the battery charger 21A and the battery 23A into a connected state.

  The vehicle-side connector 25 switches connection / disconnection between the battery 23 and the vehicle charger 26. The vehicle-side connector 25 includes relay groups 25A, 25B, and 25C connected to all the capacitors 23. The relay groups 25A, 25B, and 25C are connected to the vehicle chargers 26A, 26B, and 26C, respectively, and include four relays corresponding to the respective capacitors 23. The four relays constituting the relay groups 25A, 25B, and 25C have one end connected to the battery 23 and the other end connected to a single vehicle charger 26. Thus, the vehicle-side connector 25 is configured such that all the relay groups 25A, 25B, 25C can be connected to any one of the capacitors 23, and all the capacitors 23 are connected to the single vehicle charger 26. It can be connected.

  Such a vehicle-side connector 25 is designated by a relay that is closed by a control signal from the charging control unit 28, and controls an electromagnetic circuit (not shown) or the like so that the relay is closed. Specifically, when the DC power charged by the battery 23B is charged to the vehicle battery 12A of the electric vehicle 10A via the vehicle charger 26A, the relay group 22A is described as the second upper side in FIG. A control signal for closing the relay is supplied from the charging control unit 28 to the vehicle-side connector 25. Thereby, the vehicle side connector 25 can make the electrical storage device 23B and the vehicle charger 26A into a connected state.

  Each of the capacitors 23A, 23B, 23C, and 23D has a larger charge capacity than the vehicle battery 12. The battery 23 has one end connected to the battery charger 21 via the external power supply side connector 22 and the other end connected to the vehicle charger 26 via the vehicle side connector 25. The battery 23 is charged and discharged by the power of the external power source 2 according to the control of the charge control unit 28.

  The charge capacities of the capacitors 23A, 23B, 23C, and 23D are detected by the capacity detectors 24A, 24B, 24C, and 24D, respectively. The capacity detector 24 detects SOC (State Of Charge) as the charge capacity of the battery 23 and outputs it to the charge control unit 28.

  The vehicle charger 26 is composed of a DC / DC converter, and in response to a command from the charge control unit 28, direct current power from the battery 23 supplied via the vehicle-side connector 25 is set to the vehicle battery 12. Convert to the voltage according to. It should be noted that the current value converted by the vehicle charger 26 is a large value in order to realize rapid charging (charging in a short time) of the vehicle battery 12. The DC power converted by the vehicle charger 26 is supplied to the vehicle battery 12 via the charger connector 3 and the vehicle charging connector 11 to charge the vehicle battery 12.

  The charging operation switch 27 is operated by the user of the electric vehicle 10 or the like when charging the vehicle battery 12 is started or stopped. The operating state of the charging operation switch 27 is detected by the charging control unit 28.

  The indicator 29 displays whether or not the charging operation from the charging station 1 to the vehicle battery 12 is possible, the predicted SOC value after charging the vehicle battery 12, the abnormality of the charging station 1 and the electric vehicle 10, and the like. Presented to the user of the electric vehicle 10 or the like. At this time, the alarm device 29 displays various information according to a control signal from the charge control unit 28.

  The charge control unit 28 is a control means, and controls the above-described battery charger 21, external power source side connector 22, vehicle side connector 25, and vehicle charger 26, thereby using the power of the external power source 2. The battery 23 is charged and the vehicle battery 12 is charged by discharging the charging power of the battery 23.

  That is, the charging control unit 28 activates one of the battery chargers 21 by determining the external power source 2 to be used when charging the battery 23, and the connection relation between the battery charger 21 and the battery 23. The external power supply side connector 22 is operated so as to control. As a result, the charging control unit 28 causes the battery charger 21 and the external power supply side connector 22 to function as charging means.

  In addition, the charging control unit 28 determines the vehicle charger 26 connected to the electric vehicle 10 and the capacitor 23 to be used when charging the electric vehicle 10, and the connection relation between the vehicle charger 26 and the capacitor 23. The vehicle side connector 25 is operated so as to control. Accordingly, the charge control unit 28 causes the vehicle-side connector 25 and the vehicle charger 26 to function as discharging means by discharging the battery 23 with the vehicle charger 26.

  When determining the battery 23 to be used when charging the electric vehicle 10, the charging control unit 28 communicates with the electric vehicle 10 via the communication line, the vehicle charging connector 11, and the charger connector 3, thereby The SOC of the battery 12 is acquired, and the SOC of the battery 23 is acquired by a sensor signal from the battery 23. Based on the SOC of the vehicle battery 12 and the SOC of the battery 23, the charge control unit 28 selects the battery 23 to be discharged for use in charging the electric vehicle 10, and selects the battery 23 to be charged by external power. A capacitor selection process is performed. The contents of the capacitor selection process will be described later.

  Furthermore, the charge control unit 28 performs a charging process for discharging the battery 23 and charging the vehicle battery 12 of the electric vehicle 10 after selecting the battery 23 to be used by the battery selection process. The details of the charging process will be described later.

[Capacitor selection processing of charging stand 1]
Next, the flowchart of FIG. 2 and FIG. 3 about the processing procedure of the capacitor | condenser selection process which selects the capacitor | condenser 23 to discharge in order to charge the vehicle battery 12 of the electric vehicle 10 with the charging stand 1 comprised as mentioned above. Will be described with reference to FIG.

  As shown in FIG. 2, in this capacitor selection process, when the charger connector 3 and the vehicle charging connector 11 are first connected by the operator (step S1), it is determined that the connection has been established. 10 is detected by the in-vehicle charging control unit 10. Here, the charging control unit 28 and the in-vehicle charging control unit confirm the connector connection in response to the input of the detection signal indicating that the charger connector 3 and the vehicle charging connector 11 are connected (step S11). , Step S21).

  The in-vehicle charging control unit detects the SOC of the vehicle battery 12 in response to confirming the connector connection in step S11 and transmits it to the charging station 1 via the communication line (step S12). Then, a signal including the battery SOC is received from the in-vehicle charge control unit via the communication line (step S22).

  Next, in step S23, the charging control unit 28 determines whether or not the battery SOC received in step S22 is equal to or less than a predetermined capacity B (rapid chargeable capacity B) that can be charged for a short time. Here, the quick chargeable capacity B is a capacity set in advance depending on the type of the vehicle battery 12, and as shown in FIG. 4, the SOC of the vehicle battery 12 is high, and charging is performed from the charging station 1 with a large current. A capacity that cannot be performed is set in advance by experiments or the like. If the charge control unit 28 determines that the received battery SOC is not less than or equal to the quick chargeable capacity B, the charge control unit 28 advances the process to step S24 and sets the notification device 29 to display that charging is impossible. Control and end the process. On the other hand, if it is determined that the received battery SOC is less than or equal to the quick chargeable capacity B, the process proceeds to step S25.

  In step S25, the charging control unit 28 calculates a charging capacity A (necessary charging capacity A) necessary for charging the vehicle battery 12 from the current capacity, which is the received battery SOC, to the quick chargeable capacity B. . The required charging capacity A is set to increase as the battery SOC decreases. For example, the charge control unit 28 calculates the required charge capacity A by referring to map data describing the correspondence between the battery SOC and the SOC of the battery 23 as shown in FIG.

  Next, in step S <b> 26, the charging control unit 28 from the control state of the external power supply side connector 22 and the vehicle side connector 25 is charged with the external power from the external power supply 2 and the battery 23 and the vehicle battery 12 being charged. The battery 23 except for the battery 23 that is being charged to the vehicle battery 12 is being obtained, and a sensor signal from the capacity detector 24 corresponding to the battery 23 is detected. Among them, the battery 23 having the smallest charging capacity is selected.

  Next, when the charge control unit 28 determines in step S27 whether or not the capacity of the battery 23 selected in step S26 is less than the required charge capacity A, and determines that the capacity of the battery 23 is not less than the required charge capacity A. In step S28, the process proceeds. In this way, when the capacity of the battery 23 having the smallest capacity is greater than the required charge capacity A, excluding the battery 23 being charged and the battery 23 being discharged, the battery 23 causes the vehicle battery 12 to be It is determined that charging is performed, and the process proceeds to steps S28 to S30.

  In step S <b> 28, the charging control unit 28 displays, for example, “charging OK” on the alarm device 29. As a result, the operator of the electric vehicle 10 to which the connector is connected in step S1 is informed that the preparation for charging the vehicle battery 12 has been completed, and enters a standby state for prompting the operation of the charging operation switch 27. It will be in the state which transfers to the charge process demonstrated.

  Next, the charge control unit 28 is the battery 23 excluding the battery 23 selected to be used for charging the vehicle battery 12 and the battery 23 being discharged to the other vehicle battery 12 in step S29, and the required charge capacity A By controlling the external power supply side connector 22 and the battery charger 21 so as to connect the external battery 2 and the battery 23 for which charging described later has been interrupted to the external power supply 2, the battery 23 is charged. Start. In step S30, when the SOC of the battery 23 becomes 100%, the external power supply side connector 22 and the battery charger 21 are controlled so as to end the charging of the battery 23, and the process is ended.

  On the other hand, if it is determined in step S27 that the capacity of the battery 23 is less than the required charge capacity A, the process proceeds to step S31, and the charge control unit 28 determines whether the battery 23 selected in step S26 is lower than the lower limit capacity C. Determine whether or not. Here, as shown in FIG. 4, the lower limit capacity C is set to a low SOC value that may cause overdischarge by discharging the battery 23. When it is determined that the capacity is lower than the lower limit capacity C, charging is performed by controlling the external power supply side connector 22 and the battery charger 21 so as to connect the capacitor 23 having the lower limit capacity C or less and the external power supply 2. Is started (step S32), and when the SOC of the battery 23 reaches 100%, the external power supply side connector 22 and the battery charger 21 are controlled so as to end the charge of the battery 23, and the process is ended. (Step S33).

  In step S34 after determining that the capacity of the battery 23 is not less than or equal to the lower limit capacity C in step S31, the charge control unit 28 determines whether or not there is a battery 23 having the next largest capacity after the selected battery 23. judge. That is, whether or not there is a capacitor 23 that is not being charged or discharged and that has the smallest capacity among the capacitors 23 except for the selected capacitor 23 to be processed in step S27 and step S31. If it is determined that it does not exist, the process proceeds to step S36 in FIG. 3, and if it is determined that it exists, the battery 23 is selected in step S35, and the process returns to step S27.

  In this way, by repeating the processing after step S27, among the capacitors 23 that are not being charged or discharged, the capacitor 23 having a capacity larger than the lower limit capacity C and having the smallest capacity is used with the highest priority for charging the vehicle battery 12. Then, it is determined that the battery 23 having the capacity that is equal to or greater than the required charge capacity A and that has the smallest capacity is used for charging the vehicle battery 12, and further, the battery 23 having a capacity equal to or lower than the lower limit capacity C is charged.

  On the other hand, in step S36 of FIG. 3 in the case where it is determined in step S34 that there is no capacitor 23 to be selected next, that is, there is no capacitor 23 having a capacity equal to or greater than the required charge capacity A, the power from the external power source 2 is It is determined whether or not the battery 23 being charged exists. If it is determined that the battery 23 is present, the process proceeds to step S37. If it is determined that the battery 23 is not present, the process proceeds to step S45.

  In step S37, the charging control unit 28 inputs a sensor signal from the capacity detector 24 corresponding to the battery 23 being charged, selects the battery 23 having the maximum capacity among the batteries 23 being charged, and step S38. In step S39, the external power supply side connector 22 is controlled so as to stop the charging of the selected battery 23. In step S39, the external power supply side connector 22 disconnects the external power supply 2 and the battery 23.

  Next, the charging control unit 28 determines whether or not the capacity of the capacitor 23 selected in step S37 is equal to or greater than the lower limit capacity C. If it is determined that the capacity is not equal to or greater than the lower limit capacity C, all the charged capacitors 23 are charged. Since it is not equal to or lower than the lower limit capacity C, by controlling the alarm device 29 in step S41, for example, a message “cannot be charged” is displayed to notify that charging is impossible. Then, in step S42, the charging control unit 28 controls the external power supply side connector 22 to connect the capacitor 23 whose charging has been stopped in step S38 and the external power source 2, and in step S43, the capacitor When the SOC of 23 reaches 100%, the external power supply side connector 22 is controlled so as to terminate the charging, and the process is terminated.

  On the other hand, if the charge control unit 28 determines in step S40 that the capacity of the battery 23 selected in step S37 is greater than or equal to the lower limit capacity C, the capacity of the battery 23 needs to be calculated in step S25 in step S44. It is determined whether or not the charging capacity A is greater than or equal to, and if so, it is determined that the battery 23 is used for charging the vehicle battery 12, and the process proceeds to step S28. Otherwise, the process proceeds to step S45. To proceed.

  In step S45, the charge control unit 28 selects the capacitor 23 having the maximum capacity, which is the capacitor 23 excluding the capacitor 23 being discharged or being charged. This is because the process in step S45 is the process subsequent to step S36 or step S44, and the capacitor 23 that has started charging and ended in step S32 or the capacitor 23 that has been stopped in step S38 is reliably selected. It is a process to do.

  Next, in step S46, the charging control unit 28 determines whether or not the battery 23 is selected in step S45. If there is no battery 23 to be selected, the charging control unit 28 controls the alarm 29 in step S47, for example. The display of “cannot be charged” is performed to notify that charging is impossible, and the process is terminated. When there is a capacitor 23 to be selected, the process proceeds to step S48.

  In step S48, the charge control unit 28 refers to the map data shown in FIG. 4 from the SOC of the battery 23 selected in step S45 and the battery SOC received in step S22, and the SOC after charging the vehicle battery 12 Find the predicted value. Here, as indicated by “*” in FIG. 4, the map data stored in advance by the charging control unit 28 includes the SOC of the battery 23 when it is equal to or less than the required charging capacity A and the SOC of the vehicle battery 12. And the battery SOC predicted value after charging are stored in association with each other. Note that the battery SOC after being charged by the SOC capacitor 23 having an SOC equal to or less than the required charge capacity A is smaller than the quick chargeable capacity B, but the value is stored as the battery SOC predicted value.

  Next, in step S49, the charging control unit 28 controls the alarm device 29 so as to display the predicted battery SOC value obtained in step S48. As a result, the charging station 1 notifies the user of the electric vehicle 10 and the like that the quick chargeable capacity B is not reached even if the charging of the vehicle battery 12 is terminated by the currently usable battery 23, and the vehicle battery 12 It will be in the state which prompts operation of the charge operation switch 27 of whether to charge this. Note that the battery 23 in the case where the charging operation switch 27 is not operated and the battery 23 is not discharged is determined as the battery 23 whose charging is interrupted in the above-described step S29, and charging by the external power source 2 is performed.

  Next, in step S50, the charge control unit 28 is a battery 23 excluding the battery 23 selected in step S45 and the battery 23 being discharged to the vehicle battery 12 of the other electric vehicle 10, and the above-described battery selection The external power supply side connector 22 is controlled and charged so as to connect the capacitor 23 once selected in the process and the external power supply 2, and when the SOC of the capacitor 23 reaches 100% in step S51, the capacitor 23 is charged. The external power supply side connector 22 is controlled so as to terminate the process, and the process is terminated. That is, in step S48, the battery 23 that is not more than the required charge capacity A despite being selected in step S26 and step S35 is charged.

  The capacitor selection process has been described as being performed immediately after the charger connector 3 and the vehicle charging connector 11 are connected. However, after the display of “not chargeable” by the alarm device 29, for example, a predetermined value is used. By starting the processing after step S25 after the period, it is possible to select the battery 23 that has newly become the required charge capacity A or more by charging with external power. Further, after displaying the battery SOC prediction value in step S49, even if the operation of not performing charging with the charging operation switch 27 is performed, by starting the processing after step S25 after a predetermined period, It is also possible to select the battery 23 that has newly become the required charging capacity A or more by charging with electric power.

  Moreover, in this capacitor | condenser selection process, the charge control unit 28 can be functioned as a discrimination | determination means by performing the process of step S26, and a charge control unit is performed by performing the selection process used for charge of the vehicle battery 12. 28 can function as selection means.

[Charging process of charging stand 1]
Next, the charging process of the charging station 1 performed in a state where the battery 23 used for charging the vehicle battery 12 is selected in the above-described battery selecting process will be described with reference to the flowchart of FIG.

  The charging process is started after displaying “charging OK” in step S28 and “predicted battery SOC value after charging” on the indicator 29 in step S49.

  First, in step S101, the charging control unit 28 determines whether or not the time during which the charging operation switch 27 is not operated has elapsed after the display prompting the operation of the charging operation switch 27 in step S28 or step S49. If the predetermined time has elapsed, it is determined that the battery 23 is not discharged, and the process is terminated. If the predetermined time has not elapsed, whether or not the charging operation switch 27 has been operated in step S102 is determined. Determine. If the charging control unit 28 determines that the charging operation switch 27 is turned on within a predetermined time, the charging control unit 28 advances the process to step S103 in order to charge the vehicle battery 12 by the selected capacitor 23.

  In step S103, the charging control unit 28 transmits a charging start signal indicating that charging is to be started to the electric vehicle 10 via the communication line. When the charging start signal is received by the electric vehicle 10 in step S121, the charging control unit 28 receives step S122. In the vehicle charging control unit, the charging stand 1 and the vehicle battery 12 are controlled by controlling the high-voltage relay in the vehicle that switches connection / disconnection between the vehicle battery 12 and the power harness connected to the vehicle charging connector 11 to the on state. Is turned on. Next, in step S123, the in-vehicle charging control unit transmits to the charging stand 1 data including the required charging power and the battery voltage necessary for charging the SOC of the vehicle battery 12 to the quick chargeable capacity B.

  Next, when the charging control unit 28 receives the data including the required charging power and the battery voltage from the electric vehicle 10 in step S104, in step S105, the battery 23 selected in the capacitor selection process and the electric vehicle 10 are connected. The corresponding vehicle charger 26 is activated by turning on the relay of the vehicle-side connector 25 so that the vehicle charger 26 connected to the charger connector 3 is in a conductive state.

  Next, in step S106, the charging control unit 28 controls the voltage value while monitoring the current value of the power charged by the vehicle charger 26 activated in step S105 to the vehicle battery 12, and Check the integrated value of the charged energy. Thereby, the battery 23 is discharged and the vehicle battery 12 is charged with a predetermined current value.

  Here, the charging control unit 28 activates a counter (not shown) from the time when charging of the vehicle battery 12 is started in step S105, and a predetermined period (for example, 10 minutes) has elapsed from the start of charging based on the count value of the counter. It is determined whether or not (step S107). Further, at the same time as the determination in step S107, the charging control unit 28 receives, in step S108, a signal indicating that the locked state between the charger connector 3 and the vehicle charging connector 11 has been released within a predetermined period. Whether or not a vehicle abnormality signal is received from the in-vehicle charging control unit, whether or not a signal indicating abnormality of the battery 23 is received, and whether or not the battery voltage (charging voltage) of the vehicle battery 12 has reached the upper limit value. Determine. Further, at the same time as the determination in step S107, the charging control unit 28 determines whether or not a signal for ending the charging process is input by turning off the charging operation switch 27 (step S109).

  Then, the charging control unit 28 performs a process of ending the discharging of the battery 23 and ending the charging of the vehicle battery 12 when any of the conditions of Step S107, Step S108, and Step S109 is satisfied (Step S107). S110). At this time, the charging control unit 28 stops the vehicle charger 26 activated in step S105 and turns off the relay of the vehicle-side connector 25 that is on-controlled in step S105. Thereby, the battery 23 stops the discharge of the battery 23 which started the discharge in step S105.

  Next, in step S111, the charging control unit 28 transmits a charging end signal to the electric vehicle 10 in response to the completion of the operation in step S110, and the in-vehicle charging control unit receives the charging end signal in step S124. In response to this, in step S125, the relay that was turned on in step S122 is turned off.

  Next, the charging control unit 28 presents the alarm 29 indicating that the charging of the vehicle battery 12 has ended in accordance with the reason why the discharging of the battery 23 and the charging of the vehicle battery 12 have ended. At this time, when the charging control unit 28 ends the charging after the lapse of a predetermined period from the start of the charging of the vehicle battery 12, the charging control unit 28 displays a display “charging completed” indicating that the charging of the vehicle battery 12 is normally completed. When notifying the alarm device 29 (step S112), and when the charging operation switch 27 is turned off to terminate the charging, the alarm device 29 displays “charge interruption” (step S113). When the charging is terminated due to unlocking of the charger connector 3 or an abnormality on the charging stand 1 side or the electric vehicle 10 side, the display of “abnormal” is displayed on the alarm device 29 (step S114).

[Effect of the embodiment]
As described above in detail, according to the charging station 1 according to the first embodiment to which the present invention is applied, when selecting the capacitor 23 to be used for charging the vehicle battery 12 among the plurality of capacitors 23, As described above, since the battery 23 having the smallest charge capacity is selected from the battery 23 except for the battery 23 being charged and the battery being discharged, the new electric vehicle 10 is charged during the discharge to the other electric vehicle 10. When connected to the capacitor connector 3, it is possible to avoid a situation in which there is no capacitor 23 having a large capacity.

  Further, according to the charging station 1, when the charging capacity of the capacitor 23 selected in step S26 or step S35 is detected and the charging capacity of the selected capacitor 23 is less than the required charging capacity A, Since the capacitor 23 having the smallest charge capacity is selected from the capacitors 23 excluding the capacitor 23 having a capacity less than the required charge capacity A as in step S34, the capacity having the largest capacity among the capacitors 23 having a capacity equal to or greater than the required charge capacity A is selected. It is possible to select a small number of capacitors 23, efficiently charge using the charging power of the capacitors 23, and perform charging after the discharge of the capacitors 23 is completed.

  Furthermore, according to this charging stand 1, when the charge capacity of the capacitor selected in step S26 or step S35 is less than the lower limit capacity C as in steps S31 and S32, the capacitor 23 is connected to the external power supply. Therefore, it is possible to reliably prevent the capacitor 23 from being overdischarged.

  Furthermore, according to this charging stand 1, when there is no capacitor 23 to be selected in step S34, the process proceeds to step S36 and subsequent steps, and the charging capacity is the largest among the capacitors 23 being charged by external power. Since the battery 23 is selected and the charging of the battery 23 being charged is stopped and discharged to the vehicle battery 12, even when the battery 23 having a capacity greater than the required charge capacity A does not exist, The battery 23 can be selected, and the situation where the discharge to the other electric vehicle 10 cannot be performed can be avoided.

  Furthermore, according to the charging stand 1, when the charging capacity of the capacitor 23 that has been stopped charging is less than the lower limit capacity C as in steps S40 to S43, the charging of the capacitor 23 is resumed. Thus, the overdischarge of the battery 23 can be surely prevented.

  Furthermore, according to this charging stand 1, when the charging capacity of all the capacitors 23 is less than the required charging capacity A, as in the case of shifting to step S45, the capacitor 23 having the largest charging capacity is selected. Therefore, even when the vehicle battery 12 cannot be charged to the quick chargeable capacity B, it is possible to avoid a situation in which the vehicle battery 12 cannot be charged at all.

  Furthermore, according to the charging station 1, when the battery 23 is once selected and another battery 23 is selected and charged as in step S50, the vehicle is not necessary for the charging capacity A. Since the battery 23 that has not been selected for charging the battery 12 is charged, charging can be performed with priority from the battery 23 that has not been selected because the capacity is small.

  Furthermore, according to the charging station 1, when the battery 23 having a capacity equal to or greater than the required charging capacity A is selected as in step S28, the vehicle battery 12 is informed that charging is possible. It can be shown that 12 can be charged to the fast chargeable capacity B.

  Furthermore, according to this charging stand 1, when there is no battery 23 to be selected as in the case where the process proceeds from step S46 to step S47, the vehicle battery 12 is informed that charging is not possible. This can be presented to the user.

  Furthermore, according to this charging stand 1, when the battery 23 having a charge capacity less than the required charging capacity A is selected in step S45, the battery when the vehicle battery 12 is charged from the battery 23 as in step S49. Since the predicted SOC value is notified, charging of the vehicle battery 12 can be promoted even when the capacity of the vehicle battery 12 does not reach the quick chargeable capacity B.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

It is a block diagram which shows the structure of the charging stand to which this invention is applied. It is a flowchart which shows the process sequence of the capacitor | condenser selection process of the charging stand to which this invention is applied. It is a flowchart which shows the process sequence of the capacitor | condenser selection process of the charging stand to which this invention is applied. It is a figure which shows the required charge capacity | capacitance based on the relationship between SOC of an electrical storage device, and SOC of a vehicle battery, and the estimated battery SOC after vehicle battery charge. It is a flowchart which shows the process sequence of the charging process of the charging stand to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Charging stand 2 External power supply 3 Charger connector 11 Vehicle charging connector 12 Vehicle battery 21 Battery charger charger 22 External power supply side connector 23 Battery charger 24 Capacity detector 25 Vehicle side connector 26 Vehicle charger 27 Charging operation switch 28 Charging Control unit 29 Alarm

Claims (12)

In the charging station that charges the vehicle battery mounted on the electric vehicle,
A plurality of capacitors that are charged by external power and that discharge the charged power to charge the vehicle battery;
Charging capacity detection means for detecting a charging capacity charged in the battery;
Charging means for charging the battery with the external power;
Discharging means for discharging the capacitor and supplying the vehicle battery;
Discriminating means for discriminating a capacitor excluding a capacitor being charged by the external power and a capacitor being discharged to the vehicle battery;
A selection unit that selects a capacitor having the smallest charge capacity detected by the charge capacity detection unit among the capacitors determined by the determination unit;
Control means for controlling the charging means and discharging means to control charging of the battery and discharging of the battery by the external power;
The control means connects the vehicle battery and a battery selected by the selection means, and controls the discharge means to discharge the battery and charge the vehicle battery. Charging stand. The charge capacity detection means detects the charge capacity of the battery selected by the selection means,
When the charging capacity of the battery detected by the charging capacity detection means is less than a predetermined capacity, the selection means is a battery excluding the battery having a capacity less than the predetermined capacity, and is determined by the determination means. 2. The charging stand according to claim 1, wherein a storage battery having the smallest charging capacity is selected.   The charging stand according to claim 2, wherein the predetermined capacity is a charging capacity necessary for charging the vehicle battery to a predetermined capacity. The charge capacity detection means detects the charge capacity of the battery selected by the selection means,
The control means controls the charging means to charge the battery with the external power when the charge capacity of the battery detected by the charge capacity detection means is less than a predetermined capacity. The charging stand according to claim 1.   The charging stand according to claim 4, wherein the predetermined capacity is a lower limit capacity at which the battery is overdischarged. The selection means, when there is no capacitor to be selected, selects a capacitor having the largest charge capacity detected by the charge capacity detection means from among the batteries being charged by the external power,
The control means controls the charging means to stop the charging of the capacitor being charged selected by the selection means, and controls the discharging means to discharge the capacitor whose charging is stopped. The charging stand according to any one of claims 1 to 5, characterized in that:   The control means controls the charging means so that charging of the battery is resumed when the charge capacity of the battery whose charging is stopped is less than a lower limit capacity at which the battery is overdischarged. The charging stand according to claim 6.   The selecting unit is configured such that, among the charging capacitors, the capacitor having the largest charging capacity detected by the charging capacity detecting unit is less than a charging capacity necessary for charging the vehicle battery to a predetermined capacity. 7. The charging stand according to claim 6, wherein a storage battery having the largest charging capacity is selected from the storage batteries excluding the charging battery and the discharging battery.   The control means controls the charging means so as to charge a battery that has been selected by the selection means and has not been used for charging the vehicle battery due to a small charge capacity. The charging stand according to claim 2, claim 3, or claim 7.   The charging stand according to claim 1, further comprising notification means for notifying that the vehicle battery can be charged when a battery is selected by the selection means.   The charging stand according to claim 1, further comprising notification means for notifying that the vehicle battery cannot be charged when there is no battery to be selected by the selection means. When a storage device having a charging capacity lower than that required for charging the vehicle battery to a predetermined capacity is selected by the selection means, the charging capacity of the vehicle battery when charging the vehicle battery from the storage battery is determined. The charging station according to claim 8, further comprising an informing unit for informing.

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